import { readFile } from 'fs/promises';

import { getArg } from './lib/args.js';
import { getMany } from './lib/dl.js';
import { error, log } from './lib/log.js';

const ctx = 'downloadDb.js';

/**
 * Downloads all media possible for the users stored in db.json at the specified `--path`.
 * Useful for first run or for augmenting existing media
 * if it may be only partially archived in an uncertain state.
 */
const downloadDb = async () => {
  log(ctx, 'Grabbing db');
  let directory = '', threadMax = 1, db;
  try {
    directory = getArg('path');
  } catch (err) {
    error(ctx, err);
    return;
  }
  try {
    threadMax = getArg('threads');
    log(ctx, `Using ${threadMax} threads`);
  } catch (err) {
    log(ctx, 'Using 1 thread');
  }
  try {
    let file = await readFile(`${directory}/db.json`, { encoding: 'utf8' });
    db = JSON.parse(file);
  } catch (err) {
    error(ctx, err);
    return;
  }

  let processes = db.map(entry => ({
    ...entry,
    logs: [],
  }));

  log(ctx, `Building db using <user>/media for ${processes.length} users`);
  await getMany(processes, threadMax, directory);

  log(ctx, 'Building db using /search');
}

downloadDb();