import Foundation
import Combine
import SwiftUI

/// View Model closable protocol - conform to this protocol if your view model should emit close block to close the screen that uses this view model
public protocol ViewModelClosableProtocol {
	var closeCancellable: AnyCancellable? { get set }
	
	// when inheriting protocol, set @Published
	// var shouldCloseView: Bool { get set }
	// @Published ~== CurrentValueSubject<Bool, Never>, but we can't use property wrappers in protocol
	var shouldCloseView: CurrentValueSubject<Bool, Never> { get set }
}
extension ViewModelClosableProtocol {
	mutating func closeAction() {
		shouldCloseView.value = true
	}
}

public protocol ViewWithPresentationMode {
	var presentationMode: Binding<PresentationMode> { get }
}

public extension View where Self: ViewWithPresentationMode {
	
	@inlinable func onAppearSetupCloseCallback<Closable: ViewModelClosableProtocol>(closableViewModel: inout Closable) {
		closableViewModel.closeCancellable = closableViewModel.shouldCloseView.sink(receiveValue: { shouldClose -> Void in
			if shouldClose {
					presentationMode.wrappedValue.dismiss()
				}
		})
	}
}

var SomeView: View, ViewWithPresentationMode {
var body: some View {
	ZStack {
	}.onAppear {
		self.onAppearSetupCloseCallback(closableViewModel: &self.bussinessLogic.correctionDoseData)
	}
}
}