package ipp

import (
	"encoding/binary"
)

type keyWord struct {
	name   string
	values []string
}

func newKeyWord() *keyWord {
	k := new(keyWord)
	k.values = make([]string, 0)
	return k
}

func (k keyWord) String() string {
	r := k.name + " :"
	for _, v := range k.values {
		r = r + " " + v
	}
	return r
}
func (k *keyWord) valueTag() tag {
	return keyWordValueTag
}

// func (k *keyWord) unmarshal(byteStream io.Reader) {
// 	if len(k.values) == 0 {
// 		var v string
// 		k.name, v = unmarshalSingleValue(byteStream)
// 		k.values = append(k.values, v)
// 	} else {
// 		var v string
// 		_, v = unmarshalSingleValue(byteStream)
// 		k.values = append(k.values, v)
// 	}
// }

func (k *keyWord) marshal() []byte {
	l := 5 + len(k.name) + len(k.values[0])
	for i := range k.values[1:] {
		l += 5 + len(k.values[i+1])
	}
	res := make([]byte, 0, l)
	p := 0
	res[p] = byte(keyWordValueTag)
	p += 1
	binary.BigEndian.PutUint16(res[p:p+2], uint16(len(k.name)))
	p += 2
	copy(res[p:], []byte(k.name))
	p += len(k.name)
	binary.BigEndian.PutUint16(res[p:p+2], uint16(len(k.values[0])))
	p += 2
	copy(res[p:], []byte(k.values[0]))
	p += len(k.values[0])
	for i := range k.values[1:] {
		res[p] = byte(keyWordValueTag)
		p += 1
		binary.BigEndian.PutUint16(res[p:p+2], uint16(0))
		p = p + 2
		binary.BigEndian.PutUint16(res[p:p+2], uint16(len(k.values[i+1])))
		p = p + 2
		copy(res[p:], []byte(k.values[i+1]))
		p += len(k.values[i+1])
	}

	return []byte{}
}

func (k *keyWord) addValue(v string) {
	k.values = append(k.values, v)
}

func (k *keyWord) size() int {
	l := 1 + 2 // The value tag (0x44) + name-length field (2 bytes)
	l += len(k.name)
	l += 2 // value-length field (2 bytes)
	l += len(k.values[0])
	// Add all additional values
	for _, v := range k.values[1:] {
		l += 1 + 4 // The value tag (0x44) + 2 length fields (2 bytes)
		l += len(v)
	}
	return l
}