<?php


abstract class ET_Builder_Module_Type_PostBased extends ET_Builder_Module {

	public $is_post_based = true;

	/**
	 * Loads and returns the contents of the "No Results" template.
	 *
	 * @since 3.0.77
	 *
	 * @return string
	 */
	public static function get_no_results_template() {
		ob_start();

		if ( et_is_builder_plugin_active() ) {
			include( ET_BUILDER_PLUGIN_DIR . 'includes/no-results.php' );
		} else {
			get_template_part( 'includes/no-results', 'index' );
		}

		return ob_get_clean();
	}

	/**
	 * Filters out invalid term ids from an array.
	 *
	 * @since 3.0.106
	 *
	 * @param integer[] $term_ids
	 * @param string $taxonomy
	 *
	 * @return integer[]
	 */
	public static function filter_invalid_term_ids( $term_ids, $taxonomy ) {
		$valid_term_ids = array();

		foreach ( $term_ids as $term_id ) {
			$term_id = intval( $term_id );
			$term = term_exists( $term_id, $taxonomy );
			if ( ! empty( $term ) ) {
				$valid_term_ids[] = $term_id;
			}
		}

		return $valid_term_ids;
	}

	/**
	 * Convert an array or comma-separated list of term ids and special keywords to an array of term ids.
	 *
	 * @since ??
	 *
	 * @param string|array $terms Comma-separated list of term ids and special keywords.
	 * @param integer $post_id Optional post id to resolve "current" categories.
	 * @param string $taxonomy
	 *
	 * @return array<integer>
	 */
	protected static function filter_meta_categories( $categories, $post_id = 0, $taxonomy = 'category' ) {
		$raw_term_ids = is_array( $categories ) ? $categories : explode( ',', $categories );

		if ( in_array( 'all', $raw_term_ids, true ) ) {
			// If "All Categories" is selected return an empty array so it works for all terms
			// even ones created after the module was last updated.
			return array();
		}

		$term_ids = array();

		foreach ( $raw_term_ids as $value ) {
			if ( 'current' === $value ) {
				if ( $post_id > 0 ) {
					$post_terms = wp_get_object_terms( $post_id, $taxonomy );

					if ( is_wp_error( $post_terms ) ) {
						continue;
					}

					$term_ids = array_merge( $term_ids, wp_list_pluck( $post_terms, 'term_id' ) );
				}

				continue;
			}
			$term_ids[] = (int) $value;
		}

		$term_ids = self::filter_invalid_term_ids( array_unique( array_filter( $term_ids ) ), $taxonomy );

		return $term_ids;
	}
}
