module Api
  module V1
    class InboxMembersController < Api::BaseController
      before_action :fetch_inbox, only: [:create, :show]
      before_action :current_agents_ids, only: [:create]

      def create
        # update also done via same action
        if @inbox
          begin
            update_agents_list
            head :ok
          rescue StandardError
            render_could_not_create_error('Could not add agents to inbox')
          end
        else
          render_not_found_error('Agents or inbox not found')
        end
      end

      def show
        @agents = current_account.users.where(id: @inbox.members.pluck(:user_id))
      end

      private

      def update_agents_list
        # get all the user_ids which the inbox currently has as members.
        # get the list of  user_ids from params
        # the missing ones are the agents which are to be deleted from the inbox
        # the new ones are the agents which are to be added to the inbox

        agents_to_be_added_ids.each { |user_id| @inbox.add_member(user_id) }
        agents_to_be_removed_ids.each { |_user_id| @inbox.remove_member(user) }
      end

      def agents_to_be_added_ids
        params[:user_ids] - @current_agents_ids
      end

      def agents_to_be_removed_ids
        @current_agents_ids - params[:user_ids]
      end

      def current_agents_ids
        @current_agents_ids = @inbox.members.pluck(:user_id)
      end

      def fetch_inbox
        @inbox = current_account.inboxes.find(params[:inbox_id])
      end
    end
  end
end