<?php
/**
 * Settings endpoint.
 *
 * @package SpaceBay
 */

namespace SpaceBay\Rest;

use SpaceBay\Core\Settings;
use WP_REST_Request;
use WP_REST_Response;
use WP_REST_Server;

defined( 'ABSPATH' ) || exit;

/**
 * Reads and saves SpaceBay settings. Administrators only.
 */
final class SettingsController extends Controller {

	/**
	 * Registers the /settings route.
	 *
	 * @return void
	 */
	public function register_routes() {
		register_rest_route(
			$this->namespace,
			'/settings',
			array(
				array(
					'methods'             => WP_REST_Server::READABLE,
					'callback'            => array( $this, 'get_items' ),
					'permission_callback' => array( $this, 'permission_manage' ),
				),
				array(
					'methods'             => WP_REST_Server::EDITABLE,
					'callback'            => array( $this, 'update_items' ),
					'permission_callback' => array( $this, 'permission_manage' ),
					'args'                => $this->get_update_args(),
				),
			)
		);
	}

	/**
	 * Returns every setting.
	 *
	 * @param WP_REST_Request $request Request object.
	 * @return WP_REST_Response
	 */
	public function get_items( $request ) {
		unset( $request );

		return rest_ensure_response( $this->prepare( Settings::all() ) );
	}

	/**
	 * Saves the settings present in the request body.
	 *
	 * @param WP_REST_Request $request Request object.
	 * @return WP_REST_Response
	 */
	public function update_items( $request ) {
		$input = array();

		foreach ( array_keys( Settings::schema() ) as $key ) {
			if ( $request->has_param( $key ) ) {
				$input[ $key ] = $request->get_param( $key );
			}
		}

		return rest_ensure_response( $this->prepare( Settings::update( $input ) ) );
	}

	/**
	 * Lets add-ons add what the settings screen needs on top of the stored values.
	 *
	 * @param array $settings Stored settings.
	 * @return array
	 */
	private function prepare( array $settings ) {
		/**
		 * Filters the settings sent to the settings screen.
		 *
		 * @since 1.0.0
		 *
		 * @param array $settings Stored settings.
		 */
		return apply_filters( 'spacebay_settings_response', $settings );
	}

	/**
	 * Builds REST argument definitions from the settings schema.
	 *
	 * @return array
	 */
	private function get_update_args() {
		$args = array();

		foreach ( Settings::schema() as $key => $field ) {
			$arg = array(
				'required' => false,
				'type'     => 'string',
			);

			if ( 'bool' === $field['type'] ) {
				$arg['type'] = 'boolean';
			} elseif ( 'int' === $field['type'] ) {
				$arg['type']    = 'integer';
				$arg['minimum'] = $field['min'];
				$arg['maximum'] = $field['max'];
			} elseif ( 'enum' === $field['type'] ) {
				$arg['enum'] = $field['options'];
			} elseif ( 'image' === $field['type'] ) {
				$arg['type']    = 'integer';
				$arg['minimum'] = 0;
			} elseif ( 'array' === $field['type'] || in_array( $field['type'], array( 'levels', 'badges' ), true ) ) {
				$arg['type']     = 'array';
				$arg['maxItems'] = 60;
				$arg['items']    = array( 'type' => 'object' );
			} elseif ( 'color' === $field['type'] ) {
				$arg['pattern'] = '^#([A-Fa-f0-9]{3}){1,2}$';
			}

			$args[ $key ] = $arg;
		}

		return $args;
	}
}