.
 *
 */
if ( ! defined( 'ABSPATH' ) ) {
	exit;
}
class AudioIgniter {
	/**
	 * AudioIgniter version.
	 *
	 * @var string
	 * @since 1.0.0
	 * @since 1.7.0 Changed from static to non-static.
	 */
	public $version = null;
	/**
	 * Instance of this class.
	 *
	 * @var AudioIgniter
	 * @since 1.0.0
	 */
	protected static $instance = null;
	/**
	 * Sanitizer instance.
	 *
	 * @var AudioIgniter_Sanitizer
	 * @since 1.0.0
	 */
	public $sanitizer = null;
	/**
	 * The URL directory path (with trailing slash) of the main plugin file.
	 *
	 * @var string
	 * @since 1.0.0
	 */
	protected static $plugin_url = '';
	/**
	 * The filesystem directory path (with trailing slash) of the main plugin file.
	 *
	 * @var string
	 * @since 1.0.0
	 */
	protected static $plugin_path = '';
	/**
	 * Playlist post type name.
	 *
	 * @var string
	 * @since 1.0.0
	 */
	public $post_type = 'ai_playlist';
	/**
	 * AudioIgniter Instance.
	 *
	 * Instantiates or reuses an instance of AudioIgniter.
	 *
	 * @since 1.0.0
	 * @static
	 * @see AudioIgniter()
	 * @return AudioIgniter - Single instance.
	 */
	public static function instance() {
		if ( is_null( self::$instance ) ) {
			self::$instance = new self();
		}
		return self::$instance;
	}
	/**
	 * AudioIgniter constructor. Intentionally left empty so that instances can be created without
	 * re-loading of resources (e.g. scripts/styles), or re-registering hooks.
	 * http://wordpress.stackexchange.com/questions/70055/best-way-to-initiate-a-class-in-a-wp-plugin
	 * https://gist.github.com/toscho/3804204
	 *
	 * @since 1.0.0
	 */
	public function __construct() {}
	/**
	 * Kickstarts plugin loading.
	 *
	 * @since 1.0.0
	 */
	public function plugin_setup() {
		if ( is_null( $this->version ) ) {
			if ( ! function_exists( 'get_plugin_data' ) ) {
				include_once ABSPATH . 'wp-admin/includes/plugin.php';
			}
			$plugin_data = get_plugin_data( __FILE__ );
			$this->version = $plugin_data['Version'];
		}
		self::$plugin_url  = plugin_dir_url( __FILE__ );
		self::$plugin_path = plugin_dir_path( __FILE__ );
		load_plugin_textdomain( 'audioigniter', false, dirname( self::plugin_basename() ) . '/languages' );
		require_once untrailingslashit( $this->plugin_path() ) . '/inc/class-audioigniter-sanitizer.php';
		$this->sanitizer = new AudioIgniter_Sanitizer();
//		if ( ! class_exists( 'AudioIgniter_Pro', false ) ) {
//			require_once untrailingslashit( $this->plugin_path() ) . '/inc/class-audioigniter-admin-page-upsell.php';
//			new AudioIgniter_Admin_Page_Upsell();
//		}
		// Initialization needed in every request.
		$this->init();
		// Initialization needed in admin requests.
		$this->admin_init();
		// Initialization needed in frontend requests.
		$this->frontend_init();
		do_action( 'audioigniter_loaded' );
	}
	/**
	 * Registers actions that need to be run on both admin and frontend
	 *
	 * @since 1.0.0
	 */
	protected function init() {
		add_action( 'init', array( $this, 'register_post_types' ) );
		add_action( 'init', array( $this, 'register_scripts' ) );
		add_action( 'init', array( $this, 'register_playlist_endpoint' ) );
		add_action( 'init', array( $this, 'register_image_sizes' ) );
		add_action( 'init', array( $this, 'register_shortcodes' ) );
		add_action( 'widgets_init', array( $this, 'register_widgets' ) );
		do_action( 'audioigniter_init' );
	}
	/**
	 * Registers actions that need to be run on admin only.
	 *
	 * @since 1.0.0
	 */
	protected function admin_init() {
		if ( ! is_admin() ) {
			return;
		}
		add_action( 'admin_enqueue_scripts', array( $this, 'enqueue_admin_scripts' ) );
		add_action( 'add_meta_boxes', array( $this, 'add_meta_boxes' ) );
		add_action( 'save_post', array( $this, 'save_post' ) );
		add_filter( "manage_{$this->post_type}_posts_columns", array( $this, 'filter_posts_columns' ) );
		add_action( "manage_{$this->post_type}_posts_custom_column", array( $this, 'add_custom_columns' ), 10, 2 );
		do_action( 'audioigniter_admin_init' );
	}
	/**
	 * Registers actions that need to be run on frontend only.
	 *
	 * @since 1.0.0
	 */
	protected function frontend_init() {
		if ( is_admin() ) {
			return;
		}
		add_action( 'wp_enqueue_scripts', array( $this, 'enqueue_scripts' ) );
		add_action( 'template_redirect', array( $this, 'handle_playlist_endpoint' ) );
		do_action( 'audioigniter_frontend_init' );
	}
	/**
	 * Register (but not enqueue) all scripts and styles to be used throughout the plugin.
	 *
	 * @since 1.0.0
	 */
	public function register_scripts() {
		wp_register_style( 'audioigniter', untrailingslashit( $this->plugin_url() ) . '/player/build/style.css', array(), $this->version );
		wp_register_script( 'audioigniter', untrailingslashit( $this->plugin_url() ) . '/player/build/app.js', array(), $this->version, true );
		wp_localize_script( 'audioigniter', 'aiStrings', apply_filters( 'audioigniter_aiStrings', array(
			/* translators: %s is the track's title. */
			'play_title'          => esc_html__( 'Play %s', 'audioigniter' ),
			/* translators: %s is the track's title. */
			'pause_title'         => esc_html__( 'Pause %s', 'audioigniter' ),
			'previous'            => esc_html__( 'Previous track', 'audioigniter' ),
			'next'                => esc_html__( 'Next track', 'audioigniter' ),
			'toggle_list_repeat'  => esc_html__( 'Toggle track listing repeat', 'audioigniter' ),
			'toggle_track_repeat' => esc_html__( 'Toggle track repeat' ),
			'toggle_list_visible' => esc_html__( 'Toggle track listing visibility', 'audioigniter' ),
			'buy_track'           => esc_html__( 'Buy this track', 'audioigniter' ),
			'download_track'      => esc_html__( 'Download this track', 'audioigniter' ),
			'volume_up'           => esc_html__( 'Volume Up', 'audioigniter' ),
			'volume_down'         => esc_html__( 'Volume Down', 'audioigniter' ),
			'open_track_lyrics'   => esc_html__( 'Open track lyrics', 'audioigniter' ),
			'set_playback_rate'   => esc_html__( 'Set playback rate', 'audioigniter' ),
			'skip_forward'        => esc_html__( 'Skip forward', 'audioigniter' ),
			'skip_backward'       => esc_html__( 'Skip backward', 'audioigniter' ),
			'shuffle'             => esc_html__( 'Shuffle', 'audioigniter' ),
		) ) );
		wp_localize_script( 'audioigniter', 'aiStats', array(
			'enabled' => get_option( 'audioigniter_stats_enabled' ) && class_exists( 'AudioIgniter_Pro' ),
			'apiUrl'  => get_rest_url( null, 'audioigniter/v1' ),
		) );
		wp_register_style( 'audioigniter-admin', untrailingslashit( $this->plugin_url() ) . '/assets/css/admin-styles.css', array(), $this->version );
		wp_register_script( 'audioigniter-admin', untrailingslashit( $this->plugin_url() ) . '/assets/js/audioigniter.js', array(), $this->version, true );
		wp_localize_script( 'audioigniter-admin', 'ai_scripts', array(
			'messages' => array(
				'confirm_clear_tracks'     => esc_html__( 'Do you really want to remove all tracks? (This will not delete your audio files).', 'audioigniter' ),
				'media_title_upload'       => esc_html__( 'Select or upload audio media', 'audioigniter' ),
				'media_title_upload_cover' => esc_html__( 'Select a cover image', 'audioigniter' ),
			),
		) );
		wp_register_style( 'audioigniter-admin-settings', untrailingslashit( $this->plugin_url() ) . '/assets/css/admin/settings.css', array(), $this->version );
	}
	/**
	 * Enqueues frontend scripts and styles.
	 *
	 * @since 1.0.0
	 */
	public function enqueue_scripts() {
		wp_enqueue_style( 'audioigniter' );
		wp_enqueue_script( 'audioigniter' );
	}
	/**
	 * Enqueues admin scripts and styles.
	 *
	 * @since 1.0.0
	 */
	public function enqueue_admin_scripts( $hook ) {
		$screen = get_current_screen();
		if ( 'post' === $screen->base && $screen->post_type === $this->post_type ) {
			wp_enqueue_media();
			wp_enqueue_style( 'audioigniter-admin' );
			wp_enqueue_script( 'audioigniter-admin' );
		}
//		if ( 'ai_playlist_page_audioigniter-upsell' === $screen->id ) {
//			wp_enqueue_style( 'audioigniter-admin-settings' );
//		}
	}
	/**
	 * Post types registration.
	 *
	 * @since 1.0.0
	 */
	public function register_post_types() {
		$labels = array(
			'name'               => esc_html_x( 'Playlists', 'post type general name', 'audioigniter' ),
			'singular_name'      => esc_html_x( 'Playlist', 'post type singular name', 'audioigniter' ),
			'menu_name'          => esc_html_x( 'AudioIgniter', 'admin menu', 'audioigniter' ),
			'all_items'          => esc_html_x( 'All Playlists', 'admin menu', 'audioigniter' ),
			'name_admin_bar'     => esc_html_x( 'Playlist', 'add new on admin bar', 'audioigniter' ),
			'add_new'            => esc_html__( 'Add New Playlist', 'audioigniter' ),
			'add_new_item'       => esc_html__( 'Add New Playlist', 'audioigniter' ),
			'edit_item'          => esc_html__( 'Edit Playlist', 'audioigniter' ),
			'new_item'           => esc_html__( 'New Playlist', 'audioigniter' ),
			'view_item'          => esc_html__( 'View Playlist', 'audioigniter' ),
			'search_items'       => esc_html__( 'Search Playlists', 'audioigniter' ),
			'not_found'          => esc_html__( 'No playlists found', 'audioigniter' ),
			'not_found_in_trash' => esc_html__( 'No playlists found in the trash', 'audioigniter' ),
		);
		$args = array(
			'labels'          => $labels,
			'singular_label'  => esc_html_x( 'Playlist', 'post type singular name', 'audioigniter' ),
			'public'          => false,
			'show_ui'         => true,
			'capability_type' => 'post',
			'hierarchical'    => false,
			'has_archive'     => false,
			'supports'        => array( 'title' ),
			'menu_icon'       => 'dashicons-controls-volumeon',
		);
		register_post_type( $this->post_type, $args );
	}
	/**
	 * Registers metaboxes for the ai_playlist post type.
	 *
	 * @since 1.0.0
	 */
	public function add_meta_boxes() {
		add_meta_box( 'ai-meta-box-tracks', esc_html__( 'Tracks', 'audioigniter' ), array( $this, 'metabox_tracks' ), $this->post_type, 'normal', 'high' );
		add_meta_box( 'ai-meta-box-settings', esc_html__( 'Settings', 'audioigniter' ), array( $this, 'metabox_settings' ), $this->post_type, 'normal', 'high' );
		add_meta_box( 'ai-meta-box-shortcode', esc_html__( 'Shortcode', 'audioigniter' ), array( $this, 'metabox_shortcode' ), $this->post_type, 'side', 'default' );
	}
	/**
	 * Echoes the Tracks metabox markup.
	 *
	 * @since 1.0.0
	 *
	 * @param WP_Post $object
	 * @param array $box
	 */
	public function metabox_tracks( $object, $box ) {
		$tracks = $this->get_post_meta( $object->ID, '_audioigniter_tracks', array() );
		wp_nonce_field( basename( __FILE__ ), $object->post_type . '_nonce' );
		?>
		metabox_tracks_header(); ?>
		
			metabox_tracks_field_controls( 'top', $object->ID ); ?>
			
			
				metabox_tracks_repeatable_track_field( $track );
						}
					} else {
						$this->metabox_tracks_repeatable_track_field();
					}
				?>
			
			metabox_tracks_field_controls( 'bottom', $object->ID ); ?>