/**
 * Copyright (c) 2013-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';

const fs = require('fs');
const includes = require('lodash.includes');

import { danger, fail, markdown, warn } from 'danger';

const isDocsFile = path => includes(path, 'docs/');
const editsDocs = danger.git.modified_files.filter(isDocsFile).length > 0;
const addsDocs = danger.git.created_files.filter(isDocsFile).length > 0;
if (addsDocs || editsDocs) {
  // Note, this does not yet cover edits to the autogenerated docs
  // (e.g. comments within JS source files)
  markdown(':page_facing_up: Thanks for your contribution to the docs!');
}

const isBlogFile = path => includes(path, 'blog/');

// Flags new blog posts. Note that mentions will not be parsed as the access token we're using does
// not belong to the Facebook org (on purpose)
const addsBlogPost = danger.git.created_files.filter(isBlogFile).length > 0;
if (addsBlogPost) {
  const message = ':memo: Blog post';
  const idea = 'This PR appears to add a new blog post, ' +
    'and may require further review from the React Native team.';
  warn(`${message} - <i>${idea}</i>`);
  markdown(':memo: This PR requires attention from the @facebook/react-native team.');
}

// Flags edits to blog posts
const editsBlogPost = danger.git.modified_files.filter(isBlogFile).length > 0;
if (editsBlogPost) {
  const message = ':memo: Blog post';
  const idea = 'This PR appears to edit an existing blog post, ' +
    'and may require further review from the React Native team.';
  warn(`${message} - <i>${idea}</i>`);
  markdown('This PR requires attention from the @facebook/react-native team.');
}

// Fails if the description is too short.
if (danger.github.pr.body.length < 10) {
  fail(':grey_question: This pull request needs a description.');
}

// Warns if the PR title contains [WIP]
const isWIP = includes(danger.github.pr.title, '[WIP]');
if (isWIP) {
  const message = ':construction_worker: Work In Progress';
  const idea = 'This PR appears to be a work in progress, and may not be ready to be merged yet.';
  warn(`${message} - <i>${idea}</i>`);
}

// Warns if there are changes to package.json, and tags the team.
const packageChanged = includes(danger.git.modified_files, 'package.json');
if (packageChanged) {
  const message = ':lock: package.json';
  const idea = 'Changes were made to package.json. ' +
    'This will require a manual import by a Facebook employee.';
  warn(`${message} - <i>${idea}</i>`);
  markdown('This PR requires attention from the @facebook/react-native team.');
}

// Warns if a test plan is missing.
const gettingStartedChanged = includes(danger.git.modified_files, 'docs/GettingStarted.md');
const includesTestPlan = danger.github.pr.body.toLowerCase().includes('test plan');

// Warns if a test plan is missing, when editing the Getting Started guide. This page needs to be
// tested in all its permutations.
if (!includesTestPlan && gettingStartedChanged) {
  const message = ':clipboard: Test Plan';
  const idea = 'This PR appears to be missing a Test Plan.';
  warn(`${message} - <i>${idea}</i>`);
}
// Doc edits rarely require a test plan. We'll trust the reviewer to push back if one is needed.
if (!includesTestPlan && !editsDocs) {
  const message = ':clipboard: Test Plan';
  const idea = 'This PR appears to be missing a Test Plan.';
  warn(`${message} - <i>${idea}</i>`);
}

// Tags PRs that have been submitted by a core contributor.
const taskforce = fs.readFileSync('../bots/IssueCommands.txt', 'utf8').split('\n')[0].split(':')[1];
const isSubmittedByTaskforce = includes(taskforce, danger.github.pr.user.login);
if (isSubmittedByTaskforce) {
  markdown('This PR has been submitted by a core contributor.');
}

// Warns if the bots whitelist file is updated.
const issueCommandsFileModified = includes(danger.git.modified_files, 'bots/IssueCommands.txt');
if (issueCommandsFileModified) {
  const message = ':exclamation: Bots';
  const idea = 'This PR appears to modify the list of people that may issue commands to the ' +
    'GitHub bot.';
  warn(`${message} - <i>${idea}</i>`);
}