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package nctalk

import (
	"context"
	"strconv"

	"github.com/42wim/matterbridge/bridge"
	"github.com/42wim/matterbridge/bridge/config"

	talk "gomod.garykim.dev/nc-talk"
	"gomod.garykim.dev/nc-talk/ocs"
	"gomod.garykim.dev/nc-talk/room"
	"gomod.garykim.dev/nc-talk/user"
)

type Btalk struct {
	user  *user.TalkUser
	rooms []Broom
	*bridge.Config
}

func New(cfg *bridge.Config) bridge.Bridger {
	return &Btalk{Config: cfg}
}

type Broom struct {
	room      *room.TalkRoom
	ctx       context.Context
	ctxCancel context.CancelFunc
}

func (b *Btalk) Connect() error {
	b.Log.Info("Connecting")
	b.user = talk.NewUser(b.GetString("Server"), b.GetString("Login"), b.GetString("Password"))
	_, err := b.user.Capabilities()
	if err != nil {
		b.Log.Error("Cannot Connect")
		return err
	}
	b.Log.Info("Connected")
	return nil
}

func (b *Btalk) Disconnect() error {
	for _, r := range b.rooms {
		r.ctxCancel()
	}
	return nil
}

func (b *Btalk) JoinChannel(channel config.ChannelInfo) error {
	newRoom := Broom{
		room: talk.NewRoom(b.user, channel.Name),
	}
	newRoom.ctx, newRoom.ctxCancel = context.WithCancel(context.Background())
	c, err := newRoom.room.ReceiveMessages(newRoom.ctx)
	if err != nil {
		return err
	}
	b.rooms = append(b.rooms, newRoom)
	go func() {
		for msg := range c {
			// ignore messages that are one of the following
			// * not a message from a user
			// * from ourselves
			if msg.MessageType != ocs.MessageComment || msg.ActorID == b.user.User {
				continue
			}
			remoteMessage := config.Message{
				Text:     msg.Message,
				Channel:  newRoom.room.Token,
				Username: msg.ActorDisplayName,
				UserID:   msg.ActorID,
				Account:  b.Account,
			}
			// It is possible for the ID to not be set on older versions of Talk so we only set it if
			// the ID is not blank
			if msg.ID != 0 {
				remoteMessage.ID = strconv.Itoa(msg.ID)
			}
			b.Log.Debugf("<= Message is %#v", remoteMessage)
			b.Remote <- remoteMessage
		}
	}()
	return nil
}

func (b *Btalk) Send(msg config.Message) (string, error) {
	r := b.getRoom(msg.Channel)
	if r == nil {
		b.Log.Errorf("Could not find room for %v", msg.Channel)
		return "", nil
	}

	// Talk currently only supports sending normal messages
	if msg.Event != "" {
		return "", nil
	}
	sentMessage, err := r.room.SendMessage(msg.Username + msg.Text)
	if err != nil {
		b.Log.Errorf("Could not send message to room %v from %v: %v", msg.Channel, msg.Username, err)
		return "", nil
	}
	return strconv.Itoa(sentMessage.ID), nil
}

func (b *Btalk) getRoom(token string) *Broom {
	for _, r := range b.rooms {
		if r.room.Token == token {
			return &r
		}
	}
	return nil
}