import Adwaita
import Foundation

@propertyWrapper
public struct Injected<T> {

    private let keyPath: KeyPath<InjectionValues, T?>
    private let observerRef: ObserverRef

    public var wrappedValue: T {
        DIContainer.shared.resolve(keyPath)
    }

    public init(_ keyPath: KeyPath<InjectionValues, T?>) {
        self.keyPath = keyPath
        self.observerRef = ObserverRef(
            id: DIContainer.shared.addObserver(for: keyPath) {
                StateManager.updateViews()
            }
        )
    }
}

private final class ObserverRef {
    let id: UUID
    init(id: UUID) { self.id = id }
    deinit { DIContainer.shared.removeObserver(id) }
}