//
//  Handlerable.swift
//  VDS
//
//  Created by Matt Bruce on 7/22/22.
//

import Foundation
import Combine
import UIKit

public protocol Handlerable: AnyObject, Initable, Disabling, Surfaceable {
    var subject: PassthroughSubject<Void, Never> { get set }
    var subscribers: Set<AnyCancellable> { get set }
    var shouldUpdateView: Bool { get set }
    func updateView()
}

extension Handlerable {
    public func setupNeedsUpdateEvent() {
        handlerPublisher().sink { [weak self] _ in
            self?.updateView()
        }.store(in: &subscribers)
    }
    
    public func handlerPublisher() -> AnyPublisher<Void, Never> {
        subject
            .eraseToAnyPublisher()
            .debounce(for: .milliseconds(50), scheduler: RunLoop.main)
            .eraseToAnyPublisher()
    }
    
    public func setNeedsUpdate() {
        if shouldUpdateView {
            shouldUpdateView = false
            updateView()
            shouldUpdateView = true
        }
    }
}

extension Handlerable where Self: UIControl {
    public func addEvent(event: UIControl.Event, block: @escaping (Self)->()) {
        publisher(for: event)
            .sink(receiveValue: { c in
                block(c)
            }).store(in: &subscribers)
    }
}