/**
 * Spline constructor
 * @param graphics GameLib.D3.Graphics
 * @param apiSpline GameLib.D3.API.Spline
 * @constructor
 */
GameLib.D3.Spline = function RuntimeSpline(
    graphics,
    apiSpline
) {
    this.graphics = graphics;
    this.graphics.isNotThreeThrow();

    GameLib.D3.API.Spline.call(
        this,
        apiSpline.id,
        apiSpline.name,
        apiSpline.vertices
    );

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

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

/**
 * Creates an instance spline
 * @param update boolean
 */
GameLib.D3.Spline.prototype.createInstance = function(update) {

    if (update) {
        return this.instance;
    }

    var vertices = this.vertices.map(
        function (vertex) {
            return vertex.instance;
        }
    );

    return new THREE.CatmullRomCurve3(vertices);
};

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

/**
 * Gets the current point from the spline at the proper value
 * @param proper Number (fraction between 0 and 1 indicating position on spline)
 * @returns {*}
 */
GameLib.D3.Spline.prototype.getPointAt = function(proper) {
    var point = this.instance.getPointAt(proper);
    return new GameLib.Vector3(
        this.graphics,
        this,
        new GameLib.API.Vector3(point.x, point.y, point.z),
        0.1
    );
};

/**
 * Converts a GameLib.D3.Spline to GameLib.D3.API.Spline
 * @returns {GameLib.D3.API.Spline}
 */
GameLib.D3.Spline.prototype.toApiComponent = function() {

    return new GameLib.D3.API.Spline(
        this.id,
        this.name,
        this.vertices.map(
            function (vertex) {
                return vertex.toApiVertex()
            }
        )
    );

};

/**
 * Returns a GameLib.D3.Spline from a spline Object
 * @param graphics GameLib.D3.Graphics
 * @param objectComponent Object
 * @returns {GameLib.D3.Spline}
 * @constructor
 */
GameLib.D3.Spline.FromObjectComponent = function(
    graphics,
    objectComponent
) {
    var apiSpline =  new GameLib.D3.API.Spline(
        objectComponent.id,
        objectComponent.name,
        objectComponent.vertices.map(
            function (objectVertex) {
                return GameLib.D3.Vertex.FromObjectVertex(graphics, objectVertex);
            }
        )
    );

    return new GameLib.D3.Spline(
        graphics,
        apiSpline
    );
};