<?php
/**
 * Event Registry - Single Source of Truth for Notification Events
 * 
 * Defines all notification events in the system with their metadata.
 * Other components query this registry instead of hardcoding event lists.
 * 
 * @package WooNooW\Core\Notifications
 */

namespace WooNooW\Core\Notifications;

class EventRegistry {
	
	/**
	 * Get all registered notification events
	 * 
	 * This is the SINGLE SOURCE OF TRUTH for all events in the system.
	 * All other components (API, TemplateProvider, etc.) must use this.
	 * 
	 * @return array Event definitions with structure:
	 *   [
	 *     'event_id' => [
	 *       'id' => 'event_id',
	 *       'label' => 'Human readable label',
	 *       'description' => 'What triggers this event',
	 *       'category' => 'orders|products|customers',
	 *       'recipient_type' => 'staff|customer',
	 *       'wc_email' => 'woocommerce_email_id',
	 *       'enabled' => true|false,
	 *     ]
	 *   ]
	 */
	public static function get_all_events() {
    $events = [
        // ===== CUSTOMER ACCOUNT EVENTS =====
        'new_customer' => [
            'id' => 'new_customer',
            'label' => __('New Customer', 'woonoow'),
            'description' => __('When a new customer registers', 'woonoow'),
            'category' => 'customers',
            'recipient_type' => 'customer',
            'wc_email' => 'customer_new_account',
            'enabled' => true,
        ],
        'password_reset' => [
            'id' => 'password_reset',
            'label' => __('Password Reset', 'woonoow'),
            'description' => __('When a customer requests a password reset', 'woonoow'),
            'category' => 'customers',
            'recipient_type' => 'customer',
            'wc_email' => '',
            'enabled' => true,
            'variables' => [
                '{reset_link}' => __('Password reset link', 'woonoow'),
                '{reset_key}' => __('Password reset key', 'woonoow'),
                '{user_login}' => __('Username', 'woonoow'),
                '{user_email}' => __('User email', 'woonoow'),
                '{site_name}' => __('Site name', 'woonoow'),
            ],
        ],
        
        // ===== NEWSLETTER EVENTS =====
        'newsletter_welcome' => [
            'id' => 'newsletter_welcome',
            'label' => __('Newsletter Welcome', 'woonoow'),
            'description' => __('Welcome email sent when someone subscribes to newsletter', 'woonoow'),
            'category' => 'marketing',
            'recipient_type' => 'customer',
            'wc_email' => '',
            'enabled' => true,
        ],
        'newsletter_subscribed_admin' => [
            'id' => 'newsletter_subscribed_admin',
            'label' => __('New Newsletter Subscriber', 'woonoow'),
            'description' => __('Admin notification when someone subscribes to newsletter', 'woonoow'),
            'category' => 'marketing',
            'recipient_type' => 'staff',
            'wc_email' => '',
            'enabled' => true,
        ],
        'newsletter_campaign' => [
            'id' => 'newsletter_campaign',
            'label' => __('Newsletter Campaign', 'woonoow'),
            'description' => __('Master email design template for newsletter campaigns', 'woonoow'),
            'category' => 'marketing',
            'recipient_type' => 'customer',
            'wc_email' => '',
            'enabled' => true,
            'variables' => [
                '{content}' => __('Campaign content', 'woonoow'),
                '{campaign_title}' => __('Campaign title', 'woonoow'),
                '{subscriber_email}' => __('Subscriber email', 'woonoow'),
                '{unsubscribe_url}' => __('Unsubscribe link', 'woonoow'),
            ],
        ],

        // ===== ORDER INITIATION =====
        'order_placed' => [
            'id' => 'order_placed',
            'label' => __('Order Placed', 'woonoow'),
            'description' => __('When a new order is placed', 'woonoow'),
            'category' => 'orders',
            'recipient_type' => 'staff',
            'wc_email' => 'new_order',
            'enabled' => true,
        ],
        'order_placed_customer' => [
            'id' => 'order_placed',
            'label' => __('Order Placed', 'woonoow'),
            'description' => __('When customer places an order', 'woonoow'),
            'category' => 'orders',
            'recipient_type' => 'customer',
            'wc_email' => 'customer_on_hold_order',
            'enabled' => true,
        ],
        'order_pending' => [
            'id' => 'order_pending',
            'label' => __('Order Pending', 'woonoow'),
            'description' => __('When order is created (pending payment)', 'woonoow'),
            'category' => 'orders',
            'recipient_type' => 'staff',
            'wc_email' => '',
            'enabled' => true,
        ],
        'order_pending_customer' => [
            'id' => 'order_pending',
            'label' => __('Order Pending', 'woonoow'),
            'description' => __('When order is created (pending payment)', 'woonoow'),
            'category' => 'orders',
            'recipient_type' => 'customer',
            'wc_email' => '',
            'enabled' => true,
        ],

        // ===== PAYMENT PROCESSING =====
        'order_on_hold' => [
            'id' => 'order_on_hold',
            'label' => __('Order On-Hold', 'woonoow'),
            'description' => __('When order is awaiting payment', 'woonoow'),
            'category' => 'orders',
            'recipient_type' => 'staff',
            'wc_email' => '',
            'enabled' => true,
        ],
        'order_on_hold_customer' => [
            'id' => 'order_on_hold',
            'label' => __('Order On-Hold', 'woonoow'),
            'description' => __('When order is awaiting payment', 'woonoow'),
            'category' => 'orders',
            'recipient_type' => 'customer',
            'wc_email' => 'customer_on_hold_order',
            'enabled' => true,
        ],
        'payment_received' => [
            'id' => 'payment_received',
            'label' => __('Payment Received', 'woonoow'),
            'description' => __('When payment is successfully received', 'woonoow'),
            'category' => 'orders',
            'recipient_type' => 'staff',
            'wc_email' => '',
            'enabled' => true,
        ],
        'payment_received_customer' => [
            'id' => 'payment_received',
            'label' => __('Payment Received', 'woonoow'),
            'description' => __('When payment is confirmed', 'woonoow'),
            'category' => 'orders',
            'recipient_type' => 'customer',
            'wc_email' => '',
            'enabled' => true,
        ],
        'payment_failed' => [
            'id' => 'payment_failed',
            'label' => __('Payment Failed', 'woonoow'),
            'description' => __('When payment processing fails', 'woonoow'),
            'category' => 'orders',
            'recipient_type' => 'staff',
            'wc_email' => '',
            'enabled' => true,
        ],
        'payment_failed_customer' => [
            'id' => 'payment_failed',
            'label' => __('Payment Failed', 'woonoow'),
            'description' => __('When payment fails - prompt retry', 'woonoow'),
            'category' => 'orders',
            'recipient_type' => 'customer',
            'wc_email' => 'customer_failed_order',
            'enabled' => true,
        ],

        // ===== ORDER PROCESSING =====
        'order_processing' => [
            'id' => 'order_processing',
            'label' => __('Order Processing', 'woonoow'),
            'description' => __('When order is confirmed and being processed', 'woonoow'),
            'category' => 'orders',
            'recipient_type' => 'staff',
            'wc_email' => 'customer_processing_order',
            'enabled' => true,
        ],
        'order_processing_customer' => [
            'id' => 'order_processing',
            'label' => __('Order Processing', 'woonoow'),
            'description' => __('When order status changes to processing', 'woonoow'),
            'category' => 'orders',
            'recipient_type' => 'customer',
            'wc_email' => 'customer_processing_order',
            'enabled' => true,
        ],

        // ===== FULFILLMENT =====
        'order_shipped' => [
            'id' => 'order_shipped',
            'label' => __('Order Shipped', 'woonoow'),
            'description' => __('When order is shipped', 'woonoow'),
            'category' => 'orders',
            'recipient_type' => 'staff',
            'wc_email' => '',
            'enabled' => true,
        ],
        'order_shipped_customer' => [
            'id' => 'order_shipped',
            'label' => __('Order Shipped', 'woonoow'),
            'description' => __('When order is shipped with tracking', 'woonoow'),
            'category' => 'orders',
            'recipient_type' => 'customer',
            'wc_email' => '',
            'enabled' => true,
        ],
        'order_completed' => [
            'id' => 'order_completed',
            'label' => __('Order Completed', 'woonoow'),
            'description' => __('When order is marked as completed', 'woonoow'),
            'category' => 'orders',
            'recipient_type' => 'staff',
            'wc_email' => 'customer_completed_order',
            'enabled' => true,
        ],
        'order_completed_customer' => [
            'id' => 'order_completed',
            'label' => __('Order Completed', 'woonoow'),
            'description' => __('When order is delivered/completed', 'woonoow'),
            'category' => 'orders',
            'recipient_type' => 'customer',
            'wc_email' => 'customer_completed_order',
            'enabled' => true,
        ],

        // ===== ORDER ISSUES / EXCEPTIONS =====
        'order_failed' => [
            'id' => 'order_failed',
            'label' => __('Order Failed', 'woonoow'),
            'description' => __('When order fails', 'woonoow'),
            'category' => 'orders',
            'recipient_type' => 'staff',
            'wc_email' => 'failed_order',
            'enabled' => true,
        ],
        'order_failed_customer' => [
            'id' => 'order_failed',
            'label' => __('Order Failed', 'woonoow'),
            'description' => __('When order fails', 'woonoow'),
            'category' => 'orders',
            'recipient_type' => 'customer',
            'wc_email' => 'customer_failed_order',
            'enabled' => true,
        ],
        'order_cancelled' => [
            'id' => 'order_cancelled',
            'label' => __('Order Cancelled', 'woonoow'),
            'description' => __('When order is cancelled', 'woonoow'),
            'category' => 'orders',
            'recipient_type' => 'staff',
            'wc_email' => 'cancelled_order',
            'enabled' => true,
        ],
        'order_cancelled_customer' => [
            'id' => 'order_cancelled',
            'label' => __('Order Cancelled', 'woonoow'),
            'description' => __('When order is cancelled', 'woonoow'),
            'category' => 'orders',
            'recipient_type' => 'customer',
            'wc_email' => 'customer_refunded_order',
            'enabled' => true,
        ],
        'order_refunded' => [
            'id' => 'order_refunded',
            'label' => __('Order Refunded', 'woonoow'),
            'description' => __('When order is refunded', 'woonoow'),
            'category' => 'orders',
            'recipient_type' => 'staff',
            'wc_email' => '',
            'enabled' => true,
        ],
        'order_refunded_customer' => [
            'id' => 'order_refunded',
            'label' => __('Order Refunded', 'woonoow'),
            'description' => __('When order is refunded', 'woonoow'),
            'category' => 'orders',
            'recipient_type' => 'customer',
            'wc_email' => 'customer_refunded_order',
            'enabled' => true,
        ],
    ];
    
    /**
     * Filter: woonoow_notification_events_registry
     * 
     * Allows plugins/themes to add custom notification events
     * 
     * @param array $events Event definitions
     */
    return apply_filters('woonoow_notification_events_registry', $events);
}
	
	/**
	 * Get events by recipient type
	 * 
	 * @param string $recipient_type 'staff' or 'customer'
	 * @return array Filtered events
	 */
	public static function get_events_by_recipient($recipient_type) {
		$all_events = self::get_all_events();
		
		return array_filter($all_events, function($event) use ($recipient_type) {
			return $event['recipient_type'] === $recipient_type;
		});
	}
	
	/**
	 * Get events by category
	 * 
	 * @param string $category 'orders', 'products', 'customers'
	 * @return array Filtered events
	 */
	public static function get_events_by_category($category) {
		$all_events = self::get_all_events();
		
		return array_filter($all_events, function($event) use ($category) {
			return $event['category'] === $category;
		});
	}
	
	/**
	 * Get single event definition
	 * 
	 * @param string $event_id Event ID
	 * @param string $recipient_type Recipient type
	 * @return array|null Event definition or null if not found
	 */
	public static function get_event($event_id, $recipient_type) {
		$all_events = self::get_all_events();
		
		foreach ($all_events as $event) {
			if ($event['id'] === $event_id && $event['recipient_type'] === $recipient_type) {
				return $event;
			}
		}
		
		return null;
	}
	
	/**
	 * Check if event exists
	 * 
	 * @param string $event_id Event ID
	 * @param string $recipient_type Recipient type
	 * @return bool
	 */
	public static function event_exists($event_id, $recipient_type) {
		return self::get_event($event_id, $recipient_type) !== null;
	}
	
	/**
	 * Get variables available for a specific event
	 * 
	 * Returns both common variables and event-specific variables
	 * 
	 * @param string $event_id Event ID
	 * @param string $recipient_type Recipient type
	 * @return array Array of variable definitions with key => description
	 */
	public static function get_variables_for_event($event_id, $recipient_type = 'customer') {
		// Common variables available for ALL events
		$common = [
			'{site_name}' => __('Store/Site name', 'woonoow'),
			'{site_title}' => __('Site title', 'woonoow'),
			'{store_url}' => __('Store URL', 'woonoow'),
			'{shop_url}' => __('Shop page URL', 'woonoow'),
			'{my_account_url}' => __('My Account page URL', 'woonoow'),
			'{login_url}' => __('Login page URL', 'woonoow'),
			'{support_email}' => __('Support email address', 'woonoow'),
			'{current_year}' => __('Current year', 'woonoow'),
			'{current_date}' => __('Current date', 'woonoow'),
		];
		
		// Customer variables (for customer-facing events)
		$customer_vars = [
			'{customer_name}' => __('Customer full name', 'woonoow'),
			'{customer_first_name}' => __('Customer first name', 'woonoow'),
			'{customer_last_name}' => __('Customer last name', 'woonoow'),
			'{customer_email}' => __('Customer email', 'woonoow'),
			'{customer_phone}' => __('Customer phone', 'woonoow'),
		];
		
		// Order variables (for order-related events)
		$order_vars = [
			'{order_id}' => __('Order ID/number', 'woonoow'),
			'{order_number}' => __('Order number', 'woonoow'),
			'{order_date}' => __('Order date', 'woonoow'),
			'{order_total}' => __('Order total', 'woonoow'),
			'{order_subtotal}' => __('Order subtotal', 'woonoow'),
			'{order_tax}' => __('Order tax', 'woonoow'),
			'{order_shipping}' => __('Shipping cost', 'woonoow'),
			'{order_discount}' => __('Discount amount', 'woonoow'),
			'{order_status}' => __('Order status', 'woonoow'),
			'{order_url}' => __('Order details URL', 'woonoow'),
			'{order_items_table}' => __('Order items table (HTML)', 'woonoow'),
			'{billing_address}' => __('Billing address', 'woonoow'),
			'{shipping_address}' => __('Shipping address', 'woonoow'),
			'{payment_method}' => __('Payment method', 'woonoow'),
			'{payment_status}' => __('Payment status', 'woonoow'),
			'{shipping_method}' => __('Shipping method', 'woonoow'),
		];
		
		// Shipping/tracking variables (for shipped/delivered events)
		$shipping_vars = [
			'{tracking_number}' => __('Tracking number', 'woonoow'),
			'{tracking_url}' => __('Tracking URL', 'woonoow'),
			'{shipping_carrier}' => __('Shipping carrier', 'woonoow'),
			'{estimated_delivery}' => __('Estimated delivery date', 'woonoow'),
		];
		
		// Product variables (for stock alerts)
		$product_vars = [
			'{product_name}' => __('Product name', 'woonoow'),
			'{product_sku}' => __('Product SKU', 'woonoow'),
			'{product_url}' => __('Product URL', 'woonoow'),
			'{product_price}' => __('Product price', 'woonoow'),
			'{stock_quantity}' => __('Stock quantity', 'woonoow'),
		];
		
		// Newsletter variables
		$newsletter_vars = [
			'{subscriber_email}' => __('Subscriber email', 'woonoow'),
			'{subscriber_name}' => __('Subscriber name', 'woonoow'),
			'{unsubscribe_url}' => __('Unsubscribe link', 'woonoow'),
		];
		
		// Build variables based on event ID and category
		$event = self::get_event($event_id, $recipient_type);
		
		// If event not found, try to match by just event_id
		if (!$event) {
			$all_events = self::get_all_events();
			foreach ($all_events as $e) {
				if ($e['id'] === $event_id) {
					$event = $e;
					break;
				}
			}
		}
		
		// Start with common vars
		$variables = $common;
		
		// Add category-specific vars
		if ($event) {
			$category = $event['category'] ?? '';
			
			// Add customer vars for customer-facing events
			if (($event['recipient_type'] ?? '') === 'customer') {
				$variables = array_merge($variables, $customer_vars);
			}
			
			// Add based on category
			switch ($category) {
				case 'orders':
					$variables = array_merge($variables, $order_vars);
					// Add tracking for completed/shipped events
					if (in_array($event_id, ['order_completed', 'order_shipped', 'order_delivered'])) {
						$variables = array_merge($variables, $shipping_vars);
					}
					break;
				
				case 'products':
					$variables = array_merge($variables, $product_vars);
					break;
				
				case 'marketing':
					$variables = array_merge($variables, $newsletter_vars);
					// Add campaign-specific for newsletter_campaign
					if ($event_id === 'newsletter_campaign') {
						$variables['{content}'] = __('Campaign content', 'woonoow');
						$variables['{campaign_title}'] = __('Campaign title', 'woonoow');
					}
					break;
				
				case 'customers':
					$variables = array_merge($variables, $customer_vars);
					// Add account-specific vars
					if ($event_id === 'new_customer') {
						$variables['{user_temp_password}'] = __('Temporary password', 'woonoow');
					}
					break;
			}
			
			// Add event-specific variables if defined
			if (!empty($event['variables'])) {
				$variables = array_merge($variables, $event['variables']);
			}
		}
		
		// Sort alphabetically for easier browsing
		ksort($variables);
		
		return $variables;
	}
}