<?php

namespace App\Http\Controllers;

use App\Models\Vendor;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Log;

class VendorProductController extends Controller
{
    /**
     * 新增供貨商品 (Attach)
     */
    public function store(Request $request, Vendor $vendor)
    {
        $validated = $request->validate([
            'product_id' => 'required|exists:products,id',
            'last_price' => 'nullable|numeric|min:0',
        ]);

        // 檢查是否已存在
        if ($vendor->products()->where('product_id', $validated['product_id'])->exists()) {
            return redirect()->back()->with('error', '該商品已在供貨清單中');
        }

        $vendor->products()->attach($validated['product_id'], [
            'last_price' => $validated['last_price'] ?? null
        ]);

        return redirect()->back()->with('success', '供貨商品已新增');
    }

    /**
     * 更新供貨商品資訊 (Update Pivot)
     */
    public function update(Request $request, Vendor $vendor, $productId)
    {
        $validated = $request->validate([
            'last_price' => 'nullable|numeric|min:0',
        ]);

        $vendor->products()->updateExistingPivot($productId, [
            'last_price' => $validated['last_price'] ?? null
        ]);

        return redirect()->back()->with('success', '供貨資訊已更新');
    }

    /**
     * 移除供貨商品 (Detach)
     */
    public function destroy(Vendor $vendor, $productId)
    {
        $vendor->products()->detach($productId);

        return redirect()->back()->with('success', '供貨商品已移除');
    }
}