#!/usr/bin/env node

if (!process.env.CI) require('dotenv-safe').load();
const args = require('minimist')(process.argv.slice(2), {
  boolean: ['automaticRelease', 'notesOnly', 'stable']
});
const ciReleaseBuild = require('./ci-release-build');
const octokit = require('@octokit/rest')({
  auth: process.env.ELECTRON_GITHUB_TOKEN
});
const { execSync } = require('child_process');
const { GitProcess } = require('dugite');

const path = require('path');
const readline = require('readline');
const releaseNotesGenerator = require('./notes/index.js');
const { getCurrentBranch, ELECTRON_DIR } = require('../lib/utils.js');
const bumpType = args._[0];
const targetRepo = bumpType === 'nightly' ? 'nightlies' : 'electron';

require('colors');
const pass = '✓'.green;
const fail = '✗'.red;

if (!bumpType && !args.notesOnly) {
  console.log('Usage: prepare-release [stable | minor | beta | nightly]' +
     ' (--stable) (--notesOnly) (--automaticRelease) (--branch)');
  process.exit(1);
}

async function getNewVersion (dryRun) {
  if (!dryRun) {
    console.log(`Bumping for new "${bumpType}" version.`);
  }
  const bumpScript = path.join(__dirname, 'version-bumper.js');
  const scriptArgs = ['node', bumpScript, `--bump=${bumpType}`];
  if (dryRun) scriptArgs.push('--dryRun');
  try {
    let bumpVersion = execSync(scriptArgs.join(' '), { encoding: 'UTF-8' });
    bumpVersion = bumpVersion.substr(bumpVersion.indexOf(':') + 1).trim();
    const newVersion = `v${bumpVersion}`;
    if (!dryRun) {
      console.log(`${pass} Successfully bumped version to ${newVersion}`);
    }
    return newVersion;
  } catch (err) {
    console.log(`${fail} Could not bump version, error was:`, err);
    throw err;
  }
}

async function getReleaseNotes (currentBranch, newVersion) {
  if (bumpType === 'nightly') {
    return { text: 'Nightlies do not get release notes, please compare tags for info.' };
  }
  console.log(`Generating release notes for ${currentBranch}.`);
  const releaseNotes = await releaseNotesGenerator(currentBranch, newVersion);
  if (releaseNotes.warning) {
    console.warn(releaseNotes.warning);
  }
  return releaseNotes;
}

async function createRelease (branchToTarget, isBeta) {
  const newVersion = await getNewVersion();
  const releaseNotes = await getReleaseNotes(branchToTarget, newVersion);
  await tagRelease(newVersion);

  console.log('Checking for existing draft release.');
  const releases = await octokit.repos.listReleases({
    owner: 'electron',
    repo: targetRepo
  }).catch(err => {
    console.log(`${fail} Could not get releases. Error was: `, err);
  });

  const drafts = releases.data.filter(release => release.draft &&
    release.tag_name === newVersion);
  if (drafts.length > 0) {
    console.log(`${fail} Aborting because draft release for
      ${drafts[0].tag_name} already exists.`);
    process.exit(1);
  }
  console.log(`${pass} A draft release does not exist; creating one.`);

  let releaseBody;
  let releaseIsPrelease = false;
  if (isBeta) {
    if (newVersion.indexOf('nightly') > 0) {
      releaseBody = 'Note: This is a nightly release.  Please file new issues ' +
        'for any bugs you find in it.\n \n This release is published to npm ' +
        'under the nightly tag and can be installed via npm install electron@nightly, ' +
        `or npm i electron-nightly@${newVersion.substr(1)}.\n \n ${releaseNotes.text}`;
    } else {
      releaseBody = 'Note: This is a beta release.  Please file new issues ' +
        'for any bugs you find in it.\n \n This release is published to npm ' +
        'under the beta tag and can be installed via npm install electron@beta, ' +
        `or npm i electron@${newVersion.substr(1)}.\n \n ${releaseNotes.text}`;
    }
    releaseIsPrelease = true;
  } else {
    releaseBody = releaseNotes.text;
  }

  const release = await octokit.repos.createRelease({
    owner: 'electron',
    repo: targetRepo,
    tag_name: newVersion,
    draft: true,
    name: `electron ${newVersion}`,
    body: releaseBody,
    prerelease: releaseIsPrelease,
    target_commitish: newVersion.indexOf('nightly') !== -1 ? 'master' : branchToTarget
  }).catch(err => {
    console.log(`${fail} Error creating new release: `, err);
    process.exit(1);
  });

  console.log(`Release has been created with id: ${release.data.id}.`);
  console.log(`${pass} Draft release for ${newVersion} successful.`);
}

async function pushRelease (branch) {
  const pushDetails = await GitProcess.exec(['push', 'origin', `HEAD:${branch}`, '--follow-tags'], ELECTRON_DIR);
  if (pushDetails.exitCode === 0) {
    console.log(`${pass} Successfully pushed the release.  Wait for ` +
      'release builds to finish before running "npm run release".');
  } else {
    console.log(`${fail} Error pushing the release: ${pushDetails.stderr}`);
    process.exit(1);
  }
}

async function runReleaseBuilds (branch) {
  await ciReleaseBuild(branch, {
    ghRelease: true,
    automaticRelease: args.automaticRelease
  });
}

async function tagRelease (version) {
  console.log(`Tagging release ${version}.`);
  const checkoutDetails = await GitProcess.exec(['tag', '-a', '-m', version, version], ELECTRON_DIR);
  if (checkoutDetails.exitCode === 0) {
    console.log(`${pass} Successfully tagged ${version}.`);
  } else {
    console.log(`${fail} Error tagging ${version}: ` +
      `${checkoutDetails.stderr}`);
    process.exit(1);
  }
}

async function verifyNewVersion () {
  const newVersion = await getNewVersion(true);
  let response;
  if (args.automaticRelease) {
    response = 'y';
  } else {
    response = await promptForVersion(newVersion);
  }
  if (response.match(/^y/i)) {
    console.log(`${pass} Starting release of ${newVersion}`);
  } else {
    console.log(`${fail} Aborting release of ${newVersion}`);
    process.exit();
  }
}

async function promptForVersion (version) {
  return new Promise((resolve, reject) => {
    const rl = readline.createInterface({
      input: process.stdin,
      output: process.stdout
    });
    rl.question(`Do you want to create the release ${version.green} (y/N)? `, (answer) => {
      rl.close();
      resolve(answer);
    });
  });
}

// function to determine if there have been commits to master since the last release
async function changesToRelease () {
  const lastCommitWasRelease = new RegExp('^Bump v[0-9.]*(-beta[0-9.]*)?(-nightly[0-9.]*)?$', 'g');
  const lastCommit = await GitProcess.exec(['log', '-n', '1', '--pretty=format:\'%s\''], ELECTRON_DIR);
  return !lastCommitWasRelease.test(lastCommit.stdout);
}

async function prepareRelease (isBeta, notesOnly) {
  if (args.dryRun) {
    const newVersion = await getNewVersion(true);
    console.log(newVersion);
  } else {
    const currentBranch = (args.branch) ? args.branch : await getCurrentBranch(ELECTRON_DIR);
    if (notesOnly) {
      const newVersion = await getNewVersion(true);
      const releaseNotes = await getReleaseNotes(currentBranch, newVersion);
      console.log(`Draft release notes are: \n${releaseNotes.text}`);
    } else {
      const changes = await changesToRelease(currentBranch);
      if (changes) {
        await verifyNewVersion();
        await createRelease(currentBranch, isBeta);
        await pushRelease(currentBranch);
        await runReleaseBuilds(currentBranch);
      } else {
        console.log('There are no new changes to this branch since the last release, aborting release.');
        process.exit(1);
      }
    }
  }
}

prepareRelease(!args.stable, args.notesOnly);