<?php
namespace W3TC;
/**
 * W3 Forum Widget
 */
class Generic_Plugin_WidgetNews {
	/**
	 * Config
	 */
	private $_config = null;

	function __construct() {
		$this->_config = Dispatcher::config();
	}

	/**
	 * Runs plugin
	 */
	function run() {
		if ( Util_Admin::get_current_wp_page() == 'w3tc_dashboard' )
			add_action( 'admin_enqueue_scripts', array( $this, 'enqueue' ) );

		add_action( 'w3tc_widget_setup', array(
				$this,
				'wp_dashboard_setup'
			) );
		add_action( 'w3tc_network_dashboard_setup', array(
				$this,
				'wp_dashboard_setup'
			) );

		if ( is_admin() ) {
			add_action( 'wp_ajax_w3tc_widget_latest_news_ajax', array( $this, 'action_widget_latest_news_ajax' ) );
		}
	}

	/**
	 * Dashboard setup action
	 *
	 * @return void
	 */
	function wp_dashboard_setup() {
		Util_Widget::add( 'w3tc_latest_news', __( 'News', 'w3-total-cache' ), array(
				$this,
				'widget_latest'
			), array(
				$this,
				'widget_latest_control'
			), 'side' );
	}

	/**
	 * Returns key for transient cache of "widget latest"
	 *
	 * @return string
	 */
	function _widget_latest_cache_key() {
		return 'dash_' . md5( 'w3tc_latest_news' );
	}

	/**
	 * Prints latest widget contents
	 *
	 * @return void
	 */
	function widget_latest() {
		if ( false !== ( $output = get_transient( $this->_widget_latest_cache_key() ) ) )
			echo $output;
		else
			include W3TC_INC_DIR . '/widget/latest_news.php';
	}

	/**
	 * Prints latest widget contents
	 *
	 * @return void
	 */
	function action_widget_latest_news_ajax() {
		// load content of feed
		global $wp_version;

		$items = array();
		$items_count = $this->_config->get_integer( 'widget.latest_news.items' );

		include_once ABSPATH . WPINC . '/feed.php';
		$feed = fetch_feed( W3TC_NEWS_FEED_URL );

		if ( !is_wp_error( $feed ) ) {
			$feed_items = $feed->get_items( 0, $items_count );

			foreach ( $feed_items as $feed_item ) {
				$items[] = array(
					'link' => $feed_item->get_link(),
					'title' => htmlspecialchars_decode( $feed_item->get_title() )
				);
			}
		}

		ob_start();
		include W3TC_INC_DIR . '/widget/latest_news_ajax.php';

		// Default lifetime in cache of 12 hours (same as the feeds)
		set_transient( $this->_widget_latest_cache_key(), ob_get_flush(), 43200 );
		die();
	}

	/**
	 * Latest widget control
	 *
	 * @param integer $widget_id
	 * @param array   $form_inputs
	 * @return void
	 */
	function widget_latest_control( $widget_id, $form_inputs = array() ) {
		if ( $_SERVER['REQUEST_METHOD'] == 'POST' ) {


			$this->_config->set( 'widget.latest_news.items', Util_Request::get_integer( 'w3tc_widget_latest_news_items', 3 ) );
			$this->_config->save();
			delete_transient( $this->_widget_latest_cache_key() );
		}
		include W3TC_INC_DIR . '/widget/latest_news_control.php';
	}

	public function enqueue() {
		wp_enqueue_style( 'w3tc-widget' );
		wp_enqueue_script( 'w3tc-metadata' );
		wp_enqueue_script( 'w3tc-widget' );
	}
}
