376 lines
13 KiB
JavaScript
376 lines
13 KiB
JavaScript
import { useState, useEffect, useRef, useCallback } from "react";
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// ============================================================================
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// Web Audio Engine (shared with SpeedCalculatorModal pattern)
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// ============================================================================
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function bellFrequency(bellNumber) {
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return 880 * Math.pow(Math.pow(2, 1 / 12), -2 * (bellNumber - 1));
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}
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function playStep(audioCtx, stepValue, beatDurationMs) {
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if (!stepValue || !audioCtx) return;
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const now = audioCtx.currentTime;
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const duration = beatDurationMs / 1000;
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const fadeIn = 0.005;
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const fadeOut = 0.03;
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for (let bit = 0; bit < 16; bit++) {
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if (stepValue & (1 << bit)) {
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const freq = bellFrequency(bit + 1);
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const osc = audioCtx.createOscillator();
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const gain = audioCtx.createGain();
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osc.connect(gain);
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gain.connect(audioCtx.destination);
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osc.type = "sine";
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osc.frequency.setValueAtTime(freq, now);
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gain.gain.setValueAtTime(0, now);
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gain.gain.linearRampToValueAtTime(0.3, now + fadeIn);
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gain.gain.setValueAtTime(0.3, now + Math.max(duration - fadeOut, fadeIn + 0.001));
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gain.gain.linearRampToValueAtTime(0, now + duration);
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osc.start(now);
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osc.stop(now + duration);
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}
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}
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}
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function getActiveBells(stepValue) {
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const bells = [];
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for (let bit = 0; bit < 16; bit++) {
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if (stepValue & (1 << bit)) bells.push(bit + 1);
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}
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return bells;
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}
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async function decodeBsmBinary(url) {
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const token = localStorage.getItem("access_token");
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const res = await fetch(url, {
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headers: token ? { Authorization: `Bearer ${token}` } : {},
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});
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if (!res.ok) throw new Error(`Failed to fetch binary: ${res.statusText}`);
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const buf = await res.arrayBuffer();
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const view = new DataView(buf);
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const steps = [];
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for (let i = 0; i + 1 < buf.byteLength; i += 2) {
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steps.push(view.getUint16(i, false));
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}
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return steps;
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}
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// ============================================================================
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// Speed math — exponential mapping matching the Flutter app:
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// value = minSpeed * pow(maxSpeed / minSpeed, t) where t = percent / 100
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// Note: in this system, MIN ms > MAX ms (MIN = slowest, MAX = fastest).
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// ============================================================================
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function mapPercentageToSpeed(percent, minSpeed, maxSpeed) {
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if (minSpeed == null || maxSpeed == null) return null;
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const t = Math.max(0, Math.min(100, percent)) / 100;
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const a = minSpeed;
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const b = maxSpeed;
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if (a <= 0 || b <= 0) return Math.round(a + (b - a) * t);
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return Math.round(a * Math.pow(b / a, t));
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}
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// ============================================================================
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// Component
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// ============================================================================
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const BEAT_DURATION_MS = 80; // fixed tone length for playback
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const mutedStyle = { color: "var(--text-muted)" };
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const labelStyle = { color: "var(--text-secondary)" };
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export default function PlaybackModal({ open, melody, builtMelody, files, onClose }) {
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const info = melody?.information || {};
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const minSpeed = info.minSpeed || null;
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const maxSpeed = info.maxSpeed || null;
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const [steps, setSteps] = useState([]);
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const [loading, setLoading] = useState(false);
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const [loadError, setLoadError] = useState("");
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const [playing, setPlaying] = useState(false);
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const [currentStep, setCurrentStep] = useState(-1);
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const [speedPercent, setSpeedPercent] = useState(50);
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const audioCtxRef = useRef(null);
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const playbackRef = useRef(null);
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const stepsRef = useRef([]);
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const speedMsRef = useRef(500);
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// Derived speed in ms from the current percent
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const speedMs = mapPercentageToSpeed(speedPercent, minSpeed, maxSpeed) ?? 500;
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// Keep refs in sync so the playback loop reads live values
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useEffect(() => { stepsRef.current = steps; }, [steps]);
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useEffect(() => { speedMsRef.current = speedMs; }, [speedMs]);
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const stopPlayback = useCallback(() => {
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if (playbackRef.current) {
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clearTimeout(playbackRef.current.timer);
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playbackRef.current = null;
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}
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setPlaying(false);
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setCurrentStep(-1);
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}, []);
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// Load binary on open
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useEffect(() => {
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if (!open) {
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stopPlayback();
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setSteps([]);
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setCurrentStep(-1);
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setLoadError("");
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setSpeedPercent(50);
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return;
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}
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// builtMelody.binary_url is a relative path needing /api prefix;
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// files.binary_url from the /files endpoint is already a full URL path.
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const binaryUrl = builtMelody?.binary_url
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? `/api${builtMelody.binary_url}`
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: files?.binary_url || null;
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if (!binaryUrl) {
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setLoadError("No binary file available for this melody.");
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return;
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}
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setLoading(true);
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setLoadError("");
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decodeBsmBinary(binaryUrl)
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.then((decoded) => {
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setSteps(decoded);
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stepsRef.current = decoded;
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})
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.catch((err) => setLoadError(err.message))
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.finally(() => setLoading(false));
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}, [open]); // eslint-disable-line react-hooks/exhaustive-deps
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const ensureAudioCtx = () => {
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if (!audioCtxRef.current || audioCtxRef.current.state === "closed") {
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audioCtxRef.current = new (window.AudioContext || window.webkitAudioContext)();
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}
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if (audioCtxRef.current.state === "suspended") {
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audioCtxRef.current.resume();
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}
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return audioCtxRef.current;
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};
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const scheduleStep = useCallback((stepIndex) => {
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const currentSteps = stepsRef.current;
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if (!currentSteps.length) return;
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const playFrom = stepIndex % currentSteps.length;
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// End of sequence — loop back
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if (playFrom === 0 && stepIndex > 0) {
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scheduleStep(0);
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return;
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}
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const ctx = ensureAudioCtx();
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const stepValue = currentSteps[playFrom];
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setCurrentStep(playFrom);
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playStep(ctx, stepValue, BEAT_DURATION_MS);
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const timer = setTimeout(() => {
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const next = playFrom + 1;
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if (next >= stepsRef.current.length) {
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scheduleStep(0);
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} else {
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scheduleStep(next);
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}
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}, speedMsRef.current);
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playbackRef.current = { timer, stepIndex: playFrom };
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}, []); // no deps — reads everything from refs
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const handlePlay = () => {
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if (!stepsRef.current.length) return;
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setPlaying(true);
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scheduleStep(0);
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};
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const handleStop = () => {
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stopPlayback();
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};
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if (!open) return null;
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const totalSteps = steps.length;
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const allBellsUsed = steps.reduce((set, v) => {
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getActiveBells(v).forEach((b) => set.add(b));
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return set;
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}, new Set());
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const maxBell = allBellsUsed.size > 0 ? Math.max(...Array.from(allBellsUsed)) : 0;
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const currentBells = currentStep >= 0 ? getActiveBells(steps[currentStep] || 0) : [];
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const hasSpeedInfo = minSpeed != null && maxSpeed != null;
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return (
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<div
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className="fixed inset-0 flex items-center justify-center z-50"
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style={{ backgroundColor: "rgba(0,0,0,0.7)" }}
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onClick={(e) => e.target === e.currentTarget && !playing && onClose()}
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>
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<div
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className="w-full rounded-lg border shadow-xl"
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style={{
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backgroundColor: "var(--bg-card)",
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borderColor: "var(--border-primary)",
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maxWidth: "460px",
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}}
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>
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{/* Header */}
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<div
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className="flex items-center justify-between px-6 py-4 border-b"
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style={{ borderColor: "var(--border-primary)" }}
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>
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<div>
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<h2 className="text-lg font-semibold" style={{ color: "var(--text-heading)" }}>
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Melody Playback
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</h2>
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<p className="text-xs mt-0.5" style={mutedStyle}>
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{melody?.information?.name?.en || "Melody"} — looping
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</p>
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</div>
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<button
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onClick={() => { stopPlayback(); onClose(); }}
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className="text-xl leading-none"
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style={mutedStyle}
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>
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×
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</button>
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</div>
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{/* Body */}
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<div className="px-6 py-5 space-y-5">
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{/* Loading / error states */}
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{loading && (
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<p className="text-sm text-center py-4" style={mutedStyle}>Loading binary...</p>
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)}
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{loadError && (
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<div
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className="text-sm rounded-md p-3 border"
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style={{ backgroundColor: "var(--danger-bg)", borderColor: "var(--danger)", color: "var(--danger-text)" }}
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>
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{loadError}
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</div>
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)}
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{!loading && !loadError && totalSteps > 0 && (
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<>
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{/* Step info */}
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<div className="flex items-center justify-between">
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<span className="text-xs" style={mutedStyle}>
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{totalSteps} steps · {allBellsUsed.size} bell{allBellsUsed.size !== 1 ? "s" : ""}
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</span>
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{currentStep >= 0 && (
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<span className="text-xs font-mono" style={{ color: "var(--accent)" }}>
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Step {currentStep + 1} / {totalSteps}
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</span>
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)}
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</div>
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{/* Bell visualizer */}
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<div className="flex flex-wrap gap-1.5">
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{Array.from({ length: maxBell }, (_, i) => i + 1).map((b) => {
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const isActive = currentBells.includes(b);
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const isUsed = allBellsUsed.has(b);
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return (
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<div
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key={b}
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className="w-7 h-7 rounded-full flex items-center justify-center text-xs font-bold transition-all"
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style={{
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backgroundColor: isActive ? "var(--accent)" : isUsed ? "var(--bg-card-hover)" : "var(--bg-primary)",
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color: isActive ? "var(--bg-primary)" : isUsed ? "var(--text-secondary)" : "var(--border-primary)",
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border: `2px solid ${isActive ? "var(--accent)" : "var(--border-primary)"}`,
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transform: isActive ? "scale(1.2)" : "scale(1)",
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}}
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>
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{b}
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</div>
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);
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})}
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</div>
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{/* Play / Stop */}
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<div className="flex items-center gap-3">
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{!playing ? (
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<button
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onClick={handlePlay}
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className="px-5 py-2 text-sm rounded-md font-medium transition-colors"
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style={{ backgroundColor: "var(--btn-primary)", color: "var(--text-white)" }}
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>
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▶ Play
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</button>
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) : (
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<button
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onClick={handleStop}
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className="px-5 py-2 text-sm rounded-md font-medium transition-colors"
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style={{ backgroundColor: "var(--danger-btn)", color: "var(--text-white)" }}
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>
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■ Stop
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</button>
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)}
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<span className="text-xs" style={mutedStyle}>Loops continuously</span>
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</div>
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{/* Speed Slider */}
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<div>
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<div className="flex items-center justify-between mb-1.5">
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<label className="text-sm font-medium" style={labelStyle}>Speed</label>
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<div className="text-right">
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<span className="text-sm font-bold" style={{ color: "var(--accent)" }}>
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{speedPercent}%
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</span>
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{hasSpeedInfo && (
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<span className="text-xs ml-2" style={mutedStyle}>
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({speedMs} ms)
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</span>
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)}
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</div>
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</div>
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<input
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type="range"
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min="1"
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max="100"
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step="1"
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value={speedPercent}
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onChange={(e) => setSpeedPercent(Number(e.target.value))}
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className="w-full h-2 rounded-lg appearance-none cursor-pointer"
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/>
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<div className="flex justify-between text-xs mt-0.5" style={mutedStyle}>
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<span>1% (slowest)</span>
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<span>100% (fastest)</span>
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</div>
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{!hasSpeedInfo && (
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<p className="text-xs mt-1.5" style={{ color: "var(--warning, #f59e0b)" }}>
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No MIN/MAX speed set for this melody — using linear fallback.
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</p>
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)}
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</div>
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</>
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)}
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</div>
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{/* Footer */}
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<div
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className="flex justify-end px-6 py-4 border-t"
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style={{ borderColor: "var(--border-primary)" }}
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>
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<button
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onClick={() => { stopPlayback(); onClose(); }}
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className="px-4 py-2 text-sm rounded-md transition-colors"
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style={{ backgroundColor: "var(--bg-card-hover)", color: "var(--text-primary)" }}
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>
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Close
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</button>
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</div>
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</div>
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</div>
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);
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}
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