package errors

import "fmt"

// AppError 是应用错误结构
type AppError struct {
	Code       string // OPS_{CATEGORY}_{CODE}
	HTTPStatus int
	Message    string
	Detail     map[string]any
}

func (e *AppError) Error() string {
	return fmt.Sprintf("[%s] %s", e.Code, e.Message)
}

// 预定义错误
var (
	ErrBadRequest      = &AppError{Code: "OPS_GEN_4001", HTTPStatus: 400, Message: "请求参数错误"}
	ErrUnauthorized    = &AppError{Code: "OPS_GEN_4002", HTTPStatus: 401, Message: "未授权"}
	ErrForbidden       = &AppError{Code: "OPS_GEN_4003", HTTPStatus: 403, Message: "权限不足"}
	ErrNotFound        = &AppError{Code: "OPS_GEN_4004", HTTPStatus: 404, Message: "资源不存在"}
	ErrConflict        = &AppError{Code: "OPS_GEN_4005", HTTPStatus: 409, Message: "资源冲突"}
	ErrPayloadTooLarge = &AppError{Code: "OPS_GEN_4006", HTTPStatus: 413, Message: "请求体过大"}
	ErrInternal        = &AppError{Code: "OPS_GEN_5001", HTTPStatus: 500, Message: "内部服务错误"}

	ErrInvalidMetricName = &AppError{Code: "OPS_MET_4001", HTTPStatus: 400, Message: "指标名称无效"}
	ErrInvalidTimeRange  = &AppError{Code: "OPS_MET_4002", HTTPStatus: 400, Message: "时间范围不合法"}
)

// WithDetail 为错误添加详细信息
func (e *AppError) WithDetail(detail map[string]any) *AppError {
	return &AppError{
		Code:       e.Code,
		HTTPStatus: e.HTTPStatus,
		Message:    e.Message,
		Detail:     detail,
	}
}

// Wrap 包裹原始错误
func Wrap(err error, appErr *AppError) *AppError {
	if err == nil {
		return nil
	}
	return &AppError{
		Code:       appErr.Code,
		HTTPStatus: appErr.HTTPStatus,
		Message:    fmt.Sprintf("%s: %v", appErr.Message, err),
		Detail:     appErr.Detail,
	}
}