<?php
/**
 * Template catalog for the block picker, cached on the site.
 *
 * @package LayersDocEmbed
 */

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

add_action( 'rest_api_init', 'layers_doc_embed_rest_routes' );

/**
 * GET /wp-json/layers-doc-embed/v1/templates — editors only.
 */
function layers_doc_embed_rest_routes() {
	register_rest_route(
		'layers-doc-embed/v1',
		'/templates',
		array(
			'methods'             => 'GET',
			'callback'            => 'layers_doc_embed_rest_templates',
			'permission_callback' => function () {
				return current_user_can( 'edit_posts' );
			},
		)
	);
}

/**
 * Fetches the public catalog once per 12 hours.
 *
 * @return array|WP_Error
 */
function layers_doc_embed_catalog() {
	$cached = get_transient( 'layers_doc_embed_catalog' );
	if ( is_array( $cached ) ) {
		return $cached;
	}
	$response = wp_remote_get(
		LAYERS_DOC_EMBED_APP . '/v1/public/templates',
		array(
			'timeout' => 10,
			'headers' => array( 'Accept' => 'application/json' ),
		)
	);
	if ( is_wp_error( $response ) ) {
		return $response;
	}
	if ( 200 !== wp_remote_retrieve_response_code( $response ) ) {
		return new WP_Error( 'layers_doc_embed_catalog', __( 'The Layers template catalog is not reachable right now.', 'layers-doc-embed' ) );
	}
	$body = json_decode( wp_remote_retrieve_body( $response ), true );
	$list = array();
	if ( is_array( $body ) && isset( $body['templates'] ) && is_array( $body['templates'] ) ) {
		foreach ( $body['templates'] as $t ) {
			$slug = layers_doc_embed_clean_slug( isset( $t['slug'] ) ? $t['slug'] : '' );
			if ( '' === $slug ) {
				continue;
			}
			$list[] = array(
				'slug'    => $slug,
				'title'   => isset( $t['title'] ) ? sanitize_text_field( $t['title'] ) : $slug,
				'kind'    => isset( $t['kind'] ) ? sanitize_key( $t['kind'] ) : '',
				'lang'    => isset( $t['lang'] ) ? sanitize_key( $t['lang'] ) : '',
				'hasPage' => isset( $t['formats'] ) && is_array( $t['formats'] ) && in_array( 'page', $t['formats'], true ),
			);
		}
	}
	set_transient( 'layers_doc_embed_catalog', $list, 12 * HOUR_IN_SECONDS );
	return $list;
}

/**
 * REST callback.
 *
 * @return WP_REST_Response|WP_Error
 */
function layers_doc_embed_rest_templates() {
	$list = layers_doc_embed_catalog();
	if ( is_wp_error( $list ) ) {
		return $list;
	}
	return rest_ensure_response(
		array(
			'templates' => $list,
			'lang'      => layers_doc_embed_options()['lang'],
		)
	);
}