/**
 * Runtime apiVector4 for updating instance objects
 * @param graphics GameLib.D3.Graphics
 * @param apiVector4 GameLib.API.Vector4
 * @param parentObject GameLib.*
 * @param grain Number
 * @constructor
 */
GameLib.Vector4 = function (
    graphics,
    apiVector4,
    parentObject,
    grain
) {

    this.graphics = graphics;
    this.graphics.isNotThreeThrow();

    if (GameLib.Utils.UndefinedOrNull(apiVector4)) {
        apiVector4 = {};
    }

    GameLib.API.Vector4.call(
        this,
        apiVector4.x,
        apiVector4.y,
        apiVector4.z,
        apiVector4.w
    );

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

    if (GameLib.Utils.UndefinedOrNull(grain)) {
        grain = 0.001;
    }
    this.grain = grain;

    this.instance = this.createInstance();
};

GameLib.Vector4.prototype = Object.create(GameLib.API.Vector4.prototype);
GameLib.Vector4.prototype.constructor = GameLib.Vector4;

/**
 * Creates an instance vector3
 * @param update
 * @returns {*}
 */
GameLib.Vector4.prototype.createInstance = function(update) {

    var instance = null;

    if (update) {
        instance = this.instance;
        instance.x = this.x;
        instance.y = this.y;
        instance.z = this.z;
        instance.w = this.w;
    } else {
        instance = new THREE.Quaternion(this.x, this.y, this.z, this.w);
    }

    return instance;
};

/**
 * Updates the instance vector, calls updateInstance on the parent object
 */
GameLib.Vector4.prototype.updateInstance = function() {

    this.createInstance(true);

    if (this.parentObject &&
        this.parentObject.updateInstance) {
        this.parentObject.updateInstance();
    }
};

/**
 * Converts runtime vector to API Vector
 */
GameLib.Vector4.prototype.toApiVector = function() {
    return new GameLib.API.Vector4(
        this.x,
        this.y,
        this.z,
        this.w
    );
};