<?php

/**

 * Widget API: WP_Media_Widget class

 *

 * @package WordPress

 * @subpackage Widgets

 * @since 4.8.0

 */

/**

 * Core class that implements a media widget.

 *

 * @since 4.8.0

 *

 * @see WP_Widget

 */

abstract class WP_Widget_Media extends WP_Widget {

	/**

	 * Translation labels.

	 *

	 * @since 4.8.0

	 * @var array

	 */

	public $l10n = array(

		'add_to_widget'              => '',

		'replace_media'              => '',

		'edit_media'                 => '',

		'media_library_state_multi'  => '',

		'media_library_state_single' => '',

		'missing_attachment'         => '',

		'no_media_selected'          => '',

		'add_media'                  => '',

	);

	/**

	 * Whether or not the widget has been registered yet.

	 *

	 * @since 4.8.1

	 * @var bool

	 */

	protected $registered = false;

	/**

	 * Constructor.

	 *

	 * @since 4.8.0

	 *

	 * @param string $id_base         Base ID for the widget, lowercase and unique.

	 * @param string $name            Name for the widget displayed on the configuration page.

	 * @param array  $widget_options  Optional. Widget options. See wp_register_sidebar_widget() for

	 *                                information on accepted arguments. Default empty array.

	 * @param array  $control_options Optional. Widget control options. See wp_register_widget_control()

	 *                                for information on accepted arguments. Default empty array.

	 */

	public function __construct( $id_base, $name, $widget_options = array(), $control_options = array() ) {

		$widget_opts = wp_parse_args(

			$widget_options,

			array(

				'description'                 => __( 'A media item.' ),

				'customize_selective_refresh' => true,

				'mime_type'                   => '',

			)

		);

		$control_opts = wp_parse_args( $control_options, array() );

		$l10n_defaults = array(

			'no_media_selected'          => __( 'No media selected' ),

			'add_media'                  => _x( 'Add Media', 'label for button in the media widget' ),

			'replace_media'              => _x( 'Replace Media', 'label for button in the media widget; should preferably not be longer than ~13 characters long' ),

			'edit_media'                 => _x( 'Edit Media', 'label for button in the media widget; should preferably not be longer than ~13 characters long' ),

			'add_to_widget'              => __( 'Add to Widget' ),

			'missing_attachment'         => sprintf(

				__( 'We can&#8217;t find that file. Check your <a href="%s">media library</a> and make sure it wasn&#8217;t deleted.' ),

				esc_url( admin_url( 'upload.php' ) )

			),

			'media_library_state_multi'  => _n_noop( 'Media Widget (%d)', 'Media Widget (%d)' ),

			'media_library_state_single' => __( 'Media Widget' ),

			'unsupported_file_type'      => __( 'Looks like this isn’t the correct kind of file. Please link to an appropriate file instead.' ),

		);

		$this->l10n    = array_merge( $l10n_defaults, array_filter( $this->l10n ) );

		parent::__construct(

			$id_base,

			$name,

			$widget_opts,

			$control_opts

		);

	}

	/**

	 * Add hooks while registering all widget instances of this widget class.

	 *

	 * @since 4.8.0

	 *

	 * @param integer $number Optional. The unique order number of this widget instance

	 *                        compared to other instances of the same class. Default -1.

	 */

	public function _register_one( $number = -1 ) {

		parent::_register_one( $number );

		if ( $this->registered ) {

			return;

		}

		$this->registered = true;

		add_action( 'admin_print_scripts-widgets.php', array( $this, 'enqueue_admin_scripts' ) );

		if ( $this->is_preview() ) {

			add_action( 'wp_enqueue_scripts', array( $this, 'enqueue_preview_scripts' ) );

		}

		add_action( 'admin_footer-widgets.php', array( $this, 'render_control_template_scripts' ) );

		add_filter( 'display_media_states', array( $this, 'display_media_state' ), 10, 2 );

	}

	/**

	 * Get schema for properties of a widget instance (item).

	 *

	 * @since 4.8.0

	 *

	 * @see WP_REST_Controller::get_item_schema()

	 * @see WP_REST_Controller::get_additional_fields()

	 * @link https://core.trac.wordpress.org/ticket/35574

	 * @return array Schema for properties.

	 */

	public function get_instance_schema() {

		$schema = array(

			'attachment_id' => array(

				'type'        => 'integer',

				'default'     => 0,

				'minimum'     => 0,

				'description' => __( 'Attachment post ID' ),

				'media_prop'  => 'id',

			),

			'url'           => array(

				'type'        => 'string',

				'default'     => '',

				'format'      => 'uri',

				'description' => __( 'URL to the media file' ),

			),

			'title'         => array(

				'type'                  => 'string',

				'default'               => '',

				'sanitize_callback'     => 'sanitize_text_field',

				'description'           => __( 'Title for the widget' ),

				'should_preview_update' => false,

			),

		);

		/**

		 * Filters the media widget instance schema to add additional properties.

		 *

		 * @since 4.9.0

		 *

		 * @param array           $schema Instance schema.

		 * @param WP_Widget_Media $this   Widget object.

		 */

		$schema = apply_filters( "widget_{$this->id_base}_instance_schema", $schema, $this );

		return $schema;

	}

	/**

	 * Determine if the supplied attachment is for a valid attachment post with the specified MIME type.

	 *

	 * @since 4.8.0

	 *

	 * @param int|WP_Post $attachment Attachment post ID or object.

	 * @param string      $mime_type  MIME type.

	 * @return bool Is matching MIME type.

	 */

	public function is_attachment_with_mime_type( $attachment, $mime_type ) {

		if ( empty( $attachment ) ) {

			return false;

		}

		$attachment = get_post( $attachment );

		if ( ! $attachment ) {

			return false;

		}

		if ( 'attachment' !== $attachment->post_type ) {

			return false;

		}

		return wp_attachment_is( $mime_type, $attachment );

	}

	/**

	 * Sanitize a token list string, such as used in HTML rel and class attributes.

	 *

	 * @since 4.8.0

	 *

	 * @link http://w3c.github.io/html/infrastructure.html#space-separated-tokens

	 * @link https://developer.mozilla.org/en-US/docs/Web/API/DOMTokenList

	 * @param string|array $tokens List of tokens separated by spaces, or an array of tokens.

	 * @return string Sanitized token string list.

	 */

	public function sanitize_token_list( $tokens ) {

		if ( is_string( $tokens ) ) {

			$tokens = preg_split( '/\s+/', trim( $tokens ) );

		}

		$tokens = array_map( 'sanitize_html_class', $tokens );

		$tokens = array_filter( $tokens );

		return join( ' ', $tokens );

	}

	/**

	 * Displays the widget on the front-end.

	 *

	 * @since 4.8.0

	 *

	 * @see WP_Widget::widget()

	 *

	 * @param array $args     Display arguments including before_title, after_title, before_widget, and after_widget.

	 * @param array $instance Saved setting from the database.

	 */

	public function widget( $args, $instance ) {

		$instance = wp_parse_args( $instance, wp_list_pluck( $this->get_instance_schema(), 'default' ) );

		// Short-circuit if no media is selected.

		if ( ! $this->has_content( $instance ) ) {

			return;

		}

		echo $args['before_widget'];

		/** This filter is documented in wp-includes/widgets/class-wp-widget-pages.php */

		$title = apply_filters( 'widget_title', $instance['title'], $instance, $this->id_base );

		if ( $title ) {

			echo $args['before_title'] . $title . $args['after_title'];

		}

		/**

		 * Filters the media widget instance prior to rendering the media.

		 *

		 * @since 4.8.0

		 *

		 * @param array           $instance Instance data.

		 * @param array           $args     Widget args.

		 * @param WP_Widget_Media $this     Widget object.

		 */

		$instance = apply_filters( "widget_{$this->id_base}_instance", $instance, $args, $this );

		$this->render_media( $instance );

		echo $args['after_widget'];

	}

	/**

	 * Sanitizes the widget form values as they are saved.

	 *

	 * @since 4.8.0

	 *

	 * @see WP_Widget::update()

	 * @see WP_REST_Request::has_valid_params()

	 * @see WP_REST_Request::sanitize_params()

	 *

	 * @param array $new_instance Values just sent to be saved.

	 * @param array $instance     Previously saved values from database.

	 * @return array Updated safe values to be saved.

	 */

	public function update( $new_instance, $instance ) {

		$schema = $this->get_instance_schema();

		foreach ( $schema as $field => $field_schema ) {

			if ( ! array_key_exists( $field, $new_instance ) ) {

				continue;

			}

			$value = $new_instance[ $field ];

			if ( 'boolean' === $field_schema['type'] && '' === $value ) {

				$value = false;

			}

			if ( true !== rest_validate_value_from_schema( $value, $field_schema, $field ) ) {

				continue;

			}

			$value = rest_sanitize_value_from_schema( $value, $field_schema );

			// @codeCoverageIgnoreStart

			if ( is_wp_error( $value ) ) {

				continue; // Handle case when rest_sanitize_value_from_schema() ever returns WP_Error as its phpdoc @return tag indicates.

			}

			// @codeCoverageIgnoreEnd

			if ( isset( $field_schema['sanitize_callback'] ) ) {

				$value = call_user_func( $field_schema['sanitize_callback'], $value );

			}

			if ( is_wp_error( $value ) ) {

				continue;

			}

			$instance[ $field ] = $value;

		}

		return $instance;

	}

	/**

	 * Render the media on the frontend.

	 *

	 * @since 4.8.0

	 *

	 * @param array $instance Widget instance props.

	 * @return string

	 */

	abstract public function render_media( $instance );

	/**

	 * Outputs the settings update form.

	 *

	 * Note that the widget UI itself is rendered with JavaScript via `MediaWidgetControl#render()`.

	 *

	 * @since 4.8.0

	 *

	 * @see \WP_Widget_Media::render_control_template_scripts() Where the JS template is located.

	 * @param array $instance Current settings.

	 */

	final public function form( $instance ) {

		$instance_schema = $this->get_instance_schema();

		$instance        = wp_array_slice_assoc(

			wp_parse_args( (array) $instance, wp_list_pluck( $instance_schema, 'default' ) ),

			array_keys( $instance_schema )

		);

		foreach ( $instance as $name => $value ) : ?>

			<input

				type="hidden"

				data-property="<?php echo esc_attr( $name ); ?>"

				class="media-widget-instance-property"

				name="<?php echo esc_attr( $this->get_field_name( $name ) ); ?>"

				id="<?php echo esc_attr( $this->get_field_id( $name ) ); // Needed specifically by wpWidgets.appendTitle(). ?>"

				value="<?php echo esc_attr( is_array( $value ) ? join( ',', $value ) : strval( $value ) ); ?>"

			/>

			<?php

		endforeach;

	}

	/**

	 * Filters the default media display states for items in the Media list table.

	 *

	 * @since 4.8.0

	 *

	 * @param array   $states An array of media states.

	 * @param WP_Post $post   The current attachment object.

	 * @return array

	 */

	public function display_media_state( $states, $post = null ) {

		if ( ! $post ) {

			$post = get_post();

		}

		// Count how many times this attachment is used in widgets.

		$use_count = 0;

		foreach ( $this->get_settings() as $instance ) {

			if ( isset( $instance['attachment_id'] ) && $instance['attachment_id'] === $post->ID ) {

				$use_count++;

			}

		}

		if ( 1 === $use_count ) {

			$states[] = $this->l10n['media_library_state_single'];

		} elseif ( $use_count > 0 ) {

			$states[] = sprintf( translate_nooped_plural( $this->l10n['media_library_state_multi'], $use_count ), number_format_i18n( $use_count ) );

		}

		return $states;

	}

	/**

	 * Enqueue preview scripts.

	 *

	 * These scripts normally are enqueued just-in-time when a widget is rendered.

	 * In the customizer, however, widgets can be dynamically added and rendered via

	 * selective refresh, and so it is important to unconditionally enqueue them in

	 * case a widget does get added.

	 *

	 * @since 4.8.0

	 */

	public function enqueue_preview_scripts() {}

	/**

	 * Loads the required scripts and styles for the widget control.

	 *

	 * @since 4.8.0

	 */

	public function enqueue_admin_scripts() {

		wp_enqueue_media();

		wp_enqueue_script( 'media-widgets' );

	}

	/**

	 * Render form template scripts.

	 *

	 * @since 4.8.0

	 */

	public function render_control_template_scripts() {

		?>

		<script type="text/html" id="tmpl-widget-media-<?php echo esc_attr( $this->id_base ); ?>-control">

			<# var elementIdPrefix = 'el' + String( Math.random() ) + '_' #>

			<p>

				<label for="{{ elementIdPrefix }}title"><?php esc_html_e( 'Title:' ); ?></label>

				<input id="{{ elementIdPrefix }}title" type="text" class="widefat title">

			</p>

			<div class="media-widget-preview <?php echo esc_attr( $this->id_base ); ?>">

				<div class="attachment-media-view">

					<button type="button" class="select-media button-add-media not-selected">

						<?php echo esc_html( $this->l10n['add_media'] ); ?>

					</button>

				</div>

			</div>

			<p class="media-widget-buttons">

				<button type="button" class="button edit-media selected">

					<?php echo esc_html( $this->l10n['edit_media'] ); ?>

				</button>

			<?php if ( ! empty( $this->l10n['replace_media'] ) ) : ?>

				<button type="button" class="button change-media select-media selected">

					<?php echo esc_html( $this->l10n['replace_media'] ); ?>

				</button>

			<?php endif; ?>

			</p>

			<div class="media-widget-fields">

			</div>