ws = new WebSocket("ws://localhost:8080");
const div = document.querySelector("#shiritori");
const input = document.querySelector("#shiritori-input");
const players = document.querySelector("#shiritori-players");
let id = null;

function displayWord(_word, end) {
  let { word, reading } = _word;
  p = document.createElement("p");
  p.innerHTML = reading || word === reading ? (word === "" ? reading : `<ruby>${word}<rp>(</rp><rt>${reading}<rt/><rp>)</rp></ruby>`) : word;
  if (end) {
    div.append(p);
  } else {
    div.prepend(p);
  }
  div.scrollTop = div.offsetHeight;
}

ws.onmessage = e => {
  const { event, data } = JSON.parse(e.data);
  switch (event) {
    case "greeting":
      id = data.id;
      break;
    case "word":
      let waiting = data.author === id;
      displayWord(data.word, true);
      input.placeholder = waiting ? "Waiting for other players..." : `${data.next_char}…`;
      input.disabled = waiting;
      if (!waiting) input.focus();
      break;
    case "history":
      console.log(data);
      data.words.forEach(word => {
        displayWord(word, false);
      })
      break;
    case "playerCount":
      let otherPlayers = data.players - 1;
      players.innerHTML = `${otherPlayers === 0 ? "No" : otherPlayers} other player${otherPlayers === 1 ? "" : "s"} online.`;
      break;
    case "error":
      alert(data.message);
      break;
  }
}

input.addEventListener('keypress', e => {
  if (e.key === 'Enter') {
    ws.send(input.value);
    input.value = "";
  }
});