ios/tutorials/tutorial4-completed/TicTacToe/Promo/LaunchGameWorkflow.swift

//
//  Copyright (c) 2017. Uber Technologies
//
//  Licensed under the Apache License, Version 2.0 (the "License");
//  you may not use this file except in compliance with the License.
//  You may obtain a copy of the License at
//
//  http://www.apache.org/licenses/LICENSE-2.0
//
//  Unless required by applicable law or agreed to in writing, software
//  distributed under the License is distributed on an "AS IS" BASIS,
//  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//  See the License for the specific language governing permissions and
//  limitations under the License.
//

import RIBs
import RxSwift

public class LaunchGameWorkflow: Workflow<RootActionableItem> {
    public init(url: URL) {
        super.init()

        let gameId = parseGameId(from: url)

        self
            .onStep { (rootItem: RootActionableItem) -> Observable<(LoggedInActionableItem, ())> in
                rootItem.waitForLogin()
            }
            .onStep { (loggedInItem: LoggedInActionableItem, _) -> Observable<(LoggedInActionableItem, ())> in
                loggedInItem.launchGame(with: gameId)
            }
            .commit()
    }

    private func parseGameId(from url: URL) -> String? {
        let components = URLComponents(string: url.absoluteString)
        let items = components?.queryItems ?? []
        for item in items {
            if item.name == "gameId" {
                return item.value
            }
        }

        return nil
    }
}