<?php

namespace App\Http\Controllers\Admin;

use App\Http\Controllers\Controller;
use App\Models\Product\Product;
use App\Models\Product\ProductCategory;
use App\Models\System\Company;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Str;

class ProductController extends Controller
{
    public function index(Request $request)
    {
        $user = auth()->user();
        $query = Product::with(['category', 'translations', 'company']);
        
        // 租戶隔離由 Global Scope (TenantScoped) 處理，但系統管理員可額外篩選
        if ($user->isSystemAdmin() && $request->filled('company_id')) {
            $query->where('company_id', $request->company_id);
        }

        // 搜尋
        if ($request->filled('search')) {
            $search = $request->search;
            $query->where(function($q) use ($search) {
                $q->where('name', 'like', "%{$search}%")
                  ->orWhere('barcode', 'like', "%{$search}%")
                  ->orWhere('spec', 'like', "%{$search}%");
            });
        }

        // 分類篩選
        if ($request->filled('category_id')) {
            $query->where('category_id', $request->category_id);
        }

        $per_page = $request->input('per_page', 10);
        $products = $query->latest()->paginate($per_page)->withQueryString();
        $categories = ProductCategory::all();
        $companies = $user->isSystemAdmin() ? Company::all() : collect();
        
        $companySettings = $user->company ? ($user->company->settings ?? []) : [];
        $routeName = 'admin.data-config.products.index';

        return view('admin.products.index', [
            'products' => $products,
            'categories' => $categories,
            'companies' => $companies,
            'companySettings' => $companySettings,
            'routeName' => $routeName
        ]);
    }

    public function store(Request $request)
    {
        $validated = $request->validate([
            'names.zh_TW' => 'required|string|max:255',
            'names.en' => 'nullable|string|max:255',
            'names.ja' => 'nullable|string|max:255',
            'barcode' => 'nullable|string|max:100',
            'spec' => 'nullable|string|max:255',
            'category_id' => 'nullable|exists:product_categories,id',
            'manufacturer' => 'nullable|string|max:255',
            'track_limit' => 'required|integer|min:1',
            'spring_limit' => 'required|integer|min:1',
            'price' => 'required|numeric|min:0',
            'cost' => 'required|numeric|min:0',
            'member_price' => 'required|numeric|min:0',
            'metadata' => 'nullable|array',
            'is_active' => 'nullable|boolean',
        ]);

        try {
            DB::beginTransaction();

            $dictKey = (string) Str::uuid();
            $company_id = auth()->user()->company_id;

            // Store translations
            foreach ($request->names as $locale => $name) {
                if (empty($name)) continue;
                Translation::create([
                    'group' => 'product',
                    'key' => $dictKey,
                    'locale' => $locale,
                    'text' => $name,
                    'company_id' => $company_id,
                ]);
            }

            $product = Product::create([
                'company_id' => $company_id,
                'category_id' => $request->category_id,
                'name' => $request->names['zh_TW'], // Default name uses zh_TW
                'name_dictionary_key' => $dictKey,
                'barcode' => $request->barcode,
                'spec' => $request->spec,
                'manufacturer' => $request->manufacturer,
                'track_limit' => $request->track_limit,
                'spring_limit' => $request->spring_limit,
                'price' => $request->price,
                'cost' => $request->cost,
                'member_price' => $request->member_price,
                'metadata' => $request->metadata ?? [],
                'is_active' => $request->boolean('is_active', true),
            ]);

            DB::commit();

            if ($request->wantsJson()) {
                return response()->json([
                    'success' => true,
                    'message' => __('Product created successfully'),
                    'data' => $product
                ]);
            }

            return redirect()->back()->with('success', __('Product created successfully'));

        } catch (\Exception $e) {
            DB::rollBack();
            if ($request->wantsJson()) {
                return response()->json(['success' => false, 'message' => $e->getMessage()], 500);
            }
            return redirect()->back()->with('error', $e->getMessage());
        }
    }

    public function update(Request $request, $id)
    {
        $product = Product::findOrFail($id);

        $validated = $request->validate([
            'names.zh_TW' => 'required|string|max:255',
            'names.en' => 'nullable|string|max:255',
            'names.ja' => 'nullable|string|max:255',
            'barcode' => 'nullable|string|max:100',
            'spec' => 'nullable|string|max:255',
            'category_id' => 'nullable|exists:product_categories,id',
            'manufacturer' => 'nullable|string|max:255',
            'track_limit' => 'required|integer|min:1',
            'spring_limit' => 'required|integer|min:1',
            'price' => 'required|numeric|min:0',
            'cost' => 'required|numeric|min:0',
            'member_price' => 'required|numeric|min:0',
            'metadata' => 'nullable|array',
            'is_active' => 'nullable|boolean',
        ]);

        try {
            DB::beginTransaction();

            $dictKey = $product->name_dictionary_key;
            $company_id = auth()->user()->company_id;

            // Update or Create translations
            foreach ($request->names as $locale => $name) {
                if (empty($name)) {
                    Translation::where([
                        'group' => 'product',
                        'key' => $dictKey,
                        'locale' => $locale
                    ])->delete();
                    continue;
                }

                Translation::updateOrCreate(
                    [
                        'group' => 'product',
                        'key' => $dictKey,
                        'locale' => $locale,
                    ],
                    [
                        'text' => $name,
                        'company_id' => $company_id,
                    ]
                );
            }

            $product->update([
                'category_id' => $request->category_id,
                'name' => $request->names['zh_TW'],
                'barcode' => $request->barcode,
                'spec' => $request->spec,
                'manufacturer' => $request->manufacturer,
                'track_limit' => $request->track_limit,
                'spring_limit' => $request->spring_limit,
                'price' => $request->price,
                'cost' => $request->cost,
                'member_price' => $request->member_price,
                'metadata' => $request->metadata ?? [],
                'is_active' => $request->boolean('is_active', true),
            ]);

            DB::commit();

            if ($request->wantsJson()) {
                return response()->json([
                    'success' => true,
                    'message' => __('Product updated successfully'),
                    'data' => $product
                ]);
            }

            return redirect()->back()->with('success', __('Product updated successfully'));

        } catch (\Exception $e) {
            DB::rollBack();
            if ($request->wantsJson()) {
                return response()->json(['success' => false, 'message' => $e->getMessage()], 500);
            }
            return redirect()->back()->with('error', $e->getMessage());
        }
    }

    public function destroy($id)
    {
        try {
            $product = Product::findOrFail($id);
            
            // Delete translations associated with this product
            if ($product->name_dictionary_key) {
                Translation::where('key', $product->name_dictionary_key)->delete();
            }

            $product->delete();

            return redirect()->back()->with('success', __('Product deleted successfully'));
        } catch (\Exception $e) {
            return redirect()->back()->with('error', $e->getMessage());
        }
    }
}