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//
// InputInjectionBuilder.swift
// Operations
//
// Created by pronebird on 09/06/2022.
// Copyright © 2022 Mullvad VPN AB. All rights reserved.
//
import Foundation
public protocol OperationInputContext {
associatedtype Input
func reduce() -> Input?
}
public final class InputInjectionBuilder<OperationType, Context>
where OperationType: InputOperation
{
public typealias InputBlock = (inout Context) -> Void
private let operation: OperationType
private var context: Context
private var inputBlocks: [InputBlock] = []
public init(operation: OperationType, context: Context) {
self.operation = operation
self.context = context
}
public func inject<T>(
from dependency: T,
assignOutputTo keyPath: WritableKeyPath<Context, T.Output?>
) -> Self
where T: OutputOperation
{
return inject(from: dependency) { context, output in
context[keyPath: keyPath] = output
}
}
public func inject<T>(
from dependency: T,
via block: @escaping (inout Context, T.Output) -> Void
) -> Self
where T: OutputOperation
{
inputBlocks.append { context in
if let output = dependency.output {
block(&context, output)
}
}
operation.addDependency(dependency)
return self
}
public func injectCompletion<T, Success, Failure>(
from dependency: T,
via block: @escaping (inout Context, T.Completion) -> Void
) -> Self
where T: ResultOperation<Success, Failure>
{
inputBlocks.append { context in
if let completion = dependency.completion {
block(&context, completion)
}
}
operation.addDependency(dependency)
return self
}
public func reduce(_ reduceBlock: @escaping (Context) -> OperationType.Input?) {
operation.setInputBlock {
for inputBlock in self.inputBlocks {
inputBlock(&self.context)
}
return reduceBlock(self.context)
}
}
}
extension InputInjectionBuilder
where Context: OperationInputContext,
Context.Input == OperationType.Input
{
public func reduce() {
reduce { context in
return context.reduce()
}
}
}
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