#!/usr/bin/env node
/* eslint global-require: 0 */
/* eslint quote-props: 0 */
const path = require('path');
const https = require('https');
const fs = require('fs');
const rimraf = require('rimraf');
const {safeExec} = require('./utils/child-process-wrapper.js');

const npmElectronTarget = require('../package.json').devDependencies.electron;
const npmEnvs = {
  system: process.env,
  electron: Object.assign({}, process.env, {
    'npm_config_target': npmElectronTarget,
    'npm_config_arch': process.arch,
    'npm_config_target_arch': process.arch,
    'npm_config_disturl': 'https://atom.io/download/atom-shell',
    'npm_config_runtime': 'electron',
    'npm_config_build_from_source': true,
  }),
};

function npm(cmd, options) {
  const {cwd, env} = Object.assign({cwd: '.', env: 'system'}, options);

  return new Promise((resolve, reject) => {
    console.log(`\n-- Running npm ${cmd} in ${cwd} with ${env} config --`)

    safeExec(`npm ${cmd}`, {
      cwd: path.resolve(__dirname, '..', cwd),
      env: npmEnvs[env],
    }, (err) => {
      return err ? reject(err) : resolve(null);
    });
  });
}

function downloadMailsync() {
  safeExec('git rev-parse HEAD', (err, output) => {
    const head = output.substr(0, 8);
    const filename = process.platform === 'win32' ? 'mailsync.exe' : 'mailsync';
    const distKey = `${process.platform}-${process.arch}`;
    const distDir = {
      "darwin-x64": 'osx',
      "darwin-ia32": null,
      "win32-x64": 'win-ia32', // serve 32-bit since backwards compatibility is great
      "win32-ia32": 'win-ia32',
      "linux-x64": 'linux',
      "linux-ia32": null,
    }[distKey];
    if (!distDir) {
      console.error(`\nSorry, a Mailspring Mailsync build for your machine (${distKey}) is not yet available.`)
      return;
    }

    const distS3URL = `https://mailspring-builds.s3.amazonaws.com/client/${head}/${distDir}/${filename}`;
    https.get(distS3URL, (response) => {
      if (response.statusCode === 200) {
        response.pipe(fs.createWriteStream(`app/${filename}`));
        response.on('end', () => {
          console.log(`\nDownloaded Mailspring Mailsync build ${distDir}-${head} to ./app\n`);
        })
      } else {
        console.error(`Sorry, an error occurred while fetching the Mailspring Mailsync build for your machine\n(${distS3URL})\n`);
        response.pipe(process.stderr);
        response.on('end', () => console.error('\n'));
      }
    });
  })
}

// For speed, we cache app/node_modules. However, we need to
// be sure to do a full rebuild of native node modules when the
// Electron version changes. To do this we check a marker file.
const appModulesPath = path.resolve(__dirname, '..', 'app', 'node_modules');
const cacheVersionPath = path.join(appModulesPath, '.postinstall-target-version');
const cacheElectronTarget = fs.existsSync(cacheVersionPath) && fs.readFileSync(cacheVersionPath).toString();

if (cacheElectronTarget !== npmElectronTarget) {
  console.log(`\n-- Clearing app/node_modules --`)
  rimraf.sync(appModulesPath);
}

// run `npm install` in ./app with Electron NPM config
npm('install', {cwd: './app', env: 'electron'}).then(() => {
  // run `npm dedupe` in ./app with Electron NPM config
  npm('dedupe', {cwd: './app', env: 'electron'}).then(() => {
    // write the marker with the electron version
    fs.writeFileSync(cacheVersionPath, npmElectronTarget);

    // if the user hasn't cloned the private mailsync module, download
    // the binary for their operating system that was shipped to S3.
    if (!fs.existsSync('./mailsync/build.sh')) {
      console.log(`\n-- Downloading a compiled version of Mailspring mailsync --`)
      downloadMailsync();
    }
  });
});