install_steps_controller.rb

class InstallStepsController < ApplicationController
  include Wicked::Wizard

  prepend_before_action :set_steps
  after_action :set_session

  rescue_from Wicked::Wizard::InvalidStepError, with: ->{ redirect_to root_path }

  def show
    case step
    when :update_ruby
      skip_step if ruby_version =~ /2/
    when :update_rails
      skip_step if rails_version =~ /5/
    end
    render_wizard
  end

  def update
    current_user.update(user_params)
    render_wizard current_user
  end

  private

    def set_steps
      self.steps = [:choose_os]
      case
      when mac?
        self.steps += mac_steps
      when windows?
        self.steps += windows_steps
      when linux?
        self.steps += ubuntu_steps
      end
    end

    def mac_steps
      steps = [:choose_os_version]
      case os_version
      when "10.8", "10.7", "10.6"
        steps += [ :railsinstaller,
          :find_the_command_line,
          :verify_ruby_version,
          :update_ruby,
          :verify_rails_version,
          :update_rails,
          :configure_git,
          :sublime_text,
          :create_your_first_app,
          :see_it_live]
      when "10.12", "10.11", "10.10", "10.9"
        steps += [ :install_xcode,
          :find_the_command_line,
          :install_homebrew,
          :install_git,
          :configure_git,
          :install_rvm_and_ruby,
          :install_rails,
          :sublime_text,
          :create_your_first_app,
          :see_it_live]
      end
      return steps
    end

    def windows_steps
      [ :railsinstaller_windows, 
        :find_git_bash, 
        :update_rubygems, 
        :update_rails, 
        :sublime_text, 
        :create_your_first_app, 
        :see_it_live
      ]
    end

    def ubuntu_steps
      [:rails_for_linux_and_other]
    end

    def finish_wizard_path
      congratulations_path
    end

    def user_params
      params.permit(:os, :os_version, :ruby_version, :rails_version)
    end

    def set_session
      session[:user] = current_user.config
    end
end