<?php
/**
 * Notification Manager
 * 
 * Central manager for notification system. Works with WooCommerce emails
 * and provides hooks for addon channels (WhatsApp, Telegram, etc.)
 * 
 * @package WooNooW\Core\Notifications
 */

namespace WooNooW\Core\Notifications;

class NotificationManager {
	
	/**
	 * Registered notification channels
	 * 
	 * @var array
	 */
	private static $channels = [];
	
	/**
	 * Notification events registry
	 * 
	 * @var array
	 */
	private static $events = [];
	
	/**
	 * Initialize notification system
	 */
	public static function init() {
		// Register built-in email channel
		self::register_channel('email', [
			'id' => 'email',
			'label' => __('Email', 'woonoow'),
			'icon' => 'mail',
			'builtin' => true,
			'enabled' => true,
		]);
		
		// Register default notification events
		self::register_default_events();
		
		// Allow addons to register their channels
		add_action('woonoow_register_notification_channels', [__CLASS__, 'allow_addon_registration']);
	}
	
	/**
	 * Register a notification channel
	 * 
	 * @param string $id Channel ID
	 * @param array $args Channel arguments
	 */
	public static function register_channel($id, $args = []) {
		$defaults = [
			'id' => $id,
			'label' => ucfirst($id),
			'icon' => 'bell',
			'builtin' => false,
			'enabled' => false,
			'addon' => '',
		];
		
		self::$channels[$id] = wp_parse_args($args, $defaults);
	}
	
	/**
	 * Get all registered channels
	 * 
	 * @return array
	 */
	public static function get_channels() {
		return apply_filters('woonoow_notification_channels', self::$channels);
	}
	
	/**
	 * Register default notification events
	 */
	private static function register_default_events() {
		// Order events
		self::register_event('order_placed', [
			'label' => __('Order Placed', 'woonoow'),
			'description' => __('When a new order is placed', 'woonoow'),
			'category' => 'orders',
			'wc_email' => 'new_order', // Maps to WC_Email_New_Order
		]);
		
		self::register_event('order_processing', [
			'label' => __('Order Processing', 'woonoow'),
			'description' => __('When order status changes to processing', 'woonoow'),
			'category' => 'orders',
			'wc_email' => 'customer_processing_order',
		]);
		
		self::register_event('order_completed', [
			'label' => __('Order Completed', 'woonoow'),
			'description' => __('When order is marked as completed', 'woonoow'),
			'category' => 'orders',
			'wc_email' => 'customer_completed_order',
		]);
		
		self::register_event('order_cancelled', [
			'label' => __('Order Cancelled', 'woonoow'),
			'description' => __('When order is cancelled', 'woonoow'),
			'category' => 'orders',
			'wc_email' => 'cancelled_order',
		]);
		
		self::register_event('order_refunded', [
			'label' => __('Order Refunded', 'woonoow'),
			'description' => __('When order is refunded', 'woonoow'),
			'category' => 'orders',
			'wc_email' => 'customer_refunded_order',
		]);
		
		// Product events
		self::register_event('low_stock', [
			'label' => __('Low Stock Alert', 'woonoow'),
			'description' => __('When product stock is low', 'woonoow'),
			'category' => 'products',
			'wc_email' => 'low_stock',
		]);
		
		self::register_event('out_of_stock', [
			'label' => __('Out of Stock Alert', 'woonoow'),
			'description' => __('When product is out of stock', 'woonoow'),
			'category' => 'products',
			'wc_email' => 'no_stock',
		]);
		
		// Customer events
		self::register_event('new_customer', [
			'label' => __('New Customer', 'woonoow'),
			'description' => __('When a new customer registers', 'woonoow'),
			'category' => 'customers',
			'wc_email' => 'customer_new_account',
		]);
		
		self::register_event('customer_note', [
			'label' => __('Customer Note Added', 'woonoow'),
			'description' => __('When a note is added to customer order', 'woonoow'),
			'category' => 'customers',
			'wc_email' => 'customer_note',
		]);
	}
	
	/**
	 * Register a notification event
	 * 
	 * @param string $id Event ID
	 * @param array $args Event arguments
	 */
	public static function register_event($id, $args = []) {
		$defaults = [
			'id' => $id,
			'label' => ucfirst(str_replace('_', ' ', $id)),
			'description' => '',
			'category' => 'general',
			'wc_email' => '',
			'channels' => [],
		];
		
		self::$events[$id] = wp_parse_args($args, $defaults);
	}
	
	/**
	 * Get all registered events
	 * 
	 * @return array
	 */
	public static function get_events() {
		return apply_filters('woonoow_notification_events', self::$events);
	}
	
	/**
	 * Get events by category
	 * 
	 * @param string $category Category name
	 * @return array
	 */
	public static function get_events_by_category($category) {
		$events = self::get_events();
		return array_filter($events, function($event) use ($category) {
			return $event['category'] === $category;
		});
	}
	
	/**
	 * Send notification
	 * 
	 * @param string $event_id Event ID
	 * @param array $data Notification data
	 * @param array $channels Channels to use (default: from settings)
	 */
	public static function send($event_id, $data = [], $channels = null) {
		// Get event configuration
		$event = self::$events[$event_id] ?? null;
		if (!$event) {
			return;
		}
		
		// Get channels from settings if not specified
		if ($channels === null) {
			$settings = NotificationSettingsProvider::get_event_settings($event_id);
			$channels = $settings['channels'] ?? ['email'];
		}
		
		// Send via each enabled channel
		foreach ($channels as $channel_id) {
			// Email is handled by WooCommerce, skip it
			if ($channel_id === 'email') {
				continue;
			}
			
			// Fire action for addon channels
			do_action("woonoow_notification_send_{$channel_id}", $event_id, $data);
		}
	}
	
	/**
	 * Allow addons to register channels
	 */
	public static function allow_addon_registration() {
		// Addons hook into this to register their channels
		// Example: add_action('woonoow_register_notification_channels', function() {
		//     NotificationManager::register_channel('whatsapp', [...]);
		// });
	}
}