<?php

namespace App\Http\Controllers\Shop;

use App\Http\Controllers\Controller;
use App\Models\Coupon;
use App\Models\ShippingRate;
use App\Services\CartService;
use App\Services\OrderService;
use Illuminate\Http\Request;

class CheckoutController extends Controller
{
    public function __construct(
        private CartService $cart,
        private OrderService $orderService,
    ) {}

    public function index()
    {
        if ($this->cart->count() === 0) {
            return redirect()->route('cart.index')->with('error', 'Ihr Warenkorb ist leer.');
        }
        $subtotal     = $this->cart->subtotal();
        $country      = session('checkout_country', 'DE');
        $shippingRate = ShippingRate::forCart($subtotal, $country);
        $shippingCost = $shippingRate ? $shippingRate->getCostForTotal($subtotal) : 0;
        $discount     = $this->getCouponDiscount($subtotal);
        $total        = max(0, $subtotal - $discount) + $shippingCost;
        $userAddresses = auth()->user()?->addresses ?? collect();
        $couponCode   = session('coupon_code');

        return view('shop.checkout.index', compact('subtotal', 'shippingCost', 'total', 'userAddresses', 'discount', 'couponCode'));
    }

    public function applyCoupon(Request $request)
    {
        $code = trim($request->input('coupon_code', ''));
        if (!$code) {
            return back()->with('coupon_error', 'Bitte Gutscheincode eingeben.');
        }
        $coupon = Coupon::findValid($code);
        if (!$coupon) {
            return back()->with('coupon_error', 'Gutscheincode ungültig oder abgelaufen.');
        }
        $subtotal = $this->cart->subtotal();
        if ($coupon->min_order_value && $subtotal < $coupon->min_order_value) {
            return back()->with('coupon_error', 'Mindestbestellwert von ' . number_format($coupon->min_order_value, 2, ',', '.') . ' € nicht erreicht.');
        }
        session(['coupon_code' => $coupon->code]);
        return back()->with('coupon_success', 'Gutschein "' . $coupon->code . '" angewendet!');
    }

    public function removeCoupon()
    {
        session()->forget('coupon_code');
        return back()->with('coupon_success', 'Gutschein entfernt.');
    }

    public function shippingCost(Request $request)
    {
        $country = strtoupper($request->input('country', 'DE'));
        session(['checkout_country' => $country]);
        $subtotal     = $this->cart->subtotal();
        $shippingRate = ShippingRate::forCart($subtotal, $country);
        $cost         = $shippingRate ? $shippingRate->getCostForTotal($subtotal) : 0;
        return response()->json(['cost' => $cost, 'formatted' => number_format($cost, 2, ',', '.') . ' €']);
    }

    public function storeAddress(Request $request)
    {
        $rules = [
            'billing.first_name' => 'required|string|max:100',
            'billing.last_name'  => 'required|string|max:100',
            'billing.street'     => 'required|string|max:255',
            'billing.zip'        => 'required|string|max:10',
            'billing.city'       => 'required|string|max:100',
            'billing.country'    => 'required|string|max:2',
            'payment_method'     => 'required|in:prepayment,invoice',
            'agb'                => 'accepted',
        ];

        if (!auth()->check()) {
            $rules['email'] = 'required|email';
        }

        if ($request->input('shipping_same') !== '1') {
            $rules['shipping.first_name'] = 'required|string|max:100';
            $rules['shipping.last_name']  = 'required|string|max:100';
            $rules['shipping.street']     = 'required|string|max:255';
            $rules['shipping.zip']        = 'required|string|max:10';
            $rules['shipping.city']       = 'required|string|max:100';
            $rules['shipping.country']    = 'required|string|max:2';
        }

        $data = $request->validate($rules);

        if ($request->input('shipping_same') === '1') {
            $data['shipping'] = $data['billing'];
        }

        $data['email'] = $request->input('email');

        session(['checkout_data' => $data]);

        if ($data['payment_method'] === 'paypal') {
            return redirect()->route('paypal.redirect');
        }

        return redirect()->route('checkout.confirm');
    }

    public function payment()
    {
        return redirect()->route('checkout.index');
    }

    public function confirm(Request $request)
    {
        $checkoutData = session('checkout_data');
        if (!$checkoutData || $this->cart->count() === 0) {
            return redirect()->route('checkout.index');
        }

        if ($request->isMethod('get')) {
            $items        = $this->cart->get();
            $subtotal     = $this->cart->subtotal();
            $country      = $checkoutData['shipping']['country'] ?? $checkoutData['billing']['country'] ?? 'DE';
            $shippingRate = ShippingRate::forCart($subtotal, $country);
            $shippingCost = $shippingRate ? $shippingRate->getCostForTotal($subtotal) : 0;
            $discount     = $this->getCouponDiscount($subtotal);
            $total        = max(0, $subtotal - $discount) + $shippingCost;
            $couponCode   = session('coupon_code');
            return view('shop.checkout.confirm', compact('checkoutData', 'items', 'subtotal', 'shippingCost', 'total', 'discount', 'couponCode'));
        }

        $order = $this->orderService->createFromSession(
            $checkoutData,
            $checkoutData['payment_method']
        );

        session()->forget(['checkout_data', 'checkout_country']);

        return redirect()->route('checkout.thankyou', $order->order_number);
    }

    public function thankyou(string $order)
    {
        $order = \App\Models\Order::where('order_number', $order)->firstOrFail();
        return view('shop.checkout.thankyou', compact('order'));
    }

    private function getCouponDiscount(float $subtotal): float
    {
        if ($code = session('coupon_code')) {
            $coupon = Coupon::findValid($code);
            if ($coupon) {
                return $coupon->calcDiscount($subtotal);
            }
        }
        return 0;
    }
}