package rpc

import "bytes"

type Var struct {
	Key   string
	Value string
}

func (v *Var) MarshalBinary() ([]byte, error) {
	var buf bytes.Buffer
	buf.WriteString(v.Key)
	buf.WriteByte(byte(0))
	buf.Write(v.Len()[0:4])
	buf.WriteString(v.Value)
	buf.WriteByte(byte(0))
	return buf.Bytes(), nil
}

func (v *Var) UnmarshalBinary(data []byte) error {
	return nil
}

func (v *Var) Len() (l []byte) {
	/*
		Using a slice instead of [4]byte the wasted 2 bytes are better than the
		more difficult to read read/write calls, and the extra copy operations
		that would be needed anyway, which waste 6 bytes at a time
	*/
	l = make([]byte, 4)
	l[0] = byte((len(v.Value) / 0x1) % 0x100)
	l[1] = byte((len(v.Value) / 0x100) % 0x100)
	l[2] = byte((len(v.Value) / 0x10000) % 0x100)
	l[3] = byte((len(v.Value) / 0x1000000) % 0x100)

	return l
}