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

    for (var property in apiQuaternion) {
        if (apiQuaternion.hasOwnProperty(property)) {
            this[property] = apiQuaternion[property];
        }
    }

    GameLib.D3.Utils.Extend(GameLib.D3.Quaternion, GameLib.D3.API.Quaternion);

    this.graphics = graphics;

    this.graphics.isNotThreeThrow();

    this.parentObject = parentObject;

    if (GameLib.D3.Utils.UndefinedOrNull(grain)) {
        grain = 0.001;
    }
    this.grain = grain;

    this.axis = new GameLib.D3.Vector3(
        this.graphics,
        this,
        this.axis,
        0.001
    );

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

/**
 * Creates an instance quaternion
 * @param update
 * @returns {*}
 */
GameLib.D3.Quaternion.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.D3.Quaternion.prototype.updateInstance = function() {

    this.createInstance(true);

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

/**
 * Converts runtime quaternion to API quaternion
 * @returns {*}
 */
GameLib.D3.Quaternion.prototype.toApiQuaternion = function() {
    return new GameLib.D3.API.Quaternion(
        this.x,
        this.y,
        this.z,
        this.w,
        this.axis.toApiVector(),
        this.angle
    );
};

GameLib.D3.Quaternion.prototype.normalize = function () {

    this.updateInstance();

    this.instance.normalize();

    this.x = this.instance.x;
    this.y = this.instance.y;
    this.z = this.instance.z;
    this.w = this.instance.w;

    return this;
};

/**
 *
 * @param matrix4 GameLib.D3.Matrix4
 */
GameLib.D3.Quaternion.prototype.setFromRotationMatrix = function(matrix4) {

    this.instance.setFromRotationMatrix(matrix4.instance);

    this.x = this.instance.x;
    this.y = this.instance.y;
    this.z = this.instance.z;
    this.w = this.instance.w;
};

/**
 *
 * @param quaternion GameLib.D3.Quaternion
 * @param t
 * @returns {GameLib.D3.Quaternion}
 */
GameLib.D3.Quaternion.prototype.slerp = function (quaternion, t) {

    this.updateInstance();

    this.instance.slerp(quaternion.instance, t);

    this.x = this.instance.x;
    this.y = this.instance.y;
    this.z = this.instance.z;
    this.w = this.instance.w;

    return this;
};