require 'commander/blank'
require 'commander/command'

module Analytics
  module Command
    # A class called from CLI's 'init' argument,
    # which generates the project's configuration file depending on the user's input.
    class Init
      include Helpers::Terminal

      # Entry point of this class - the only public method in it.
      def perform
        lang = lang_selection
        analytics_path = analytics_path_selection
        src_path = src_path_selection

        config = {
          language: lang,
          analyticsFilesPath: analytics_path,
          sourcePath: src_path
        }
        Analytics::IO::Config.write(config)

        prompt.ok('Configuration file is properly created. You\'re good to go!')
      end

      ## The following methods are used to retrieve project information,
      ## in order to create analytitcs.yml configuration file.

      private

      # Prompts a user to select a programming language.
      def lang_selection
        languages = {
          'Swift' => 'swift',
          'Objective-C' => 'objc',
          'Both' => 'swift-objc'
        }
        prompt.select('Select lang:', languages)
      end

      # Prompts a user to select a path to which the generated
      # analytics files will be saved.
      def analytics_path_selection
        prompt.ask('Where would You like to store analytics files? (Press enter to use default path)', default: './Common/Analytics/')
      end

      # Prompts a user to select a path in which he'll hold a source json file,
      # from which the analytics files will be generated.
      def src_path_selection
        prompt.ask('Where would You like to store json file from which analytics files will be generated? (Press enter to use default path)', default: 'analytics-source.json')
      end
    end
  end
end