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import { pitchToStaffPosition, getStemDirection, getLedgerLinePositions } from './noteUtils'
import type { PitchClass, Clef, Accidental } from './noteUtils'
export interface MusicStaffProps {
pitchClass: PitchClass
octave: number
clef: Clef
accidental?: Accidental
width?: number
height?: number
showClef?: boolean
}
/**
* SVG component rendering a music staff with a single note.
*
* Ported from the jsPDF rendering in api/create/music-flashcards/route.ts.
* Position system: 0 = bottom line, 8 = top line.
* Y formula: staffTop + (8 - position) * lineGap
*/
export function MusicStaff({
pitchClass,
octave,
clef,
accidental,
width = 120,
height = 80,
showClef = true,
}: MusicStaffProps) {
const lineGap = height * 0.08
const staffTop = height * 0.3
const staffWidth = width * 0.85
const staffLeft = (width - staffWidth) / 2
const position = pitchToStaffPosition(pitchClass as PitchClass, octave, clef)
const stemDir = getStemDirection(position)
const ledgerPositions = getLedgerLinePositions(position)
// Note position
const noteY = staffTop + (8 - position) * lineGap
const noteX = staffLeft + staffWidth * 0.72
// Note head dimensions (ellipse) — sized to fill a staff space
const noteRx = 6
const noteRy = 4.2
// Stem
const stemHeight = lineGap * 7
const stemX = stemDir === 'up' ? noteX + noteRx - 0.5 : noteX - noteRx + 0.5
const stemY1 = noteY
const stemY2 = stemDir === 'up' ? noteY - stemHeight : noteY + stemHeight
// Clef positioning
// The staff spans from staffTop (top line) to staffTop + 8*lineGap (bottom line).
// The treble clef glyph (𝄞) visually centers around the G line (position 2).
// The bass clef glyph (𝄢) visually centers around the F line (position 6, i.e. 4th line).
// These Unicode glyphs are tall and need large font sizes to span the staff properly.
const staffHeight = lineGap * 8
const clefX = staffLeft + 2
const clefSymbol = clef === 'treble' ? '\u{1D11E}' : '\u{1D122}'
const clefFontSize = clef === 'treble' ? staffHeight * 2.4 : staffHeight * 0.9
// Treble clef: anchor near bottom of staff — the glyph extends upward
const trebleClefY = staffTop + staffHeight * 0.85 - lineGap * 1.5
// Bass clef: anchor near the F line (4th line from bottom)
const bassClefY = staffTop + (8 - 4) * lineGap + lineGap * 0.3
const clefY = clef === 'treble' ? trebleClefY : bassClefY
// Accidental positioning
const accidentalSymbol =
accidental === 'sharp'
? '\u266F'
: accidental === 'flat'
? '\u266D'
: accidental === 'natural'
? '\u266E'
: null
const accidentalX = noteX - noteRx - 8
const accidentalY = noteY + 3
return (
<svg
width={width}
height={height}
viewBox={`0 0 ${width} ${height}`}
overflow="visible"
data-component="MusicStaff"
data-clef={clef}
data-note={`${pitchClass}${octave}`}
>
{/* Staff lines */}
{Array.from({ length: 5 }, (_, i) => {
const y = staffTop + i * lineGap * 2
return (
<line
key={`staff-${i}`}
x1={staffLeft}
y1={y}
x2={staffLeft + staffWidth}
y2={y}
stroke="#333"
strokeWidth={0.8}
/>
)
})}
{/* Clef */}
{showClef && (
<text
x={clefX}
y={clefY}
fontSize={clefFontSize}
fontFamily="serif"
fill="#333"
dominantBaseline="middle"
textAnchor="start"
>
{clefSymbol}
</text>
)}
{/* Ledger lines */}
{ledgerPositions.map((pos) => {
const y = staffTop + (8 - pos) * lineGap
return (
<line
key={`ledger-${pos}`}
x1={noteX - 11}
y1={y}
x2={noteX + 11}
y2={y}
stroke="#333"
strokeWidth={0.8}
/>
)
})}
{/* Accidental */}
{accidentalSymbol && (
<text
x={accidentalX}
y={accidentalY}
fontSize={12}
fontFamily="serif"
fill="#333"
textAnchor="middle"
>
{accidentalSymbol}
</text>
)}
{/* Note head (slightly tilted ellipse) */}
<ellipse
cx={noteX}
cy={noteY}
rx={noteRx}
ry={noteRy}
fill="#333"
transform={`rotate(-10, ${noteX}, ${noteY})`}
/>
{/* Stem */}
<line x1={stemX} y1={stemY1} x2={stemX} y2={stemY2} stroke="#333" strokeWidth={1.2} />
</svg>
)
}
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