package utils

import (
	"errors"
	"strings"

	"github.com/gin-gonic/gin"
	"github.com/go-playground/validator/v10"
	"psi/models/response"
)

// HandleValidationError 处理验证错误并返回自定义JSON响应
// 将 validator 的验证错误转换为友好的中文提示
func HandleValidationError(c *gin.Context, err error) {
	if err == nil {
		return
	}

	// 如果是 validator.ValidationErrors 类型
	var validationErrors validator.ValidationErrors
	if errors.As(err, &validationErrors) {
		// 提取所有验证错误信息
		errorMessages := make([]string, 0, len(validationErrors))
		for _, e := range validationErrors {
			errorMessages = append(errorMessages, formatValidationError(e))
		}

		// 返回第一个错误信息（或者可以返回所有错误）
		msg := strings.Join(errorMessages, "; ")
		response.FailWithValidateMessage(msg, c)
		return
	}

	// 其他类型的错误，直接返回错误信息
	response.FailWithValidateMessage("参数错误: "+err.Error(), c)
}

// formatValidationError 格式化单个验证错误为友好的中文提示
func formatValidationError(e validator.FieldError) string {
	field := e.Field()
	tag := e.Tag()
	param := e.Param()

	switch tag {
	case "required":
		return getFieldChineseName(field) + "不能为空"

	case "min":
		kind := e.Kind().String()
		if kind == "slice" || kind == "array" {
			return getFieldChineseName(field) + "至少需要" + param + "个元素"
		}
		return getFieldChineseName(field) + "最小值为" + param

	case "max":
		kind := e.Kind().String()
		if kind == "slice" || kind == "array" {
			return getFieldChineseName(field) + "最多只能有" + param + "个元素"
		}
		return getFieldChineseName(field) + "最大值为" + param

	case "email":
		return getFieldChineseName(field) + "邮箱格式不正确"

	case "url":
		return getFieldChineseName(field) + "URL格式不正确"

	case "numeric":
		return getFieldChineseName(field) + "必须是数字"

	case "alpha":
		return getFieldChineseName(field) + "只能是字母"

	case "alphanum":
		return getFieldChineseName(field) + "只能是字母和数字"

	case "oneof":
		return getFieldChineseName(field) + "必须是以下值之一: " + param

	case "gt":
		return getFieldChineseName(field) + "必须大于" + param

	case "gte":
		return getFieldChineseName(field) + "必须大于等于" + param

	case "lt":
		return getFieldChineseName(field) + "必须小于" + param

	case "lte":
		return getFieldChineseName(field) + "必须小于等于" + param

	case "len":
		kind := e.Kind().String()
		if kind == "slice" || kind == "array" {
			return getFieldChineseName(field) + "必须有" + param + "个元素"
		}
		return getFieldChineseName(field) + "长度必须为" + param

	case "ne":
		return getFieldChineseName(field) + "不能等于" + param

	case "eq":
		return getFieldChineseName(field) + "必须等于" + param

	case "contains":
		return getFieldChineseName(field) + "必须包含" + param

	case "excludes":
		return getFieldChineseName(field) + "不能包含" + param

	case "startswith":
		return getFieldChineseName(field) + "必须以" + param + "开头"

	case "endswith":
		return getFieldChineseName(field) + "必须以" + param + "结尾"

	default:
		return getFieldChineseName(field) + "验证失败"
	}
}

// getFieldChineseName 获取字段的中文名称映射
func getFieldChineseName(field string) string {
	fieldMap := map[string]string{
		//Barcode 相关
		"Content": "条形码内容",

		// Book 相关
		"Isbn":            "ISBN",
		"BookName":        "书名",
		"Author":          "作者",
		"Publisher":       "出版社",
		"PublicationTime": "出版时间",
		"BindingLayout":   "装帧方式",
		"FixPrice":        "定价",

		// Car 相关
		"Appearance": "品相",
		"PushType":   "推送类型",

		// Employee 相关
		"Username":      "账号",
		"Password":      "密码",
		"EmpId":         "员工ID",
		"Level":         "等级",
		"PayTime":       "支付时间",
		"OperationType": "操作类型",
		"ExpireTime":    "过期时间",

		// Inventory 相关
		"ProductID":    "商品ID",
		"StockCheckID": "盘库ID",

		// Location 相关
		"WarehouseID": "仓库ID",
		"Code":        "编码",
		"Type":        "类型",
		"Capacity":    "容量",
		"Status":      "状态",

		// Process  相关
		"CarID":              "小车ID",
		"CarCode":            "小车编号",
		"Quantity":           "数量",
		"UnitPrice":          "单价",
		"WaveID":             "波次ID",
		"RelatedOrderID":     "关联订单ID",
		"WaveNo":             "波次号",
		"Operator":           "操作人",
		"OperatorID":         "操作人ID",
		"ReceivingOrderID":   "入库单ID",
		"WaveTaskID":         "波次任务ID",
		"AssociationOrderID": "关联平台订单ID",
		"AssociationOrderNo": "关联平台订单号",
		"OutboundOrderID":    "出库单ID",
		"ShippingOrderID":    "发货单ID",
		"SalesOrderItemID":   "销售单明细ID",
		"LogisticsCompany":   "物流公司",
		"LogisticsNo":        "物流运单号",
		"OrderID":            "订单ID",
		"LocationID":         "货位ID",
		"AdjustType":         "调整类型",
		"SalesOrderID":       "销售订单ID",

		// Product 相关
		"CategoryID":  "分类ID",
		"ProductName": "商品名称",
		"Barcode":     "条形码",
		"Price":       "单价",
		"UserID":      "用户ID",
		"SalePrice":   "售价",
		"OutTaskID":   "外部任务ID",

		// Warehouse 相关
		"Name":          "名称",
		"ContactPerson": "联系人",
		"ContactPhone":  "联系电话",
		"Province":      "省份",
		"City":          "城市",
		"District":      "区县",
		"Address":       "详细地址",

		// 通用字段
		"Page":     "页码",
		"PageSize": "每页数量",
		"Keyword":  "关键词",
		"ID":       "ID",
	}

	if chineseName, ok := fieldMap[field]; ok {
		return chineseName
	}

	// 如果没有映射，返回原字段名
	return field
}