import UIKit

struct Person { // Model

    let firstName: String

    let lastName: String

}

protocol GreetingView: class {

    func setGreeting(greeting: String)

}

protocol GreetingViewPresenter {

    init(view: GreetingView, person: Person)

    func showGreeting()

}

class GreetingPresenter : GreetingViewPresenter {

    unowned let view: GreetingView

    let person: Person

    required init(view: GreetingView, person: Person) {

        self.view = view

        self.person = person

    }

    func showGreeting() {

        let greeting = "Hello" + " " + self.person.firstName + " " + self.person.lastName

        self.view.setGreeting(greeting)

    }

}

class GreetingViewController : UIViewController, GreetingView {

    var presenter: GreetingViewPresenter!

    let showGreetingButton = UIButton()

    let greetingLabel = UILabel()

    override func viewDidLoad() {

        super.viewDidLoad()

        self.showGreetingButton.addTarget(self, action: "didTapButton:", forControlEvents: .TouchUpInside)

    }

    func didTapButton(button: UIButton) {

        self.presenter.showGreeting()

    }

    func setGreeting(greeting: String) {

        self.greetingLabel.text = greeting

    }

    // layout code goes here

}

// Assembling of MVP

let model = Person(firstName: "David", lastName: "Blaine")

let view = GreetingViewController()

let presenter = GreetingPresenter(view: view, person: model)

view.presenter = presenter