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//
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// RouteComposer
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// DestinationStep.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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/// Represents a single step for the `Router` to make.
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public struct DestinationStep<VC: UIViewController, C>: RoutingStep, ChainableStep {
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// MARK: Associated types
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/// Type of the `ViewController` associated with the step
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public typealias ViewController = VC
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/// Type of the `Context` associated with the step
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public typealias Context = C
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// MARK: Properties
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let destinationStep: RoutingStep
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// MARK: Methods
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init(_ destinationStep: RoutingStep) {
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self.destinationStep = destinationStep
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}
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func getPreviousStep(with context: AnyContext) -> RoutingStep? {
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destinationStep
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}
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/// Adapts context and view controller type dependencies.
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///
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/// *NB:* Developer guaranties that this types will compliment in runtime.
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public func unsafelyRewrapped<VC: UIViewController, C>() -> DestinationStep<VC, C> {
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DestinationStep<VC, C>(destinationStep)
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}
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/// Transforms context using `ContextTransformer` provided.
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public func adaptingContext<T: ContextTransformer>(using contextTransformer: T) -> DestinationStep<VC, T.SourceContext> where T.TargetContext == C {
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DestinationStep<VC, T.SourceContext>(ConvertingStep(contextTransformer: contextTransformer, previousStep: destinationStep))
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}
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/// Allows to avoid container view controller check.
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///
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/// *NB:* Developer guaranties that it will be there in the runtime.
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public func expectingContainer<VC: ContainerViewController>() -> DestinationStep<VC, Context> {
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DestinationStep<VC, Context>(destinationStep)
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}
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}
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// MARK: Helper methods where the Context is Any?
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/// A step that has a context type Optional(Any) can be build with any type of context passed to the router.
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public extension DestinationStep where DestinationStep.Context == Any? {
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/// Allows to avoid container view controller check. This method is available only for the steps that are
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/// able to accept any type of context.
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///
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/// *NB:* Developer guaranties that it will be there in the runtime.
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func expectingContainer<VC: ContainerViewController, C>() -> DestinationStep<VC, C> {
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DestinationStep<VC, C>(destinationStep)
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}
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/// Allows to compliment to the type check. A step that has context equal to Optional(Any) can be build
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/// with any type of context passed to the router.
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func adaptingContext<C>() -> DestinationStep<ViewController, C> {
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DestinationStep<ViewController, C>(destinationStep)
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}
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}
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