<?php
/**
 * Email Manager
 * 
 * Manages custom email notifications and disables WooCommerce default emails
 * 
 * @package WooNooW\Core\Notifications
 */

namespace WooNooW\Core\Notifications;

class EmailManager {
	
	/**
	 * Instance
	 */
	private static $instance = null;
	
	/**
	 * Get instance
	 */
	public static function instance() {
		if (null === self::$instance) {
			self::$instance = new self();
		}
		return self::$instance;
	}
	
	/**
	 * Constructor
	 */
	private function __construct() {
		$this->init_hooks();
	}
	
	/**
	 * Initialize hooks
	 */
	private function init_hooks() {
		// Disable WooCommerce emails to prevent duplicates
		add_action('woocommerce_email', [$this, 'disable_wc_emails'], 1);
		
		// Hook into WooCommerce order status changes
		add_action('woocommerce_order_status_pending_to_processing', [$this, 'send_order_processing_email'], 10, 2);
		add_action('woocommerce_order_status_pending_to_completed', [$this, 'send_order_completed_email'], 10, 2);
		add_action('woocommerce_order_status_processing_to_completed', [$this, 'send_order_completed_email'], 10, 2);
		add_action('woocommerce_order_status_completed', [$this, 'send_order_completed_email'], 10, 2);
		add_action('woocommerce_order_status_pending_to_on-hold', [$this, 'send_order_on_hold_email'], 10, 2);
		add_action('woocommerce_order_status_failed_to_processing', [$this, 'send_order_processing_email'], 10, 2);
		add_action('woocommerce_order_status_cancelled', [$this, 'send_order_cancelled_email'], 10, 2);
		add_action('woocommerce_order_status_refunded', [$this, 'send_order_refunded_email'], 10, 2);
		add_action('woocommerce_order_fully_refunded', [$this, 'send_order_refunded_email'], 10, 2);
		
		// New order notification for admin
		add_action('woocommerce_new_order', [$this, 'send_new_order_admin_email'], 10, 1);
		
		// Customer note
		add_action('woocommerce_new_customer_note', [$this, 'send_customer_note_email'], 10, 1);
		
		// New customer account
		add_action('woocommerce_created_customer', [$this, 'send_new_customer_email'], 10, 3);
		
		// Low stock / Out of stock
		add_action('woocommerce_low_stock', [$this, 'send_low_stock_email'], 10, 1);
		add_action('woocommerce_no_stock', [$this, 'send_out_of_stock_email'], 10, 1);
		add_action('woocommerce_product_set_stock', [$this, 'check_stock_levels'], 10, 1);
	}
	
	/**
	 * Check if WooNooW notification system is enabled
	 * 
	 * @return bool
	 */
	public static function is_enabled() {
		// Check global notification system mode
		$system_mode = get_option('woonoow_notification_system_mode', 'woonoow');
		return $system_mode === 'woonoow';
	}
	
	/**
	 * Disable WooCommerce default emails
	 * 
	 * @param WC_Emails $email_class
	 */
	public function disable_wc_emails($email_class) {
		// Only disable WC emails if WooNooW system is enabled
		if (!self::is_enabled()) {
			return; // Keep WC emails if WooNooW system disabled
		}
		
		// Disable all WooCommerce transactional emails
		$emails_to_disable = [
			'WC_Email_New_Order',                    // Admin: New order
			'WC_Email_Cancelled_Order',              // Admin: Cancelled order
			'WC_Email_Failed_Order',                 // Admin: Failed order
			'WC_Email_Customer_On_Hold_Order',       // Customer: Order on-hold
			'WC_Email_Customer_Processing_Order',    // Customer: Processing order
			'WC_Email_Customer_Completed_Order',     // Customer: Completed order
			'WC_Email_Customer_Refunded_Order',      // Customer: Refunded order
			'WC_Email_Customer_Invoice',             // Customer: Invoice
			'WC_Email_Customer_Note',                // Customer: Note added
			'WC_Email_Customer_Reset_Password',      // Customer: Reset password
			'WC_Email_Customer_New_Account',         // Customer: New account
		];
		
		foreach ($emails_to_disable as $email_id) {
			add_filter('woocommerce_email_enabled_' . strtolower(str_replace('WC_Email_', '', $email_id)), '__return_false');
		}
	}
	
	/**
	 * Send order processing email
	 * 
	 * @param int $order_id
	 * @param WC_Order $order
	 */
	public function send_order_processing_email($order_id, $order = null) {
		if (!$order) {
			$order = wc_get_order($order_id);
		}
		
		if (!$order) {
			return;
		}
		
		// Check if event is enabled
		if (!$this->is_event_enabled('order_processing', 'email', 'customer')) {
			return;
		}
		
		// Send email
		$this->send_email('order_processing', 'customer', $order);
	}
	
	/**
	 * Send order completed email
	 * 
	 * @param int $order_id
	 * @param WC_Order $order
	 */
	public function send_order_completed_email($order_id, $order = null) {
		if (!$order) {
			$order = wc_get_order($order_id);
		}
		
		if (!$order) {
			return;
		}
		
		// Check if event is enabled
		if (!$this->is_event_enabled('order_completed', 'email', 'customer')) {
			return;
		}
		
		// Send email
		$this->send_email('order_completed', 'customer', $order);
	}
	
	/**
	 * Send order on-hold email
	 * 
	 * @param int $order_id
	 * @param WC_Order $order
	 */
	public function send_order_on_hold_email($order_id, $order = null) {
		if (!$order) {
			$order = wc_get_order($order_id);
		}
		
		if (!$order) {
			return;
		}
		
		// Check if event is enabled
		if (!$this->is_event_enabled('order_processing', 'email', 'customer')) {
			return;
		}
		
		// Send email (use processing template for on-hold)
		$this->send_email('order_processing', 'customer', $order);
	}
	
	/**
	 * Send order cancelled email
	 * 
	 * @param int $order_id
	 * @param WC_Order $order
	 */
	public function send_order_cancelled_email($order_id, $order = null) {
		if (!$order) {
			$order = wc_get_order($order_id);
		}
		
		if (!$order) {
			return;
		}
		
		// Send to admin
		if ($this->is_event_enabled('order_cancelled', 'email', 'staff')) {
			$this->send_email('order_cancelled', 'staff', $order);
		}
	}
	
	/**
	 * Send order refunded email
	 * 
	 * @param int $order_id
	 * @param WC_Order $order
	 */
	public function send_order_refunded_email($order_id, $order = null) {
		if (!$order) {
			$order = wc_get_order($order_id);
		}
		
		if (!$order) {
			return;
		}
		
		// Check if event is enabled
		if (!$this->is_event_enabled('order_refunded', 'email', 'customer')) {
			return;
		}
		
		// Send email
		$this->send_email('order_refunded', 'customer', $order);
	}
	
	/**
	 * Send new order admin email
	 * 
	 * @param int $order_id
	 */
	public function send_new_order_admin_email($order_id) {
		$order = wc_get_order($order_id);
		
		if (!$order) {
			return;
		}
		
		// Check if event is enabled
		if (!$this->is_event_enabled('order_placed', 'email', 'staff')) {
			return;
		}
		
		// Send email
		$this->send_email('order_placed', 'staff', $order);
	}
	
	/**
	 * Send customer note email
	 * 
	 * @param array $args
	 */
	public function send_customer_note_email($args) {
		$order = wc_get_order($args['order_id']);
		
		if (!$order) {
			return;
		}
		
		// Check if event is enabled
		if (!$this->is_event_enabled('customer_note', 'email', 'customer')) {
			return;
		}
		
		// Send email with note data
		$this->send_email('customer_note', 'customer', $order, ['note' => $args['customer_note']]);
	}
	
	/**
	 * Send new customer email
	 * 
	 * @param int $customer_id
	 * @param array $new_customer_data
	 * @param bool $password_generated
	 */
	public function send_new_customer_email($customer_id, $new_customer_data = [], $password_generated = false) {
		// Check if event is enabled
		if (!$this->is_event_enabled('new_customer', 'email', 'customer')) {
			return;
		}
		
		$customer = new \WC_Customer($customer_id);
		
		// Send email
		$this->send_email('new_customer', 'customer', $customer, [
			'password_generated' => $password_generated,
			'user_login' => $new_customer_data['user_login'] ?? '',
			'user_pass' => $new_customer_data['user_pass'] ?? '',
		]);
	}
	
	/**
	 * Send low stock email
	 * 
	 * @param WC_Product $product
	 */
	public function send_low_stock_email($product) {
		// Check if event is enabled
		if (!$this->is_event_enabled('low_stock', 'email', 'staff')) {
			return;
		}
		
		// Send email
		$this->send_email('low_stock', 'staff', $product);
	}
	
	/**
	 * Send out of stock email
	 * 
	 * @param WC_Product $product
	 */
	public function send_out_of_stock_email($product) {
		// Check if event is enabled
		if (!$this->is_event_enabled('out_of_stock', 'email', 'staff')) {
			return;
		}
		
		// Send email
		$this->send_email('out_of_stock', 'staff', $product);
	}
	
	/**
	 * Check stock levels when product stock is updated
	 * 
	 * @param WC_Product $product
	 */
	public function check_stock_levels($product) {
		$stock = $product->get_stock_quantity();
		$low_stock_threshold = get_option('woocommerce_notify_low_stock_amount', 2);
		
		if ($stock <= 0) {
			$this->send_out_of_stock_email($product);
		} elseif ($stock <= $low_stock_threshold) {
			$this->send_low_stock_email($product);
		}
	}
	
	/**
	 * Check if event is enabled
	 * 
	 * @param string $event_id
	 * @param string $channel_id
	 * @param string $recipient_type
	 * @return bool
	 */
	private function is_event_enabled($event_id, $channel_id, $recipient_type) {
		$settings = get_option('woonoow_notification_settings', []);
		
		// Check if event exists and channel is enabled
		if (isset($settings['events'][$event_id]['channels'][$channel_id])) {
			return $settings['events'][$event_id]['channels'][$channel_id]['enabled'] ?? false;
		}
		
		return false;
	}
	
	/**
	 * Send email
	 * 
	 * @param string $event_id
	 * @param string $recipient_type
	 * @param mixed $data
	 * @param array $extra_data
	 */
	private function send_email($event_id, $recipient_type, $data, $extra_data = []) {
		// Get email renderer
		$renderer = EmailRenderer::instance();
		
		// Render email
		$email = $renderer->render($event_id, $recipient_type, $data, $extra_data);
		
		if (!$email) {
			return;
		}
		
		// Send email via wp_mail
		$headers = [
			'Content-Type: text/html; charset=UTF-8',
			'From: ' . get_bloginfo('name') . ' <' . get_option('admin_email') . '>',
		];
		
		wp_mail($email['to'], $email['subject'], $email['body'], $headers);
		
		// Log email sent
		do_action('woonoow_email_sent', $event_id, $recipient_type, $email);
	}
}