skill-assessment-app/app/controllers/candidate_controller.rb

class CandidateController < ApplicationController
  before_action :authorize_candidate, except: [:welcome, :validate]

  def welcome
  end

  def saved
  end

  def thankyou
    redirect_to root_path if session[:test_id].nil?
    reset_session
  end

  def question
    @status = QuizStatus.new(current_candidate)
    qid = @status.current_question_id

    redirect_to :summary and return if qid.nil?

    prep_question qid
    @answer = Answer.new
  end

  def live_coder
    question
    render layout: false
  end

  def summary
    @quiz = current_candidate.my_quiz
    @status = QuizStatus.new(current_candidate)

    redirect_to :question and return unless @status.current_question_id.nil?
  end

  def update_text
    @answer = prep_answer
    @answer.update(answer: answer_params[:text],
                   saved: answer_params[:save],
                   submitted: answer_params[:next])
    validate_answer
  end

  def update_radio
    @answer = prep_answer
    @answer.update(answer: answer_params[:radio],
                   saved: answer_params[:save],
                   submitted: answer_params[:next])
    validate_answer
  end

  def update_checkbox
    @answer = prep_answer
    @answer.update(answer: answer_params[:checkbox],
                   saved: answer_params[:save],
                   submitted: answer_params[:next])
    validate_answer
  end

  def update_live_code
    @answer = prep_answer
    @answer.update(answer: answer_params[:live_code],
                   saved: answer_params[:save],
                   submitted: answer_params[:next])
    validate_answer
  end

  # TODO
  def update_summary
    # redirect_to :summary
  end

  def validate
    candidate = Candidate.find_by(test_hash: params['test_id'])
    redirect_to(root_path, alert: "Sorry, incorrect test id") and return if candidate.nil?

    session[:test_id] = candidate.test_hash
    redirect_to :thankyou and return if candidate.completed?
    redirect_to :question
  end

  private

    def prep_question qid
      @question = current_candidate.fetch_question(qid)
    end

    def answer_params
      params.require(:answer).permit(
        :question_id, :answer_id,
        :save, :next, :summary,
        :radio, :text, checkbox: [], live_code: []
      )
    end

    def prep_answer
      answer_ids = { question_id: answer_params[:question_id], candidate_id: current_candidate.to_i }
      answer = Answer.find_or_create_by(answer_ids)
      answer
    end

    def validate_answer
      if @answer.errors.present?
        flash[:error] = [answer_params[:question_id]]
        prep_question answer_params[:question_id]
        render :question
      else
        # TODO: change params.key? to submit = save/next/summary
        redirect_to :summary and return if params.key?(:update)
        redirect_to :saved and return if params.key?(:save)
        redirect_to :question
      end
    end
end