<?php
/**
 * GET/PUT cortex/v1/config.
 *
 * @package CortexCommerce
 */

namespace CortexCommerce\Rest;

use CortexCommerce\Seo\SeoAdapters;
use CortexCommerce\Settings\Config;
use CortexCommerce\Settings\Options;

defined( 'ABSPATH' ) || exit;

/**
 * Pushed config: pixel on/off and the injection flags the Visibility scanner sets (spec §4.4, §4.5).
 */
final class ConfigController {

	public function register_routes(): void {
		register_rest_route(
			RestModule::NAMESPACE,
			'/config',
			array(
				array(
					'methods'             => 'GET',
					'callback'            => array( $this, 'get' ),
					'permission_callback' => array( RestModule::class, 'require_manage_woocommerce' ),
				),
				array(
					'methods'             => 'PUT',
					'callback'            => array( $this, 'put' ),
					'permission_callback' => array( RestModule::class, 'require_manage_woocommerce' ),
				),
			)
		);
	}

	public function get(): \WP_REST_Response {
		return new \WP_REST_Response( self::payload() );
	}

	/**
	 * @return \WP_REST_Response|\WP_Error
	 */
	public function put( \WP_REST_Request $request ) {
		$patch = $request->get_json_params();
		$error = self::validate( $patch );
		if ( null !== $error ) {
			return $error;
		}
		$patch = (array) $patch;
		if ( array_key_exists( 'pixel_id', $patch ) ) {
			Options::set_pixel_id( (string) $patch['pixel_id'] );
			unset( $patch['pixel_id'] );
		}
		if ( array() !== $patch ) {
			Options::update_settings( $patch );
		}
		return new \WP_REST_Response( self::payload() );
	}

	/**
	 * Booleans only, known keys only. Anything else is a 400 and nothing is written.
	 *
	 * @param mixed $patch Decoded JSON body.
	 */
	public static function validate( $patch ): ?\WP_Error {
		if ( ! is_array( $patch ) || array() === $patch ) {
			return self::invalid( __( 'Send a JSON object with pixel_enabled, injection and/or pixel_id.', 'cortexcommerce' ) );
		}
		foreach ( $patch as $key => $value ) {
			if ( 'pixel_enabled' === $key ) {
				if ( ! is_bool( $value ) ) {
					return self::invalid( __( 'pixel_enabled must be true or false.', 'cortexcommerce' ) );
				}
				continue;
			}
			if ( 'injection' === $key ) {
				if ( ! is_array( $value ) || array() === $value ) {
					return self::invalid( __( 'injection must be an object of flags.', 'cortexcommerce' ) );
				}
				foreach ( $value as $flag => $on ) {
					if ( ! in_array( $flag, Options::INJECTION_KEYS, true ) || ! is_bool( $on ) ) {
						/* translators: %s: the flag name. */
						return self::invalid( sprintf( __( 'Unknown or non-boolean injection flag: %s', 'cortexcommerce' ), (string) $flag ) );
					}
				}
				continue;
			}
			if ( 'pixel_id' === $key ) {
				if ( ! is_string( $value ) || 1 !== preg_match( Options::PIXEL_ID_PATTERN, $value ) ) {
					return self::invalid( __( 'pixel_id must be 12 letters and digits.', 'cortexcommerce' ) );
				}
				continue;
			}
			/* translators: %s: the key name. */
			return self::invalid( sprintf( __( 'Unknown config key: %s', 'cortexcommerce' ), (string) $key ) );
		}
		return null;
	}

	/**
	 * @return array<string, mixed>
	 */
	public static function payload(): array {
		$settings = Options::settings();
		return array(
			'tenant_id'     => Options::tenant_id(),
			'pixel_id'      => Options::pixel_id(),
			'store_host'    => Config::store_host(),
			'pixel_enabled' => $settings['pixel_enabled'],
			'injection'     => $settings['injection'],
			'seo_plugin'    => SeoAdapters::detect()->id(),
			// Since 1.1.0 the plugin pushes product changes itself (contract §5c) instead of WooCommerce webhooks.
			'webhooks'      => 'push',
			'versions'      => array(
				'plugin' => Config::VERSION,
				'wp'     => (string) get_bloginfo( 'version' ),
				'wc'     => defined( 'WC_VERSION' ) ? (string) WC_VERSION : '',
				'php'    => PHP_VERSION,
			),
		);
	}

	private static function invalid( string $message ): \WP_Error {
		return new \WP_Error( 'cortexcommerce_invalid_config', $message, array( 'status' => 400 ) );
	}
}