<?php

namespace App\Http\Controllers;

use App\Models\{Cart, Order, OrderItem, Payment};
use Illuminate\Http\Request;
use Illuminate\Support\Str;

class CheckoutController extends Controller
{
    private function userCart(): Cart
    {
        return Cart::firstOrCreate(['user_id' => auth()->id()]);
    }

    public function show()
    {
        $cart = $this->userCart()->load('items.product');

        abort_if($cart->items->isEmpty(), 404);

        $subtotalCents = $cart->items->sum(fn($i) => $i->quantity * $i->unit_price_cents);

        return view('checkout.show', compact('cart', 'subtotalCents'));
    }

    public function placeOrder(Request $request)
    {
        $cart = $this->userCart()->load('items.product');
        abort_if($cart->items->isEmpty(), 404);

        $validated = $request->validate([
            'customer_name' => ['required','string','max:100'],
            'customer_phone' => ['required','string','max:30'],

            'address_line1' => ['required','string','max:200'],
            'address_line2' => ['nullable','string','max:200'],
            'city' => ['required','string','max:100'],
            'state' => ['required','string','max:100'],
            'postcode' => ['required','string','max:20'],
            'country' => ['required','string','max:2'],
        ]);

        $user = auth()->user();

        $user->customerProfile()->updateOrCreate(
            ['user_id' => $user->id],
            [
                'phone' => $validated['customer_phone'],
                'address_line1' => $validated['address_line1'],
                'address_line2' => $validated['address_line2'] ?? null,
                'city' => $validated['city'],
                'state' => $validated['state'],
                'postcode' => $validated['postcode'],
                'country' => $validated['country'],
            ]
        );


        $subtotalCents = $cart->items->sum(fn($i) => $i->quantity * $i->unit_price_cents);

        $order = Order::create([
            'user_id' => auth()->id(),
            'order_no' => 'ORD-' . strtoupper(Str::random(10)),
            'subtotal_cents' => $subtotalCents,
            'total_cents' => $subtotalCents,
            'status' => 'payment_pending',
            'customer_name' => $validated['customer_name'],
            'customer_phone' => $validated['customer_phone'],
        ]);

        foreach ($cart->items as $item) {
            OrderItem::create([
                'order_id' => $order->id,
                'product_id' => $item->product_id,
                'quantity' => $item->quantity,
                'unit_price_cents' => $item->unit_price_cents,
                'line_total_cents' => $item->quantity * $item->unit_price_cents,
            ]);
        }

        $payment = Payment::create([
            'order_id' => $order->id,
            'provider' => 'fpx',
            'status' => 'initiated',
            'reference' => null,
            'payload' => [
                'note' => 'FPX not integrated yet. Add credentials later in config/fpx.php',
            ],
        ]);

        // Clear cart
        $cart->items()->delete();

        // For now redirect to placeholder "FPX redirect" page/route
        return redirect()->route('payments.fpx.redirect', $order);
    }

    // Placeholder: in real FPX this would generate payload + redirect user to FPX
    public function fpxRedirect(Order $order)
    {
        abort_unless($order->user_id === auth()->id(), 403);

        return view('payments.fpx_redirect', [
            'order' => $order,
            'fpxConfig' => config('fpx'),
        ]);
    }

    // Placeholder callback endpoint
    public function fpxCallback(Request $request)
    {
        // Later: verify signature, update payment + order status
        return response()->json([
            'message' => 'FPX callback received (stub).',
            'data' => $request->all(),
        ]);
    }
}