<?php
/**
* Widget API: WP_Widget_Block class
*
* @package WordPress
* @subpackage Widgets
* @since 5.8.0
*/

/**
* Core class used to implement a Block widget.
*
* @since 5.8.0
*
* @see WP_Widget
*/
class WP_Widget_Block extends WP_Widget {

/**
* Default instance.
*
* @since 5.8.0
* @var array
*/
protected $default_instance = array(
'content' => '',
);

/**
* Sets up a new Block widget instance.
*
* @since 5.8.0
*/
public function __construct() {
$widget_ops = array(
'classname' => 'widget_block',
'description' => __( 'A widget containing a block.' ),
'customize_selective_refresh' => true,
'show_instance_in_rest' => true,
);
$control_ops = array(
'width' => 400,
'height' => 350,
);
parent::__construct( 'block', __( 'Block' ), $widget_ops, $control_ops );

add_filter( 'is_wide_widget_in_customizer', array( $this, 'set_is_wide_widget_in_customizer' ), 10, 2 );
}

/**
* Outputs the content for the current Block widget instance.
*
* @since 5.8.0
*
* @param array $args Display arguments including 'before_title', 'after_title',
* 'before_widget', and 'after_widget'.
* @param array $instance Settings for the current Block widget instance.
*/
public function widget( $args, $instance ) {
$instance = wp_parse_args( $instance, $this->default_instance );

echo str_replace(
'widget_block',
$this->get_dynamic_classname( $instance['content'] ),
$args['before_widget']
);

/**
* Filters the content of the Block widget before output.
*
* @since 5.8.0
*
* @param string $content The widget content.
* @param array $instance Array of settings for the current widget.
* @param WP_Widget_Block $widget Current Block widget instance.
*/
echo apply_filters(
'widget_block_content',
$instance['content'],
$instance,
$this
);

echo $args['after_widget'];
}

/**
* Calculates the classname to use in the block widget's container HTML.
*
* Usually this is set to `$this->widget_options['classname']` by
* dynamic_sidebar(). In this case, however, we want to set the classname
* dynamically depending on the block contained by this block widget.
*
* If a block widget contains a block that has an equivalent legacy widget,
* we display that legacy widget's class name. This helps with theme
* backwards compatibility.
*
* @since 5.8.0
*
* @param string $content The HTML content of the current block widget.
* @return string The classname to use in the block widget's container HTML.
*/
private function get_dynamic_classname( $content ) {
$blocks = parse_blocks( $content );

$block_name = isset( $blocks[0] ) ? $blocks[0]['blockName'] : null;

switch ( $block_name ) {
case 'core/paragraph':
$classname = 'widget_block widget_text';
break;
case 'core/calendar':
$classname = 'widget_block widget_calendar';
break;
case 'core/search':
$classname = 'widget_block widget_search';
break;
case 'core/html':
$classname = 'widget_block widget_custom_html';
break;
case 'core/archives':
$classname = 'widget_block widget_archive';
break;
case 'core/latest-posts':
$classname = 'widget_block widget_recent_entries';
break;
case 'core/latest-comments':
$classname = 'widget_block widget_recent_comments';
break;
case 'core/tag-cloud':
$classname = 'widget_block widget_tag_cloud';
break;
case 'core/categories':
$classname = 'widget_block widget_categories';
break;
case 'core/audio':
$classname = 'widget_block widget_media_audio';
break;
case 'core/video':
$classname = 'widget_block widget_media_video';
break;
case 'core/image':
$classname = 'widget_block widget_media_image';
break;
case 'core/gallery':
$classname = 'widget_block widget_media_gallery';
break;
case 'core/rss':
$classname = 'widget_block widget_rss';
break;
default:
$classname = 'widget_block';
}

/**
* The classname used in the block widget's container HTML.
*
* This can be set according to the name of the block contained by the block widget.
*
* @since 5.8.0
*
* @param string $classname The classname to be used in the block widget's container HTML,
* e.g. 'widget_block widget_text'.
* @param string $block_name The name of the block contained by the block widget,
* e.g. 'core/paragraph'.
*/
return apply_filters( 'widget_block_dynamic_classname', $classname, $block_name );
}

/**
* Handles updating settings for the current Block widget instance.
*
* @since 5.8.0

* @param array $new_instance New settings for this instance as input by the user via
* WP_Widget::form().
* @param array $old_instance Old settings for this instance.
* @return array Settings to save or bool false to cancel saving.
*/
public function update( $new_instance, $old_instance ) {
$instance = array_merge( $this->default_instance, $old_instance );

if ( current_user_can( 'unfiltered_html' ) ) {
$instance['content'] = $new_instance['content'];
} else {
$instance['content'] = wp_kses_post( $new_instance['content'] );
}

return $instance;
}

/**
* Outputs the Block widget settings form.
*
* @since 5.8.0
*
* @see WP_Widget_Custom_HTML::render_control_template_scripts()
*
* @param array $instance Current instance.
*/
public function form( $instance ) {
$instance = wp_parse_args( (array) $instance, $this->default_instance );
?>
<p>
<label for="<?php echo $this->get_field_id( 'content' ); ?>">
<?php
/* translators: HTML code of the block, not an option that blocks HTML. */
_e( 'Block HTML:' );
?>
</label>
<textarea id="<?php echo $this->get_field_id( 'content' ); ?>" name="<?php echo $this->get_field_name( 'content' ); ?>" rows="6" cols="50" class="widefat code"><?php echo esc_textarea( $instance['content'] ); ?></textarea>
</p>
<?php
}

/**
* Makes sure no block widget is considered to be wide.
*
* @since 5.8.0
*
* @param bool $is_wide Whether the widget is considered wide.
* @param string $widget_id Widget ID.
* @return bool Updated `is_wide` value.
*/
public function set_is_wide_widget_in_customizer( $is_wide, $widget_id ) {
if ( str_starts_with( $widget_id, 'block-' ) ) {
return false;
}

return $is_wide;
}
}