<?php
/**
 * User notifications system
 *
 * @package Matreshka
 */

// Exit if accessed directly
if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

/**
 * Get user notifications
 * 
 * @param int|null $user_id User ID. If null, uses current user.
 * @param int $limit Number of notifications to retrieve. -1 for all.
 * @return array Array of notifications
 */
function matreshka_get_user_notifications( $user_id = null, $limit = -1 ) {
	if ( ! $user_id ) {
		$user_id = get_current_user_id();
	}
	
	$notifications = get_user_meta( $user_id, 'matreshka_notifications', true );
	
	if ( empty( $notifications ) || ! is_array( $notifications ) ) {
		return array();
	}
	
	// Sort by date (newest first)
	usort( $notifications, function( $a, $b ) {
		$date_a = isset( $a['date'] ) ? $a['date'] : 0;
		$date_b = isset( $b['date'] ) ? $b['date'] : 0;
		return $date_b - $date_a;
	});
	
	// Limit results if needed
	if ( $limit > 0 ) {
		$notifications = array_slice( $notifications, 0, $limit );
	}
	
	return $notifications;
}

/**
 * Clear all notifications for user
 * 
 * @param int|null $user_id User ID. If null, uses current user.
 * @return bool True on success, false on failure
 */
function matreshka_clear_all_notifications( $user_id = null ) {
	if ( ! $user_id ) {
		$user_id = get_current_user_id();
	}
	
	// Set empty array instead of deleting meta to prevent demo notifications from showing
	return update_user_meta( $user_id, 'matreshka_notifications', array() );
}

/**
 * Add notification for user
 * 
 * @param int $user_id User ID
 * @param string $title Notification title
 * @param string $content Notification content
 * @param array $args Additional arguments (type, link, etc.)
 * @return bool True on success, false on failure
 */
function matreshka_add_notification( $user_id, $title, $content, $args = array() ) {
	$notifications = get_user_meta( $user_id, 'matreshka_notifications', true );
	
	if ( empty( $notifications ) || ! is_array( $notifications ) ) {
		$notifications = array();
	}
	
	$notification = array(
		'title' => sanitize_text_field( $title ),
		'content' => sanitize_textarea_field( $content ),
		'date' => current_time( 'timestamp' ),
		'read' => false,
	);
	
	// Merge with additional arguments
	$notification = array_merge( $notification, $args );
	
	// Add to beginning of array (newest first)
	array_unshift( $notifications, $notification );
	
	// Keep only last 100 notifications
	$notifications = array_slice( $notifications, 0, 100 );
	
	return update_user_meta( $user_id, 'matreshka_notifications', $notifications );
}

/**
 * Mark notification as read
 * 
 * @param int $user_id User ID
 * @param int $notification_index Index of notification in array
 * @return bool True on success, false on failure
 */
function matreshka_mark_notification_read( $user_id, $notification_index ) {
	$notifications = get_user_meta( $user_id, 'matreshka_notifications', true );
	
	if ( empty( $notifications ) || ! isset( $notifications[ $notification_index ] ) ) {
		return false;
	}
	
	$notifications[ $notification_index ]['read'] = true;
	
	return update_user_meta( $user_id, 'matreshka_notifications', $notifications );
}

/**
 * Get count of unread notifications
 * 
 * @param int|null $user_id User ID. If null, uses current user.
 * @return int Count of unread notifications
 */
function matreshka_get_unread_notifications_count( $user_id = null ) {
	$notifications = matreshka_get_user_notifications( $user_id );
	
	$unread_count = 0;
	foreach ( $notifications as $notification ) {
		if ( empty( $notification['read'] ) ) {
			$unread_count++;
		}
	}
	
	return $unread_count;
}

/**
 * Clear old notifications (older than 60 days)
 * 
 * @param int $user_id User ID
 * @return bool True on success, false on failure
 */
function matreshka_clear_old_notifications( $user_id ) {
	$notifications = get_user_meta( $user_id, 'matreshka_notifications', true );
	
	if ( empty( $notifications ) || ! is_array( $notifications ) ) {
		return false;
	}
	
	$cutoff_date = current_time( 'timestamp' ) - ( 60 * DAY_IN_SECONDS );
	
	$filtered_notifications = array_filter( $notifications, function( $notification ) use ( $cutoff_date ) {
		$date = isset( $notification['date'] ) ? $notification['date'] : 0;
		return $date >= $cutoff_date;
	});
	
	return update_user_meta( $user_id, 'matreshka_notifications', array_values( $filtered_notifications ) );
}

/**
 * ─── Order status change notifications ───
 */
add_action( 'woocommerce_order_status_changed', 'matreshka_notify_order_status_changed', 10, 4 );

function matreshka_notify_order_status_changed( $order_id, $old_status, $new_status, $order ) {
	$user_id = $order->get_user_id();
	if ( ! $user_id ) {
		return;
	}

	// Skip completed — handled separately with cashback notification
	if ( $new_status === 'completed' ) {
		return;
	}

	$status_labels = [
		'processing' => [ 'Заказ принят ✅',        'Ваш заказ #%d принят и готовится к сборке.' ],
		'on-hold'    => [ 'Заказ на удержании ⏳',  'Заказ #%d ожидает подтверждения оплаты.' ],
		'shipped'    => [ 'Заказ в пути 🚚',        'Ваш заказ #%d передан курьеру и уже в пути!' ],
		'cancelled'  => [ 'Заказ отменён ❌',       'Заказ #%d был отменён. Если это ошибка — свяжитесь с нами.' ],
		'refunded'   => [ 'Возврат средств 💸',     'По заказу #%d оформлен возврат средств.' ],
		'failed'     => [ 'Ошибка оплаты ⚠️',      'Оплата по заказу #%d не прошла. Попробуйте ещё раз.' ],
	];

	if ( ! isset( $status_labels[ $new_status ] ) ) {
		return;
	}

	$label = $status_labels[ $new_status ];

	matreshka_add_notification(
		$user_id,
		$label[0],
		sprintf( $label[1], $order_id ),
		[ 'type' => 'order', 'order_id' => $order_id ]
	);
}

/**
 * ─── Order completed + cashback notification ───
 * Fires after cashback is awarded (priority 21, cashback is priority 20)
 */
add_action( 'woocommerce_order_status_completed', 'matreshka_notify_order_completed', 21 );

function matreshka_notify_order_completed( $order_id ) {
	$order = wc_get_order( $order_id );
	if ( ! $order ) return;

	$user_id = $order->get_user_id();
	if ( ! $user_id ) return;

	$order_total = $order->get_total();

	// Order completed notification
	matreshka_add_notification(
		$user_id,
		'Заказ выполнен! 🎉',
		sprintf( 'Ваш заказ #%d на сумму %s успешно доставлен. Спасибо за покупку!', $order_id, wc_price( $order_total ) ),
		[ 'type' => 'order', 'order_id' => $order_id ]
	);

	// Cashback notification (if cashback was awarded)
	$bonus_points  = $order->get_meta( '_matreshka_cashback_awarded' );
	$cashback_amt  = $order->get_meta( '_matreshka_cashback_amount' );

	if ( $bonus_points && $cashback_amt ) {
		matreshka_add_notification(
			$user_id,
			'Бонусы начислены! 🎁',
			sprintf(
				'За заказ #%d вам начислено %s ₽ кешбека (%d бонусов). Используйте их при следующей покупке!',
				$order_id,
				number_format( (float) $cashback_amt, 2, '.', ' ' ),
				(int) $bonus_points
			),
			[ 'type' => 'cashback', 'order_id' => $order_id ]
		);
	}
}

/**
 * ─── Mark all notifications as read when user visits notifications page ───
 */
add_action( 'template_redirect', 'matreshka_mark_notifications_read_on_visit' );

function matreshka_mark_notifications_read_on_visit() {
	if ( ! is_user_logged_in() ) {
		return;
	}

	// Check if we're on the notifications page (by template or slug)
	if ( ! is_page_template( 'page-notifications.php' ) && ! is_page( 'notifications' ) ) {
		return;
	}

	$user_id = get_current_user_id();
	$notifications = get_user_meta( $user_id, 'matreshka_notifications', true );

	if ( empty( $notifications ) || ! is_array( $notifications ) ) {
		return;
	}

	$changed = false;
	foreach ( $notifications as &$n ) {
		if ( empty( $n['read'] ) ) {
			$n['read'] = true;
			$changed = true;
		}
	}
	unset( $n );

	if ( $changed ) {
		update_user_meta( $user_id, 'matreshka_notifications', $notifications );
	}
}

/**
 * Clean old notifications daily
 */
function matreshka_cleanup_notifications() {
	$users = get_users( array( 'fields' => 'ID' ) );
	
	foreach ( $users as $user_id ) {
		matreshka_clear_old_notifications( $user_id );
	}
}
// Schedule daily cleanup
if ( ! wp_next_scheduled( 'matreshka_daily_cleanup' ) ) {
	wp_schedule_event( time(), 'daily', 'matreshka_daily_cleanup' );
}
add_action( 'matreshka_daily_cleanup', 'matreshka_cleanup_notifications' );

/**
 * AJAX handler for clearing all notifications
 */
function matreshka_ajax_clear_all_notifications() {
	// Check if user is logged in
	if ( ! is_user_logged_in() ) {
		wp_send_json_error( array( 'message' => 'Необходимо войти в систему' ) );
	}
	
	// Verify nonce
	if ( ! check_ajax_referer( 'matreshka_notifications_nonce', 'nonce', false ) ) {
		wp_send_json_error( array( 'message' => 'Недействительный запрос' ) );
	}
	
	$user_id = get_current_user_id();
	$result = matreshka_clear_all_notifications( $user_id );
	
	if ( $result ) {
		wp_send_json_success( array( 'message' => 'Все уведомления удалены' ) );
	} else {
		wp_send_json_error( array( 'message' => 'Ошибка при удалении уведомлений' ) );
	}
}
add_action( 'wp_ajax_matreshka_clear_notifications', 'matreshka_ajax_clear_all_notifications' );