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protocol OfflineController {
    func cache(request: OfflineRequestConvertible, forId id: String?, encryptionKey: String?, data: Data, keepAliveUntil keepAlive: Date?, completion: @escaping OfflineControllerCompletionHandler)
    func get(request: OfflineRequestConvertible, forId id: String?, encryptionKey: String?, ifBefore before: Date?, completion: @escaping OfflineControllerCompletionHandler)
    func delete(request: OfflineRequestConvertible, forId id: String?, encryptionKey: String?, completion: @escaping OfflineControllerCompletionHandler)
}

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OfflineActionBuilder
    .toCache("https://www.medium.com")
    .data(data)
    .forId("id1")
    .keepingAliveUntil(Date())
    .build()

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OfflineActionBuilder
    .toCache("https://www.medium.com")
    .ifBefore(Date())
    .keepingAliveUntil(Date())
    .build()

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struct OfflineAction {
    
    enum `Type` {
        case cache, get, delete
    }
    
    fileprivate(set) var type: Type?
    fileprivate(set) var request: OfflineRequestConvertible?
    fileprivate(set) var data: Data?
    fileprivate(set) var id: String?

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protocol BuildStep {
    func build() -> OfflineAction
}

protocol RequestStep {
    func toCache(_ request: OfflineRequestConvertible) -> DataStep
    func toGet(_ request: OfflineRequestConvertible) -> GetCommonsStep
    func toDelete(_ request: OfflineRequestConvertible) -> CommonsStep
}

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extension OfflineActionBuilder: RequestStep, DataStep, CommonsStep, CacheCommonsStep, GetCommonsStep {
    
    func toCache(_ request: OfflineRequestConvertible) -> DataStep {
        action.type = .cache
        action.request = request
        return self as DataStep
    }
    
    func toGet(_ request: OfflineRequestConvertible) -> GetCommonsStep {
        action.type = .get

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let cache = OfflineActionBuilder.builder
    .toCache("https://www.medium.com")
    .data(Data())
    .forId("id")
    .keepingAliveUntil(Date())
    .build()

let get = OfflineActionBuilder.builder
    .toGet("https://www.medium.com")
    .withEncryptionKey("encryptionKey")

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protocol OfflineController {
    func execute(action: OfflineAction, completion: @escaping OfflineControllerCompletionHandler)
}

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class OfflineActionBuilder {
    
    fileprivate var action: OfflineAction!
    
    init() {
        fatalError("This type cannot be constructed directly, use static var 'builder' instead.")
    }
    
    private init(_ action: OfflineAction) {
        self.action = action

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//: Playground - noun: a place where people can play

import UIKit

protocol OfflineRequestConvertible {}
extension String: OfflineRequestConvertible {}

struct OfflineAction {

    enum `Type` {