<?php
/* For licensing terms, see /license.txt */
/**
 * Exercise library
 * @todo convert this lib into a static class
 *
 * shows a question and its answers
 * @package chamilo.exercise
 * @author Olivier Brouckaert <oli.brouckaert@skynet.be>
 * @version $Id: exercise.lib.php 22247 2009-07-20 15:57:25Z ivantcholakov $
 * Modified by Hubert Borderiou 2011-10-21 Question Category
 */
/**
 * Code
 */
// The initialization class for the online editor is needed here.
require_once dirname(__FILE__).'/../inc/lib/fckeditor/fckeditor.php';

/**
 * Shows a question
 *
 * @param int   question id
 * @param bool  if true only show the questions, no exercise title
 * @param bool  origin i.e = learnpath
 * @param int   current item from the list of questions
 * @param int   number of total questions
 * */
function showQuestion($questionId, $only_questions = false, $origin = false, $current_item = '', $show_title = true, $freeze = false, $user_choice = array(), $show_comment = false, $exercise_feedback = null, $show_answers = false) {

    // Text direction for the current language
    $is_ltr_text_direction = api_get_text_direction() != 'rtl';

    // Change false to true in the following line to enable answer hinting
    $debug_mark_answer = $show_answers; //api_is_allowed_to_edit() && false;

    // Reads question information
    if (!$objQuestionTmp = Question::read($questionId)) {
    	// Question not found
    	return false;
    }

    if ($exercise_feedback != EXERCISE_FEEDBACK_TYPE_END) {
        $show_comment = false;
    }

    $answerType    = $objQuestionTmp->selectType();
    $pictureName   = $objQuestionTmp->selectPicture();
    $s = '';

    if ($answerType != HOT_SPOT && $answerType != HOT_SPOT_DELINEATION) {
    	// Question is not a hotspot

    	if (!$only_questions) {
    		$questionDescription = $objQuestionTmp->selectDescription();
    		if ($show_title) {
    			Testcategory::displayCategoryAndTitle($objQuestionTmp->id);	//
    			echo Display::div($current_item.'. '.$objQuestionTmp->selectTitle(), array('class'=>'question_title'));
    		}
    		if (!empty($questionDescription)) {
                echo Display::div($questionDescription, array('class'=>'question_description'));
            }
        }

        if (in_array($answerType, array(FREE_ANSWER, ORAL_EXPRESSION)) && $freeze) {
            return '';
        }

        echo '<div class="question_options">';
    	// construction of the Answer object (also gets all answers details)
    	$objAnswerTmp = new Answer($questionId);

    	$nbrAnswers     = $objAnswerTmp->selectNbrAnswers();
        $course_id      = api_get_course_int_id();
        $quiz_question_options = Question::readQuestionOption($questionId, $course_id);

    	// For "matching" type here, we need something a little bit special
    	// because the match between the suggestions and the answers cannot be
    	// done easily (suggestions and answers are in the same table), so we
    	// have to go through answers first (elems with "correct" value to 0).
    	$select_items = array();
    	//This will contain the number of answers on the left side. We call them
    	// suggestions here, for the sake of comprehensions, while the ones
    	// on the right side are called answers
    	$num_suggestions = 0;

    	if ($answerType == MATCHING) {
            $s .= '<table class="data_table">';
            // Iterate through answers
    		$x = 1;
            //mark letters for each answer
    		$letter = 'A';
    		$answer_matching = array();
            $cpt1 = array();
            for ($answerId = 1; $answerId <= $nbrAnswers; $answerId++) {
                $answerCorrect = $objAnswerTmp->isCorrect($answerId);
                $numAnswer = $objAnswerTmp->selectAutoId($answerId);

                $answer = $objAnswerTmp->selectAnswer($answerId);
                if ($answerCorrect == 0) {
                    // options (A, B, C, ...) that will be put into the list-box
                    // have the "correct" field set to 0 because they are answer
                    $cpt1[$x] = $letter;
    				$answer_matching[$x] = $objAnswerTmp->selectAnswerByAutoId($numAnswer);
                    $x++;
                    $letter++;
                }
            }

            $i = 1;

            $select_items[0]['id'] = 0;
            $select_items[0]['letter'] = '--';
            $select_items[0]['answer'] = '';
            foreach ($answer_matching as $id => $value) {
                $select_items[$i]['id'] 	= $value['id'];
                $select_items[$i]['letter'] = $cpt1[$id];
                $select_items[$i]['answer'] = $value['answer'];
                $i++;
            }

            $user_choice_array_position = array();
            if (!empty($user_choice)) {
                foreach ($user_choice as $item) {
                    $user_choice_array_position[$item['position']] = $item['answer'];
                }
            }

    		$num_suggestions = ($nbrAnswers - $x) + 1;

    	} elseif ($answerType == FREE_ANSWER) {
    		$fck_content = isset($user_choice[0]) && !empty($user_choice[0]['answer']) ? $user_choice[0]['answer']:null;

    		$oFCKeditor = new FCKeditor("choice[".$questionId."]") ;

    		$oFCKeditor->ToolbarSet = 'TestFreeAnswer';
    		$oFCKeditor->Width      = '100%';
    		$oFCKeditor->Height     = '200';
    		$oFCKeditor->Value      = $fck_content;
            $s .= $oFCKeditor->CreateHtml();
    	} elseif ($answerType == ORAL_EXPRESSION) {
    		//Add nanog
    		if (api_get_setting('enable_nanogong') == 'true') {
    			require_once api_get_path(LIBRARY_PATH).'nanogong.lib.php';
    			//@todo pass this as a parameter
    			global $exercise_stat_info, $exerciseId, $exe_id;

    			if (!empty($exercise_stat_info)) {
    				$params = array(
    					'exercise_id' 	=> $exercise_stat_info['exe_exo_id'],
    					'exe_id' 		=> $exercise_stat_info['exe_id'],
    					'question_id'   => $questionId
    				);
    			} else {
    				$params = array(
    					'exercise_id' 	=> $exerciseId,
    					'exe_id' 		=> 'temp_exe',
    					'question_id'   => $questionId
    				);
    			}
    			$nano = new Nanogong($params);
    			echo $nano->show_button();
    		}

    		$oFCKeditor = new FCKeditor("choice[".$questionId."]") ;
    		$oFCKeditor->ToolbarSet = 'TestFreeAnswer';
    		$oFCKeditor->Width  = '100%';
    		$oFCKeditor->Height = '150';
    		$oFCKeditor->ToolbarStartExpanded = false;
    		$oFCKeditor->Value	= '' ;
    		$s .= $oFCKeditor->CreateHtml();
    	}

    	// Now navigate through the possible answers, using the max number of
    	// answers for the question as a limiter
    	$lines_count = 1; // a counter for matching-type answers

        if ($answerType == MULTIPLE_ANSWER_TRUE_FALSE || $answerType ==  MULTIPLE_ANSWER_COMBINATION_TRUE_FALSE) {
            $header = Display::tag('th', get_lang('Options'));
            foreach ($objQuestionTmp->options as $item) {
                if ($answerType == MULTIPLE_ANSWER_TRUE_FALSE) {
                    if (in_array($item, $objQuestionTmp->options)) {
                        $header .= Display::tag('th', get_lang($item));
                    } else {
                        $header .= Display::tag('th', $item);
                    }
                } else {
                    $header .= Display::tag('th', $item);
                }

            }
            if ($show_comment) {
                $header .= Display::tag('th', get_lang('Feedback'));
            }
            $s .= '<table class="data_table">';
            $s .= Display::tag('tr', $header, array('style'=>'text-align:left;'));
        }

        if ($show_comment) {
            if (in_array($answerType, array(MULTIPLE_ANSWER, MULTIPLE_ANSWER_COMBINATION, UNIQUE_ANSWER, UNIQUE_ANSWER_NO_OPTION, GLOBAL_MULTIPLE_ANSWER))) {
                $header = Display::tag('th', get_lang('Options'));
                if ($exercise_feedback == EXERCISE_FEEDBACK_TYPE_END) {
                    $header .= Display::tag('th', get_lang('Feedback'));
                }
                $s .= '<table class="data_table">';
                $s .= Display::tag('tr',$header, array('style'=>'text-align:left;'));
            }
        }

        $matching_correct_answer = 0;
        $user_choice_array = array();
        if (!empty($user_choice)) {
        	foreach($user_choice as $item) {
        		$user_choice_array[] = $item['answer'];
        	}
        }


    	for ($answerId=1; $answerId <= $nbrAnswers; $answerId++) {
    		$answer          = $objAnswerTmp->selectAnswer($answerId);
    		$answerCorrect   = $objAnswerTmp->isCorrect($answerId);
    		$numAnswer       = $objAnswerTmp->selectAutoId($answerId);
            $comment         = $objAnswerTmp->selectComment($answerId);

            $attributes = array();

    		// Unique answer
    		if ($answerType == UNIQUE_ANSWER || $answerType == UNIQUE_ANSWER_NO_OPTION) {
    			$input_id = 'choice-'.$questionId.'-'.$answerId;
    			if (isset($user_choice[0]['answer']) && $user_choice[0]['answer'] == $numAnswer ) {
    				$attributes = array('id' =>$input_id, 'checked'=>1, 'selected'=>1);
    			} else {
    				$attributes = array('id' =>$input_id);
    			}

                if ($debug_mark_answer) {
    				if ($answerCorrect) {
    					$attributes['checked'] = 1;
                        $attributes['selected'] = 1;
    				}
    			}

    			$answer = Security::remove_XSS($answer, STUDENT);

    			$s .= Display::input('hidden','choice2['.$questionId.']','0');

    			$answer_input = '<label class="radio">';
    			$answer_input .= Display::input('radio', 'choice['.$questionId.']', $numAnswer, $attributes);
    			$answer_input .= $answer;
    			$answer_input .= '</label>';

                if ($show_comment) {
                    $s .= '<tr><td>';
                    $s .= $answer_input;
                    $s .= '</td>';
                    $s .= '<td>';
                    $s .= $comment;
                    $s .= '</td>';
                    $s .= '</tr>';
                } else {
                    $s .= $answer_input;
                }

    		} elseif ($answerType == MULTIPLE_ANSWER || $answerType == MULTIPLE_ANSWER_TRUE_FALSE || $answerType == GLOBAL_MULTIPLE_ANSWER) {
    			$input_id = 'choice-'.$questionId.'-'.$answerId;
    			$answer = Security::remove_XSS($answer, STUDENT);

    			if (in_array($numAnswer, $user_choice_array)) {
    				$attributes = array('id' =>$input_id, 'checked'=>1, 'selected'=>1);
    			} else {
    				$attributes = array('id' =>$input_id);
    			}

                if ($debug_mark_answer) {
    				if ($answerCorrect) {
    					$attributes['checked'] = 1;
                        $attributes['selected'] = 1;
    				}
    			}

                if ($answerType == MULTIPLE_ANSWER || $answerType == GLOBAL_MULTIPLE_ANSWER) {
                    $s .= '<input type="hidden" name="choice2['.$questionId.']" value="0" />';

                    $answer_input = '<label class="checkbox">';
                    $answer_input .= Display::input('checkbox', 'choice['.$questionId.']['.$numAnswer.']', $numAnswer, $attributes);
                    $answer_input .= $answer;
                    $answer_input .= '</label>';

                    if ($show_comment) {
                        $s .= '<tr><td>';
                        $s .= $answer_input;
                        $s .= '</td>';
                        $s .= '<td>';
                        $s .= $comment;
                        $s .= '</td>';
                        $s .='</tr>';
                    } else {
                        $s .= $answer_input;
                    }
                } elseif ($answerType == MULTIPLE_ANSWER_TRUE_FALSE) {

                	$my_choice = array();
                    if (!empty($user_choice_array)) {
                        foreach ($user_choice_array as $item) {
                            $item = explode(':', $item);
                            $my_choice[$item[0]] = $item[1];
                        }
                    }

                    $s .= '<tr>';
                    $s .= Display::tag('td', $answer);

                    if (!empty($quiz_question_options)) {
                    	foreach ($quiz_question_options as $id => $item) {

                    		if (isset($my_choice[$numAnswer]) && $id == $my_choice[$numAnswer]) {
                    			$attributes = array('checked'=>1, 'selected'=>1);
                    		} else {
                    			$attributes = array();
                    		}

                            if ($debug_mark_answer) {
                                if ($id == $answerCorrect) {
                                    $attributes['checked'] = 1;
                                    $attributes['selected'] = 1;
                                }
                            }
                    		$s .= Display::tag('td', Display::input('radio', 'choice['.$questionId.']['.$numAnswer.']', $id, $attributes), array('style'=>''));
                    	}
                    }

                    if ($show_comment) {
                        $s .= '<td>';
                        $s .= $comment;
                        $s .= '</td>';
                    }
                    $s.='</tr>';
                }
    		} elseif ($answerType == MULTIPLE_ANSWER_COMBINATION) {
    			// multiple answers
    			$input_id = 'choice-'.$questionId.'-'.$answerId;

    			if (in_array($numAnswer, $user_choice_array)) {
    			    $attributes = array('id'=>$input_id, 'checked'=>1, 'selected'=>1);
    			} else {
    			    $attributes = array('id'=>$input_id);
    			}

                if ($debug_mark_answer) {
    				if ($answerCorrect) {
    					$attributes['checked'] = 1;
                        $attributes['selected'] = 1;
    				}
    			}

    			$answer = Security::remove_XSS($answer, STUDENT);
    			$answer_input = '<input type="hidden" name="choice2['.$questionId.']" value="0" />';
    			$answer_input .= '<label class="checkbox">';
    			$answer_input .= Display::input('checkbox', 'choice['.$questionId.']['.$numAnswer.']', 1, $attributes);
    		    $answer_input .= $answer;
                $answer_input .= '</label>';

                if ($show_comment) {
                    $s .= '<tr>';
                    $s .= '<td>';
                    $s .= $answer_input;
                    $s .= '</td>';
                    $s .= '<td>';
                    $s .= $comment;
                    $s .= '</td>';
                    $s .= '</tr>';
                } else {
                    $s .= $answer_input;
                }

            } elseif ($answerType == MULTIPLE_ANSWER_COMBINATION_TRUE_FALSE) {
            	$s .= '<input type="hidden" name="choice2['.$questionId.']" value="0" />';

            	$my_choice = array();
            	if (!empty($user_choice_array)) {
            		foreach ($user_choice_array as $item) {
            			$item = explode(':', $item);
            			$my_choice[$item[0]] = $item[1];
            		}
            	}
            	$answer = Security::remove_XSS($answer, STUDENT);
            	$s .='<tr>';
            	$s .= Display::tag('td', $answer);

            	foreach ($objQuestionTmp->options as $key => $item) {
            		if (isset($my_choice[$numAnswer]) && $key == $my_choice[$numAnswer]) {
            			$attributes = array('checked' => 1, 'selected' => 1);
            		} else {
            			$attributes = array();
            		}

                    if ($debug_mark_answer) {
                        if ($key == $answerCorrect) {
                            $attributes['checked']  = 1;
                            $attributes['selected'] = 1;
                        }
                    }
            		$s .= Display::tag('td', Display::input('radio', 'choice['.$questionId.']['.$numAnswer.']', $key, $attributes));
            	}

                if ($show_comment) {
                    $s .= '<td>';
                    $s .= $comment;
                    $s .= '</td>';
                }
            	$s .='</tr>';

    		} elseif ($answerType == FILL_IN_BLANKS) {
                /*
                 * In the FILL_IN_BLANKS test
                 * you mustn't have [ and ] in the textarea
                 * you mustn't have :: in the textarea
                 * the text to find mustn't be empty or contains only spaces
                 * the text to find mustn't contains HTML tags
                 * the text to find mustn't contains char "
                 */

    			list($answer) = explode('::', $answer);

                // $correct_answer_list array of array with correct anwsers 0=> [0=>[\p] 1=>[plop]]
    			api_preg_match_all('/\[[^]]+\]/', $answer, $correct_answer_list);

                // get student answer to display it if student go back to previous fillBlank answer question in a test
    			if (isset($user_choice[0]['answer'])) {
    				api_preg_match_all('/\[[^]]+\]/', $user_choice[0]['answer'], $student_answer_list);
                    $student_answer_list_tobecleaned = $student_answer_list[0];
                    $student_answer_list = array();
                    // here we got the student answer in a test
                    // let's clean up the results
                    /*
                    Array
                    (
                        [0] => Array
                        (
                            [0] => [<font color="red"><s>yer</s></font> / <font color="green"><b>ici</b></font>]
                            [1] => [<font color="red"><s>plop</s></font> / <font color="green"><b>/p</b></font>]
                        )
                    )
                    */
                    for ($i=0; $i < count($student_answer_list_tobecleaned); $i++) {
                        $answer_corrected = $student_answer_list_tobecleaned[$i];
                        /*
                         * we got if student answer is wrong
                         * [<font color="red"><s>rrr</s></font> / <font color="green"><b>/p</b></font>]
                         * or if student answer is good
                         * [plop / <font color="green"><b>plop</b></font>]
                         * or if student didn't answer []
                         */
                        $answer_corrected = api_preg_replace('| / <font color="green"><b>.*$|', '', $answer_corrected);
                        /*
                         * we got [<font color="red"><s>rrr</s></font> or [plop or [
                         */
                        $answer_corrected = api_preg_replace('/^\[/', '', $answer_corrected);
                        /*
                         * we got <font color="red"><s>rrr</s></font> or plop
                         * non breakable spaces &nbsp;&nbsp;&nbsp; from /main/exercice/exercise.class.php have been removed l 2391 and l 2370
                         */
                        $answer_corrected = api_preg_replace('|^<font color="red"><s>|', '', $answer_corrected);
                        $answer_corrected = api_preg_replace('|</s></font>$|', '', $answer_corrected);
                        $answer_corrected = '['.$answer_corrected.']';
                        /*
                         * we got [rrr] or [plop] or []
                         */
                        $student_answer_list[] = $answer_corrected;
                    }
    			}

                // If display preview of answer in test view for exemple, set the student answer to the correct answers
                if ($debug_mark_answer) {
                    // contain the rights answers surronded with brackets
    				$student_answer_list = $correct_answer_list[0];
                }

                // Split the response by bracket
                // tab_comments is an array with text surrounding the text to find
                // we add a space before and after the answer_question to be sure to have a block of text before and after [xxx] patterns
                // so we have n text to find ([xxx]) and n+1 blockc of texts before, beteween and after the text to find
                $tab_comments = api_preg_split('/\[[^]]+\]/', ' '.$answer.' ');

                if (!empty($correct_answer_list) && !empty($student_answer_list)) {
                    $answer = "";
                    $i = 0;
                    foreach ($student_answer_list as $student_item) {
                        $student_response = api_substr($student_item, 1, api_strlen($student_item) - 2);  // remove surronding brackets
                        $answer .= $tab_comments[$i].Display::input('text', "choice[$questionId][]", $student_response);
                        $i++;
                    }
                    $answer .= $tab_comments[$i];
                } else {
                    // display exercice with empty input fields
                    // every [xxx] are replaced with an empty input field
                    $answer = api_preg_replace('/\[[^]]+\]/', Display::input('text', "choice[$questionId][]", '', $attributes), $answer);
                }
    			$s .= $answer;

            } elseif ($answerType == MATCHING) {
    			// matching type, showing suggestions and answers
    			// TODO: replace $answerId by $numAnswer

    			if ($answerCorrect != 0) {
    				// only show elements to be answered (not the contents of
    				// the select boxes, who are corrrect = 0)
    				$s .= '<tr><td width="45%" valign="top">';
    				$parsed_answer = $answer;
    				//left part questions
    				$s .= ' <span style="float:left; width:8%;"><b>'.$lines_count.'</b>.&nbsp;</span>
    					 	<span style="float:left; width:92%;">'.$parsed_answer.'</span></td>';
    				//middle part (matches selects)

    				$s .= '<td width="10%" valign="top" align="center">&nbsp;&nbsp;
    			            <select name="choice['.$questionId.']['.$numAnswer.']">';

    				// fills the list-box
    				foreach ($select_items as $key => $val) {
    					// set $debug_mark_answer to true at function start to
    					// show the correct answer with a suffix '-x'
    					$selected = '';
    					if ($debug_mark_answer) {
    						if ($val['id'] == $answerCorrect) {
    							$selected = 'selected="selected"';
    						}
    					}
                        //$user_choice_array_position
                        if (isset($user_choice_array_position[$numAnswer]) && $val['id'] == $user_choice_array_position[$numAnswer]) {
    					    $selected = 'selected="selected"';
    					}
    					/*if (isset($user_choice_array[$matching_correct_answer]) && $val['id'] == $user_choice_array[$matching_correct_answer]['answer']) {
    					    $selected = 'selected="selected"';
    					}*/
    					$s .= '<option value="'.$val['id'].'" '.$selected.'>'.$val['letter'].'</option>';

    				}  // end foreach()

    				$s .= '</select></td>';
    				$s .='<td width="45%" valign="top" >';
    				if (isset($select_items[$lines_count])) {
    					$s.='<span style="float:left; width:5%;"><b>'.$select_items[$lines_count]['letter'].'.</b></span>'.
    						 '<span style="float:left; width:95%;">'.$select_items[$lines_count]['answer'].'</span>';
    				} else {
    					$s.='&nbsp;';
    				}
    				$s .= '</td>';
    				$s .= '</tr>';
    				$lines_count++;
    				//if the left side of the "matching" has been completely
    				// shown but the right side still has values to show...
    				if (($lines_count -1) == $num_suggestions) {
    					// if it remains answers to shown at the right side
    					while (isset($select_items[$lines_count])) {
    						$s .= '<tr>
    							  <td colspan="2"></td>
    							  <td valign="top">';
    						$s .='<b>'.$select_items[$lines_count]['letter'].'.</b> '.$select_items[$lines_count]['answer'];
    						$s .="</td>
    						</tr>";
    						$lines_count++;
    					}	// end while()
    				}  // end if()
    				$matching_correct_answer++;
    			}
    		}
    	}	// end for()

        if ($show_comment) {
            $s .= '</table>';
        } else {
            if ($answerType == MATCHING || $answerType == UNIQUE_ANSWER_NO_OPTION || $answerType == MULTIPLE_ANSWER_TRUE_FALSE ||
                $answerType == MULTIPLE_ANSWER_COMBINATION_TRUE_FALSE) {
                $s .= '</table>';
            }
        }

    	$s .= '</div>';

    	// destruction of the Answer object
    	unset($objAnswerTmp);

    	// destruction of the Question object
    	unset($objQuestionTmp);

    	if ($origin != 'export') {
    		echo $s;
    	} else {
    		return $s;
    	}
    } elseif ($answerType == HOT_SPOT || $answerType == HOT_SPOT_DELINEATION) {
    	// Question is a HOT_SPOT
        //checking document/images visibility
        if (api_is_platform_admin() || api_is_course_admin()) {
            require_once api_get_path(LIBRARY_PATH).'document.lib.php';
            $course = api_get_course_info();
            $doc_id = DocumentManager::get_document_id($course, '/images/'.$pictureName);
            if (is_numeric($doc_id)) {
                $images_folder_visibility = api_get_item_visibility($course,'document', $doc_id, api_get_session_id());
                if (!$images_folder_visibility) {
                    //This message is shown only to the course/platform admin if the image is set to visibility = false
                    Display::display_warning_message(get_lang('ChangeTheVisibilityOfTheCurrentImage'));
                }
            }
        }
    	$questionName         = $objQuestionTmp->selectTitle();
    	$questionDescription  = $objQuestionTmp->selectDescription();

        if ($freeze) {
            echo Display::img($objQuestionTmp->selectPicturePath());
            return;
        }

    	// Get the answers, make a list
    	$objAnswerTmp         = new Answer($questionId);
    	$nbrAnswers           = $objAnswerTmp->selectNbrAnswers();

    	// get answers of hotpost
    	$answers_hotspot = array();
    	for ($answerId=1;$answerId <= $nbrAnswers;$answerId++) {
    		$answers = $objAnswerTmp->selectAnswerByAutoId($objAnswerTmp->selectAutoId($answerId));
    		$answers_hotspot[$answers['id']] = $objAnswerTmp->selectAnswer($answerId);
    	}

    	// display answers of hotpost order by id
    	$answer_list = '<div style="padding: 10px; margin-left: 0px; border: 1px solid #A4A4A4; height: 408px; width: 200px;"><b>'.get_lang('HotspotZones').'</b><dl>';
    	if (!empty($answers_hotspot)) {
    		ksort($answers_hotspot);
    		foreach ($answers_hotspot as $key => $value) {
    			$answer_list .= '<dt>'.$key.'.- '.$value.'</dt><br />';
    		}
    	}
    	$answer_list .= '</dl></div>';

    	if ($answerType == HOT_SPOT_DELINEATION) {
    		$answer_list='';
    		$swf_file = 'hotspot_delineation_user';
    		$swf_height = 405;
    	} else {
    		$swf_file = 'hotspot_user';
    		$swf_height = 436;
    	}

    	if (!$only_questions) {
            if ($show_title) {
    			Testcategory::displayCategoryAndTitle($objQuestionTmp->id);
                echo '<div class="question_title">'.$current_item.'. '.$questionName.'</div>';
            }
    		//@todo I need to the get the feedback type
    		echo '<input type="hidden" name="hidden_hotspot_id" value="'.$questionId.'" />';
    		echo '<table class="exercise_questions" >
    			  <tr>
    		  		<td valign="top" colspan="2">';
    		echo $questionDescription;
    		echo '</td></tr>';
    	}

    	$canClick = isset($_GET['editQuestion']) ? '0' : (isset($_GET['modifyAnswers']) ? '0' : '1');

    	$s .= '<script type="text/javascript" src="../plugin/hotspot/JavaScriptFlashGateway.js"></script>
    					<script src="../plugin/hotspot/hotspot.js" type="text/javascript" ></script>
    					<script type="text/javascript">
    					<!--
    					// Globals
    					// Major version of Flash required
    					var requiredMajorVersion = 7;
    					// Minor version of Flash required
    					var requiredMinorVersion = 0;
    					// Minor version of Flash required
    					var requiredRevision = 0;
    					// the version of javascript supported
    					var jsVersion = 1.0;
    					// -->
    					</script>
    					<script language="VBScript" type="text/vbscript">
    					<!-- // Visual basic helper required to detect Flash Player ActiveX control version information
    					Function VBGetSwfVer(i)
    					  on error resume next
    					  Dim swControl, swVersion
    					  swVersion = 0

    					  set swControl = CreateObject("ShockwaveFlash.ShockwaveFlash." + CStr(i))
    					  if (IsObject(swControl)) then
    					    swVersion = swControl.GetVariable("$version")
    					  end if
    					  VBGetSwfVer = swVersion
    					End Function
    					// -->
    					</script>

    					<script language="JavaScript1.1" type="text/javascript">
    					<!-- // Detect Client Browser type
    					var isIE  = (navigator.appVersion.indexOf("MSIE") != -1) ? true : false;
    					var isWin = (navigator.appVersion.toLowerCase().indexOf("win") != -1) ? true : false;
    					var isOpera = (navigator.userAgent.indexOf("Opera") != -1) ? true : false;
    					jsVersion = 1.1;
    					// JavaScript helper required to detect Flash Player PlugIn version information
    					function JSGetSwfVer(i) {
    						// NS/Opera version >= 3 check for Flash plugin in plugin array
    						if (navigator.plugins != null && navigator.plugins.length > 0) {
    							if (navigator.plugins["Shockwave Flash 2.0"] || navigator.plugins["Shockwave Flash"]) {
    								var swVer2 = navigator.plugins["Shockwave Flash 2.0"] ? " 2.0" : "";
    					      		var flashDescription = navigator.plugins["Shockwave Flash" + swVer2].description;
    								descArray = flashDescription.split(" ");
    								tempArrayMajor = descArray[2].split(".");
    								versionMajor = tempArrayMajor[0];
    								versionMinor = tempArrayMajor[1];
    								if ( descArray[3] != "" ) {
    									tempArrayMinor = descArray[3].split("r");
    								} else {
    									tempArrayMinor = descArray[4].split("r");
    								}
    					      		versionRevision = tempArrayMinor[1] > 0 ? tempArrayMinor[1] : 0;
    					            flashVer = versionMajor + "." + versionMinor + "." + versionRevision;
    					      	} else {
    								flashVer = -1;
    							}
    						}
    						// MSN/WebTV 2.6 supports Flash 4
    						else if (navigator.userAgent.toLowerCase().indexOf("webtv/2.6") != -1) flashVer = 4;
    						// WebTV 2.5 supports Flash 3
    						else if (navigator.userAgent.toLowerCase().indexOf("webtv/2.5") != -1) flashVer = 3;
    						// older WebTV supports Flash 2
    						else if (navigator.userAgent.toLowerCase().indexOf("webtv") != -1) flashVer = 2;
    						// Can\'t detect in all other cases
    						else
    						{
    							flashVer = -1;
    						}
    						return flashVer;
    					}
    					// When called with reqMajorVer, reqMinorVer, reqRevision returns true if that version or greater is available

    					function DetectFlashVer(reqMajorVer, reqMinorVer, reqRevision) {
    					 	reqVer = parseFloat(reqMajorVer + "." + reqRevision);
    					   	// loop backwards through the versions until we find the newest version
    						for (i=25;i>0;i--) {
    							if (isIE && isWin && !isOpera) {
    								versionStr = VBGetSwfVer(i);
    							} else {
    								versionStr = JSGetSwfVer(i);
    							}
    							if (versionStr == -1 ) {
    								return false;
    							} else if (versionStr != 0) {
    								if(isIE && isWin && !isOpera) {
    									tempArray         = versionStr.split(" ");
    									tempString        = tempArray[1];
    									versionArray      = tempString .split(",");
    								} else {
    									versionArray      = versionStr.split(".");
    								}
    								versionMajor      = versionArray[0];
    								versionMinor      = versionArray[1];
    								versionRevision   = versionArray[2];

    								versionString     = versionMajor + "." + versionRevision;   // 7.0r24 == 7.24
    								versionNum        = parseFloat(versionString);
    					        	// is the major.revision >= requested major.revision AND the minor version >= requested minor
    								if ( (versionMajor > reqMajorVer) && (versionNum >= reqVer) ) {
    									return true;
    								} else {
    									return ((versionNum >= reqVer && versionMinor >= reqMinorVer) ? true : false );
    								}
    							}
    						}
    					}
    					// -->
    					</script>';
    	$s .= '<tr><td valign="top" colspan="2" width="520"><table><tr><td width="520">
    				<script>
    					<!--
    					// Version check based upon the values entered above in "Globals"
    					var hasReqestedVersion = DetectFlashVer(requiredMajorVersion, requiredMinorVersion, requiredRevision);

    					// Check to see if the version meets the requirements for playback
    					if (hasReqestedVersion) {  // if we\'ve detected an acceptable version
    					    var oeTags = \'<object type="application/x-shockwave-flash" data="../plugin/hotspot/'.$swf_file.'.swf?modifyAnswers='.$questionId.'&amp;canClick:'.$canClick.'" width="600" height="'.$swf_height.'">\'
    					    			+ \'<param name="wmode" value="transparent">\'
    									+ \'<param name="movie" value="../plugin/hotspot/'.$swf_file.'.swf?modifyAnswers='.$questionId.'&amp;canClick:'.$canClick.'" />\'
    									+ \'<\/object>\';
    					    document.write(oeTags);   // embed the Flash Content SWF when all tests are passed
    					} else {  // flash is too old or we can\'t detect the plugin
    						var alternateContent = "Error<br \/>"
    							+ "Hotspots requires Macromedia Flash 7.<br \/>"
    							+ "<a href=\"http://www.macromedia.com/go/getflash/\">Get Flash<\/a>";
    						document.write(alternateContent);  // insert non-flash content
    					}
    					// -->
    				</script>
    				</td>
    				<td valign="top" align="left">'.$answer_list.'</td></tr>
    				</table>
    	</td></tr>';
    	echo $s;
        echo '</table>';
    }

    return $nbrAnswers;
}

function get_exercise_track_exercise_info($exe_id) {
    $TBL_EXERCICES         	= Database::get_course_table(TABLE_QUIZ_TEST);
    $TBL_TRACK_EXERCICES	= Database::get_statistic_table(TABLE_STATISTIC_TRACK_E_EXERCICES);
    $TBL_COURSE             = Database::get_main_table(TABLE_MAIN_COURSE);
    $exe_id = intval($exe_id);
    $result = array();
    if (!empty($exe_id)) {
       $sql_fb_type = "SELECT q.*, tee.*
                        FROM $TBL_EXERCICES as q
                        INNER JOIN $TBL_TRACK_EXERCICES as tee
                        ON q.id=tee.exe_exo_id
                        INNER JOIN $TBL_COURSE c
                        ON c.code = tee.exe_cours_id
                        WHERE tee.exe_id=$exe_id
                        AND q.c_id=c.id";

       $res_fb_type = Database::query($sql_fb_type);
       $result      = Database::fetch_array($res_fb_type, 'ASSOC');
    }
    return $result;
}


/**
 * Validates the time control key
 */
function exercise_time_control_is_valid($exercise_id, $lp_id = 0 , $lp_item_id = 0) {
    $course_id = api_get_course_int_id();
    $exercise_id = intval($exercise_id);
    $TBL_EXERCICES =  Database::get_course_table(TABLE_QUIZ_TEST);
    $sql 	= "SELECT expired_time FROM $TBL_EXERCICES WHERE c_id = $course_id AND id = $exercise_id";
    $result = Database::query($sql);
    $row	= Database::fetch_array($result, 'ASSOC');
    if (!empty($row['expired_time']) ) {
    	$current_expired_time_key = get_time_control_key($exercise_id, $lp_id, $lp_item_id);
    	if (isset($_SESSION['expired_time'][$current_expired_time_key])) {
            $current_time = time();
    		$expired_time = api_strtotime($_SESSION['expired_time'][$current_expired_time_key], 'UTC');
    		$total_time_allowed = $expired_time + 30;
            if ($total_time_allowed < $current_time) {
            	return false;
            }
            return true;
    	} else {
    		return false;
    	}
    } else {
    	return true;
    }
}

/**
    Deletes the time control token
*/
function exercise_time_control_delete($exercise_id,  $lp_id = 0 , $lp_item_id = 0) {
    $current_expired_time_key = get_time_control_key($exercise_id, $lp_id, $lp_item_id);
    unset($_SESSION['expired_time'][$current_expired_time_key]);
}

/**
    Generates the time control key
*/
function get_time_control_key($exercise_id, $lp_id = 0, $lp_item_id = 0) {
    $exercise_id = intval($exercise_id);
    $lp_id = intval($lp_id);
    $lp_item_id = intval($lp_item_id);
    return api_get_course_int_id().'_'.api_get_session_id().'_'.$exercise_id.'_'.api_get_user_id().'_'.$lp_id.'_'.$lp_item_id;
}

/**
 * Get session time control
 */
function get_session_time_control_key($exercise_id, $lp_id = 0, $lp_item_id = 0) {
    $return_value = 0;
    $time_control_key = get_time_control_key($exercise_id, $lp_id, $lp_item_id);
    if (isset($_SESSION['expired_time']) && isset($_SESSION['expired_time'][$time_control_key])) {
        $return_value = $_SESSION['expired_time'][$time_control_key];
    }
    return $return_value;
}

/**
 * Gets count of exam results
 * @todo this function should be moved in a library  + no global calls
 */
function get_count_exam_results($exercise_id, $extra_where_conditions) {
    $count = get_exam_results_data(null, null, null, null, $exercise_id, $extra_where_conditions, true);
    return $count;
}

/**
 * @param string $in_hotpot_path
 * @return int
 */
function get_count_exam_hotpotatoes_results($in_hotpot_path) {
    return get_exam_results_hotpotatoes_data(0, 0, '', '', $in_hotpot_path, true, '');
}

/**
 * @param int $in_from
 * @param int $in_number_of_items
 * @param int $in_column
 * @param int  $in_direction
 * @param string $in_hotpot_path
 * @param bool $in_get_count
 * @param null $where_condition
 * @return array|int
 */
function get_exam_results_hotpotatoes_data($in_from, $in_number_of_items, $in_column, $in_direction, $in_hotpot_path, $in_get_count = false, $where_condition = null)
{
    $course_code = api_get_course_id();
    // by default in_column = 1 If parameters given, it is the name of the column witch is the bdd field name
    if ($in_column == 1) {
        $in_column = 'firstname';
    }
    $in_hotpot_path = Database::escape_string($in_hotpot_path);
    $in_direction = Database::escape_string($in_direction);
    $in_column = Database::escape_string($in_column);
    $in_number_of_items = intval($in_number_of_items);
    $in_from = intval($in_from);

    $TBL_TRACK_HOTPOTATOES = Database :: get_statistic_table(TABLE_STATISTIC_TRACK_E_HOTPOTATOES);
    $TBL_USER = Database :: get_main_table(TABLE_MAIN_USER);

    $sql = "SELECT * FROM $TBL_TRACK_HOTPOTATOES thp
            JOIN $TBL_USER u ON thp.exe_user_id = u.user_id
            WHERE thp.exe_cours_id = '$course_code' AND exe_name LIKE '$in_hotpot_path%'";

    // just count how many answers
    if ($in_get_count) {
        $res = Database::query($sql);
        return Database::num_rows($res);
    }
    // get a number of sorted results
    $sql .= " $where_condition
            ORDER BY $in_column $in_direction
            LIMIT $in_from, $in_number_of_items";

    $res = Database::query($sql);
    $result = array();
    $apiIsAllowedToEdit = api_is_allowed_to_edit();
    $urlBase = api_get_path(WEB_CODE_PATH).'exercice/hotpotatoes_exercise_report.php?action=delete&'.api_get_cidreq().'&id=';
    while ($data = Database::fetch_array($res)) {
        $actions = null;

        if ($apiIsAllowedToEdit) {
            $url = $urlBase.$data['id'].'&path='.$data['exe_name'];
            $actions = Display::url(
                Display::return_icon('delete.png', get_lang('Delete')),
                $url
            );
        }

        $result[] = array(
            'firstname' => $data['firstname'],
            'lastname' => $data['lastname'],
            'username' => $data['username'],
            'group_name' => implode("<br/>", GroupManager::get_user_group_name($data['user_id'])),
            'exe_date' => $data['exe_date'],
            'score' => $data['exe_result'].' / '.$data['exe_weighting'],
            'actions' => $actions,
        );
    }
    return $result;
}

/**
 * Gets the exam'data results
 * @todo this function should be moved in a library  + no global calls
 */
function get_exam_results_data($from, $number_of_items, $column, $direction, $exercise_id, $extra_where_conditions = null, $get_count = false) {

    //@todo replace all this globals
    global $documentPath, $filter;

    $course_id = api_get_course_int_id();
    $course_code = api_get_course_id();

   	$is_allowedToEdit           = api_is_allowed_to_edit(null,true) || api_is_allowed_to_edit(true) || api_is_drh();

    $TBL_USER                   = Database :: get_main_table(TABLE_MAIN_USER);
    $TBL_EXERCICES              = Database :: get_course_table(TABLE_QUIZ_TEST);
    $TBL_GROUP_REL_USER         = Database :: get_course_table(TABLE_GROUP_USER);
    $TBL_GROUP                  = Database :: get_course_table(TABLE_GROUP);
    $TBL_TRACK_EXERCICES        = Database :: get_statistic_table(TABLE_STATISTIC_TRACK_E_EXERCICES);
    $TBL_TRACK_HOTPOTATOES      = Database :: get_statistic_table(TABLE_STATISTIC_TRACK_E_HOTPOTATOES);
    $TBL_TRACK_ATTEMPT_RECORDING= Database :: get_statistic_table(TABLE_STATISTIC_TRACK_E_ATTEMPT_RECORDING);

    $session_id_and = ' AND te.session_id = '.api_get_session_id().' ';

    $exercise_id = intval($exercise_id);

    $exercise_where = '';
    if (!empty($exercise_id)) {
        $exercise_where .= ' AND te.exe_exo_id = '.$exercise_id.'  ';
    }

    $hotpotatoe_where = '';
    if (!empty($_GET['path'])) {
        $hotpotatoe_path = Database::escape_string($_GET['path']);
        $hotpotatoe_where .= ' AND exe_name = "'.$hotpotatoe_path.'"  ';
    }

    // sql for chamilo-type tests for teacher / tutor view
    $sql_inner_join_tbl_track_exercices = " (
                                            SELECT DISTINCT ttte.*, if(tr.exe_id,1, 0) as revised
                                            FROM $TBL_TRACK_EXERCICES ttte LEFT JOIN $TBL_TRACK_ATTEMPT_RECORDING tr
                                            ON (ttte.exe_id = tr.exe_id)
                                            WHERE exe_cours_id = '$course_code' AND
                                                  exe_exo_id = $exercise_id AND
                                                  ttte.session_id = ".api_get_session_id()."
                                            )";
    if ($is_allowedToEdit) {
        //Teacher view
        if (isset($_GET['gradebook']) && $_GET['gradebook'] == 'view') {
            //$exercise_where_query = ' te.exe_exo_id = ce.id AND ';
        }

    	$sqlFromOption                      = "";
    	$sqlWhereOption                     = "";           // for hpsql

        //@todo fix to work with COURSE_RELATION_TYPE_RRHH in both queries

        //Hack in order to filter groups
        $sql_inner_join_tbl_user = '';

        if (strpos($extra_where_conditions, 'group_id')) {
            $sql_inner_join_tbl_user = "
            (
                SELECT u.user_id, firstname, lastname, email, username, g.name as group_name, g.id as group_id
                FROM $TBL_USER u
                INNER JOIN $TBL_GROUP_REL_USER gru ON ( gru.user_id = u.user_id AND gru.c_id=".$course_id.")
                INNER JOIN $TBL_GROUP g ON (gru.group_id = g.id AND g.c_id=".$course_id.")
            )";

        }

        if (strpos($extra_where_conditions, 'group_all')) {

            $extra_where_conditions = str_replace("AND (  group_id = 'group_all'  )", '', $extra_where_conditions);
            $extra_where_conditions = str_replace("AND group_id = 'group_all'", '', $extra_where_conditions);
            $extra_where_conditions = str_replace("group_id = 'group_all' AND", '', $extra_where_conditions);

            $sql_inner_join_tbl_user = "
            (
                SELECT u.user_id, firstname, lastname, email, username, '' as group_name, '' as group_id
                FROM $TBL_USER u
            )";
            $sql_inner_join_tbl_user = null;
        }

        if (strpos($extra_where_conditions, 'group_none')) {
            $extra_where_conditions = str_replace("AND (  group_id = 'group_none'  )", "AND (  group_id is null  )", $extra_where_conditions);
            $extra_where_conditions = str_replace("AND group_id = 'group_none'", "AND (  group_id is null  )", $extra_where_conditions);
            $sql_inner_join_tbl_user = "
            (
                SELECT u.user_id, firstname, lastname, email, username, g.name as group_name, g.id as group_id
                FROM $TBL_USER u
                LEFT OUTER JOIN $TBL_GROUP_REL_USER gru ON ( gru.user_id = u.user_id AND gru.c_id=".$course_id." )
                LEFT OUTER JOIN $TBL_GROUP g ON (gru.group_id = g.id AND g.c_id = ".$course_id.")
            )";
        }

        //All
        $is_empty_sql_inner_join_tbl_user = false;

        if (empty($sql_inner_join_tbl_user)) {
            $is_empty_sql_inner_join_tbl_user = true;
             $sql_inner_join_tbl_user = "
            (
                SELECT u.user_id, firstname, lastname, email, username, ' ' as group_name, '' as group_id
                FROM $TBL_USER u
            )";
        }


        $sqlFromOption = " , $TBL_GROUP_REL_USER AS gru ";
        $sqlWhereOption = "  AND gru.c_id = ".api_get_course_int_id()." AND gru.user_id = user.user_id ";

        $first_and_last_name = api_is_western_name_order() ? "firstname, lastname" : "lastname, firstname";

        if ($get_count) {
            $sql_select = "SELECT count(te.exe_id) ";
        } else {
            $sql_select = "SELECT DISTINCT
                    user_id,
                    $first_and_last_name,
                    ce.title,
                    username,
                    te.exe_result,
                    te.exe_weighting,
                    te.exe_date,
                    te.exe_id,
                    email as exemail,
                    te.start_date,
                    steps_counter,
                    exe_user_id,
                    te.exe_duration,
                    propagate_neg,
                    revised,
                    group_name,
                    group_id,
                    orig_lp_id";
        }

        $sql = " $sql_select
                FROM $TBL_EXERCICES AS ce
                INNER JOIN $sql_inner_join_tbl_track_exercices AS te ON (te.exe_exo_id = ce.id)
                INNER JOIN $sql_inner_join_tbl_user  AS user ON (user.user_id = exe_user_id)
                WHERE
                    te.status != 'incomplete' AND
                    te.exe_cours_id='" . api_get_course_id() . "' $session_id_and AND
                    ce.active <>-1 AND ce.c_id=".api_get_course_int_id()."
                    $exercise_where
                    $extra_where_conditions
                ";

        // sql for hotpotatoes tests for teacher / tutor view

        if ($get_count) {
            $hpsql_select = "SELECT count(username)";
        } else {
            $hpsql_select = "SELECT
                    $first_and_last_name ,
                    username,
                    tth.exe_name,
                    tth.exe_result ,
                    tth.exe_weighting,
                    tth.exe_date";
        }

        $hpsql = " $hpsql_select
                FROM
                    $TBL_TRACK_HOTPOTATOES tth,
                    $TBL_USER user
                    $sqlFromOption
                WHERE
                    user.user_id=tth.exe_user_id
                    AND tth.exe_cours_id = '" . api_get_course_id()."'
                    $hotpotatoe_where
                    $sqlWhereOption
                ORDER BY
                    tth.exe_cours_id ASC,
                    tth.exe_date DESC";
    }

    if ($get_count) {
        $resx = Database::query($sql);
        $rowx = Database::fetch_row($resx,'ASSOC');
        return $rowx[0];
    }

    $teacher_list = CourseManager::get_teacher_list_from_course_code(api_get_course_id());
    $teacher_id_list = array();
    foreach ($teacher_list as $teacher) {
    	$teacher_id_list[] = $teacher['user_id'];
    }

    //Simple exercises
    if (empty($hotpotatoe_where)) {
        $column             = !empty($column) ? Database::escape_string($column) : null;
        $from               = intval($from);
        $number_of_items    = intval($number_of_items);

        if (!empty($column)) {
            $sql .= " ORDER BY $column $direction ";
        }
        $sql .= " LIMIT $from, $number_of_items";

        $results = array();
        $resx = Database::query($sql);
        while ($rowx = Database::fetch_array($resx,'ASSOC')) {
            $results[] = $rowx;
        }

        $list_info = array();

        $group_list = GroupManager::get_group_list();
        $clean_group_list = array();

        if (!empty($group_list)) {
            foreach ($group_list as $group) {
                $clean_group_list[$group['id']] = $group['name'];
            }
        }

        $lp_list_obj = new learnpathList(api_get_user_id());
        $lp_list = $lp_list_obj->get_flat_list();

        if (is_array($results)) {

            $users_array_id = array();
            $from_gradebook = false;
            if (isset($_GET['gradebook']) && $_GET['gradebook'] == 'view') {
                $from_gradebook = true;
            }
            $sizeof = count($results);

            $user_list_id = array ();

            $locked = api_resource_is_locked_by_gradebook($exercise_id, LINK_EXERCISE);

            //Looping results
            for ($i = 0; $i < $sizeof; $i++) {
                $revised = $results[$i]['revised'];

                if ($from_gradebook && ($is_allowedToEdit)) {
                    if (in_array($results[$i]['username'] . $results[$i]['firstname'] . $results[$i]['lastname'], $users_array_id)) {
                        continue;
                    }
                    $users_array_id[] = $results[$i]['username'] . $results[$i]['firstname'] . $results[$i]['lastname'];
                }

                $lp_obj = isset($results[$i]['orig_lp_id']) && isset($lp_list[$results[$i]['orig_lp_id']]) ? $lp_list[$results[$i]['orig_lp_id']] : null;
                $lp_name = null;

                if ($lp_obj) {
                    $url = api_get_path(WEB_CODE_PATH).'newscorm/lp_controller.php?'.api_get_cidreq().'&action=view&lp_id='.$results[$i]['orig_lp_id'];
                    $lp_name =  Display::url($lp_obj['lp_name'], $url, array('target' => '_blank'));
                }

                //Add all groups by user
                $group_name_list = null;

                if ($is_empty_sql_inner_join_tbl_user) {
                    $group_list = GroupManager::get_group_ids(api_get_course_int_id(), $results[$i]['user_id']);

                    foreach ($group_list as $id) {
                        $group_name_list .= $clean_group_list[$id].'<br/>';
                    }
                    $results[$i]['group_name'] = $group_name_list;
                }

                $results[$i]['exe_duration'] =  !empty($results[$i]['exe_duration']) ? round($results[$i]['exe_duration'] / 60) : 0;

                $user_list_id[] = $results[$i]['exe_user_id'];
                $id = $results[$i]['exe_id'];

                $dt = api_convert_and_format_date($results[$i]['exe_weighting']);

                // we filter the results if we have the permission to
                if (isset($results[$i]['results_disabled'])) {
                    $result_disabled = intval($results[$i]['results_disabled']);
                }  else {
                    $result_disabled = 0;
                }

                if ($result_disabled == 0) {

                    $my_res     = $results[$i]['exe_result'];
                    $my_total   = $results[$i]['exe_weighting'];

                    $results[$i]['start_date']  =   api_get_local_time($results[$i]['start_date']);
                    $results[$i]['exe_date']    =   api_get_local_time($results[$i]['exe_date']);

                    if (!$results[$i]['propagate_neg'] && $my_res < 0) {
                        $my_res = 0;
                    }
                    $score = show_score($my_res, $my_total);

                    $actions = '';
                    if ($is_allowedToEdit) {
                        if (isset($teacher_id_list)) {
                            if (in_array($results[$i]['exe_user_id'], $teacher_id_list)) {
                                $actions .= Display::return_icon('teachers.gif', get_lang('Teacher'));
                            }
                        }
                        if ($revised) {
                            $actions .= "<a href='exercise_show.php?".api_get_cidreq()."&action=edit&id=$id'>".Display :: return_icon('edit.png', get_lang('Edit'), array(), ICON_SIZE_SMALL);
                            $actions .= '&nbsp;';
                        } else {
                            $actions .="<a href='exercise_show.php?".api_get_cidreq()."&action=qualify&id=$id'>".Display :: return_icon('quiz.gif', get_lang('Qualify'));
                            $actions .='&nbsp;';
                        }
                        $actions .="</a>";

                        if ($filter == 2) {
                            $actions .=' <a href="exercise_history.php?'.api_get_cidreq().'&exe_id=' . $id . '">' .Display :: return_icon('history.gif', get_lang('ViewHistoryChange')).'</a>';
                        }

                        //Admin can always delete the attempt
                        if ($locked == false || api_is_platform_admin()) {
                            $ip = TrackingUserLog::get_ip_from_user_event($results[$i]['exe_user_id'], date('Y-m-d h:i:s'), false);
                            $actions .= '<a href="http://www.whatsmyip.org/ip-geo-location/?ip='.$ip.'" target="_blank"><img src="'.api_get_path(WEB_CODE_PATH).'img/icons/22/info.png" title="'.$ip.'" /></a>';

                            $delete_link = '<a href="exercise_report.php?'.api_get_cidreq().'&filter_by_user='.intval($_GET['filter_by_user']).'&filter=' . $filter . '&exerciseId='.$exercise_id.'&delete=delete&did=' . $id . '"
                                onclick="javascript:if(!confirm(\'' . sprintf(get_lang('DeleteAttempt'), $results[$i]['username'], $dt) . '\')) return false;">'.Display :: return_icon('delete.png', get_lang('Delete')).'</a>';
                            $delete_link = utf8_encode($delete_link);
                            $actions .= $delete_link.'&nbsp;';
                        }

                    } else {
                    	$attempt_url 	= api_get_path(WEB_CODE_PATH).'exercice/result.php?'.api_get_cidreq().'&id='.$results[$i]['exe_id'].'&id_session='.api_get_session_id().'&height=500&width=750';
                    	$attempt_link 	= Display::url(get_lang('Show'), $attempt_url, array('class'=>'ajax btn'));
                    	$actions .= $attempt_link;
                    }

                    if ($revised) {
                        $revised = Display::label(get_lang('Validated'), 'success');
                    } else {
                        $revised = Display::label(get_lang('NotValidated'), 'info');
                    }

                    if ($is_allowedToEdit) {
    					$results[$i]['status']  =  $revised;
    					$results[$i]['score']   =  $score;
                        $results[$i]['lp']      =  $lp_name;
    					$results[$i]['actions'] =  $actions;
    					$list_info[] = $results[$i];
                    } else {
                        $results[$i]['status']  =  $revised;
    					$results[$i]['score']   =  $score;
                        $results[$i]['actions'] =  $actions;
    					$list_info[] = $results[$i];
                    }
                }
            }
        }
    } else {
        //echo $hpsql; var_dump($hpsql);
        $hpresults = getManyResultsXCol($hpsql, 6);

        // Print HotPotatoes test results.
        if (is_array($hpresults)) {

            for ($i = 0; $i < sizeof($hpresults); $i++) {
                $hp_title = GetQuizName($hpresults[$i][3], $documentPath);
                if ($hp_title == '') {
                    $hp_title = basename($hpresults[$i][3]);
                }
                //var_dump($hpresults[$i]);

                $hp_date = api_get_local_time($hpresults[$i][6], null, date_default_timezone_get());
                $hp_result = round(($hpresults[$i][4] / ($hpresults[$i][5] != 0 ? $hpresults[$i][5] : 1)) * 100, 2).'% ('.$hpresults[$i][4].' / '.$hpresults[$i][5].')';
                if ($is_allowedToEdit) {
                    $list_info[] = array($hpresults[$i][0], $hpresults[$i][1], $hpresults[$i][2], '',  $hp_title, '-',  $hp_date , $hp_result , '-');
                } else {
                    $list_info[] = array($hp_title, '-', $hp_date , $hp_result , '-');
                }
            }
        }
    }

    return $list_info;
}


/**
 * Converts the score with the exercise_max_note and exercise_min_score the platform settings + formats the results using the float_format function
 *
 * @param   float   score
 * @param   float   weight
 * @param   bool    show porcentage or not
 * @param	bool	use or not the platform settings
 * @return  string  an html with the score modified
 */
function show_score($score, $weight, $show_percentage = true, $use_platform_settings = true, $show_only_percentage = false) {
    if (is_null($score) && is_null($weight)) {
        return '-';
    }

    $max_note =  api_get_setting('exercise_max_score');
    $min_note =  api_get_setting('exercise_min_score');

    if ($use_platform_settings) {
        if ($max_note != '' && $min_note != '') {
            if (!empty($weight) && intval($weight) != 0) {
    	       $score = $min_note + ($max_note - $min_note) * $score / $weight;
            } else {
               $score = $min_note;
            }
            $weight = $max_note;
        }
    }
    $percentage = (100 * $score)/ ($weight != 0 ? $weight : 1);

    //Formats values
    $percentage = float_format($percentage, 1);
    $score = float_format($score, 1);
    $weight = float_format($weight, 1);

    $html  = null;
    if ($show_percentage) {
        $parent = '(' . $score . ' / ' . $weight . ')';
        $html = $percentage."%  $parent";
        if ($show_only_percentage) {
            $html = $percentage."% ";
        }
    } else {
    	$html = $score . ' / ' . $weight;
    }
    $html  = Display::span($html, array('class' => 'score_exercise'));
    return $html;
}

function is_success_exercise_result($score, $weight, $pass_percentage) {
    $percentage = float_format(($score / ($weight != 0 ? $weight : 1)) * 100, 1);
    if (isset($pass_percentage) && !empty($pass_percentage)) {
        if ($percentage >= $pass_percentage) {
            return true;
        }
    }
    return false;
}

function show_success_message($score, $weight, $pass_percentage) {
    $res = "";
    if (is_pass_pourcentage_enabled($pass_percentage)) {
        $is_success = is_success_exercise_result($score, $weight, $pass_percentage);

        $icon = '';
        if ($is_success) {
            $html = get_lang('CongratulationsYouPassedTheTest');
            $icon = Display::return_icon('completed.png', get_lang('Correct'), array(), ICON_SIZE_MEDIUM);
        } else {
            //$html .= Display::return_message(get_lang('YouDidNotReachTheMinimumScore'), 'warning');
            $html = get_lang('YouDidNotReachTheMinimumScore');
            $icon = Display::return_icon('warning.png', get_lang('Wrong'), array(), ICON_SIZE_MEDIUM);
        }
        $html = Display::tag('h4', $html);
        $html .= Display::tag('h5', $icon, array('style' => 'width:40px; padding:2px 10px 0px 0px'));
        $res = $html;
    }
    return $res;
}

/**
 * Return true if pass_pourcentage activated (we use the pass pourcentage feature
 * return false if pass_percentage = 0 (we don't use the pass pourcentage feature
 * @param $in_pass_pourcentage
 * @return boolean
 * In this version, pass_percentage and show_success_message are disabled if
 * pass_percentage is set to 0
 */
function is_pass_pourcentage_enabled($in_pass_pourcentage) {
    return $in_pass_pourcentage > 0;
}

/**
 * Converts a numeric value in a percentage example 0.66666 to 66.67 %
 * @param $value
 * @return float Converted number
 */
function convert_to_percentage($value) {
    $return = '-';
    if ($value != '') {
        $return = float_format($value * 100, 1).' %';
    }
    return $return;
}

/**
 * Converts a score/weight values to the platform scale
 * @param   float   score
 * @param   float   weight
 * @return  float   the score rounded converted to the new range
 */
function convert_score($score, $weight) {
    $max_note =  api_get_setting('exercise_max_score');
    $min_note =  api_get_setting('exercise_min_score');

    if ($score != '' && $weight != '') {
        if ($max_note != '' && $min_note != '') {
           if (!empty($weight)) {
               $score   = $min_note + ($max_note - $min_note) * $score / $weight;
           } else {
               $score   = $min_note;
           }
        }
    }
    $score_rounded  = float_format($score, 1);
    return $score_rounded;
}

/**
 * Getting all active exercises from a course from a session (if a session_id is provided we will show all the exercises in the course + all exercises in the session)
 * @param   array   course data
 * @param   int     session id
 * @param   boolean Check publications dates
 * @param   string  Search exercise name
 * @param   boolean Search exercises in all sessions
 * @param   int     0 = only inactive exercises
 *                  1 = only active exercises,
 *                  2 = all exercises
 *                  3 = active <> -1
 * @return  array   array with exercise data
 */
function get_all_exercises($course_info = null, $session_id = 0, $check_publication_dates = false, $search_exercise = '', $search_all_sessions = false, $active = 2) {
    $TBL_EXERCICES = Database :: get_course_table(TABLE_QUIZ_TEST);
    $course_id = api_get_course_int_id();

    if (!empty($course_info) && !empty($course_info['real_id'])) {
    	$course_id = $course_info['real_id'];
    }

    if ($session_id == -1) {
    	$session_id  = 0;
    }

    $now = api_get_utc_datetime();
    $time_conditions = '';

    if ($check_publication_dates) {
        $time_conditions = " AND ((start_time <> '0000-00-00 00:00:00' AND start_time < '$now'  AND end_time <> '0000-00-00 00:00:00' AND end_time > '$now' )  OR "; //start and end are set
        $time_conditions .= " (start_time <> '0000-00-00 00:00:00' AND start_time < '$now'  AND end_time = '0000-00-00 00:00:00') OR "; // only start is set
        $time_conditions .= " (start_time = '0000-00-00 00:00:00'   AND end_time <> '0000-00-00 00:00:00'  AND end_time > '$now') OR   "; // only end is set
        $time_conditions .= " (start_time = '0000-00-00 00:00:00'   AND end_time =  '0000-00-00 00:00:00'))  "; // nothing is set
    }

    $needle_where   = (!empty($search_exercise)) ? " AND title LIKE '?' "       : '';
    $needle         = (!empty($search_exercise)) ? "%" . $search_exercise . "%" : '';

    //Show courses by active status
    $active_sql = '';
    if ($active == 3) {
        $active_sql = ' active <> -1 AND';
    } else if ($active != 2) {
        $active_sql = sprintf(' active = %d AND', $active);
    }

    if ($search_all_sessions == true) {
        $conditions = array('where'=>array($active_sql . ' c_id = ? '. $needle_where . $time_conditions => array($course_id, $needle)), 'order'=>'title');
    } else {
        if ($session_id == 0) {
            $conditions = array('where'=>array($active_sql . ' session_id = ? AND c_id = ? '. $needle_where . $time_conditions => array($session_id, $course_id, $needle)), 'order'=>'title');
        } else {
            $conditions = array('where'=>array($active_sql . ' (session_id = 0 OR session_id = ? ) AND c_id = ? ' . $needle_where . $time_conditions => array($session_id, $course_id, $needle)), 'order'=>'title');
        }
    }

    return Database::select('*',$TBL_EXERCICES, $conditions);
}
/**
 * Get exercise information by id
 * @param int $exerciseId Exercise Id
 * @param int $courseId The course ID (necessary as c_quiz.id is not unique)
 * @return array Exercise info 
 */
function get_exercise_by_id($exerciseId = 0, $courseId = null) {
    $TBL_EXERCICES = Database :: get_course_table(TABLE_QUIZ_TEST);
    if (empty($courseId)) {
        $courseId = api_get_course_int_id();
    } else {
        $courseId = intval($courseId);
    }
    $conditions  = array('where' => array('id = ?' => array($exerciseId), ' AND c_id = ? ' => $courseId));
    return Database::select('*', $TBL_EXERCICES, $conditions);
}
/**
 * Getting all exercises (active only or all)
 * from a course from a session
 * (if a session_id is provided we will show all the exercises in the
 * course + all exercises in the session)
 * @param   array   course data
 * @param   int     session id
 * @param	int		course c_id
 * @param   boolean only_active_exercices
 * @return  array   array with exercise data
 * modified by Hubert Borderiou
 */
function get_all_exercises_for_course_id($course_info = null, $session_id = 0, $course_id=0, $only_active_exercises = true)
{
    $TBL_EXERCISES = Database :: get_course_table(TABLE_QUIZ_TEST);
    $tab_select_param = array();

    if (!$only_active_exercises) {
        $sql_active_exercises = "";
    } else {
        $sql_active_exercises = "active = ? AND";
        $tab_select_param[] = '1';
    }

    $tab_select_param[] = $session_id;
    $tab_select_param[] = $course_id;

    if ($session_id == -1) {
    	$session_id  = 0;
    }

    if ($session_id == 0) {
    	$conditions = array('where'=>array("$sql_active_exercises session_id = ? AND c_id = ?" => $tab_select_param), 'order'=>'title');
    } else {
        //All exercises
    	$conditions = array('where'=>array("$sql_active_exercises (session_id = 0 OR session_id = ? ) AND c_id=?" => $tab_select_param), 'order'=>'title');
    }

    return Database::select('*',$TBL_EXERCISES, $conditions);
}

/**
 * Gets the position of the score based in a given score (result/weight) and the exe_id based in the user list
 * (NO Exercises in LPs )
 * @param   float   user score to be compared *attention* $my_score = score/weight and not just the score
 * @param   int     exe id of the exercise (this is necesary because if 2 students have the same score the one with the minor exe_id will have a best position, just to be fair and FIFO)
 * @param   int     exercise id
 * @param   string  course code
 * @param   int     session id
 * @return  int     the position of the user between his friends in a course (or course within a session)
 */
function get_exercise_result_ranking($my_score, $my_exe_id, $exercise_id, $course_code, $session_id = 0, $user_list = array(), $return_string = true) {
    //No score given we return
    if (is_null($my_score)) {
        return '-';
    }
    if (empty($user_list)) {
        return '-';
    }

    $best_attempts = array();
    foreach ($user_list as $user_data) {
        $user_id = $user_data['user_id'];
        $best_attempts[$user_id]= get_best_attempt_by_user($user_id, $exercise_id, $course_code, $session_id);
    }

    if (empty($best_attempts)) {
    	return 1;
    } else {
        $position = 1;
        $my_ranking = array();
        foreach($best_attempts as $user_id => $result) {
            if (!empty($result['exe_weighting']) && intval($result['exe_weighting']) != 0) {
                $my_ranking[$user_id] = $result['exe_result']/$result['exe_weighting'];
            } else {
                $my_ranking[$user_id] = 0;
            }
        }
        //if (!empty($my_ranking)) {
            asort($my_ranking);
            $position = count($my_ranking);
            if (!empty($my_ranking)) {
                foreach ($my_ranking as $user_id => $ranking) {
                	if ($my_score >= $ranking) {
                        if ($my_score == $ranking) {
                            $exe_id = $best_attempts[$user_id]['exe_id'];
                            if ($my_exe_id < $exe_id) {
                                $position--;
                            }
                        } else {
                		  $position--;
                        }
                	}
                }
            }
        //}
        $return_value = array('position'=>$position, 'count'=>count($my_ranking));
        //var_dump($my_score, $my_ranking);
        if ($return_string) {
            if (!empty($position) && !empty($my_ranking)) {
               $return_value = $position.'/'.count($my_ranking);
            } else {
                $return_value = '-';
            }
        }
        return $return_value;
    }
}

/**
 * Gets the position of the score based in a given score (result/weight) and the exe_id based in all attempts
 * (NO Exercises in LPs ) old funcionality by attempt
 * @param   float   user score to be compared attention => score/weight
 * @param   int     exe id of the exercise (this is necesary because if 2 students have the same score the one with the minor exe_id will have a best position, just to be fair and FIFO)
 * @param   int     exercise id
 * @param   string  course code
 * @param   int     session id
 * @return  int     the position of the user between his friends in a course (or course within a session)
 */
function get_exercise_result_ranking_by_attempt($my_score, $my_exe_id, $exercise_id, $course_code, $session_id = 0, $return_string = true) {
    if (empty($session_id)) {
    	$session_id = 0;
    }
    if (is_null($my_score)) {
        return '-';
    }
    $user_results = get_all_exercise_results($exercise_id, $course_code, $session_id, false);
    $position_data = array();
    if (empty($user_results)) {
    	return 1;
    } else {
        $position = 1;
        $my_ranking = array();
        foreach($user_results as $result) {
            //print_r($result);
            if (!empty($result['exe_weighting']) && intval($result['exe_weighting']) != 0) {
                $my_ranking[$result['exe_id']] = $result['exe_result']/$result['exe_weighting'];
            } else {
                $my_ranking[$result['exe_id']] = 0;
            }
        }
        asort($my_ranking);
        $position = count($my_ranking);
        if (!empty($my_ranking)) {
            foreach($my_ranking as $exe_id=>$ranking) {
            	if ($my_score >= $ranking) {
                    if ($my_score == $ranking) {
                        if ($my_exe_id < $exe_id) {
                            $position--;
                        }
                    } else {
            		  $position--;
                    }
            	}
            }
        }
        $return_value = array('position'=>$position, 'count'=>count($my_ranking));
        //var_dump($my_score, $my_ranking);
        if ($return_string) {
            if (!empty($position) && !empty($my_ranking)) {
               return $position.'/'.count($my_ranking);
            }
        }
        return $return_value;
    }
}


/*
 *  Get the best attempt in a exercise (NO Exercises in LPs )
 */

function get_best_attempt_in_course($exercise_id, $course_code, $session_id) {
    $user_results = get_all_exercise_results($exercise_id, $course_code, $session_id, false);
    $best_score_data = array();
    $best_score = 0;
    if (!empty($user_results)) {
        foreach($user_results as $result) {
            if (!empty($result['exe_weighting']) && intval($result['exe_weighting']) != 0) {
                $score = $result['exe_result']/$result['exe_weighting'];
                if ($score >= $best_score) {
                    $best_score = $score;
                    $best_score_data = $result;
                }
            }
        }
    }
    return $best_score_data;
}

/*
 *  Get the best score in a exercise (NO Exercises in LPs )
 */
function get_best_attempt_by_user($user_id, $exercise_id, $course_code, $session_id) {
    $user_results = get_all_exercise_results($exercise_id, $course_code, $session_id, false, $user_id);
    $best_score_data = array();
    $best_score = 0;
    if (!empty($user_results)) {
        foreach($user_results as $result) {
            if (!empty($result['exe_weighting']) && intval($result['exe_weighting']) != 0) {
                $score = $result['exe_result']/$result['exe_weighting'];
                if ($score >= $best_score) {
                    $best_score = $score;
                    $best_score_data = $result;
                }
            }
        }
    }
    return $best_score_data;
}




/**
 * Get average score (NO Exercises in LPs )
 * @param 	int	exercise id
 * @param 	string	course code
 * @param 	int	session id
 * @return 	float	Average score
 */
function get_average_score($exercise_id, $course_code, $session_id) {
    $user_results = get_all_exercise_results($exercise_id, $course_code, $session_id);
    $avg_score = 0;
    if (!empty($user_results)) {
        foreach($user_results as $result) {
            if (!empty($result['exe_weighting']) && intval($result['exe_weighting']) != 0) {
                $score = $result['exe_result']/$result['exe_weighting'];
                $avg_score +=$score;
            }
        }
        $avg_score = float_format($avg_score / count($user_results), 1);
    }
    return $avg_score;
}

/**
 * Get average score by score (NO Exercises in LPs )
 * @param 	int	exercise id
 * @param 	string	course code
 * @param 	int	session id
 * @return 	float	Average score
 */
function get_average_score_by_course($course_code, $session_id) {
    $user_results = get_all_exercise_results_by_course($course_code, $session_id, false);
    //echo $course_code.' - '.$session_id.'<br />';
    $avg_score = 0;
    if (!empty($user_results)) {
        foreach($user_results as $result) {
            if (!empty($result['exe_weighting']) && intval($result['exe_weighting']) != 0) {
                $score = $result['exe_result']/$result['exe_weighting'];
                //var_dump($score);
                $avg_score +=$score;
            }
        }
        //We asume that all exe_weighting
        //$avg_score = show_score( $avg_score / count($user_results) , $result['exe_weighting']);
        $avg_score = ($avg_score / count($user_results));
    }
    //var_dump($avg_score);
    return $avg_score;
}

function get_average_score_by_course_by_user($user_id, $course_code, $session_id) {
    $user_results = get_all_exercise_results_by_user($user_id, $course_code, $session_id);
    $avg_score = 0;
    if (!empty($user_results)) {
    	foreach($user_results as $result) {
    		if (!empty($result['exe_weighting']) && intval($result['exe_weighting']) != 0) {
    			$score = $result['exe_result']/$result['exe_weighting'];
    			$avg_score +=$score;
    		}
    	}
    	//We asume that all exe_weighting
    	//$avg_score = show_score( $avg_score / count($user_results) , $result['exe_weighting']);
    	$avg_score = ($avg_score / count($user_results));
    }
    return $avg_score;
}


/**
 * Get average score by score (NO Exercises in LPs )
 * @param 	int		exercise id
 * @param 	string	course code
 * @param 	int		session id
 * @return	float	Best average score
 */
function get_best_average_score_by_exercise($exercise_id, $course_code, $session_id, $user_count) {
    $user_results = get_best_exercise_results_by_user($exercise_id, $course_code, $session_id);
    $avg_score = 0;
    if (!empty($user_results)) {
        foreach($user_results as $result) {
            if (!empty($result['exe_weighting']) && intval($result['exe_weighting']) != 0) {
                $score = $result['exe_result']/$result['exe_weighting'];
                $avg_score +=$score;
            }
        }
        //We asume that all exe_weighting
        //$avg_score = show_score( $avg_score / count($user_results) , $result['exe_weighting']);
        //$avg_score = ($avg_score / count($user_results));
        if(!empty($user_count)) {
            $avg_score = float_format($avg_score / $user_count, 1) * 100;
        } else {
            $avg_score = 0;
        }
    }
    return $avg_score;
}

function get_exercises_to_be_taken($course_code, $session_id) {
    $course_info = api_get_course_info($course_code);
    $exercises = get_all_exercises($course_info, $session_id);
    $result = array();
    $now = time() + 15*24*60*60;
    foreach($exercises as $exercise_item) {
    	if (isset($exercise_item['end_time'])  && !empty($exercise_item['end_time']) && $exercise_item['end_time'] != '0000-00-00 00:00:00' && api_strtotime($exercise_item['end_time'], 'UTC') < $now) {
    		$result[] = $exercise_item;
    	}
    }
    return $result;
}

/**
 * Get student results (only in completed exercises) stats by question
 * @param 	int		question id
 * @param 	int		exercise id
 * @param 	string	course code
 * @param 	int		session id
 *
 * */
function get_student_stats_by_question($question_id,  $exercise_id, $course_code, $session_id) {
    $track_exercises	= Database::get_statistic_table(TABLE_STATISTIC_TRACK_E_EXERCICES);
    $track_attempt		= Database::get_statistic_table(TABLE_STATISTIC_TRACK_E_ATTEMPT);

    $question_id 		= intval($question_id);
    $exercise_id 		= intval($exercise_id);
    $course_code 		= Database::escape_string($course_code);
    $session_id 		= intval($session_id);

    $sql = "SELECT MAX(marks) as max , MIN(marks) as min, AVG(marks) as average
    		FROM $track_exercises e INNER JOIN $track_attempt a ON (a.exe_id = e.exe_id)
    		WHERE 	exe_exo_id 		= $exercise_id AND
    				course_code 	= '$course_code' AND
    				e.session_id 	= $session_id AND
    				question_id 	= $question_id AND status = '' LIMIT 1";
    $result = Database::query($sql);
    $return = array();
    if ($result) {
    	$return = Database::fetch_array($result, 'ASSOC');

    }
    return $return;
}

function get_number_students_question_with_answer_count($question_id, $exercise_id, $course_code, $session_id) {
    $track_exercises	= Database::get_statistic_table(TABLE_STATISTIC_TRACK_E_EXERCICES);
    $track_attempt		= Database::get_statistic_table(TABLE_STATISTIC_TRACK_E_ATTEMPT);
    $course_user        = Database::get_main_table(TABLE_MAIN_COURSE_USER);

    $question_id 		= intval($question_id);
    $exercise_id 		= intval($exercise_id);
    $course_code 		= Database::escape_string($course_code);
    $session_id 		= intval($session_id);


    $sql = "SELECT DISTINCT exe_user_id
    		FROM $track_exercises e INNER JOIN $track_attempt a ON (a.exe_id = e.exe_id) INNER JOIN $course_user cu
                ON cu.course_code = a.course_code AND cu.user_id  = exe_user_id
    		WHERE 	exe_exo_id 		= $exercise_id AND
    				a.course_code 	= '$course_code' AND
    				e.session_id 	= $session_id AND
    				question_id 	= $question_id AND
                    answer          <> '0' AND
                    cu.status       = ".STUDENT." AND
                    relation_type  <> 2 AND
                    e.status        = ''";
    $result = Database::query($sql);
    $return = 0;
    if ($result) {
    	$return = Database::num_rows($result);
    }
    return $return;
}

function get_number_students_answer_hotspot_count($answer_id, $question_id,  $exercise_id, $course_code, $session_id) {
    $track_exercises	= Database::get_statistic_table(TABLE_STATISTIC_TRACK_E_EXERCICES);
    $track_hotspot		= Database::get_statistic_table(TABLE_STATISTIC_TRACK_E_HOTSPOT);
    $course_user        = Database::get_main_table(TABLE_MAIN_COURSE_USER);

    $question_id 		= intval($question_id);
    $answer_id          = intval($answer_id);
    $exercise_id 		= intval($exercise_id);
    $course_code 		= Database::escape_string($course_code);
    $session_id 		= intval($session_id);

    $sql = "SELECT DISTINCT exe_user_id
    		FROM $track_exercises e INNER JOIN $track_hotspot a ON (a.hotspot_exe_id = e.exe_id) INNER JOIN $course_user cu
                ON cu.course_code = a.hotspot_course_code AND cu.user_id  = exe_user_id
    		WHERE 	exe_exo_id              = $exercise_id AND
    				a.hotspot_course_code 	= '$course_code' AND
    				e.session_id            = $session_id AND
                    hotspot_answer_id       = $answer_id AND
    				hotspot_question_id     = $question_id AND
                    cu.status               = ".STUDENT." AND
                    hotspot_correct         =  1 AND
                    relation_type           <> 2 AND
                    e.status                = ''";

    $result = Database::query($sql);
    $return = 0;
    if ($result) {
    	$return = Database::num_rows($result);
    }
    return $return;
}


function get_number_students_answer_count($answer_id, $question_id, $exercise_id, $course_code, $session_id, $question_type = null, $correct_answer = null, $current_answer = null) {
    $track_exercises	= Database::get_statistic_table(TABLE_STATISTIC_TRACK_E_EXERCICES);
    $track_attempt		= Database::get_statistic_table(TABLE_STATISTIC_TRACK_E_ATTEMPT);
    $course_user        = Database::get_main_table(TABLE_MAIN_COURSE_USER);

    $question_id 		= intval($question_id);
    $answer_id          = intval($answer_id);
    $exercise_id 		= intval($exercise_id);
    $course_code 		= Database::escape_string($course_code);
    $session_id 		= intval($session_id);

    switch ($question_type) {
        case FILL_IN_BLANKS:
            $answer_condition = "";
            $select_condition = " e.exe_id, answer ";
            break;
        case MATCHING:
        default:
            $answer_condition = " answer = $answer_id AND ";
            $select_condition = " DISTINCT exe_user_id ";
    }

    $sql = "SELECT $select_condition
    		FROM $track_exercises e INNER JOIN $track_attempt a ON (a.exe_id = e.exe_id) INNER JOIN $course_user cu
                ON cu.course_code = a.course_code AND cu.user_id  = exe_user_id
    		WHERE 	exe_exo_id 		= $exercise_id AND
    				a.course_code 	= '$course_code' AND
    				e.session_id 	= $session_id AND
                    $answer_condition
    				question_id 	= $question_id AND
                    cu.status        = ".STUDENT." AND
                    relation_type <> 2 AND
                    e.status = ''";
    //var_dump($sql);
    $result = Database::query($sql);
    $return = 0;
    if ($result) {
        $good_answers = 0;
        switch ($question_type) {
            case FILL_IN_BLANKS:
                while ($row = Database::fetch_array($result, 'ASSOC')) {
                    $fill_blank = check_fill_in_blanks($correct_answer, $row['answer']);
                    if (isset($fill_blank[$current_answer]) && $fill_blank[$current_answer] == 1 ) {
                        $good_answers++;
                    }
                }
                return $good_answers;
                break;
            case MATCHING:
            default:
                $return = Database::num_rows($result);
        }
    }
    return $return;
}


function check_fill_in_blanks($answer, $user_answer) {
    // the question is encoded like this
    // [A] B [C] D [E] F::10,10,10@1
    // number 1 before the "@" means that is a switchable fill in blank question
    // [A] B [C] D [E] F::10,10,10@ or  [A] B [C] D [E] F::10,10,10
    // means that is a normal fill blank question
    // first we explode the "::"
    $pre_array = explode('::', $answer);
    // is switchable fill blank or not
    $last = count($pre_array) - 1;
    $is_set_switchable = explode('@', $pre_array[$last]);
    $switchable_answer_set = false;
    if (isset ($is_set_switchable[1]) && $is_set_switchable[1] == 1) {
        $switchable_answer_set = true;
    }
    $answer = '';
    for ($k = 0; $k < $last; $k++) {
        $answer .= $pre_array[$k];
    }
    // splits weightings that are joined with a comma
    $answerWeighting = explode(',', $is_set_switchable[0]);

    // we save the answer because it will be modified
    //$temp = $answer;
    $temp = $answer;

    $answer = '';
    $j = 0;
    //initialise answer tags
    $user_tags = $correct_tags = $real_text = array ();
    // the loop will stop at the end of the text
    while (1) {
        // quits the loop if there are no more blanks (detect '[')
        if (($pos = api_strpos($temp, '[')) === false) {
            // adds the end of the text
            $answer = $temp;
            /* // Deprecated code
             // TeX parsing - replacement of texcode tags
            $texstring = api_parse_tex($texstring);
            $answer = str_replace("{texcode}", $texstring, $answer);
            */
            $real_text[] = $answer;
            break; //no more "blanks", quit the loop
        }
        // adds the piece of text that is before the blank
        //and ends with '[' into a general storage array
        $real_text[] = api_substr($temp, 0, $pos +1);
        $answer .= api_substr($temp, 0, $pos +1);
        //take the string remaining (after the last "[" we found)
        $temp = api_substr($temp, $pos +1);
        // quit the loop if there are no more blanks, and update $pos to the position of next ']'
        if (($pos = api_strpos($temp, ']')) === false) {
            // adds the end of the text
            $answer .= $temp;
            break;
        }

        $str = $user_answer;

        preg_match_all('#\[([^[]*)\]#', $str, $arr);
        $str = str_replace('\r\n', '', $str);
        $choice = $arr[1];

        $tmp = api_strrpos($choice[$j],' / ');
        $choice[$j] = api_substr($choice[$j],0,$tmp);
        $choice[$j] = trim($choice[$j]);

        //Needed to let characters ' and " to work as part of an answer
        $choice[$j] = stripslashes($choice[$j]);

        $user_tags[] = api_strtolower($choice[$j]);
        //put the contents of the [] answer tag into correct_tags[]
        $correct_tags[] = api_strtolower(api_substr($temp, 0, $pos));
        $j++;
        $temp = api_substr($temp, $pos +1);
    }

    $answer = '';
    $real_correct_tags = $correct_tags;
    $chosen_list = array();

    $good_answer = array();

    for ($i = 0; $i < count($real_correct_tags); $i++) {
        if (!$switchable_answer_set) {
            //needed to parse ' and " characters
            $user_tags[$i] = stripslashes($user_tags[$i]);
            if ($correct_tags[$i] == $user_tags[$i]) {
                $good_answer[$correct_tags[$i]] = 1;
            } elseif (!empty ($user_tags[$i])) {
                $good_answer[$correct_tags[$i]] = 0;
            } else {
                $good_answer[$correct_tags[$i]] = 0;
            }
        } else {
            // switchable fill in the blanks
            if (in_array($user_tags[$i], $correct_tags)) {
                $correct_tags = array_diff($correct_tags, $chosen_list);
                $good_answer[$correct_tags[$i]] = 1;
            } elseif (!empty ($user_tags[$i])) {
                $good_answer[$correct_tags[$i]] = 0;
            } else {
                $good_answer[$correct_tags[$i]] = 0;
            }
        }
        // adds the correct word, followed by ] to close the blank
        $answer .= ' / <font color="green"><b>' . $real_correct_tags[$i] . '</b></font>]';
        if (isset ($real_text[$i +1])) {
            $answer .= $real_text[$i +1];
        }
    }
    return $good_answer;
}


function get_number_students_finish_exercise($exercise_id, $course_code, $session_id) {
    $track_exercises	= Database::get_statistic_table(TABLE_STATISTIC_TRACK_E_EXERCICES);
    $track_attempt		= Database::get_statistic_table(TABLE_STATISTIC_TRACK_E_ATTEMPT);

    $exercise_id 		= intval($exercise_id);
    $course_code 		= Database::escape_string($course_code);
    $session_id 		= intval($session_id);

    $sql = "SELECT DISTINCT exe_user_id
    		FROM $track_exercises e INNER JOIN $track_attempt a ON (a.exe_id = e.exe_id)
    		WHERE 	exe_exo_id 		= $exercise_id AND
    				course_code 	= '$course_code' AND
    				e.session_id 	= $session_id AND
    				status = ''";
    $result = Database::query($sql);
    $return = 0;
    if ($result) {
    	$return = Database::num_rows($result);

    }
    return $return;
}



/**
// return the HTML code for a menu with students group
// @input : $in_name : is the name and the id of the <select>
//          $in_default : default value for option
// @return : the html code of the <select>
*/
function displayGroupMenu($in_name, $in_default, $in_onchange="") {
    // check the default value of option
    $tabSelected = array($in_default => " selected='selected' ");
    $res = "";
    $res .= "<select name='$in_name' id='$in_name' onchange='".$in_onchange."' >";
    $res .= "<option value='-1'".$tabSelected["-1"].">-- ".get_lang('AllGroups')." --</option>";
    $res .= "<option value='0'".$tabSelected["0"].">- ".get_lang('NotInAGroup')." -</option>";
    $tabGroups = GroupManager::get_group_list();
    $currentCatId = 0;
    for ($i=0; $i < count($tabGroups); $i++) {
        $tabCategory = GroupManager::get_category_from_group($tabGroups[$i]["id"]);
        if ($tabCategory["id"] != $currentCatId) {
            $res .= "<option value='-1' disabled='disabled'>".$tabCategory["title"]."</option>";
            $currentCatId = $tabCategory["id"];
        }
        $res .= "<option ".$tabSelected[$tabGroups[$i]["id"]]."style='margin-left:40px' value='".$tabGroups[$i]["id"]."'>".$tabGroups[$i]["name"]."</option>";
    }
    $res .= "</select>";
    return $res;
}


/**
 * Return a list of group for user with user_id=in_userid separated with in_separator
 * @deprecated ?
 */
function displayGroupsForUser($in_separator, $in_userid) {
    $res = implode($in_separator, GroupManager::get_user_group_name($in_userid));
    if ($res == "") {
        $res = "<div style='text-align:center'>-</div>";
    }
    return $res;
}

function create_chat_exercise_session($exe_id) {
    if (!isset($_SESSION['current_exercises'])) {
        $_SESSION['current_exercises'] = array();
    }
    $_SESSION['current_exercises'][$exe_id] = true;
}

function delete_chat_exercise_session($exe_id) {
    if (isset($_SESSION['current_exercises'])) {
        $_SESSION['current_exercises'][$exe_id] = false;
    }
}


/**
 * Display the exercise results
 * @param Exercise $objExercise
 * @param int $exe_id
 * @param bool $save_user_result save users results (true) or just show the results (false)
 */
function display_question_list_by_attempt($objExercise, $exe_id, $save_user_result = false)
{
    global $origin, $debug;

    //Getting attempt info
    $exercise_stat_info = $objExercise->get_stat_track_exercise_info_by_exe_id($exe_id);

    //Getting question list
    $question_list = array();
    if (!empty($exercise_stat_info['data_tracking'])) {
        $question_list = explode(',', $exercise_stat_info['data_tracking']);
    } else {
        //Try getting the question list only if save result is off
        if ($save_user_result == false) {
            $question_list = $objExercise->get_validated_question_list();
        }
        //error_log("Data tracking is empty! exe_id: $exe_id");
    }

    $counter = 1;
    $total_score = $total_weight = 0;

    $exercise_content = null;

    //Hide results
    $show_results     = false;
    $show_only_score  = false;

    if ($objExercise->results_disabled == RESULT_DISABLE_SHOW_SCORE_AND_EXPECTED_ANSWERS) {
        $show_results = true;
    }

    if (in_array($objExercise->results_disabled, array(RESULT_DISABLE_SHOW_SCORE_ONLY, RESULT_DISABLE_SHOW_FINAL_SCORE_ONLY_WITH_CATEGORIES))) {
        $show_only_score = true;
    }

    // Not display expected answer, but score, and feedback
    $show_all_but_expected_answer = false;
    if ($objExercise->results_disabled == RESULT_DISABLE_SHOW_SCORE_ONLY &&
        $objExercise->feedback_type == EXERCISE_FEEDBACK_TYPE_END
    ) {
        $show_all_but_expected_answer = true;
        $show_results = true;
        $show_only_score = false;
    }

    if ($show_results || $show_only_score) {
        $user_info   = api_get_user_info($exercise_stat_info['exe_user_id']);
        //Shows exercise header
        echo $objExercise->show_exercise_result_header(
            $user_info['complete_name'],
            api_convert_and_format_date($exercise_stat_info['start_date'], DATE_TIME_FORMAT_LONG),
            $exercise_stat_info['duration']
        );
    }

    // Display text when test is finished #4074 and for LP #4227
    $end_of_message = $objExercise->selectTextWhenFinished();
    if (!empty($end_of_message)) {
        Display::display_normal_message($end_of_message, false);
        echo "<div class='clear'>&nbsp;</div>";
    }

    $question_list_answers = array();
    $media_list = array();
    $category_list = array();

    // Loop over all question to show results for each of them, one by one
    if (!empty($question_list)) {
        foreach ($question_list as $questionId) {

            // creates a temporary Question object
            $objQuestionTmp = Question::read($questionId);

            // This variable came from exercise_submit_modal.php
            ob_start();

            // We're inside *one* question. Go through each possible answer for this question
            $result = $objExercise->manage_answer(
                $exercise_stat_info['exe_id'],
                $questionId,
                null,
                'exercise_result',
                array(),
                $save_user_result,
                true,
                $show_results,
                $objExercise->selectPropagateNeg(),
                array()
            );

            if (empty($result)) {
                continue;
            }

            $total_score += $result['score'];
            $total_weight += $result['weight'];

            $question_list_answers[] = array(
                'question' => $result['open_question'],
                'answer' => $result['open_answer'],
                'answer_type' => $result['answer_type']
            );

            $my_total_score  = $result['score'];
            $my_total_weight = $result['weight'];

            // Category report
            $category_was_added_for_this_test = false;

            if (isset($objQuestionTmp->category) && !empty($objQuestionTmp->category)) {
                $category_list[$objQuestionTmp->category]['score'] += $my_total_score;
                $category_list[$objQuestionTmp->category]['total'] += $my_total_weight;
                $category_was_added_for_this_test = true;
            }

            if (isset($objQuestionTmp->category_list) && !empty($objQuestionTmp->category_list)) {
                foreach($objQuestionTmp->category_list as $category_id) {
                    $category_list[$category_id]['score'] += $my_total_score;
                    $category_list[$category_id]['total'] += $my_total_weight;
                    $category_was_added_for_this_test = true;
                }
            }

            // No category for this question!
            if ($category_was_added_for_this_test == false) {
                if (!isset($category_list['none']['score'])) {
                    $category_list['none']['score'] = 0;
                }
                if (!isset($category_list['none']['total'])) {
                    $category_list['none']['total'] = 0;
                }

                $category_list['none']['score'] += $my_total_score;
                $category_list['none']['total'] += $my_total_weight;
            }

            if ($objExercise->selectPropagateNeg() == 0 && $my_total_score < 0) {
                $my_total_score = 0;
            }

            $comnt = null;
            if ($show_results) {
                $comnt = get_comments($exe_id, $questionId);
                if (!empty($comnt)) {
                    echo '<b>'.get_lang('Feedback').'</b>';
                    echo '<div id="question_feedback">'.$comnt.'</div>';
                }
            }

            $score = array();
            if ($show_results) {
                $score['result']    = get_lang('Score')." : ".show_score($my_total_score, $my_total_weight, false, true);
                $score['pass']      = $my_total_score >= $my_total_weight ? true : false;
                $score['score']     = $my_total_score;
                $score['weight']    = $my_total_weight;
                $score['comments']  = $comnt;
            }

            $contents = ob_get_clean();

            $question_content = '<div class="question_row">';

            if ($show_results) {
                $show_media = false;
                /*if ($objQuestionTmp->parent_id != 0 && !in_array($objQuestionTmp->parent_id, $media_list)) {
                    $show_media = true;
                    $media_list[] = $objQuestionTmp->parent_id;
                }*/
                //Shows question title an description
                $question_content .= $objQuestionTmp->return_header(null, $counter, $score);
            }
            $counter++;

            $question_content .= $contents;
            $question_content .= '</div>';

            $exercise_content .= $question_content;

        } // end foreach() block that loops over all questions
    }

    $total_score_text = null;

    if ($origin != 'learnpath') {
        if ($show_results || $show_only_score) {
            $total_score_text .= '<div class="question_row">';
            $total_score_text .= get_question_ribbon($objExercise, $total_score, $total_weight, true);
            $total_score_text .= '</div>';
        }
    }

    if (!empty($category_list) && ($show_results || $show_only_score) ) {
        //Adding total
        $category_list['total'] = array('score' => $total_score, 'total' => $total_weight);
        echo Testcategory::get_stats_table_by_attempt($objExercise->id, $category_list);
    }

    if ($show_all_but_expected_answer) {
        $exercise_content .= "<div class='normal-message'>".get_lang("ExerciseWithFeedbackWithoutCorrectionComment")."</div>";
    }
    // Remove audio autoplay from questions on results page - refs BT#7939
    $exercise_content = preg_replace('/autoplay[\=\".+\"]+/','',$exercise_content);

    echo $total_score_text;
    echo $exercise_content;
    if (!$show_only_score) {
        echo $total_score_text;
    }

    if ($save_user_result) {

        // Tracking of results
        $learnpath_id           = $exercise_stat_info['orig_lp_id'];
        $learnpath_item_id      = $exercise_stat_info['orig_lp_item_id'];
        $learnpath_item_view_id = $exercise_stat_info['orig_lp_item_view_id'];

        if (api_is_allowed_to_session_edit()) {
            update_event_exercice(
                $exercise_stat_info['exe_id'],
                $objExercise->selectId(),
                $total_score,
                $total_weight,
                api_get_session_id(),
                $learnpath_id,
                $learnpath_item_id,
                $learnpath_item_view_id,
                $exercise_stat_info['exe_duration'],
                $question_list,
                '',
                array()
            );
        }

        // Send notification ..
        if (!api_is_allowed_to_edit(null,true)) {
            if (api_get_course_setting('email_alert_manager_on_new_quiz') == 1 ) {
                $objExercise->send_mail_notification_for_exam($question_list_answers, $origin, $exe_id);
            }
            $objExercise->send_notification_for_open_questions($question_list_answers, $origin, $exe_id);
            $objExercise->send_notification_for_oral_questions($question_list_answers, $origin, $exe_id);
        }
    }
}


function get_question_ribbon($objExercise, $score, $weight, $check_pass_percentage = false) {
    $ribbon = '<div class="ribbon">';
    if ($check_pass_percentage) {
        $is_success = is_success_exercise_result($score, $weight, $objExercise->selectPassPercentage());
        // Color the final test score if pass_percentage activated
        $ribbon_total_success_or_error = "";
        if (is_pass_pourcentage_enabled($objExercise->selectPassPercentage())) {
            if ($is_success) {
                $ribbon_total_success_or_error = ' ribbon-total-success';
            } else {
                $ribbon_total_success_or_error = ' ribbon-total-error';
            }
        }
        $ribbon .= '<div class="rib rib-total '.$ribbon_total_success_or_error.'">';
    } else {
        $ribbon .= '<div class="rib rib-total">';
    }
    $ribbon .= '<h3>'.get_lang('YourTotalScore').":&nbsp;";
    $ribbon .= show_score($score, $weight, false, true);
    $ribbon .= '</h3>';
    $ribbon .= '</div>';
    if ($check_pass_percentage) {
        $ribbon .= show_success_message($score, $weight, $objExercise->selectPassPercentage());
    }


    $ribbon .= '</div>';
    return $ribbon;
}

function detectInputAppropriateClass($countLetter)
{
    $limits = array(
        0 => 'input-mini',
        10 => 'input-mini',
        15 => 'input-medium',
        20 => 'input-xlarge',
        40 => 'input-xlarge',
        60 => 'input-xxlarge',
        100  => 'input-xxlarge',
        200 => 'input-xxlarge',
    );
    foreach ($limits as $size => $item) {
        if ($countLetter <= $size) {
            return $item;
        }
    }
    return $limits[0];
}
