buzzers/room.js

const chars = require('./characters.json');
const rooms = {};

function shuffle(a) {
  for (let i = a.length - 1; i > 0; i--) {
    const j = Math.floor(Math.random() * (i + 1));
    [a[i], a[j]] = [a[j], a[i]];
  }
  return a;
}

function getOrCreateRoom(roomId) {
  let room = rooms[roomId];
  
  if (!room) {
    room = {
      roomId: roomId,
      participants: [],
      audience: [],
      characters: shuffle(chars),
      canBuzz: true
    };
    rooms[roomId] = room;
  }
  
  return room;
}

function addParticipant(roomId, participantId, participantName) {
  let room = getOrCreateRoom(roomId);
  
  room.participants.push({
    participantId, 
    participantName,
    character: room.characters[room.participants.length],
    active: true
  });
  
  rooms[roomId] = room;
}

function removeParticipant(roomId, participantId) {
  let room = getOrCreateRoom(roomId);
  room.participants.find(p => p.participantId === participantId).active = false;
  room.audience.forEach(ws => {
    ws.send(JSON.stringify({
      type: "participants",
      participants: room.participants
    }));
  });
}

function addParticipantWS(roomId, participantId, ws) {
  let room = getOrCreateRoom(roomId);
  room.participants.find(p => p.participantId === participantId).ws = ws;
  room.audience.forEach(ws => {
    ws.send(JSON.stringify({
      type: "participants",
      participants: room.participants
    }));
  });
}

function addAudienceWS(roomId, ws) {
  let room = getOrCreateRoom(roomId);
  room.audience.push(ws);
  ws.send(JSON.stringify({
    type: "participants",
    participants: room.participants
  }));
}

function buzz(roomId, participant) {
  let room = getOrCreateRoom(roomId);
  if (room.canBuzz) {
    room.canBuzz = false;
    setTimeout(() => room.canBuzz = true, 5000);
    
    participant = room.participants.find(p => p.participantId === participant.participantId);

    room.participants.forEach(p => {
      if (p.ws && p.participantId !== participant.participantId) {
        p.ws.send(JSON.stringify({
          type: "buzz",
          participant: participant.participantName,
          msg: `<img src="${participant.character}"><div>${participant.participantName} buzzed!</div>`
        }));
      }
    });
    room.audience.forEach(ws => {
      ws.send(JSON.stringify({
        type: "buzz",
        participant: participant
      }));
    }); 
  }
}

module.exports = {getOrCreateRoom, addParticipant, addParticipantWS, addAudienceWS, buzz, removeParticipant}