mchess-server/server/game.go

package server

import (
	"log"

	"github.com/google/uuid"
)

type Game struct {
	id                uuid.UUID
	players           [2]Player
	currentTurnPlayer Player
}

const (
	PlayerToMove      = 0
	CheckPlayerChange = 1
)

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

	return &game
}

func (game Game) getPlayer1() *Player {
	return &game.players[0]
}

func (game Game) getPlayer2() *Player {
	return &game.players[1]
}

func (game *Game) handle() {
	defer log.Println("Game ", game.id, ": handle() ended")

	<-game.getPlayer1().wsConnEstablished
	log.Println("WS connection for player 1 established")
	<-game.getPlayer2().wsConnEstablished
	log.Println("WS connection for player 2 established")

	gameState := PlayerToMove
	game.currentTurnPlayer = *game.getPlayer1()
	var move *Move
	var receivedMessage []byte

	for {

		switch gameState {
		case PlayerToMove:
			var err error
			_, 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
			}
			move, err = parseMove(string(receivedMessage))
			log.Println("Player ", game.currentTurnPlayer, " moved: ", 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(players [2]Player) {
	log.Printf("Adding players %s and %s to new game", players[0].Uuid.String(), players[1].Uuid.String())

	for i := range players {
		players[i].InGame = true
	}

	game.players = players

	go game.handle()
}