import { useCallback, useEffect, useId, useMemo, useReducer, useRef, useState, } from 'react'; /* ----------------------------------------------------------------- types */ export interface Track { title: string; artist: string; cover: string; src: string; } export type LoopMode = 'off' | 'all' | 'one'; export type Direction = 'next' | 'prev' | null; type AudioCtor = typeof AudioContext; /* ------------------------------------------------------------- useRafLoop */ function useRafLoop(cb: (now: number, dt: number) => void) { const cbRef = useRef(cb); cbRef.current = cb; useEffect(() => { let raf = 0; let last = performance.now(); const loop = (now: number) => { const dt = now - last; last = now; cbRef.current(now, dt); raf = requestAnimationFrame(loop); }; raf = requestAnimationFrame(loop); return () => cancelAnimationFrame(raf); }, []); } /* -------------------------------------------------- useTransitionSound */ function useTransitionSound() { const ctxRef = useRef(null); useEffect(() => { return () => { ctxRef.current?.close().catch(() => {}); ctxRef.current = null; }; }, []); return useCallback((bassEnergy = 0.5) => { try { if (!ctxRef.current) { const Ctor: AudioCtor = window.AudioContext || (window as unknown as { webkitAudioContext: AudioCtor }) .webkitAudioContext; if (!Ctor) return; ctxRef.current = new Ctor(); } const ctx = ctxRef.current; if (ctx.state === 'suspended') ctx.resume(); const now = ctx.currentTime; const osc = ctx.createOscillator(); const gain = ctx.createGain(); const startFreq = 440 + bassEnergy * 440; const endFreq = startFreq * (2 / 3); osc.type = 'triangle'; osc.frequency.setValueAtTime(startFreq, now); osc.frequency.exponentialRampToValueAtTime(endFreq, now + 0.09); gain.gain.setValueAtTime(0.0001, now); gain.gain.exponentialRampToValueAtTime(0.06, now + 0.012); gain.gain.exponentialRampToValueAtTime(0.0001, now + 0.16); osc.connect(gain).connect(ctx.destination); osc.start(now); osc.stop(now + 0.18); } catch { /* Web Audio unavailable */ } }, []); } /* --------------------------------------------------- useAudioAnalyser */ const FFT_SIZE = 256; function useAudioAnalyser( audioRef: React.RefObject ) { const ctxRef = useRef(null); const analyserRef = useRef(null); const dataRef = useRef(new Uint8Array(FFT_SIZE / 2)); const connectedRef = useRef(false); const connect = useCallback(() => { const audio = audioRef.current; if (!audio || connectedRef.current) return; try { const Ctor: AudioCtor = window.AudioContext || (window as unknown as { webkitAudioContext: AudioCtor }) .webkitAudioContext; if (!Ctor) return; const ctx = new Ctor(); const analyser = ctx.createAnalyser(); analyser.fftSize = FFT_SIZE; analyser.smoothingTimeConstant = 0.8; const source = ctx.createMediaElementSource(audio); source.connect(analyser); analyser.connect(ctx.destination); ctxRef.current = ctx; analyserRef.current = analyser; dataRef.current = new Uint8Array(analyser.frequencyBinCount); connectedRef.current = true; if (ctx.state === 'suspended') ctx.resume().catch(() => {}); } catch { /* unavailable or already connected */ } }, [audioRef]); useEffect(() => { const audio = audioRef.current; if (!audio) return; audio.addEventListener('play', connect, { once: true }); return () => audio.removeEventListener('play', connect); }, [audioRef, connect]); useEffect(() => { return () => { ctxRef.current?.close().catch(() => {}); ctxRef.current = null; }; }, []); const getFrequencyData = useCallback((): Uint8Array | null => { const analyser = analyserRef.current; if (!analyser) return null; if (ctxRef.current?.state === 'suspended') ctxRef.current.resume().catch(() => {}); analyser.getByteFrequencyData(dataRef.current); return dataRef.current; }, []); const getBandEnergy = useCallback( (startBin: number, endBin: number): number => { if (!analyserRef.current) return 0; const data = dataRef.current; const count = endBin - startBin; if (count <= 0) return 0; let sum = 0; for (let i = startBin; i < endBin && i < data.length; i++) sum += data[i]; return sum / count / 255; }, [] ); return { getFrequencyData, getBandEnergy }; } /* ------------------------------------------------------ useAudioPlayer */ interface State { currentIndex: number; order: number[]; shuffled: boolean; loopMode: LoopMode; isPlaying: boolean; direction: Direction; } type Action = | { type: 'PLAY' } | { type: 'PAUSE' } | { type: 'SET_TRACK'; index: number; direction: Direction } | { type: 'TOGGLE_SHUFFLE'; trackCount: number } | { type: 'CYCLE_LOOP' }; function shuffleOrder(pinFirst: number, count: number): number[] { const rest = Array.from({ length: count }, (_, i) => i).filter( (x) => x !== pinFirst ); for (let i = rest.length - 1; i > 0; i--) { const j = Math.floor(Math.random() * (i + 1)); [rest[i], rest[j]] = [rest[j], rest[i]]; } return [pinFirst, ...rest]; } function reducer(state: State, action: Action): State { switch (action.type) { case 'PLAY': return { ...state, isPlaying: true }; case 'PAUSE': return { ...state, isPlaying: false }; case 'SET_TRACK': return { ...state, currentIndex: action.index, direction: action.direction, }; case 'TOGGLE_SHUFFLE': { const shuffled = !state.shuffled; const order = shuffled ? shuffleOrder(state.currentIndex, action.trackCount) : Array.from({ length: action.trackCount }, (_, i) => i); return { ...state, shuffled, order }; } case 'CYCLE_LOOP': { const next: LoopMode = state.loopMode === 'off' ? 'all' : state.loopMode === 'all' ? 'one' : 'off'; return { ...state, loopMode: next }; } default: return state; } } function useAudioPlayer(tracks: Track[]) { const audioRef = useRef(null); const [currentTime, setCurrentTime] = useState(0); const [duration, setDuration] = useState(0); const [state, dispatch] = useReducer(reducer, { currentIndex: 0, order: Array.from({ length: tracks.length }, (_, i) => i), shuffled: false, loopMode: 'off', isPlaying: false, direction: null, }); const { getFrequencyData, getBandEnergy } = useAudioAnalyser(audioRef); const playTransitionSound = useTransitionSound(); const loadTrack = useCallback( (index: number, autoplay: boolean, direction: Direction) => { const audio = audioRef.current; if (!audio) return; const bassEnergy = getBandEnergy(0, 4); playTransitionSound(bassEnergy); dispatch({ type: 'SET_TRACK', index, direction }); audio.src = tracks[index].src; audio.load(); if (autoplay) audio.play().catch(() => {}); }, [tracks, playTransitionSound, getBandEnergy] ); const toggle = useCallback(() => { const audio = audioRef.current; if (!audio) return; if (audio.paused) audio.play().catch(() => {}); else audio.pause(); }, []); const next = useCallback(() => { const audio = audioRef.current; if (!audio) return; const pos = state.order.indexOf(state.currentIndex); const np = pos + 1; if (np >= state.order.length) { if (state.loopMode === 'all') loadTrack(state.order[0], !audio.paused, 'next'); else { audio.pause(); audio.currentTime = 0; } return; } loadTrack(state.order[np], !audio.paused, 'next'); }, [state.order, state.currentIndex, state.loopMode, loadTrack]); const prev = useCallback(() => { const audio = audioRef.current; if (!audio) return; if (audio.currentTime > 3) { audio.currentTime = 0; return; } const pos = state.order.indexOf(state.currentIndex); const pp = pos - 1; if (pp < 0) { if (state.loopMode === 'all') loadTrack(state.order[state.order.length - 1], !audio.paused, 'prev'); else audio.currentTime = 0; return; } loadTrack(state.order[pp], !audio.paused, 'prev'); }, [state.order, state.currentIndex, state.loopMode, loadTrack]); const seek = useCallback((pct: number) => { const audio = audioRef.current; if (!audio || !audio.duration) return; audio.currentTime = pct * audio.duration; }, []); const toggleShuffle = useCallback(() => { dispatch({ type: 'TOGGLE_SHUFFLE', trackCount: tracks.length }); }, [tracks.length]); const cycleLoop = useCallback(() => { dispatch({ type: 'CYCLE_LOOP' }); }, []); useEffect(() => { const audio = audioRef.current; if (!audio) return; const onPlay = () => dispatch({ type: 'PLAY' }); const onPause = () => dispatch({ type: 'PAUSE' }); const onLoadedMetadata = () => setDuration(audio.duration); const onTimeUpdate = () => { setCurrentTime(audio.currentTime); if (audio.duration) setDuration(audio.duration); }; const onEnded = () => { if (state.loopMode === 'one') { audio.currentTime = 0; audio.play().catch(() => {}); } else next(); }; audio.addEventListener('play', onPlay); audio.addEventListener('pause', onPause); audio.addEventListener('loadedmetadata', onLoadedMetadata); audio.addEventListener('timeupdate', onTimeUpdate); audio.addEventListener('ended', onEnded); return () => { audio.removeEventListener('play', onPlay); audio.removeEventListener('pause', onPause); audio.removeEventListener('loadedmetadata', onLoadedMetadata); audio.removeEventListener('timeupdate', onTimeUpdate); audio.removeEventListener('ended', onEnded); }; }, [state.loopMode, next]); useEffect(() => { const audio = audioRef.current; if (!audio) return; audio.src = tracks[0].src; audio.load(); }, [tracks]); return { audioRef, state, currentTime, duration, currentTrack: tracks[state.currentIndex], toggle, next, prev, seek, toggleShuffle, cycleLoop, getFrequencyData, }; } /* ------------------------------------------------ useKeyboardShortcuts */ interface ShortcutActions { toggle: () => void; next: () => void; prev: () => void; seekForward: () => void; seekBackward: () => void; toggleShuffle: () => void; cycleLoop: () => void; } function useKeyboardShortcuts(actions: ShortcutActions) { useEffect(() => { const handler = (e: KeyboardEvent) => { if ((e.target as HTMLElement).tagName === 'INPUT') return; switch (e.key) { case ' ': e.preventDefault(); actions.toggle(); break; case 'ArrowRight': e.preventDefault(); if (e.shiftKey) actions.next(); else actions.seekForward(); break; case 'ArrowLeft': e.preventDefault(); if (e.shiftKey) actions.prev(); else actions.seekBackward(); break; case 's': case 'S': actions.toggleShuffle(); break; case 'l': case 'L': actions.cycleLoop(); break; } }; document.addEventListener('keydown', handler); return () => document.removeEventListener('keydown', handler); }, [actions]); } /* --------------------------------------------------------- ScalesMixer */ const COLS = 10; const ROWS = 10; const BAND_RANGES: [number, number][] = [ [0, 1], [1, 3], [3, 6], [6, 10], [10, 16], [16, 24], [24, 36], [36, 52], [52, 74], [74, 100], ]; const sineOut = (x: number) => Math.sin((x * Math.PI) / 2); const sineIn = (x: number) => 1 - Math.cos((x * Math.PI) / 2); const sineInOut = (x: number) => -(Math.cos(Math.PI * x) - 1) / 2; const lerp = (a: number, b: number, t: number) => a + (b - a) * t; const PART_A_DUR = 1.5; const PART_A_TO = 11; const PART_A_STEP = 3 / (COLS - 1); const PART_B_DUR = 1; const SCALE_FROM = 0.133; const SCALE_TO = 0.8; function partAColumnY(time: number, col: number): number { const local = time - col * PART_A_STEP; const period = PART_A_DUR * 2; const cyc = ((local % period) + period) % period; if (cyc < PART_A_DUR) return PART_A_TO * sineInOut(cyc / PART_A_DUR); return PART_A_TO * sineInOut(1 - (cyc - PART_A_DUR) / PART_A_DUR); } function partBCircle( time: number, col: number, row: number ): [number, number] { const frac = row / ROWS; const yFrom = lerp(77, -77, frac); const yTo = lerp(col, -col, frac); const local = time - col / COLS; const period = PART_B_DUR * 2; const cyc = ((local % period) + period) % period; let e: number; if (cyc < PART_B_DUR) e = sineOut(cyc / PART_B_DUR); else e = sineIn(1 - (cyc - PART_B_DUR) / PART_B_DUR); return [lerp(yFrom, yTo, e), lerp(SCALE_FROM, SCALE_TO, e)]; } function ScalesMixer({ isPlaying, getFrequencyData, }: { isPlaying: boolean; getFrequencyData?: () => Uint8Array | null; }) { const maskId = useId().replace(/:/g, '_'); const colRefs = useRef<(SVGGElement | null)[]>([]); const circleRefs = useRef<(SVGCircleElement | null)[][]>( Array.from({ length: COLS }, () => []) ); const tRef = useRef(50); useRafLoop((_, dt) => { if (isPlaying) tRef.current += dt / 1000; const time = tRef.current; const freqData = getFrequencyData?.(); for (let c = 0; c < COLS; c++) { let energy = 1.0; if (freqData) { const [binStart, binEnd] = BAND_RANGES[c]; let sum = 0; for (let b = binStart; b < binEnd; b++) sum += freqData[b] ?? 0; energy = Math.sqrt(sum / (binEnd - binStart) / 255); } const bobGain = freqData ? 0.4 + energy : 1; const scaleGain = freqData ? 0.5 + energy : 1; const colEl = colRefs.current[c]; if (colEl) { const ay = partAColumnY(time, c) * bobGain; colEl.style.transform = `translate(${c * 10}px, ${ay}px)`; } for (let r = 0; r < ROWS; r++) { const circle = circleRefs.current[c][r]; if (!circle) continue; const [ty, s] = partBCircle(time, c, r); circle.style.transform = `translateY(${ty}px) scale(${ s * scaleGain })`; } } }); return ( ); } /* ------------------------------------------------------- Disc + layers */ const SPIN_MAX = 0.4375; const BURST_DURATION = 620; interface Layer { id: number; track: Track; dir: Direction; } function Disc({ layers, isPlaying, isZoomed, trackKey, direction, onZoomToggle, }: { layers: Layer[]; isPlaying: boolean; isZoomed: boolean; trackKey: number; direction: Direction; onZoomToggle: () => void; }) { const spinRef = useRef(null); const rotRef = useRef(0); const velRef = useRef(0); const burstRef = useRef({ from: 0, start: 0, active: false, pending: false }); const lastKey = useRef(trackKey); useEffect(() => { if (trackKey !== lastKey.current) { lastKey.current = trackKey; if (direction) { burstRef.current.from = direction === 'prev' ? 360 : -360; burstRef.current.pending = true; } } }, [trackKey, direction]); useRafLoop((now) => { const el = spinRef.current; if (!el) return; if (isPlaying) velRef.current += (SPIN_MAX - velRef.current) * 0.2; else { velRef.current *= 0.96; if (velRef.current < 0.001) velRef.current = 0; } if (isZoomed) { const target = Math.round(rotRef.current / 360) * 360; const nx = rotRef.current + (target - rotRef.current) * 0.08; rotRef.current = Math.abs(target - nx) < 0.1 ? target : nx; } else { rotRef.current += velRef.current; } const burst = burstRef.current; if (burst.pending) { burst.start = now; burst.pending = false; burst.active = true; } let b = 0; if (burst.active) { const t = (now - burst.start) / BURST_DURATION; if (t >= 1) burst.active = false; else b = burst.from * (1 - (1 - Math.pow(1 - t, 3))); } el.style.transform = `scale(1.01) rotate(${rotRef.current + b}deg)`; }); return (

{ e.stopPropagation(); onZoomToggle(); }} >

{layers.map((l, i) => { const isNewest = i === layers.length - 1; const cls = isNewest ? l.dir ? 'cover cover-enter' : 'cover' : 'cover cover-exit'; return ( {`${l.track.title}

); })}

); } /* ------------------------------------------------------------ TrackInfo */ function TrackInfo({ layers }: { layers: Layer[] }) { return (

{layers.map((l, i) => { const isNewest = i === layers.length - 1; const dx = l.dir === 'next' ? 14 : l.dir === 'prev' ? -14 : 0; const exitDx = -dx; const state = isNewest ? (l.dir ? 'ti-enter' : '') : 'ti-exit'; const style = { ['--dx' as string]: `${isNewest ? dx : exitDx}px`, } as React.CSSProperties; return (

{l.track.artist}

{l.track.title}

); })}

); } /* ----------------------------------------------------------- ProgressBar */ function fmt(s: number): string { if (!isFinite(s)) return '0:00'; return `${Math.floor(s / 60)}:${String(Math.floor(s % 60)).padStart( 2, '0' )}`; } function ProgressBar({ currentTime, duration, onSeek, }: { currentTime: number; duration: number; onSeek: (pct: number) => void; }) { const pct = duration ? (currentTime / duration) * 100 : 0; return ( <>

{ const rect = e.currentTarget.getBoundingClientRect(); onSeek( Math.max( 0, Math.min(1, (e.clientX - rect.left) / rect.width) ) ); }} >

{fmt(currentTime)} / {fmt(duration)}

); } /* -------------------------------------------------------------- Controls */ function Controls({ isPlaying, shuffled, loopMode, onToggle, onNext, onPrev, onShuffle, onLoop, }: { isPlaying: boolean; shuffled: boolean; loopMode: LoopMode; onToggle: () => void; onNext: () => void; onPrev: () => void; onShuffle: () => void; onLoop: () => void; }) { return (

); } /* ----------------------------------------------------- MusicPlayer root */ export interface MusicPlayerProps { tracks: Track[]; crossOrigin?: 'anonymous' | 'use-credentials'; } export function MusicPlayer({ tracks, crossOrigin }: MusicPlayerProps) { const player = useAudioPlayer(tracks); const [isZoomed, setIsZoomed] = useState(false); const [layers, setLayers] = useState(() => [ { id: 0, track: tracks[0], dir: null }, ]); const lastIndex = useRef(0); const idRef = useRef(1); useEffect(() => { if (player.state.currentIndex === lastIndex.current) return; lastIndex.current = player.state.currentIndex; const id = idRef.current++; setLayers((prev) => [ ...prev, { id, track: player.currentTrack, dir: player.state.direction }, ]); const t = setTimeout(() => { setLayers((prev) => prev.filter((l) => l.id === id)); }, 760); return () => clearTimeout(t); }, [ player.state.currentIndex, player.currentTrack, player.state.direction, ]); const seekForward = useCallback(() => { const a = player.audioRef.current; if (a) a.currentTime = Math.min(a.duration || 0, a.currentTime + 5); }, [player.audioRef]); const seekBackward = useCallback(() => { const a = player.audioRef.current; if (a) a.currentTime = Math.max(0, a.currentTime - 5); }, [player.audioRef]); const shortcuts = useMemo( () => ({ toggle: player.toggle, next: player.next, prev: player.prev, seekForward, seekBackward, toggleShuffle: player.toggleShuffle, cycleLoop: player.cycleLoop, }), [ player.toggle, player.next, player.prev, seekForward, seekBackward, player.toggleShuffle, player.cycleLoop, ] ); useKeyboardShortcuts(shortcuts); return (

{ if (!(e.target as HTMLElement).closest('.mask')) setIsZoomed(false); }} >

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Music Player Widget

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