//
//  MVMCoreUITopAlertView+Extension.swift
//  MVMCoreUI
//
//  Created by Scott Pfeil on 9/11/20.
//  Copyright © 2020 Verizon Wireless. All rights reserved.
//

import Foundation
import MVMCore

/// A simple container view that shows and hides a notification.
public class NotificationContainerView: UIView {
    
    public var currentNotificationView: UIView?
    
    lazy private var height = heightAnchor.constraint(equalToConstant: 0)
    
    public init() {
        super.init(frame: .zero)
        setupView()
    }
    
    required init?(coder: NSCoder) {
        super.init(coder: coder)
        setupView()
    }
    
    /// Posts a layout change with taking the arguments from the view following the AccessibilityProtocol.
    private func updateAccessibilityForTopAlert(_ view: UIView) {
        // Update accessibility with top alert
        var accessibilityArgument: Any? = view
        if let view = view as? AccessibilityProtocol {
            accessibilityArgument = view.getAccessibilityLayoutChangedArgument()
        }
        UIAccessibility.post(notification: .layoutChanged, argument: accessibilityArgument)
    }
}

extension NotificationContainerView: NotificationTransitionDelegateProtocol {
    @MainActor
    public func show(notification: UIView) async {
        currentNotificationView?.removeFromSuperview()
        addSubview(notification)
        NSLayoutConstraint.constraintPinSubview(toSuperview: notification)
        currentNotificationView = notification
        
        if let conformer = notification as? MVMCoreViewProtocol {
            conformer.updateView(bounds.width)
        }
        
        superview?.layoutIfNeeded()
        await withCheckedContinuation { continuation in
            UIView.animate(withDuration: 0.5) {
                self.height.isActive = false
                self.superview?.layoutIfNeeded()
            } completion: { finished in
                self.superview?.layoutIfNeeded()
                self.updateAccessibilityForTopAlert(notification)
                continuation.resume()
            }
        }
    }
    
    @MainActor
    public func hide(notification: UIView) async {
        // accessibility - below line added to notify VI user through voiceover user when the top alert is closed
        UIAccessibility.post(notification: .screenChanged, argument: MVMCoreUIUtility.hardcodedString(withKey: "AccTopAlertClosed"))
        await withCheckedContinuation { continuation in
            UIView.animate(withDuration: 0.5) {
                self.height.isActive = true
                self.superview?.layoutIfNeeded()
            } completion: { finished in
                UIAccessibility.post(notification: .layoutChanged, argument: nil)
                self.currentNotificationView?.removeFromSuperview()
                self.currentNotificationView = nil
                continuation.resume()
            }
        }
    }
    
    @MainActor
    public func update(with model: NotificationModel, delegateObject: MVMCoreUIDelegateObject?) {
        guard let molecule = currentNotificationView as? MoleculeViewProtocol else { return }
        // Update molecule
        molecule.reset()
        molecule.set(with: model.molecule, delegateObject, nil)
        (molecule as? MVMCoreViewProtocol)?.updateView(self.bounds.width)
    }
}

extension NotificationContainerView: MVMCoreViewProtocol {
    public func updateView(_ size: CGFloat) {
        (currentNotificationView as? MVMCoreViewProtocol)?.updateView(size)
    }
    
    public func setupView() {
        translatesAutoresizingMaskIntoConstraints = false
        clipsToBounds = true
        height.isActive = true
    }
}