package constants

import (
	"encoding/json"
	"fmt"
)

type PortType int

const (
	PortTypeTCP PortType = iota
	PortTypeUDP
)

var (
	portTypeID = map[PortType]string{
		PortTypeTCP: "TCP",
		PortTypeUDP: "UDP",
	}

	portTypeName = map[string]PortType{
		"TCP": PortTypeTCP,
		"UDP": PortTypeUDP,
	}
)

func (pt PortType) String() string {
	return portTypeID[pt]
}

func (pt PortType) MarshalJSON() ([]byte, error) {
	value, ok := portTypeID[pt]
	if !ok {
		return nil, fmt.Errorf("Invalid EnumType[%s] value", pt)
	}
	return json.Marshal(value)
}

func (pt PortType) UnmarshalJSON(b []byte) error {
	var s string
	err := json.Unmarshal(b, &s)
	if err != nil {
		return err
	}

	value, ok := portTypeName[s]
	if !ok {
		return fmt.Errorf("Invalid EnumType[%s] value", s)
	}
	pt = value
	return nil
}