package chess

import (
	"encoding/json"
	"local/m/mchess_server/api"
	"log"
	"time"

	"github.com/google/uuid"
)

type Game struct {
	id                uuid.UUID
	players           []*Player
	currentTurnPlayer *Player
}

const (
	PlayerToMove      = 0
	CheckPlayerChange = 1
)

func NewGame() *Game {
	var game Game = Game{
		id: uuid.New(),
	}

	return &game
}

func (game Game) GetPlayers() []*Player {
	return game.players
}

func (game Game) GetPlayer1() *Player {
	return game.players[0]
}

func (game Game) GetPlayer2() *Player {
	return game.players[1]
}

func (game *Game) Handle() {
	defer game.killGame()

	ok := game.waitForWebsocketConnections()
	if !ok {
		return
	}

	gameState := PlayerToMove
	game.currentTurnPlayer = game.GetPlayer1()
	var move api.Move
	var receivedMessage []byte
	var err error

	for {

		switch gameState {
		case PlayerToMove:
			_, receivedMessage, err = game.currentTurnPlayer.ReadMessageFromPlayer()
			if err != nil {
				log.Println("Error while reading message:", err)
				// At the moment, we return when there is an error while reading a message.
				// This means, the game just ends uncontrolled
				return
			}
			err = json.Unmarshal(receivedMessage, &move)
			log.Println("Player ", game.currentTurnPlayer, " moved:\n", move)

			if err != nil {
				log.Println("Game: ", game.id, err)
				continue
			}
			gameState = CheckPlayerChange

		case CheckPlayerChange:
			if game.currentTurnPlayer.Uuid == game.players[0].Uuid {
				game.currentTurnPlayer = game.players[1]
			} else {
				game.currentTurnPlayer = game.players[0]
			}

			err := game.GetPlayer1().WriteMessageToPlayer(receivedMessage)
			if err != nil {
				log.Println("Error during message writing:", err)
				continue
			}
			err = game.GetPlayer2().WriteMessageToPlayer(receivedMessage)
			if err != nil {
				log.Println("Error during message writing:", err)
				continue
			}
			gameState = PlayerToMove

		}

		log.Println("GameState = ", gameState)
		if gameState == PlayerToMove {
			log.Println("with player ", game.currentTurnPlayer, " to move")
		}
	}
}

func (game *Game) AddPlayersToGame(player *Player) {
	game.players = append(game.players, player)
}

func (game *Game) killGame() {
	log.Println("Game should be killed")
}

func (game *Game) waitForWebsocketConnections() bool {
	timer := time.NewTimer(5 * time.Second)
	numberOfConnections := 0
	waitingForPlayers := make(chan bool)

	go game.GetPlayer1().WaitForWebsocketConnection(waitingForPlayers)
	go game.GetPlayer2().WaitForWebsocketConnection(waitingForPlayers)

	for numberOfConnections < 2 {
		select {
		case <-waitingForPlayers:
			numberOfConnections++
		case <-timer.C:
			return false
		}
	}
	return true
}