package main

import (
	"fmt"
	"log"

	"maunium.net/go/mautrix"
	"maunium.net/go/mautrix/event"
	"maunium.net/go/mautrix/id"
)

type Dealer struct {
	RoomsList        map[id.RoomID]*Match
	PlayerRooms      map[id.UserID]id.RoomID
	Client           *mautrix.Client
	QueueRoom        id.RoomID
	HomeserverDomain string
}

func (d *Dealer) ConnectToMatrix(homeserver, uname, passwd string) {
	log.Println("Logging into", homeserver, "as", uname)
	client, err := mautrix.NewClient(homeserver, "", "")
	if err != nil {
		panic(err)
	}
	client.Store = NewLazyMemStore("dealer_state")
	_, err = client.Login(&mautrix.ReqLogin{
		Type:             "m.login.password",
		Identifier:       mautrix.UserIdentifier{Type: mautrix.IdentifierTypeUser, User: uname},
		Password:         passwd,
		StoreCredentials: true,
	})
	if err != nil {
		panic(err)
	}
	fmt.Println("Login successful")
	d.Client = client
}

func (d *Dealer) RegisterHandlers() {
	syncer := d.Client.Syncer.(*mautrix.DefaultSyncer)
	syncer.OnEventType(event.StateMember, func(source mautrix.EventSource, evt *event.Event) {
		if evt.Sender == d.Client.UserID {
			return
		}
		if evt.RoomID == d.QueueRoom {
			d.QueueEvent(evt)
			return
		}
		proom, ok := d.PlayerRooms[evt.Sender]
		if ok {
			log.Printf("membership event for player room %v", proom)
			if evt.Content.AsMember().Membership.IsLeaveOrBan() {
				delete(d.PlayerRooms, evt.Sender)
				return
			}
		}
		if evt.Content.AsMember().IsDirect {
			//intention to create player room
			if evt.Content.AsMember().Membership.IsInviteOrJoin() {
				d.PlayerRooms[evt.Sender] = evt.RoomID
				_, err := d.Client.JoinRoomByID(evt.RoomID)
				if err != nil {
					panic(err)
				}
			} else if evt.Content.AsMember().Membership.IsLeaveOrBan() {
				delete(d.PlayerRooms, evt.Sender)
			}
			return
		}
		match, ok := d.RoomsList[evt.RoomID]
		if !ok {
			log.Printf("received membership event for non active game: %v", evt)
			return
		}
		if evt.Sender != match.P1 || evt.Sender != match.P2 || evt.Sender != d.Client.UserID {
			log.Println("membership event for non player")
			return
		}
		gameRoom := d.Client.Store.LoadRoom(evt.RoomID)
		match.JoinOrLeave(gameRoom, evt)
	})
	syncer.OnEventType(event.EventMessage, func(source mautrix.EventSource, evt *event.Event) {
		playerRoom, ok := d.PlayerRooms[evt.Sender]
		if ok {
			log.Printf("received direct message in room %v", playerRoom)
			return
		}
		match, ok := d.RoomsList[evt.RoomID]
		if !ok {
			log.Println("received message event for non active game")
			return
		}
		if !match.IsPlayer(evt.Sender) {
			log.Println("ignoring message event from non player")
			return
		}
		//parse as game command
		resp := match.ParseAction(evt.Content.AsMessage().Body)
		if resp.Private {
			//respond privately
			dm, ok := d.PlayerRooms[evt.Sender]
			if !ok {
				log.Println("tried to send private message to player without room")
				return
			}
			_, err := d.Client.SendText(dm, resp.Body)
			if err != nil {
				panic(err)
			}
		} else {
			_, err := d.Client.SendText(evt.RoomID, resp.Body)
			if err != nil {
				panic(err)
			}
		}

	})
}

func (d *Dealer) SetupRooms(domain string) {
	room := "#tomequeue:" + domain
	// try creating the room first
	res, createErr := d.Client.CreateRoom(&mautrix.ReqCreateRoom{
		Preset:        "public_chat",
		Visibility:    "public",
		RoomAliasName: "tomequeue",
	})
	if createErr != nil {
		//okay let's try joining the room first
		res, err := d.Client.JoinRoom(room, "", nil)
		if err != nil {
			log.Println("unable to create or join queue room")
			log.Printf("Create err: %v", createErr)
			panic(err)
		}
		log.Printf("succesfully joined %v", res.RoomID)
		d.QueueRoom = res.RoomID
		return
	}
	resJoin, err := d.Client.JoinRoomByID(res.RoomID)
	if err != nil {
		log.Println("error joined recently created queue room")
		panic(err)
	}
	log.Printf("succesfully created and joined %v", resJoin.RoomID)
	d.QueueRoom = resJoin.RoomID
	//load player rooms
	joinedResp, err := d.Client.JoinedRooms()
	if err != nil {
		panic(err)
	}
	for _, r := range joinedResp.JoinedRooms {
		tags, err := d.Client.GetTags(r)
		if err != nil {
			continue
		}
		_, ok := tags.Tags["tome_player_room"]
		if !ok {
			continue
		}
		memberListResp, err := d.Client.JoinedMembers(r)
		if err != nil {
			continue
		}
		keys := make([]id.UserID, 0, len(memberListResp.Joined))
		for k := range memberListResp.Joined {
			keys = append(keys, k)
		}
		if len(keys) != 2 {
			log.Printf("tagged player room %v has more then 2 members")
			continue
		}
		for _, k := range keys {
			if k != d.Client.UserID {
				d.PlayerRooms[k] = r
			}
		}

	}
}

func (d *Dealer) NewMatch(p1, p2 id.UserID) *Match {
	//creates a new matrix room for the match
	match := NewMatch()
	roomname := fmt.Sprintf("tome_match_%v", match.ID)
	createRes, err := d.Client.CreateRoom(&mautrix.ReqCreateRoom{
		Preset:        "public",
		RoomAliasName: roomname,
		Invite:        []id.UserID{p1, p2},
	})
	if err != nil {
		log.Println("error creating matrix room for match")
		panic(err)
	}
	match.MatrixRoom = createRes.RoomID
	match.P1 = p1
	match.P2 = p2
	match.Dealer = d.Client.UserID
	d.RoomsList[createRes.RoomID] = match
	return match
}

func (d *Dealer) QueueEvent(evt *event.Event) {
	mem := evt.Content.AsMember()
	if mem.Membership == event.MembershipJoin {
		log.Printf("Player %v has queued", evt.Sender)
		_, ok := d.PlayerRooms[evt.Sender]
		if !ok {
			//open up DM with player
			createRes, err := d.Client.CreateRoom(&mautrix.ReqCreateRoom{
				Preset:   "private_chat",
				Invite:   []id.UserID{evt.Sender},
				IsDirect: true,
			})
			if err != nil {
				log.Println("error creating matrix room for player")
				panic(err)
			}
			d.PlayerRooms[evt.Sender] = createRes.RoomID
			err = d.Client.AddTag(createRes.RoomID, "tome_player_room", 0.0)
			if err != nil {
				panic(err)
			}
		}
	} else if mem.Membership.IsLeaveOrBan() {
		log.Printf("Player %v has dequeued", evt.Sender)
	}
	return
}