<?php

namespace App\Services;

use App\Mail\OrderConfirmationMail;
use App\Mail\OrderShippedMail;
use App\Models\Coupon;
use App\Models\Order;
use App\Models\OrderAddress;
use App\Models\OrderItem;
use App\Models\ProductVariant;
use App\Models\ShippingRate;
use Illuminate\Support\Facades\Mail;

class OrderService
{
    public function __construct(private CartService $cart) {}

    public function createFromSession(array $addressData, string $paymentMethod): Order
    {
        $items    = $this->cart->get();
        $subtotal = $this->cart->subtotal();

        $country      = $addressData['shipping']['country'] ?? $addressData['billing']['country'] ?? 'DE';
        $shippingRate = ShippingRate::forCart($subtotal, $country);
        $shippingCost = $shippingRate ? $shippingRate->getCostForTotal($subtotal) : 0;

        // Gutschein aus Session
        $couponCode     = null;
        $discountAmount = 0;
        if ($code = session('coupon_code')) {
            $coupon = Coupon::findValid($code);
            if ($coupon) {
                $discountAmount = $coupon->calcDiscount($subtotal);
                $couponCode     = $coupon->code;
                $coupon->increment('used_count');
            }
        }

        $taxable = max(0, $subtotal - $discountAmount);
        $taxTotal = array_sum(array_map(function ($item) use ($subtotal, $discountAmount) {
            $ratio = $subtotal > 0 ? ($item['price'] * $item['qty']) / $subtotal : 0;
            $itemNet = ($item['price'] * $item['qty'] - $discountAmount * $ratio) / (1 + $item['tax_rate'] / 100);
            return round(($item['price'] * $item['qty'] - $discountAmount * $ratio) - $itemNet, 2);
        }, $items));

        $total = max(0, $subtotal - $discountAmount) + $shippingCost;

        $order = Order::create([
            'order_number'    => Order::generateOrderNumber(),
            'user_id'         => auth()->id(),
            'guest_email'     => auth()->check() ? null : ($addressData['email'] ?? null),
            'status'          => 'new',
            'payment_method'  => $paymentMethod,
            'coupon_code'     => $couponCode,
            'discount_amount' => $discountAmount,
            'subtotal'        => $subtotal,
            'tax_total'       => $taxTotal,
            'shipping_cost'   => $shippingCost,
            'total'           => $total,
        ]);

        foreach ($items as $item) {
            OrderItem::create([
                'order_id'           => $order->id,
                'product_variant_id' => $item['variant_id'],
                'product_name'       => $item['product_name'],
                'variant_label'      => $item['variant_label'],
                'quantity'           => $item['qty'],
                'unit_price'         => $item['price'],
                'tax_rate'           => $item['tax_rate'],
            ]);
            $variant = ProductVariant::with('product')->find($item['variant_id']);
            if ($variant && $variant->product->track_stock) {
                $variant->decrement('stock', $item['qty']);
            }
        }

        foreach (['billing', 'shipping'] as $type) {
            $src = $addressData[$type] ?? $addressData['billing'];
            OrderAddress::create(array_merge($src, ['order_id' => $order->id, 'type' => $type]));
        }

        $this->cart->clear();
        session()->forget('coupon_code');

        Mail::to($order->guest_email ?? $order->user?->email)->send(new OrderConfirmationMail($order));

        return $order;
    }

    public function updateStatus(Order $order, string $newStatus, ?string $trackingCode = null): void
    {
        $order->status = $newStatus;

        if ($newStatus === 'payment_received' && !$order->paid_at) {
            $order->paid_at = now();
        }

        if ($trackingCode) {
            $order->tracking_code = $trackingCode;
        }

        $order->save();

        if ($newStatus === 'shipped') {
            $email = $order->guest_email ?? $order->user?->email;
            if ($email) {
                Mail::to($email)->send(new OrderShippedMail($order));
            }
        }
    }
}