package domain

import "fmt"

type ErrorCode uint8

const (
	ErrorCodeUnknown ErrorCode = iota
	ErrorCodeValidation
	ErrorCodeIO // External I/O error such as network failure.
)

func (e ErrorCode) String() string {
	switch e {
	case ErrorCodeValidation:
		return "validation-error"
	case ErrorCodeIO:
		return "io-error"
	case ErrorCodeUnknown:
		fallthrough
	default:
		return "internal-server-error"
	}
}

type Error struct {
	code ErrorCode
	msg  string
	err  error
}

type ErrorOption func(err Error) Error

func WithCode(code ErrorCode) ErrorOption {
	return func(err Error) Error {
		err.code = code
		return err
	}
}

func WithErr(wrap error) ErrorOption {
	return func(err Error) Error {
		err.err = wrap
		return err
	}
}

func WithMessage(msg string) ErrorOption {
	return func(err Error) Error {
		err.msg = msg
		return err
	}
}

func WithMessagef(format string, a ...any) ErrorOption {
	return func(err Error) Error {
		err.msg = fmt.Sprintf(format, a...)
		return err
	}
}

func NewError(opts ...ErrorOption) Error {
	var err Error
	for _, opt := range opts {
		err = opt(err)
	}
	return err
}

func (err Error) Error() string {
	if err.err != nil {
		return err.msg + ": " + err.err.Error()
	}

	return err.msg
}

func (err Error) Message() string {
	return err.msg
}

func (err Error) Code() ErrorCode {
	return err.code
}

func (err Error) Unwrap() error {
	return err.err
}