<?php

/**
 * VideoPress Shortcode Handler
 *
 * This file may or may not be included from the Jetpack VideoPress module.
 */

class VideoPress_Shortcode {
	/** @var VideoPress_Shortcode */
	protected static $instance;

	protected function __construct() {

		// By explicitly declaring the provider here, we can speed things up by not relying on oEmbed discovery.
		wp_oembed_add_provider( '#^https?://videopress.com/v/.*#', 'http://public-api.wordpress.com/oembed/1.0/', true );

		add_shortcode( 'videopress', array( $this, 'shortcode_callback' ) );
		add_shortcode( 'wpvideo',    array( $this, 'shortcode_callback' ) );

		add_filter('wp_video_shortcode_override', array( $this, 'video_shortcode_override' ), 10, 4);

		add_filter( 'oembed_fetch_url', array( $this, 'add_oembed_for_parameter' ) );

		$this->add_video_embed_hander();
	}

	/**
	 * @return VideoPress_Shortcode
	 */
	public static function initialize() {
		if ( ! isset ( self::$instance ) ) {
			self::$instance = new self();
		}

		return self::$instance;
	}

	/**
	 * Translate a 'videopress' or 'wpvideo' shortcode and arguments into a video player display.
	 *
	 * Expected input formats:
	 *
	 * [videopress OcobLTqC]
	 * [wpvideo OcobLTqC]
	 *
	 * @link http://codex.wordpress.org/Shortcode_API Shortcode API
	 * @param array $attr shortcode attributes
	 * @return string HTML markup or blank string on fail
	 */
	public function shortcode_callback( $attr ) {
		global $content_width;

		/**
		 * We only accept GUIDs as a first unnamed argument.
		 */
		$guid = isset( $attr[0] ) ? $attr[0] : null;

		if ( isset( $attr['postid'] ) ) {
			$guid = get_post_meta( $attr['postid'], 'videopress_guid', true );
		}

		/**
		 * Make sure the GUID passed in matches how actual GUIDs are formatted.
		 */
		if ( ! videopress_is_valid_guid( $guid ) ) {
			return '';
		}

		/**
		 * Set the defaults
		 */
		$defaults = array(
			'w'               => 0,     // Width of the video player, in pixels
			'at'              => 0,     // How many seconds in to initially seek to
			'hd'              => true,  // Whether to display a high definition version
			'loop'            => false, // Whether to loop the video repeatedly
			'freedom'         => false, // Whether to use only free/libre codecs
			'autoplay'        => false, // Whether to autoplay the video on load
			'permalink'       => true,  // Whether to display the permalink to the video
			'flashonly'       => false, // Whether to support the Flash player exclusively
			'defaultlangcode' => false, // Default language code
		);

		$attr = shortcode_atts( $defaults, $attr, 'videopress' );

		/**
		 * Cast the attributes, post-input.
		 */
		$attr['width']   = absint( $attr['w'] );
		$attr['hd']      = (bool) $attr['hd'];
		$attr['freedom'] = (bool) $attr['freedom'];

		/**
		 * If the provided width is less than the minimum allowed
		 * width, or greater than `$content_width` ignore.
		 */
		if ( $attr['width'] < VIDEOPRESS_MIN_WIDTH ) {
			$attr['width'] = 0;
		} elseif ( isset( $content_width ) && $content_width > VIDEOPRESS_MIN_WIDTH && $attr['width'] > $content_width ) {
			$attr['width'] = 0;
		}

		/**
		 * If there was an invalid or unspecified width, set the width equal to the theme's `$content_width`.
		 */
		if ( 0 === $attr['width'] && isset( $content_width ) && $content_width >= VIDEOPRESS_MIN_WIDTH ) {
			$attr['width'] = $content_width;
		}

		/**
		 * If the width isn't an even number, reduce it by one (making it even).
		 */
		if ( 1 === ( $attr['width'] % 2 ) ) {
			$attr['width'] --;
		}

		/**
		 * Filter the default VideoPress shortcode options.
		 *
		 * @module videopress
		 *
		 * @since 2.5.0
		 *
		 * @param array $args Array of VideoPress shortcode options.
		 */
		$options = apply_filters( 'videopress_shortcode_options', array(
			'at'              => (int) $attr['at'],
			'hd'              => $attr['hd'],
			'loop'            => $attr['loop'],
			'freedom'         => $attr['freedom'],
			'autoplay'        => $attr['autoplay'],
			'permalink'       => $attr['permalink'],
			'force_flash'     => (bool) $attr['flashonly'],
			'defaultlangcode' => $attr['defaultlangcode'],
			'forcestatic'     => false, // This used to be a displayed option, but now is only
			// accessible via the `videopress_shortcode_options` filter.
		) );

		// Register VideoPress scripts
		wp_register_script( 'videopress', 'https://v0.wordpress.com/js/videopress.js', array( 'jquery', 'swfobject' ), '1.09' );

		require_once( dirname( __FILE__ ) . '/class.videopress-video.php' );
		require_once( dirname( __FILE__ ) . '/class.videopress-player.php' );

		$player = new VideoPress_Player( $guid, $attr['width'], $options );

		if ( is_feed() ) {
			return $player->asXML();
		} else {
			return $player->asHTML();
		}
	}

	/**
	 * Override the standard video short tag to also process videopress files as well.
	 *
	 * This will, parse the src given, and if it is a videopress file, it will parse as the
	 * VideoPress shortcode instead.
	 *
	 * @param string $html     Empty variable to be replaced with shortcode markup.
	 * @param array  $attr     Attributes of the video shortcode.
	 * @param string $content  Video shortcode content.
	 * @param int    $instance Unique numeric ID of this video shortcode instance.
	 *
	 * @return string
	 */
	public function video_shortcode_override($html, $attr, $content, $instance) {

		$videopress_guid = null;

		if ( isset( $attr['videopress_guid'] ) ) {
			$videopress_guid = $attr['videopress_guid'];

		} else {
			// Handle the different possible url attributes
			$url_keys = array( 'src', 'mp4' );

			foreach ( $url_keys as $key ) {
				if ( isset ( $attr[ $key ] ) ) {
					$url = $attr[ $key ];

					if ( preg_match( '@videos.(videopress\.com|files\.wordpress\.com)/([a-z0-9]{8})/@i', $url, $matches ) ) {
						$videopress_guid = $matches[2];
					}

					// Also test for videopress oembed url, which is used by the Video Media Widget.
					if ( ! $videopress_guid && preg_match( '@https://videopress.com/v/([a-z0-9]{8})@i', $url, $matches ) ) {
						$videopress_guid = $matches[1];
					}

					break;
				}
			}
		}

		if ( $videopress_guid ) {
			$videopress_attr = array( $videopress_guid );
			if ( isset( $attr['width'] ) ) {
				$videopress_attr['w'] = (int) $attr['width'];
			}
			if ( isset( $attr['autoplay'] ) ) {
				$videopress_attr['autoplay'] = $attr['autoplay'];
			}
			if ( isset( $attr['loop'] ) ) {
				$videopress_attr['loop'] = $attr['loop'];
			}

			// Then display the VideoPress version of the stored GUID!
			return $this->shortcode_callback( $videopress_attr );
		}

		return '';
	}

	/**
	 * Adds a `for` query parameter to the oembed provider request URL.
	 *
	 * @param String $oembed_provider
	 * @return String $ehnanced_oembed_provider
	 */
	public function add_oembed_for_parameter( $oembed_provider ) {
		if ( false === stripos( $oembed_provider, 'videopress.com' ) ) {
			return $oembed_provider;
		}
		return add_query_arg( 'for', parse_url( home_url(), PHP_URL_HOST ), $oembed_provider );
	}

	/**
	 * Register a VideoPress handler for direct links to .mov files (and potential other non-handled types later).
	 */
	public function add_video_embed_hander() {
		// These are the video extensions that VideoPress can transcode and considers video as well (even if core does not).
		$extensions          = array( 'mov' );
		$override_extensions = implode( '|', $extensions );

		$regex = "#^https?://videos.(videopress.com|files.wordpress.com)/.+?.($override_extensions)$#i";

		/** This filter is already documented in core/wp-includes/embed.php */
		$filter = apply_filters( 'wp_video_embed_handler', 'wp_embed_handler_video' );
		wp_embed_register_handler( 'video', $regex, $filter, 10 );
	}
}

VideoPress_Shortcode::initialize();