import { Background } from "../styling/background";

import {
    SliderBase, valueProperty, minValueProperty, maxValueProperty,
    colorProperty, backgroundColorProperty, backgroundInternalProperty,
    Color
} from "./slider-common";

export * from "./slider-common";

class SliderChangeHandlerImpl extends NSObject {

    private _owner: WeakRef<Slider>;

    public static initWithOwner(owner: WeakRef<Slider>): SliderChangeHandlerImpl {
        let handler = <SliderChangeHandlerImpl>SliderChangeHandlerImpl.new();
        handler._owner = owner;

        return handler;
    }

    public sliderValueChanged(sender: UISlider) {
        let owner = this._owner.get();
        if (owner) {
            valueProperty.nativeValueChange(owner, sender.value);
        }
    }

    public static ObjCExposedMethods = {
        "sliderValueChanged": { returns: interop.types.void, params: [UISlider] }
    };
}

export class Slider extends SliderBase {
    nativeViewProtected: UISlider;
    private _changeHandler: NSObject;

    public createNativeView() {
        return UISlider.new();
    }

    public initNativeView(): void {
        super.initNativeView();
        const nativeView = this.nativeViewProtected;
        // default values
        nativeView.minimumValue = 0;
        nativeView.maximumValue = this.maxValue;
        this._changeHandler = SliderChangeHandlerImpl.initWithOwner(new WeakRef(this));
        nativeView.addTargetActionForControlEvents(this._changeHandler, "sliderValueChanged", UIControlEvents.ValueChanged);
    }

    public disposeNativeView() {
        this._changeHandler = null;
        super.disposeNativeView();
    }

    get ios(): UISlider {
        return this.nativeViewProtected;
    }

    [valueProperty.getDefault](): number {
        return 0;
    }
    [valueProperty.setNative](value: number) {
        this.ios.value = value;
    }
    [minValueProperty.getDefault](): number {
        return 0;
    }
    [minValueProperty.setNative](value: number) {
        this.ios.minimumValue = value;
    }
    [maxValueProperty.getDefault](): number {
        return 100;
    }
    [maxValueProperty.setNative](value: number) {
        this.ios.maximumValue = value;
    }

    [colorProperty.getDefault](): UIColor {
        return this.ios.thumbTintColor;
    }
    [colorProperty.setNative](value: UIColor | Color) {
        let color = value instanceof Color ? value.ios : value;
        this.ios.thumbTintColor = color;
    }

    [backgroundColorProperty.getDefault](): UIColor {
        return this.ios.minimumTrackTintColor;
    }
    [backgroundColorProperty.setNative](value: UIColor | Color) {
        let color = value instanceof Color ? value.ios : value;
        this.ios.minimumTrackTintColor = color;
    }

    [backgroundInternalProperty.getDefault](): Background {
        return null;
    }
    [backgroundInternalProperty.setNative](value: Background) {
        //
    }
}