<?php
/**
 * Class td_video_support - tagDiv video support V 2.0 @since 4 nov 2015
 * downloads the video thumbnail and puts it asa a featured image to the post
 *
 * @note since 02.11.2020 facebook videos video thumbnail support has been discontinued - td video support will not download the video thumbnail and set it as featured image for the post anymore..
 *
 */
class td_video_support {

	private static $on_save_post_post_id; // here we keep the post_id when the save_post hook runs. We need the post_id to pass it to the other hook @see on_add_attachment_set_featured_image
    private static $caching_time = 10800; //seconds -> 3 hours

	private static $client_access_token = '281071126312386|83f03eb7e4a2707cd68aada9b3f98c79';

    // flag to make sure we run the 'on_save_post_get_video_thumb' save_post hook only once..
    // ..this is mainly because on gutenberg editor this hook runs twice and triggers a duplicate on video thumb generation
	private static $on_save_post_did_action = false;

	/**
	 * Render a video on the front end from URL
	 * @param $videoUrl - the video url that we want to render
	 *
	 * @return string - the player HTML
	 */
	static function render_video($videoUrl, $controls = 'yes', $autoplay = '', $loop = '', $is_ajax = false) {
	    $controlsParam = '';
	    $autoplayParam = '';
        $loopParam = '';

		$buffy = '';
		switch (self::detect_video_service($videoUrl)) {
			case 'youtube':
                if( $controls == '' ) {
                    $controlsParam = 'controls=0"';
                }
                if( $autoplay != '' && !( tdc_state::is_live_editor_ajax() || tdc_state::is_live_editor_iframe() ) ) {
                    $autoplayParam = 'autoplay=1&mute=1';
                }
                if( $loop != '' ) {
                    $loopParam = 'loop=1&playlist=' . self::get_youtube_id($videoUrl);
                }

				$video_id = self::get_youtube_id( $videoUrl );
				$video_info = td_remote_video::api_get_videos_info(array($video_id), 'youtube');
				$video_time_param = self::get_youtube_time_param($videoUrl);
				$video_thumb_url = self::get_thumb_url( $videoUrl );

                $tds_video_lazy = td_util::get_option('tds_video_lazy');
                if ( ! empty($tds_video_lazy) && wp_is_mobile() && ! $is_ajax && ! td_util::is_amp()) {

                    isset( $video_info[$video_id]['title']) ? $value_alt = $video_info[$video_id]['title'] : $value_alt="";

                    $buffy .= '
                        <div class="wpb_video_wrapper">
							<script>
								(function() {
									jQuery().ready(function() {
										
										if ( "undefined" === typeof window.tdLazyVideo) {
											
											window.tdLazyVideo = function() {
												
												jQuery("iframe.td-youtube-player-lazy").each(function() {
													var $this = jQuery(this),
														dataSrc = $this.data("src"),
														dataSrcdoc = $this.data("srcdoc");
													
													if ( "undefined" !== typeof dataSrc && "undefined" !== typeof dataSrcdoc ) {
														$this.attr("src", dataSrc);
														if ( true === tdDetect.isPhoneScreen ) {
															$this.attr("srcdoc", dataSrcdoc);
														}
													}
												});
											};
																					
											window.tdLazyVideo();
										}
									});
								})();
							</script>
                        
                        	<iframe
								class="td-youtube-player-lazy"
								width="600" 
								height="560"
								src="" 
								data-src="' . 'https://www.youtube.com/embed/' . urlencode_deep( self::get_youtube_id($videoUrl) ) . '?enablejsapi=1&feature=oembed&wmode=opaque&vq=hd720&' . $autoplayParam . '&' . $controlsParam . '&' . $loopParam . self::get_youtube_time_param($videoUrl) . '"
								data-srcdoc="<style>*{padding:0;margin:0;overflow:hidden}html,body{height:100%;}img{position:absolute;width:100%;top:0;margin:auto}.td-center-align{top: 50%;left: 50%;transform: translate(-50%, -50%);-webkit-transform: translate(-50%, -50%);position: absolute;}</style><a href=https://www.youtube.com/embed/' . self::get_youtube_id($videoUrl) . '?autoplay=1><img src=' . self::get_thumb_url( $videoUrl ) . ' alt=\'' . $value_alt . '\'><span class=\'td-center-align\' style=\'width: 40px;height: 40px;
		background-color: rgba(0, 0, 0, 0.48);border: 2px solid #fff;border-radius: 100%;z-index: 1;-webkit-box-shadow: 0 0 0.15em rgba(0, 0, 0, 0.4);box-shadow: 0 0 0.15em rgba(0, 0, 0, 0.4);\'><span class=\'td-center-align\' style=\'    width: 0;
		height: 0;border-top: 7px solid transparent;border-bottom: 7px solid transparent;border-left: 10px solid #fff;\'></span></span></a>"
								frameborder="0"
								allow="autoplay"
								allowfullscreen></iframe>
                    </div>';

                } else {

                    if ( td_util::is_amp() ) {
						$buffy .= '<div class="wpb_video_wrapper">';
                        $buffy .= '<amp-youtube
                              data-videoid="' . self::get_youtube_id( $videoUrl ) . '"
                              layout="responsive"
                              width="480"
                              height="270"></amp-youtube>';
						$buffy .= '</div>';
					} else {
                        $buffy .= '
                            <div class="wpb_video_wrapper">
                                <iframe class="td-youtube-player" width="600" height="560" src="' . 'https://www.youtube.com/embed/' . urlencode_deep( self::get_youtube_id( $videoUrl ) ) . '?enablejsapi=1&feature=oembed&wmode=opaque&vq=hd720&' . $autoplayParam . '&' . $controlsParam . '&' . $loopParam . self::get_youtube_time_param( $videoUrl ) . '" frameborder="0" allowfullscreen="" allow="autoplay"></iframe>                            
                            </div>';
                    }
			    }

                $buffy .= '
        
                    <script type="text/javascript">
                            
                        jQuery().ready(function() {
                            tdShowVideo.loadApiYoutube(); 
                        });
                        
                    </script>';


				break;
			case 'dailymotion':
                if( $controls == '' ) {
                    $controlsParam = 'controls=false';
                }
                if( $autoplay != '' && !( tdc_state::is_live_editor_ajax() || tdc_state::is_live_editor_iframe() ) ) {
                    $autoplayParam = 'autoplay=1&mute=1';
                }

				$buffy .= '
                    <div class="wpb_video_wrapper">
                        <iframe frameborder="0" width="600" height="560" src="' . td_global::$http_or_https . '://www.dailymotion.com/embed/video/' . self::get_dailymotion_id($videoUrl) . '?' . $controlsParam . '&' . $autoplayParam .  '" allow="autoplay" allowfullscreen></iframe>
                    </div>
                ';
				break;
			case 'vimeo':
			    if( $controls == '' ) {
                    $controlsParam = 'controls=false';
                }
                if( $autoplay != '' && !( tdc_state::is_live_editor_ajax() || tdc_state::is_live_editor_iframe() ) ) {
                    $autoplayParam = 'autoplay=1&muted=1';
                }
                if( $loop != '' ) {
                    $loopParam = 'loop=1';
                }

				$buffy = '
                <div class="wpb_video_wrapper">
                    <iframe src="' . td_global::$http_or_https . '://player.vimeo.com/video/' . self::get_vimeo_id_for_iframe($videoUrl) . $controlsParam . '&' . $autoplayParam . '&' . $loopParam . '" width="500" height="212" frameborder="0" webkitAllowFullScreen mozallowfullscreen allowFullScreen></iframe>
                </div>
                ';
				break;
			case 'facebook':

				// cache & oembed implementation
				$cache_key = self::get_facebook_id($videoUrl);
				$group = 'td_facebook_video';

				if ( td_remote_cache::is_expired( $group, $cache_key ) === true ) {

					// cache is expired - do a request
					$facebook_api_json = td_remote_http::get_page('https://graph.facebook.com/oembed_video?url=' . urlencode($videoUrl) . '&access_token=' .  self::$client_access_token, __CLASS__ );

					if ( $facebook_api_json !== false ) {
						$facebook_api = @json_decode( $facebook_api_json );
						td_log::log(__FILE__, __FUNCTION__, 'facebook api request json', $facebook_api_json );

						//json data decode
						if ( $facebook_api === null and json_last_error() !== JSON_ERROR_NONE ) {
							td_log::log(__FILE__, __FUNCTION__, 'json decode failed for facebook video embed api', $videoUrl);
						}

						if ( is_object( $facebook_api ) and !empty( $facebook_api->html ) ) {

							//add the html to the buffer
							$buffy = '<div class="wpb_video_wrapper">' . $facebook_api->html . '</div>';

							//set the cache
							td_remote_cache::set( $group, $cache_key, $facebook_api->html, self::$caching_time );
						}

					} else {
						td_log::log(__FILE__, __FUNCTION__, 'facebook api html data cannot be retrieved/json request failed', $videoUrl);
					}

				} else {
					// cache is valid
					$api_html_embed_data = td_remote_cache::get($group, $cache_key);
					$buffy = '<div class="wpb_video_wrapper">' . $api_html_embed_data . '</div>';
				}
				break;
			case 'twitter':

				/**
				 * cache & oembed implementation
				 */

				$cache_key = self::get_twitter_id($videoUrl);
				$group = 'td_twitter_video';


				if (td_remote_cache::is_expired($group, $cache_key) === true) {

					// cache is expired - do a request
					$twitter_json = td_remote_http::get_page('https://publish.twitter.com/oembed?url=' . urlencode($videoUrl) . '&widget_type=video&align=center' , __CLASS__);

					if ($twitter_json !== false) {
					$twitter_api = @json_decode($twitter_json);

						//json data decode
						if ($twitter_api === null and json_last_error() !== JSON_ERROR_NONE) {
							td_log::log(__FILE__, __FUNCTION__, 'json decode failed for twitter video embed api', $videoUrl);
						}

						if (is_object($twitter_api) and !empty($twitter_api->html)) {

							//add the html to the buffer
							$buffy = '<div class="wpb_video_wrapper">' . $twitter_api->html . '</div>';
							//embed twitter featured video on AMP
							if(td_util::is_amp()) {
								$buffy = '<amp-twitter width="375"
											  height="472"
											  layout="responsive"
											  data-tweetid="' . $cache_key . '">
										</amp-twitter>';
							}

							//set the cache
							td_remote_cache::set($group, $cache_key, $twitter_api->html, self::$caching_time);
						}

					} else {
						td_log::log(__FILE__, __FUNCTION__, 'twitter api html data cannot be retrieved/json request failed', $videoUrl);
					}

				} else {
					// cache is valid
					$api_html_embed_data = td_remote_cache::get($group, $cache_key);
					$buffy = '<div class="wpb_video_wrapper">' . $api_html_embed_data . '</div>';
					//embed twitter featured video on AMP
					if(td_util::is_amp()) {
						$buffy = '<amp-twitter width="375"
											  height="472"
											  layout="responsive"
											  data-tweetid="' . $cache_key . '">
										</amp-twitter>';
					}
				}

				break;
            case 'self-hosted':
                if ( $controls != '' ) {
                    $controlsParam = 'controls';
                }
                if ( $autoplay != '' && !( tdc_state::is_live_editor_ajax() || tdc_state::is_live_editor_iframe() ) ) {
                    $autoplayParam = 'autoplay muted playsinline';
                }
                if ( $loop != '' ) {
                    $loopParam = 'loop';
                }

                $buffy .= '
                <div class="wpb_video_wrapper">
                    <video ' . $controlsParam . ' ' . $autoplayParam . ' ' . $loopParam .'>
                        <source src="' . esc_url( $videoUrl ) . '">
                        Your browser does not support the video tag.
                    </video>
                </div>';
                break;
        }

		return $buffy;

	}


	/**
	 * Downloads the video thumb on the save_post hook
	 * @param $post_id
     *
     * @updated 06.02.2019 - changed implementation to fix gutenberg compatibility issues
	 */
	static function on_save_post_get_video_thumb($post_id) {

        // bail if this hook has already run
        if( !td_global::get_demo_installing() && self::$on_save_post_did_action ){
            return;
        }

        // if this is the first time this hook runs update the flag to avoid running this again
        self::$on_save_post_did_action = true;

		//verify post is not a revision
		if ( !wp_is_post_revision( $post_id ) ) {

            $post_types = get_post_types( array('_builtin' => false) );
            $post_types_arr = array('post');

            foreach ( $post_types as $post_type ) {
                if ( post_type_supports($post_type, 'post-formats') && has_post_format('video', $post_id) ) {
                    $post_types_arr[] = $post_type;
                }
            }
            //cpt support
			$post_types = apply_filters( 'td_featured_video_support_post_type', $post_types_arr );

			if (
				( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE ) ||
				td_util::tdc_is_live_editor_ajax() ||
				td_util::tdc_is_live_editor_iframe() ||
				! in_array( get_post_type($post_id), $post_types )
			) {
				return;
			}

			// get the current submitted video url and the last saved post video url
			$td_post_video = td_util::get_post_meta_array($post_id, 'td_post_video');
            $td_last_set_video = get_post_meta($post_id, 'td_last_set_video', true);

            // check to see if we have a video url submitted
            if ( empty( $td_post_video['td_video'] ) ) {

                // if we have a last video saved
                if ( !empty( $td_last_set_video ) ) {
                    // if we have an empty video url field and we have a last video saved, empty the last video saved meta..
                    // ..to avoid cases in which we don't have an featured image set and we use the same video url the img does not set
                    update_post_meta( $post_id, 'td_last_set_video', $td_post_video['td_video'] );
                }

                return;
            }

            // check to see if the url is valid
            if ( self::validate_video_url( $td_post_video['td_video'] ) === false ) {
                // we stop here if we do not have a valid video url
                return;
            }

            // check to see if we have a last saved post video url and bail if its the same as the submitted video url
            if ( !empty( $td_last_set_video ) and $td_last_set_video == $td_post_video['td_video'] ) {
                return;
            }

            $videoDuration = self::get_video_duration($td_post_video['td_video']);
            update_post_meta( $post_id, 'td_post_video_duration', $videoDuration );


            $has_featured_image = has_post_thumbnail($post_id);
            $videoThumbUrl = '';

            // download video thumb only if there's not featured image
            if ( !$has_featured_image ) {
                $videoThumbUrl = self::get_thumb_url( $td_post_video['td_video'] );
            }

            // its time to setup the thumb
			if ( $videoThumbUrl !== '' ) {

			    // save the post id
				self::$on_save_post_post_id = $post_id;

				// update the last saved post video url post meta
                update_post_meta( $post_id, 'td_last_set_video', $td_post_video['td_video'] );

				// add the function above to catch the attachments creation
				add_action('add_attachment', array(__CLASS__, 'on_add_attachment_set_featured_image'));

				// load the attachment from the URL
				media_sideload_image($videoThumbUrl, $post_id, $post_id);

				// we have the Image now, and the function above will have fired too setting the thumbnail ID in the process, so lets remove the hook so we don't cause any more trouble
				remove_action('add_attachment', array(__CLASS__, 'on_add_attachment_set_featured_image'));
			}
		}
	}


	/**
	 * set the last uploaded image as a featured image. We 'upload' the video thumb via the media_sideload_image call from above
	 * @internal
	 */
	static function on_add_attachment_set_featured_image($att_id){
		update_post_meta(self::$on_save_post_post_id, '_thumbnail_id', $att_id);
	}


	/**
	 * processes wp embedded youtube videos
	 */
	static function embed_oembed_html_process_embed_html( $html, $url, $attr, $post_ID ){

		/*
		 * add <div class="youtube-embed"> wrapper & youtube video id data for youtube videos
		 */
		// check if the url is of a youtube video
		if ( strpos( $url, 'youtube.com' ) !== false ) {

			// extract the video id from the url
			preg_match( '/[\\?\\&]v=([^\\?\\&]+)/', $url, $matches );

			$video_id = '';
            if ( !empty($matches[1]) ) {
	            $video_id = $matches[1];
            }

			// add the enablejsapi parameter
			$html = str_replace( '?feature=oembed', '?feature=oembed&enablejsapi=1', $html );

			// add a wrap to the html markup
			$new_html = '<div class="youtube-embed" data-video_id="' . $video_id . '">';
			$new_html .= $html;
			$new_html .= '</div>';

			// return the modified html markup
			return $new_html;

		}

		// return the unmodified HTML markup for non-YouTube URLs
		return $html;

	}


	/**
	 * detects if we have a recognized video service and makes sure that it's a valid url
	 * @param $videoUrl
	 * @return bool
	 */
	static function validate_video_url($videoUrl) {
		if (self::detect_video_service($videoUrl) === false) {
			return false;
		}
		if (!preg_match('|^http(s)?://[a-z0-9-]+(.[a-z0-9-]+)*(:[0-9]+)?(/.*)?$|i', $videoUrl)) {
			return false;
		}
		return true;
	}


	/**
	 * Returns the video thumb url from the video URL
	 * @param $videoUrl
	 * @return string
	 */
	protected static function get_thumb_url($videoUrl) {

		switch (self::detect_video_service($videoUrl)) {
			case 'youtube':
				$yt_1920_url = td_global::$http_or_https . '://img.youtube.com/vi/' . self::get_youtube_id($videoUrl) . '/maxresdefault.jpg';
				$yt_640_url  = td_global::$http_or_https . '://img.youtube.com/vi/' . self::get_youtube_id($videoUrl) . '/sddefault.jpg';
				$yt_480_url  = td_global::$http_or_https . '://img.youtube.com/vi/' . self::get_youtube_id($videoUrl) . '/hqdefault.jpg';

				if (!self::is_404($yt_1920_url)) {
					return $yt_1920_url;
				}

				elseif (!self::is_404($yt_640_url)) {
					return $yt_640_url;
				}

				elseif (!self::is_404($yt_480_url)) {
					return $yt_480_url;
				}

				else {
					td_log::log(__FILE__, __FUNCTION__, 'No suitable thumb found for youtube.', $videoUrl);
				}
				break;

			case 'dailymotion':
				$dailymotion_api_json = td_remote_http::get_page('https://api.dailymotion.com/video/' . self::get_dailymotion_id($videoUrl) . '?fields=thumbnail_url', __CLASS__);
				if ($dailymotion_api_json !== false) {
					$dailymotion_api = @json_decode($dailymotion_api_json);
					if ($dailymotion_api === null and json_last_error() !== JSON_ERROR_NONE) {
						td_log::log(__FILE__, __FUNCTION__, 'json decaode failed for daily motion api', $videoUrl);
						return '';
					}

					if (!empty($dailymotion_api) and !empty($dailymotion_api->thumbnail_url)) {
                        $url = $dailymotion_api->thumbnail_url;
                        //without ?ext=.jpeg @media_sideload_image will throw invalid image url
                        $url_with_extension = $url . '?ext=.jpeg';
						return $url_with_extension;
					}
				}
				break;

			case 'vimeo':
				$url = 'http://vimeo.com/api/oembed.json?url=https://vimeo.com/' . self::get_vimeo_id($videoUrl);

				$response = wp_remote_get($url, array(
					'timeout' => 10,
					'sslverify' => false,
					'user-agent' => 'Mozilla/5.0 (Windows NT 6.3; WOW64; rv:35.0) Gecko/20100101 Firefox/35.0'
				));

				if (!is_wp_error($response)) {
					$td_result = @json_decode(wp_remote_retrieve_body($response));
					$result = $td_result->thumbnail_url;
					$result = preg_replace("#_[0-9]+(x)?[0-9]+#", '.jpg', $result);

					return $result;
				}
				break;

			case 'facebook':
				// @since 02.11.2020 the facebook videos thumbnail generator has been discontinued
				break;

			case 'twitter':
                if (!class_exists('TwitterApiClient')) {
                    require_once 'wp-admin/external/twitter-client.php';
                    $Client = new TwitterApiClient;
                    $Client->set_oauth (YOUR_CONSUMER_KEY, YOUR_CONSUMER_SECRET, SOME_ACCESS_KEY, SOME_ACCESS_SECRET);
                    try {
                        $path = 'statuses/show';
                        $args = array (
                            'id' => self::get_twitter_id($videoUrl),
                            'include_entities' => true
                        );
                        $data = $Client->call( $path, $args, 'GET' );


                        //json data decode
                        if ($data === null) {
                            td_log::log(__FILE__, __FUNCTION__, 'api call failed for twitter video thumbnail request api', $videoUrl);
                        }

                        if (empty($data['entities']['media'])){
                            add_filter( 'redirect_post_location', array( __CLASS__, 'td_twitter_notice_on_redirect_post_location' ), 99 );

                        } else  {
                            return $data['entities']['media'][0]['media_url'] . ':large';
                        }
                    }
                    catch( Exception $Ex ){
                        //twitter rate limit will show here
                        //echo 'Caught exception: ',  $Ex->getMessage();
                        //print_r($Ex);
                    }
                } else {
                    add_filter( 'redirect_post_location', array( __CLASS__, 'td_twitter_class_notice_on_redirect_post_location' ), 99 );
                }
		}
		return '';
	}



    /**
     * Returns the video duration from the video URL
     * @param $videoUrl
     * @return string
     */
	static function get_video_duration($videoUrl) {

        switch (self::detect_video_service($videoUrl)) {
            case 'youtube':
                $video_id = self::get_youtube_id($videoUrl);
                $video_info = td_remote_video::api_get_videos_info(array($video_id), 'youtube');

                if( $video_info != FALSE ) {
                    return $video_info[$video_id]['time'];
                }

                break;

            case 'dailymotion':
                $video_id = self::get_dailymotion_id($videoUrl);
                $video_info = td_remote_video::api_get_videos_info(array($video_id), 'dailymotion');

                if( $video_info != FALSE ) {
                    return $video_info[$video_id]['time'];
                }

                break;

            case 'vimeo':
                $video_id = self::get_vimeo_id($videoUrl);
                $video_info = td_remote_video::api_get_videos_info(array($video_id), 'vimeo');

                if( $video_info != FALSE ) {
                    return $video_info[$video_id]['time'];
                }

                break;

            case 'facebook':
            case 'twitter':
                break;

            case 'self-hosted':
                $video_info = wp_get_attachment_metadata( attachment_url_to_postid($videoUrl) );

                if( $video_info != FALSE ) {
                    return gmdate('H:i:s', $video_info['length']);
                }

                break;
        }

        return '';

    }


	/*
	 * youtube
	 */
    private static function get_youtube_id($videoUrl) {
        $query_string = array();

        if (parse_url($videoUrl, PHP_URL_QUERY)) {
            parse_str(parse_url($videoUrl, PHP_URL_QUERY), $query_string);
        }

        if (empty($query_string["v"])) {
            //explode at ? mark
            $yt_short_link_parts_explode1 = explode('?', $videoUrl);

            //short link: http://youtu.be/AgFeZr5ptV8
            $yt_short_link_parts = explode('/', $yt_short_link_parts_explode1[0]);
            if (!empty($yt_short_link_parts[3])) {
                return $yt_short_link_parts[3];
            }

            return $yt_short_link_parts[0];
        } else {
            return $query_string["v"];
        }
    }

    /*
     * youtube t param from url (ex: http://youtu.be/AgFeZr5ptV8?t=5s)
     */
    private static function get_youtube_time_param($videoUrl) {
        $query_string = array();

        if (parse_url($videoUrl, PHP_URL_QUERY)) {
            parse_str(parse_url($videoUrl, PHP_URL_QUERY), $query_string);
        }

        if (!empty($query_string["t"])) {

            if (strpos($query_string["t"], 'm')) {
                //take minutes
                $explode_for_minutes = explode('m', $query_string["t"]);
                $minutes = trim($explode_for_minutes[0]);

                //take seconds
                $explode_for_seconds = explode('s', $explode_for_minutes[1]);
                $seconds = trim($explode_for_seconds[0]);

                $startTime = ($minutes * 60) + $seconds;
            } else {
                //take seconds
                $explode_for_seconds = explode('s', $query_string["t"]);
                $seconds = trim($explode_for_seconds[0]);

                $startTime = $seconds;
            }

            return '&start=' . $startTime;
        } else {
            return '';
        }
    }

    /*
     * Vimeo id
     */
    private static function get_vimeo_id($videoUrl) {

        $path = parse_url($videoUrl, PHP_URL_PATH);
        $pathFragments = explode('/', $path);

        if ( isset($pathFragments[2]) && $pathFragments[2] != '' ) {
            $video_id = ltrim($path, '/');
        } else {
            sscanf($path, '/%d', $video_id);
        }

        return $video_id;
    }

    /*
     * Vimeo id - modified to render unlisted videos
     */
    private static function get_vimeo_id_for_iframe($videoUrl) {

        $path = parse_url($videoUrl, PHP_URL_PATH);
        $pathFragments = explode('/', $path);

        if ( isset($pathFragments[2]) && $pathFragments[2] != '' ) {
            $video_id = $pathFragments [1] . '?h=' . $pathFragments [2] . '&'  ;
        } else {
            sscanf($path, '/%d', $video_id);
            $video_id = $video_id . '?';
        }

        return $video_id;
    }

    /*
     * Dailymotion
     */
    private static function get_dailymotion_id($videoUrl) {
        $id = strtok(basename($videoUrl), '_');
        if (strpos($id,'#video=') !== false) {
            $videoParts = explode('#video=', $id);
            if (!empty($videoParts[1])) {
                return $videoParts[1];
            }
        } else {
            return $id;
        }
		return '';
    }

	/**
	 * Facebook
	 * @param $videoUrl
	 * @return string - the fb video id
	 */
	private static function get_facebook_id($videoUrl) {

		/*
		 * https://www.facebook.com/{page-name}/videos/{video-id}/
		 * https://www.facebook.com/{username}/videos/{video-id}/ - user's video must be public
		 * https://www.facebook.com/video.php?v={video-id}
		 * https://www.facebook.com/video.php?id={video-id} - this video url does not work in this format
		 */

		if (strpos($videoUrl, '//www.facebook.com') !== false) {

			$id = basename($videoUrl);
			if (strpos($id,'video.php?v=') !== false) {
				$query = parse_url($videoUrl, PHP_URL_QUERY);
				parse_str($query, $vars);
				return $vars['v'];
			} else {
				return $id;
			}
		}
		return '';
	}

	/**
	 * Twitter
	 * @param $videoUrl
	 * @return string - the tweet id
	 */
	private static function get_twitter_id($videoUrl) {

		/**
		 * https://twitter.com/video/status/760619209114071040
		 */

		if (strpos($videoUrl, 'twitter.com') !== false) {
			$id = basename($videoUrl);
			return $id;
		}
		return '';
	}

	/**
	 * appends a query variable to the URL query, to show the 'non supported embeddable twitter videos' notice, on the redirect_post_location hook
	 * @param $location - the destination URL
	 * @return mixed
	 */
	static function td_twitter_notice_on_redirect_post_location( $location ) {
		remove_filter( 'redirect_post_location', array( __CLASS__, 'td_twitter_notice_on_redirect_post_location' ), 99 );
		return add_query_arg( 'td_twitter_video', 'error_notice', $location );
	}

	/**
	 * the twitter video notice for non supported embeddable twitter videos
	 */
	static function td_twitter_on_admin_notices() {
		if ( ! isset( $_GET['td_twitter_video'] ) ) {
			return;
		}

		?>
		<div class="notice notice-error is-dismissible">
			<p>Sorry, but the twitter video you have used is not supported by twitter api, so the video thumb image cannot be retrieved!<br>
			Some twitter videos, like Vine and Amplify or other content videos are not available through the twitter API therefore resources, like video thumb images, are not available.</p>
		</div>
		<?php
	}

	/**
	 * appends a query variable to the URL query, to show the 'class already defined' notice, on the redirect_post_location hook
	 * @param $location - the destination URL
	 * @return mixed
	 */
	static function td_twitter_class_notice_on_redirect_post_location( $location ) {
		remove_filter( 'redirect_post_location', array( __CLASS__, 'td_twitter_class_notice_on_redirect_post_location' ), 99 );
		return add_query_arg( 'td_twitter_video_class', 'class_notice', $location );
	}

	/**
	 * the twitter video notice for class already defined
	 */
	static function td_twitter_class_on_admin_notices() {
		if ( ! isset( $_GET['td_twitter_video_class'] ) ) {
			return;
		}

		?>
		<div class="notice notice-error">
			<p>The twitter api class is already defined! It might have been already defined by one of your plugins so please try without having any plugins active!</p>
		</div>
		<?php
	}

    /*
     * Detect the video service from url
     */
    static function detect_video_service($videoUrl) {
        $videoUrl = strtolower($videoUrl);
        if (strpos($videoUrl,'youtube.com') !== false or strpos($videoUrl,'youtu.be') !== false) {
            return 'youtube';
        }
        if (strpos($videoUrl,'dailymotion.com') !== false) {
            return 'dailymotion';
        }
        if (strpos($videoUrl,'vimeo.com') !== false) {
            return 'vimeo';
        }
		if (strpos($videoUrl,'facebook.com') !== false) {
			return 'facebook';
		}

		if (strpos($videoUrl,'twitter.com') !== false) {
			return 'twitter';
		}

		if(preg_match('(.mp4|.m4v|.mov|.wmv|.avi|.mpg|.ogv|.3gp|.3g2|.webm|.ogg)', $videoUrl) != false) {
		    return 'self-hosted';
        }

		return false;
    }

	/**
	 * detect a 404 page
	 * @param $url
	 * @return bool
	 */
    private static function is_404($url) {
        $headers = @get_headers($url);
	    if (!empty($headers[0]) and strpos($headers[0],'404') !== false) {
		    return true;
	    }
	    return false;
    }


}

