/**
 * System takes care of updating all the entities (based on their component data)
 * @param implementation
 * @param apiSystem GameLib.API.System
 * @constructor
 */
GameLib.System = function(
    apiSystem
) {

    if (GameLib.Utils.UndefinedOrNull(apiSystem)) {
        apiSystem = {};
    }

	if (apiSystem instanceof GameLib.System) {
		return apiSystem;
	}

    GameLib.API.System.call(
		this,
		apiSystem.id,
		apiSystem.name,
		apiSystem.systemType,
		apiSystem.parentEntity
	);

    GameLib.Component.call(
        this,
        GameLib.Component.COMPONENT_SYSTEM
    );

};

GameLib.System.prototype = Object.create(GameLib.API.System.prototype);
GameLib.System.prototype.constructor = GameLib.System;

GameLib.System.SYSTEM_TYPE_NONE			    = 0x0;
GameLib.System.SYSTEM_TYPE_RENDER           = 0x1;
GameLib.System.SYSTEM_TYPE_ANIMATION        = 0x2;
GameLib.System.SYSTEM_TYPE_INPUT            = 0x4;
GameLib.System.SYSTEM_TYPE_STORAGE		    = 0x8;
GameLib.System.SYSTEM_TYPE_GUI			    = 0x10;
GameLib.System.SYSTEM_TYPE_PHYSICS		    = 0x20;
GameLib.System.SYSTEM_TYPE_LINKING		    = 0x40;
GameLib.System.SYSTEM_TYPE_CUSTOM		    = 0x80;
GameLib.System.SYSTEM_TYPE_VISUALIZATION    = 0x100;
GameLib.System.SYSTEM_TYPE_ALL              = 0xFFFF;

GameLib.System.prototype.createInstance = function() {
    //console.log('GameLib.System.prototype.createInstance();');
};

/**
 * @callback
 * @override
 */
GameLib.System.prototype.start = function() {


	if (this.systemType === GameLib.System.SYSTEM_TYPE_ANIMATION) {
		// this.pathFollowingObjects 	= GameLib.EntityManager.Instance.query([GameLib.D3.PathFollowing]);
		// this.followObjects 			= GameLib.EntityManager.Instance.query([GameLib.D3.Follow]);
		// this.meshObjects 			= GameLib.EntityManager.Instance.query([GameLib.D3.Mesh]);
		// this.lookAtObjects 			= GameLib.EntityManager.Instance.query([GameLib.D3.LookAt]);
		// this.cameraObjects 			= GameLib.EntityManager.Instance.query([GameLib.D3.Camera]);
		// this.lightObjects 			= GameLib.EntityManager.Instance.query([GameLib.D3.Light]);
	}

    this.update();

};

/**
 * @callback
 * @override
 */
GameLib.System.prototype.update = function(deltaTime) {


	if (this.systemType === GameLib.System.SYSTEM_TYPE_ANIMATION) {

		this.pathFollowingObjects.forEach(
			function(object) {
				object.update(deltaTime);
			}
		);

		this.followObjects.forEach(
			function(object) {
				object.update(deltaTime);
			}
		);

		this.lookAtObjects.forEach(
			function(object) {
				object.update(deltaTime);
			}
		);

		this.meshObjects.forEach(
			function(object) {
				object.updateInstance();
			}
		);

		this.cameraObjects.forEach(
			function(object) {
				object.updateInstance();
			}
		);

		this.lightObjects.forEach(
			function(object) {
				object.updateInstance();
			}
		);
	}



};

/**
 * @callback
 * @override
 */
GameLib.System.prototype.stop = function() {

	if (this.systemType === GameLib.System.SYSTEM_TYPE_ANIMATION) {
		// this.pathFollowingObjects 	= [];
		// this.followObjects 			= [];
		// this.meshObjects 			= [];
		// this.lookAtObjects 			= [];
		// this.cameraObjects 			= [];
		// this.lightObjects 			= [];
	}
};

/**
 * Converts runtime vector to API Vector
 * @returns {GameLib.API.System}
 */
GameLib.System.prototype.toApiObject = function() {
    return new GameLib.API.System(
        this.id,
        this.name,
        this.systemType,
        GameLib.Utils.IdOrNull(this.parentEntity)
    );
};

GameLib.System.prototype.restart = function() {
	this.stop();
	this.start();
};