//  MIT License
//  Copyright © Nicolai Harbo
//
//  Permission is hereby granted, free of charge, to any person obtaining a copy of this software
//  and associated documentation files (the "Software"), to deal in the Software without restriction,
//  including without limitation the rights to use, copy, modify, merge, publish, distribute,
//  sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
//  furnished to do so, subject to the following conditions:
//
//  The above copyright notice and this permission notice shall be included in all copies or
//  substantial portions of the Software.
//
//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
//  BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
//  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
//  DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
import Combine
import UIKit

@MainActor
public final class KeyboardResponder: ObservableObject {

    @Published public var keyboardHeight: CGFloat = 0
    var showCancellable: AnyCancellable?
    var hideCancellable: AnyCancellable?

    public init() {
        showCancellable = NotificationCenter.default.publisher(for: UIResponder.keyboardWillShowNotification)
            .map { notification in
                (notification.userInfo?[UIResponder.keyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue.height ?? 0.0
            }
            .receive(on: DispatchQueue.main)
            .sink(receiveValue: { height in
//                print("keyboard height: \(height)")
                self.keyboardHeight = height
            })

        hideCancellable = NotificationCenter.default.publisher(for: UIResponder.keyboardWillHideNotification)
            .receive(on: DispatchQueue.main)
            .sink(receiveValue: { _ in
                self.keyboardHeight = 0
            })
    }
}