// LearnPlay adaptation tooling, MIT. Run: node addons/vendor/beepbox/compile-csp.mjs
// Only three known instruments are supported. Do not add arbitrary song imports.
import fs from 'node:fs';
import vm from 'node:vm';
const root = new URL('./', import.meta.url);
const original = fs.readFileSync(new URL('global/beepbox_synth.js', root), 'utf8');
const functions = new Map();
function capture(...args) {
  const body = args.at(-1);
  functions.set(body, args);
  return Function(...args);
}
const sandbox = { console, Function: capture, performance };
vm.createContext(sandbox);
vm.runInContext(original, sandbox);
const { Song, Synth } = sandbox.beepbox;
const instruments = [
  {type: 'chip', wave: 'triangle', volume: 65, effects: []},
  {type: 'chip', wave: 'square', volume: 30, effects: []},
  {type: 'noise', wave: 'retro', volume: 45, effects: []},
];
for (const [i, instrument] of instruments.entries()) {
  const song = new Song();
  song.fromJsonObject({format:'BeepBox', version:9, key:'C', beatsPerBar:4, ticksPerBeat:4, beatsPerMinute:100, introBars:0, loopBars:1,
    channels:[{type:i === 2 ? 'drum':'pitch', instruments:[instrument], patterns:[{notes:[{pitches:[i===2?4:36],points:[{tick:0,pitchBend:0,volume:100},{tick:16,pitchBend:0,volume:0}]}]}],sequence:[1]}]});
  const synth = new Synth(song);
  for (let block=0; block<30; block++) synth.synthesize(new Float32Array(4096),new Float32Array(4096),4096,true);
}
function hash(s) { let h=2166136261; for(let i=0;i<s.length;i++) h=Math.imul(h^s.charCodeAt(i),16777619); return (h>>>0).toString(36); }
const seen = new Set();
const entries = [...functions].map(([body,args]) => {
  const key=hash(body); if(seen.has(key)) throw Error('Hash collision'); seen.add(key);
  return JSON.stringify(key)+': function('+args.slice(0,-1).join(',')+') {\n'+body+'\n}';
});
const prefix = '// BeepBox 4.2.0 by John Nesky, MIT (LICENSE.md).\n// LearnPlay CSP adaptation: precompiled fixed instrument functions; no runtime eval.\n'+
  'var beepboxStaticFunctions={'+entries.join(',\n')+'};\n'+
  'function beepboxStaticFunction(...args){const body=args[args.length-1];let h=2166136261;for(let i=0;i<body.length;i++)h=Math.imul(h^body.charCodeAt(i),16777619);const fn=beepboxStaticFunctions[(h>>>0).toString(36)];if(!fn)throw Error("Unsupported BeepBox instrument configuration");return fn;}\n';
const compiled = prefix + original.replace(/new Function\(/g,'beepboxStaticFunction(').replace(/\/\/# sourceMappingURL=.*$/m,'');
fs.writeFileSync(new URL('beepbox-csp.js',root),compiled);
console.log('Compiled '+functions.size+' static DSP factories; '+compiled.length+' bytes.');