<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;
use App\Models\Purchase;
use App\Models\Wine;
use Illuminate\Routing\Controller as BaseController;
use Illuminate\Support\Facades\Session;
use Illuminate\Support\Facades\Auth;

class PurchaseController extends BaseController
{
    /**
     * List purchases (simple index)
     */
    public function index()
    {
        $purchases = Purchase::with(['user','items.wine'])->latest()->paginate(20);
        return response()->json($purchases);
    }

    /**
     * Store a new purchase with items.
     *
     * Expected payload:
     * {
     *   user_id: int,
     *   status: string,
     *   items: [ { wine_id: int, quantity: int, unit_price?: decimal }, ... ]
     * }
     */
    public function store(Request $request)
    {
        $data = $request->validate([
            'user_id' => 'required|integer|exists:users,id',
            'status' => 'nullable|string',
            'items' => 'required|array|min:1',
            'items.*.wine_id' => 'required|integer|exists:wines,wine_id',
            'items.*.quantity' => 'required|integer|min:1',
            'items.*.unit_price' => 'nullable|numeric|min:0',
        ]);

        try {
            $purchase = Purchase::createWithItems([
                'user_id' => $data['user_id'],
                'status' => $data['status'] ?? 'pending',
            ], $data['items']);

            return response()->json(['success' => true, 'purchase' => $purchase->load(['items.wine','user'])], 201);
        } catch (\Exception $e) {
            return response()->json(['success' => false, 'message' => $e->getMessage()], 422);
        }
    }

    /**
     * Process checkout from shopping cart
     */
    public function checkout(Request $request)
    {
        $validated = $request->validate([
            'full_name' => 'required|string|max:255',
            'phone' => ['required', 'string', 'max:20', 'regex:/^[\+]?[(]?[0-9]{1,4}[)]?[-\s\.]?[(]?[0-9]{1,4}[)]?[-\s\.]?[0-9]{1,9}$/'],
            'country' => 'required|string|max:100',
            'street' => 'required|string|max:255',
            'city' => 'required|string|max:255',
            'postal_code' => ['required', 'string', 'max:20', 'regex:/^[0-9]{3}\s?[0-9]{2}$/'],
        ], [
            'phone.regex' => 'The phone number format is invalid. Please use format: +420 123 456 789',
            'postal_code.regex' => 'The postal code format is invalid. Please use format: 123 45',
        ]);

        $cart = Session::get('cart', []);

        if (empty($cart)) {
            return redirect()->route('cart.index')->with('error', 'Košík je prázdny.');
        }

        // Prepare items for purchase creation
        $items = [];
        foreach ($cart as $wineId => $cartItem) {
            $wine = Wine::find($wineId);
            if (!$wine) {
                continue;
            }

            // Check stock
            if ($wine->bottles_in_stock < $cartItem['quantity']) {
                return redirect()->route('cart.index')
                    ->with('error', "Nedostatočné množstvo na sklade pre {$wine->wine_name}.");
            }

            $items[] = [
                'wine_id' => $wineId,
                'quantity' => $cartItem['quantity'],
                'unit_price' => $wine->price_per_bottle,
            ];
        }

        try {
            // Create purchase with invoice details in note
            $invoiceNote = "Name: {$validated['full_name']}\n" .
                "Phone: {$validated['phone']}\n" .
                "Street: {$validated['street']}\n" .
                "City: {$validated['city']}\n" .
                "Postal Code: {$validated['postal_code']}\n" .
                "Country: {$validated['country']}";

            $purchase = Purchase::createWithItems([
                'user_id' => Auth::id(),
                'status' => 'completed',
                'note' => $invoiceNote,
                'purchased_at' => now(),
            ], $items);

            // Clear cart after successful purchase
            Session::forget('cart');

            return redirect()->route('purchases.my')
                ->with('success', 'Objednávka bola úspešne vytvorená!');
        } catch (\Exception $e) {
            return redirect()->route('cart.index')
                ->with('error', 'Chyba pri vytváraní objednávky: ' . $e->getMessage());
        }
    }

    /**
     * Display customer's purchase history
     */
    public function myPurchases()
    {
        $purchases = Purchase::with(['items.wine.grapeVariety'])
            ->where('user_id', Auth::id())
            ->orderBy('purchased_at', 'desc')
            ->orderBy('created_at', 'desc')
            ->get();

        return view('purchases.my', compact('purchases'));
    }
}