#!/usr/bin/env node
import { spawnSync } from 'node:child_process';
import fs from 'node:fs';
import https from 'node:https';
import path from 'node:path';
import { fileURLToPath } from 'node:url';

import dotenv from 'dotenv';

import {
  ACCESS_KEY,
  BUCKET,
  DATA_DIR,
  HOST,
  PORT,
  SECRET_KEY,
  s3BaseUrl,
} from './config.mjs';
import { ensureCerts, installCaTrust } from './ensure-certs.mjs';
import { startServer } from './server.mjs';

const root = path.resolve(path.dirname(fileURLToPath(import.meta.url)), '../..');
dotenv.config({ path: path.join(root, '.env') });

const args = new Set(process.argv.slice(2));
const databases = args.has('--all')
  ? ['eazybusiness', 'Mandant_3']
  : [process.env.MSSQL_DATABASE || 'eazybusiness'];

const serverOnly = args.has('--server-only');
const skipTrust = args.has('--skip-trust');

function sqlcmd(query) {
  const server = process.env.MSSQL_SERVER || 'localhost';
  const port = process.env.MSSQL_PORT || '1433';
  const user = process.env.MSSQL_USER || 'sa';
  const password = process.env.MSSQL_PASSWORD || '';
  const result = spawnSync(
    'sqlcmd',
    ['-W', '-C', '-S', `${server},${port}`, '-U', user, '-P', password, '-Q', query],
    { encoding: 'utf8' }
  );
  const output = `${result.stdout || ''}${result.stderr || ''}`;
  if (result.status !== 0 || /^\s*Msg \d+,/m.test(output)) {
    throw new Error(output.trim() || 'sqlcmd failed');
  }
  return result.stdout;
}

function timestamp() {
  return new Date().toISOString().replace(/[:.]/g, '-');
}

async function waitForServer() {
  for (let i = 0; i < 40; i++) {
    const ok = await new Promise((resolve) => {
      const req = https.request(
        { host: HOST, port: PORT, path: '/', method: 'GET', rejectUnauthorized: false },
        (res) => {
          res.resume();
          resolve(res.statusCode === 403 || res.statusCode === 200);
        }
      );
      req.on('error', () => resolve(false));
      req.end();
    });
    if (ok) return;
    await new Promise((r) => setTimeout(r, 250));
  }
  throw new Error(`S3 endpoint did not start on https://${HOST}:${PORT}`);
}

function ensureCredential() {
  const cred = s3BaseUrl();
  sqlcmd(`
IF EXISTS (SELECT 1 FROM sys.credentials WHERE name = N'${cred}')
  DROP CREDENTIAL [${cred}];
CREATE CREDENTIAL [${cred}]
WITH IDENTITY = 'S3 Access Key',
     SECRET = '${ACCESS_KEY}:${SECRET_KEY}';
`);
}

function backupDatabase(db) {
  const file = `${db}-${timestamp()}.bak`;
  const url = `${s3BaseUrl()}/${file}`;
  console.log(`Backing up ${db} -> ${url}`);
  sqlcmd(`
BACKUP DATABASE [${db}]
TO URL = '${url}'
WITH FORMAT, COMPRESSION, STATS = 10;
`);
  const onDisk = path.join(DATA_DIR, file);
  if (!fs.existsSync(onDisk)) {
    throw new Error(`Backup finished but file missing on disk: ${onDisk}`);
  }
  const mb = (fs.statSync(onDisk).size / (1024 * 1024)).toFixed(1);
  console.log(`Saved ${onDisk} (${mb} MB)`);
  return onDisk;
}

async function main() {
  ensureCerts(HOST);
  if (!skipTrust) {
    const trusted = installCaTrust();
    if (!trusted) {
      console.warn('Could not install CA into MSSQL container. Run:');
      console.warn(`  docker cp scripts/s3-backup/certs/ca.pem mssql:/tmp/jtlsrv-s3-ca.pem`);
      console.warn('  docker exec mssql bash -lc "cp /tmp/jtlsrv-s3-ca.pem /usr/local/share/ca-certificates/jtlsrv-s3.crt && update-ca-certificates"');
    } else {
      console.log('Installed S3 CA into MSSQL container');
    }
  }

  await startServer();
  await waitForServer();

  if (serverOnly) {
    console.log('Server running (--server-only). Ctrl+C to stop.');
    return;
  }

  ensureCredential();
  const saved = [];
  for (const db of databases) {
    saved.push(backupDatabase(db));
  }

  console.log('\nBackups on disk:');
  for (const file of saved) {
    console.log(`  ${file}`);
  }
}

if (args.has('--help')) {
  console.log(`Usage: node scripts/s3-backup/backup.mjs [options]

Starts a local S3-compatible HTTPS endpoint and backs up MSSQL to disk.

Options:
  --all          Backup eazybusiness and Mandant_3
  --server-only  Start endpoint only, no backup
  --skip-trust   Skip installing CA cert into system trust store

Reads MSSQL_* from .env in repo root.
Backups land in scripts/s3-backup/data/${BUCKET}/
`);
  process.exit(0);
}

main().catch((err) => {
  console.error(err.message || err);
  process.exit(1);
});