/**
 * Copyright (c) 2015-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.
 */
'use strict';

var semverCmp = require('semver-compare');

const {
  cd,
  cp,
  echo,
  exec,
  exit,
  ls,
  mkdir,
  rm,
  which,
} = require('shelljs');

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

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

let version;
let areVersionlessSectionsToBeDeployed = false;
if (CIRCLE_BRANCH.indexOf('-stable') !== -1) {
  version = CIRCLE_BRANCH.slice(0, CIRCLE_BRANCH.indexOf('-stable'));
} else if (CIRCLE_BRANCH === 'master') {
  version = 'next';
  areVersionlessSectionsToBeDeployed = true;
}

rm('-rf', 'build');
mkdir('-p', 'build');
// if current commit is tagged "latest" we do a release to gh-pages root
const currentCommit = exec('git rev-parse HEAD').stdout.trim();
const latestTagCommit = exec('git ls-remote origin latest').stdout.split(/\s/)[0];
// pass along which branch contains latest version so that gh-pages root could mark it as latest
const branchWithLatestTag = exec(`git branch -r --contains ${latestTagCommit}`).stdout.split('/')[1];
let latestVersion = '';
if (branchWithLatestTag.indexOf('-stable') !== -1) {
  latestVersion = branchWithLatestTag.slice(0, branchWithLatestTag.indexOf('-stable'));
}

if (!CI_PULL_REQUEST && CIRCLE_PROJECT_USERNAME === 'facebook') {
  echo(`Building branch ${version}, preparing to push to gh-pages`);
  // if code is running in a branch in CI, commit changes to gh-pages branch
  cd('build');
  rm('-rf', 'react-native-gh-pages');

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

  cd('react-native-gh-pages');

  if (exec('git checkout origin/gh-pages').code +
    exec('git checkout -b gh-pages').code +
    exec('git branch --set-upstream-to=origin/gh-pages').code !== 0
    ) {
    echo('Error: Git checkout gh-pages failed');
    exit(1);
  }
  cd('releases');
  let releasesFolders = ls('-d', '*');
  cd('..');
  let versions = releasesFolders.filter(name => name !== 'next');
  if (version !== 'next' && versions.indexOf(version) === -1) {
    versions.push(version);
  }

  versions.sort(semverCmp).reverse();

  // generate to releases/XX when branch name indicates that it is some sort of release
  if (version) {
    echo(`------------ DEPLOYING /releases/${version}`);
    rm('-rf', `releases/${version}`);
    mkdir('-p', `releases/${version}`);
    cd('../..');
    if (exec(`RN_DEPLOYMENT_PATH=releases/${version} RN_VERSION=${version} RN_LATEST_VERSION=${latestVersion} \
    RN_AVAILABLE_DOCS_VERSIONS=${versions.join(',')} node server/generate.js`).code !== 0) {
      echo('Error: Generating HTML failed');
      exit(1);
    }
    cd('build/react-native-gh-pages');
    // blog, showcase, support are copied separately
    let toCopy = ls('../react-native')
      .filter(file => (file !== 'blog') && (file !== 'showcase.html') && (file !== 'support.html'))
      .map(file => `../react-native/${file}`);
    cp('-R', toCopy, `releases/${version}`);
    // versions.html is located in root of website and updated with every release
    cp('../react-native/versions.html', '.');
  }
  // generate to root folder when commit is tagged as latest, i.e. stable and needs to be shown at the root of repo
  if (currentCommit === latestTagCommit) {
    echo('------------ DEPLOYING latest');
    // leave only releases and blog folder
    rm('-rf', ls('*').filter(name => (name !== 'releases') && (name !== 'blog') && (name !== 'showcase.html') && (name !== 'support.html')));
    cd('../..');
    if (exec(`RN_VERSION=${version} RN_LATEST_VERSION=${latestVersion} \
    RN_AVAILABLE_DOCS_VERSIONS=${versions} node server/generate.js`).code !== 0) {
      echo('Error: Generating HTML failed');
      exit(1);
    }
    cd('build/react-native-gh-pages');
    // blog, showcase, support are copied separately
    let toCopy = ls('../react-native')
      .filter(file => (file !== 'blog') && (file !== 'showcase.html') && (file !== 'support.html'))
      .map(file => `../react-native/${file}`);
    cp('-R', toCopy, '.');
  }
  // blog, showcase, support are versionless, we always build them in root file
  if (areVersionlessSectionsToBeDeployed) {
    echo('------------ COPYING blog');
    rm('-rf', 'blog');
    cp('-R', '../react-native/blog', '.');
    echo('------------ COPYING showcase');
    cp('../react-native/showcase.html', '.');
    echo('------------ COPYING support');
    cp('../react-native/support.html', '.');
  }
  if (currentCommit === latestTagCommit || version) {
    exec('git status');
    exec('git add -A .');
    if (exec('git diff-index --quiet HEAD --').code !== 0) {
      if (exec(`git commit -m "Updated docs for ${version}"`).code !== 0) {
        echo('Error: Git commit gh-pages failed');
        exit(1);
      }
      if (exec('git push origin gh-pages').code !== 0) {
        echo('Error: Git push gh-pages failed');
        exit(1);
      }
    }
    echo('------------ gh-pages updated');
  }

}