danmu-sim/app/danmu/controls.tsx

"use client";
import { useRef, useState, useEffect, useContext } from "react";
import { query } from "@/lib/actions/lyrics";
import { DanmuContext } from "./provider";

const useLyricsRunner = (runner: (lyric: string) => void, interval: number) => {
  const [lyrics, setLyrics] = useState<string[]>([]);
  const [offset, setOffset] = useState<number>(0);
  const timerRef = useRef<ReturnType<typeof setInterval> | null>(null);
  const startTime = useRef<number>(Date.now());
  const ref = useRef<{ lyrics: string[]; offset: number }>({ lyrics, offset });

  const clearTimer = (): void => {
    if (timerRef.current) {
      clearInterval(timerRef.current);
    }
  };

  const doLyric = (): void => {
    console.log("testing ...", ref.current.lyrics.length);
    if (ref.current.lyrics.length > 0) {
      const currentTime = Date.now() - startTime.current;
      const found = ref.current.lyrics.find((lyric) => {
        const m = Number(lyric.slice(1, 3));
        const s = Number(lyric.slice(4, 6));
        const ms10 = Number(lyric.slice(7, 9));
        const ms = (m * 60 + s) * 1000 + ms10 * 10;
        return (
          currentTime > ms + ref.current.offset &&
          ms + ref.current.offset > currentTime - interval
        );
      });
      if (found) {
        runner(found);
      }
    }
  };

  useEffect(() => {
    ref.current.offset = offset;
    ref.current.lyrics = lyrics;
  }, [offset, lyrics]);

  const start = (): void => {
    clearTimer();
    startTime.current = Date.now();
    timerRef.current = setInterval(doLyric, interval);
  };
  const pause = (): void => {
    clearTimer();
  };
  const resume = (): void => {
    clearTimer();
    timerRef.current = setInterval(doLyric, interval);
  };
  return {
    offset,
    setOffset,
    setLyrics,
    resume,
    start,
    pause,
  };
};

interface LyricItem {
  timestamp: string;
  content: string;
}

export default function Controls(): JSX.Element {
  const ref = useRef<HTMLDialogElement | null>(null);
  const [history, setHistory] = useState<LyricItem[]>([]);
  const { songId, songName, songArtist, listener } = useContext(DanmuContext);

  const { start, resume, pause, setLyrics, offset, setOffset } =
    useLyricsRunner((line) => {
      setHistory((items) => [
        {
          timestamp: line.slice(0, 10),
          content: line.slice(10),
        },
        ...items,
      ]);
      if (listener) {
        // 测试用
        // listener('666');
        // 实际输出歌词
        listener(line.slice(10));
      }
      console.log(line);
    }, 200);

  return (
    <div className="flex justify-center p-4 border-t border-base-300">
      <div className="columns-1">
        <div className="w-full">
          <div className="join">
            <button
              className="btn join-item btn-sm"
              type="button"
              onClick={() => {
                pause();
              }}
            >
              暂停
            </button>
            <button
              className="btn join-item btn-sm"
              type="button"
              onClick={() => {
                resume();
              }}
            >
              恢复
            </button>
            <button
              className="btn join-item btn-sm"
              type="button"
              onClick={() => {
                setOffset(offset + 1000);
              }}
            >
              +1秒
            </button>
            <button
              className="btn join-item btn-sm"
              type="button"
              onClick={() => {
                setOffset(offset - 1000);
              }}
            >
              -1秒
            </button>
            <button
              className="btn join-item btn-sm"
              onClick={() => {
                query({
                  name: songName,
                  artist: songArtist,
                })
                  .then((result) => {
                    // eslint-disable-next-line no-console -- temp
                    console.log(result);

                    if (result) {
                      setLyrics(result.lyrics.split("\n"));
                      setHistory([]);
                      start();
                    }
                  })
                  .catch((err) => {
                    // eslint-disable-next-line no-console -- temp
                    console.error(err);
                  });
              }}
              type="button"
              disabled={!songId}
            >
              开始
            </button>
          </div>
        </div>
        <div
          className="w-full  mt-1 pt-0 pb-1 rounded-xl bg-gray-100 border-t-gray-100"
          role="alert"
        >
          <div className="text-center">当前延迟 {offset / 1000} 秒</div>
        </div>
        <div className="w-full h-[20vh] overflow-auto">
          <ul className="timeline timeline-vertical">
            {history.map((item, i) => (
              <li key={i}>
                <div className="timeline-middle">{item.timestamp}{item.content}</div>
                {/* <div className="timeline-end">
                  <svg
                    xmlns="http://www.w3.org/2000/svg"
                    viewBox="0 0 20 20"
                    fill="currentColor"
                    className="w-5 h-5"
                  >
                    <path
                      fillRule="evenodd"
                      d="M10 18a8 8 0 100-16 8 8 0 000 16zm3.857-9.809a.75.75 0 00-1.214-.882l-3.483 4.79-1.88-1.88a.75.75 0 10-1.06 1.061l2.5 2.5a.75.75 0 001.137-.089l4-5.5z"
                      clipRule="evenodd"
                    />
                  </svg>
                </div> */}
                <hr />
              </li>
            ))}
          </ul>
        </div>
      </div>
    </div>
  );
}