import Adw

/// The source of a dialog property, either a fixed value or a live binding.
public enum DialogPropertyValue<Value> {
    /// A fixed property value applied once when the dialog mounts.
    case constant(Value)
    /// A live property binding reapplied when its value changes.
    case binding(Binding<Value>)
}

/// Supplies a dialog property as a fixed value or a live binding.
public protocol DialogPropertySource<Value> {
    /// The value type accepted by this property source.
    associatedtype Value
    /// Returns the fixed value or binding represented by this source.
    var _dialogPropertyValue: DialogPropertyValue<Value> { get }
}

/// Provides a fixed string dialog property value.
extension String: DialogPropertySource {
    /// Returns this string as a fixed dialog property value.
    public var _dialogPropertyValue: DialogPropertyValue<String> { .constant(self) }
}

/// Provides a fixed Boolean dialog property value.
extension Bool: DialogPropertySource {
    /// Returns this Boolean as a fixed dialog property value.
    public var _dialogPropertyValue: DialogPropertyValue<Bool> { .constant(self) }
}

/// Provides an integer literal as an `Int32` dialog property value.
extension Int: DialogPropertySource {
    /// Returns this integer as a fixed `Int32` value, clamped to the `Int32`
    /// range rather than trapping on an out-of-range argument.
    public var _dialogPropertyValue: DialogPropertyValue<Int32> {
        .constant(Int32(clamping: self))
    }
}

/// Provides a fixed `Int32` dialog property value.
extension Int32: DialogPropertySource {
    /// Returns this value as a fixed dialog property value.
    public var _dialogPropertyValue: DialogPropertyValue<Int32> { .constant(self) }
}

/// Provides a fixed dialog presentation mode.
extension DialogPresentationMode: DialogPropertySource {
    /// Returns this mode as a fixed dialog property value.
    public var _dialogPropertyValue: DialogPropertyValue<DialogPresentationMode> { .constant(self) }
}

/// Provides a live dialog property value through a Portico binding.
extension Binding: DialogPropertySource {
    /// Returns this binding as a live dialog property value.
    public var _dialogPropertyValue: DialogPropertyValue<Value> { .binding(self) }
}

/// Applies a static or binding dialog property source using the matching applier.
@MainActor
func appliedDialogProperty<Value>(
    _ source: (any DialogPropertySource<Value>)?,
    to view: Dialog,
    constant: (Dialog, Value) -> Dialog,
    binding: (Dialog, Binding<Value>) -> Dialog
) -> Dialog {
    guard let source else { return view }
    switch source._dialogPropertyValue {
    case .constant(let value): return constant(view, value)
    case .binding(let bound): return binding(view, bound)
    }
}