import commander from 'commander';
import chalk from 'chalk';
import path from 'path';
import fs from 'fs';
import Enquirer from 'enquirer';
import { isValidProjectName, getVersion, yarnExists } from './utils';
import { Generator } from './generator';
import { Options } from './types';

const { exit } = process;

const cancel = (): void => {
  console.log(chalk.gray.bold('\nProject initialization was canceled.'));
  exit();
};

const createRXApp = async (
  projectName: string | undefined,
  options: Options,
) => {
  if (!projectName) {
    console.log(chalk.red('Project name cannot be empty.'));
    return exit();
  }

  if (!isValidProjectName(projectName)) {
    console.log(
      chalk.red(`Project name - ${chalk.red.bold(projectName)} is not valid.`),
    );
    return exit();
  }

  if (fs.existsSync(projectName)) {
    try {
      const { useExistingDir } = await Enquirer.prompt<{
        useExistingDir: boolean;
      }>({
        message: chalk.yellow.bold(
          `Directory ${chalk.red.bold(
            projectName,
          )} is already exists. Continue?`,
        ),
        initial: false,
        name: 'useExistingDir',
        type: 'confirm',
      });

      if (!useExistingDir) {
        return cancel();
      }
    } catch {
      return cancel();
    }
  }

  new Generator({
    projectName,
    projectPath: path.join(process.cwd(), projectName),
    ...options,
  }).run();
};

const program = new commander.Command('create-rx-app')
  .arguments('<project-directory>')
  .usage(`${chalk.green.bold('<project-directory>')} [options]`)
  .option('--javascript', 'generate project in JavaScript')
  .option('--skip-install', `don't automatically install dependencies`)
  .option('--skip-jest', `don't automatically add Jest configuration`)
  .option('--skip-yarn', `don't use Yarn for managing dependencies`)
  .version(chalk.white.bold(getVersion()), '-v, --version')
  .allowUnknownOption()
  .parse(process.argv);

if (!program.args.length) {
  program.help();
}

const options = program.opts();

createRXApp(program.args.shift(), {
  javascript: !!options.javascript,
  skipInstall: !!options.skipInstall,
  skipJest: !!options.skipJest,
  yarn: !options.skipYarn && yarnExists(),
});