<?php
/**
 * VideoPress Attachment_Handler
 *
 * @package automattic/jetpack-videopress
 */

namespace Automattic\Jetpack\VideoPress;

use Automattic\Jetpack\Connection\Client;
use Automattic\Jetpack\Current_Plan;
use WP_Error;
use WP_Post;

/**
 * VideoPress Attachment_Handler class.
 */
class Attachment_Handler {

	/**
	 * Initializer
	 *
	 * This method should be called only once by the Initializer class. Do not call this method again.
	 */
	public static function init() {

		if ( ! Status::is_active() ) {
			return;
		}

		add_filter( 'wp_get_attachment_url', array( __CLASS__, 'maybe_get_attached_url_for_videopress' ), 10, 2 );
		add_filter( 'get_attached_file', array( __CLASS__, 'maybe_get_attached_url_for_videopress' ), 10, 2 );

		if ( Current_Plan::supports( 'videopress' ) ) {
			add_filter( 'upload_mimes', array( __CLASS__, 'add_video_upload_mimes' ), 999 );
		}

		add_filter( 'pre_delete_attachment', array( __CLASS__, 'delete_video_wpcom' ), 10, 2 );
		add_filter( 'wp_mime_type_icon', array( __CLASS__, 'wp_mime_type_icon' ), 10, 3 );
		add_filter( 'wp_video_extensions', array( __CLASS__, 'add_videopress_extenstion' ) );

		add_filter( 'wp_prepare_attachment_for_js', array( __CLASS__, 'prepare_attachment_for_js' ) );
		add_filter( 'ajax_query_attachments_args', array( __CLASS__, 'ajax_query_attachments_args' ) );
		add_action( 'pre_get_posts', array( __CLASS__, 'media_list_table_query' ) );

		add_filter( 'user_has_cap', array( __CLASS__, 'disable_delete_if_disconnected' ), 10, 3 );

		add_action( 'admin_print_scripts-upload.php', array( __CLASS__, 'enqueue_media_library_poll' ) );
		add_action( 'admin_print_styles-upload.php', array( __CLASS__, 'enqueue_media_library_styles' ) );
		add_filter( 'heartbeat_received', array( __CLASS__, 'heartbeat_received' ), 10, 2 );
	}

	/**
	 * Returns the VideoPress URL for the give post id, otherwise returns the provided default.
	 *
	 * This is an attachment-based filter handler.
	 *
	 * @param string $default The default return value if post id is not a VideoPress video.
	 * @param int    $post_id The post id for the current attachment.
	 */
	public static function maybe_get_attached_url_for_videopress( $default, $post_id ) {
		$videopress_url = videopress_get_attachment_url( $post_id );

		if ( null !== $videopress_url ) {
			return $videopress_url;
		}

		return $default;
	}

	/**
	 * Makes sure that all video mimes are added in, as multi site installs can remove them.
	 *
	 * @param array $existing_mimes Mime types to extend/filter.
	 * @return array
	 */
	public static function add_video_upload_mimes( $existing_mimes = array() ) {
		$mime_types  = wp_get_mime_types();
		$video_types = array_filter( $mime_types, array( __CLASS__, 'filter_video_mimes' ) );

		foreach ( $video_types as $key => $value ) {
			$existing_mimes[ $key ] = $value;
		}

		// Make sure that videopress mimes are considered videos.
		$existing_mimes['videopress'] = 'video/videopress';

		return $existing_mimes;
	}

	/**
	 * Filter designed to get rid of non video mime types.
	 *
	 * @param string $value Mime type to filter.
	 * @return int
	 */
	public static function filter_video_mimes( $value ) {
		return preg_match( '@^video/@', $value );
	}

	/**
	 * Attempts to delete a VideoPress video from wp.com.
	 * Will block the deletion from continuing if certain errors return from the wp.com API.
	 *
	 * @param Boolean $delete if the deletion should occur or not (unused).
	 * @param WP_Post $post the post object.
	 *
	 * @return null|WP_Error|Boolean null if deletion should continue.
	 */
	public static function delete_video_wpcom( $delete, $post ) {
		if ( ! is_videopress_attachment( $post->ID ) ) {
			return null;
		}

		$guid = get_post_meta( $post->ID, 'videopress_guid', true );
		if ( empty( $guid ) ) {
			self::delete_video_poster_attachment( $post->ID );
			return null;
		}

		// Phone home and have wp.com delete the VideoPress entry and files.
		$wpcom_response = Client::wpcom_json_api_request_as_blog(
			sprintf( '/videos/%s/delete', $guid ),
			'1.1',
			array( 'method' => 'POST' ),
			array( 'user_id' => get_current_user_id() )
		);

		if ( is_wp_error( $wpcom_response ) ) {
			return $wpcom_response;
		}

		// Upon success or a 404 (video already deleted on wp.com), return null to allow the deletion to continue.
		if ( 200 === $wpcom_response['response']['code'] || 404 === $wpcom_response['response']['code'] ) {
			self::delete_video_poster_attachment( $post->ID );
			return null;
		}

		// Otherwise we stop the deletion from proceeding.
		return false;
	}

	/**
	 * Deletes a video poster attachment if it exists.
	 *
	 * @param int $attachment_id the WP attachment id.
	 */
	private static function delete_video_poster_attachment( $attachment_id ) {
		$thumbnail_id = get_post_meta( $attachment_id, '_thumbnail_id', true );
		if ( ! empty( $thumbnail_id ) ) {
			// Let's ensure this is a VP poster image before we delete it.
			if ( '1' === get_post_meta( $thumbnail_id, 'videopress_poster_image', true ) ) {
				// This call triggers the `delete_video_wpcom` filter again but it bails early at the is_videopress_attachment() check.
				wp_delete_attachment( $thumbnail_id );
			}
		}
	}

	/**
	 * Filter the mime type icon.
	 *
	 * @param string $icon Icon path.
	 * @param string $mime Mime type.
	 * @param int    $post_id Post ID.
	 *
	 * @return string
	 */
	public static function wp_mime_type_icon( $icon, $mime, $post_id ) {

		if ( $mime !== 'video/videopress' ) {
			return $icon;
		}

		$status = get_post_meta( $post_id, 'videopress_status', true );

		if ( $status === 'complete' ) {
			return $icon;
		}

		return 'https://wordpress.com/wp-content/mu-plugins/videopress/images/media-video-processing-icon.png';
	}

	/**
	 * Filter the list of supported video formats.
	 *
	 * @param array $extensions Supported video formats.
	 *
	 * @return array
	 */
	public static function add_videopress_extenstion( $extensions ) {
		$extensions[] = 'videopress';
		return $extensions;
	}

	/**
	 * Make sure that any Video that has a VideoPress GUID passes that data back.
	 *
	 * @param array $post Attachment data array.
	 * @return array
	 */
	public static function prepare_attachment_for_js( $post ) {
		if ( 'video' === $post['type'] ) {
			$guid = get_post_meta( $post['id'], 'videopress_guid', true );
			if ( $guid ) {
				$post['videopress_guid'] = $guid;
			}
			$status = get_post_meta( $post['id'], 'videopress_status', true );
			if ( $status ) {
				$post['videopress_status'] = $status;
			}
		}
		return $post;
	}

	/**
	 * Media Grid:
	 * Filter out any videopress video posters that we've downloaded,
	 * so that they don't seem to display twice.
	 *
	 * @param array $args Query variables.
	 */
	public static function ajax_query_attachments_args( $args ) {
		$meta_query = array(
			array(
				'key'     => 'videopress_poster_image',
				'compare' => 'NOT EXISTS',
			),
		);

		// If there was already a meta query, let's AND it via
		// nesting it with our new one. No need to specify the
		// relation, as it defaults to AND.
		if ( ! empty( $args['meta_query'] ) ) {
			$meta_query[] = $args['meta_query'];
		}
		$args['meta_query'] = $meta_query;

		return $args;
	}

	/**
	 * Media List:
	 * Do the same as `videopress_ajax_query_attachments_args()` but for the list view.
	 *
	 * @param array $query WP_Query instance.
	 */
	public static function media_list_table_query( $query ) {

		if (
			! function_exists( 'get_current_screen' )
			|| get_current_screen() === null
		) {
			return;
		}

		if ( is_admin() && $query->is_main_query() && ( 'upload' === get_current_screen()->id ) ) {
			$meta_query = array(
				array(
					'key'     => 'videopress_poster_image',
					'compare' => 'NOT EXISTS',
				),
			);

			$old_meta_query = $query->get( 'meta_query' );
			if ( $old_meta_query ) {
				$meta_query[] = $old_meta_query;
			}

			$query->set( 'meta_query', $meta_query );
		}
	}

	/**
	 * Filter to disable the `delete_post` capability
	 * for VideoPress attachments if the current user is
	 * not connected.
	 *
	 * @param array $allcaps All the capabilities of the user.
	 * @param array $cap     [0] Required capability.
	 * @param array $args    [0] Requested capability.
	 *                       [1] User ID.
	 *                       [2] Associated object ID.
	 * @return array the filtered array of capabilities.
	 */
	public static function disable_delete_if_disconnected( $allcaps, $cap, $args ) {

		// Only apply this filter to `delete_post` checks
		if ( ! isset( $args[0] ) || 'delete_post' !== $args[0] ) {
			return $allcaps;
		}

		// Only apply this filter to VideoPress attachments
		if ( ! isset( $args[2] ) || ! is_videopress_attachment( $args[2] ) ) {
			return $allcaps;
		}

		// Set the capability to false if the user can't perform the actions
		if ( ! Data::can_perform_action() ) {
			$allcaps[ $cap[0] ] = false;
		}

		return $allcaps;
	}

	/**
	 * Enqueues the script that hooks into WP Heartbeat to refresh
	 * processing VideoPress video data in the media library grid.
	 *
	 * @since 0.35.4
	 *
	 * @return void
	 */
	public static function enqueue_media_library_poll() {
		wp_enqueue_script(
			'videopress-media-library-poll',
			plugins_url( 'js/media-library-poll.js', __FILE__ ),
			array( 'jquery', 'heartbeat', 'media-grid' ),
			Package_Version::PACKAGE_VERSION,
			true
		);

		add_filter( 'heartbeat_settings', array( __CLASS__, 'heartbeat_settings' ) );
	}

	/**
	 * Adds inline styles for the media library grid on the upload page.
	 *
	 * @since 0.35.4
	 *
	 * @return void
	 */
	public static function enqueue_media_library_styles() {
		// Constrain poster images so they fit within the media library grid cell.
		wp_add_inline_style(
			'media-views',
			'.attachment-preview.type-video .thumbnail .centered img.thumbnail { max-width: 100%; max-height: 100%; }'
		);
	}

	/**
	 * Lowers the Heartbeat minimum interval on the media library page
	 * so the polling script can request a faster tick rate.
	 *
	 * @since 0.35.4
	 *
	 * @param array $settings Heartbeat settings.
	 * @return array
	 */
	public static function heartbeat_settings( $settings ) {
		$settings['minimalInterval'] = 5;

		return $settings;
	}

	/**
	 * Heartbeat API handler that checks the processing status of VideoPress videos.
	 *
	 * @since 0.35.4
	 *
	 * @param array $response The Heartbeat response.
	 * @param array $data     The data sent with the Heartbeat request.
	 * @return array
	 */
	public static function heartbeat_received( $response, $data ) {
		if ( empty( $data['videopress_processing_ids'] ) || ! is_array( $data['videopress_processing_ids'] ) ) {
			return $response;
		}

		$statuses = array();
		foreach ( $data['videopress_processing_ids'] as $id ) {
			$id = (int) $id;

			if ( ! current_user_can( 'edit_post', $id ) ) {
				continue;
			}

			$status = get_post_meta( $id, 'videopress_status', true );
			if ( $status ) {
				$statuses[ $id ] = $status;
			}
		}

		if ( ! empty( $statuses ) ) {
			$response['videopress_processing_status'] = $statuses;
		}

		return $response;
	}
}