/**
 * Entities with LookAt component looks to targetPosition (default up is 0,1,0)
 * @param graphics GameLib.D3.Graphics
 * @param parentObject
 * @param apiLookAt GameLib.D3.API.LookAt
 * @constructor
 */
GameLib.D3.LookAt = function RuntimeLookAt(
    graphics,
    parentObject,
    apiLookAt
) {
    this.graphics = graphics;
    this.graphics.isNotThreeThrow();

    if (GameLib.Utils.UndefinedOrNull(parentObject)) {
        parentObject = null;
    }
    this.parentObject = parentObject;

    GameLib.D3.API.LookAt.call(
        this,
		apiLookAt.id,
		apiLookAt.name,
		apiLookAt.currentPosition,
		apiLookAt.targetPosition,
		apiLookAt.targetPositionOffset,
		apiLookAt.rotationSpeed,
		apiLookAt.lookAtMatrix,
		apiLookAt.up,
        apiLookAt.currentRotation
    );

    this.currentPosition = new GameLib.Vector3(
        this.graphics,
        this,
        this.currentPosition
    );

    this.targetPosition = new GameLib.Vector3(
        this.graphics,
        this,
        this.targetPosition
    );

    this.targetOffset = new GameLib.Vector3(
        this.graphics,
        this,
        this.targetOffset
    );

    this.lookAtMatrix = new GameLib.Matrix4(
        this.graphics,
        this,
        this.lookAtMatrix
    );

    this.up = new GameLib.Vector3(
        this.graphics,
        this,
        this.up
    );

    this.currentRotation = new GameLib.Quaternion(
        this.graphics,
        this,
        this.currentRotation
    );
};

GameLib.D3.LookAt.prototype = Object.create(GameLib.D3.API.LookAt.prototype);
GameLib.D3.LookAt.prototype.constructor = GameLib.D3.LookAt;