/**
 * Helpers for displaying outlines or making 'invisible' scene objects visible
 * @param id
 * @param object GameLib.D3.Object
 * @param name
 * @param graphics
 * @param helperType
 * @constructor
 */
GameLib.D3.Helper = function Helper(
    id,
    object,
    helperType,
    name,
    graphics
) {
    if (GameLib.Utils.UndefinedOrNull(id)) {
        id = GameLib.Utils.RandomId();
    }
    this.id = id;

    if (GameLib.Utils.UndefinedOrNull(object)) {
        throw new Error('Cannot create helpers for unknown objects');
    }
    this.object = object;

    if (GameLib.Utils.UndefinedOrNull(helperType)) {
        helperType = GameLib.D3.Helper.HELPER_TYPE_EDGES;
    }
    this.helperType = helperType;

    if (GameLib.Utils.UndefinedOrNull(name)) {
        name = 'Helper (' + this.helperType + ')';
    }
    this.name = name;

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

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

/**
 * Helper types
 * @type {string}
 */
GameLib.D3.Helper.HELPER_TYPE_EDGES             = 'edges';
GameLib.D3.Helper.HELPER_TYPE_DIRECTIONAL_LIGHT = 'directional-light';
GameLib.D3.Helper.HELPER_TYPE_SPOT_LIGHT        = 'spot-light';
GameLib.D3.Helper.HELPER_TYPE_POINT_LIGHT       = 'point-light';
GameLib.D3.Helper.HELPER_TYPE_WIREFRAME         = 'wireframe';
GameLib.D3.Helper.HELPER_TYPE_SKELETON          = 'skeleton';


/**
 * Creates a helper instance
 * @param update
 */
GameLib.D3.Helper.prototype.createInstance = function(update) {

    var instance = null;

    if (this.helperType == GameLib.D3.Helper.HELPER_TYPE_EDGES) {
        instance = new THREE.WireframeHelper(this.object.instance, 0x007700);
    }

    if (this.helperType == GameLib.D3.Helper.HELPER_TYPE_DIRECTIONAL_LIGHT) {
        instance = new THREE.DirectionalLightHelper(this.object.instance);
    }

    if (this.helperType == GameLib.D3.Helper.HELPER_TYPE_POINT_LIGHT) {
        instance = new THREE.PointLightHelper(this.object.instance, 1);
    }

    if (this.helperType == GameLib.D3.Helper.HELPER_TYPE_SPOT_LIGHT) {
        instance = new THREE.SpotLightHelper(this.object.instance);
    }

    if (this.helperType == GameLib.D3.Helper.HELPER_TYPE_WIREFRAME) {
        instance = new THREE.WireframeHelper(this.object.instance, 0x007700);
    }

    if (this.helperType == GameLib.D3.Helper.HELPER_TYPE_SKELETON) {
        instance = new THREE.SkeletonHelper(this.object.skeleton.instance);
    }

    if (!instance) {
        throw new Error('Unsupported helper type: ' + this.helperType);
    }

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

    return instance;
};