package chat

import (
	"bytes"
	"errors"
	"io"
	"strconv"

	"github.com/Tnze/go-mc/nbt"
	pk "github.com/Tnze/go-mc/net/packet"
)

// ReadFrom decode Message in a Text component
func (m *Message) ReadFrom(r io.Reader) (int64, error) {
	return pk.NBT(m).ReadFrom(r)
}

// WriteTo encode Message into a Text component
func (m Message) WriteTo(w io.Writer) (int64, error) {
	return pk.NBT(&m).WriteTo(w)
}

func (m Message) TagType() byte {
	return nbt.TagCompound
}

func (m Message) MarshalNBT(w io.Writer) error {
	if m.Translate != "" {
		return nbt.NewEncoder(w).Encode(translateMsg(m), "")
	} else {
		return nbt.NewEncoder(w).Encode(rawMsgStruct(m), "")
	}
}

func (m *Message) UnmarshalNBT(tagType byte, r nbt.DecoderReader) error {
	// Re-combine the tagType into the reader, and create a nbt decoder
	tagReader := bytes.NewReader([]byte{tagType})
	decoder := nbt.NewDecoder(io.MultiReader(tagReader, r))
	decoder.NetworkFormat(true) // TagType directlly followed the body

	switch tagType {
	case nbt.TagString:
		_, err := decoder.Decode(&m.Text)
		return err
	case nbt.TagCompound:
		_, err := decoder.Decode((*rawMsgStruct)(m))
		return err
	case nbt.TagList:
		_, err := decoder.Decode(&m.Extra)
		return err
	default:
		return errors.New("unknown chat message type: '" + strconv.FormatUint(uint64(tagType), 16) + "'")
	}
}