import * as transition from "tns-core-modules/ui/transition";

export class CustomTransition extends transition.Transition {
    constructor(duration: number, curve: any) {
        super(duration, curve);
    }

    public createAndroidAnimation(transitionType: string): android.view.animation.Animation {
        const scaleValues = [];

        switch (transitionType) {
            case transition.AndroidTransitionType.enter:
            case transition.AndroidTransitionType.popEnter:
                scaleValues[0] = 0;
                scaleValues[1] = 1;
                break;
            case transition.AndroidTransitionType.exit:
            case transition.AndroidTransitionType.popExit:
                scaleValues[0] = 1;
                scaleValues[1] = 0;
                break;
        }
            
        const animationSet = new android.view.animation.AnimationSet(false);
        const duration = this.getDuration();
        if (duration !== undefined) {
            animationSet.setDuration(duration);
        }

        animationSet.setInterpolator(this.getCurve());
        animationSet.addAnimation(
            new android.view.animation.ScaleAnimation(
                scaleValues[0], 
                scaleValues[1], 
                scaleValues[0], 
                scaleValues[1]
            ));

        return animationSet;
    }
}