class OverlaysController < ApplicationController
  before_action :set_overlay, only: [ :destroy ]
  before_action :set_server_template, only: [ :create, :destroy ]

  def index
    @system_overlays = Overlay.system_overlays
    @custom_overlays = current_user.overlays.custom_overlays.order(:name)
  end

  def new
    @overlay = current_user.overlays.build
  end

  def create
    if @server_template.present?
      # Attach existing overlay to a template
      @overlay = Overlay.find(params[:overlay_id])

      position = @server_template.template_overlays.maximum(:position).to_i + 1
      @template_overlay = @server_template.template_overlays.build(overlay_id: @overlay.id, position: position)

      if @template_overlay.save
        Activity.log(current_user, "added_overlay", "ServerTemplate", @server_template.id, { overlay: @overlay.name })
        redirect_to @server_template, notice: "Overlay added successfully!"
      else
        redirect_to @server_template, alert: "Failed to add overlay"
      end
    else
      # Create a new custom overlay for the current user
      @overlay = current_user.overlays.build(overlay_params.merge(overlay_type: "custom"))

      if @overlay.save
        Activity.log(current_user, "created_overlay", "Overlay", @overlay.id, { name: @overlay.name, slug: @overlay.slug })
        redirect_to overlays_path, notice: "Overlay created"
      else
        render :new, status: :unprocessable_entity
      end
    end
  end

  def destroy
    if @server_template.present?
      authorize_user_for_template_overlay!
      @overlay.template_overlays.where(server_template_id: @server_template.id).destroy_all
      Activity.log(current_user, "removed_overlay", "ServerTemplate", @server_template.id, { overlay: @overlay.name })
      redirect_to @server_template, notice: "Overlay removed successfully!"
    else
      authorize_owner!
      name = @overlay.name
      @overlay.destroy
      redirect_to overlays_path, notice: "Overlay '#{name}' deleted"
    end
  end

  private

  def set_overlay
    @overlay = Overlay.find(params[:id]) if params[:id].present?
  end

  def set_server_template
    return unless params[:server_template_id].present?
    @server_template = current_user.server_templates.find(params[:server_template_id])
  end

  def overlay_params
    params.require(:overlay).permit(:name, :slug)
  end

  def authorize_user_for_template_overlay!
    redirect_to dashboard_path, alert: "Not authorized" unless @overlay.user_id.nil? || @overlay.user_id == current_user.id
  end

  def authorize_owner!
    redirect_to overlays_path, alert: "Not authorized" unless @overlay.user_id == current_user.id
  end
end