facadeviewmodelusage2.swift

import Foundation

protocol ProfileViewModelWorkable {
    func fetchProfileAndTagIt(completion: @escaping (Bool) -> Void)
}

class ProfileViewModelWorker: ProfileViewModelWorkable {
    func fetchProfileAndTagIt(completion: @escaping (Bool) -> Void) {
        fetchProfile { [weak self] result in
            guard let self = self else {return}
            self.tagAnalytics(result: result, completion: completion)
        }
    }
}

private protocol ProfileNetworkFetchable {
    func fetchProfile(completion: @escaping (Result<Profile,NSError>) -> Void)
}

private protocol ProfileAnalyticTaggable {
    func tagAnalytics(result: Result<Profile,NSError>, completion: @escaping (Bool) -> Void)
}

extension ProfileViewModelWorker: ProfileNetworkFetchable, ProfileAnalyticTaggable {
    func tagAnalytics(result: Result<Profile, NSError>, completion: @escaping (Bool) -> Void) {
        switch result {
        case .success(_):
            print("trigger analytics with success.......")
            completion(true)
        case .failure(_):
            print("trigger analytics with error.........")
            completion(true)
        }
    }
    
    func fetchProfile(completion: @escaping (Result<Profile,NSError>) -> Void) {
        let url = URL.init(string: "https://www.awesomewebservice.com/profile")!
        let urlRequest = URLRequest(url: url)
        let dataTask = URLSession.shared.dataTask(with: urlRequest) { data, _, _ in
            
            guard let data = data else {
                completion(.failure(NSError()))
                return
            }
            
            guard let profileDecoded = try? JSONDecoder().decode(Profile.self, from: data) else {
                completion(.failure(NSError()))
                return
            }
            
            completion(.success(profileDecoded))
        }
        
        dataTask.resume()
    }
}

class ProfileViewModel {
    var viewModelWorkable: ProfileViewModelWorkable
    
    init(viewModelWorkable: ProfileViewModelWorkable) {
        self.viewModelWorkable = viewModelWorkable
    }
}

extension ProfileViewModel {
    func fetchAndTag() {
        viewModelWorkable.fetchProfileAndTagIt { success in
            if success {
                print("profile is fetched and tagged")
            }
        }
    }
}