class Fe::Admin::QuestionPagesController < ApplicationController
  before_action :check_valid_user

  before_action :get_sheet

  # selecting a page
  # GET /pages/1
  def show
    @page = @question_sheet.pages.find(params[:id])
    @elements = @page.elements

    respond_to do |format|
      format.js
    end
  end

  # GET /pages/1/edit
  def edit
    @page = @question_sheet.pages.find(params[:id])

    respond_to do |format|
      format.js
    end
  end

  # POST /pages
  def create
    @page = @question_sheet.pages.build(label: next_label, number: @question_sheet.pages.length + 1)
    @all_pages = @question_sheet.pages

    respond_to do |format|
      if @page.save
        format.js
      else
        format.js { render action: "error.rjs"}
      end
    end
  end

  # PUT /pages/1
  def update
    @page = @question_sheet.pages.find(params[:id])

    respond_to do |format|
      if @page.update(page_params)
        @all_pages = @question_sheet.pages
        format.js { render action: :destroy }
      else
        format.js { render action: "error.rjs"}
      end
    end
  end

  # DELETE /pages/1
  def destroy
    unless @question_sheet.pages.length <= 1
      @page = @question_sheet.pages.find(params[:id])
      @page.destroy

      @all_pages = @question_sheet.pages
      @page = @all_pages[0]

      respond_to do |format|
        format.js
      end
    end
  end

  # load panel all AJAX-like
  # GET
  def show_panel
    @tab_name = params[:panel_name]
    @panel_name = params[:panel_name] == "properties" ? "prop_sheet" : params[:panel_name]
    @all_pages = @question_sheet.pages  # for pages_list
    @page = @question_sheet.pages.find(params[:id])

    respond_to do |format|
      format.js # load panel
    end
  end

  def reorder
    @question_sheet.pages.each do |page|
      if params['list-pages'].index(page.id.to_s)
        page.number = params['list-pages'].index(page.id.to_s) + 1
        page.save!
        @page = page
      end
    end
    render nothing: true
  end

  private
  def get_sheet
    @question_sheet = Fe::QuestionSheet.find(params[:question_sheet_id])
  end

  # next unused label with "Untitled form" prefix
  def next_label
    Fe.next_label("Page", untitled_labels)
  end

  # returns a list of existing Untitled forms
  # (having a separate method makes it easy to mock in the spec)
  def untitled_labels
    Fe::Page.where("label like 'Page%'").map {|s| s.label}
  end

  def page_params
    params.fetch(:fe_page, {}).permit({label_translations: Fe::LANGUAGES.keys}, :label, :hidden, :no_cache)
  end
end