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import AppKit
import RxSwift
import RxCocoa

public typealias PanConfiguration = Configuration<NSPanGestureRecognizer>
public typealias PanControlEvent = ControlEvent<NSPanGestureRecognizer>
public typealias PanObservable = Observable<NSPanGestureRecognizer>

extension Factory where Gesture == GestureRecognizer {

    /**
     Returns an `AnyFactory` for `NSPanGestureRecognizer`
     - parameter configuration: A closure that allows to fully configure the gesture recognizer
     */
    public static func pan(configuration: PanConfiguration? = nil) -> AnyFactory {
        return make(configuration: configuration).abstracted()
    }
}

public extension Reactive where Base: View {

    /**
     Returns an observable `NSPanGestureRecognizer` events sequence
     - parameter configuration: A closure that allows to fully configure the gesture recognizer
     */
    func panGesture(configuration: PanConfiguration? = nil) -> PanControlEvent {
        return gesture(make(configuration: configuration))
    }
}

public extension ObservableType where E: NSPanGestureRecognizer {

    /**
     Maps the observable `GestureRecognizer` events sequence to an observable sequence of translation values of the pan gesture in the coordinate system of the specified `view` alongside the gesture velocity.

     - parameter view: A `TargetView` value on which the gesture took place.
     */
    func asTranslation(in view: TargetView = .view) -> Observable<(translation: NSPoint, velocity: NSPoint)> {
        return self.map { gesture in
            let view = view.targetView(for: gesture)
            return (
                gesture.translation(in: view),
                gesture.velocity(in: view)
            )
        }
    }
}
