package commonservice

// AppError 是带稳定错误码与 HTTP 状态的业务错误，控制器原样返回 {"error":"CODE"}。
type AppError struct {
	Code   string
	Status int
}

func (e *AppError) Error() string {
	if e == nil {
		return ""
	}
	return e.Code
}

// AsAppError 从 error 中取出 AppError；非业务错误返回 false。
func AsAppError(err error) (*AppError, bool) {
	if err == nil {
		return nil, false
	}
	if ae, ok := err.(*AppError); ok {
		return ae, true
	}
	return nil, false
}

func BadRequest(code string) *AppError   { return &AppError{Code: code, Status: 400} }
func Unauthorized(code string) *AppError { return &AppError{Code: code, Status: 401} }
func Forbidden(code string) *AppError    { return &AppError{Code: code, Status: 403} }
func NotFound(code string) *AppError     { return &AppError{Code: code, Status: 404} }
func Conflict(code string) *AppError     { return &AppError{Code: code, Status: 409} }
func Internal(code string) *AppError     { return &AppError{Code: code, Status: 500} }