package botlib

import (
	"fmt"
	"log"
	"os"

	"maunium.net/go/mautrix"
)

type Config struct {
	Userid string
	Server string
	Token  string
	Name   string
	Owner  string
	Prefix string
}

type Bot struct {
	Client           *mautrix.Client
	Rooms            map[string]int
	Conf             *Config
	ManagementRoomID string
}

func NewBot(c *Config) *Bot {
	client, err := mautrix.NewClient(c.Server, c.Userid, c.Token)
	if err != nil {
		log.Fatal(err)
	}
	b := &Bot{Client: client, Rooms: make(map[string]int), Conf: c, ManagementRoomID: "!fxioaRvcDbKKhCpHrZ:saintnet.tech"}
	return b
}

func (b *Bot) LeaveEmptyRooms() error {
	resp, err := b.Client.JoinedRooms()
	if err != nil {
		return err
	}
	for _, v := range resp.JoinedRooms {

		mem, err := b.Client.JoinedMembers(v)
		if err != nil {
			return err
		}
		if len(mem.Joined) > 1 {
			b.Rooms[v] = len(mem.Joined)
			log.Printf("%v is in Room %v\n", b.Conf.Name, v)
		} else {
			_, err := b.Client.LeaveRoom(v)
			if err != nil {
				return err
			}
			_, err = b.Client.ForgetRoom(v)
			if err != nil {
				return err
			}
			log.Printf("%v was in Room %v, left due to being last one there\n", b.Conf.Name, v)
		}

	}
	return nil
}

func (b *Bot) CreateManagementRoom() (string, error) {
	if b.ManagementRoomID != "" {
		log.Printf("%v already has management room %v\n", b.Conf.Name, b.ManagementRoomID)
		return "b.ManagementRoomID", nil
	}
	log.Printf("Creating Management Room for %v\n", b.Conf.Name)
	respCreateRoom, err := b.Client.CreateRoom(&mautrix.ReqCreateRoom{
		Preset:     "trusted_private_chat",
		Visibility: "private",
		Name:       fmt.Sprintf("%v Control Room", b.Conf.Name),
		Invite:     []string{b.Conf.Owner},
		IsDirect:   true,
	})
	b.ManagementRoomID = respCreateRoom.RoomID
	if err != nil {
		return "", err
	} else {
		log.Printf("%v created management room %v\n", b.Conf.Name, respCreateRoom.RoomID)
		return respCreateRoom.RoomID, nil
	}
}

func (b *Bot) DefaultHandleMessage(e *mautrix.Event) {
	if e.Sender == b.Conf.Userid {
		return //we don't care about our own messages
	}
	body := e.Content.Body
	if body == "stop" {
		b.Client.SendText(e.RoomID, "Shutting down...")
		b.Client.StopSync()
		os.Exit(0)
	}

	_, err := b.Client.SendText(e.RoomID, body)
	if err != nil {
		log.Fatal(err)
	}
}

func (b *Bot) DefaultHandleMember(e *mautrix.Event) {
	mbr := e.Content.Membership
	if mbr == mautrix.MembershipInvite {
		if e.Sender == b.Conf.Owner && e.GetStateKey() == b.Conf.Userid {
			log.Printf("%v joining room: %v\n", b.Conf.Name, e.RoomID)
			_, err := b.Client.JoinRoom(e.RoomID, "", nil)
			if err != nil {
				log.Fatal(err)
			}

		}
	}
	if mbr == mautrix.MembershipJoin {
		log.Printf("A user joined a room %v cares about\n", b.Conf.Name)
		b.Rooms[e.RoomID] = b.Rooms[e.RoomID] + 1
	}
	if mbr == mautrix.MembershipLeave && e.Sender != b.Conf.Userid {
		b.Rooms[e.RoomID] = b.Rooms[e.RoomID] - 1
		if b.Rooms[e.RoomID] < 2 {
			log.Printf("%v is last in a room, leaving.\n", b.Conf.Name)
			_, err := b.Client.LeaveRoom(e.RoomID)
			if err != nil {
				log.Fatal(err)
			}
			_, err = b.Client.ForgetRoom(e.RoomID)
			if err != nil {
				log.Fatal(err)
			}
		}
	}
}