Deduplicating a Messy Music Library with ISRC

import fs from "node:fs";

const API_KEY = process.env.SONOVAULT_API_KEY!;
const BASE    = "https://api.sonovault.now/v1";
const BATCH   = 100;

interface LibraryRow { id: string; isrc?: string; title: string; duration: number; }

async function resolveBatch(isrcs: string[]) {
  const res = await fetch(`${BASE}/tracks/resolve`, {
    method:  "POST",
    headers: { "x-api-key": API_KEY, "content-type": "application/json" },
    body:    JSON.stringify({ input_type: "isrc", items: isrcs }),
  });
  return (await res.json()).results;
}

const rows: LibraryRow[] = JSON.parse(fs.readFileSync("./library.json", "utf-8"));

// 1. Build a map of (your row ID) → (canonical SonoVault track ID).
const rowToTrack = new Map<string, number>();
const withIsrc   = rows.filter(r => r.isrc);

for (let i = 0; i < withIsrc.length; i += BATCH) {
  const chunk   = withIsrc.slice(i, i + BATCH);
  const results = await resolveBatch(chunk.map(r => r.isrc!));

  chunk.forEach((row, j) => {
    const track = results[j]?.track;
    if (track) rowToTrack.set(row.id, track.id);
  });
}

// 2. Group rows by canonical track ID. Each group is one recording.
const groups = new Map<number, LibraryRow[]>();
for (const row of rows) {
  const trackId = rowToTrack.get(row.id);
  if (!trackId) continue; // unresolved — leave standalone
  if (!groups.has(trackId)) groups.set(trackId, []);
  groups.get(trackId)!.push(row);
}

// 3. For each group with >1 row, pick a winner. Here: longest duration wins.
const winners: LibraryRow[] = [];
const losers:  LibraryRow[] = [];

for (const group of groups.values()) {
  if (group.length === 1) {
    winners.push(group[0]);
    continue;
  }
  const sorted = [...group].sort((a, b) => b.duration - a.duration);
  winners.push(sorted[0]);
  losers.push(...sorted.slice(1));
}

console.log(`${rows.length} input rows → ${winners.length} unique recordings (${losers.length} duplicates)`);
fs.writeFileSync("./library.deduped.json", JSON.stringify(winners, null, 2));
fs.writeFileSync("./library.duplicates.json", JSON.stringify(losers,  null, 2));