import fs from "fs";
import path from "path";

export function discoverSavedTorrents(downloadDir) {
  if (!downloadDir || !fs.existsSync(downloadDir)) return [];
  const entries = fs.readdirSync(downloadDir, { withFileTypes: true });
  const folders = entries.filter((e) => e.isDirectory()).map((e) => e.name);
  const candidates = [];

  for (const name of folders) {
    const savePath = path.join(downloadDir, name);
    const infoPath = path.join(savePath, "info.json");
    if (!fs.existsSync(infoPath)) continue;
    try {
      const info = JSON.parse(fs.readFileSync(infoPath, "utf-8"));
      const magnetURI = info.magnetURI || info.magnet || null;
      const infoHash = info.infoHash || null;
      candidates.push({
        folder: name,
        savePath,
        infoPath,
        infoHash,
        magnetURI,
        added: info.added || fs.statSync(infoPath).mtimeMs,
        name: info.name || name
      });
    } catch (err) {
      console.warn(`⚠️ info.json okunamadı (${infoPath}): ${err.message}`);
    }
  }
  return candidates;
}

export function restoreTorrentsFromDisk({ downloadDir, client, register }) {
  const candidates = discoverSavedTorrents(downloadDir);
  const restored = [];

  for (const candidate of candidates) {
    if (!candidate.magnetURI) {
      console.warn(`⚠️ ${candidate.folder} için magnetURI yok, atlanıyor.`);
      continue;
    }
    try {
      const torrent = client.add(candidate.magnetURI, {
        path: candidate.savePath,
        announce: []
      });
      if (typeof register === "function") {
        register(torrent, {
          savePath: candidate.savePath,
          added: candidate.added,
          restored: true
        });
      }
      restored.push({ infoHash: torrent.infoHash || candidate.infoHash, folder: candidate.folder });
    } catch (err) {
      console.warn(`⚠️ ${candidate.folder} yeniden eklenemedi: ${err.message}`);
    }
  }
  return restored;
}