module Members
  class AuthorizedDestroyService < BaseService
    attr_accessor :member, :user

    def initialize(member, user = nil)
      @member, @user = member, user
    end

    def execute
      return false if member.is_a?(GroupMember) && member.source.last_owner?(member.user)

      Member.transaction do
        unassign_issues_and_merge_requests(member)

        member.destroy
      end

      if member.request? && member.user != user
        notification_service.decline_access_request(member)
      end

      member
    end

    private

    def unassign_issues_and_merge_requests(member)
      if member.is_a?(GroupMember)
        IssuesFinder.new(user, group_id: member.source_id, assignee_id: member.user_id).
          execute.
          update_all(assignee_id: nil)
        MergeRequestsFinder.new(user, group_id: member.source_id, assignee_id: member.user_id).
          execute.
          update_all(assignee_id: nil)
      else
        project = member.source
        project.issues.opened.assigned_to(member.user).update_all(assignee_id: nil)
        project.merge_requests.opened.assigned_to(member.user).update_all(assignee_id: nil)
        member.user.update_cache_counts
      end
    end
  end
end