lanpartyplayspokemon/frontend/src/TVMode.tsx

import { CSSProperties, useEffect, useMemo, useState } from 'react';
import './TVMode.css';
import { ButtonType, buttonTypeList, WGPPState } from './types';

const TVMode = () => {

  const [state, setState] = useState<Partial<WGPPState>>({});
  const [socket, setSocket] = useState<WebSocket>();

  useEffect(() => {
    const url = new URL(`api/client`, window.location.href);
    url.protocol = url.protocol.replace("http", "ws");
    const sock = new WebSocket(url.href);

    sock.onmessage = (e) => {
      const newState = JSON.parse(e.data) as Partial<WGPPState>;
      // Merge old and new state
      setState(oldState => ({ ...oldState , ...newState }));
    }
    setSocket(sock);

    return () => {
      sock.close();
      setSocket(undefined);
    };
  }, [])

  const totalCount = useMemo(() => buttonTypeList.reduce((acc, v) => (state?.votes?.[v] ?? 0) + acc, 0), [state]);
  const voteList = useMemo(() =>
    buttonTypeList
      .map(b => [b, state?.votes?.[b] ?? 0] as [ButtonType, number])
      //.sort((a, b) => b[1] - a[1])
    , [state]);

  return <div className="stream">
    {state === undefined ?
      <span>Loading...</span> :
      <div>
        <span className={`mode mode-${state.mode}`}>{state.mode}</span>
        <div className="row">
          <div>
            <span>
              next:&nbsp;
            </span>
            <span className={`subtitle mode-${state.nextMode}`}>{state.nextMode}</span>
          </div>
          <span className="timer">{Math.round(state.timeUntilNextMode ?? 0)}s ⏱️</span>
        </div>
        <div className="voting">
          {voteList.flatMap(([b, numVotes], index) => {
            const percentage = numVotes === 0 ? 0 : Math.round(numVotes / totalCount * 100);
            return <div className="vote" style={{ "--vote-percentage": percentage + "%" } as CSSProperties} key={index}>
              <div className="bar-wrap">
              <div className="bar" style={{ "--vote-percentage": percentage + "%" } as CSSProperties} >{b}</div>
              </div>
              <span className="percentage">{percentage === 0 ? "" : `${percentage}%`}</span>
            </div>;
          })}
        </div>
        <div>
          Current state: <pre>
            {JSON.stringify(state, null, 4)}
          </pre>
        </div>

      </div>
    }
  </div>;
}

export default TVMode;