import { expect, tap } from '@git.zone/tstest/tapbundle';
import * as smartssh from '../ts/index.js';
import fs from 'fs-extra';
import type { AddressInfo } from 'net';
import * as path from 'path';
import ssh2 from 'ssh2';
import type { Server as TSsh2Server } from 'ssh2';

const { Server, utils } = ssh2;

const testDir = path.join(process.cwd(), '.nogit/test/temp');
const configPath = path.join(testDir, 'config');

let testSshInstance: smartssh.SshInstance;
let testSshKey: smartssh.SshKey;
let testSshServer: TSsh2Server;
let testSshServerPort: number;

const createTestSshServer = async () => {
  const hostKeys = [utils.generateKeyPairSync('ed25519').private];
  const server = new Server({ hostKeys }, (client) => {
    client.on('authentication', (ctx) => {
      if (ctx.method === 'password' && ctx.username === 'tester' && ctx.password === 'secret') {
        ctx.accept();
        return;
      }
      ctx.reject();
    });

    client.on('ready', () => {
      client.on('session', (accept) => {
        const session = accept();
        session.on('exec', (acceptExec, _rejectExec, info) => {
          const stream = acceptExec();
          if (info.command === 'printf smartssh') {
            stream.write('smartssh\n');
            stream.stderr.write('warn\n');
            stream.exit(0);
            stream.end();
            return;
          }

          stream.stderr.write(`unknown command: ${info.command}\n`);
          stream.exit(127);
          stream.end();
        });
      });
    });
  });

  await new Promise<void>((resolve) => server.listen(0, '127.0.0.1', () => resolve()));
  const address = server.address() as AddressInfo;
  return {
    server,
    port: address.port,
  };
};

tap.test('should prepare a clean test directory', async () => {
  await fs.emptyDir(testDir);
});

tap.test('should create a valid SshKey object', async () => {
  testSshKey = new smartssh.SshKey({
    host: 'example.com',
    private: 'someExamplePrivateKey',
    public: 'someExamplePublicKey',
  });
  expect(testSshKey).toBeInstanceOf(smartssh.SshKey);
});
tap.test('.type should be a valid type', async () => {
  expect(testSshKey.type).toEqual('duplex');
});
tap.test('.publicKey should be public key', async () => {
  expect(testSshKey.pubKey).toEqual('someExamplePublicKey');
});
tap.test('.privateKey should be private key', async () => {
  expect(testSshKey.privKey).toEqual('someExamplePrivateKey');
});
tap.test('.publicKeyBase64 should be public key base 64 encoded', async () => {
  // tslint:disable-next-line:no-unused-expression
  testSshKey.pubKeyBase64;
});
tap.test('.store() should store the file to disk', async () => {
  await testSshKey.store(testDir);
  const privateKeyMode = (await fs.stat(path.join(testDir, 'example.com'))).mode & 0o777;
  const publicKeyMode = (await fs.stat(path.join(testDir, 'example.com.pub'))).mode & 0o777;
  expect(privateKeyMode).toEqual(0o600);
  expect(publicKeyMode).toEqual(0o644);
});
tap.test('.store() should reject unsafe host aliases', async () => {
  expect(() => {
    new smartssh.SshKey({
      host: '../evil',
      private: 'somePrivateKey',
    });
  }).toThrow();
});

// SSH INstance
tap.test("'new' keyword should create a new SshInstance object from class", async () => {
  testSshInstance = new smartssh.SshInstance({
    sshDirPath: testDir,
  });
  expect(testSshInstance).toBeInstanceOf(smartssh.SshInstance);
});
tap.test('.addKey() should accept a new SshKey object', async () => {
  testSshInstance.addKey(
    new smartssh.SshKey({
      public: 'somePublicKey',
      private: 'somePrivateKey',
      host: 'gitlab.com',
    })
  );
  testSshInstance.addKey(
    new smartssh.SshKey({
      public: 'somePublicKey',
      private: 'somePrivateKey',
      host: 'bitbucket.org',
    })
  );
  testSshInstance.addKey(
    new smartssh.SshKey({
      public: 'someGitHubPublicKey',
      private: 'someGitHubPrivateKey',
      host: 'github.com',
    })
  );
});

tap.test('.sshKeys should point to an array of sshKeys', async () => {
  let sshKeyArray = testSshInstance.sshKeys;
  expect(sshKeyArray).toBeInstanceOf(Array);
  expect(sshKeyArray[0].host).toEqual('gitlab.com');
  expect(sshKeyArray[1].host).toEqual('bitbucket.org');
  expect(sshKeyArray[2].host).toEqual('github.com');
});

tap.test('.getKey() should get a specific key selected by host', async () => {
  const sshKey = testSshInstance.getKey('github.com');
  expect(sshKey).toBeInstanceOf(smartssh.SshKey);
  expect(sshKey?.pubKey).toEqual('someGitHubPublicKey');
});

tap.test('.removeKey() should remove a key', async () => {
  const sshKey = testSshInstance.getKey('bitbucket.org');
  expect(sshKey).toBeInstanceOf(smartssh.SshKey);
  testSshInstance.removeKey(sshKey!);
  expect(testSshInstance.sshKeys[1].host).toEqual('github.com');
});

tap.test('it should store to disk', async () => {
  testSshInstance.writeToDisk();
  const config = await fs.readFile(configPath, 'utf8');
  expect(config).toInclude(`IdentityFile ${path.join(testDir, 'github.com')}`);
  expect(config).toInclude('StrictHostKeyChecking yes');
  expect(config).not.toInclude('StrictHostKeyChecking no');
});

tap.test('it should read keys back from disk', async () => {
  const readBackInstance = new smartssh.SshInstance({ sshDirPath: testDir });
  readBackInstance.readFromDisk();
  const githubKey = readBackInstance.getKey('github.com');
  expect(githubKey).toBeInstanceOf(smartssh.SshKey);
  expect(githubKey?.privKey).toEqual('someGitHubPrivateKey');
  expect(githubKey?.pubKey).toEqual('someGitHubPublicKey');
});

tap.test('SshClient should require host validation by default', async () => {
  let strictHostError: Error | undefined;
  try {
    await smartssh.SshClient.connect({
      host: '127.0.0.1',
      username: 'tester',
    });
  } catch (error) {
    strictHostError = error as Error;
  }
  expect(strictHostError?.message).toInclude('strictHostKeyChecking');
});

tap.test('SshClient should execute a command over a real SSH server', async () => {
  const testServer = await createTestSshServer();
  testSshServer = testServer.server;
  testSshServerPort = testServer.port;

  const sshClient = await smartssh.SshClient.connect({
    host: '127.0.0.1',
    port: testSshServerPort,
    username: 'tester',
    password: 'secret',
    strictHostKeyChecking: false,
  });
  const result = await sshClient.exec('printf smartssh');
  await sshClient.close();

  expect(result.code).toEqual(0);
  expect(result.stdout).toEqual('smartssh\n');
  expect(result.stderr).toEqual('warn\n');
});

tap.test('should close the real SSH test server', async () => {
  await new Promise<void>((resolve, reject) => {
    testSshServer.close((error?: Error) => {
      if (error) {
        reject(error);
        return;
      }
      resolve();
    });
  });
});

export default tap.start();