<?php

namespace App\Http\Requests\Product;

use App\Models\ProductCategoryModel;
use App\Models\ProductPriceModel;
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（含多等级价格 prices 数组）
 */
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')],
            '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',
            'prices' => 'nullable|array',
            'prices.*.level_id' => 'required|integer|exists:customer_level,id',
            'prices.*.price_type' => 'nullable|integer|in:0,1',
            'prices.*.price' => 'required|numeric|min:0|max:99999999',
            'prices.*.percent' => 'nullable|numeric|min:0|max:999.99',
        ];
    }

    /**
     * 交叉校验：商品只能挂在末级分类；按成本百分比计价（price_type=1）时上浮百分点必填
     * （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()) {
                $validator->errors()->add('category_id', '该分类下存在子分类，请选择末级分类');
            }
            foreach ((array) ($data['prices'] ?? []) as $index => $row) {
                $priceType = (int) ($row['price_type'] ?? ProductPriceModel::PRICE_TYPE_FIXED);
                if ($priceType === ProductPriceModel::PRICE_TYPE_PERCENT
                    && (! array_key_exists('percent', (array) $row) || $row['percent'] === null || $row['percent'] === '')) {
                    $validator->errors()->add("prices.{$index}.percent", '按成本百分比计价时必须填写上浮百分点');
                }
            }
        };
    }

    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',
            'prices.*.level_id.required' => '价格行缺少客户等级',
            'prices.*.level_id.exists' => '客户等级不存在',
            'prices.*.price.required' => '价格行缺少单价',
            'prices.*.price.numeric' => '单价必须为数字',
            'prices.*.price.min' => '单价不能小于 0',
            'cost_price.numeric' => '成本价必须为数字',
            'cost_price.min' => '成本价不能小于 0',
            'prices.*.price_type.in' => '计价类型不正确',
            'prices.*.percent.numeric' => '上浮百分点必须为数字',
            'prices.*.percent.min' => '上浮百分点不能小于 0',
            'prices.*.percent.max' => '上浮百分点不能超过 999.99',
        ];
    }
}