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//
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// RouteComposer
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// LastStepInChainAssembly.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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/// Helper class to build a chain of steps. Can not be used directly.
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public struct LastStepInChainAssembly<ViewController: UIViewController, Context> {
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// MARK: Properties
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let previousSteps: [RoutingStep]
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// MARK: Methods
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init(previousSteps: [RoutingStep]) {
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self.previousSteps = previousSteps
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}
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/// Assembles all the provided settings.
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///
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/// - Returns: The instance of `DestinationStep` with all the settings provided inside.
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public func assemble() -> DestinationStep<ViewController, Context> {
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DestinationStep(chain(previousSteps))
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}
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private func chain(_ steps: [RoutingStep]) -> RoutingStep {
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guard let lastStep = steps.last else {
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preconditionFailure("No steps provided to chain.")
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}
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let firstStep = steps.dropLast().reversed().reduce(lastStep) { result, currentStep in
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guard var step = currentStep as? BaseStep else {
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assertionFailure("\(currentStep) can not be chained to non chainable step \(result)")
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return currentStep
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}
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step.from(result)
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return step
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}
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return firstStep
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}
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}
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