let app = null;
let mapContainer = null;

export function syncApp(param) {
    app = param;
}

export function syncMapContainer(param) {
    mapContainer = param;
}

export const MapEvent = Object.freeze({
    SELECTION_BOX: Symbol.for(0),
    PAN: Symbol.for(1),
})

export const getRealPosition = (x, y, mapContainer) => {
    const rect = app.view.getBoundingClientRect();
    return {
        mapX: (x - rect.left) / mapContainer.scale.x - mapContainer.x / mapContainer.scale.x,
        mapY: (y - rect.top) / mapContainer.scale.y - mapContainer.y / mapContainer.scale.y
    }
}

export const initSprite = (sprite) => {
    sprite.anchor.set(0.5);
    sprite.cursor = 'pointer';
    sprite.eventMode = 'static';
}

export const beMovable = (sprite, setDidClickSprite) => {
    sprite.off('pointerup');
    sprite.off('pointerdown');
    sprite.off('click');

    sprite.on("pointerdown", onDragStart);

    let dragTarget;
    function onDragStart(event) {
        setDidClickSprite(true);
        dragTarget = event.currentTarget;
        mapContainer.parent.off('pointermove');
        mapContainer.parent.on('pointermove', onDragMove, dragTarget);

        mapContainer.parent.off('pointerup');
        mapContainer.parent.on('pointerup', onDragEnd.bind(mapContainer));
    }

    function onDragMove(event) {
        if (this) {
            this.parent.toLocal(event.global, null, this.position);
        }
    }

    function onDragEnd() {
        if (dragTarget) {
            setDidClickSprite(false);
            this.parent.off('pointermove');
            dragTarget.alpha = 1;
            dragTarget = null;
        }
    }

}