const Command = require('../ember-cli/lib/models/command');
import * as path from 'path';
import * as child_process from 'child_process';
import * as chalk from 'chalk';
import { CliConfig } from '../models/config';


const VersionCommand = Command.extend({
  name: 'version',
  description: 'Outputs Angular CLI version.',
  aliases: ['v', '--version', '-v'],
  works: 'everywhere',

  availableOptions: [{
    name: 'verbose',
    type: Boolean,
    'default': false,
    description: 'Adds more details to output logging.'
  }],

  run: function (options: any) {
    let versions: any = process.versions;
    const pkg = require(path.resolve(__dirname, '..', 'package.json'));
    let projPkg: any;
    try {
      projPkg = require(path.resolve(this.project.root, 'package.json'));
    } catch (exception) {
      projPkg = undefined;
    }

    versions.os = process.platform + ' ' + process.arch;

    const alwaysPrint = ['node', 'os'];
    const roots = ['@angular/', '@ngtools/'];

    let ngCliVersion = pkg.version;
    if (!__dirname.match(/node_modules/)) {
      let gitBranch = '??';
      try {
        const gitRefName = '' + child_process.execSync('git symbolic-ref HEAD', {cwd: __dirname});
        gitBranch = path.basename(gitRefName.replace('\n', ''));
      } catch (e) {
      }

      ngCliVersion = `local (v${pkg.version}, branch: ${gitBranch})`;
    }
    const config = CliConfig.fromProject();
    if (config && config.config && config.config.project) {
      if (config.config.project.ejected) {
        ngCliVersion += ' (e)';
      }
    }

    if (projPkg) {
      roots.forEach(root => {
        versions = Object.assign(versions, this.getDependencyVersions(projPkg, root));
      });
    }
    const asciiArt = `    _                      _                 ____ _     ___
   / \\   _ __   __ _ _   _| | __ _ _ __     / ___| |   |_ _|
  / △ \\ | '_ \\ / _\` | | | | |/ _\` | '__|   | |   | |    | |
 / ___ \\| | | | (_| | |_| | | (_| | |      | |___| |___ | |
/_/   \\_\\_| |_|\\__, |\\__,_|_|\\__,_|_|       \\____|_____|___|
               |___/`;
    this.ui.writeLine(chalk.red(asciiArt));
    this.printVersion('@angular/cli', ngCliVersion);

    for (const module of Object.keys(versions)) {
      const isRoot = roots.some(root => module.startsWith(root));
      if (options.verbose || alwaysPrint.indexOf(module) > -1 || isRoot) {
        this.printVersion(module, versions[module]);
      }
    }
  },

  getDependencyVersions: function(pkg: any, prefix: string): any {
    const modules: any = {};

    Object.keys(pkg.dependencies || {})
      .concat(Object.keys(pkg.devDependencies || {}))
      .filter(depName => depName && depName.startsWith(prefix))
      .forEach(key => modules[key] = this.getVersion(key));

    return modules;
  },

  getVersion: function(moduleName: string): string {
    try {
      const modulePkg = require(path.resolve(
        this.project.root,
        'node_modules',
        moduleName,
        'package.json'));
      return modulePkg.version;
    } catch (e) {
      return 'error';
    }
  },

  printVersion: function (module: string, version: string) {
    this.ui.writeLine(module + ': ' + version);
  }
});


VersionCommand.overrideCore = true;
export default VersionCommand;