<?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 custom pages and external links.
 */
class Pages extends BaseController
{
	public function __construct(DbConnection $db)
	{
		require_once QA_INCLUDE_DIR . 'app/admin.php';
		require_once QA_INCLUDE_DIR . 'app/format.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 pages and determine the state of this admin page

		$pageid = qa_post_text('edit');
		if (!isset($pageid))
			$pageid = qa_get('edit');

		list($pages, $editpage) = qa_db_select_with_pending(
			qa_db_pages_selectspec(),
			isset($pageid) ? qa_db_page_full_selectspec($pageid, true) : null
		);

		if ((qa_clicked('doaddpage') || qa_clicked('doaddlink') || qa_get('doaddlink') || qa_clicked('dosavepage')) && !isset($editpage)) {
			$editpage = array('title' => qa_get('text'), 'tags' => qa_get('url'), 'nav' => qa_get('nav'), 'position' => 1);
			$isexternal = qa_clicked('doaddlink') || qa_get('doaddlink') || qa_post_text('external');
		} elseif (isset($editpage)) {
			$isexternal = $editpage['flags'] & QA_PAGE_FLAGS_EXTERNAL;
		}


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

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


		// Define an array of navigation settings we can change, option name => language key

		$hascustomhome = qa_has_custom_home();

		$navoptions = array(
			'nav_home' => 'main/nav_home',
			'nav_activity' => 'main/nav_activity',
			$hascustomhome ? 'nav_qa_not_home' : 'nav_qa_is_home' => $hascustomhome ? 'main/nav_qa' : 'admin/nav_qa_is_home',
			'nav_questions' => 'main/nav_qs',
			// 'nav_hot' => 'main/nav_hot',
			// 'nav_unanswered' => 'main/nav_unanswered',
			'nav_tags' => 'main/nav_tags',
			'nav_categories' => 'main/nav_categories',
			'nav_users' => 'main/nav_users',
			'nav_ask' => 'main/nav_ask',
		);

		$navpaths = array(
			'nav_home' => '',
			'nav_activity' => 'activity',
			'nav_qa_not_home' => 'qa',
			'nav_qa_is_home' => '',
			'nav_questions' => 'questions',
			// 'nav_hot' => 'hot',
			// 'nav_unanswered' => 'unanswered',
			'nav_tags' => 'tags',
			'nav_categories' => 'categories',
			'nav_users' => 'users',
			'nav_ask' => 'ask',
		);

		if (!qa_opt('show_custom_home'))
			unset($navoptions['nav_home']);

		if (!qa_using_categories())
			unset($navoptions['nav_categories']);

		if (!qa_using_tags())
			unset($navoptions['nav_tags']);


		// Process saving an old or new page

		$securityexpired = false;

		if (qa_clicked('docancel')) {
			$editpage = null;
		} elseif (qa_clicked('dosaveoptions') || qa_clicked('doaddpage') || qa_clicked('doaddlink')) {
			if (!qa_check_form_security_code('admin/pages', qa_post_text('code')))
				$securityexpired = true;
			else foreach ($navoptions as $optionname => $langkey)
				qa_set_option($optionname, (int)qa_post_text('option_' . $optionname));
		} elseif (qa_clicked('dosavepage')) {
			require_once QA_INCLUDE_DIR . 'db/admin.php';
			require_once QA_INCLUDE_DIR . 'util/string.php';

			if (!qa_check_form_security_code('admin/pages', qa_post_text('code'))) {
				$securityexpired = true;
			} else {
				$reloadpages = false;

				if (qa_post_text('dodelete')) {
					qa_db_page_delete($editpage['pageid']);

					$searchmodules = qa_load_modules_with('search', 'unindex_page');
					foreach ($searchmodules as $searchmodule)
						$searchmodule->unindex_page($editpage['pageid']);

					$editpage = null;
					$reloadpages = true;
				} else {
					$inname = qa_post_text('name');
					$inposition = qa_post_text('position');
					$inpermit = (int)qa_post_text('permit');
					$inurl = qa_post_text('url');
					$innewwindow = qa_post_text('newwindow');
					$inheading = qa_post_text('heading');
					$incontent = qa_post_text('content');

					$errors = array();

					// Verify the name (navigation link) is legitimate
					if (empty($inname))
						$errors['name'] = qa_lang('main/field_required');
					elseif (qa_strlen($inname) > QA_DB_MAX_CAT_PAGE_TITLE_LENGTH)
						$errors['name'] = qa_lang_sub('main/max_length_x', QA_DB_MAX_CAT_PAGE_TITLE_LENGTH);

					if ($isexternal) {
						// Verify the url is legitimate (vaguely)
						if (empty($inurl))
							$errors['url'] = qa_lang('main/field_required');
						elseif (qa_strlen($inurl) > QA_DB_MAX_CAT_PAGE_TAGS_LENGTH)
							$errors['url'] = qa_lang_sub('main/max_length_x', QA_DB_MAX_CAT_PAGE_TAGS_LENGTH);
					} else {
						// Verify the heading is legitimate
						if (qa_strlen($inheading) > QA_DB_MAX_TITLE_LENGTH)
							$errors['heading'] = qa_lang_sub('main/max_length_x', QA_DB_MAX_TITLE_LENGTH);

						// Verify the slug is legitimate (and try some defaults if we're creating a new page, and it's not)
						for ($attempt = 0; $attempt < 100; $attempt++) {
							switch ($attempt) {
								case 0:
									$inslug = qa_post_text('slug');
									if (!isset($inslug))
										$inslug = implode('-', qa_string_to_words($inname));
									break;

								case 1:
									$inslug = qa_lang_sub('admin/page_default_slug', $inslug);
									break;

								default:
									$inslug = qa_lang_sub('admin/page_default_slug', $attempt - 1);
									break;
							}

							list($matchcategoryid, $matchpage) = qa_db_select_with_pending(
								qa_db_slugs_to_category_id_selectspec($inslug),
								qa_db_page_full_selectspec($inslug, false)
							);

							if (empty($inslug))
								$errors['slug'] = qa_lang('main/field_required');
							elseif (qa_strlen($inslug) > QA_DB_MAX_CAT_PAGE_TAGS_LENGTH)
								$errors['slug'] = qa_lang_sub('main/max_length_x', QA_DB_MAX_CAT_PAGE_TAGS_LENGTH);
							elseif (preg_match('/[\\+\\/]/', $inslug))
								$errors['slug'] = qa_lang_sub('admin/slug_bad_chars', '+ /');
							elseif (qa_admin_is_slug_reserved($inslug))
								$errors['slug'] = qa_lang('admin/slug_reserved');
							elseif (isset($matchpage) && ($matchpage['pageid'] != @$editpage['pageid']))
								$errors['slug'] = qa_lang('admin/page_already_used');
							elseif (isset($matchcategoryid))
								$errors['slug'] = qa_lang('admin/category_already_used');
							else
								unset($errors['slug']);

							if (isset($editpage['pageid']) || !isset($errors['slug'])) // don't try other options if editing existing page
								break;
						}
					}

					// Perform appropriate database action

					if (isset($editpage['pageid'])) { // changing existing page
						$title = isset($errors['name']) ? $editpage['title'] : $inname;

						if ($isexternal) {
							qa_db_page_set_fields(
								$editpage['pageid'],
								$title,
								QA_PAGE_FLAGS_EXTERNAL | ($innewwindow ? QA_PAGE_FLAGS_NEW_WINDOW : 0),
								isset($errors['url']) ? $editpage['tags'] : $inurl,
								null,
								null,
								$inpermit
							);
						} else {
							$setheading = isset($errors['heading']) ? $editpage['heading'] : $inheading;
							$setslug = isset($errors['slug']) ? $editpage['tags'] : $inslug;
							$setcontent = isset($errors['content']) ? $editpage['content'] : $incontent;

							qa_db_page_set_fields($editpage['pageid'], $title, 0, $setslug, $setheading, $setcontent, $inpermit);

							$searchmodules = qa_load_modules_with('search', 'unindex_page');
							foreach ($searchmodules as $searchmodule)
								$searchmodule->unindex_page($editpage['pageid']);

							$indextext = qa_viewer_text($setcontent, 'html');

							$searchmodules = qa_load_modules_with('search', 'index_page');
							foreach ($searchmodules as $searchmodule)
								$searchmodule->index_page($editpage['pageid'], $setslug, $setheading, $setcontent, 'html', $indextext);
						}

						qa_db_page_move($editpage['pageid'], substr($inposition, 0, 1), substr($inposition, 1));

						$reloadpages = true;

						if (empty($errors))
							$editpage = null;
						else
							$editpage = @$pages[$editpage['pageid']];
					} else { // creating a new one
						if (empty($errors)) {
							if ($isexternal) {
								$pageid = qa_db_page_create($inname, QA_PAGE_FLAGS_EXTERNAL | ($innewwindow ? QA_PAGE_FLAGS_NEW_WINDOW : 0), $inurl, null, null, $inpermit);
							} else {
								$pageid = qa_db_page_create($inname, 0, $inslug, $inheading, $incontent, $inpermit);

								$indextext = qa_viewer_text($incontent, 'html');

								$searchmodules = qa_load_modules_with('search', 'index_page');
								foreach ($searchmodules as $searchmodule)
									$searchmodule->index_page($pageid, $inslug, $inheading, $incontent, 'html', $indextext);
							}

							qa_db_page_move($pageid, substr($inposition, 0, 1), substr($inposition, 1));

							$editpage = null;
							$reloadpages = true;
						}
					}

					if (qa_clicked('dosaveview') && empty($errors) && !$isexternal)
						qa_redirect($inslug);
				}

				if ($reloadpages) {
					qa_db_flush_pending_result('navpages');
					$pages = qa_db_select_with_pending(qa_db_pages_selectspec());
				}
			}
		}


		// Prepare content for theme

		$qa_content = qa_content_prepare();

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

		if (isset($editpage)) {
			$positionoptions = array();

			if (!$isexternal)
				$positionoptions['_' . max(1, @$editpage['position'])] = qa_lang_html('admin/no_link');

			$navlangkey = array(
				'B' => 'admin/before_main_menu',
				'M' => 'admin/after_main_menu',
				'O' => 'admin/opposite_main_menu',
				'F' => 'admin/after_footer',
			);

			foreach ($navlangkey as $nav => $langkey) {
				$previous = null;
				$passedself = false;
				$maxposition = 0;

				foreach ($pages as $key => $page) {
					if ($page['nav'] == $nav) {
						if (isset($previous))
							$positionhtml = qa_lang_html_sub('admin/after_x_tab', qa_html($passedself ? $page['title'] : $previous['title']));
						else
							$positionhtml = qa_lang_html($langkey);

						if ($page['pageid'] == @$editpage['pageid'])
							$passedself = true;

						$maxposition = max($maxposition, $page['position']);
						$positionoptions[$nav . $page['position']] = $positionhtml;

						$previous = $page;
					}
				}

				if (!isset($editpage['pageid']) || $nav != @$editpage['nav']) {
					$positionvalue = isset($previous) ? qa_lang_html_sub('admin/after_x_tab', qa_html($previous['title'])) : qa_lang_html($langkey);
					$positionoptions[$nav . (isset($previous) ? (1 + $maxposition) : 1)] = $positionvalue;
				}
			}

			$positionvalue = @$positionoptions[$editpage['nav'] . $editpage['position']];

			$permitoptions = qa_admin_permit_options(QA_PERMIT_ALL, QA_PERMIT_ADMINS, false, false);
			$permitvalue = @$permitoptions[isset($inpermit) ? $inpermit : $editpage['permit']];

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

				'style' => 'tall',

				'fields' => array(
					'name' => array(
						'tags' => 'name="name" id="name"',
						'label' => qa_lang_html($isexternal ? 'admin/link_name' : 'admin/page_name'),
						'value' => qa_html(isset($inname) ? $inname : @$editpage['title']),
						'error' => qa_html(@$errors['name']),
					),

					'delete' => array(
						'tags' => 'name="dodelete" id="dodelete"',
						'label' => qa_lang_html($isexternal ? 'admin/delete_link' : 'admin/delete_page'),
						'value' => 0,
						'type' => 'checkbox',
					),

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

					'permit' => array(
						'id' => 'permit_display',
						'tags' => 'name="permit"',
						'label' => qa_lang_html('admin/permit_to_view'),
						'type' => 'select',
						'options' => $permitoptions,
						'value' => $permitvalue,
					),

					'slug' => array(
						'id' => 'slug_display',
						'tags' => 'name="slug"',
						'label' => qa_lang_html('admin/page_slug'),
						'value' => qa_html(isset($inslug) ? $inslug : @$editpage['tags']),
						'error' => qa_html(@$errors['slug']),
					),

					'url' => array(
						'id' => 'url_display',
						'tags' => 'name="url"',
						'label' => qa_lang_html('admin/link_url'),
						'value' => qa_html(isset($inurl) ? $inurl : @$editpage['tags']),
						'error' => qa_html(@$errors['url']),
					),

					'newwindow' => array(
						'id' => 'newwindow_display',
						'tags' => 'name="newwindow"',
						'label' => qa_lang_html('admin/link_new_window'),
						'value' => (isset($innewwindow) ? $innewwindow : (@$editpage['flags'] & QA_PAGE_FLAGS_NEW_WINDOW)) ? 1 : 0,
						'type' => 'checkbox',
					),

					'heading' => array(
						'id' => 'heading_display',
						'tags' => 'name="heading"',
						'label' => qa_lang_html('admin/page_heading'),
						'value' => qa_html(isset($inheading) ? $inheading : @$editpage['heading']),
						'error' => qa_html(@$errors['heading']),
					),

					'content' => array(
						'id' => 'content_display',
						'tags' => 'name="content"',
						'label' => qa_lang_html('admin/page_content_html'),
						'value' => qa_html(isset($incontent) ? $incontent : @$editpage['content']),
						'error' => qa_html(@$errors['content']),
						'rows' => 16,
					),
				),

				'buttons' => array(
					'save' => array(
						'label' => qa_lang_html(isset($editpage['pageid']) ? 'main/save_button' : ($isexternal ? 'admin/add_link_button' : 'admin/add_page_button')),
					),

					'saveview' => array(
						'tags' => 'name="dosaveview"',
						'label' => qa_lang_html('admin/save_view_button'),
					),

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

				'hidden' => array(
					'dosavepage' => '1', // for IE
					'edit' => @$editpage['pageid'],
					'external' => (int)$isexternal,
					'code' => qa_get_form_security_code('admin/pages'),
				),
			);

			if ($isexternal) {
				unset($qa_content['form']['fields']['slug']);
				unset($qa_content['form']['fields']['heading']);
				unset($qa_content['form']['fields']['content']);
			} else {
				unset($qa_content['form']['fields']['url']);
				unset($qa_content['form']['fields']['newwindow']);
			}

			if (isset($editpage['pageid'])) {
				qa_set_display_rules($qa_content, array(
					'position_display' => '!dodelete',
					'permit_display' => '!dodelete',
					($isexternal ? 'url_display' : 'slug_display') => '!dodelete',
					($isexternal ? 'newwindow_display' : 'heading_display') => '!dodelete',
					'content_display' => '!dodelete',
				));
			} else {
				unset($qa_content['form']['fields']['slug']);
				unset($qa_content['form']['fields']['delete']);
			}

			if ($isexternal || !isset($editpage['pageid']))
				unset($qa_content['form']['buttons']['saveview']);

			$qa_content['focusid'] = 'name';
		} else {
			// List of standard navigation links
			$qa_content['form'] = array(
				'tags' => 'method="post" action="' . qa_self_html() . '"',

				'style' => 'tall',

				'fields' => array(),

				'buttons' => array(
					'save' => array(
						'tags' => 'name="dosaveoptions"',
						'label' => qa_lang_html('main/save_button'),
					),

					'addpage' => array(
						'tags' => 'name="doaddpage"',
						'label' => qa_lang_html('admin/add_page_button'),
					),

					'addlink' => array(
						'tags' => 'name="doaddlink"',
						'label' => qa_lang_html('admin/add_link_button'),
					),
				),

				'hidden' => array(
					'code' => qa_get_form_security_code('admin/pages'),
				),
			);

			$qa_content['form']['fields']['navlinks'] = array(
				'label' => qa_lang_html('admin/nav_links_explanation'),
				'type' => 'static',
				'tight' => true,
			);

			foreach ($navoptions as $optionname => $langkey) {
				$qa_content['form']['fields'][$optionname] = array(
					'label' => '<a href="' . qa_path_html($navpaths[$optionname]) . '">' . qa_lang_html($langkey) . '</a>',
					'tags' => 'name="option_' . $optionname . '"',
					'type' => 'checkbox',
					'value' => qa_opt($optionname),
				);
			}

			$qa_content['form']['fields'][] = array(
				'type' => 'blank'
			);

			// List of suggested plugin pages

			$listhtml = '';

			$pagemodules = qa_load_modules_with('page', 'suggest_requests');

			foreach ($pagemodules as $tryname => $trypage) {
				$suggestrequests = $trypage->suggest_requests();

				foreach ($suggestrequests as $suggestrequest) {
					$listhtml .= '<li><b><a href="' . qa_path_html($suggestrequest['request']) . '">' . qa_html($suggestrequest['title']) . '</a></b>';

					$listhtml .= qa_lang_html_sub('admin/plugin_module', qa_html($tryname));

					$listhtml .= strtr(qa_lang_html('admin/add_link_link'), array(
						'^1' => '<a href="' . qa_path_html(qa_request(), array('doaddlink' => 1, 'text' => $suggestrequest['title'], 'url' => $suggestrequest['request'], 'nav' => @$suggestrequest['nav'])) . '">',
						'^2' => '</a>',
					));

					if (method_exists($trypage, 'admin_form'))
						$listhtml .= ' - <a href="' . qa_admin_module_options_path('page', $tryname) . '">' . qa_lang_html('admin/options') . '</a>';

					$listhtml .= '</li>';
				}
			}

			if (strlen($listhtml)) {
				$qa_content['form']['fields']['plugins'] = array(
					'label' => qa_lang_html('admin/plugin_pages_explanation'),
					'type' => 'custom',
					'html' => '<ul style="margin-bottom:0;">' . $listhtml . '</ul>',
				);
			}

			// List of custom pages or links

			$listhtml = '';

			foreach ($pages as $page) {
				$listhtml .= '<li><b><a href="' . qa_custom_page_url($page) . '">' . qa_html($page['title']) . '</a></b>';

				$listhtml .= strtr(qa_lang_html(($page['flags'] & QA_PAGE_FLAGS_EXTERNAL) ? 'admin/edit_link' : 'admin/edit_page'), array(
					'^1' => '<a href="' . qa_path_html('admin/pages', array('edit' => $page['pageid'])) . '">',
					'^2' => '</a>',
				));

				$listhtml .= '</li>';
			}

			$qa_content['form']['fields']['pages'] = array(
				'label' => strlen($listhtml) ? qa_lang_html('admin/click_name_edit') : qa_lang_html('admin/pages_explanation'),
				'type' => 'custom',
				'html' => strlen($listhtml) ? '<ul style="margin-bottom:0;">' . $listhtml . '</ul>' : null,
			);
		}

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


		return $qa_content;
	}
}
