<?php
/*
** Zabbix
** Copyright (C) 2001-2016 Zabbix SIA
**
** This program is free software; you can redistribute it and/or modify
** it under the terms of the GNU General Public License as published by
** the Free Software Foundation; either version 2 of the License, or
** (at your option) any later version.
**
** This program is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
** GNU General Public License for more details.
**
** You should have received a copy of the GNU General Public License
** along with this program; if not, write to the Free Software
** Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
**/


/**
 * Returns the names of supported event sources.
 *
 * If the $source parameter is passed, returns the name of the specific source, otherwise - returns an array of all
 * supported sources.
 *
 * @param int $source
 *
 * @return array|string
 */
function eventSource($source = null) {
	$sources = [
		EVENT_SOURCE_TRIGGERS => _('trigger'),
		EVENT_SOURCE_DISCOVERY => _('discovery'),
		EVENT_SOURCE_AUTO_REGISTRATION => _('auto registration'),
		EVENT_SOURCE_INTERNAL => _x('internal', 'event source')
	];

	if ($source === null) {
		return $sources;
	}
	elseif (isset($sources[$source])) {
		return $sources[$source];
	}
	else {
		return _('Unknown');
	}
}

/**
 * Returns the names of supported event objects.
 *
 * If the $source parameter is passed, returns the name of the specific object, otherwise - returns an array of all
 * supported objects.
 *
 * @param int $object
 *
 * @return array|string
 */
function eventObject($object = null) {
	$objects = [
		EVENT_OBJECT_TRIGGER => _('trigger'),
		EVENT_OBJECT_DHOST => _('discovered host'),
		EVENT_OBJECT_DSERVICE => _('discovered service'),
		EVENT_OBJECT_AUTOREGHOST => _('auto-registered host'),
		EVENT_OBJECT_ITEM => _('item'),
		EVENT_OBJECT_LLDRULE => _('low-level discovery rule')
	];

	if ($object === null) {
		return $objects;
	}
	elseif (isset($objects[$object])) {
		return $objects[$object];
	}
	else {
		return _('Unknown');
	}
}

/**
 * Returns all supported event source-object pairs.
 *
 * @return array
 */
function eventSourceObjects() {
	return [
		['source' => EVENT_SOURCE_TRIGGERS, 'object' => EVENT_OBJECT_TRIGGER],
		['source' => EVENT_SOURCE_DISCOVERY, 'object' => EVENT_OBJECT_DHOST],
		['source' => EVENT_SOURCE_DISCOVERY, 'object' => EVENT_OBJECT_DSERVICE],
		['source' => EVENT_SOURCE_AUTO_REGISTRATION, 'object' => EVENT_OBJECT_AUTOREGHOST],
		['source' => EVENT_SOURCE_INTERNAL, 'object' => EVENT_OBJECT_TRIGGER],
		['source' => EVENT_SOURCE_INTERNAL, 'object' => EVENT_OBJECT_ITEM],
		['source' => EVENT_SOURCE_INTERNAL, 'object' => EVENT_OBJECT_LLDRULE]
	];
}

function get_events_unacknowledged($db_element, $value_trigger = null, $value_event = null, $ack = false) {
	$elements = ['hosts' => [], 'hosts_groups' => [], 'triggers' => []];
	get_map_elements($db_element, $elements);

	if (empty($elements['hosts_groups']) && empty($elements['hosts']) && empty($elements['triggers'])) {
		return 0;
	}

	$config = select_config();
	$options = [
		'output' => ['triggerid'],
		'monitored' => 1,
		'skipDependent' => 1,
		'limit' => $config['search_limit'] + 1
	];
	if (!is_null($value_trigger)) {
		$options['filter'] = ['value' => $value_trigger];
	}
	if (!empty($elements['hosts_groups'])) {
		$options['groupids'] = array_unique($elements['hosts_groups']);
	}
	if (!empty($elements['hosts'])) {
		$options['hostids'] = array_unique($elements['hosts']);
	}
	if (!empty($elements['triggers'])) {
		$options['triggerids'] = array_unique($elements['triggers']);
	}
	$triggerids = API::Trigger()->get($options);

	return API::Event()->get([
		'source' => EVENT_SOURCE_TRIGGERS,
		'object' => EVENT_OBJECT_TRIGGER,
		'countOutput' => true,
		'objectids' => zbx_objectValues($triggerids, 'triggerid'),
		'filter' => [
			'value' => $value_event,
			'acknowledged' => $ack ? 1 : 0
		]
	]);
}

function get_next_event($currentEvent, array $eventList = []) {
	$nextEvent = false;

	foreach ($eventList as $event) {
		// check only the events belonging to the same object
		// find the event with the smallest eventid but greater than the current event id
		if ($event['object'] == $currentEvent['object'] && bccomp($event['objectid'], $currentEvent['objectid']) == 0
				&& (bccomp($event['eventid'], $currentEvent['eventid']) === 1
				&& (!$nextEvent || bccomp($event['eventid'], $nextEvent['eventid']) === -1))) {
			$nextEvent = $event;
		}
	}
	if ($nextEvent) {
		return $nextEvent;
	}

	$sql = 'SELECT e.*'.
			' FROM events e'.
			' WHERE e.source='.zbx_dbstr($currentEvent['source']).
				' AND e.object='.zbx_dbstr($currentEvent['object']).
				' AND e.objectid='.zbx_dbstr($currentEvent['objectid']).
				' AND e.clock>='.zbx_dbstr($currentEvent['clock']).
				' AND ((e.clock='.zbx_dbstr($currentEvent['clock']).' AND e.ns>'.$currentEvent['ns'].')'.
					' OR e.clock>'.zbx_dbstr($currentEvent['clock']).')'.
			' ORDER BY e.clock,e.eventid';
	return DBfetch(DBselect($sql, 1));
}

/**
 *
 * @param array  $event								An array of event data.
 * @param string $event['eventid']					Event ID.
 * @param string $event['correlationid']			OK Event correlation ID.
 * @param string $event['userid]					User ID who gerenerated the OK event.
 * @param array  $trigger							An array of trigger data.
 * @param string $backurl							A link back after acknowledgement has been clicked.
 *
 * @return CTableInfo
 */
function make_event_details($event, $trigger, $backurl) {
	$config = select_config();

	$table = (new CTableInfo())
		->addRow([
			_('Event'),
			CMacrosResolverHelper::resolveEventDescription(array_merge($trigger, $event))
		])
		->addRow([
			_('Time'),
			zbx_date2str(DATE_TIME_FORMAT_SECONDS, $event['clock'])
		]);

	if ($config['event_ack_enable'] && $event['value'] == TRIGGER_VALUE_TRUE) {
		// to make resulting link not have hint with acknowledges
		$event['acknowledges'] = count($event['acknowledges']);
		$table->addRow([_('Acknowledged'), getEventAckState($event, $backurl)]);
	}

	if ($event['value'] == TRIGGER_VALUE_FALSE) {
		if ($event['correlationid'] != 0) {
			$correlations = API::Correlation()->get([
				'output' => ['correlationid', 'name'],
				'correlationids' => [$event['correlationid']]
			]);

			if ($correlations) {
				if (CWebUser::getType() == USER_TYPE_SUPER_ADMIN) {
					$correlation_name = (new CLink($correlations[0]['name'],
						(new CUrl('correlation.php'))
							->setArgument('correlationid', $correlations[0]['correlationid'])
							->getUrl()
					))->addClass(ZBX_STYLE_LINK_ALT);
				}
				else {
					$correlation_name = $correlations[0]['name'];
				}
			}
			else {
				$correlation_name = _('Correlation rule');
			}

			$table->addRow([_('Generated by'), $correlation_name]);
		}
		elseif ($event['userid'] != 0) {
			if ($event['userid'] == CWebUser::$data['userid']) {
				$table->addRow([_('Generated by'), getUserFullname([
					'alias' => CWebUser::$data['alias'],
					'name' => CWebUser::$data['name'],
					'surname' => CWebUser::$data['surname']
				])]);
			}
			else {
				$user = API::User()->get([
					'output' => ['alias', 'name', 'surname'],
					'userids' => [$event['userid']]
				]);

				if ($user) {
					$table->addRow([_('Generated by'), getUserFullname($user[0])]);
				}
				else {
					$table->addRow([_('Generated by'), _('User')]);
				}
			}
		}
		else {
			$table->addRow([_('Generated by'), _('Trigger')]);
		}
	}

	$tags = makeEventsTags([$event]);

	$table->addRow([_('Tags'), $tags[$event['eventid']]]);

	return $table;
}

function make_small_eventlist($startEvent, $backurl) {
	$config = select_config();

	$table = (new CTableInfo())
		->setHeader([
			_('Time'),
			_('Status'),
			_('Duration'),
			_('Age'),
			$config['event_ack_enable'] ? _('Ack') : null, // if we need to chow acks
			_('Actions')
		]);

	$clock = $startEvent['clock'];

	$events = API::Event()->get([
		'source' => EVENT_SOURCE_TRIGGERS,
		'object' => EVENT_OBJECT_TRIGGER,
		'objectids' => $startEvent['objectid'],
		'eventid_till' => $startEvent['eventid'],
		'output' => ['eventid', 'source', 'object', 'objectid', 'clock', 'ns', 'value', 'acknowledged'],
		'select_acknowledges' => API_OUTPUT_COUNT,
		'sortfield' => ['clock', 'eventid'],
		'sortorder' => ZBX_SORT_DOWN,
		'limit' => 20
	]);

	$sortFields = [
		['field' => 'clock', 'order' => ZBX_SORT_DOWN],
		['field' => 'eventid', 'order' => ZBX_SORT_DOWN]
	];
	CArrayHelper::sort($events, $sortFields);

	$actions = makeEventsActions($events);

	foreach ($events as $index => $event) {
		$lclock = $clock;
		$duration = zbx_date2age($lclock, $event['clock']);
		$clock = $event['clock'];

		if (bccomp($startEvent['eventid'],$event['eventid']) == 0 && $nextevent = get_next_event($event, $events)) {
			$duration = zbx_date2age($nextevent['clock'], $clock);
		}
		elseif (bccomp($startEvent['eventid'], $event['eventid']) == 0) {
			$duration = zbx_date2age($clock);
		}

		$eventStatusSpan = new CSpan(trigger_value2str($event['value']));

		// add colors and blinking to span depending on configuration and trigger parameters
		addTriggerValueStyle(
			$eventStatusSpan,
			$event['value'],
			$event['clock'],
			$event['acknowledged']
		);

		$table->addRow([
			(new CLink(
				zbx_date2str(DATE_TIME_FORMAT_SECONDS, $event['clock']),
				'tr_events.php?triggerid='.$event['objectid'].'&eventid='.$event['eventid']))
				->addClass('action'),
			$eventStatusSpan,
			$duration,
			zbx_date2age($event['clock']),
			$config['event_ack_enable']
				? ($event['value'] == TRIGGER_VALUE_TRUE)
					? getEventAckState($event, $backurl)
					: ''
				: null,
			array_key_exists($index, $actions)
				? (new CCol($actions[$index]))->addClass(ZBX_STYLE_NOWRAP)
				: ''
		]);
	}

	return $table;
}

/**
 * Create table with trigger description and events.
 *
 * @param array  $trigger							An array of trigger data.
 * @param string $trigger['triggerid']				Trigger ID to select events.
 * @param string $trigger['description']			Trigger description.
 * @param string $trigger['url']					Trigger URL.
 * @param string $trigger['lastEvent']['eventid']	Last event ID
 * @param string $backurl							URL to return to.
 *
 * @return CDiv
 */
function make_popup_eventlist($trigger, $backurl) {
	// Show trigger description and URL.
	$div = (new CDiv());

	if ($trigger['comments'] !== '') {
		$div->addItem(
			(new CDiv())
				->addItem(zbx_str2links($trigger['comments']))
				->addClass(ZBX_STYLE_OVERLAY_DESCR)
		);
	}

	if ($trigger['url'] !== '') {
		$div->addItem(
			(new CDiv())
				->addItem(new CLink($trigger['url'], $trigger['url']))
				->addClass(ZBX_STYLE_OVERLAY_DESCR_URL)
		);
	}

	// Select and show events.
	$config = select_config();

	$table = new CTableInfo();

	// If acknowledges are turned on, we show 'ack' column.
	if ($config['event_ack_enable']) {
		$table->setHeader([_('Time'), _('Status'), _('Duration'), _('Age'), _('Ack')]);
	}
	else {
		$table->setHeader([_('Time'), _('Status'), _('Duration'), _('Age')]);
	}

	if ($trigger['lastEvent']) {
		$events = API::Event()->get([
			'source' => EVENT_SOURCE_TRIGGERS,
			'object' => EVENT_OBJECT_TRIGGER,
			'output' => API_OUTPUT_EXTEND,
			'objectids' => [$trigger['triggerid']],
			'eventid_till' => $trigger['lastEvent']['eventid'],
			'select_acknowledges' => API_OUTPUT_COUNT,
			'sortfield' => ['clock', 'eventid'],
			'sortorder' => ZBX_SORT_DOWN,
			'limit' => ZBX_WIDGET_ROWS
		]);

		$lclock = time();

		foreach ($events as $event) {
			$duration = zbx_date2age($lclock, $event['clock']);
			$lclock = $event['clock'];

			$eventStatusSpan = new CSpan(trigger_value2str($event['value']));

			// add colors and blinking to span depending on configuration and trigger parameters
			addTriggerValueStyle($eventStatusSpan, $event['value'], $event['clock'], $event['acknowledged']);

			$table->addRow([
				zbx_date2str(DATE_TIME_FORMAT_SECONDS, $event['clock']),
				$eventStatusSpan,
				$duration,
				zbx_date2age($event['clock']),
				$config['event_ack_enable'] ? getEventAckState($event, $backurl) : null
			]);
		}
	}

	$div->addItem($table);

	return $div;
}

/**
 * Create element with event acknowledges info.
 * If $event has subarray 'acknowledges', returned link will have hint with acknowledges.
 *
 * @param array			$event   event data
 * @param int			$event['acknowledged']
 * @param int			$event['eventid']
 * @param int			$event['objectid']
 * @param mixed			$event['acknowledges']
 * @param string		$backurl  add url param to link with current page file name
 *
 * @deprecated use makeEventsAcknowledges instead
 *
 * @return CLink
 */
function getEventAckState($event, $backurl) {
	if ($event['acknowledged'] == EVENT_ACKNOWLEDGED) {
		$acknowledges_num = is_array($event['acknowledges']) ? count($event['acknowledges']) : $event['acknowledges'];
	}

	$link = 'zabbix.php?action=acknowledge.edit&eventids[]='.$event['eventid'].'&backurl='.urlencode($backurl);

	if ($event['acknowledged'] == EVENT_ACKNOWLEDGED) {
		$ack = (new CLink(_('Yes'), $link))
			->addClass(ZBX_STYLE_LINK_ALT)
			->addClass(ZBX_STYLE_GREEN);
		if (is_array($event['acknowledges'])) {
			$ack->setHint(makeAckTab(array_slice($event['acknowledges'], 0, ZBX_WIDGET_ROWS)), '', false);
		}
		$ack = [$ack, CViewHelper::showNum($acknowledges_num)];
	}
	else {
		$ack = (new CLink(_('No'), $link))
			->addClass(ZBX_STYLE_LINK_ALT)
			->addClass(ZBX_STYLE_RED);
	}

	return $ack;
}

/**
 * Create element with event acknowledges info.
 *
 * @param array  $events
 * @param int    $events[]['eventid']
 * @param int    $events[]['objectid']
 * @param array  $events[]['acknowledges']
 * @param string $events[]['acknowledges'][]['userid']
 * @param int    $events[]['acknowledges'][]['clock']
 * @param string $events[]['acknowledges'][]['message']
 * @param string $events[]['acknowledges'][]['action']
 * @param string $backurl  add url param to link with current page file name
 *
 * @return array
 */
function makeEventsAcknowledges($events, $backurl) {
	$db_users = [];
	$userids = [];

	foreach ($events as &$event) {
		foreach ($event['acknowledges'] as $acknowledge) {
			$userids[$acknowledge['userid']] = true;
		}
		CArrayHelper::sort($event['acknowledges'], [['field' => 'clock', 'order' => ZBX_SORT_DOWN]]);
	}
	unset($event);

	if ($userids) {
		$db_users = API::User()->get([
			'output' => ['alias', 'name', 'surname'],
			'userids' => array_keys($userids),
			'preservekeys' => true
		]);
	}

	$acknowledges = [];

	foreach ($events as $event) {
		$link = 'zabbix.php?action=acknowledge.edit&eventids[]='.$event['eventid'].'&backurl='.urlencode($backurl);

		if ($event['acknowledges']) {
			$hint = makeAcknowledgesTable(array_slice($event['acknowledges'], 0, ZBX_WIDGET_ROWS), $db_users);
			$ack = (new CLink(_('Yes'), $link))
				->setHint($hint, '', false)
				->addClass(ZBX_STYLE_LINK_ALT)
				->addClass(ZBX_STYLE_GREEN);
			$acknowledges[$event['eventid']] = [$ack, CViewHelper::showNum(count($event['acknowledges']))];
		}
		else {
			$acknowledges[$event['eventid']] = (new CLink(_('No'), $link))
				->addClass(ZBX_STYLE_LINK_ALT)
				->addClass(ZBX_STYLE_RED);
		}
	}

	return $acknowledges;
}

/**
 * Get acknowledgement table.
 *
 * @param array  $acknowledges
 * @param string $acknowledges[]['userid']
 * @param int    $acknowledges[]['clock']
 * @param string $acknowledges[]['message']
 * @param string $acknowledges[]['action']
 *
 * @return CTableInfo
 */
function makeAcknowledgesTable($acknowledges, $users) {
	$table = (new CTableInfo())->setHeader([_('Time'), _('User'), _('Message'), _('User action')]);

	foreach ($acknowledges as $acknowledge) {
		$table->addRow([
			zbx_date2str(DATE_TIME_FORMAT_SECONDS, $acknowledge['clock']),
			array_key_exists($acknowledge['userid'], $users)
				? getUserFullname($users[$acknowledge['userid']])
				: _('Inaccessible user'),
			zbx_nl2br($acknowledge['message']),
			($acknowledge['action'] == ZBX_ACKNOWLEDGE_ACTION_CLOSE_PROBLEM) ? _('Close problem') : ''
		]);
	}

	return $table;
}

/**
 * Create element with event tags.
 *
 * @param array  $events
 * @param string $events[]['eventid']
 * @param array  $events[]['tags']
 * @param string $events[]['tags']['tag']
 * @param string $events[]['tags']['value']
 * @param bool   $html
 *
 * @return CTableInfo
 */
function makeEventsTags($events, $html = true) {
	$tags = [];

	foreach ($events as $event) {
		CArrayHelper::sort($event['tags'], ['tag', 'value']);

		$tags[$event['eventid']] = [];

		if ($html) {
			// Show first 3 tags and "..." with hint box if there are more.

			$tags_count = count($event['tags']);
			$tags_shown = array_slice($event['tags'], 0, EVENTS_LIST_TAGS_COUNT);

			foreach ($tags_shown as $tag) {
				$value = $tag['tag'].(($tag['value'] === '') ? '' : ': '.$tag['value']);
				$tags[$event['eventid']][] = (new CSpan($value))
					->addClass(ZBX_STYLE_TAG)
					->setHint($value);
			}

			if ($tags_count > count($tags_shown)) {
				// Display all tags in hint box.

				$hint_content = [];

				foreach ($event['tags'] as $tag) {
					$value = $tag['tag'].($tag['value'] === '' ? '' : ': '.$tag['value']);
					$hint_content[$event['eventid']][] = (new CSpan($value))
						->addClass(ZBX_STYLE_TAG)
						->setHint($value);
				}

				$tags[$event['eventid']][] = (new CSpan(
					(new CButton(null))
						->addClass(ZBX_STYLE_ICON_WZRD_ACTION)
						->setHint(new CDiv($hint_content), '', true, 'max-width: 500px')
					))->addClass(ZBX_STYLE_REL_CONTAINER);
			}
		}
		else {
			// Show all and uncut for CSV.

			foreach ($event['tags'] as $tag) {
				$value = $tag['tag'].(($tag['value'] === '') ? '' : ': '.$tag['value']);
				$tags[$event['eventid']][] = $value;
			}
		}
	}

	return $tags;
}

function getLastEvents($options) {
	if (!isset($options['limit'])) {
		$options['limit'] = 15;
	}

	$triggerOptions = [
		'filter' => [],
		'skipDependent' => 1,
		'selectHosts' => ['hostid', 'name'],
		'output' => API_OUTPUT_EXTEND,
		'sortfield' => 'lastchange',
		'sortorder' => ZBX_SORT_DOWN,
		'limit' => $options['triggerLimit']
	];

	$eventOptions = [
		'source' => EVENT_SOURCE_TRIGGERS,
		'object' => EVENT_OBJECT_TRIGGER,
		'output' => API_OUTPUT_EXTEND,
		'sortfield' => ['clock', 'eventid'],
		'sortorder' => ZBX_SORT_DOWN
	];

	if (isset($options['eventLimit'])) {
		$eventOptions['limit'] = $options['eventLimit'];
	}

	if (isset($options['priority'])) {
		$triggerOptions['filter']['priority'] = $options['priority'];
	}
	if (isset($options['monitored'])) {
		$triggerOptions['monitored'] = $options['monitored'];
	}
	if (isset($options['lastChangeSince'])) {
		$triggerOptions['lastChangeSince'] = $options['lastChangeSince'];
		$eventOptions['time_from'] = $options['lastChangeSince'];
	}
	if (isset($options['value'])) {
		$triggerOptions['filter']['value'] = $options['value'];
		$eventOptions['value'] = $options['value'];
	}

	// triggers
	$triggers = API::Trigger()->get($triggerOptions);
	$triggers = zbx_toHash($triggers, 'triggerid');

	// events
	$eventOptions['objectids'] = zbx_objectValues($triggers, 'triggerid');
	$events = API::Event()->get($eventOptions);

	$sortClock = [];
	$sortEvent = [];
	foreach ($events as $enum => $event) {
		if (!isset($triggers[$event['objectid']])) {
			continue;
		}

		$events[$enum]['trigger'] = $triggers[$event['objectid']];
		$events[$enum]['host'] = reset($events[$enum]['trigger']['hosts']);
		$sortClock[$enum] = $event['clock'];
		$sortEvent[$enum] = $event['eventid'];

		//expanding description for the state where event was
		$merged_event = array_merge($event, $triggers[$event['objectid']]);
		$events[$enum]['trigger']['description'] = CMacrosResolverHelper::resolveEventDescription($merged_event);
	}
	array_multisort($sortClock, SORT_DESC, $sortEvent, SORT_DESC, $events);

	return $events;
}
