#!/usr/bin/env node

/**
 * Copyright (c) 2017-present, Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the BSD-style license found in the
 * LICENSE file in the root directory of this source tree. An additional grant
 * of patent rights can be found in the PATENTS file in the same directory.
 */

const shell = require('shelljs');

const GIT_USER = process.env.GIT_USER;
const CIRCLE_BRANCH = process.env.CIRCLE_BRANCH;
const CIRCLE_PROJECT_USERNAME = process.env.CIRCLE_PROJECT_USERNAME;
const CIRCLE_PROJECT_REPONAME = process.env.CIRCLE_PROJECT_REPONAME;
const CI_PULL_REQUEST = process.env.CI_PULL_REQUEST;
const remoteBranch = `https://${GIT_USER}@github.com/${CIRCLE_PROJECT_USERNAME}/${CIRCLE_PROJECT_REPONAME}.git`;


if (!shell.which('git')) {
  shell.echo('Sorry, this script requires git');
  shell.exit(1);
}

if (CI_PULL_REQUEST || CIRCLE_BRANCH !== `master`) {
  shell.echo('Skipping deploy');
  shell.exit(0);
}

if (shell.exec('docusaurus-build').code) {
  shell.echo('Error: generating html failed');
  shell.exit(1);
}

shell.cd(__dirname);
shell.cd('..');
shell.cd('build');

if (shell.exec(`git clone ${remoteBranch} ${CIRCLE_PROJECT_REPONAME}-gh-pages`).code !== 0) {
  shell.echo('Error: git clone failed');
  shell.exit(1);
}

shell.cd(`${CIRCLE_PROJECT_REPONAME}-gh-pages`);

if (shell.exec('git checkout origin/gh-pages').code +
    shell.exec('git checkout -b gh-pages').code +
    shell.exec('git branch --set-upstream-to=origin/gh-pages').code !== 0
    ) {
  shell.echo('Error: Git checkout gh-pages failed');
  shell.exit(1);
}

shell.exec('rm -rf *');

shell.cd('../..');

shell.cp('-R', `build/${CIRCLE_PROJECT_REPONAME}/*`, `build/${CIRCLE_PROJECT_REPONAME}-gh-pages/`);
shell.cd(`build/${CIRCLE_PROJECT_REPONAME}-gh-pages`);

shell.exec('git add --all');
shell.exec('git commit -m "update website [ci skip]"');
if (shell.exec('git push origin gh-pages').code !== 0) {
  shell.echo('Error: Git push failed');
  shell.exit(1);
} else {
  shell.echo(`Website is live at: https://${CIRCLE_PROJECT_USERNAME}.github.io/${CIRCLE_PROJECT_REPONAME}/`);
  shell.exit(0);
}