#!/usr/bin/env node

import crypto from 'node:crypto';
import path from 'node:path';
import { pathToFileURL } from 'node:url';

import { initDatabase } from '../src/db.js';
import { maildirRootFromEnvironment } from '../src/maildir-store.js';
import { migrateInboundMessagesToMaildir } from '../src/maildir-sync.js';
import { loadMailHubEnvironment } from './import-vesta-maildir.js';

export async function runSqliteMaildirMigration({ env = process.env, output = process.stdout } = {}) {
  loadMailHubEnvironment({ env });
  const dataDir = path.resolve(env.DATA_DIR || path.join(process.cwd(), 'data'));
  const maildirRoot = maildirRootFromEnvironment(env);
  const secret = String(env.SESSION_SECRET || crypto
    .createHash('sha256')
    .update(`${env.ADMIN_PASSWORD || 'change-this-admin-password'}:${env.API_TOKEN || ''}`)
    .digest('hex'));
  initDatabase(dataDir, secret);

  let lastReported = 0;
  const report = await migrateInboundMessagesToMaildir({
    root: maildirRoot,
    onProgress(progress) {
      if (progress.processed - lastReported < 250) return;
      lastReported = progress.processed;
      output.write(`Maildir migration progress: processed=${progress.processed} written=${progress.written} reused=${progress.reused}\n`);
    }
  });
  output.write(`Maildir migration complete: processed=${report.processed} written=${report.written} reused=${report.reused}\n`);
  return report;
}

function isMainModule() {
  const scriptPath = process.argv[1] ? path.resolve(process.argv[1]) : '';
  return scriptPath && import.meta.url === pathToFileURL(scriptPath).href;
}

if (isMainModule()) {
  runSqliteMaildirMigration().catch((error) => {
    console.error(`Maildir migration failed: ${error.message || error}`);
    process.exitCode = 1;
  });
}