<?php

namespace App\Http\Controllers\Admin\Manage;

use App\Http\Controllers\Controller;
use App\Http\Requests\Admin\Manage\Purchase\AddToCartRequest;
use App\Models\PurchaseItem;
use Illuminate\Http\RedirectResponse;

class PurchaseCartController extends Controller
{
    public function addToCart(AddToCartRequest $request): RedirectResponse
    {
        $validated = $request->validated();

        $item = PurchaseItem::where('user_id', auth()->id())
            ->whereNull('purchase_id')
            ->where('product_id', $validated['product_id'])
            ->first();

        if ($item) {
            $newQuantity = $item->quantity + $validated['quantity'];

            if ($newQuantity <= 0) {
                $item->delete();
            } else {
                $item->update([
                    'quantity' => $newQuantity,
                    'total_price' => $newQuantity * $item->unit_price,
                ]);
            }
        } else {
            if ($validated['quantity'] > 0) {
                PurchaseItem::create([
                    'user_id' => auth()->id(),
                    'purchase_id' => null,
                    'product_id' => $validated['product_id'],
                    'quantity' => $validated['quantity'],
                    'unit_price' => $validated['unit_price'],
                    'total_price' => $validated['quantity'] * $validated['unit_price'],
                ]);
            }
        }

        return redirect()->back();
    }

    public function removeFromCart(PurchaseItem $purchaseItem): RedirectResponse
    {
        if ($purchaseItem->user_id === auth()->id() && $purchaseItem->purchase_id === null) {
            $purchaseItem->delete();
        }

        return redirect()->back();
    }

    public function updateCartItem(AddToCartRequest $request, PurchaseItem $purchaseItem): RedirectResponse
    {
        if ($purchaseItem->user_id !== auth()->id() || $purchaseItem->purchase_id !== null) {
            return redirect()->back();
        }

        $validated = $request->validated();

        $purchaseItem->update([
            'quantity' => $validated['quantity'],
            'total_price' => $validated['quantity'] * $purchaseItem->unit_price,
        ]);

        return redirect()->back();
    }
}