<?php
/*
	Question2Answer by Gideon Greenspan and contributors
	http://www.question2answer.org/

	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.

	More about this license: http://www.question2answer.org/license.php
*/

namespace Q2A\Controllers\Admin;

use Q2A\Controllers\BaseController;
use Q2A\Database\DbConnection;
use Q2A\Middleware\Auth\MinimumUserLevel;

/**
 * Controller for admin page for editing widgets.
 */
class Widgets extends BaseController
{
	public function __construct(DbConnection $db)
	{
		require_once QA_INCLUDE_DIR . 'app/admin.php';
		require_once QA_INCLUDE_DIR . 'db/selects.php';

		parent::__construct($db);

		$this->addMiddleware(new MinimumUserLevel(QA_USER_LEVEL_ADMIN));
	}

	public function index()
	{
		// Get current list of widgets and determine the state of this admin page

		$widgetid = qa_post_text('edit');
		if (!strlen($widgetid))
			$widgetid = qa_get('edit');

		list($widgets, $pages) = qa_db_select_with_pending(
			qa_db_widgets_selectspec(),
			qa_db_pages_selectspec()
		);

		if (isset($widgetid)) {
			$editwidget = null;
			foreach ($widgets as $widget) {
				if ($widget['widgetid'] == $widgetid)
					$editwidget = $widget;
			}
		} else {
			$editwidget = array('title' => qa_post_text('title'));
			if (!isset($editwidget['title']))
				$editwidget['title'] = qa_get('title');
		}

		$module = qa_load_module('widget', @$editwidget['title']);

		$widgetfound = isset($module);


		// Check admin privileges (do late to allow one DB query)

		if (!qa_admin_check_privileges($qa_content))
			return $qa_content;


		// Define an array of relevant templates we can use

		$templatelangkeys = array(
			'question' => 'admin/question_pages',

			'qa' => 'main/recent_qs_as_title',
			'activity' => 'main/recent_activity_title',
			'questions' => 'admin/question_lists',
			'hot' => 'main/hot_qs_title',
			'unanswered' => 'main/unanswered_qs_title',

			'tags' => 'main/popular_tags',
			'categories' => 'misc/browse_categories',
			'users' => 'main/highest_users',
			'ask' => 'question/ask_title',

			'tag' => 'admin/tag_pages',
			'user' => 'admin/user_pages',
			'message' => 'misc/private_message_title',

			'search' => 'main/search_title',
			'feedback' => 'misc/feedback_title',

			'login' => 'users/login_title',
			'register' => 'users/register_title',
			'account' => 'profile/my_account_title',
			'favorites' => 'misc/my_favorites_title',
			'updates' => 'misc/recent_updates_title',

			'ip' => 'admin/ip_address_pages',
			'admin' => 'admin/admin_title',
		);

		$templateoptions = array();

		if (isset($module) && method_exists($module, 'allow_template')) {
			foreach ($templatelangkeys as $template => $langkey) {
				if ($module->allow_template($template))
					$templateoptions[$template] = qa_lang_html($langkey);
			}

			if ($module->allow_template('custom')) {
				$pagemodules = qa_load_modules_with('page', 'match_request');
				foreach ($pages as $page) {
					// check if this is a page plugin by fetching all plugin classes and matching requests - currently quite convoluted!
					$isPagePlugin = false;
					foreach ($pagemodules as $pagemodule) {
						if ($pagemodule->match_request($page['tags'])) {
							$isPagePlugin = true;
						}
					}

					if ($isPagePlugin || !($page['flags'] & QA_PAGE_FLAGS_EXTERNAL))
						$templateoptions['custom-' . $page['pageid']] = qa_html($page['title']);
				}
			}
		}


		// Process saving an old or new widget

		$securityexpired = false;

		if (qa_clicked('docancel')) {
			qa_redirect('admin/layout');
		} elseif (qa_clicked('dosavewidget')) {
			require_once QA_INCLUDE_DIR . 'db/admin.php';

			if (!qa_check_form_security_code('admin/widgets', qa_post_text('code'))) {
				$securityexpired = true;
			} else {
				if (qa_post_text('dodelete')) {
					qa_db_widget_delete($editwidget['widgetid']);
					qa_redirect('admin/layout');
				} else {
					if ($widgetfound) {
						$intitle = qa_post_text('title');
						$inposition = qa_post_text('position');
						$intemplates = array();

						if (qa_post_text('template_all'))
							$intemplates[] = 'all';

						foreach (array_keys($templateoptions) as $template) {
							if (qa_post_text('template_' . $template))
								$intemplates[] = $template;
						}

						$intags = implode(',', $intemplates);

						// Perform appropriate database action

						if (isset($editwidget['widgetid'])) { // changing existing widget
							$widgetid = $editwidget['widgetid'];
							qa_db_widget_set_fields($widgetid, $intags);
						} else
							$widgetid = qa_db_widget_create($intitle, $intags);

						qa_db_widget_move($widgetid, substr($inposition, 0, 2), substr($inposition, 2));
					}

					qa_redirect('admin/layout');
				}
			}
		}


		// Prepare content for theme

		$qa_content = qa_content_prepare();

		$qa_content['title'] = qa_lang_html('admin/admin_title') . ' - ' . qa_lang_html('admin/layout_title');
		$qa_content['error'] = $securityexpired ? qa_lang_html('admin/form_security_expired') : qa_admin_page_error();

		$positionoptions = array();

		$placeoptionhtml = qa_admin_place_options();

		$regioncodes = array(
			'F' => 'full',
			'M' => 'main',
			'S' => 'side',
		);

		foreach ($placeoptionhtml as $place => $optionhtml) {
			$region = $regioncodes[substr($place, 0, 1)];

			$widgetallowed = method_exists($module, 'allow_region') && $module->allow_region($region);

			if ($widgetallowed) {
				foreach ($widgets as $widget) {
					if ($widget['place'] == $place && $widget['title'] == $editwidget['title'] && $widget['widgetid'] !== @$editwidget['widgetid'])
						$widgetallowed = false; // don't allow two instances of same widget in same place
				}
			}

			if ($widgetallowed) {
				$previous = null;
				$passedself = false;
				$maxposition = 0;

				foreach ($widgets as $widget) {
					if ($widget['place'] == $place) {
						$positionhtml = $optionhtml;

						if (isset($previous))
							$positionhtml .= ' - ' . qa_lang_html_sub('admin/after_x', qa_html($passedself ? $widget['title'] : $previous['title']));

						if ($widget['widgetid'] == @$editwidget['widgetid'])
							$passedself = true;

						$maxposition = max($maxposition, $widget['position']);
						$positionoptions[$place . $widget['position']] = $positionhtml;

						$previous = $widget;
					}
				}

				if (!isset($editwidget['widgetid']) || $place != @$editwidget['place']) {
					$positionhtml = $optionhtml;

					if (isset($previous))
						$positionhtml .= ' - ' . qa_lang_html_sub('admin/after_x', $previous['title']);

					$positionoptions[$place . (isset($previous) ? (1 + $maxposition) : 1)] = $positionhtml;
				}
			}
		}

		$positionvalue = @$positionoptions[$editwidget['place'] . $editwidget['position']];

		$qa_content['form'] = array(
			'tags' => 'method="post" action="' . qa_path_html(qa_request()) . '"',

			'style' => 'tall',

			'fields' => array(
				'title' => array(
					'label' => qa_lang_html('admin/widget_name') . ' &nbsp; ' . qa_html($editwidget['title']),
					'type' => 'static',
					'tight' => true,
				),

				'position' => array(
					'id' => 'position_display',
					'tags' => 'name="position"',
					'label' => qa_lang_html('admin/position'),
					'type' => 'select',
					'options' => $positionoptions,
					'value' => $positionvalue,
				),

				'delete' => array(
					'tags' => 'name="dodelete" id="dodelete"',
					'label' => qa_lang_html('admin/delete_widget_position'),
					'value' => 0,
					'type' => 'checkbox',
				),

				'all' => array(
					'id' => 'all_display',
					'label' => qa_lang_html('admin/widget_all_pages'),
					'type' => 'checkbox',
					'tags' => 'name="template_all" id="template_all"',
					'value' => is_numeric(strpos(',' . @$editwidget['tags'] . ',', ',all,')),
				),

				'templates' => array(
					'id' => 'templates_display',
					'label' => qa_lang_html('admin/widget_pages_explanation'),
					'type' => 'custom',
					'html' => '',
				),
			),

			'buttons' => array(
				'save' => array(
					'label' => qa_lang_html(isset($editwidget['widgetid']) ? 'main/save_button' : ('admin/add_widget_button')),
				),

				'cancel' => array(
					'tags' => 'name="docancel"',
					'label' => qa_lang_html('main/cancel_button'),
				),
			),

			'hidden' => array(
				'dosavewidget' => '1', // for IE
				'edit' => @$editwidget['widgetid'],
				'title' => @$editwidget['title'],
				'code' => qa_get_form_security_code('admin/widgets'),
			),
		);

		foreach ($templateoptions as $template => $optionhtml) {
			$qa_content['form']['fields']['templates']['html'] .=
				'<input type="checkbox" name="template_' . qa_html($template) . '"' .
				(is_numeric(strpos(',' . @$editwidget['tags'] . ',', ',' . $template . ',')) ? ' checked' : '') .
				'/> ' . $optionhtml . '<br/>';
		}

		if (isset($editwidget['widgetid'])) {
			qa_set_display_rules($qa_content, array(
				'templates_display' => '!(dodelete||template_all)',
				'all_display' => '!dodelete',
			));
		} else {
			unset($qa_content['form']['fields']['delete']);
			qa_set_display_rules($qa_content, array(
				'templates_display' => '!template_all',
			));
		}

		if (!$widgetfound) {
			unset($qa_content['form']['fields']['title']['tight']);
			$qa_content['form']['fields']['title']['error'] = qa_lang_html('admin/widget_not_available');
			unset($qa_content['form']['fields']['position']);
			unset($qa_content['form']['fields']['all']);
			unset($qa_content['form']['fields']['templates']);
			if (!isset($editwidget['widgetid']))
				unset($qa_content['form']['buttons']['save']);
		} elseif (!count($positionoptions)) {
			unset($qa_content['form']['fields']['title']['tight']);
			$qa_content['form']['fields']['title']['error'] = qa_lang_html('admin/widget_no_positions');
			unset($qa_content['form']['fields']['position']);
			unset($qa_content['form']['fields']['all']);
			unset($qa_content['form']['fields']['templates']);
			unset($qa_content['form']['buttons']['save']);
		}

		$qa_content['navigation']['sub'] = qa_admin_sub_navigation();


		return $qa_content;
	}
}