<?php

namespace App\Http\Controllers;

use App\Models\Material;
use App\Models\Product;
use Illuminate\Http\Request;

class CartController extends Controller
{
    public function index()
    {
        $cart = session()->get('cart', []);
        $subtotal = 0;

        foreach ($cart as $item) {
            $subtotal += $item['price'] * $item['quantity'];
        }

        $shipping = $subtotal > 50 || empty($cart) ? 0.00 : 4.95;
        $total = $subtotal + $shipping;

        return view('cart.index', compact('cart', 'subtotal', 'shipping', 'total'));
    }

    public function add(Request $request)
    {
        $validated = $request->validate([
            'product_id' => 'required|exists:products,id',
            'material' => 'required|string',
            'color' => 'required|string',
            'scale' => 'nullable|string',
            'infill' => 'nullable|string',
            'quantity' => 'required|integer|min:1|max:50',
        ]);

        $product = Product::findOrFail($validated['product_id']);
        $material = Material::where('code', $validated['material'])->first();

        // Prijs berekening inclusief materiaal vermenigvuldiger & schaal
        $unitPrice = $product->base_price;
        if ($material) {
            $unitPrice *= $material->price_multiplier;
        }

        // Schaal aanpassing
        $scale = $validated['scale'] ?? '100%';
        if ($scale === '150%') {
            $unitPrice *= 1.45;
        } elseif ($scale === '200%') {
            $unitPrice *= 1.95;
        }

        $unitPrice = round($unitPrice, 2);

        // Unieke sleutel in sessie op basis van product + configuratie
        $cartKey = md5($product->id.'_'.$validated['material'].'_'.$validated['color'].'_'.$scale);

        $cart = session()->get('cart', []);

        if (isset($cart[$cartKey])) {
            $cart[$cartKey]['quantity'] += (int) $validated['quantity'];
        } else {
            $cart[$cartKey] = [
                'id' => $product->id,
                'name' => $product->name,
                'slug' => $product->slug,
                'image_url' => $product->image_url,
                'material' => $material ? $material->name : $validated['material'],
                'material_code' => $validated['material'],
                'color' => $validated['color'],
                'scale' => $scale,
                'infill' => $validated['infill'] ?? 'Standaard (20%)',
                'price' => $unitPrice,
                'quantity' => (int) $validated['quantity'],
            ];
        }

        session()->put('cart', $cart);

        if ($request->wantsJson()) {
            return response()->json([
                'success' => true,
                'message' => 'Artikel toegevoegd aan je winkelwagen!',
                'cartCount' => array_sum(array_column($cart, 'quantity')),
            ]);
        }

        return redirect()->route('cart.index')->with('success', "{$product->name} is toegevoegd aan je winkelwagen!");
    }

    public function addCustom(Request $request)
    {
        $validated = $request->validate([
            'model_name' => 'nullable|string|max:255',
            'model_url' => 'nullable|url|max:1000',
            'model_file' => 'nullable|file|extensions:stl,3mf,obj,step,stp,zip|max:51200', // 50MB
            'size' => 'required|in:klein,medium,groot',
            'material' => 'required|string',
            'color' => 'required|string',
            'infill' => 'nullable|string',
            'notes' => 'nullable|string|max:1000',
            'quantity' => 'required|integer|min:1|max:20',
        ]);

        if (! $request->hasFile('model_file') && empty($validated['model_url'])) {
            return back()->withInput()->with('error', 'Upload een 3D-bestand (.stl, .3mf, .obj, .step) of vul een MakerWorld/Printables link in.');
        }

        $filePath = null;
        $originalName = null;
        if ($request->hasFile('model_file')) {
            $file = $request->file('model_file');
            $originalName = $file->getClientOriginalName();
            $filePath = $file->store('custom_models', 'public');
        }

        $material = Material::where('code', $validated['material'])->first();

        // Basisprijs op basis van formaat
        $sizePrices = [
            'klein' => 9.95,   // tot 8 cm
            'medium' => 16.95, // tot 15 cm
            'groot' => 24.95,  // tot 22 cm
        ];
        $unitPrice = $sizePrices[$validated['size']] ?? 16.95;

        if ($material) {
            $unitPrice *= $material->price_multiplier;
        }

        $unitPrice = round($unitPrice, 2);

        $name = ! empty($validated['model_name'])
            ? $validated['model_name']
            : ($originalName ?: 'Eigen 3D Model');

        $cartKey = md5('custom_'.($filePath ?: ($validated['model_url'] ?? '')).'_'.$validated['material'].'_'.$validated['color'].'_'.$validated['size']);

        $cart = session()->get('cart', []);

        $cart[$cartKey] = [
            'id' => null,
            'is_custom' => true,
            'name' => 'Custom Print: '.$name,
            'slug' => 'custom-3d-print',
            'image_url' => 'https://images.unsplash.com/photo-1581092160607-ee22621dd758?auto=format&fit=crop&w=400&q=80',
            'material' => $material ? $material->name : $validated['material'],
            'material_code' => $validated['material'],
            'color' => $validated['color'],
            'scale' => ucfirst($validated['size']),
            'infill' => $validated['infill'] ?? 'Standaard (20%)',
            'price' => $unitPrice,
            'quantity' => (int) $validated['quantity'],
            'custom_file_path' => $filePath,
            'custom_file_name' => $originalName,
            'custom_model_url' => $validated['model_url'] ?? null,
            'custom_notes' => $validated['notes'] ?? null,
        ];

        session()->put('cart', $cart);

        return redirect()->route('cart.index')->with('success', "Jouw eigen 3D model '{$name}' is direct toegevoegd aan je winkelwagen!");
    }

    public function update(Request $request)
    {
        $validated = $request->validate([
            'key' => 'required|string',
            'quantity' => 'required|integer|min:1|max:50',
        ]);

        $cart = session()->get('cart', []);

        if (isset($cart[$validated['key']])) {
            $cart[$validated['key']]['quantity'] = (int) $validated['quantity'];
            session()->put('cart', $cart);
        }

        return redirect()->route('cart.index')->with('success', 'Winkelwagen bijgewerkt.');
    }

    public function remove($key)
    {
        $cart = session()->get('cart', []);

        if (isset($cart[$key])) {
            unset($cart[$key]);
            session()->put('cart', $cart);
        }

        return redirect()->route('cart.index')->with('success', 'Artikel verwijderd uit je winkelwagen.');
    }

    public function count()
    {
        $cart = session()->get('cart', []);
        $totalItems = array_sum(array_column($cart, 'quantity'));

        return response()->json(['count' => $totalItems]);
    }
}