/**
 * Runtime Matrix4
 * @param graphics
 * @param parentObject
 * @param matrix4
 * @param grain
 * @constructor
 */
GameLib.D3.Matrix4 = function(
    graphics,
    parentObject,
    matrix4,
    grain
) {

    for (var property in matrix4) {
        if (matrix4.hasOwnProperty(property)) {
            this[property] = matrix4[property];
        }
    }

    GameLib.D3.Utils.Extend(GameLib.D3.Matrix4, GameLib.D3.API.Matrix4);

    this.graphics = graphics;

    this.graphics.isNotThreeThrow();

    this.parentObject = parentObject;

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

    this.rows[0] = new GameLib.D3.Vector4(
        this.graphics,
        this,
        this.rows[0],
        grain
    );

    this.rows[1] = new GameLib.D3.Vector4(
        this.graphics,
        this,
        this.rows[1],
        grain
    );

    this.rows[2] = new GameLib.D3.Vector4(
        this.graphics,
        this,
        this.rows[2],
        grain
    );

    this.rows[3] = new GameLib.D3.Vector4(
        this.graphics,
        this,
        this.rows[3],
        grain
    );

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

/**
 * Creates a matrix 4 instance (currently from graphics lib)
 * @param update
 */
GameLib.D3.Matrix4.prototype.createInstance = function(update) {

    var instance = null;

    if (update) {
        instance = this.instance;
    }

    if (!instance) {
        instance = new THREE.Matrix4();
    }

    instance.set(
        this.rows[0].x,
        this.rows[0].y,
        this.rows[0].z,
        this.rows[0].w,
        this.rows[1].x,
        this.rows[1].y,
        this.rows[1].z,
        this.rows[1].w,
        this.rows[2].x,
        this.rows[2].y,
        this.rows[2].z,
        this.rows[2].w,
        this.rows[3].x,
        this.rows[3].y,
        this.rows[3].z,
        this.rows[3].w
    );

    return instance;
};

/**
 * Updates this instance
 */
GameLib.D3.Matrix4.prototype.updateInstance = function() {
    this.createInstance(true);
};

GameLib.D3.Matrix4.prototype.lookAt = function (position, target, up) {

    this.instance.lookAt(position.instance, target.instance, up.instance);

    this.rows[0].x = this.instance.elements[0];
    this.rows[0].y = this.instance.elements[1];
    this.rows[0].z = this.instance.elements[2];
    this.rows[0].w = this.instance.elements[3];

    this.rows[1].x = this.instance.elements[4];
    this.rows[1].y = this.instance.elements[5];
    this.rows[1].z = this.instance.elements[6];
    this.rows[1].w = this.instance.elements[7];

    this.rows[2].x = this.instance.elements[8];
    this.rows[2].y = this.instance.elements[9];
    this.rows[2].z = this.instance.elements[10];
    this.rows[2].w = this.instance.elements[11];

    this.rows[3].x = this.instance.elements[12];
    this.rows[3].y = this.instance.elements[13];
    this.rows[3].z = this.instance.elements[14];
    this.rows[3].w = this.instance.elements[15];

};