'use strict';

var chalk = require('chalk');
var fs = require('fs');
var path = require('path');
var yeoman = require('yeoman-generator');

function validatePackageName(name) {
  if (!name.match(/^([a-zA-Z_$][a-zA-Z\d_$]*\.)+([a-zA-Z_$][a-zA-Z\d_$]*)$/)) {
    return false;
  }
  return true;
}

module.exports = yeoman.generators.NamedBase.extend({
  constructor: function() {
    yeoman.generators.NamedBase.apply(this, arguments);

    this.option('package', {
      desc: 'Package name for the application (com.example.app)',
      type: String,
      defaults: 'com.' + this.name.toLowerCase()
    });
  },

  initializing: function() {
    if (!validatePackageName(this.options.package)) {
      throw new Error('Package name ' + this.options.package + ' is invalid');
    }
  },

  writing: function() {
    var templateParams = {
      package: this.options.package,
      name: this.name
    };
    this.fs.copyTpl(
      this.templatePath(path.join('src', '**')),
      this.destinationPath('android'),
      templateParams
    );
    this.fs.copy(
      this.templatePath(path.join('bin', '**')),
      this.destinationPath('android')
    );
    var javaPath = path.join.apply(
      null,
      ['android', 'app', 'src', 'main', 'java'].concat(this.options.package.split('.'))
    );
    this.fs.copyTpl(
      this.templatePath(path.join('package', '**')),
      this.destinationPath(javaPath),
      templateParams
    );
  },

  end: function() {
    var projectPath = this.destinationRoot();
    this.log(chalk.white.bold('To run your app on Android:'));
    this.log(chalk.white('   Have an Android emulator running, or a device connected'));
    this.log(chalk.white('   cd ' + projectPath));
    this.log(chalk.white('   react-native run-android'));
  }
});