import { execSync } from 'child_process';
import { platform } from 'os';
import * as chalk from 'chalk';
import { GeneratorCallback, logger } from '@nrwl/devkit';

const podInstallErrorMessage = `
Running ${chalk.bold('pod install')} failed, see above.
Do you have CocoaPods (https://cocoapods.org/) installed?

Check that your XCode path is correct:
${chalk.bold('sudo xcode-select --print-path')}

If the path is wrong, switch the path: (your path may be different)
${chalk.bold('sudo xcode-select --switch /Applications/Xcode.app')}
`;

/**
 * Run pod install on ios directory
 * @param iosDirectory ios directory that contains Podfile
 * @returns resolve with 0 if not error, reject with error otherwise
 */
export function runPodInstall(
  iosDirectory: string,
  install: boolean = true
): GeneratorCallback {
  return () => {
    if (platform() !== 'darwin') {
      logger.info('Skipping `pod install` on non-darwin platform');
      return;
    }

    if (!install) {
      logger.info('Skipping `pod install`');
      return;
    }

    logger.info(`Running \`pod install\` from "${iosDirectory}"`);

    return podInstall(iosDirectory);
  };
}

export function podInstall(iosDirectory: string): Promise<void> {
  return new Promise((resolve, reject) => {
    const result = execSync('pod install', {
      cwd: iosDirectory,
    });
    logger.info(result.toString());
    if (result.toString().includes('Pod installation complete')) {
      resolve();
    } else {
      reject(new Error(podInstallErrorMessage));
    }
  });
}