<?php
/**
 * Notifications REST API Controller
 * 
 * Bridge to WooCommerce emails + addon channel framework.
 * 
 * @package WooNooW\Api
 */

namespace WooNooW\Api;

use WP_REST_Request;
use WP_REST_Response;
use WP_Error;
use WooNooW\Core\Notifications\TemplateProvider;
use WooNooW\Core\Notifications\PushNotificationHandler;

class NotificationsController {
	
	/**
	 * REST API namespace
	 */
	private $namespace = 'woonoow/v1';
	
	/**
	 * REST API base
	 */
	private $rest_base = 'notifications';
	
	/**
	 * Register routes
	 */
	public function register_routes() {
		// GET /woonoow/v1/notifications/channels
		register_rest_route($this->namespace, '/' . $this->rest_base . '/channels', [
			[
				'methods' => 'GET',
				'callback' => [$this, 'get_channels'],
				'permission_callback' => [$this, 'check_permission'],
			],
		]);
		
		// GET /woonoow/v1/notifications/events
		register_rest_route($this->namespace, '/' . $this->rest_base . '/events', [
			[
				'methods' => 'GET',
				'callback' => [$this, 'get_events'],
				'permission_callback' => [$this, 'check_permission'],
			],
		]);
		
		// POST /woonoow/v1/notifications/events/update
		register_rest_route($this->namespace, '/' . $this->rest_base . '/events/update', [
			[
				'methods' => 'POST',
				'callback' => [$this, 'update_event'],
				'permission_callback' => [$this, 'check_permission'],
			],
		]);
		
		// GET /woonoow/v1/notifications/templates
		register_rest_route($this->namespace, '/' . $this->rest_base . '/templates', [
			[
				'methods' => 'GET',
				'callback' => [$this, 'get_templates'],
				'permission_callback' => [$this, 'check_permission'],
			],
		]);
		
		// GET /woonoow/v1/notifications/templates/:eventId/:channelId
		register_rest_route($this->namespace, '/' . $this->rest_base . '/templates/(?P<eventId>[a-zA-Z0-9_-]+)/(?P<channelId>[a-zA-Z0-9_-]+)', [
			[
				'methods' => 'GET',
				'callback' => [$this, 'get_template'],
				'permission_callback' => [$this, 'check_permission'],
			],
		]);
		
		// POST /woonoow/v1/notifications/templates
		register_rest_route($this->namespace, '/' . $this->rest_base . '/templates', [
			[
				'methods' => 'POST',
				'callback' => [$this, 'save_template'],
				'permission_callback' => [$this, 'check_permission'],
			],
		]);
		
		// DELETE /woonoow/v1/notifications/templates/:eventId/:channelId
		register_rest_route($this->namespace, '/' . $this->rest_base . '/templates/(?P<eventId>[a-zA-Z0-9_-]+)/(?P<channelId>[a-zA-Z0-9_-]+)', [
			[
				'methods' => 'DELETE',
				'callback' => [$this, 'delete_template'],
				'permission_callback' => [$this, 'check_permission'],
			],
		]);
		
		// GET /woonoow/v1/notifications/push/vapid-key
		register_rest_route($this->namespace, '/' . $this->rest_base . '/push/vapid-key', [
			[
				'methods' => 'GET',
				'callback' => [$this, 'get_vapid_key'],
				'permission_callback' => '__return_true',
			],
		]);
		
		// POST /woonoow/v1/notifications/push/subscribe
		register_rest_route($this->namespace, '/' . $this->rest_base . '/push/subscribe', [
			[
				'methods' => 'POST',
				'callback' => [$this, 'push_subscribe'],
				'permission_callback' => '__return_true',
			],
		]);
		
		// POST /woonoow/v1/notifications/push/unsubscribe
		register_rest_route($this->namespace, '/' . $this->rest_base . '/push/unsubscribe', [
			[
				'methods' => 'POST',
				'callback' => [$this, 'push_unsubscribe'],
				'permission_callback' => '__return_true',
			],
		]);
	}
	
	/**
	 * Get available notification channels
	 * 
	 * @param WP_REST_Request $request Request object
	 * @return WP_REST_Response
	 */
	public function get_channels(WP_REST_Request $request) {
		$channels = [
			[
				'id' => 'email',
				'label' => __('Email', 'woonoow'),
				'icon' => 'mail',
				'enabled' => true,
				'builtin' => true,
			],
			[
				'id' => 'push',
				'label' => __('Push Notifications', 'woonoow'),
				'icon' => 'bell',
				'enabled' => true,
				'builtin' => true,
			],
		];
		
		// Allow addons to register their channels
		$channels = apply_filters('woonoow_notification_channels', $channels);
		
		return new WP_REST_Response($channels, 200);
	}
	
	/**
	 * Get notification events
	 * 
	 * @param WP_REST_Request $request Request object
	 * @return WP_REST_Response
	 */
	public function get_events(WP_REST_Request $request) {
		// Get saved settings
		$settings = get_option('woonoow_notification_settings', []);
		
		// Define default events (maps to WooCommerce emails)
		$events = [
			'orders' => [
				[
					'id' => 'order_placed',
					'label' => __('Order Placed', 'woonoow'),
					'description' => __('When a new order is placed', 'woonoow'),
					'category' => 'orders',
					'wc_email' => 'new_order',
					'enabled' => true,
					'channels' => $settings['order_placed'] ?? ['email' => ['enabled' => true, 'recipient' => 'admin']],
				],
				[
					'id' => 'order_processing',
					'label' => __('Order Processing', 'woonoow'),
					'description' => __('When order status changes to processing', 'woonoow'),
					'category' => 'orders',
					'wc_email' => 'customer_processing_order',
					'enabled' => true,
					'channels' => $settings['order_processing'] ?? ['email' => ['enabled' => true, 'recipient' => 'customer']],
				],
				[
					'id' => 'order_completed',
					'label' => __('Order Completed', 'woonoow'),
					'description' => __('When order is marked as completed', 'woonoow'),
					'category' => 'orders',
					'wc_email' => 'customer_completed_order',
					'enabled' => true,
					'channels' => $settings['order_completed'] ?? ['email' => ['enabled' => true, 'recipient' => 'customer']],
				],
				[
					'id' => 'order_cancelled',
					'label' => __('Order Cancelled', 'woonoow'),
					'description' => __('When order is cancelled', 'woonoow'),
					'category' => 'orders',
					'wc_email' => 'cancelled_order',
					'enabled' => true,
					'channels' => $settings['order_cancelled'] ?? ['email' => ['enabled' => true, 'recipient' => 'admin']],
				],
				[
					'id' => 'order_refunded',
					'label' => __('Order Refunded', 'woonoow'),
					'description' => __('When order is refunded', 'woonoow'),
					'category' => 'orders',
					'wc_email' => 'customer_refunded_order',
					'enabled' => true,
					'channels' => $settings['order_refunded'] ?? ['email' => ['enabled' => true, 'recipient' => 'customer']],
				],
			],
			'products' => [
				[
					'id' => 'low_stock',
					'label' => __('Low Stock Alert', 'woonoow'),
					'description' => __('When product stock is low', 'woonoow'),
					'category' => 'products',
					'wc_email' => 'low_stock',
					'enabled' => true,
					'channels' => $settings['low_stock'] ?? ['email' => ['enabled' => true, 'recipient' => 'admin']],
				],
				[
					'id' => 'out_of_stock',
					'label' => __('Out of Stock Alert', 'woonoow'),
					'description' => __('When product is out of stock', 'woonoow'),
					'category' => 'products',
					'wc_email' => 'no_stock',
					'enabled' => true,
					'channels' => $settings['out_of_stock'] ?? ['email' => ['enabled' => true, 'recipient' => 'admin']],
				],
			],
			'customers' => [
				[
					'id' => 'new_customer',
					'label' => __('New Customer', 'woonoow'),
					'description' => __('When a new customer registers', 'woonoow'),
					'category' => 'customers',
					'wc_email' => 'customer_new_account',
					'enabled' => true,
					'channels' => $settings['new_customer'] ?? ['email' => ['enabled' => true, 'recipient' => 'customer']],
				],
				[
					'id' => 'customer_note',
					'label' => __('Customer Note Added', 'woonoow'),
					'description' => __('When a note is added to customer order', 'woonoow'),
					'category' => 'customers',
					'wc_email' => 'customer_note',
					'enabled' => true,
					'channels' => $settings['customer_note'] ?? ['email' => ['enabled' => true, 'recipient' => 'customer']],
				],
			],
		];
		
		// Allow addons to add custom events
		$events = apply_filters('woonoow_notification_events', $events);
		
		return new WP_REST_Response($events, 200);
	}
	
	/**
	 * Update event settings
	 * 
	 * @param WP_REST_Request $request Request object
	 * @return WP_REST_Response|WP_Error
	 */
	public function update_event(WP_REST_Request $request) {
		$event_id = $request->get_param('eventId');
		$channel_id = $request->get_param('channelId');
		$enabled = $request->get_param('enabled');
		$recipient = $request->get_param('recipient');
		
		if (empty($event_id) || empty($channel_id)) {
			return new WP_Error(
				'invalid_params',
				__('Event ID and Channel ID are required', 'woonoow'),
				['status' => 400]
			);
		}
		
		// Get current settings
		$settings = get_option('woonoow_notification_settings', []);
		
		// Update settings
		if (!isset($settings[$event_id])) {
			$settings[$event_id] = [];
		}
		
		$settings[$event_id][$channel_id] = [
			'enabled' => $enabled,
			'recipient' => $recipient ?? 'admin',
		];
		
		// Save settings
		update_option('woonoow_notification_settings', $settings);
		
		// Fire action for addons to react
		do_action('woonoow_notification_event_updated', $event_id, $channel_id, $enabled, $recipient);
		
		return new WP_REST_Response([
			'success' => true,
			'message' => __('Event settings updated successfully', 'woonoow'),
		], 200);
	}
	
	/**
	 * Check if user has permission
	 * 
	 * @return bool
	 */
	public function check_permission() {
		return current_user_can('manage_woocommerce') || current_user_can('manage_options');
	}
	
	/**
	 * Get all templates
	 * 
	 * @param WP_REST_Request $request Request object
	 * @return WP_REST_Response
	 */
	public function get_templates(WP_REST_Request $request) {
		$templates = TemplateProvider::get_templates();
		return new WP_REST_Response($templates, 200);
	}
	
	/**
	 * Get single template
	 * 
	 * @param WP_REST_Request $request Request object
	 * @return WP_REST_Response|WP_Error
	 */
	public function get_template(WP_REST_Request $request) {
		$event_id = $request->get_param('eventId');
		$channel_id = $request->get_param('channelId');
		
		$template = TemplateProvider::get_template($event_id, $channel_id);
		
		if (!$template) {
			return new WP_Error(
				'template_not_found',
				__('Template not found', 'woonoow'),
				['status' => 404]
			);
		}
		
		return new WP_REST_Response($template, 200);
	}
	
	/**
	 * Save template
	 * 
	 * @param WP_REST_Request $request Request object
	 * @return WP_REST_Response|WP_Error
	 */
	public function save_template(WP_REST_Request $request) {
		$event_id = $request->get_param('eventId');
		$channel_id = $request->get_param('channelId');
		$subject = $request->get_param('subject');
		$body = $request->get_param('body');
		
		if (empty($event_id) || empty($channel_id)) {
			return new WP_Error(
				'invalid_params',
				__('Event ID and Channel ID are required', 'woonoow'),
				['status' => 400]
			);
		}
		
		$success = TemplateProvider::save_template($event_id, $channel_id, [
			'subject' => $subject,
			'body' => $body,
		]);
		
		if (!$success) {
			return new WP_Error(
				'save_failed',
				__('Failed to save template', 'woonoow'),
				['status' => 500]
			);
		}
		
		return new WP_REST_Response([
			'success' => true,
			'message' => __('Template saved successfully', 'woonoow'),
		], 200);
	}
	
	/**
	 * Delete template (revert to default)
	 * 
	 * @param WP_REST_Request $request Request object
	 * @return WP_REST_Response
	 */
	public function delete_template(WP_REST_Request $request) {
		$event_id = $request->get_param('eventId');
		$channel_id = $request->get_param('channelId');
		
		TemplateProvider::delete_template($event_id, $channel_id);
		
		return new WP_REST_Response([
			'success' => true,
			'message' => __('Template reverted to default', 'woonoow'),
		], 200);
	}
	
	/**
	 * Get VAPID public key for push notifications
	 * 
	 * @param WP_REST_Request $request Request object
	 * @return WP_REST_Response
	 */
	public function get_vapid_key(WP_REST_Request $request) {
		$public_key = PushNotificationHandler::get_public_key();
		
		return new WP_REST_Response([
			'publicKey' => $public_key,
		], 200);
	}
	
	/**
	 * Subscribe to push notifications
	 * 
	 * @param WP_REST_Request $request Request object
	 * @return WP_REST_Response|WP_Error
	 */
	public function push_subscribe(WP_REST_Request $request) {
		$subscription = $request->get_param('subscription');
		$user_id = get_current_user_id();
		
		if (empty($subscription)) {
			return new WP_Error(
				'invalid_subscription',
				__('Subscription data is required', 'woonoow'),
				['status' => 400]
			);
		}
		
		$success = PushNotificationHandler::subscribe($subscription, $user_id);
		
		if (!$success) {
			return new WP_Error(
				'subscribe_failed',
				__('Failed to subscribe to push notifications', 'woonoow'),
				['status' => 500]
			);
		}
		
		return new WP_REST_Response([
			'success' => true,
			'message' => __('Subscribed to push notifications', 'woonoow'),
		], 200);
	}
	
	/**
	 * Unsubscribe from push notifications
	 * 
	 * @param WP_REST_Request $request Request object
	 * @return WP_REST_Response
	 */
	public function push_unsubscribe(WP_REST_Request $request) {
		$subscription_id = $request->get_param('subscriptionId');
		
		PushNotificationHandler::unsubscribe($subscription_id);
		
		return new WP_REST_Response([
			'success' => true,
			'message' => __('Unsubscribed from push notifications', 'woonoow'),
		], 200);
	}
}