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Coverage for "ContainerActionBox.swift" : 68.06%

(49 of 72 relevant lines covered)

RouteComposer/Classes/Router/Type Erasure/Boxes/ContainerActionBox.swift

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//
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// RouteComposer
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// ContainerActionBox.swift
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// https://github.com/ekazaev/route-composer
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//
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// Created by Eugene Kazaev in 2018-2022.
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// Distributed under the MIT license.
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//
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// Become a sponsor:
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// https://github.com/sponsors/ekazaev
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//
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import Foundation
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import UIKit
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struct ContainerActionBox<A: ContainerAction>: AnyAction, AnyActionBox, CustomStringConvertible, MainThreadChecking {
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    let action: A
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    init(_ action: A) {
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        self.action = action
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    }
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    func perform(with viewController: UIViewController,
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                 on existingController: UIViewController,
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                 with postponedIntegrationHandler: PostponedActionIntegrationHandler,
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                 nextAction: AnyAction?,
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                 animated: Bool,
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                 completion: @escaping (RoutingResult) -> Void) {
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        assertIfNotMainThread()
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        if let postponedController = postponedIntegrationHandler.containerViewController {
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            guard postponedController is A.ViewController else {
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                postponedIntegrationHandler.purge(animated: animated, completion: { result in
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                    guard result.isSuccessful else {
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                        completion(result)
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                        return
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                    }
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                    self.perform(with: viewController,
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                                 on: existingController,
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                                 with: postponedIntegrationHandler,
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                                 nextAction: nextAction,
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                                 animated: animated,
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                                 completion: completion)
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                })
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                return
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            }
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            embed(viewController: viewController, with: postponedIntegrationHandler, completion: completion)
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        } else {
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            guard let containerController: A.ViewController = UIViewController.findContainer(of: existingController) else {
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                completion(.failure(RoutingError.typeMismatch(type: type(of: existingController),
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                                                              expectedType: ActionType.ViewController.self,
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                                                              .init("Container of \(String(describing: ActionType.ViewController.self)) type cannot be found in the parents of " +
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                                                                  "\(String(describing: existingController)) to perform \(action)"))))
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                return
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            }
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            let shouldDelayPerforming = nextAction?.isEmbeddable(to: A.ViewController.self) ?? false
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            if shouldDelayPerforming {
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                postponedIntegrationHandler.update(containerViewController: containerController, animated: animated, completion: { result in
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                    guard result.isSuccessful else {
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                        completion(result)
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                        return
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                    }
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                    self.embed(viewController: viewController, with: postponedIntegrationHandler, completion: completion)
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                })
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            } else {
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                postponedIntegrationHandler.purge(animated: animated, completion: { result in
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                    guard result.isSuccessful else {
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                        completion(result)
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                        return
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                    }
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                    self.action.perform(with: viewController, on: containerController, animated: animated) { result in
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                        self.assertIfNotMainThread()
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                        completion(result)
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                    }
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                })
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            }
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        }
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    }
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    private func embed(viewController: UIViewController, with postponedIntegrationHandler: PostponedActionIntegrationHandler, completion: @escaping (RoutingResult) -> Void) {
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        do {
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            var postponedChildControllers = postponedIntegrationHandler.postponedViewControllers
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            try perform(embedding: viewController, in: &postponedChildControllers)
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            postponedIntegrationHandler.update(postponedViewControllers: postponedChildControllers)
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            completion(.success)
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        } catch {
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            completion(.failure(error))
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        }
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    }
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    func perform(embedding viewController: UIViewController, in childViewControllers: inout [UIViewController]) throws {
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        try action.perform(embedding: viewController, in: &childViewControllers)
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    }
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    public var description: String {
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        String(describing: action)
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    }
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    func isEmbeddable(to container: ContainerViewController.Type) -> Bool {
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        container is A.ViewController.Type
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    }
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}