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A thin sliver progress bar at the top covers * non-lyrical sections (intros, instrumental breaks) and songs without * alignment data. * * Variants — pick the display context, the component handles the rest: * - `compact`: 480px card used in the kid celebration card (auto-scrolls * the active line to vertical center within a bounded scroll region; * floating play/pause control at the bottom) * - `full`: width-100% surface used on the public share page * (no internal scroll; relies on page scroll; floating play/pause control * at the bottom) * - `row`: list-item friendly. Collapses to a single header row when * the song is idle, smoothly expands to reveal the lyrics surface on * play. The play button + footer slot live inline in the header so the * collapsed state remains a one-line list item. * * Degradation: * - No alignment data → lines render as static text. The sliver progress * bar and play/pause still work. * - Alignment data present but extra words on either side → unmatched * words just lose timing; the rest still highlight. * * Annotations: * - Sections may carry optional "behind the line" notes; when present * they render as a warm strip beneath the lines (share-page Phase 2). */ import { forwardRef, useCallback, useEffect, useMemo, useRef, useState, type ReactNode, } from 'react' import { useSongAlignment } from '@/hooks/useSongAlignment' import { buildSyncedLyricsModel, findActiveLocation, type ActiveLyricLocation, type SongLyricsSection, type SyncedLine, type SyncedLyricsModel, } from '@/lib/song/alignment' import { css } from '../../../styled-system/css' export type SyncedLyricsVariant = 'compact' | 'full' | 'row' export interface SyncedLyricsPlayerProps { audioPath: string alignmentPath: string | null lyrics: SongLyricsSection[] title?: string | null variant?: SyncedLyricsVariant /** Try to begin playback as soon as the audio element mounts. */ autoPlay?: boolean /** Optional slot rendered next to the play control (header in row, footer otherwise). */ footer?: ReactNode /** * Fired exactly once per mount, the first time the audio actually starts * playing — host pages use this for confetti / celebration moments that * should accompany the first beat (not re-fire on every pause/resume). */ onFirstPlay?: () => void } function formatTime(seconds: number): string { if (!Number.isFinite(seconds) || seconds < 0) return '0:00' const m = Math.floor(seconds / 60) const s = Math.floor(seconds % 60) return `${m}:${s.toString().padStart(2, '0')}` } export function SyncedLyricsPlayer({ audioPath, alignmentPath, lyrics, title, variant = 'compact', autoPlay = false, footer, onFirstPlay, }: SyncedLyricsPlayerProps) { const audioRef = useRef<HTMLAudioElement>(null) const scrollRef = useRef<HTMLDivElement>(null) const activeLineRef = useRef<HTMLDivElement | null>(null) const hasAutoplayed = useRef(false) // Tracks whether `onFirstPlay` has already fired this mount — the audio // element emits `play` on every resume too, but we only want the callback // on the very first beat. const hasFiredFirstPlay = useRef(false) const [currentMs, setCurrentMs] = useState(0) const [durationMs, setDurationMs] = useState(0) const [isPlaying, setIsPlaying] = useState(false) const [autoplayBlocked, setAutoplayBlocked] = useState(false) const [userExpanded, setUserExpanded] = useState(false) const alignmentQuery = useSongAlignment(alignmentPath) const model = useMemo( () => buildSyncedLyricsModel(lyrics, alignmentQuery.data ?? null), [lyrics, alignmentQuery.data] ) const active = useMemo(() => findActiveLocation(model, currentMs), [model, currentMs]) // For row variant: only the user's explicit/auto-expand toggles the body open. // We intentionally do NOT include `isPlaying` here so the user can manually // collapse during playback — in that state the header's karaoke ticker is the // lyric surface, leaving the row as a one-line item in a long library. const isRow = variant === 'row' const isFull = variant === 'full' const expanded = !isRow || userExpanded // Auto-expand row variant when playback starts (e.g. via autoPlay or first // click of the play button from a fully-collapsed state). useEffect(() => { if (isPlaying && isRow) setUserExpanded(true) }, [isPlaying, isRow]) // Smooth RAF loop while playing — onTimeUpdate alone fires ~4Hz which is // too coarse for word-level highlight transitions. useEffect(() => { if (!isPlaying) return let rafId = 0 const tick = () => { const audio = audioRef.current if (audio) setCurrentMs(audio.currentTime * 1000) rafId = requestAnimationFrame(tick) } rafId = requestAnimationFrame(tick) return () => cancelAnimationFrame(rafId) }, [isPlaying]) // Auto-play once on ready (best effort — browsers may block). useEffect(() => { if (!autoPlay || hasAutoplayed.current) return const audio = audioRef.current if (!audio) return hasAutoplayed.current = true const timer = setTimeout(() => { audio.play().catch(() => setAutoplayBlocked(true)) }, 200) return () => clearTimeout(timer) }, [autoPlay]) // Auto-scroll the active line into view (compact only — full variant // assumes the whole song fits on the page; row defers to its own scroll // container which is also bounded when expanded). useEffect(() => { if (variant === 'full') return if (!expanded) return const lineEl = activeLineRef.current const container = scrollRef.current if (!lineEl || !container) return const lineRect = lineEl.getBoundingClientRect() const cRect = container.getBoundingClientRect() const buffer = 48 const outOfView = lineRect.top < cRect.top + buffer || lineRect.bottom > cRect.bottom - buffer if (outOfView) { lineEl.scrollIntoView({ behavior: 'smooth', block: 'center' }) } }, [variant, expanded, active?.sectionIndex, active?.lineIndex]) const togglePlay = useCallback(() => { const audio = audioRef.current if (!audio) return if (isPlaying) { audio.pause() } else { // Expand the row synchronously when starting playback — avoids a // single-frame gap before the auto-expand effect catches up. if (isRow) setUserExpanded(true) audio.play().catch(() => setAutoplayBlocked(true)) setAutoplayBlocked(false) } }, [isPlaying, isRow]) const seekToMs = useCallback( (targetMs: number) => { const audio = audioRef.current if (!audio) return const seconds = Math.max(0, targetMs / 1000) audio.currentTime = seconds setCurrentMs(seconds * 1000) if (!isPlaying) { audio.play().catch(() => setAutoplayBlocked(true)) } }, [isPlaying] ) const handleSliverSeek = useCallback( (e: React.MouseEvent<HTMLDivElement>) => { if (durationMs === 0) return const rect = e.currentTarget.getBoundingClientRect() const ratio = Math.max(0, Math.min(1, (e.clientX - rect.left) / rect.width)) seekToMs(ratio * durationMs) }, [durationMs, seekToMs] ) const handleEnded = useCallback(() => { setIsPlaying(false) // Collapse the row variant back to idle when the song finishes. if (isRow) setUserExpanded(false) }, [isRow]) const handleHeaderToggle = useCallback(() => { if (!isRow) return setUserExpanded((prev) => !prev) }, [isRow]) const progress = durationMs > 0 ? (currentMs / durationMs) * 100 : 0 const playButton = ( <button type="button" data-action="toggle-play" aria-label={isPlaying ? 'Pause song' : 'Play song'} onClick={(e) => { e.stopPropagation() togglePlay() }} className={css({ w: isRow ? '40px' : isFull ? '64px' : '52px', h: isRow ? '40px' : isFull ? '64px' : '52px', borderRadius: '50%', bg: 'purple.600', color: 'white', display: 'flex', alignItems: 'center', justifyContent: 'center', fontSize: isRow ? '16px' : isFull ? '28px' : '22px', lineHeight: 1, cursor: 'pointer', border: 'none', // Stronger glow for the full variant so the button reads as the focal // CTA above the lyrics (the share page lands here and visitors should // immediately understand this is something to play, not just read). boxShadow: isFull ? '0 6px 22px rgba(168, 85, 247, 0.55)' : '0 4px 12px rgba(168, 85, 247, 0.4)', transition: 'background 0.15s, transform 0.1s', flexShrink: 0, _hover: { bg: 'purple.700' }, _active: { transform: 'scale(0.94)' }, })} > {isPlaying ? '⏸' : '▶'} </button> ) return ( <div data-component="synced-lyrics-player" data-variant={variant} data-has-alignment={model.hasAlignment ? 'true' : 'false'} data-expanded={expanded ? 'true' : 'false'} className={css({ position: 'relative', w: '100%', maxW: variant === 'compact' ? '480px' : '100%', mx: variant === 'compact' ? 'auto' : 0, borderRadius: '16px', bg: 'purple.50', // Solid in dark mode — the previous 30% opacity blended into whatever // sat behind the card, and when host pages haven't gone dark (e.g. My // Stuff stays on gray.50) the result was a washed-out lavender that // killed contrast with the light dark-mode text. _dark: { bg: 'purple.900', borderColor: 'purple.700' }, overflow: 'hidden', border: '1px solid token(colors.purple.100)', })} > <audio ref={audioRef} src={audioPath} preload="metadata" onTimeUpdate={() => { // Backup path — RAF takes over while playing. if (!isPlaying) setCurrentMs((audioRef.current?.currentTime ?? 0) * 1000) }} onLoadedMetadata={() => { const d = audioRef.current?.duration ?? 0 if (Number.isFinite(d)) setDurationMs(d * 1000) }} onPlay={() => { setIsPlaying(true) if (!hasFiredFirstPlay.current) { hasFiredFirstPlay.current = true onFirstPlay?.() } }} onPause={() => setIsPlaying(false)} onEnded={handleEnded} /> {/* Sliver progress bar — scrubbable, top of card */} <div data-element="progress-sliver" onClick={handleSliverSeek} className={css({ position: 'absolute', top: 0, left: 0, right: 0, h: '3px', bg: 'purple.200/60', cursor: 'pointer', zIndex: 2, })} > <div className={css({ h: '100%', bg: 'purple.600', transition: 'width 0.1s linear', })} style={{ width: `${progress}%` }} /> </div> {/* Header — layout varies by variant */} {isRow ? ( <div data-element="row-header" className={css({ display: 'flex', alignItems: 'center', gap: '12px', px: '14px', pt: '12px', pb: '10px', })} > {/* Title + secondary line. The title is its own toggle button so the karaoke ticker below it (which contains word-buttons for seeking) can sit alongside without nesting buttons. */} <div className={css({ flex: 1, minW: 0 })}> <button type="button" data-action="toggle-row-expand" aria-expanded={expanded ? 'true' : 'false'} onClick={handleHeaderToggle} className={css({ display: 'block', w: '100%', bg: 'transparent', border: 'none', p: 0, m: 0, textAlign: 'left', cursor: 'pointer', color: 'inherit', font: 'inherit', })} > <div data-element="song-title" className={css({ fontSize: '15px', fontWeight: '700', color: 'purple.800', _dark: { color: 'purple.100' }, overflow: 'hidden', textOverflow: 'ellipsis', whiteSpace: 'nowrap', })} > {title ?? 'Celebration Song'} </div> </button> {/* Secondary line — karaoke ticker when the row is collapsed and we have alignment data to surface; otherwise plain time text. Keeps the collapsed row from going lyric-less while the song plays in the background. */} {!expanded && model.hasAlignment && active != null ? ( <ActiveLyricStrip model={model} active={active} onSeekToWord={seekToMs} /> ) : ( <div data-element="song-time" className={css({ fontSize: '11px', color: 'purple.600', _dark: { color: 'purple.300' }, fontVariantNumeric: 'tabular-nums', mt: '2px', })} > {durationMs > 0 ? `${formatTime(currentMs / 1000)} / ${formatTime(durationMs / 1000)}` : formatTime(currentMs / 1000)} </div> )} </div> {playButton} {footer && ( <div data-element="row-footer" className={css({ display: 'flex', alignItems: 'center', flexShrink: 0 })} > {footer} </div> )} </div> ) : ( <div className={css({ display: 'flex', alignItems: 'center', justifyContent: 'space-between', gap: '12px', px: '16px', pt: isFull ? '18px' : '14px', pb: isFull ? '14px' : '6px', })} > <div className={css({ flex: 1, minW: 0 })}> <div data-element="song-title" className={css({ fontSize: isFull ? '17px' : '15px', fontWeight: '700', color: 'purple.800', _dark: { color: 'purple.100' }, overflow: 'hidden', textOverflow: 'ellipsis', whiteSpace: 'nowrap', })} > {title ?? ''} </div> <div data-element="song-time" className={css({ fontSize: '12px', color: 'purple.600', _dark: { color: 'purple.300' }, fontVariantNumeric: 'tabular-nums', mt: '2px', })} > {durationMs > 0 ? `${formatTime(currentMs / 1000)} / ${formatTime(durationMs / 1000)}` : formatTime(currentMs / 1000)} </div> {/* Full variant only — the play button lives in the header now (so share-page visitors see it before the lyric wall), and this line surfaces the autoplay-blocked hint near it. */} {isFull && autoplayBlocked && !isPlaying && ( <div data-element="autoplay-hint" className={css({ mt: '4px', fontSize: '12px', color: 'purple.700', _dark: { color: 'purple.200' }, fontWeight: '600', })} > Tap play to start the song </div> )} </div> {isFull && playButton} </div> )} {/* Collapsible body — only the row variant actually collapses; others render their body unconditionally. Uses CSS grid template rows for a smooth height transition without measuring the content. */} <div data-element="body-collapse" className={css({ display: 'grid', transition: 'grid-template-rows 280ms cubic-bezier(0.4, 0, 0.2, 1)', })} style={{ gridTemplateRows: expanded ? '1fr' : '0fr' }} > <div className={css({ overflow: 'hidden', transition: 'opacity 220ms ease', })} style={{ opacity: expanded ? 1 : 0 }} > {/* Lyrics surface */} <div ref={scrollRef} data-element="lyrics-scroll" className={css({ px: '16px', py: '8px', maxH: variant === 'compact' ? '240px' : variant === 'row' ? '320px' : 'unset', overflowY: variant === 'compact' || variant === 'row' ? 'auto' : 'visible', scrollBehavior: 'smooth', })} > {model.sections.map((section, si) => { const isActiveSection = active?.sectionIndex === si const sectionAnnotations = section.annotations ?? [] return ( <div key={si} data-element="lyric-section" data-active-section={isActiveSection ? 'true' : undefined} className={css({ mb: '14px' })} > <div data-element="section-label" className={css({ // Full variant: display-italic, larger, with a thin // rule beneath so each section reads like a chapter. // Compact/row variants keep the original tight caps. ...(isFull ? { fontFamily: 'display', fontStyle: 'italic', fontSize: '20px', fontWeight: '600', letterSpacing: 'normal', textTransform: 'none', pb: '6px', mb: '10px', borderBottom: '1px solid token(colors.purple.200)', } : { fontSize: '10px', fontWeight: '700', letterSpacing: '0.08em', textTransform: 'uppercase', mb: '6px', }), color: isActiveSection ? 'purple.600' : 'purple.400', _dark: { color: isActiveSection ? 'purple.200' : 'purple.500' }, transition: 'color 0.2s', })} > {section.name} </div> {section.lines.map((line, li) => { const isActiveLine = active?.sectionIndex === si && active?.lineIndex === li const isPastLine = active != null && (si < active.sectionIndex || (si === active.sectionIndex && li < active.lineIndex)) return ( <LyricLine key={li} ref={isActiveLine ? activeLineRef : null} line={line} isActiveLine={isActiveLine} isPastLine={isPastLine} activeWordIndex={isActiveLine ? (active?.wordIndex ?? -1) : -1} variant={variant} onSeekToWord={seekToMs} /> ) })} {sectionAnnotations.length > 0 && ( <div data-element="lyric-annotations" className={css({ mt: '10px', px: isFull ? '14px' : '10px', py: isFull ? '12px' : '8px', background: isFull ? 'linear-gradient(135deg, rgba(254, 243, 199, 0.7), rgba(254, 215, 170, 0.5))' : 'token(colors.amber.50)', _dark: { bg: 'amber.900/20', background: 'none' }, borderLeft: '3px solid token(colors.amber.400)', borderRadius: '10px', display: 'flex', flexDirection: 'column', gap: '6px', })} > {sectionAnnotations.map((note, ai) => ( <div key={ai} className={css({ fontFamily: isFull ? 'display' : 'inherit', fontStyle: isFull ? 'italic' : 'normal', fontSize: isFull ? '14px' : '12px', lineHeight: '1.5', color: 'amber.800', _dark: { color: 'amber.200' }, display: 'flex', gap: '8px', alignItems: 'flex-start', })} > <span aria-hidden="true">✨</span> <span>{note}</span> </div> ))} </div> )} </div> ) })} </div> {/* Bottom controls — compact variant only. The full variant lifts the play button into the header so it's visible above the lyric wall; the row variant carries its controls in the header too. */} {!isRow && !isFull && ( <div className={css({ display: 'flex', flexDirection: 'column', alignItems: 'center', gap: '8px', py: '12px', })} > {playButton} {autoplayBlocked && !isPlaying && ( <div data-element="autoplay-hint" className={css({ fontSize: '12px', color: 'purple.600', _dark: { color: 'purple.300' }, fontWeight: '500', })} > Tap to play </div> )} {footer} </div> )} </div> </div> </div> ) } // ============================================================================ // ActiveLyricStrip — single-line karaoke ticker for tight contexts (the // collapsed `row` variant). Renders the current line of lyrics with the // active word pill-styled, and auto-scrolls horizontally to keep that word // centered. Each word is a seek target, same as the full lyrics surface. // ============================================================================ interface ActiveLyricStripProps { model: SyncedLyricsModel active: ActiveLyricLocation onSeekToWord: (ms: number) => void } function ActiveLyricStrip({ model, active, onSeekToWord }: ActiveLyricStripProps) { const stripRef = useRef<HTMLDivElement>(null) const activeWordRef = useRef<HTMLButtonElement>(null) // Center the active word inside the strip's scrollport. Runs whenever the // active location moves (word, line, or section). useEffect(() => { const strip = stripRef.current const word = activeWordRef.current if (!strip || !word) return const target = word.offsetLeft + word.offsetWidth / 2 - strip.clientWidth / 2 strip.scrollTo({ left: Math.max(0, target), behavior: 'smooth' }) }, [active.sectionIndex, active.lineIndex, active.wordIndex]) const section = model.sections[active.sectionIndex] const line = section?.lines[active.lineIndex] if (!line?.words) return null return ( <div ref={stripRef} data-element="active-lyric-strip" className={css({ mt: '2px', display: 'flex', gap: '3px', overflowX: 'auto', whiteSpace: 'nowrap', scrollbarWidth: 'none', // Soft fade at both edges so off-screen words don't visually clip hard. WebkitMaskImage: 'linear-gradient(to right, transparent 0, black 16px, black calc(100% - 16px), transparent 100%)', maskImage: 'linear-gradient(to right, transparent 0, black 16px, black calc(100% - 16px), transparent 100%)', '&::-webkit-scrollbar': { display: 'none' }, })} > {line.words.map((word, wi) => { const isActive = wi === active.wordIndex return ( <button key={wi} ref={isActive ? activeWordRef : null} type="button" data-action="seek-to-word" data-active-word={isActive ? 'true' : undefined} onClick={(e) => { e.stopPropagation() onSeekToWord(word.startMs) }} className={css({ fontSize: '12px', lineHeight: '18px', border: 'none', bg: 'transparent', color: 'purple.500', // Brighter in dark mode — purple.300 was too faint against the // solid purple.900 card; the dim words still read as secondary // but stay legible. _dark: { color: 'purple.200' }, cursor: 'pointer', borderRadius: '4px', px: '4px', flexShrink: 0, transition: 'color 120ms, background 120ms, font-weight 120ms', '&[data-active-word="true"]': { color: 'purple.900', bg: 'purple.200', fontWeight: '700', _dark: { color: 'purple.50', bg: 'purple.600' }, }, _hover: { bg: 'purple.200/60', _dark: { bg: 'purple.700/60' }, }, })} > {word.text} </button> ) })} </div> ) } // ============================================================================ // LyricLine — extracted so the active-line ref forward stays tidy // ============================================================================ interface LyricLineProps { line: SyncedLine isActiveLine: boolean isPastLine: boolean activeWordIndex: number variant: SyncedLyricsVariant onSeekToWord: (ms: number) => void } const LyricLine = forwardRef<HTMLDivElement, LyricLineProps>(function LyricLine( { line, isActiveLine, isPastLine, activeWordIndex, variant, onSeekToWord }, ref ) { const color = isActiveLine ? 'purple.900' : isPastLine ? 'purple.400' : 'gray.500' const darkColor = isActiveLine ? 'purple.50' : isPastLine ? 'purple.500' : 'gray.500' const words = line.words return ( <div ref={ref} data-element="lyric-line" data-active-line={isActiveLine ? 'true' : undefined} data-past-line={isPastLine ? 'true' : undefined} className={css({ fontSize: variant === 'full' ? '17px' : '16px', lineHeight: '1.55', color, _dark: { color: darkColor }, fontWeight: isActiveLine ? '700' : '500', transition: 'color 0.2s, font-weight 0.2s, border-color 0.2s', borderLeft: isActiveLine ? '3px solid token(colors.purple.500)' : '3px solid transparent', pl: '8px', mb: '4px', })} > {words ? words.map((word, wi) => { const isActiveWord = isActiveLine && wi === activeWordIndex return ( <span key={wi}> <button type="button" data-action="seek-to-word" data-active-word={isActiveWord ? 'true' : undefined} onClick={() => onSeekToWord(word.startMs)} className={css({ bg: 'transparent', border: 'none', p: 0, m: 0, font: 'inherit', color: 'inherit', cursor: 'pointer', borderRadius: '5px', px: '3px', py: '1px', transition: 'background 120ms cubic-bezier(0.4, 0, 0.2, 1), box-shadow 120ms cubic-bezier(0.4, 0, 0.2, 1), transform 120ms cubic-bezier(0.4, 0, 0.2, 1)', '&[data-active-word="true"]': { bg: 'purple.300', _dark: { bg: 'purple.700' }, boxShadow: '0 2px 8px rgba(168, 85, 247, 0.35)', transform: 'translateY(-1px)', }, _hover: { bg: 'purple.200/60', _dark: { bg: 'purple.800/60' }, }, })} > {word.text} </button> {wi < words.length - 1 && ' '} </span> ) }) : line.rawText} </div> ) }) |