<?php
/*
** Zabbix
** Copyright (C) 2001-2021 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.
**/


class CFilter extends CDiv {

	// Filter form object.
	private $form;
	// Filter form object name and id attribute.
	private $name = 'zbx_filter';
	// Visibility of 'Apply', 'Reset' form buttons. Visibility is set to all tabs.
	private $show_buttons = true;

	/**
	 * Filter page URL.
	 *
	 * @var object
	 */
	private $url;

	// Array of filter tab headers. Every header is mapped to it content via href(header) and id(content) attribute.
	protected $headers = [];
	// Array of filter tab content.
	protected $tabs = [];
	// jQuery.tabs initialization options.
	protected $tabs_options = [
		'collapsible' => true,
		'active' => false
	];
	// Profile data associated with filter object.
	protected $idx = null;
	protected $idx2 = 0;

	/**
	 * List of predefined time ranges.
	 */
	protected $time_ranges = [
		[
			['now-2d', 'now'],
			['now-7d', 'now'],
			['now-30d', 'now'],
			['now-3M', 'now'],
			['now-6M', 'now'],
			['now-1y', 'now'],
			['now-2y', 'now']
		],
		[
			['now-1d/d', 'now-1d/d'],
			['now-2d/d', 'now-2d/d'],
			['now-1w/d', 'now-1w/d'],
			['now-1w/w', 'now-1w/w'],
			['now-1M/M', 'now-1M/M'],
			['now-1y/y', 'now-1y/y']
		],
		[
			['now/d', 'now/d'],
			['now/d', 'now'],
			['now/w', 'now/w'],
			['now/w', 'now'],
			['now/M', 'now/M'],
			['now/M', 'now'],
			['now/y', 'now/y'],
			['now/y', 'now']
		],
		[
			['now-5m', 'now'],
			['now-15m', 'now'],
			['now-30m', 'now'],
			['now-1h', 'now'],
			['now-3h', 'now'],
			['now-6h', 'now'],
			['now-12h', 'now'],
			['now-24h', 'now']
		]
	];

	public function __construct(CUrl $url) {
		parent::__construct();

		$this->url = $url;

		$this
			->setAttribute('data-accessible', 1)
			->addClass('filter-space')
			->setId(uniqid('filter_'));

		$this->form = (new CForm('get'))
			->cleanItems()
			->setAttribute('name', $this->name);
	}

	public function getName() {
		return $this->name;
	}

	/**
	 * Add variable to filter form.
	 *
	 * @param string $name      Variable name.
	 * @param string $value     Variable value.
	 *
	 * @return CFilter
	 */
	public function addVar($name, $value) {
		$this->form->addVar($name, $value);

		return $this;
	}

	/**
	 * Hide filter tab buttons. Should be called before addFilterTab.
	 */
	public function hideFilterButtons() {
		$this->show_buttons = false;

		return $this;
	}

	/**
	 * Set profile 'idx' and 'idx2' data.
	 *
	 * @param string $idx     Profile 'idx' string.
	 * @param int    $idx2    Profile 'idx2' identifier, default 0.
	 *
	 * @return CFilter
	 */
	public function setProfile($idx, $idx2 = 0) {
		$this->idx = $idx;
		$this->idx2 = $idx2;

		$this->setAttribute('data-profile-idx', $idx);
		$this->setAttribute('data-profile-idx2', $idx2);

		return $this;
	}

	/**
	 * Adds an item inside the form object.
	 *
	 * @param mixed $item  An item to add inside the form object.
	 *
	 * @return CFilter
	 */
	public function addFormItem($item) {
		$this->form->addItem($item);

		return $this;
	}

	/**
	 * Set active tab.
	 *
	 * @param int $tab  1 based index of active tab. If set to 0 all tabs will be collapsed.
	 *
	 * @return CFilter
	 */
	public function setActiveTab($tab) {
		$this->tabs_options['active'] = $tab > 0 ? $tab - 1 : false;

		return $this;
	}

	/**
	 * Add tab with filter form.
	 *
	 * @param string $header    Tab header title string.
	 * @param array  $columns   Array of filter columns markup.
	 * @param array  $footer    Additional markup objects for filter tab, default null.
	 *
	 * @return CFilter
	 */
	public function addFilterTab($header, $columns, $footer = null) {
		$row = (new CDiv())->addClass(ZBX_STYLE_ROW);
		$body = [];
		$anchor = 'tab_'.count($this->tabs);

		foreach ($columns as $column) {
			$row->addItem((new CDiv($column))->addClass(ZBX_STYLE_CELL));
		}

		$body[] = (new CDiv())
			->addClass(ZBX_STYLE_TABLE)
			->addClass(ZBX_STYLE_FILTER_FORMS)
			->addItem($row);

		if ($this->show_buttons) {
			$body[] = (new CDiv())
				->addClass(ZBX_STYLE_FILTER_FORMS)
				->addItem(
					(new CSubmitButton(_('Apply'), 'filter_set', 1))
						->onClick('javascript: chkbxRange.clearSelectedOnFilterChange();')
				)
				->addItem(
					(new CRedirectButton(_('Reset'),
						$this->url
							->setArgument('filter_rst', 1)
							->getUrl()
					))
						->addClass(ZBX_STYLE_BTN_ALT)
						->onClick('javascript: chkbxRange.clearSelectedOnFilterChange();')
				);
		}

		if ($footer !== null) {
			$body[] = $footer;
		}

		return $this->addTab(
			(new CLink($header, '#'.$anchor))->addClass(ZBX_STYLE_FILTER_TRIGGER),
			(new CDiv($body))
				->addClass(ZBX_STYLE_FILTER_CONTAINER)
				->setId($anchor)
		);
	}

	/**
	 * Add time selector specific tab. Should be called before any tab is added. Adds two tabs:
	 * - time selector range change buttons: back, zoom out, forward.
	 * - time selector range change form with predefined ranges.
	 *
	 * @param string $from    Start date. (can be in relative time format, example: now-1w)
	 * @param string $to      End date. (can be in relative time format, example: now-1w)
	 * @param bool   $visible Either to make time selector visible or hidden.
	 * @param string $format  Date and time format used in CDateSelector.
	 *
	 * @return CFilter
	 */
	public function addTimeSelector($from, $to, $visible = true, $format = ZBX_FULL_DATE_TIME) {
		$header = relativeDateToText($from, $to);

		if ($visible) {
			$this->addTab(new CDiv([
				(new CSimpleButton())->addClass(ZBX_STYLE_BTN_TIME_LEFT),
				(new CSimpleButton(_('Zoom out')))->addClass(ZBX_STYLE_BTN_TIME_OUT),
				(new CSimpleButton())->addClass(ZBX_STYLE_BTN_TIME_RIGHT)
			]), null);

			$predefined_ranges = [];

			foreach ($this->time_ranges as $column_ranges) {
				$column = (new CList())->addClass(ZBX_STYLE_TIME_QUICK);

				foreach ($column_ranges as $range) {
					$label = relativeDateToText($range[0], $range[1]);
					$is_selected = ($header === $label);

					$column->addItem((new CLink($label))
						->setAttribute('data-from', $range[0])
						->setAttribute('data-to', $range[1])
						->setAttribute('data-label', $label)
						->addClass($is_selected ? ZBX_STYLE_SELECTED : null)
					);
				}

				$predefined_ranges[] = (new CDiv($column))->addClass(ZBX_STYLE_CELL);
			}

			$anchor = 'tab_'.count($this->tabs);

			$this->addTab(
				(new CLink($header, '#'.$anchor))->addClass(ZBX_STYLE_BTN_TIME),
				(new CDiv([
					(new CDiv([
						new CList([
							new CLabel(_('From'), 'from'),
							(new CDateSelector('from', $from))->setDateFormat($format)
						]),
						(new CList([(new CListItem(''))->addClass(ZBX_STYLE_RED)]))
							->setAttribute('data-error-for', 'from')
							->addClass(ZBX_STYLE_TIME_INPUT_ERROR)
							->addStyle('display: none'),
						new CList([
							new CLabel(_('To'), 'to'),
							(new CDateSelector('to', $to))->setDateFormat($format)
						]),
						(new CList([(new CListItem(''))->addClass(ZBX_STYLE_RED)]))
							->setAttribute('data-error-for', 'to')
							->addClass(ZBX_STYLE_TIME_INPUT_ERROR)
							->addStyle('display: none'),
						new CList([
							new CButton('apply', _('Apply'))
						])
					]))->addClass(ZBX_STYLE_TIME_INPUT),
					(new CDiv($predefined_ranges))->addClass(ZBX_STYLE_TIME_QUICK_RANGE)
				]))
					->addClass(ZBX_STYLE_FILTER_CONTAINER)
					->addClass(ZBX_STYLE_TIME_SELECTION_CONTAINER)
					->setId($anchor)
			);
		}
		else {
			$this
				->setAttribute('data-accessible', 0)
				->addTab(null, (new CDiv([
					new CVar('from', $from),
					new CVar('to', $to)
				])));
		}

		return $this;
	}

	/**
	 * Add tab.
	 *
	 * @param string|CTag $header    Tab header title string or CTag container.
	 * @param array       $body      Array of body elements.
	 *
	 * @return CFilter
	 */
	public function addTab($header, $body) {
		$this->headers[] = $header;
		$this->tabs[] = $body;

		return $this;
	}

	/**
	 * Return javascript code for jquery-ui initialization.
	 *
	 * @return string
	 */
	private function getJS() {
		$id = '#'.$this->getId();

		$js = 'jQuery("'.$id.'").tabs('.CJs::encodeJson($this->tabs_options).').show();';

		// Set the focus to a field with autofocus after the filter becomes visible.
		$js .= 'jQuery("[autofocus=autofocus]", jQuery("'.$id.'")).filter(":visible").focus();';

		if ($this->idx !== null && $this->idx !== '') {
			$js .= 'jQuery("'.$id.'").on("tabsactivate", function(e, ui) {'.
				'var active = ui.newPanel.length ? jQuery(this).tabs("option", "active") + 1 : 0;'.
				'updateUserProfile("'.$this->idx.'.active", active, []);'.

				'if (active) {'.
					'jQuery("[autofocus=autofocus]", ui.newPanel).focus();'.
				'}'.
			'});';
		}

		return $js;
	}

	/**
	 * Render current CFilter object as HTML string.
	 *
	 * @return string
	 */
	public function toString($destroy = true) {
		$headers = (new CList())->addClass(ZBX_STYLE_FILTER_BTN_CONTAINER);
		$headers_cnt = 0;

		if ($this->tabs_options['active'] !== false
				&& !array_key_exists($this->tabs_options['active'], $this->headers)) {
			$this->tabs_options['active'] = 0;
		}

		foreach ($this->headers as $index => $header) {
			if ($header) {
				$headers->addItem($header);
				$headers_cnt++;
			}

			if ($this->tabs[$index] !== null && $index !== $this->tabs_options['active']) {
				$this->tabs[$index]->addStyle('display: none');
			}
		}

		$this
			->addStyle('display:none')
			->form->addItem($this->tabs);

		if ($headers_cnt) {
			$this
				->addItem($headers)
				->setAttribute('aria-label', _('Filter'));
		}

		$this->addItem($this->form);

		return parent::toString($destroy).($headers_cnt ? get_js($this->getJS()) : '');
	}
}
