<?php

/* For licensing terms, see /license.txt */

/**
 * SubLanguageManager class definition file
 * @package chamilo.admin.sublanguage 
 * @todo clean this lib and move to main/inc/lib
 */
class SubLanguageManager {

    private function __construct() {
        //void
    }

    /**
     * Get all files of lang folder (forum.inc.php,gradebook.inc.php,notebook.inc.php)
     * @param String The lang path folder  (/var/www/my_lms/main/lang/spanish)
     * @param bool true if we only want the "subname" trad4all instead of  trad4all.inc.php
     * @return Array All file of lang folder
     *
     */
    public static function get_lang_folder_files_list($path, $only_main_name = false) {
        $content_dir = array();
        if (is_dir($path)) {
            if ($dh = opendir($path)) {
                while (($file = readdir($dh)) !== false) {
                    if ($file[0] <> '.' && substr($file, -4, strlen($file)) == '.php') {
                        if ($only_main_name) {
                            if ($file != '' && strpos($file, '.inc.php'))
                                $content_dir[] = substr($file, 0, strpos($file, '.inc.php'));
                        } else {
                            $content_dir[] = $file;
                        }
                    }
                }
            }
            closedir($dh);
            return $content_dir;
        }
    }

    /**
     * Get all information of sub-language
     * @param Integer The parent id(Language father id)
     * @param Integer The sub language id
     * @return Array All information about sub-language
     */
    public static function get_all_information_of_sub_language($parent_id, $sub_language_id) {
        $tbl_admin_languages = Database :: get_main_table(TABLE_MAIN_LANGUAGE);
        $sql = 'SELECT * FROM ' . $tbl_admin_languages . ' WHERE parent_id="' . Database::escape_string($parent_id) . '" AND id="' . Database::escape_string($sub_language_id) . '"';
        $rs = Database::query($sql);
        $all_information = array();
        while ($row = Database::fetch_array($rs, 'ASSOC')) {
            $all_information = $row;
        }
        return $all_information;
    }

    /**
     * Get all information of language
     * @param Integer The parent id(Language father id)
     * @return Array All information about language
     */
    public static function get_all_information_of_language($parent_id) {
        $tbl_admin_languages = Database :: get_main_table(TABLE_MAIN_LANGUAGE);
        $sql = 'SELECT * FROM ' . $tbl_admin_languages . ' WHERE id = "' . intval($parent_id) . '"';
        $rs = Database::query($sql);
        $all_information = array();
        while ($row = Database::fetch_array($rs, 'ASSOC')) {
            $all_information = $row;
        }
        return $all_information;
    }

    /**
     * Get all information of chamilo file
     * @param String The chamilo path file (/var/www/chamilo/main/lang/spanish/gradebook.inc.php)
     * @patam Bool Whether we want to remove the '$' prefix in the results or not
     * @return Array Contains all information of chamilo file
     */
    public static function get_all_language_variable_in_file($system_path_file, $get_as_string_index = false) {
        $res_list = array();
        if (!is_readable($system_path_file)) {
            return $res_list;
        }
        $info_file = file($system_path_file);
        foreach ($info_file as $line) {
            if (substr($line, 0, 1) != '$') {
                continue;
            }
            list($var, $val) = split('=', $line, 2);
            $var = trim($var);
            $val = trim($val);
            if ($get_as_string_index) { //remove the prefix $
                $var = substr($var, 1);
            }
            $res_list[$var] = $val;
        }
        return $res_list;
    }

    /**
     * Add file in sub-language directory and add header(tag php)
     * @param String The chamilo path file (/var/www/chamilo/main/lang/spanish/gradebook.inc.php)
     * @return bool
     */
    public static function add_file_in_language_directory($system_path_file) {
        $return_value = false;
        $return_value = @file_put_contents($system_path_file, '<?php' . PHP_EOL);
        return $return_value;
    }

    /**
     * Write in file of sub-language
     * @param String The path file (/var/www/chamilo/main/lang/spanish/gradebook.inc.php)
     * @param String The new sub-language
     * @param String The language variable
     * @return Boolean True on success, False on error
     */
    public static function write_data_in_file($path_file, $new_term, $new_variable) {
        $return_value = false;
        $new_data = $new_variable . '=' . $new_term;
        $resource = @fopen($path_file, "a");
        if (file_exists($path_file) && $resource) {
            if (fwrite($resource, $new_data . PHP_EOL) === false) {
                //not allow to write
                $return_value = false;
            } else {
                $return_value = true;
            }
            fclose($resource);
        }
        return $return_value;
    }

    /**
     * Add directory for sub-language
     * @param String The sub-language directory ( e.g. 'spanish_corporate' )
     * @return boolean  True on success, false on failure
     */
    public static function add_language_directory($sub_language_dir) {
        if (empty($sub_language_dir)) {
            return false;
        }
        $dir = api_get_path(SYS_LANG_PATH) . $sub_language_dir;
        if (is_dir($dir)) {
            return true;
        } //even if the dir already exists, we reach the objective of having the directory there
        return @mkdir($dir, api_get_permissions_for_new_directories());
    }

    /**
     * Delete sub-language.
     * In order to avoid deletion of main laguages, we check the existence of a parent
     * @param Integer The parent id
     * @return bool    True on success, false on error
     */
    public static function remove_sub_language($parent_id, $sub_language_id) {
        if (empty($parent_id) or (intval($parent_id) != $parent_id) or empty($sub_language_id) or (intval($sub_language_id) != $sub_language_id)) {
            return false;
        }
        $tbl_admin_languages = Database :: get_main_table(TABLE_MAIN_LANGUAGE);
        $sql = 'SELECT dokeos_folder FROM ' . $tbl_admin_languages . ' WHERE parent_id = ' . $parent_id . ' and id = ' . $sub_language_id;
        $res = Database::query($sql);
        if ($res === false or Database::num_rows($res) < 1) {
            return false;
        }
        $row = Database::fetch_assoc($res);
        $res = SubLanguageManager::remove_language_directory($row['dokeos_folder']);
        if ($res === false) {
            return false;
        } //can't delete dir, so do not delete language record
        $sql = 'DELETE FROM ' . $tbl_admin_languages . ' WHERE id="' . Database::escape_string($sub_language_id) . '" ';
        $res = Database::query($sql);
        return $res;
    }

    /**
     * Remove directory for sub-language
     * @param String The sub-language path directory ( e.g. 'spanish_corporate'' )
     * @return boolean  True on success, false on failure
     */
    public static function remove_language_directory($sub_language_dir) {
        if (empty($sub_language_dir)) {
            return false;
        }
        $dir = api_get_path(SYS_LANG_PATH) . $sub_language_dir;
        if (!is_dir($dir)) {
            return true;
        } //even if the dir does not exist, we reach the objective of not having the directory there
        $content = SubLanguageManager::get_lang_folder_files_list($dir);

        if (count($content) > 0) {
            foreach ($content as $value_content) {
                $path_file = $dir . '/' . $value_content;
                unlink($path_file);
            }
            return @rmdir($dir);
        } else {
            return @rmdir($dir);
        }
    }

    /**
     * check if language exist by id
     * @param Integer The language id
     * @return Boolean
     */
    public static function check_if_exist_language_by_id($language_id) {
        $tbl_admin_languages = Database :: get_main_table(TABLE_MAIN_LANGUAGE);
        $sql = 'SELECT count(*) as count FROM ' . $tbl_admin_languages . ' WHERE id="' . intval($language_id) . '"';
        $rs = Database::query($sql);
        if (Database::num_rows($rs) > 0) {
            if (Database::result($rs, 0, 'count') == 1) {
                return true;
            } else {
                return false;
            }
        } else {
            return false;
            ;
        }
    }

    /**
     * Get name of language by id
     * @param Integer The language id
     * @return String The original name of language
     */
    public static function get_name_of_language_by_id($language_id) {
        $tbl_admin_languages = Database :: get_main_table(TABLE_MAIN_LANGUAGE);
        $sql = 'SELECT original_name FROM ' . $tbl_admin_languages . ' WHERE id="' . Database::escape_string($language_id) . '"';
        $rs = Database::query($sql);
        if (Database::num_rows($rs) > 0) {
            return Database::result($rs, 0, 'original_name');
        } else {
            return '';
        }
    }

    /**
     * Verified if language is sub-language
     * @param Integer The language id
     * @return Boolean
     */
    public static function check_if_language_is_sub_language($language_id) {
        $tbl_admin_languages = Database :: get_main_table(TABLE_MAIN_LANGUAGE);
        $sql = 'SELECT count(*) AS count FROM ' . $tbl_admin_languages . ' WHERE id="' . Database::escape_string($language_id) . '" AND NOT ISNULL(parent_id)';
        $rs = Database::query($sql);

        if (Database::num_rows($rs) > 0 && Database::result($rs, '0', 'count') == 1) {
            return true;
        } else {
            return false;
        }
    }
    
    public static function check_if_language_is_used($language_id) {
        $language_info = self::get_all_information_of_language($language_id);        
        $user_table = Database :: get_main_table(TABLE_MAIN_USER);
        $sql = 'SELECT count(*) AS count FROM ' . $user_table . ' WHERE language ="' . Database::escape_string($language_info['english_name']).'"';
        $rs = Database::query($sql);
        if (Database::num_rows($rs) > 0 && Database::result($rs, '0', 'count') >= 1) {
            return true;
        } else {
            return false;
        }
    }

    /**
     * Verified if language is father of an sub-language
     * @param Integer The language id
     * @return Boolean
     */
    public static function check_if_language_is_father($language_id) {
        $tbl_admin_languages = Database :: get_main_table(TABLE_MAIN_LANGUAGE);
        $sql = 'SELECT count(*) AS count FROM ' . $tbl_admin_languages . ' WHERE parent_id="' . Database::escape_string($language_id) . '" AND NOT ISNULL(parent_id);';
        $rs = Database::query($sql);

        if (Database::num_rows($rs) > 0 && Database::result($rs, '0', 'count') == 1) {
            return true;
        } else {
            return false;
        }
    }

    /**
     * Make unavailable the language
     * @param Integer The language id
     * @return void()
     */
    public static function make_unavailable_language($language_id) {
        $tbl_admin_languages = Database :: get_main_table(TABLE_MAIN_LANGUAGE);
        $sql_make_unavailable = "UPDATE $tbl_admin_languages SET available='0' WHERE id='" . Database::escape_string($language_id) . "'";
        $result = Database::query($sql_make_unavailable);
        return $result !== false; //only return false on sql error
    }

    /**
     * Make available the language
     * @param Integer The language id
     * @return void
     */
    public static function make_available_language($language_id) {
        $tbl_admin_languages = Database :: get_main_table(TABLE_MAIN_LANGUAGE);
        $sql_make_available = "UPDATE $tbl_admin_languages SET available='1' WHERE id='" . Database::escape_string($language_id) . "'";
        $result = Database::query($sql_make_available);
        return $result !== false; //only return false on sql error
    }

    /**
     * Set platform language
     * @param Integer The language id
     * @return bool
     */
    public static function set_platform_language($language_id) {
        if (empty($language_id) or (intval($language_id) != $language_id)) {
            return false;
        }
        $tbl_admin_languages = Database :: get_main_table(TABLE_MAIN_LANGUAGE);
        $tbl_settings_current = Database :: get_main_table(TABLE_MAIN_SETTINGS_CURRENT);
        $sql_update = "SELECT english_name FROM " . $tbl_admin_languages . " WHERE id='" . Database::escape_string($language_id) . "'";
        $result = Database::query($sql_update);
        $lang = Database::fetch_array($result);
        $sql_update_2 = "UPDATE " . $tbl_settings_current . " SET selected_value='" . $lang['english_name'] . "' WHERE variable='platformLanguage'";
        $result_2 = Database::query($sql_update_2);
        event_system(LOG_PLATFORM_LANGUAGE_CHANGE, LOG_PLATFORM_LANGUAGE, $lang['english_name']);
        return $result_2 !== false;
    }

    /**
     * Get platform language ID
     * @return     int     The platform language ID
     */
    public static function get_platform_language_id() {
        $name = api_get_setting('platformLanguage');
        $tbl_admin_languages = Database :: get_main_table(TABLE_MAIN_LANGUAGE);
        $sql = "SELECT id FROM " . $tbl_admin_languages . " WHERE english_name ='$name'";
        $res = Database::query($sql);
        if (Database::num_rows($res) < 1) {
            return false;
        }
        $row = Database::fetch_array($res);
        return $row['id'];
    }

    /*
     * Get parent language path (or null if no parent)
     * @param    string  Children language path
     * @return   string  Parent language path or null
     */
    public static function get_parent_language_path($language_path) {
        $tbl_admin_languages = Database :: get_main_table(TABLE_MAIN_LANGUAGE);
        $tbl_settings_current = Database :: get_main_table(TABLE_MAIN_SETTINGS_CURRENT);
        $sql_update = "SELECT dokeos_folder FROM " . $tbl_admin_languages . " WHERE id=(SELECT parent_id FROM " . $tbl_admin_languages . " WHERE dokeos_folder = '" . Database::escape_string($language_path) . "')";
        $result = Database::query($sql_update);
        if (Database::num_rows($result) == 0) {
            return null;
        }
        $row = Database::fetch_array($result);
        return $row['dokeos_folder'];
    }

    /**
     * Get language matching isocode
     * @param   string  $isocode The language isocode (en, es, fr, zh-TW, etc)
     * @return  mixed  English name of the matching language, or false if no active language could be found
     */
    public static function getLanguageFromIsocode($isocode) {
        $isocode = Database::escape_string($isocode);
        $adminLanguagesTable = Database :: get_main_table(TABLE_MAIN_LANGUAGE);
        // select language - if case several languages match, get the last (more recent) one
        $sql = "SELECT english_name
                FROM " . $adminLanguagesTable . "
                WHERE isocode ='$isocode'
                    AND available = 1
                ORDER BY id
                DESC LIMIT 1";
        $res = Database::query($sql);
        if (Database::num_rows($res) < 1) {
            return false;
        }
        $row = Database::fetch_assoc($res);
        return $row['english_name'];
    }
    /**
     * Get best language in browser preferences
     * @param   string  $preferences The browser-configured language preferences (e.g. "en,es;q=0.7;en-us;q=0.3", etc)
     * @return  mixed  English name of the matching language, or false if no active language could be found
     */
    public static function getLanguageFromBrowserPreference($preferences) {
        if (empty($preferences)) {
            return false;
        }
        $preferencesArray = explode(',', $preferences);
        if (count($preferencesArray) > 0) {
            foreach ($preferencesArray as $pref) {
                $s = strpos($pref, ';');
                if ($s >= 2) {
                    $code = substr($pref, 0, $s);
                } else {
                    $code = $pref;
                }
                $name = self::getLanguageFromIsocode($code);
                if ($name !== false) {
                    return $name;
                }
            }
        }
        return false;
    }
}