package websocket

import (
	"github.com/gorilla/websocket"
	"github.com/thesyncim/faye/message"
	"github.com/thesyncim/faye/transport"
	"strconv"
	"sync/atomic"
)

const transportName = "websocket"

func init() {
	transport.RegisterTransport(&Websocket{})
}

type Websocket struct {
	TransportOpts *transport.Options
	conn          *websocket.Conn
	clientID      string
	msgID         *uint64
}

var _ transport.Transport = (*Websocket)(nil)

func (w *Websocket) Init(options *transport.Options) error {
	var (
		err   error
		msgID uint64
	)

	w.TransportOpts = options
	w.msgID = &msgID
	w.conn, _, err = websocket.DefaultDialer.Dial(options.Url, nil)
	if err != nil {
		return err
	}
	return nil
}
func (w *Websocket) Name() string {
	return transportName
}
func (w *Websocket) nextMsgID() string {
	return strconv.Itoa(int(atomic.AddUint64(w.msgID, 1)))
}

func (w *Websocket) Options() *transport.Options {
	return w.TransportOpts
}
func (w *Websocket) Handshake() (err error) {
	if err = w.conn.WriteJSON(append(nil, message.Message{
		Channel:                  string(transport.Handshake),
		Version:                  "1.0", //todo const
		SupportedConnectionTypes: []string{transportName},
	})); err != nil {
		return err
	}

	var hsResps []message.Message
	if err = w.conn.ReadJSON(hsResps); err != nil {
		return err
	}

	resp := hsResps[0]
	if resp.GetError() != nil {
		return err
	}
	w.clientID = resp.ClientId
	return nil
}

func (w *Websocket) Connect() error {
	//todo verify if extensions are applied on connect,verify if hs is complete
	return w.conn.WriteJSON(append(nil, message.Message{
		Channel:        string(transport.Connect),
		ClientId:       w.clientID,
		ConnectionType: transportName,
		Id:             w.nextMsgID(),
	}))
}

func (w *Websocket) Subscribe(subscription string, onMessage func(message *message.Message)) error {
	panic("not implemented")
}

func (w *Websocket) Unsubscribe(subscription string) error {
	panic("not implemented")
}

func (w *Websocket) Publish(subscription string, message *message.Message) error {
	panic("not implemented")
}