forms-admin/app/controllers/pages/guidance_controller.rb at 09c7889ada46c2947e883c954db9c0c912ec944d · govuk-forms/forms-admin · GitHub

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class Pages::GuidanceController < PagesController
  def new
    guidance_input = Pages::GuidanceInput.new(page_heading: draft_question.page_heading,
                                              guidance_markdown: draft_question.guidance_markdown)
    back_link = new_question_path(current_form.id)
    render :guidance, locals: view_locals(nil, guidance_input, back_link)
  end

  def create
    guidance_input = Pages::GuidanceInput.new(guidance_input_params)
    back_link = new_question_path(current_form.id)

    case route_to
    when :preview
      guidance_input.valid?
      render :guidance, locals: view_locals(nil, guidance_input, back_link)
    when :save_and_continue
      if guidance_input.submit
        redirect_to new_question_path(current_form.id)
      else
        render :guidance, locals: view_locals(nil, guidance_input, back_link), status: :unprocessable_content
      end
    end
  end

  def edit
    guidance_input = Pages::GuidanceInput.new(page_heading: draft_question.page_heading,
                                              guidance_markdown: draft_question.guidance_markdown)
    back_link = edit_question_path(current_form.id, page.id)

    render :guidance, locals: view_locals(page, guidance_input, back_link)
  end

  def update
    guidance_input = Pages::GuidanceInput.new(guidance_input_params)
    back_link = edit_question_path(current_form.id, page.id)

    case route_to
    when :preview
      guidance_input.valid?
      render :guidance, locals: view_locals(page, guidance_input, back_link)
    when :save_and_continue
      if guidance_input.submit
        redirect_to edit_question_path(current_form.id, page.id)
      else
        render :guidance, locals: view_locals(page, guidance_input, back_link), status: :unprocessable_content
      end
    end
  end

  def render_preview
    guidance_input = Pages::GuidanceInput.new(guidance_markdown: params[:markdown])
    guidance_input.validate

    render json: { preview_html: preview_html(guidance_input), errors: guidance_input.errors[:guidance_markdown] }.to_json
  end

private

  def guidance_input_params
    params.require(:pages_guidance_input).permit(:page_heading, :guidance_markdown).merge(draft_question:)
  end

  def route_to
    params[:route_to].to_sym
  end

  def preview_html(guidance_input)
    return t("markdown_editor.no_markdown_content_html") if guidance_input.guidance_markdown.blank?

    GovukFormsMarkdown.render(guidance_input.guidance_markdown, locale: "en")
  end

  def view_locals(current_page, guidance_input, back_link)
    post_url = current_page.present? && current_page.id.present? ? guidance_edit_path : guidance_new_path
    { current_form:, page: @page, guidance_input:, preview_html: preview_html(guidance_input), post_url:, back_link: }
  end
end