<?php
namespace App\Http\Controllers;

use App\Models\Brand;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Validator;

class BrandController extends Controller
{
    public function index(Request $request)
    {
        $validator = Validator::make($request->all(), [
            'page' => 'integer|min:1',
            'limit' => 'integer|min:1|max:100',
            'name' => 'string|nullable',
        ]);

        if ($validator->fails()) {
            return $this->error(422, '参数错误', $validator->errors());
        }

        $query = Brand::query();
        if ($request->filled('name')) {
            $query->where('name', 'like', "%{$request->name}%");
        }

        $list = $query->paginate($request->input('limit', 10));
        return $this->success([
            'list' => $list->items(),
            'total' => $list->total(),
            'current_page' => $list->currentPage(),
            'last_page' => $list->lastPage(),
        ]);
    }

    public function show($id)
    {
        $brand = Brand::find($id);
        if (!$brand) {
            return $this->error(404, '品牌不存在');
        }
        return $this->success($brand);
    }

    public function store(Request $request)
    {
        $validator = Validator::make($request->all(), [
            'code' => 'required|string|unique:brands,code',
            'name' => 'required|string|max:255',
            'remark' => 'nullable|string',
        ]);

        if ($validator->fails()) {
            return $this->error(422, '参数错误', $validator->errors());
        }

        $brand = Brand::create($request->all());
        return $this->success($brand, '创建成功', 201);
    }

    public function update(Request $request, $id)
    {
        $brand = Brand::find($id);
        if (!$brand) {
            return $this->error(404, '品牌不存在');
        }

        $validator = Validator::make($request->all(), [
            'code' => 'sometimes|string|unique:brands,code,' . $id,
            'name' => 'sometimes|string|max:255',
            'remark' => 'nullable|string',
        ]);

        if ($validator->fails()) {
            return $this->error(422, '参数错误', $validator->errors());
        }

        $brand->update($request->all());
        return $this->success($brand, '更新成功');
    }

    public function destroy($id)
    {
        $brand = Brand::find($id);
        if (!$brand) {
            return $this->error(404, '品牌不存在');
        }
        $brand->delete();
        return $this->success(null, '删除成功');
    }

    public function all()
    {
        $list = Brand::select('id', 'name', 'code')->get();
        return $this->success($list);
    }

    private function success($data = null, $message = 'success', $code = 200)
    {
        return response()->json([
            'code' => $code,
            'data' => $data,
            'message' => $message
        ], $code);
    }

    private function error($code, $message, $errors = null)
    {
        $response = ['code' => $code, 'message' => $message];
        if ($errors) $response['errors'] = $errors;
        return response()->json($response, $code);
    }
}