package telegram

import (
	"strconv"

	"dev.narayana.im/narayana/telegabber/xmpp/gateway"

	log "github.com/sirupsen/logrus"
	"github.com/zelenin/go-tdlib/client"
)

func uhOh() {
	log.Fatal("Update type mismatch")
}

func (c *Client) updateHandler() {
	listener := c.client.GetListener()
	defer listener.Close()

	for update := range listener.Updates {
		if update.GetClass() == client.ClassUpdate {
			switch update.GetType() {
			case client.TypeUpdateUser:
				typedUpdate, ok := update.(*client.UpdateUser)
				if !ok {
					uhOh()
				}
				c.updateUser(typedUpdate)
			case client.TypeUpdateUserStatus:
				typedUpdate, ok := update.(*client.UpdateUserStatus)
				if !ok {
					uhOh()
				}
				c.updateUserStatus(typedUpdate)
			case client.TypeUpdateNewChat:
				typedUpdate, ok := update.(*client.UpdateNewChat)
				if !ok {
					uhOh()
				}
				c.updateNewChat(typedUpdate)
			default:
				// log only handled types
				continue
			}

			log.Debugf("%#v", update)
		}
	}
}

func (c *Client) updateUser(update *client.UpdateUser) {
	cache.users[update.User.Id] = update.User
	show, status := userStatusToText(update.User.Status)
	c.processStatusUpdate(update.User.Id, status, show)
}

func (c *Client) updateUserStatus(update *client.UpdateUserStatus) {
	show, status := userStatusToText(update.Status)
	c.processStatusUpdate(update.UserId, status, show, gateway.SPImmed(false))
}

func (c *Client) updateNewChat(update *client.UpdateNewChat) {
	if update.Chat != nil && update.Chat.Photo != nil && update.Chat.Photo.Small != nil {
		_, err := c.client.DownloadFile(&client.DownloadFileRequest{
			FileId:      update.Chat.Photo.Small.Id,
			Priority:    32,
			Synchronous: true,
		})

		if err != nil {
			log.Error("Failed to download the chat photo")
		}
	}

	cache.chats[update.Chat.Id] = update.Chat

	var isChannel = false
	if update.Chat.Type.ChatTypeType() == client.TypeChatTypeSupergroup {
		typeSupergroup, ok := update.Chat.Type.(*client.ChatTypeSupergroup)
		if !ok {
			uhOh()
		}
		isChannel = typeSupergroup.IsChannel
	}

	if !(isChannel && update.Chat.LastReadInboxMessageId == 0) {
		gateway.SendPresence(
			c.xmpp,
			c.jid,
			gateway.SPFrom(strconv.Itoa(int(update.Chat.Id))),
			gateway.SPType("subscribe"),
			gateway.SPNickname(update.Chat.Title),
		)
	}

	if update.Chat.Id < 0 {
		c.processStatusUpdate(int32(update.Chat.Id), update.Chat.Title, "chat")
	}
}