controller.rb

class SkillsController < ::ActionController::Base
  def root
    input = AlexaRubykit.build_request(params)
    output = AlexaRubykit::Response.new
    session_end = false # probably going to keep going
    message = "There was an error." # unknown thing happened
    session = Session.find_or_initialize_by(session_id: input.session.session_id)

    case input.type
    when "LAUNCH_REQUEST"
      # user talked to our skill but did not say something matching intent
      message = "Hi. How can we help?"
    when "INTENT_REQUEST"
      case session.state
      when "selecting_category"
        category = select_category(slot_params) # uses generic
        if category
          session.category = category
          message = "What date and time?"
          session.state = "deciding_time"
        else
          message = "Sorry, missed that. Try cleaning or handyman."
        end
      when "deciding_time"
        schedule = select_schedule(slot_params) # uses date/time
        if schedule
          session.schedule = schedule
          message = "Tell us more about it"
          session.state = "adding_details"
        else
          message = "Try things like Friday at noon."
        end
      when "adding_details" # etc
      when "confirming"
        if did_confirm?(slot_params) # uses yes
          # do it!
          message = "Your task has been booked"
          session.state = "completed"
        elsif did_exit?(slot_parms)  # uses no
          session.state = "canceled"
          session_end = true
        else
          message = "Ready to confirm? Say yes or no"
        end
      when "completed"      # etc
      end
    when "SESSION_ENDED_REQUEST"
      # it's over
      message = nil
      session_end = true
    end

    session.save!
    output.add_speech(message) unless message.blank?
    render json: output.build_response(session_end)
  end

  private

  def slot_params
    # returns all the intent slots
    # e.g. {"generic" => "what they said", "schedule_date" => "2016-12-05"}
    return @slot_params if @slot_params

    @slot_params = {}
    return @slot_params unless input.type == "INTENT_REQUEST"
    input.slots.each do |name, slot|
      key = name.underscore # category_noun, etc
      value = slot['value']
      @slot_params[key] = value
    end

    @slot_params
  end
end