// @input Component.ScreenTransform screenTransform
// @input bool dragX
// @input bool dragY 
// @input vec2 limitsHorizontal = {-1, 1}
// @input vec2 limitsVertical = {-1, 1}


var startPos = script.screenTransform.anchors.getCenter();

global.touchSystem.touchBlocking = true;

var canDrag = false;
var offset = vec2.zero();

var touchStarEvent = script.createEvent("TouchStartEvent");
touchStarEvent.bind(function (eventData) {

    var touchPos = eventData.getTouchPosition();
    if (script.screenTransform.containsScreenPoint(touchPos)) {
        var localPosition = script.screenTransform.screenPointToParentPoint(touchPos);
        offset = localPosition.sub(script.screenTransform.anchors.getCenter())
        canDrag = true;// allow dragging if the touch started in the frog area
    }
});

var event = script.createEvent("TouchMoveEvent");
event.bind(function (eventData) {
    if (canDrag) {
        var touchPos = eventData.getTouchPosition();
        var localPosition = script.screenTransform.screenPointToParentPoint(touchPos).sub(offset);
        if (!script.dragX) {
            localPosition.x = startPos.x;
        } else {
            localPosition.x = clamp(script.limitsHorizontal.x, script.limitsHorizontal.y, localPosition.x);
        }
        if (!script.dragY) {
            localPosition.y = startPos.y;
        } else {
            localPosition.y = clamp(script.limitsVertical.x, script.limitsVertical.y, localPosition.y);
        }
        script.screenTransform.anchors.setCenter(localPosition);
    }
});

var touchEndEvent = script.createEvent("TouchEndEvent");
touchEndEvent.bind(function (eventData) {
    canDrag = false;
});

function clamp(min, max, v) {
    return Math.min(Math.max(v, min), max);
}