/**
 * @license
 * Copyright Google Inc. 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
 */
import 'symbol-observable';
// symbol polyfill must go first
// tslint:disable-next-line:ordered-imports import-groups
import { tags, terminal } from '@angular-devkit/core';
import { resolve } from '@angular-devkit/core/node';
import * as fs from 'fs';
import * as path from 'path';
import { SemVer } from 'semver';
import { Duplex } from 'stream';
import { isWarningEnabled } from '../utilities/config';

const packageJson = require('../package.json');

function _fromPackageJson(cwd?: string) {
  cwd = cwd || process.cwd();

  do {
    const packageJsonPath = path.join(cwd, 'node_modules/@angular/cli/package.json');
    if (fs.existsSync(packageJsonPath)) {
      const content = fs.readFileSync(packageJsonPath, 'utf-8');
      if (content) {
        const json = JSON.parse(content);
        if (json['version']) {
          return new SemVer(json['version']);
        }
      }
    }

    // Check the parent.
    cwd = path.dirname(cwd);
  } while (cwd != path.dirname(cwd));

  return null;
}


// Check if we need to profile this CLI run.
if (process.env['NG_CLI_PROFILING']) {
  const profiler = require('v8-profiler'); // tslint:disable-line:no-implicit-dependencies
  profiler.startProfiling();
  const exitHandler = (options: { cleanup?: boolean, exit?: boolean }) => {
    if (options.cleanup) {
      const cpuProfile = profiler.stopProfiling();
      fs.writeFileSync(
        path.resolve(process.cwd(), process.env.NG_CLI_PROFILING || '') + '.cpuprofile',
        JSON.stringify(cpuProfile),
      );
    }

    if (options.exit) {
      process.exit();
    }
  };

  process.on('exit', () => exitHandler({ cleanup: true }));
  process.on('SIGINT', () => exitHandler({ exit: true }));
  process.on('uncaughtException', () => exitHandler({ exit: true }));
}

let cli;
try {
  const projectLocalCli = resolve(
    '@angular/cli',
    {
      checkGlobal: false,
      basedir: process.cwd(),
      preserveSymlinks: true,
    },
  );

  // This was run from a global, check local version.
  const globalVersion = new SemVer(packageJson['version']);
  let localVersion;
  let shouldWarn = false;

  try {
    localVersion = _fromPackageJson();
    shouldWarn = localVersion != null && globalVersion.compare(localVersion) > 0;
  } catch (e) {
    // eslint-disable-next-line no-console
    console.error(e);
    shouldWarn = true;
  }

  if (shouldWarn && isWarningEnabled('versionMismatch')) {
    const warning = terminal.yellow(tags.stripIndents`
    Your global Angular CLI version (${globalVersion}) is greater than your local
    version (${localVersion}). The local Angular CLI version is used.

    To disable this warning use "ng config -g cli.warnings.versionMismatch false".
    `);
    // Don't show warning colorised on `ng completion`
    if (process.argv[2] !== 'completion') {
        // eslint-disable-next-line no-console
      console.error(warning);
    } else {
        // eslint-disable-next-line no-console
      console.error(warning);
      process.exit(1);
    }
  }

  // No error implies a projectLocalCli, which will load whatever
  // version of ng-cli you have installed in a local package.json
  cli = require(projectLocalCli);
} catch {
  // If there is an error, resolve could not find the ng-cli
  // library from a package.json. Instead, include it from a relative
  // path to this script file (which is likely a globally installed
  // npm package). Most common cause for hitting this is `ng new`
  cli = require('./cli');
}

if ('default' in cli) {
  cli = cli['default'];
}

// This is required to support 1.x local versions with a 6+ global
let standardInput;
try {
  standardInput = process.stdin;
} catch (e) {
  delete process.stdin;
  process.stdin = new Duplex();
  standardInput = process.stdin;
}

cli({
  cliArgs: process.argv.slice(2),
  inputStream: standardInput,
  outputStream: process.stdout,
})
  .then((exitCode: number) => {
    process.exit(exitCode);
  })
  .catch((err: Error) => {
    console.error('Unknown error: ' + err.toString());
    process.exit(127);
  });
