<?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 App\Models\System\Translation;
use App\Traits\ImageHandler;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Storage;
use Illuminate\Support\Str;

class ProductController extends Controller
{
    use \App\Traits\ImageHandler;
    public function index(Request $request)
    {
        $user = auth()->user();
        $query = Product::with(['category', 'translations', 'company']);
        
        // 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);
        
        $companyId = $user->company_id;
        if ($user->isSystemAdmin()) {
            if ($request->filled('company_id')) {
                $companyId = $request->company_id;
                $query->where('company_id', $companyId);
            }
        }

        $products = $query->latest()->paginate($per_page)->withQueryString();
        $categories = ProductCategory::all();
        $companies = $user->isSystemAdmin() ? Company::all() : collect();
        
        // 系統管理員在過濾特定公司時，應顯示該公司的功能開關 (如物料代碼、點數規則)
        $selectedCompany = $companyId ? Company::find($companyId) : $user->company;
        $companySettings = $selectedCompany ? ($selectedCompany->settings ?? []) : [];
        
        $routeName = 'admin.data-config.products.index';

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

    public function create(Request $request)
    {
        $user = auth()->user();
        $categories = ProductCategory::all();
        $companies = $user->isSystemAdmin() ? Company::all() : collect();

        // If system admin, check if company_id is provided in URL to get settings
        $companyId = $request->query('company_id') ?? $user->company_id;
        $selectedCompany = $companyId ? Company::find($companyId) : $user->company;
        $companySettings = $selectedCompany ? ($selectedCompany->settings ?? []) : [];

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

    public function edit($id)
    {
        $user = auth()->user();
        // 繞過 TenantScoped 載入翻譯，確保系統管理員能看到租戶公司的翻譯資料
        $product = Product::with(['company'])->findOrFail($id);
        $product->setRelation('translations', 
            Translation::withoutGlobalScopes()
                ->where('group', 'product')
                ->where('key', $product->name_dictionary_key)
                ->get()
        );
        $categories = ProductCategory::all();
        $companies = $user->isSystemAdmin() ? Company::all() : collect();
        
        // Use the product's company settings for editing
        $companySettings = $product->company ? ($product->company->settings ?? []) : [];

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

    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',
            'company_id' => 'nullable|exists:companies,id',
            'image' => 'nullable|image|mimes:jpeg,png,jpg,gif|max:2048',
        ]);

        try {
            DB::beginTransaction();

            $dictKey = \Illuminate\Support\Str::uuid()->toString();
            // Determine company_id: prioritized from request (for sys admin) then from user
            $company_id = (auth()->user()->isSystemAdmin() && $request->filled('company_id')) 
                ? $request->company_id 
                : auth()->user()->company_id;

            // 儲存多語系翻譯（繞過 TenantScoped，避免系統管理員操作租戶資料時被過濾）
            foreach ($request->names as $locale => $name) {
                if (empty($name)) continue;
                Translation::withoutGlobalScopes()->create([
                    'group' => 'product',
                    'key' => $dictKey,
                    'locale' => $locale,
                    'value' => $name,
                    'company_id' => $company_id,
                ]);
            }


            $imageUrl = null;
            if ($request->hasFile('image')) {
                $path = $this->storeAsWebp($request->file('image'), 'products');
                $imageUrl = Storage::url($path);
            }

            $product = Product::create([
                'company_id' => $company_id,
                'category_id' => $request->category_id,
                'name' => $request->names['zh_TW'] ?? (collect($request->names)->first() ?? 'Untitled'), // Fallback if zh_TW is missing
                'name_dictionary_key' => $dictKey,
                'image_url' => $imageUrl,
                '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()->route('admin.data-config.products.index')->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())->withInput();
        }
    }

    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',
            'image' => 'nullable|image|mimes:jpeg,png,jpg,gif|max:2048',
            'remove_image' => 'nullable|boolean',
        ]);

        try {
            DB::beginTransaction();

            $dictKey = $product->name_dictionary_key ?: \Illuminate\Support\Str::uuid()->toString();
            $company_id = $product->company_id;

            // 更新或建立多語系翻譯（繞過 TenantScoped，避免系統管理員操作租戶資料時被過濾）
            foreach ($request->names as $locale => $name) {
                if (empty($name)) {
                    Translation::withoutGlobalScopes()->where([
                        'group' => 'product',
                        'key' => $dictKey,
                        'locale' => $locale
                    ])->delete();
                    continue;
                }

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

            $data = [
                'category_id' => $request->category_id,
                'name' => $request->names['zh_TW'] ?? ($product->name ?? 'Untitled'),
                '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),
            ];

            if ($request->hasFile('image')) {
                // Delete old image
                if ($product->image_url) {
                    $oldPath = str_replace('/storage/', '', $product->image_url);
                    Storage::disk('public')->delete($oldPath);
                }
                $path = $this->storeAsWebp($request->file('image'), 'products');
                $data['image_url'] = Storage::url($path);
            } elseif ($request->boolean('remove_image')) {
                if ($product->image_url) {
                    $oldPath = str_replace('/storage/', '', $product->image_url);
                    Storage::disk('public')->delete($oldPath);
                }
                $data['image_url'] = null;
            }

            $product->update($data);

            DB::commit();

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

            return redirect()->route('admin.data-config.products.index')->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())->withInput();
        }
    }

    public function toggleStatus($id)
    {
        try {
            $product = Product::findOrFail($id);
            $product->is_active = !$product->is_active;
            $product->save();

            $status = $product->is_active ? __('Enabled') : __('Disabled');
            return redirect()->back()->with('success', __('Product status updated to :status', ['status' => $status]));
        } catch (\Exception $e) {
            return redirect()->back()->with('error', $e->getMessage());
        }
    }

    public function destroy($id)
    {
        try {
            $product = Product::findOrFail($id);
            
            // 刪除與此商品關聯的翻譯資料（繞過 TenantScoped）
            if ($product->name_dictionary_key) {
                Translation::withoutGlobalScopes()->where('key', $product->name_dictionary_key)->delete();
            }

            // Delete image
            if ($product->image_url) {
                $oldPath = str_replace('/storage/', '', $product->image_url);
                Storage::disk('public')->delete($oldPath);
            }

            $product->delete();

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