// Node-only: WAV -> analysis -> song. The browser does the same with a
// decoded AudioBuffer; this keeps the tools honest about the same pipeline.

import { readFileSync } from 'node:fs';
import { decodeWav, mono } from '../src/audio/wav.js';
import { analyse } from '../src/audio/analyse.js';
import { buildSong } from '../src/song/song.js';

export function loadSong(path, { fps = 30, seed = 12345 } = {}) {
    const wav = decodeWav(readFileSync(path));
    if (!wav) throw new Error(`not a WAV: ${path}`);
    const pcm = mono(wav.channels);
    const analysis = analyse(pcm, wav.sampleRate, { fps });
    const song = buildSong(analysis, seed);
    return { pcm, sampleRate: wav.sampleRate, analysis, song, name: path.split('/').pop().replace(/\.wav$/i, '') };
}