/**
 * GameLib.EntityManager
 * @param entities GameLib.D3.Entity[]
 * @constructor
 */
GameLib.EntityManager = function(entities) {

    GameLib.API.EntityManager.call(
        this,
        entities
    );

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

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

/**
 * Creates an Entity Manager instance
 * @returns {*}
 */
GameLib.EntityManager.prototype.createInstance = function() {

    var instance = null;

    if (typeof 'require' != 'undefined') {
        instance = require('tiny-ecs').EntityManager;
    } else {
        instance = EntityManager.EntityManager;
    }

    return instance;
};

/**
 * Creates an GameLib.Entity
 * @returns {*}
 */
GameLib.EntityManager.prototype.createEntity = function() {

    var entity = new GameLib.Entity(this);

    this.entities.push(entity);

    return entity;
};

/**
 * Removes an entity
 * @param entity GameLib.D3.Entity
 * @returns bool true if successful
 */
GameLib.EntityManager.prototype.removeEntity = function(entity) {

    entity.instance.remove();

    var index = this.entities.indexOf(entity);

    if (index == -1) {
        console.log('failed to remove entity : ', entity);
        return false;
    }

    this.entities.splice(index, 1);

    return true;
};

/**
 * Adds a component to an entity
 * @param entity GameLib.D3.Entity
 * @param component Object.constructor
 */
GameLib.EntityManager.prototype.entityAddComponent = function(entity, component) {
    this.instance.entityAddComponent(entity.instance, component);
};

/**
 * Returns all the objects with the following components
 * @param components GameLib.Component[]
 */
GameLib.EntityManager.prototype.queryComponents = function(components) {
    return this.instance.queryComponents(components);
};

/**
 * Converts a GameLib.Entity to GameLib.API.Entity
 * @returns {GameLib.API.Entity}
 */
GameLib.EntityManager.prototype.toApiEntityManager = function() {

    //TODO: refactor / fix
    // var apiEntity = new GameLib.API.Entity(
    //     this.id,
    //     this.name,
    //     GameLib.Utils.IdArrayOrEmptyArray(this.components),
    //     this.position.toApiVector(),
    //     this.quaternion.toApiQuaternion(),
    //     this.scale.toApiVector(),
    //     GameLib.Utils.IdOrNull(this.parentScene),
    //     GameLib.Utils.IdOrNull(this.mesh)
    // );
    //
    // return apiEntity;
};

/**
 *
 * @param graphics GameLib.D3.Graphics
 * @param objectEntity Object
 * @constructor
 */
GameLib.EntityManager.FromObjectEntityManager = function(graphics, objectEntity) {

    //TODO: refactor /fix
    // var apiEntity = new GameLib.API.Entity(
    //     objectEntity.id,
    //     objectEntity.name,
    //     objectEntity.components,
    //     new GameLib.API.Vector3(
    //         objectEntity.position.x,
    //         objectEntity.position.y,
    //         objectEntity.position.z
    //     ),
    //     new GameLib.API.Quaternion(
    //         objectEntity.quaternion.x,
    //         objectEntity.quaternion.y,
    //         objectEntity.quaternion.z,
    //         objectEntity.quaternion.w,
    //         new GameLib.API.Vector3(
    //             objectEntity.quaternion.axis.x,
    //             objectEntity.quaternion.axis.y,
    //             objectEntity.quaternion.axis.z
    //         )
    //     ),
    //     new GameLib.API.Vector3(
    //         objectEntity.scale.x,
    //         objectEntity.scale.y,
    //         objectEntity.scale.z
    //     ),
    //     objectEntity.parentScene,
    //     objectEntity.mesh
    // );
    //
    // return new GameLib.Entity(
    //     graphics,
    //     apiEntity
    // );
};

/**
 * Links object Ids to actual objects
 * @param idToObject
 */
GameLib.EntityManager.prototype.linkObjects = function(idToObject) {

    // TODO: fix
    // this.components.forEach(
    //     function(currentValue, index, array) {
    //
    //         if (!idToObject[currentValue]) {
    //             //throw new Error('Unable to locate component with ID: ' + currentValue);
    //             console.log('Unable to locate component with ID: ' + currentValue + ' - it must have been deleted before');
    //             array.splice(index, 1);
    //         } else {
    //             array[index] = idToObject[currentValue];
    //         }
    //
    //
    //     }.bind(this)
    // );

};