import {join} from 'path';
import {git, ng, silentNpm} from '../utils/process';
import {expectFileToExist} from '../utils/fs';
import {updateTsConfig, updateJsonFile} from '../utils/project';
import {gitClean, gitCommit} from '../utils/git';
import {getGlobalVariable} from '../utils/env';


let packages = require('../../../lib/packages');


export default function() {
  const argv = getGlobalVariable('argv');
  let createProject = null;

  // This is a dangerous flag, but is useful for testing packages only.
  if (argv.noproject) {
    return Promise.resolve();
  } else if (argv.reuse) {
    // If we're set to reuse an existing project, just chdir to it and clean it.
    createProject = Promise.resolve()
      .then(() => process.chdir(argv.reuse))
      .then(() => gitClean());
  } else {
    // Otherwise create a project from scratch.
    createProject = Promise.resolve()
      .then(() => ng('new', 'test-project', '--skip-npm'))
      .then(() => expectFileToExist(join(process.cwd(), 'test-project')))
      .then(() => process.chdir('./test-project'));
  }

  return Promise.resolve()
    .then(() => createProject)
    .then(() => updateJsonFile('package.json', json => {
      Object.keys(packages).forEach(pkgName => {
        json['dependencies'][pkgName] = packages[pkgName].dist;
      });
    }))
    .then(() => {
      if (argv.nightly || argv['ng-sha']) {
        const label = argv['ng-sha'] ? `#2.0.0-${argv['ng-sha']}` : '';
        return updateJsonFile('package.json', json => {
          // Install over the project with nightly builds.
          Object.keys(json['dependencies'] || {})
            .filter(name => name.match(/^@angular\//))
            .forEach(name => {
              const pkgName = name.split(/\//)[1];
              json['dependencies'][`@angular/${pkgName}`]
                = `github:angular/${pkgName}-builds${label}`;
            });

          Object.keys(json['devDependencies'] || {})
            .filter(name => name.match(/^@angular\//))
            .forEach(name => {
              const pkgName = name.split(/\//)[1];
              json['devDependencies'][`@angular/${pkgName}`]
                = `github:angular/${pkgName}-builds${label}`;
            });
        });
      }
    })
    .then(() => silentNpm('install'))
    // Force sourcemaps to be from the root of the filesystem.
    .then(() => updateTsConfig(json => {
      json['compilerOptions']['sourceRoot'] = '/';
    }))
    .then(() => git('config', 'user.email', 'angular-core+e2e@google.com'))
    .then(() => git('config', 'user.name', 'Angular CLI E2e'))
    .then(() => git('config', 'commit.gpgSign', 'false'))
    .then(() => gitCommit('tsconfig-e2e-update'));
}