import {
    GestureEventData,
    RotationGestureEventData,
    GestureTypes,
    SwipeGestureEventData,
    PanGestureEventData,
    PinchGestureEventData,
    GestureStateTypes
} from "tns-core-modules/ui/gestures";
import { Button } from "tns-core-modules/ui/button";
import { Label } from "tns-core-modules/ui/label";
import { Page } from "tns-core-modules/ui/page";
import { StackLayout } from "tns-core-modules/ui/layouts/stack-layout";
import { screen, isAndroid } from "tns-core-modules/platform";

export function createPage() {
    const stack = new StackLayout();
    var stopButton = new Button();
    if (isAndroid) {
        stopButton.height = 30;
        stopButton.fontSize = 8;
    }
    stopButton.text = "Stop Detecting Gestures";
    stopButton.automationText = "stopGesturesDetecting";
    stack.addChild(stopButton);

    const labelHeight = Math.round(screen.mainScreen.heightPixels / (10 * screen.mainScreen.scale));

    const tapLabel = createLabel("Tap here", labelHeight);
    stack.addChild(tapLabel);

    const doubleTapLabel = createLabel("Double Tap here", labelHeight);
    stack.addChild(doubleTapLabel);

    const longPressLabel = createLabel("Long Press here", labelHeight);
    stack.addChild(longPressLabel);

    const tapAndDoubleTapLabel = createLabel("Tap or Double Tap", labelHeight, true);
    stack.addChild(tapAndDoubleTapLabel);

    const swipeLabel = createLabel("Swipe here", labelHeight, true);
    stack.addChild(swipeLabel);

    const panLabel = createLabel("Pan here", labelHeight, true);
    stack.addChild(panLabel);

    const pinchLabel = createLabel("Pinch here", labelHeight, true);
    stack.addChild(pinchLabel);

    const rotationLabel = createLabel("Rotate here", labelHeight, true);
    stack.addChild(rotationLabel);

    stopButton.on("tap", function () {
        observer1.disconnect();
        observer2.disconnect();
        observer3.disconnect();
        observer4.disconnect();
        observer5.disconnect();
        observer6.disconnect();
        observer7.disconnect();
        observer8.disconnect();
        observer9.disconnect();
        tapLabel.text = "Gestures detection disabled";
        tapLabel.automationText = "Gestures detection disabled";
        doubleTapLabel.text = "Gestures detection disabled";
        doubleTapLabel.automationText = "Gestures detection disabled";
        longPressLabel.text = "Gestures detection disabled";
        longPressLabel.automationText = "Gestures detection disabled";
        swipeLabel.text = "Gestures detection disabled";
        swipeLabel.automationText = "Gestures detection disabled";
        panLabel.text = "Gestures detection disabled";
        panLabel.automationText = "Gestures detection disabled";
        pinchLabel.text = "Gestures detection disabled";
        pinchLabel.automationText = "Gestures detection disabled";
        rotationLabel.text = "Gestures detection disabled";
        rotationLabel.automationText = "Gestures detection disabled";
        tapAndDoubleTapLabel.text = "Gestures detection disabled";
        tapAndDoubleTapLabel.automationText = "Gestures detection disabled";
    });

    tapLabel.on(GestureTypes[GestureTypes.tap], function (args: GestureEventData) {
        tapLabel.text = "Tap gesture detected, " + (args.object === tapLabel);
    });

    const observer1 = tapLabel.getGestureObservers(GestureTypes.tap)[0];

    doubleTapLabel.on(GestureTypes[GestureTypes.doubleTap], function (args: GestureEventData) {
        doubleTapLabel.text = "Double Tap gesture detected, " + (args.object === doubleTapLabel);
    });

    const observer2 = doubleTapLabel.getGestureObservers(GestureTypes.doubleTap)[0];

    longPressLabel.on(GestureTypes[GestureTypes.longPress], function (args: GestureEventData) {
        longPressLabel.text = "Long Press gesture detected, " + (args.object === longPressLabel);
    });

    const observer3 = longPressLabel.getGestureObservers(GestureTypes.longPress)[0];

    swipeLabel.on(GestureTypes[GestureTypes.swipe], function (args: SwipeGestureEventData) {
        swipeLabel.text = "Swipe Direction: " + args.direction + ", " + (args.object === swipeLabel); // + getStateAsString(args.state);
    });

    const observer4 = swipeLabel.getGestureObservers(GestureTypes.swipe)[0];

    panLabel.on(GestureTypes[GestureTypes.pan], function (args: PanGestureEventData) {
        panLabel.text = "Pan deltaX:" + Math.round(args.deltaX) + "; deltaY:" + Math.round(args.deltaY) + ";" + ", " + (args.object === panLabel) + getStateAsString(args.state);
    });

    const observer5 = panLabel.getGestureObservers(GestureTypes.pan)[0];

    pinchLabel.on(GestureTypes[GestureTypes.pinch], function (args: PinchGestureEventData) {
        pinchLabel.text = "Pinch Scale: " + Math.round(args.scale) + ", " + (args.object === pinchLabel) + getStateAsString(args.state);
    });

    const observer6 = pinchLabel.getGestureObservers(GestureTypes.pinch)[0];

    rotationLabel.on(GestureTypes[GestureTypes.rotation], function (args: RotationGestureEventData) {
        rotationLabel.text = "Rotation: " + Math.round(args.rotation) + ", " + (args.object === rotationLabel) + getStateAsString(args.state);
    });

    const observer7 = rotationLabel.getGestureObservers(GestureTypes.rotation)[0];

    tapAndDoubleTapLabel.on(GestureTypes[GestureTypes.doubleTap], function (args: GestureEventData) {
        tapAndDoubleTapLabel.text = "Last action: Double tap gesture, " + (args.object === tapAndDoubleTapLabel);
    });

    const observer8 = tapAndDoubleTapLabel.getGestureObservers(GestureTypes.doubleTap)[0];

    tapAndDoubleTapLabel.on(GestureTypes[GestureTypes.tap], function (args: GestureEventData) {
        tapAndDoubleTapLabel.text = "Last action: Tap gesture, " + (args.object === tapAndDoubleTapLabel);
    });

    const observer9 = tapAndDoubleTapLabel.getGestureObservers(GestureTypes.tap)[0];

    const page = new Page();
    page.content = stack;
    
    return page;
}

function getStateAsString(state: GestureStateTypes): string {
    const states = new Array<string>();
    if (state === GestureStateTypes.began) {
        states.length = 0;
        states.push("began");
    } else if (state === GestureStateTypes.cancelled) {
        states.push("cancelled");
    } else if (state === GestureStateTypes.changed) {
        if (states.indexOf("changed") === -1) {
            states.push("changed");
        }
    } else if (state === GestureStateTypes.ended) {
        states.push("ended");
    }

    return ", states: " + states.join(",");
}

function createLabel(text: string, labelHeight: number, shouldWrap = false) {
    const label = new Label();
    label.height = labelHeight;
    label.text = text;
    label.textWrap = shouldWrap;
    label.borderColor = "green";
    label.borderWidth = 1;

    return label;
}