import assert from 'node:assert/strict';
import fs from 'node:fs';
import vm from 'node:vm';
import { getRtwCenters } from '../www/core/rtw_centers.js';
import { selectLocalRtwPacket } from '../www/views/realtime.js';

const source = fs.readFileSync(new URL('../www/core/audio.js', import.meta.url), 'utf8');
const functionSource = source.match(/export function buildRtaRuntimeConfig[\s\S]*?\n\}/)?.[0];
assert.ok(functionSource, 'buildRtaRuntimeConfig must remain testable');
const context = vm.createContext({
  Number,
  getRtwCenters(mode) {
    if (mode === '1_12') return new Array(121).fill(0);
    if (mode === '1_6') return new Array(61).fill(0);
    return new Array(31).fill(0);
  },
});
vm.runInContext(functionSource.replace('export function', 'function'), context);

const forced = context.buildRtaRuntimeConfig({
  RTA_BAR_LAYOUT: 'rtw',
  RTA_ENGINE: 'fft',
  RTA_BPO_MODE: '1_12',
  RTA_FREQ_RANGE: 'lf',
  RTA_IIR_ORDER: 2,
  RTA_DETECTOR: 'peak',
  RTA_PEAK_HOLD_MODE: 'fall',
  RTA_PEAK_HOLD_SEC: 4,
  RTA_PEAK_DECAY_DB_PER_S: 20,
  RTA_PEAK_RESET_TOKEN: 9,
  CORR_RESPONSE_S: 2.5,
  CORR_RESET_TOKEN: 7,
  XY_POINTS: 256,
});
assert.equal(forced.engine, 'iir');
assert.equal(forced.bpo, '1_12');
assert.equal(forced.freqRange, 'norm');
assert.equal(forced.order, 6);
assert.equal(forced.detector, 'peak');
assert.equal(forced.rtaPeakHoldMode, 'fall');
assert.equal(forced.rtaPeakHoldSeconds, 4);
assert.equal(forced.rtaPeakDecayDbPerSecond, 20);
assert.equal(forced.rtaPeakResetToken, 9);
assert.equal(forced.tauFast, 0.125);
assert.equal(forced.rtwCenters.length, 121);
assert.equal(forced.correlationResponseS, 2.5);
assert.equal(forced.correlationResetToken, 7);
assert.equal(forced.xyPoints, 256);

const extension = context.buildRtaRuntimeConfig({
  RTA_BAR_LAYOUT: 'iec',
  RTA_ENGINE: 'fft',
  RTA_BPO_MODE: '1_12',
  RTA_FREQ_RANGE: 'lf',
  RTA_IIR_ORDER: 8,
});
assert.equal(extension.engine, 'fft');
assert.equal(extension.bpo, '1_12');
assert.equal(extension.freqRange, 'lf');
assert.equal(extension.order, 8);

const configSource = fs.readFileSync(new URL('../www/core/config.js', import.meta.url), 'utf8');
const selectionSource = configSource.match(/function applyRtaBpoSelection[\s\S]*?\n\}/)?.[0];
assert.ok(selectionSource, 'RTA BPO selection policy must remain testable');
const selectionContext = vm.createContext({
  String,
  CONFIG: { RTA_BPO_MODE: '1_3', RTA_BAR_LAYOUT: 'rtw' },
});
vm.runInContext(selectionSource, selectionContext);
assert.equal(selectionContext.applyRtaBpoSelection('1_6'), '1_6');
assert.equal(selectionContext.CONFIG.RTA_BPO_MODE, '1_6');
assert.equal(selectionContext.CONFIG.RTA_BAR_LAYOUT, 'rtw');
assert.equal(selectionContext.applyRtaBpoSelection('1_3'), '1_3');
assert.equal(selectionContext.CONFIG.RTA_BAR_LAYOUT, 'rtw');

const twelfthCenters = getRtwCenters('1_12');
const staleTwelfthPacket = {
  engine: 'iir',
  bpo: '1_12',
  centers: twelfthCenters,
  bands_avg: twelfthCenters.map((_, index) => index),
  bands_peak: twelfthCenters.map((_, index) => index + 1000),
};
const selectedSixth = selectLocalRtwPacket(staleTwelfthPacket, '1_6');
assert.equal(selectedSixth.bpo, '1_6');
assert.equal(selectedSixth.centers.length, getRtwCenters('1_6').length);
assert.equal(selectedSixth.bands_avg.length, selectedSixth.centers.length);
assert.equal(selectedSixth.bands_peak.length, selectedSixth.centers.length);

console.log('RTA profile regression tests passed');