/**
 * Entity API Object (for storing / loading entities to and from API)
 * @constructor
 * @param id
 * @param name
 * @param entities GameLib.API.Entity[]
 * @param parentEntity
 */
GameLib.API.EntityManager = function(
    id,
    name,
    entities,
    // systems,
    parentEntity
) {
    GameLib.Component.call(
        this,
        GameLib.Component.COMPONENT_ENTITY_MANAGER,
        {
            'entities' : [GameLib.Entity]
            // 'systems' : [GameLib.System]
        },
        null,
        parentEntity
    );

    if (GameLib.Utils.UndefinedOrNull(id)) {
        id = GameLib.Utils.RandomId();
    }
    this.id = id;

    if (GameLib.Utils.UndefinedOrNull(name)) {
        name = 'Entity Manager (' + this.id + ')';
    }
    this.name = name;

    if (GameLib.Utils.UndefinedOrNull(entities)) {
        entities = [];
    }
    this.entities = entities;

	// if (GameLib.Utils.UndefinedOrNull(systems)) {
	// 	systems = [];
	// }
	// this.systems = systems;
};

GameLib.API.EntityManager.prototype = Object.create(GameLib.Component.prototype);
GameLib.API.EntityManager.prototype.constructor = GameLib.API.EntityManager;

/**
 * Creates an API entity manager from an Object entity manager
 * @param objectEntityManager
 * @constructor
 */
GameLib.API.EntityManager.FromObjectEntityManager = function(objectEntityManager) {

    var apiEntities = objectEntityManager.entities.map(
        function (objectEntity) {
            return GameLib.API.Entity.FromObjectEntity(objectEntity);
        }
    );

    // var apiSystems = objectEntityManager.systems.map(
    //     function (objectSystem) {
    //         return GameLib.API.System.FromObjectComponent(objectSystem);
    //     }
    // );

    return new GameLib.API.EntityManager(
        objectEntityManager.id,
        objectEntityManager.name,
        apiEntities,
//        apiSystems,
        objectEntityManager.parentEntity
    );
};