/// 1
protocol LaunchesBusinessLogic {
    func fetchLaunches(request: LaunchesPage.FetchLaunches.Request)

    ...
}

/// 2
protocol LaunchesDataStore {
    var launches: [Launch]? { get }
}

final class LaunchesInteractor: LaunchesBusinessLogic, LaunchesDataStore {
    var presenter: LaunchesPresentationLogic?
    var worker = LaunchesWorker()
    var launches: [Launch]?
    let debugMode = false

    // MARK: Fetchs launch to display during page loading

    func fetchLaunches(request: LaunchesPage.FetchLaunches.Request) {
        /// 3
        var response: LaunchesPage.FetchLaunches.Response!
        /// 4
        worker.launchesDataManager.getLaunches(limit: nil, offset: nil).done { launches in
            self.launches = launches
            let filteredOrders = self.getFilteredByTypeLaunches(launches)
            response = LaunchesPage.FetchLaunches.Response(launches: filteredOrders, error: nil)
        }.catch { error in
            response = LaunchesPage.FetchLaunches.Response(launches: nil, error: LaunchErrors.couldNotLoadLaunches(error: error.localizedDescription))
        }.finally {
            /// 5
            self.presenter?.presentLaunches(response: response)
        }
    }
}