Wave Timeline

import {  useState,  useEffect,  useRef,  memo,  type ReactElement,  type RefObject,} from "react";import WaveSurfer, {  type WaveSurferEvents,  type WaveSurferOptions,} from "wavesurfer.js";type WavesurferEventHandler<T extends unknown[]> = (  wavesurfer: WaveSurfer,  ...args: T) => void;type OnWavesurferEvents = {  [K in keyof WaveSurferEvents as `on${Capitalize<K>}`]?: WavesurferEventHandler<    WaveSurferEvents[K]  >;};type PartialWavesurferOptions = Omit<WaveSurferOptions, "container">;export type WavesurferProps = PartialWavesurferOptions &  OnWavesurferEvents & {    className?: string;  };export const WAVESURFER_DEFAULTS = {  waveColor: "var(--muted-foreground)",  progressColor: "var(--primary)",  height: 64,  barWidth: 3,  barGap: 2,  barRadius: 2,  minPxPerSec: 1,  cursorWidth: 0,} as const satisfies Partial<WaveSurferOptions>;const EVENT_PROP_RE = /^on([A-Z])/;const isEventProp = (key: string) => EVENT_PROP_RE.test(key);const getEventName = (key: string) =>  key.replace(EVENT_PROP_RE, (_, $1) =>    $1.toLowerCase(),  ) as keyof WaveSurferEvents;// ─── Component ───────────────────────────────────────────────────────────────const WavesurferPlayer = memo(  (props: WavesurferProps): ReactElement => {    const containerRef = useRef<HTMLDivElement | null>(null);    const wsRef = useRef<WaveSurfer | null>(null);    const { className, ...rest } = props;    // ── Separate options from event handlers    const options: Partial<WaveSurferOptions> = {};    const eventProps: OnWavesurferEvents = {};    for (const key in rest) {      if (isEventProp(key))        eventProps[key as keyof OnWavesurferEvents] = rest[          key as keyof typeof rest        ] as never;      else        options[key as keyof PartialWavesurferOptions] = rest[          key as keyof typeof rest        ] as never;    }    // ── Resolve CSS vars    const waveColor =      (options.waveColor as string | undefined) ??      WAVESURFER_DEFAULTS.waveColor;    const progressColor =      (options.progressColor as string | undefined) ??      WAVESURFER_DEFAULTS.progressColor;    const resolvedWaveColor = useCssVar(waveColor);    const resolvedProgressColor = useCssVar(progressColor);    // ── Keep event handlers in a ref — changes never cause re-subscription    const eventsRef = useRef(eventProps);    eventsRef.current = eventProps;    // ── Keep non-url options in a ref — changes applied imperatively    const optionsRef = useRef(options);    optionsRef.current = options;    // ── Create instance only when url or structural options change    const url = options.url as string | undefined;    const height =      (options.height as number | undefined) ?? WAVESURFER_DEFAULTS.height;    const barWidth =      (options.barWidth as number | undefined) ?? WAVESURFER_DEFAULTS.barWidth;    const barGap =      (options.barGap as number | undefined) ?? WAVESURFER_DEFAULTS.barGap;    const barRadius =      (options.barRadius as number | undefined) ??      WAVESURFER_DEFAULTS.barRadius;    const minPxPerSec =      (options.minPxPerSec as number | undefined) ??      WAVESURFER_DEFAULTS.minPxPerSec;    const cursorWidth =      (options.cursorWidth as number | undefined) ??      WAVESURFER_DEFAULTS.cursorWidth;    const dragToSeek = options.dragToSeek as boolean | undefined;    const media = options.media as HTMLMediaElement | undefined;    useEffect(() => {      if (!containerRef.current) return;      const ws = WaveSurfer.create({        ...WAVESURFER_DEFAULTS,        url,        height,        barWidth,        barGap,        barRadius,        minPxPerSec,        cursorWidth,        dragToSeek,        media,        plugins: optionsRef.current.plugins,        waveColor: resolvedWaveColor,        progressColor: resolvedProgressColor,        container: containerRef.current,      });      wsRef.current = ws;      // Subscribe to all events via ref — always calls latest handler      const eventEntries = Object.keys(eventsRef.current);      const unsubs = eventEntries.map((name) => {        const event = getEventName(name);        return ws.on(event, (...args) =>          (            eventsRef.current[              name as keyof OnWavesurferEvents            ] as WavesurferEventHandler<WaveSurferEvents[typeof event]>          )?.(ws, ...args),        );      });      return () => {        unsubs.forEach((fn) => fn());        ws.destroy();        wsRef.current = null;      };      // Only remount when these primitive options change — NOT handlers, NOT colors      // eslint-disable-next-line react-hooks/exhaustive-deps    }, [      url,      height,      barWidth,      barGap,      barRadius,      minPxPerSec,      cursorWidth,      dragToSeek,    ]);    // ── Apply color changes imperatively — zero remount on theme switch    useEffect(() => {      wsRef.current?.setOptions({        waveColor: resolvedWaveColor,        progressColor: resolvedProgressColor,      });    }, [resolvedWaveColor, resolvedProgressColor]);    // ── Skeleton    const [isReady, setIsReady] = useState(false);    useEffect(() => {      const ws = wsRef.current;      if (!ws) return;      // Sync immediately with current instance — avoids skeleton flash on re-render      // when the instance already exists and audio is already decoded      setIsReady(ws.getDuration() > 0);      const unsubs = [        ws.on("ready", () => setIsReady(true)),        ws.on("load", () => setIsReady(false)),        ws.on("destroy", () => setIsReady(false)),      ];      return () => unsubs.forEach((fn) => fn());      // Re-attach when instance changes (url change creates new instance)      // eslint-disable-next-line react-hooks/exhaustive-deps    }, [wsRef.current]);    return (      <div className={className} style={{ position: "relative" }}>        {!isReady && (          <div            style={{              height,              width: "100%",              position: "absolute",              inset: 0,              borderRadius: 4,              background: "hsl(var(--muted))",              animation: "pulse 2s cubic-bezier(0.4,0,0.6,1) infinite",            }}          />        )}        <div ref={containerRef} style={!isReady ? { opacity: 0 } : undefined} />      </div>    );  },  (prev, next) => {    // Only remount when structural audio options change — ignore handlers and className    const STRUCTURAL_KEYS = [      "url",      "height",      "barWidth",      "barGap",      "barRadius",      "minPxPerSec",      "cursorWidth",      "dragToSeek",      "waveColor",      "progressColor",    ];    return STRUCTURAL_KEYS.every(      (k) =>        prev[k as keyof WavesurferProps] === next[k as keyof WavesurferProps],    );  },);export default WavesurferPlayer;// ─── Hook ────────────────────────────────────────────────────────────────────export function useWavesurfer({  container,  waveColor = WAVESURFER_DEFAULTS.waveColor,  progressColor = WAVESURFER_DEFAULTS.progressColor,  ...options}: Omit<WaveSurferOptions, "container"> & {  container: RefObject<HTMLDivElement | null>;}) {  const resolvedWaveColor = useCssVar(waveColor as string);  const resolvedProgressColor = useCssVar(progressColor as string);  const [wavesurfer, setWavesurfer] = useState<WaveSurfer | null>(null);  const [isReady, setIsReady] = useState(false);  const [isPlaying, setIsPlaying] = useState(false);  const [currentTime, setCurrentTime] = useState(0);  const url = options.url as string | undefined;  const height =    (options.height as number | undefined) ?? WAVESURFER_DEFAULTS.height;  const barWidth =    (options.barWidth as number | undefined) ?? WAVESURFER_DEFAULTS.barWidth;  const barGap =    (options.barGap as number | undefined) ?? WAVESURFER_DEFAULTS.barGap;  const barRadius =    (options.barRadius as number | undefined) ?? WAVESURFER_DEFAULTS.barRadius;  const minPxPerSec =    (options.minPxPerSec as number | undefined) ??    WAVESURFER_DEFAULTS.minPxPerSec;  useEffect(() => {    if (!container.current) return;    const ws = WaveSurfer.create({      ...WAVESURFER_DEFAULTS,      ...options,      waveColor: resolvedWaveColor,      progressColor: resolvedProgressColor,      container: container.current,    });    setWavesurfer(ws);    const unsubs = [      ws.on("load", () => {        setIsReady(false);        setIsPlaying(false);        setCurrentTime(0);      }),      ws.on("ready", () => {        setIsReady(true);      }),      ws.on("play", () => {        setIsPlaying(true);      }),      ws.on("pause", () => {        setIsPlaying(false);      }),      ws.on("timeupdate", () => {        setCurrentTime(ws.getCurrentTime());      }),      ws.on("destroy", () => {        setIsReady(false);        setIsPlaying(false);      }),    ];    return () => {      unsubs.forEach((fn) => fn());      ws.destroy();    };    // eslint-disable-next-line react-hooks/exhaustive-deps  }, [url, height, barWidth, barGap, barRadius, minPxPerSec]);  useEffect(() => {    wavesurfer?.setOptions({      waveColor: resolvedWaveColor,      progressColor: resolvedProgressColor,    });  }, [wavesurfer, resolvedWaveColor, resolvedProgressColor]);  return { wavesurfer, isReady, isPlaying, currentTime };}// ─── CSS var resolver ────────────────────────────────────────────────────────export function useCssVar(value: string): string {  const [resolved, setResolved] = useState(value);  useEffect(() => {    const match = value.match(/^var\((--[^)]+)\)$/);    if (!match) {      setResolved(value);      return;    }    const varName = match[1];    const resolve = () => {      const raw = getComputedStyle(document.documentElement)        .getPropertyValue(varName)        .trim();      const isHsl = /^[\d.]+ [\d.]+% [\d.]+%$/.test(raw);      setResolved(raw ? (isHsl ? `hsl(${raw})` : raw) : value);    };    resolve();    const observer = new MutationObserver(resolve);    observer.observe(document.documentElement, {      attributes: true,      attributeFilter: ["class", "style", "data-theme"],    });    return () => observer.disconnect();  }, [value]);  return resolved;}

import * as React from "react";import TimelinePlugin from "wavesurfer.js/dist/plugins/timeline.esm.js";import { cn } from "@/lib/utils";import { Card, CardContent } from "@/components/ui/card";import { Button } from "@/components/ui/button";import { Slider } from "@/components/ui/slider";import {  Play,  Pause,  Volume2,  VolumeX,  Loader2,  RotateCcw,  ZoomIn,  ZoomOut,} from "lucide-react";import WavesurferPlayer from "@/lib/wave-cn";import type WaveSurfer from "wavesurfer.js";// ─── Typesexport interface TimelineOptions {  height?: number;  timeInterval?: number;  primaryLabelInterval?: number;  secondaryLabelInterval?: number;  fontSize?: string;}export interface WaveTimelineProps {  src: string;  title?: string;  defaultVolume?: number;  waveColor?: string;  progressColor?: string;  barWidth?: number;  barGap?: number;  barRadius?: number;  waveHeight?: number;  defaultZoom?: number;  minZoom?: number;  maxZoom?: number;  topTimeline?: TimelineOptions | false;  bottomTimeline?: TimelineOptions | false;  onPlay?: () => void;  onPause?: () => void;  onFinish?: () => void;  onTimeUpdate?: (currentTime: number, duration: number) => void;  className?: string;}// ─── Helpersfunction formatTime(t: number): string {  const m = Math.floor(t / 60);  const s = Math.floor(t % 60);  return `${m}:${s.toString().padStart(2, "0")}`;}// ─── Componentexport function WaveTimeline({  src,  title,  defaultVolume = 0.8,  waveColor,  progressColor,  barWidth = 2,  barGap = 1,  barRadius = 2,  waveHeight = 80,  defaultZoom = 50,  minZoom = 10,  maxZoom = 500,  topTimeline = {},  bottomTimeline = false,  onPlay,  onPause,  onFinish,  onTimeUpdate,  className,}: WaveTimelineProps) {  const wavesurferRef = React.useRef<WaveSurfer | null>(null);  const [isReady, setIsReady] = React.useState(false);  const [isPlaying, setIsPlaying] = React.useState(false);  const [volume, setVolume] = React.useState(defaultVolume);  const [isMuted, setIsMuted] = React.useState(false);  const [duration, setDuration] = React.useState(0);  const [currentTime, setCurrentTime] = React.useState(0);  const [zoom, setZoom] = React.useState(defaultZoom);  // ── Memoized plugins ──────────────────────────────────────────────────────  // Stable array reference — WavesurferPlayer uses reference equality to decide  // whether to recreate the instance, so this must not change on every render.  const plugins = React.useMemo(() => {    if (typeof window === "undefined") return [];    const list: InstanceType<typeof TimelinePlugin>[] = [];    if (topTimeline !== false) {      list.push(        TimelinePlugin.create({          height: topTimeline.height ?? 20,          insertPosition: "beforebegin",          timeInterval: topTimeline.timeInterval ?? 0.5,          primaryLabelInterval: topTimeline.primaryLabelInterval ?? 5,          secondaryLabelInterval: topTimeline.secondaryLabelInterval ?? 1,          style: {            fontSize: topTimeline.fontSize ?? "11px",            color: "var(--muted-foreground)",            background: "var(--muted)",          },        }),      );    }    if (bottomTimeline !== false) {      list.push(        TimelinePlugin.create({          height: bottomTimeline.height ?? 14,          timeInterval: bottomTimeline.timeInterval ?? 0.1,          primaryLabelInterval: bottomTimeline.primaryLabelInterval ?? 1,          secondaryLabelInterval: bottomTimeline.secondaryLabelInterval,          style: {            fontSize: bottomTimeline.fontSize ?? "10px",            color: "var(--muted-foreground)",            background: "var(--muted)",          },        }),      );    }    return list;  }, [JSON.stringify(topTimeline), JSON.stringify(bottomTimeline)]);  // ── Event handlers  const handleReady = React.useCallback(    (ws: WaveSurfer) => {      wavesurferRef.current = ws;      ws.setVolume(defaultVolume);      setDuration(ws.getDuration());      setIsReady(true);    },    [defaultVolume],  );  const handlePlay = React.useCallback(() => {    setIsPlaying(true);    onPlay?.();  }, [onPlay]);  const handlePause = React.useCallback(() => {    setIsPlaying(false);    onPause?.();  }, [onPause]);  const handleFinish = React.useCallback(    (_ws: WaveSurfer) => {      setIsPlaying(false);      onFinish?.();    },    [onFinish],  );  const handleTimeupdate = React.useCallback(    (ws: WaveSurfer) => {      const t = ws.getCurrentTime();      setCurrentTime(t);      onTimeUpdate?.(t, ws.getDuration());    },    [onTimeUpdate],  );  const handleSeeking = React.useCallback((ws: WaveSurfer) => {    setCurrentTime(ws.getCurrentTime());  }, []);  const handleDestroy = React.useCallback(() => {    wavesurferRef.current = null;    setIsReady(false);    setIsPlaying(false);    setCurrentTime(0);    setDuration(0);  }, []);  // ── Zoom ──────────────────────────────────────────────────────────────────  const handleZoom = React.useCallback((v: number[]) => {    const value = v[0];    setZoom(value);    wavesurferRef.current?.zoom(value);  }, []);  const zoomIn = React.useCallback(() => {    const next = Math.min(zoom * 1.5, maxZoom);    setZoom(next);    wavesurferRef.current?.zoom(next);  }, [zoom, maxZoom]);  const zoomOut = React.useCallback(() => {    const next = Math.max(zoom / 1.5, minZoom);    setZoom(next);    wavesurferRef.current?.zoom(next);  }, [zoom, minZoom]);  // ── Playback ──────────────────────────────────────────────────────────────  const togglePlay = React.useCallback(    () => wavesurferRef.current?.playPause(),    [],  );  const restart = React.useCallback(() => {    if (!wavesurferRef.current || !isReady) return;    wavesurferRef.current.setTime(0);    wavesurferRef.current.play();  }, [isReady]);  const handleVolume = React.useCallback((v: number[]) => {    const value = v[0];    setVolume(value);    setIsMuted(value === 0);    wavesurferRef.current?.setVolume(value);  }, []);  const toggleMute = React.useCallback(() => {    if (!wavesurferRef.current) return;    const next = !isMuted;    setIsMuted(next);    wavesurferRef.current.setVolume(next ? 0 : volume);  }, [isMuted, volume]);  const handleSeek = React.useCallback(    ([v]: number[]) => {      if (!wavesurferRef.current || !isReady) return;      wavesurferRef.current.seekTo(v);    },    [isReady],  );  // ── Derived ───────────────────────────────────────────────────────────────  const progress = duration > 0 ? currentTime / duration : 0;  // ── Render ────────────────────────────────────────────────────────────────  return (    <Card      className={cn(        "w-full px-0 border-none rounded-none bg-transparent",        className,      )}    >      <CardContent className=" space-y-3 p-0">        {/* Title */}        {title && (          <p className="text-sm font-medium text-foreground truncate">            {title}          </p>        )}        {/* Waveform + timeline */}        <div className="relative w-full rounded-sm overflow-hidden border border-border">          {!isReady && (            <div              className="absolute inset-0 z-10 flex items-center justify-center bg-card/80 backdrop-blur-[2px]"              style={{ minHeight: waveHeight }}            >              <Loader2 className="w-5 h-5 animate-spin text-muted-foreground" />            </div>          )}          <WavesurferPlayer            url={src}            waveColor={waveColor}            progressColor={progressColor}            height={waveHeight}            barWidth={barWidth}            barGap={barGap}            barRadius={barRadius}            minPxPerSec={defaultZoom}            fillParent            dragToSeek            hideScrollbar={false}            plugins={plugins}            onReady={handleReady}            onPlay={handlePlay}            onPause={handlePause}            onFinish={handleFinish}            onTimeupdate={handleTimeupdate}            onSeeking={handleSeeking}            onDestroy={handleDestroy}          />        </div>        {/* Seek bar */}        <div className="flex items-center gap-2">          <span className="text-[11px] tabular-nums text-muted-foreground w-10 text-right shrink-0">            {formatTime(currentTime)}          </span>          <Slider            className="flex-1"            value={[progress]}            min={0}            max={1}            step={0.001}            disabled={!isReady}            onValueChange={handleSeek}          />          <span className="text-[11px] tabular-nums text-muted-foreground w-10 shrink-0">            {formatTime(duration)}          </span>        </div>        {/* Controls */}        <div className="flex items-center justify-between gap-3 flex-wrap">          {/* Playback */}          <div className="flex items-center gap-1.5">            <Button              size="icon"              variant="ghost"              className="h-8 w-8 text-muted-foreground hover:text-foreground"              disabled={!isReady}              onClick={restart}              aria-label="Restart"            >              <RotateCcw size={15} />            </Button>            <Button              size="icon"              variant="secondary"              className="h-9 w-9"              disabled={!isReady}              onClick={togglePlay}              aria-label={isPlaying ? "Pause" : "Play"}            >              {isPlaying ? <Pause size={17} /> : <Play size={17} />}            </Button>          </div>          {/* Zoom */}          <div className="flex items-center gap-2 flex-1 max-w-50">            <Button              size="icon"              variant="ghost"              className="h-7 w-7 shrink-0 text-muted-foreground hover:text-foreground"              disabled={!isReady || zoom <= minZoom}              onClick={zoomOut}              aria-label="Zoom out"            >              <ZoomOut size={15} />            </Button>            <Slider              value={[zoom]}              min={minZoom}              max={maxZoom}              step={1}              disabled={!isReady}              onValueChange={handleZoom}              aria-label="Zoom"            />            <Button              size="icon"              variant="ghost"              className="h-7 w-7 shrink-0 text-muted-foreground hover:text-foreground"              disabled={!isReady || zoom >= maxZoom}              onClick={zoomIn}              aria-label="Zoom in"            >              <ZoomIn size={15} />            </Button>          </div>          {/* Volume */}          <div className="flex items-center gap-2 w-32">            <Button              size="icon"              variant="ghost"              className="h-7 w-7 shrink-0 text-muted-foreground hover:text-foreground"              onClick={toggleMute}              aria-label={isMuted ? "Unmute" : "Mute"}            >              {isMuted ? <VolumeX size={15} /> : <Volume2 size={15} />}            </Button>            <Slider              value={[isMuted ? 0 : volume]}              min={0}              max={1}              step={0.01}              onValueChange={handleVolume}              aria-label="Volume"            />          </div>        </div>      </CardContent>    </Card>  );}export default WaveTimeline;