<?php

require_once AMP__DIR__ . '/includes/sanitizers/class-amp-base-sanitizer.php';

/**
 * Converts Playbuzz embed to <amp-playbuzz>
 */
class AMP_Playbuzz_Sanitizer extends AMP_Base_Sanitizer {


	public static $tag = 'div';
	public static $pb_class = 'pb_feed';
	private static $script_slug = 'amp-playbuzz';
	private static $height = '500';
	private static $script_src = 'https://cdn.ampproject.org/v0/amp-playbuzz-0.1.js';


	public function get_scripts() {
		if ( ! $this->did_convert_elements ) {
			return array();
		}
		return array(
			self::$script_slug => self::$script_src,
		);
	}


	public function sanitize() {

		$nodes = $this->dom->getElementsByTagName( self::$tag );
		$num_nodes = $nodes->length;

		if ( 0 === $num_nodes ) {

			return;

		}

		for ( $i = $num_nodes - 1; $i >= 0; $i-- ) {
			$node = $nodes->item( $i );

			if ( self::$pb_class !== $node -> getAttribute( 'class' ) ) {
				continue;
			}

			$old_attributes = AMP_DOM_Utils::get_node_attributes_as_assoc_array( $node );

			$new_attributes = $this->filter_attributes( $old_attributes );

			if ( ! isset( $new_attributes['data-item'] ) && ! isset( $new_attributes['src'] ) ) {
				continue;
			}

			$new_node = AMP_DOM_Utils::create_node( $this->dom, self::$script_slug, $new_attributes );

			$node->parentNode->replaceChild( $new_node, $node );

			$this->did_convert_elements = true;

		}

	}


	private function filter_attributes( $attributes ) {
		$out = array();

		foreach ( $attributes as $name => $value ) {
			switch ( $name ) {
				case 'data-item':
					if ( ! empty( $value ) ) {
						$out['data-item'] = $value;
					}
				break;

				case 'data-game':
					if ( ! empty( $value ) ) {
						$out['src'] = $value;
					}
				break;

				case 'data-game-info':
					$out['data-item-info'] = $value;
				break;

				case 'data-shares':
					$out['data-share-buttons'] = $value;
				break;

				case 'data-comments':
					$out['data-comments'] = $value;
				break;

				default;
				break;
			}
		}

		$out['height'] = self::$height;

		return $out;
	}
}