package handlers

import (
	"context"
	"errors"
	"fmt"
	"gralias/broker"
	"gralias/llmapi"
	"gralias/models"
	"gralias/wordloader"
)

func createRoom(ctx context.Context, req *models.RoomReq) (*models.Room, error) {
	creator, ok := ctx.Value(models.CtxUsernameKey).(string)
	if !ok {
		err := errors.New("failed to extract user from ctx")
		return nil, err
	}
	room := req.CreateRoom(creator)
	room.RoomLink = cfg.BaseURL + "/room-join?id=" + room.ID
	if err := repo.RoomCreate(ctx, room); err != nil {
		return nil, err
	}
	return room, nil
}

func saveFullInfo(ctx context.Context, fi *models.FullInfo) error {
	// INFO: no transactions; so case is possible where first object is updated but the second is not
	if err := repo.PlayerUpdate(ctx, fi.State); err != nil {
		return err
	}
	log.Debug("saved user state", "state", fi.State)
	// save or update
	// fi.Room.Cards
	// fi.Room.WCMap
	if err := repo.RoomUpdate(ctx, fi.Room); err != nil {
		return err
	}
	return nil
}

func notifyBotIfNeeded(room *models.Room) {
	if botName := room.WhichBotToMove(); botName != "" {
		log.Debug("got botname", "name", botName, "channel_len", len(llmapi.SignalChanMap[botName]))
		llmapi.SignalChanMap[botName] <- true
		log.Debug("after sending signal", "name", botName)
	}
}

// cache

// func saveState(username string, state *models.UserState) error {
// 	key := models.CacheStatePrefix + username
// 	data, err := json.Marshal(state)
// 	if err != nil {
// 		return err
// 	}
// 	memcache.Set(key, data)
// 	return nil
// }

// func getAllNames() []string {
// 	names := []string{}
// 	// will not scale
// 	session := &models.Session{}
// 	// filter by key size only sessions
// 	for _, name := range wholeMemStore {
// 		// xid is 20 in len
// 		if len(k) != 20 {
// 			continue
// 		}
// 		if err := json.Unmarshal(v, &session); err != nil {
// 			log.Error("failed to unmarshal", "error", err)
// 			continue
// 		}
// 		names = append(names, session.Username)
// 	}
// 	return names
// }

// can room exists without state? I think no
func getFullInfoByCtx(ctx context.Context) (*models.FullInfo, error) {
	resp := &models.FullInfo{}
	// state, err := getStateByCtx(ctx)
	state, err := getPlayerByCtx(ctx)
	if err != nil {
		return nil, err
	}
	resp.State = state
	if state.RoomID == nil || *state.RoomID == "" {
		log.Debug("returning state without room", "username", state.Username)
		return resp, nil
	}
	// room, err := getRoomByID(state.RoomID)
	room, err := repo.RoomGetExtended(ctx, *state.RoomID)
	// room, err := repo.RoomGetByID(ctx, *state.RoomID)
	if err != nil {
		// room was deleted; remove it from player;
		log.Warn("failed to find room despite knowing room_id;",
			"room_id", state.RoomID)
		state.Team = models.UserTeamNone
		state.Role = models.UserRoleNone
		if err := repo.PlayerExitRoom(ctx, state.Username); err != nil {
			log.Warn("failed to exit room",
				"room_id", state.RoomID, "username", state.Username)
			return resp, err
		}
		return nil, err
	}
	resp.Room = room
	return resp, nil
}

func getPlayerByCtx(ctx context.Context) (*models.Player, error) {
	username, ok := ctx.Value(models.CtxUsernameKey).(string)
	if !ok {
		log.Debug("no username in ctx")
		return &models.Player{}, errors.New("no username in ctx")
	}
	return repo.PlayerGetByName(ctx, username)
}

// // DEPRECATED
// func leaveRole(fi *models.FullInfo) {
// 	fi.Room.RedTeam.Guessers = utils.RemoveFromSlice(fi.State.Username, fi.Room.RedTeam.Guessers)
// 	fi.Room.BlueTeam.Guessers = utils.RemoveFromSlice(fi.State.Username, fi.Room.BlueTeam.Guessers)
// 	if fi.Room.RedTeam.Mime == fi.State.Username {
// 		fi.Room.RedTeam.Mime = ""
// 	}
// 	if fi.Room.BlueTeam.Mime == fi.State.Username {
// 		fi.Room.BlueTeam.Mime = ""
// 	}
// }

func joinTeam(ctx context.Context, role, team string) (*models.FullInfo, error) {
	// get username
	fi, _ := getFullInfoByCtx(ctx)
	fi.Room.RemovePlayer(fi.State.Username)
	// get room
	if role == "mime" {
		if team == "blue" {
			if fi.Room.BlueTeam.Mime != "" {
				// error: alredy taken
				err := errors.New("Mime role already taken!")
				return fi, err
			}
			fi.Room.BlueTeam.Mime = fi.State.Username
			fi.Room.BlueTeam.Color = "blue"
			fi.State.Team = "blue"
			fi.State.Role = "mime"
		} else if team == "red" {
			if fi.Room.RedTeam.Mime != "" {
				// error: alredy taken
				err := errors.New("Mime role already taken!")
				return fi, err
			}
			fi.Room.RedTeam.Mime = fi.State.Username
			fi.Room.RedTeam.Color = "red"
			fi.State.Team = "red"
			fi.State.Role = "mime"
		} else {
			err := errors.New("uknown team:" + team)
			return nil, err
		}
	} else if role == "guesser" {
		if team == "blue" {
			fi.Room.BlueTeam.Guessers = append(fi.Room.BlueTeam.Guessers, fi.State.Username)
			fi.Room.BlueTeam.Color = "blue"
			fi.State.Team = "blue"
			fi.State.Role = "guesser"
		} else if team == "red" {
			fi.Room.RedTeam.Guessers = append(fi.Room.RedTeam.Guessers, fi.State.Username)
			fi.Room.RedTeam.Color = "red"
			fi.State.Team = "red"
			fi.State.Role = "guesser"
		} else {
			err := errors.New("uknown team:" + team)
			return nil, err
		}
	} else {
		err := errors.New("uknown role:" + role)
		return nil, err
	}
	if err := saveFullInfo(ctx, fi); err != nil {
		return nil, err
	}
	return fi, nil
}

// get all rooms
// func listRooms(allRooms bool) []*models.Room {
// 	cacheMap := memcache.GetAll()
// 	publicRooms := []*models.Room{}
// 	// no way to know if room is public until unmarshal -_-;
// 	for key, value := range cacheMap {
// 		if strings.HasPrefix(key, models.CacheRoomPrefix) {
// 			room := &models.Room{}
// 			if err := json.Unmarshal(value, &room); err != nil {
// 				log.Warn("failed to unmarshal room", "error", err)
// 				continue
// 			}
// 			if room.IsPublic || allRooms {
// 				publicRooms = append(publicRooms, room)
// 			}
// 		}
// 	}
// 	return publicRooms
// }

// get bots
func listBots() []models.Player {
	bots, err := repo.PlayerList(context.Background(), true)
	if err != nil {
		log.Error("failed to fetch bots from db", "error", err)
	}
	return bots
}

// get players
func notify(event, msg string) {
	Notifier.Notifier <- broker.NotificationEvent{
		EventName: event,
		Payload:   msg,
	}
}

func loadCards(room *models.Room) {
	// store it somewhere
	wordMap := map[string]string{
		"en": "assets/words/en_nouns.txt",
		"ru": "assets/words/ru_nouns.txt",
	}
	wl := wordloader.InitDefaultLoader(wordMap[room.Settings.Language])
	cards, err := wl.Load()
	if err != nil {
		// no logger
		fmt.Println("failed to load cards", "error", err)
	}
	room.Cards = cards
	room.WCMap = make(map[string]models.WordColor)
	for _, card := range room.Cards {
		room.WCMap[card.Word] = card.Color
	}
}

func recoverBots() {
	bots := listBots()
	for _, bot := range bots {
		if err := recoverBot(bot); err != nil {
			log.Warn("failed to recover bot", "botName", bot.Username, "error", err)
		}
	}
}

func recoverBot(bm models.Player) error {
	// check if room still exists
	if bm.RoomID == nil {
		return errors.New("bot has no room id")
	}
	if _, err := repo.RoomGetByID(context.Background(), *bm.RoomID); err != nil {
		return fmt.Errorf("no such room: %s; err: %w", *bm.RoomID, err)
	}
	log.Debug("recovering bot", "bot", bm)
	_, err := llmapi.NewBot(string(bm.Role), string(bm.Team), bm.Username, *bm.RoomID, cfg, true)
	if err != nil {
		return err
	}
	return nil
}

// func recoverPlayers() {
// 	players := listPlayers()
// 	for playerName, playerMap := range players {
// 		if err := recoverPlayer(playerMap); err != nil {
// 			log.Warn("failed to recover player", "playerName", playerName, "error", err)
// 		}
// 	}
// }

// func recoverPlayer(pm map[string]string) error {
// 	// check if room still exists
// 	room, err := repo.RoomGetByID(context.Background(), pm["RoomID"])
// 	if err != nil {
// 		return fmt.Errorf("no such room: %s; err: %w", pm["RoomID"], err)
// 	}
// 	log.Debug("recovering player", "player", pm)
// 	role, team, ok := room.GetPlayerByName(pm["Username"])
// 	if !ok {
// 		return fmt.Errorf("failed to find player %s in the room %v", pm["Username"], room)
// 	}
// 	us := &models.Player{
// 		Username: pm["Username"],
// 		RoomID:   pm["RoomID"],
// 		Team:     team,
// 		Role:     role,
// 	}
// 	return saveState(pm["Username"], us)
// }

// validateMove checks if it is players turn
func validateMove(fi *models.FullInfo, ur models.UserRole) error {
	if fi.State.Role != ur {
		err := fmt.Errorf("need to be %s to make that action", ur)
		return err
	}
	// whos move it is?
	if fi.State.Team != models.UserTeam(fi.Room.TeamTurn) {
		err := errors.New("not your team's move")
		return err
	}
	switch ur {
	case models.UserRoleGuesser:
		if !fi.Room.MimeDone {
			err := errors.New("wait for the mime to give a clue")
			return err
		}
	case models.UserRoleMime:
		if fi.Room.MimeDone {
			err := errors.New("clue was already given")
			return err
		}
	default:
		return fmt.Errorf("uknown user role: %s", ur)
	}
	return nil
}