gomoku/src/messages/draw.ts

import { PlayerConnection } from '../player-connection';
import { broadcastBoard } from '../view/board-renderer';
import { broadcastButtons } from '../view/button-renderer';
import { broadcastSound } from '../view/sound-renderer';
import { broadcastAnimation } from '../view/animation-renderer';
import { broadcastTitle } from '../view/title-renderer';
import { GameServer } from '../game-server';
import { ActionType, Message } from './messages';

export interface DrawMessage extends Message {
  action: ActionType;
}

export function handleDrawMessage(
  server: GameServer,
  conn: PlayerConnection,
  message: DrawMessage,
): void {
  if (server.gomoku.status !== 'playing') {
    conn.sendMessage(
      'error',
      'You can only perform this action in an active game.',
    );
    return;
  }
  switch (message.action) {
    case 'request':
      handleRequestDraw(server, conn);
      break;
    case 'accept':
      if (!server.drawRequesterId) {
        conn.sendMessage('error', 'No draw has been requested.');
        return;
      }
      handleAcceptDraw(server);
      break;
    case 'decline':
      if (!server.drawRequesterId) {
        conn.sendMessage('error', 'No draw has been requested.');
        return;
      }
      handleDeclineDraw(server);
      break;
    case 'cancel':
      if (server.drawRequesterId !== conn.id) {
        conn.sendMessage('error', 'You are not the one who requested a draw.');
        return;
      }
      handleCancelDrawRequest(server);
      break;
  }
}

function handleRequestDraw(server: GameServer, conn: PlayerConnection): void {
  if (server.takebackRequesterId) {
    conn.sendMessage('error', 'A takeback has already been requested.');
    return;
  }

  server.drawRequesterId = conn.id;
  broadcastButtons(server);
}

function handleAcceptDraw(server: GameServer): void {
  server.gomoku.declareDraw();
  server.drawRequesterId = null;
  broadcastBoard(server);
  broadcastButtons(server);
  broadcastTitle(server);
  broadcastSound(server, 'draw');
  broadcastAnimation(server, 'draw');
}

function handleDeclineDraw(server: GameServer): void {
  server.drawRequesterId = null;
  broadcastButtons(server);
}

function handleCancelDrawRequest(server: GameServer): void {
  server.drawRequesterId = null;
  broadcastButtons(server);
}