<?php
/**
 * CSS and JavaScript optimization REST endpoints.
 *
 * @package NBHPerformance
 */

namespace NBH\Performance\Modules\CssJsOptimization;

use NBH\Performance\Modules\Core\Module;
use WP_Error;
use WP_REST_Request;
use WP_REST_Server;

/**
 * Exposes asset optimization status and maintenance operations.
 */
final class OptimizationController implements Module {

	/** @var AssetOptimizer */
	private $optimizer;

	/** @var AssetBundleCompiler */
	private $bundles;

	/** @var AssetHealthMonitor */
	private $health;

	/**
	 * Set module dependencies.
	 *
	 * @param AssetOptimizer       $optimizer Asset optimizer.
	 * @param AssetBundleCompiler $bundles   Bundle compiler.
	 * @param AssetHealthMonitor  $health    Asset health monitor.
	 */
	public function __construct( AssetOptimizer $optimizer, AssetBundleCompiler $bundles, AssetHealthMonitor $health ) {
		$this->optimizer = $optimizer;
		$this->bundles   = $bundles;
		$this->health    = $health;
	}

	/** Register REST routes on the correct WordPress hook. */
	public function register() {
		add_action( 'rest_api_init', array( $this, 'routes' ) );
	}

	/** Register endpoints for optimizer status and manual recovery. */
	public function routes() {
		$routes = array(
			'/optimization/status'        => array( WP_REST_Server::READABLE, 'status' ),
			'/optimization/assets/flush' => array( WP_REST_Server::CREATABLE, 'flush_assets' ),
			'/optimization/health/resume' => array( WP_REST_Server::CREATABLE, 'resume_health' ),
		);

		foreach ( $routes as $path => $config ) {
			nbh_performance_register_rest_route(
				'nbh-performance/v1',
				$path,
				array(
					'methods'             => $config[0],
					'callback'            => array( $this, $config[1] ),
					'permission_callback' => array( $this, 'permission' ),
				)
			);
		}
	}

	/**
	 * Ensure the current REST request is authorized.
	 *
	 * @param WP_REST_Request $request The REST request.
	 * @return bool|WP_Error
	 */
	public function permission( WP_REST_Request $request ) {
		if ( ! current_user_can( 'manage_options' ) ) {
			return new WP_Error(
				'nbh_performance_forbidden',
				__( 'You cannot manage CSS and JavaScript optimization.', 'nbh-performance' ),
				array( 'status' => 403 )
			);
		}

		return \NBH\Performance\Modules\Security\NonceGuard::verify_rest( $request );
	}

	/**
	 * Return the active optimization settings.
	 *
	 * @return \WP_REST_Response
	 */
	public function status() {
		$safe  = (bool) get_option( 'nbh_performance_safe_mode', 1 );
		$flags = array(
			'css_minify'     => 'nbh_performance_css_minify_enabled',
			'js_minify'      => 'nbh_performance_js_minify_enabled',
			'combine_assets' => 'nbh_performance_combine_assets_enabled',
			'defer_js'       => 'nbh_performance_defer_js_enabled',
			'delay_js'       => 'nbh_performance_delay_js_enabled',
		);
		$data  = array(
			'safe_mode'      => $safe,
			'script_manager' => (bool) get_option( 'nbh_performance_script_manager_enabled', 0 ),
			'delay_timeout'  => absint( get_option( 'nbh_performance_delay_timeout', 5000 ) ),
			'assets'         => $this->optimizer->status(),
		);
		$active = 0;

		foreach ( $flags as $label => $setting ) {
			$on             = (bool) get_option( $setting, 0 );
			$active        += (int) $on;
			$data[ $label ] = $on && ! $safe;
		}

		$data['active_features'] = $active;
		$data['runtime_ready']   = ! $safe && $active > 0 && empty( $data['assets']['emergency_rollback'] );

		return rest_ensure_response( $data );
	}

	/**
	 * Flush optimized assets and their manifests.
	 *
	 * @return \WP_REST_Response
	 */
	public function flush_assets() {
		$result                 = $this->optimizer->flush_cache();
		$this->bundles->flush_manifests();
		$result['optimization'] = $this->status()->get_data();

		return rest_ensure_response( $result );
	}

	/**
	 * Resume optimization after a safety rollback.
	 *
	 * @return \WP_REST_Response
	 */
	public function resume_health() {
		$result                 = $this->health->clear_and_resume();
		$result['optimization'] = $this->status()->get_data();

		return rest_ensure_response( $result );
	}
}