techvision/brails4

class Admin::TopicsController < AdminController

  def index
    @level = Level.find(params[:level_id])
    @topics = @level.topics.all.order_by("seq_number ASC")
  end

  def show
    @topic = Topic.find(params[:id])
    @contents = @topic.contents
    @questions = @topic.questions
  end

  def new
    @level = Level.find(params[:level_id])
    @topic = @level.topics.build
    @topic.contents.build
  end

  def create
    @level = Level.find(params[:level_id])
    @topic = @level.topics.build(topic_params)
    if @topic.save
      redirect_to admin_level_path(@topic.level), notice: "Topic successfully created."
    else
      render :new, alert: "Topic could not be created."
    end
  end

  def edit
    @topic = Topic.find(params[:id])
  end

  def update
    @topic = Topic.find(params[:id])
    if @topic.update_attributes(topic_params)
      redirect_to admin_level_path(@topic.level_id), notice: "Topic successfully updated."
    else
      render action: :edit, alert: "Topic could not be updated."
    end
  end
  
  def destroy
    @topic = Topic.find(params[:id])
    if @topic.destroy
      redirect_to admin_level_path(@topic.level_id), notice: "Topic successfully deleted."
    else
      redirect_to admin_level_path(@topic.level_id), alert: "Topic could not be deleted."
    end
  end

  private

  def topic_params
    params.require(:topic).permit(:title, :seq_number, contents_attributes: [:title,:transcript,:summary, :youtube_channel_url])
  end
end