/**
 * @license
 * Copyright Google LLC All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */

const https = require('https');
const shell = require('shelljs');

function httpGet(server, path, headers) {
 return new Promise((resolve, reject) => {
 const options = {
 hostname: server,
 port: 443,
 path: path,
 method: 'GET',
 headers: {'User-Agent': 'script', ...headers}
 };
 https
 .get(
 options,
 (res) => {
 let json = '';
 res.on('data', (chunk) => json += chunk.toString());
 res.on('end', () => resolve(json));
 })
 .on('error', (e) => reject(e));
 });
}

let warnNoToken = true;

async function githubGet(path) {
 const token = process.env['TOKEN'];
 const headers = {};
 if (token) {
 headers.Authorization = 'token ' + token;
 } else if (warnNoToken) {
 warnNoToken = false;
 console.warn('############################################################');
 console.warn('############################################################');
 console.warn('WARNING: you should set the TOKEN variable to a github token');
 console.warn('############################################################');
 console.warn('############################################################');
 }

 return JSON.parse(await httpGet('api.github.com', '/repos/angular/angular/' + path, headers));
}

async function githubPrInfo(prNumber) {
 const pr = (await githubGet('pulls/' + prNumber));
 const label = pr.head.label.split(':');
 const user = label[0];
 const branch = label[1];
 return {
 commits: pr.commits,
 repository: {
 user: user,
 gitUrl: `git@github.com:${user}/angular.git`,
 },
 branch: branch
 };
}

function gitHasLocalModifications() {
 return execNoFatal('git diff-index --quiet HEAD --').code != 0;
}

function execNoFatal(cmd, options) {
 const fatal = shell.config.fatal;
 try {
 shell.config.fatal = false;
 return shell.exec(cmd, options);
 } finally {
 shell.config.fatal = fatal;
 }
}

function getCurrentBranch() {
 return shell.exec('git branch', {silent: true})
 .stdout.toString()
 .split('\n') // Break into lines
 .map((v) => v.trim()) // trim
 .filter((b) => b[0] == '*') // select current branch
 .map((b) => b.split('')[1])[0]; // remove leading `*`
}

exports.httpGet = httpGet;
exports.githubGet = githubGet;
exports.githubPrInfo = githubPrInfo;
exports.gitHasLocalModifications = gitHasLocalModifications;
exports.execNoFatal = execNoFatal;
exports.getCurrentBranch = getCurrentBranch;