<?php

declare(strict_types=1);

namespace App\Models;

use App\Core\Database\Database;
use PDO;

class EmployeeOrder
{
    public static function getBySessionId(int $sessionId): array
    {
        $db = Database::getConnection();
        $stmt = $db->prepare("
            SELECT eo.*, u.name as user_name, u.username as mattermost_username, u.email as user_email
            FROM employee_orders eo
            JOIN users u ON eo.user_id = u.id
            WHERE eo.session_id = ?
            ORDER BY eo.id ASC
        ");
        $stmt->execute([$sessionId]);
        $orders = $stmt->fetchAll();

        foreach ($orders as &$order) {
            $order['items'] = self::getItemsByOrderId((int)$order['id']);
        }

        return $orders;
    }

    public static function getItemsByOrderId(int $orderId): array
    {
        $db = Database::getConnection();
        $stmt = $db->prepare("SELECT * FROM employee_order_items WHERE employee_order_id = ? ORDER BY id ASC");
        $stmt->execute([$orderId]);
        return $stmt->fetchAll();
    }

    public static function findUserOrderBySession(int $sessionId, int $userId): ?array
    {
        $db = Database::getConnection();
        $stmt = $db->prepare("SELECT * FROM employee_orders WHERE session_id = ? AND user_id = ?");
        $stmt->execute([$sessionId, $userId]);
        $order = $stmt->fetch();

        if (!$order) {
            return null;
        }

        $order['items'] = self::getItemsByOrderId((int)$order['id']);
        return $order;
    }

    public static function createOrder(int $sessionId, int $userId, ?string $notes, array $items): int
    {
        $db = Database::getConnection();
        $db->beginTransaction();

        try {
            $stmtOrder = $db->prepare("
                INSERT INTO employee_orders (session_id, user_id, status, notes, total_bill) 
                VALUES (?, ?, 'unpaid', ?, 0.00)
            ");
            $stmtOrder->execute([$sessionId, $userId, $notes]);
            $orderId = (int)$db->lastInsertId();

            $stmtItem = $db->prepare("
                INSERT INTO employee_order_items (employee_order_id, session_menu_id, item_name, quantity, unit_price, total_price, notes) 
                VALUES (?, ?, ?, ?, ?, ?, ?)
            ");

            $totalBill = 0.0;

            foreach ($items as $item) {
                $menuId = !empty($item['session_menu_id']) ? (int)$item['session_menu_id'] : null;
                $name = trim((string)($item['item_name'] ?? ''));
                $qty = max(1, (int)($item['quantity'] ?? 1));
                $unitPrice = (float)($item['unit_price'] ?? 0.0);
                $lineTotal = $qty * $unitPrice;
                $itemNotes = trim((string)($item['notes'] ?? ''));

                if (empty($name)) {
                    continue;
                }

                $stmtItem->execute([
                    $orderId,
                    $menuId,
                    $name,
                    $qty,
                    $unitPrice,
                    $lineTotal,
                    $itemNotes
                ]);

                $totalBill += $lineTotal;
            }

            // Update total bill
            $stmtUpdateTotal = $db->prepare("UPDATE employee_orders SET total_bill = ? WHERE id = ?");
            $stmtUpdateTotal->execute([$totalBill, $orderId]);

            $db->commit();
            return $orderId;
        } catch (\Throwable $e) {
            $db->rollBack();
            throw $e;
        }
    }

    public static function togglePaid(int $orderId): bool
    {
        $db = Database::getConnection();
        $stmt = $db->prepare("
            UPDATE employee_orders 
            SET status = CASE WHEN status = 'paid' THEN 'unpaid' ELSE 'paid' END,
                updated_at = datetime('now', 'localtime')
            WHERE id = ?
        ");
        return $stmt->execute([$orderId]);
    }

    public static function delete(int $orderId): bool
    {
        $db = Database::getConnection();
        $stmt = $db->prepare("DELETE FROM employee_orders WHERE id = ?");
        return $stmt->execute([$orderId]);
    }
}