<?php

/*
 * admin side controller
 * accessible in $polylang global object
 *
 * properties:
 * options          => inherited, reference to Polylang options array
 * model            => inherited, reference to PLL_Model object
 * links_model      => inherited, reference to PLL_Links_Model object
 * settings_page    => optional, reference to PLL_Settings object
 * links            => reference to PLL_Links object
 * curlang          => optional, current language used to filter admin content
 * pref_lang        => preferred language used as default when saving posts or terms
 * filters          => reference to PLL_Filters object
 * filters_columns  => reference to PLL_Admin_Filters_Columns object
 * filters_post     => reference to PLL_Admin_Filters_Post object
 * filters_term     => reference to PLL_Admin_filters_Term object
 * nav_menu         => reference to PLL_Admin_Nav_Menu object
 * sync             => reference to PLL_Admin_Sync object
 * filters_media    => optional, reference to PLL_Admin_Filters_Media object
 *
 * @since 1.2
 */
class PLL_Admin extends PLL_Base {
	public $curlang, $pref_lang;
	public $settings_page, $filters, $filters_columns, $filters_post, $filters_term, $nav_menu, $sync, $filters_media;

	/*
	 * loads the polylang text domain
	 * setups filters and action needed on all admin pages and on plugins page
	 *
	 * @since 1.2
	 *
	 * @param object $links_model
	 */
	public function __construct(&$links_model) {
		parent::__construct($links_model);

		// plugin i18n, only needed for backend
		load_plugin_textdomain('polylang', false, basename(POLYLANG_DIR).'/languages');

		// adds the link to the languages panel in the wordpress admin menu
		add_action('admin_menu', array(&$this, 'add_menus'));

		// setup js scripts and css styles
		add_action('admin_enqueue_scripts', array(&$this, 'admin_enqueue_scripts'));
		add_action('admin_print_footer_scripts', array(&$this, 'admin_print_footer_scripts'));

		// adds a 'settings' link in the plugins table
		add_filter('plugin_action_links_' . POLYLANG_BASENAME, array(&$this, 'plugin_action_links'));
		add_action('in_plugin_update_message-' . POLYLANG_BASENAME, array(&$this, 'plugin_update_message'), 10, 2);
	}

	/*
	 * setups filters and action needed on all admin pages and on plugins page
	 * loads the settings pages or the filters base on the request
	 *
	 * @since 1.2
	 *
	 * @param object $links_model
	 */
	public function init() {
		if (PLL_SETTINGS)
			$this->settings_page = new PLL_Settings($this);

		if (!$this->model->get_languages_list())
			return;

		$this->links = new PLL_Links($this);

		// filter admin language for users
		// we must not call user info before WordPress defines user roles in wp-settings.php
		add_filter('setup_theme', array(&$this, 'init_user'));
		add_filter('request', array(&$this, 'request'));


		// adds the languages in admin bar
		add_action('admin_bar_menu', array(&$this, 'admin_bar_menu'), 100); // 100 determines the position

		// setup filters for admin pages
		if (!PLL_SETTINGS)
			add_action('wp_loaded', array(&$this, 'add_filters'));
	}

	/*
	 * adds the link to the languages panel in the wordpress admin menu
	 *
	 * @since 0.1
	 */
	public function add_menus() {
		add_submenu_page('options-general.php', $title = __('Languages', 'polylang'), $title, 'manage_options', 'mlang',
			PLL_SETTINGS ? array($this->settings_page, 'languages_page') : create_function('', ''));
	}

	/*
	 * setup js scripts & css styles (only on the relevant pages)
	 *
	 * @since 0.6
	 */
	public function admin_enqueue_scripts() {
		$screen = get_current_screen();
		if (empty($screen))
			return;
			
		$suffix = defined('SCRIPT_DEBUG') && SCRIPT_DEBUG ? '' : '.min';

		// for each script:
		// 0 => the pages on which to load the script
		// 1 => the scripts it needs to work
		// 2 => 1 if loaded even if languages have not been defined yet, 0 otherwise
		// 3 => 1 if loaded in footer
		// FIXME: check if I can load more scripts in footer
		$scripts = array(
			'admin' => array( array('settings_page_mlang'), array('jquery', 'wp-ajax-response', 'postbox'), 1 , 0),
			'post'  => array( array('post', 'media', 'async-upload', 'edit'),  array('jquery', 'wp-ajax-response', 'post', 'jquery-ui-autocomplete'), 0 , 1),
			'media' => array( array('upload'), array('jquery'), 0 , 1),
			'term'  => array( array('edit-tags'), array('jquery', 'wp-ajax-response', 'jquery-ui-autocomplete'), 0, 1),
			'user'  => array( array('profile', 'user-edit'), array('jquery'), 0 , 0),
		);

		foreach ($scripts as $script => $v)
			if (in_array($screen->base, $v[0]) && ($v[2] || $this->model->get_languages_list()))
				wp_enqueue_script('pll_'.$script, POLYLANG_URL .'/js/'.$script.$suffix.'.js', $v[1], POLYLANG_VERSION, $v[3]);

		wp_enqueue_style('polylang_admin', POLYLANG_URL .'/css/admin'.$suffix.'.css', array(), POLYLANG_VERSION);
	}

	/*
	 * sets pll_ajax_backend on all backend ajax request
	 *
	 * @since 1.4
	 */
	public function admin_print_footer_scripts() {
		global $post_ID;
		$params = array('pll_ajax_backend' => 1);
		if (!empty($post_ID))
			$params = array_merge($params, array('pll_post_id' => $post_ID));

		$str = $arr = '';
		foreach ($params as $k => $v) {
			$str .= $k . '=' . $v . '&';
			$arr .= (empty($arr) ? '' : ', ') . $k . ': ' . $v;
		}
?>
<script type="text/javascript">
	if (typeof jQuery != 'undefined') {
		(function($){
			$.ajaxPrefilter(function (options, originalOptions, jqXHR) {
				if (typeof options.data == 'string') {
					options.data = '<?php echo $str;?>'+options.data;
				}
				else {
					options.data = $.extend(options.data, {<?php echo $arr;?>});
				}
			});
		})(jQuery)
	}
</script><?php

	}

	/*
	 * adds a 'settings' link in the plugins table
	 *
	 * @since 0.1
	 *
	 * @param array $links list of links associated to the plugin
	 * @return array modified list of links
	 */
	public function plugin_action_links($links) {
		array_unshift($links, '<a href="admin.php?page=mlang">' . __('Settings', 'polylang') . '</a>');
		return $links;
	}

	/*
	 * adds the upgrade notice in plugins table
	 *
	 * @since 1.1.6
	 *
	 * @param array $plugin_data not used
	 * @param object $r plugin update data
	 */
	function plugin_update_message($plugin_data, $r) {
		if (isset($r->upgrade_notice))
			printf('<p style="margin: 3px 0 0 0; border-top: 1px solid #ddd; padding-top: 3px">%s</p>', $r->upgrade_notice);
	}

	/*
	 * defines the backend language and the admin language filter based on user preferences
	 *
	 * @since 1.2.3
	 */
	public function init_user() {
		// backend locale
		add_filter('locale', array(&$this, 'get_locale'));

		// language for admin language filter: may be empty
		// $_GET['lang'] is numeric when editing a language, not when selecting a new language in the filter
		if (!defined('DOING_AJAX') && !empty($_GET['lang']) && !is_numeric($_GET['lang']) && current_user_can('edit_user', $user_id = get_current_user_id()))
			update_user_meta($user_id, 'pll_filter_content', ($lang = $this->model->get_language($_GET['lang'])) ? $lang->slug : '');

		$this->curlang = $this->model->get_language(get_user_meta(get_current_user_id(), 'pll_filter_content', true));

		// set preferred language for use when saving posts and terms: must not be empty
		$this->pref_lang = empty($this->curlang) ? $this->model->get_language($this->options['default_lang']) : $this->curlang;
		$this->pref_lang = apply_filters('pll_admin_preferred_language', $this->pref_lang);

		// inform that the admin language has been set
		// only if the admin language is one of the Polylang defined language
		if ($curlang = $this->model->get_language(get_locale())) {
			$GLOBALS['text_direction'] = $curlang->is_rtl ? 'rtl' : 'ltr'; // force text direction according to language setting
			do_action('pll_language_defined', $curlang->slug, $curlang);
		}
		else
			do_action('pll_no_language_defined'); // to load overriden textdomains
	}
	
	/*
	 * avoids parsing a tax query when all languages are requested
	 * fixes https://wordpress.org/support/topic/notice-undefined-offset-0-in-wp-includesqueryphp-on-line-3877 introduced in WP 4.1
	 * @see the suggestion of @boonebgorges, https://core.trac.wordpress.org/ticket/31246
	 * 
	 * @since 1.6.5
	 * 
	 * @param array $qvars
	 * @return array
	 */
	public function request($qvars) {
			if (isset($qvars['lang']) && 'all' === $qvars['lang'])
				unset($qvars['lang']);
				
			return $qvars;
	}

	/*
	 * get the locale based on user preference
	 *
	 * @since 0.4
	 *
	 * @param string $locale
	 * @return string modified locale
	 */
	public function get_locale($locale) {
		return ($loc = get_user_meta(get_current_user_id(), 'user_lang', 'true')) ? $loc : $locale;
	}

	/*
	 * setup filters for admin pages
	 *
	 * @since 1.2
	 */
	public function add_filters() {
		// all these are separated just for convenience and maintainability
		$classes = array('Filters', 'Filters_Columns', 'Filters_Post', 'Filters_Term', 'Nav_Menu', 'Sync');

		// don't load media filters if option is disabled or if user has no right
		if ($this->options['media_support'] && ($obj = get_post_type_object('attachment')) && (current_user_can($obj->cap->edit_posts) || current_user_can($obj->cap->create_posts)))
			$classes[] = 'Filters_Media';

		foreach ($classes as $class) {
			$obj = strtolower($class);
			$class = apply_filters('pll_' . $obj, 'PLL_Admin_' . $class);
			$this->$obj = new $class($this);
		}
	}

	/*
	 * adds the languages list in admin bar for the admin languages filter
	 *
	 * @since 0.9
	 *
	 * @param object $wp_admin_bar
	 */
	public function admin_bar_menu($wp_admin_bar) {
		$url = ( is_ssl() ? 'https://' : 'http://' ) . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'];

		$all_item = (object) array(
			'slug' => 'all',
			'name' => __('Show all languages', 'polylang'),
			'flag' => '<span class="ab-icon"></span>'
		);

		$selected = empty($this->curlang) ? $all_item : $this->curlang;

		$wp_admin_bar->add_menu(array(
			'id'     => 'languages',
			'title'  => $selected->flag . '<span class="ab-label">'. esc_html($selected->name) . '</span>',
			'meta'  => array('title' => __('Filters content by language', 'polylang')),
		));

		foreach (array_merge(array($all_item), $this->model->get_languages_list()) as $lang) {
			if ($selected->slug == $lang->slug)
				continue;

			$wp_admin_bar->add_menu(array(
				'parent' => 'languages',
				'id'     => $lang->slug,
				'title'  => $lang->flag . esc_html($lang->name),
				'href'   => esc_url(add_query_arg('lang', $lang->slug, remove_query_arg('paged',$url))),
			));
		}
	}
	/*
	 * downloads mofiles from http://svn.automattic.com/wordpress-i18n/
	 * FIXME backward compatibility WP < 4.0
	 *
	 * @since 0.6
	 *
	 * @param string $locale locale to download
	 * @param bool $upgrade optional true if this is an upgrade, false if this is the first download, defaults to false
	 * @return bool true on success, false otherwise
	 */
	static public function download_mo($locale, $upgrade = false) {
		global $wp_version;
		$mofile = WP_LANG_DIR."/$locale.mo";

		// does file exists ?
		if ((file_exists($mofile) && !$upgrade) || $locale == 'en_US')
			return true;

		// does language directory exists ?
		if (!is_dir(WP_LANG_DIR)) {
			if (!@mkdir(WP_LANG_DIR))
				return false;
		}

		// will first look in tags/ (most languages) then in branches/ (only Greek ?)
		$base = 'http://svn.automattic.com/wordpress-i18n/'.$locale;
		$bases = array($base.'/tags/', $base.'/branches/');

		foreach ($bases as $base) {
			// get all the versions available in the subdirectory
			$resp = wp_remote_get($base);
			if (is_wp_error($resp) || 200 != $resp['response']['code'])
				continue;

			preg_match_all('#>([0-9\.]+)\/#', $resp['body'], $matches);
			if (empty($matches[1]))
				continue;

			rsort($matches[1]); // sort from newest to oldest
			$versions = $matches[1];

			$newest = $upgrade ? $upgrade : $wp_version;
			foreach ($versions as $key=>$version) {
				// will not try to download a too recent mofile
				if (version_compare($version, $newest, '>'))
					unset($versions[$key]);
				// will not download an older version if we are upgrading
				if ($upgrade && version_compare($version, $wp_version, '<='))
					unset($versions[$key]);
			}

			$versions = array_splice($versions, 0, 5); // reduce the number of versions to test to 5
			$args = array('timeout' => 30, 'stream' => true);

			// try to download the file
			foreach ($versions as $version) {
				$resp = wp_remote_get($base."$version/messages/$locale.mo", $args + array('filename' => $mofile));
				if (is_wp_error($resp) || 200 != $resp['response']['code']) {
					unlink($mofile); // otherwise we download a gzipped 404 page
					continue;
				}
				// try to download ms and continents-cities files if exist (will not return false if failed)
				// with new files introduced in WP 3.4
				foreach (array('ms', 'continents-cities', 'admin', 'admin-network') as $file) {
					$resp = wp_remote_get($base."$version/messages/$file-$locale.mo", $args + array('filename' => WP_LANG_DIR."/$file-$locale.mo"));
					if (is_wp_error($resp) || 200 != $resp['response']['code'])
						unlink(WP_LANG_DIR."/$file-$locale.mo");
				}
				// try to download theme files if exist (will not return false if failed)
				// FIXME not updated when the theme is updated outside a core update
				foreach (array('twentyten', 'twentyeleven', 'twentytwelve', 'twentythirteen', 'twentyfourteen') as $theme) {
					if (!is_dir($theme_dir = get_theme_root()."/$theme/languages"))
						continue; // the theme is not present

					$resp = wp_remote_get($base."$version/messages/$theme/$locale.mo", $args + array('filename' => "$theme_dir/$locale.mo"));
					if (is_wp_error($resp) || 200 != $resp['response']['code'])
						unlink("$theme_dir/$locale.mo");
				}
				return true;
			}
		}

		// we did not succeeded to download a file :(
		add_settings_error('general', 'pll_download_mo', __('The language was created, but the WordPress language file was not downloaded. Please install it manually.', 'polylang'));
		return false;
	}
}
