<?php

namespace App\Http\Requests\Product;

use App\Models\ProductCategoryModel;
use App\Models\SupplierModel;
use Closure;
use Illuminate\Validation\Rules\Exists;
use Illuminate\Validation\Validator;
use Modules\Common\Http\Requests\BaseFormRequest;
use Modules\SystemTool\Models\SysFileModel;

/**
 * 商品档案 创建/编辑 验证（售价按客户等级上浮比例换算，不再维护等级价格行）
 */
class ProductFormRequest extends BaseFormRequest
{
    protected $stopOnFirstFailure = true;

    public function rules(): array
    {
        return [
            'category_id' => ['required','integer', new Exists(ProductCategoryModel::class,'id')],
            'supplier_id' => ['nullable','integer', 'exclude_if:supplier_id,0', new Exists(SupplierModel::class,'id')],
            'market' => 'nullable|string|max:50',
            'name' => 'required|string|max:100',
            'spec' => 'nullable|string|max:100',
            'unit' => 'nullable|string|max:20',
            'image_ids' => 'nullable|array|max:255',
            'image_ids.*' => ['integer', new Exists(SysFileModel::class, 'id')],
            'content' => 'nullable|string',
            'sort' => 'nullable|integer',
            'shelf_life' => 'nullable|integer|min:0',
            'stock' => 'nullable|integer|min:0',
            'status' => 'nullable|integer|in:0,1',
            'cost_price' => 'nullable|numeric|min:0|max:99999999',
            'remark' => 'nullable|string|max:255',
        ];
    }

    /**
     * 交叉校验：商品只能挂在末级分类
     * （Laravel 12 FormRequest 的 after() 需返回单个 Closure，由容器 call 后注册到 Validator）
     */
    public function after(): Closure
    {
        return function (Validator $validator): void {
            $data = (array) $validator->getData();
            $categoryId = (int) ($data['category_id'] ?? 0);
            if ($categoryId > 0 && ProductCategoryModel::where('parent_id', $categoryId)->exists()) {
                $validator->errors()->add('category_id', '该分类下存在子分类，请选择末级分类');
            }
        };
    }

    public function messages(): array
    {
        return [
            'name.required' => '商品名称不能为空',
            'name.max' => '商品名称最长 100 个字符',
            'category_id.required' => '请选择商品分类',
            'category_id.exists' => '商品分类不存在',
            'supplier_id.exists' => '供应商不存在',
            'status.in' => '状态值不正确',
            'cost_price.numeric' => '成本价必须为数字',
            'cost_price.min' => '成本价不能小于 0',
        ];
    }
}