ozfortress/citadel

module Leagues
  module Rosters
    module Transfers
      module CreationService
        include BaseService

        def call(roster, user, params)
          request = roster.transfer_requests.new(params.merge(created_by: user))

          request.transaction do
            # Allow creating transfer requests for joining, if a player is already leaving
            destroy_leaving_request(request)

            save_or_approve(request, roster)
          end

          request
        end

        private

        def destroy_leaving_request(request)
          request.league.transfer_requests
                 .pending
                 .where(user: request.user, is_joining: false)
                 .destroy_all
        end

        def save_or_approve(request, roster)
          user = request.user

          if roster.league.transfers_require_approval?
            request.save || rollback!

            request_notify_user(request, user, roster)
          else
            request.approve(user) || rollback!

            transfer_notify_user(request, user, roster)
          end
        end

        def request_msg(request)
          if request.is_joining?
            'into'
          else
            'out of'
          end
        end

        def request_notify_user(request, user, roster)
          msg = "It has been requested for you to transfer #{request_msg(request)} "\
                "#{roster.name} for #{roster.league.name}"
          link = team_path(roster.team)

          Users::NotificationService.call(user, message: msg, link: link)
        end

        def transfer_notify_user(request, user, roster)
          msg = "You have been transferred #{request_msg(request)} "\
                "#{roster.name} for #{roster.league.name}"
          link = team_path(roster.team)

          Users::NotificationService.call(user, message: msg, link: link)
        end
      end
    end
  end
end