turbovault-app/app/controllers/collections_controller.rb

class CollectionsController < ApplicationController
  before_action :require_authentication
  before_action :set_collection, only: [ :show, :edit, :update, :destroy, :games ]

  def index
    @root_collections = current_user.collections.root_collections.order(:name)
  end

  def show
    @games = @collection.games.includes(:platform, :genres).page(params[:page]).per(25)
  end

  def new
    @collection = current_user.collections.build
    @collections = current_user.collections.root_collections.order(:name)
  end

  def create
    @collection = current_user.collections.build(collection_params)

    if @collection.save
      redirect_to @collection, notice: "Collection was successfully created."
    else
      @collections = current_user.collections.root_collections.order(:name)
      render :new, status: :unprocessable_entity
    end
  end

  def edit
    @collections = current_user.collections.root_collections.where.not(id: @collection.id).order(:name)
  end

  def update
    if @collection.update(collection_params)
      redirect_to @collection, notice: "Collection was successfully updated."
    else
      @collections = current_user.collections.root_collections.where.not(id: @collection.id).order(:name)
      render :edit, status: :unprocessable_entity
    end
  end

  def destroy
    @collection.destroy
    redirect_to collections_path, notice: "Collection was successfully deleted."
  end

  def games
    # Same as show, but maybe with different view
    @games = @collection.games.includes(:platform, :genres).page(params[:page]).per(25)
    render :show
  end

  private

  def set_collection
    @collection = current_user.collections.find(params[:id])
  end

  def collection_params
    permitted = params.require(:collection).permit(:name, :description, :parent_collection_id)
    # Convert empty string to nil for parent_collection_id
    permitted[:parent_collection_id] = nil if permitted[:parent_collection_id].blank?
    permitted
  end
end