<?php
namespace App\Http\Controllers;

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

class SupplierController extends Controller
{
    /**
     * 供应商列表
     */
    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());
        }

        $query = Supplier::query();
        if ($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(),
        ]);
    }

    /**
     * 供应商详情
     */
    public function show($id)
    {
        $supplier = Supplier::find($id);
        if (!$supplier) {
            return $this->error(404, '供应商不存在');
        }
        return $this->success($supplier);
    }

    /**
     * 创建供应商
     */
    public function store(Request $request)
    {
        $validator = Validator::make($request->all(), [
            'code' => 'required|string|unique:suppliers,code',
            'name' => 'required|string|max:255',
            'contact' => 'nullable|string|max:100',
            'phone' => 'nullable|string|max:20',
            'address' => 'nullable|string|max:500',
            'remark' => 'nullable|string',
        ]);

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

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

    /**
     * 更新供应商
     */
    public function update(Request $request, $id)
    {
        $supplier = Supplier::find($id);
        if (!$supplier) {
            return $this->error(404, '供应商不存在');
        }

        $validator = Validator::make($request->all(), [
            'code' => 'sometimes|string|unique:suppliers,code,' . $id,
            'name' => 'sometimes|string|max:255',
            'contact' => 'nullable|string|max:100',
            'phone' => 'nullable|string|max:20',
            'address' => 'nullable|string|max:500',
            'remark' => 'nullable|string',
        ]);

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

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

    /**
     * 删除供应商
     */
    public function destroy($id)
    {
        $supplier = Supplier::find($id);
        if (!$supplier) {
            return $this->error(404, '供应商不存在');
        }
        $supplier->delete();
        return $this->success(null, '删除成功');
    }

    /**
     * 获取所有供应商（下拉选择）
     */
    public function all()
    {
        $list = Supplier::select('id', 'name', 'code')->get();
        return $this->success($list);
    }

    // 统一响应方法（可放在基类 Controller，这里临时放置）
    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);
    }
}