<?php

/**

 * Utilities used to fetch and create templates.

 *

 * @package WordPress

 * @since 5.8.0

 */

/**

 * Build a unified template object based a post Object.

 *

 * @access private

 * @since 5.8.0

 *

 * @param WP_Post $post Template post.

 *

 * @return WP_Block_Template|WP_Error Template.

 */

function _build_template_result_from_post( $post ) {

	$terms = get_the_terms( $post, 'wp_theme' );

	if ( is_wp_error( $terms ) ) {

		return $terms;

	}

	if ( ! $terms ) {

		return new WP_Error( 'template_missing_theme', __( 'No theme is defined for this template.' ) );

	}

	$theme = $terms[0]->name;

	$template                 = new WP_Block_Template();

	$template->wp_id          = $post->ID;

	$template->id             = $theme . '//' . $post->post_name;

	$template->theme          = $theme;

	$template->content        = $post->post_content;

	$template->slug           = $post->post_name;

	$template->source         = 'custom';

	$template->type           = $post->post_type;

	$template->description    = $post->post_excerpt;

	$template->title          = $post->post_title;

	$template->status         = $post->post_status;

	$template->has_theme_file = false;

	return $template;

}

/**

 * Retrieves a list of unified template objects based on a query.

 *

 * @since 5.8.0

 *

 * @param array $query {

 *     Optional. Arguments to retrieve templates.

 *

 *     @type array  $slug__in List of slugs to include.

 *     @type int    $wp_id Post ID of customized template.

 * }

 * @param string $template_type Optional. The template type (post type). Default 'wp_template'.

 * @return WP_Block_Template[] Block template objects.

 */

function get_block_templates( $query = array(), $template_type = 'wp_template' ) {

	$wp_query_args = array(

		'post_status'    => array( 'auto-draft', 'draft', 'publish' ),

		'post_type'      => $template_type,

		'posts_per_page' => -1,

		'no_found_rows'  => true,

		'tax_query'      => array(

			array(

				'taxonomy' => 'wp_theme',

				'field'    => 'name',

				'terms'    => wp_get_theme()->get_stylesheet(),

			),

		),

	);

	if ( isset( $query['slug__in'] ) ) {

		$wp_query_args['post_name__in'] = $query['slug__in'];

	}

	// This is only needed for the regular templates CPT listing and editor.

	if ( isset( $query['wp_id'] ) ) {

		$wp_query_args['p'] = $query['wp_id'];

	} else {

		$wp_query_args['post_status'] = 'publish';

	}

	$template_query = new WP_Query( $wp_query_args );

	$query_result   = array();

	foreach ( $template_query->posts as $post ) {

		$template = _build_template_result_from_post( $post );

		if ( ! is_wp_error( $template ) ) {

			$query_result[] = $template;

		}

	}

	return $query_result;

}

/**

 * Retrieves a single unified template object using its id.

 *

 * @since 5.8.0

 *

 * @param string $id Template unique identifier (example: theme_slug//template_slug).

 * @param string $template_type wp_template.

 *

 * @return WP_Block_Template|null Template.

 */

function get_block_template( $id, $template_type = 'wp_template' ) {

	$parts = explode( '//', $id, 2 );

	if ( count( $parts ) < 2 ) {

		return null;

	}

	list( $theme, $slug ) = $parts;

	$wp_query_args        = array(

		'post_name__in'  => array( $slug ),

		'post_type'      => $template_type,

		'post_status'    => array( 'auto-draft', 'draft', 'publish', 'trash' ),

		'posts_per_page' => 1,

		'no_found_rows'  => true,

		'tax_query'      => array(

			array(

				'taxonomy' => 'wp_theme',

				'field'    => 'name',

				'terms'    => $theme,

			),

		),

	);

	$template_query       = new WP_Query( $wp_query_args );

	$posts                = $template_query->posts;

	if ( count( $posts ) > 0 ) {

		$template = _build_template_result_from_post( $posts[0] );

		if ( ! is_wp_error( $template ) ) {

			return $template;

		}

	}

	return null;

}