<?php
/**
 * @package Admin
 */

if ( ! defined( 'WPSEO_VERSION' ) ) {
	header( 'Status: 403 Forbidden' );
	header( 'HTTP/1.1 403 Forbidden' );
	exit();
}

if ( ! class_exists( 'WPSEO_Social_Admin' ) ) {
	/**
	 * This class adds the Social tab to the WP SEO metabox and makes sure the settings are saved.
	 */
	class WPSEO_Social_Admin extends WPSEO_Metabox {

		/**
		 * Class constructor
		 */
		public function __construct() {
			add_action( 'wpseo_tab_translate', array( $this, 'translate_meta_boxes' ) );
			add_action( 'wpseo_tab_header', array( $this, 'tab_header' ), 60 );
			add_action( 'wpseo_tab_content', array( $this, 'tab_content' ) );
			add_filter( 'wpseo_save_metaboxes', array( $this, 'save_meta_boxes' ), 10, 1 );
			add_action( 'wpseo_save_compare_data', array( $this, 'og_data_compare' ), 10, 1 );
		}

		/**
		 * Translate text strings for use in the meta box
		 *
		 * IMPORTANT: if you want to add a new string (option) somewhere, make sure you add that array key to
		 * the main meta box definition array in the class WPSEO_Meta() as well!!!!
		 */
		public static function translate_meta_boxes() {
			$title_text       = __( 'If you don\'t want to use the post title for sharing the post on %s but instead want another title there, write it here.', 'wordpress-seo' );
			$description_text = __( 'If you don\'t want to use the meta description for sharing the post on %s but want another description there, write it here.', 'wordpress-seo' );
			$image_text       = __( 'If you want to override the image used on %s for this post, upload / choose an image or add the URL here.', 'wordpress-seo' );

			$options  = WPSEO_Options::get_all();

			foreach (
				array(
					'opengraph'   => __( 'Facebook', 'wordpress-seo' ),
					'twitter'     => __( 'Twitter', 'wordpress-seo' ),
					'googleplus'  => __( 'Google+', 'wordpress-seo' ),
				) as $network => $label
			) {
				if ( true === $options[ $network ] ) {
					if ( 'googleplus' == $network ) {
						$network = 'google-plus'; // Yuck, I know.
					}

					self::$meta_fields['social'][ $network . '-title' ]['title']       = sprintf( __( '%s Title', 'wordpress-seo' ), $label );
					self::$meta_fields['social'][ $network . '-title' ]['description'] = sprintf( $title_text, $label );

					self::$meta_fields['social'][ $network . '-description' ]['title']       = sprintf( __( '%s Description', 'wordpress-seo' ), $label );
					self::$meta_fields['social'][ $network . '-description' ]['description'] = sprintf( $description_text, $label );

					self::$meta_fields['social'][ $network . '-image' ]['title']       = sprintf( __( '%s Image', 'wordpress-seo' ), $label );
					self::$meta_fields['social'][ $network . '-image' ]['description'] = sprintf( $image_text, $label );
				}
			}

		}

		/**
		 * Output the tab header for the Social tab
		 */
		public function tab_header() {
			echo '<li class="social"><a class="wpseo_tablink" href="#wpseo_social">' . __( 'Social', 'wordpress-seo' ) . '</a></li>';
		}

		/**
		 * Output the tab content
		 */
		public function tab_content() {
			$content = '';
			foreach ( $this->get_meta_field_defs( 'social' ) as $meta_key => $meta_field ) {
				$content .= $this->do_meta_box( $meta_field, $meta_key );
			}
			$this->do_tab( 'social', __( 'Social', 'wordpress-seo' ), $content );
		}


		/**
		 * Filter over the meta boxes to save, this function adds the Social meta boxes.
		 *
		 * @param   array $field_defs Array of metaboxes to save.
		 *
		 * @return  array
		 */
		public function save_meta_boxes( $field_defs ) {
			return array_merge( $field_defs, $this->get_meta_field_defs( 'social' ) );
		}

		/**
		 * This method will compare opengraph fields with the posted values.
		 *
		 * When fields are changed, the facebook cache will be purge.
		 *
		 * @param object $post
		 */
		public function og_data_compare( $post ) {

			// Check if post data is available, if post_id is set and if original post_status is publish
			if ( ! empty( $_POST ) && ! empty( $post->ID ) && $post->post_status == 'publish' && $_POST['original_post_status'] === 'publish' ) {

				$fields_to_compare = array(
					'opengraph-title',
					'opengraph-description',
					'opengraph-image'
				);

				$reset_facebook_cache = false;

				foreach ( $fields_to_compare AS $field_to_compare ) {
					$old_value = self::get_value( $field_to_compare, $post->ID );
					$new_value = self::get_post_value( self::$form_prefix . $field_to_compare );

					if ( $old_value !== $new_value ) {
						$reset_facebook_cache = true;
						break;
					}
				}

				if ( $reset_facebook_cache ) {
					wp_remote_get(
						'https://graph.facebook.com/?id=' . get_permalink( $post->ID ) . '&scrape=true&method=post'
					);
				}
			}
		}


		/********************** DEPRECATED METHODS **********************/

		/**
		 * Define the meta boxes for the Social tab
		 *
		 * @deprecated 1.5.0
		 * @deprecated use WPSEO_Meta::get_meta_field_defs()
		 * @see        WPSEO_Meta::get_meta_field_defs()
		 *
		 * @param    string $post_type
		 *
		 * @return    array    Array containing the meta boxes
		 */
		public function get_meta_boxes( $post_type = 'post' ) {
			_deprecated_function( __METHOD__, 'WPSEO 1.5.0', 'WPSEO_Meta::get_meta_field_defs()' );

			return $this->get_meta_field_defs( 'social' );
		}

	} /* End of class */

} /* End of class-exists wrapper */
