module Speedo
  module Generators
    class InstallGenerator < Rails::Generators::Base
      source_root File.expand_path("../../../../", __FILE__)

      desc 'Installs Speedo files to get you going fast.'
      
      # app/views/layouts/application.html.haml
      def layout
        if File.exist? 'app/views/layouts/application.html.haml'
          if yes? 'application.html.haml already exists. Do you want the template as speedo.html.haml (for manual integration)? [yN]'
            template 'app/views/layouts/speedo/application.html.haml', 
                     'app/views/layouts/speedo.html.haml'
          end
        else
          template 'app/views/layouts/speedo/application.html.haml', 
                   'app/views/layouts/application.html.haml'
        end
        
        if File.exist? 'app/views/layouts/application.html.erb'
          if yes? 'Do you want to remove the application.html.erb layout (otherwise delete it manually)? [yN]'
            remove_file 'app/views/layouts/application.html.erb'
          end
        end
      end

      # app/assets/stylesheets/speedo.css.scss
      def copy_stylesheet
        copy_file 'app/assets/stylesheets/speedo.css.scss', 
                  'app/assets/stylesheets/speedo.css.scss'
      end

      
      # app/assets/stylesheets/application.css.scss
      def copy_application_css
        if File.exist? 'app/assets/stylesheets/application.css.scss'
          if yes? 'application.css.scss already exists. Do you want to replace it? [yN]'
            copy_file 'app/assets/stylesheets/application.css.scss', 
                      'app/assets/stylesheets/application.css.scss'
          else
            say 'Make sure to @import "speedo"; in your application.css.scss, and @import other files - do NOT use *=require.'
          end
        end
        
        if File.exist? 'app/assets/stylesheets/application.css'
          if yes? 'Do you want to remove application.css (otherwise delete it manually)? [yN]'
            remove_file 'app/assets/stylesheets/application.css'
          end
        end
      end

      # app/assets/javascripts/swim.js.coffee
      def javascript
        copy_file 'app/assets/javascripts/swim.js.coffee', 
                  'app/assets/javascripts/swim.js.coffee'
      end

      def alter_application_js
        if_file 'app/assets/javascripts/application.js' do |path|
          unless File.read(path).match /require speedo/
            inject_into_file path, before: '//= require_tree .' do
              "//= require speedo\n"
            end
          end
        end
      end
      
      # config/locales/speedo.en.yml
      def locales
        if File.exist? 'config/locales/en.yml'
          unless File.read('config/locales/en.yml').match /app_name/
            inject_into_file 'config/locales/en.yml', after: 'en:' do
              "\n  app_name: 'See config/locales to name this app'"
            end
          end
        else
          copy_file 'config/locales/speedo.en.yml', 
                    'config/locales/speedo.en.yml'
        end
      end

      def routes
        route 'mount Speedo::Engine => "/speedo"'
      end

      private

      def if_file path
        if File.exist? path
          yield path
        else
          say "#{path} not found. Add '//= require_tree .' to application.js."
        end
      end

    end
  end
end