package ipp

import (
	"encoding/binary"
	"io"
)

type enum struct {
	name  string
	value uint16
}

func NewEnum(name string, value uint16) *enum {
	e := new(enum)
	e.name = name
	e.value = value
	return e
}

func (e enum) String() string {
	return e.name + ":" + string(e.value)
}
func (e *enum) valueTag() tag {
	return enumValueTag
}

func (e *enum) unmarshal(byteStream io.Reader) {
	//e.name, e.value = unmarshalSingleValue(byteStream)

}

func (e *enum) marshal() []byte {
	l := 3 + len(e.name) + 6
	b := make([]byte, l, l)
	p := 0
	b[0] = byte(enumValueTag)
	p += 1
	binary.BigEndian.PutUint16(b[p:p+2], uint16(len(e.name)))
	p += 2
	copy(b[p:], []byte(e.name))
	p += len(e.name)
	binary.BigEndian.PutUint16(b[p:p+2], uint16(4))
	p += 2
	binary.BigEndian.PutUint32(b[p:p+4], uint32(e.value))
	return b
}

func (e *enum) size() int {
	l := 1 + 4 // The attribute tag + 2 lengths
	l += len(e.name)
	l += 4
	return l
}