#!/usr/bin/env node
// The one report every re-arrange has to produce: how far each voice's clips had to
// be pitched, and IN WHICH DIRECTION.
//
// |shift| alone has hidden the fault twice in this project -- a p50 of 1.33 looked
// healthy while 72% of a voice was being dragged DOWN into the bass's register. So
// this prints signed counts beside the magnitudes, and the unique-clip count, which
// is what says whether a voice was starved.
//
//   node plan-shift.mjs <plan.json> [more.json ...]
import { readFileSync } from "node:fs";
import path from "node:path";
import { SONG_DATA } from "./paths.mjs";

const q = (a, p) => (a.length ? a.slice().sort((x, y) => x - y)[Math.min(a.length - 1, Math.floor(p * a.length))] : 0);

for (const file of process.argv.slice(2)) {
  const f = path.isAbsolute(file) ? file : path.join(SONG_DATA, file);
  const plan = JSON.parse(readFileSync(f, "utf8"));
  const end = Math.max(...plan.voices.flatMap((v) => v.plan.map((n) => n.slotStart + n.slotDur)));
  const start = Math.min(...plan.voices.filter((v) => v.plan.length).map((v) => v.plan[0].slotStart));
  console.log(`\n${path.basename(f)}  ${start.toFixed(2)} -> ${end.toFixed(2)}s (${(end - start).toFixed(2)}s)`);
  for (const v of plan.voices) {
    if (!v.plan.length) { console.log(`  ${v.name.padEnd(7)} EMPTY`); continue; }
    const sh = v.plan.map((n) => n.shift ?? 0);
    const abs = sh.map(Math.abs);
    const uniq = new Set(v.plan.map((n) => `${n.video}@${(+n.srcStart).toFixed(2)}`)).size;
    const down = sh.filter((s) => s < -0.05).length, up = sh.filter((s) => s > 0.05).length;
    console.log(`  ${v.name.padEnd(7)} ${String(v.plan.length).padStart(4)} notes, ${String(uniq).padStart(4)} unique  ` +
      `|shift| p50 ${q(abs, 0.5).toFixed(2)}  p90 ${q(abs, 0.9).toFixed(2)}  max ${Math.max(...abs).toFixed(2)}  ` +
      `(${down} down / ${up} up, worst down ${Math.min(...sh).toFixed(2)})`);
  }
}