import * as fs from 'fs';
import * as path from 'path';
import * as io from '@actions/io';
import * as exec from '@actions/exec';
import * as tc from '@actions/tool-cache';
import * as util from './util';
import {ExecOptions} from '@actions/exec/lib/interfaces';

export const PRIVATE_KEY_FILE = path.join(util.getTempDir(), 'private-key.asc');
export const ADOPTIUM_SIGNATURE_KEY_FINGERPRINT =
  '3B04D753C9050D9A5D343F39843C48A565F8F04B';

const PRIVATE_KEY_FINGERPRINT_REGEX = /\w{40}/;

export async function importKey(privateKey: string) {
  fs.writeFileSync(PRIVATE_KEY_FILE, privateKey, {
    encoding: 'utf-8',
    flag: 'w'
  });

  let output = '';

  const options: ExecOptions = {
    silent: true,
    listeners: {
      stdout: (data: Buffer) => {
        output += data.toString();
      }
    }
  };

  await exec.exec(
    'gpg',
    [
      '--batch',
      '--import-options',
      'import-show',
      '--import',
      PRIVATE_KEY_FILE
    ],
    options
  );

  await io.rmRF(PRIVATE_KEY_FILE);

  const match = output.match(PRIVATE_KEY_FINGERPRINT_REGEX);
  return match && match[0];
}

export async function deleteKey(keyFingerprint: string) {
  await exec.exec(
    'gpg',
    ['--batch', '--yes', '--delete-secret-and-public-key', keyFingerprint],
    {
      silent: true
    }
  );
}

export async function verifyPackageSignature(
  archivePath: string,
  signatureUrl: string,
  keyFingerprint = ADOPTIUM_SIGNATURE_KEY_FINGERPRINT
) {
  const signaturePath = await tc.downloadTool(signatureUrl);
  const gpgHome = fs.mkdtempSync(
    path.join(util.getTempDir(), 'verify-signature-gpg-home-')
  );
  const env = {...process.env, GNUPGHOME: gpgHome};

  try {
    const options: ExecOptions = {silent: true, env};
    await exec.exec(
      'gpg',
      [
        '--batch',
        '--keyserver',
        'keyserver.ubuntu.com',
        '--recv-keys',
        keyFingerprint
      ],
      options
    );
    await exec.exec(
      'gpg',
      ['--batch', '--verify', signaturePath, archivePath],
      options
    );
  } finally {
    await io.rmRF(signaturePath);
    await io.rmRF(gpgHome);
  }
}