/**
 * Entity Runtime
 * @param graphics GameLib.D3.Graphics
 * @param apiEntity GameLib.D3.API.Entity
 * @constructor
 */
GameLib.D3.Entity = function Entity(
    graphics,
    apiEntity
) {
    for (var property in apiEntity) {
        if (apiEntity.hasOwnProperty(property)) {
            this[property] = apiEntity[property];
        }
    }

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

    this.position = new GameLib.D3.Vector3(
        this.graphics,
        this,
        this.position
    );

    this.quaternion = new GameLib.D3.Quaternion(
        this.graphics,
        this,
        this.quaternion
    );

    this.scale = new GameLib.D3.Vector3(
        this.graphics,
        this,
        this.scale
    );

};

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

    return new GameLib.D3.API.Entity(
        this.id,
        this.name,
        this.ids,
        this.position.toApiVector(),
        this.quaternion.toApiQuaternion(),
        this.scale.toApiVector(),
        GameLib.D3.Utils.IdOrNull(this.parentScene),
        GameLib.D3.Utils.IdOrNull(this.mesh)
    );
};

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

    var apiEntity = new GameLib.D3.API.Entity(
        objectEntity.id,
        objectEntity.name,
        objectEntity.ids,
        new GameLib.D3.API.Vector3(
            objectEntity.position.x,
            objectEntity.position.y,
            objectEntity.position.z
        ),
        new GameLib.D3.API.Quaternion(
            objectEntity.quaternion.x,
            objectEntity.quaternion.y,
            objectEntity.quaternion.z,
            objectEntity.quaternion.w,
            new GameLib.D3.API.Vector3(
                objectEntity.quaternion.axis.x,
                objectEntity.quaternion.axis.y,
                objectEntity.quaternion.axis.z
            )
        ),
        new GameLib.D3.API.Vector3(
            objectEntity.scale.x,
            objectEntity.scale.y,
            objectEntity.scale.z
        ),
        objectEntity.parentScene,
        objectEntity.mesh
    );

    return new GameLib.D3.Entity(
        graphics,
        apiEntity
    );
};

/**
 * Updates the Entity and it's components
 * @param deltaTime Number
 */
GameLib.D3.Entity.prototype.update = function(
    deltaTime
) {
    for(var c in this.ids) {
        var id = this.ids[c];
        var component = this.parentScene.idToObject[id];
        if(component && component.onUpdate) {
            component.onUpdate(deltaTime, this);
        }
    }

    // todo: maybe we only need to call this AFTER late update
    this.updateMesh();

    this.onUpdate(deltaTime);
};

GameLib.D3.Entity.prototype.updateMesh = function() {

    if (this.mesh) {

        /**
         * Normalize to prevent stretching
         */
        this.quaternion.normalize();

        this.mesh.position.x    = this.position.x;
        this.mesh.position.y    = this.position.y;
        this.mesh.position.z    = this.position.z;

        this.mesh.scale.x       = this.scale.x;
        this.mesh.scale.y       = this.scale.y;
        this.mesh.scale.z       = this.scale.z;

        this.mesh.quaternion.x    = this.quaternion.x;
        this.mesh.quaternion.y    = this.quaternion.y;
        this.mesh.quaternion.z    = this.quaternion.z;
        this.mesh.quaternion.w    = this.quaternion.w;

        this.mesh.updateInstance();
    }
};

/**
* Late updates the Entity and it's components
* @param deltaTime Number
*/
GameLib.D3.Entity.prototype.lateUpdate = function(
    deltaTime
) {
    for(var c in this.ids) {
        var id = this.ids[c];
        var component = this.parentScene.idToObject[id];
        if(component && component.onLateUpdate) {
            component.onLateUpdate(deltaTime, this);
        }
    }

    this.updateMesh();

    this.onLateUpdate(deltaTime);
};

/**
* Gets called when the entity was registered with it's parent scene
* @param parentScene GameLib.D3.Scene
*/
GameLib.D3.Entity.prototype.register = function(
    parentScene
) {
    // this.parentScene = parentScene;
    //
    // if (this.mesh && this.mesh.id != null && parentScene.meshIdToMesh[this.mesh.id]) {
    //     parentScene.instance.add(parentScene.meshIdToMesh[this.mesh.id]);
    //     this.mesh = parentScene.meshIdToMesh[this.id];
    // }

    this.onRegistered(this.parentScene);
};

/**
 * Add an already registered component to the entity
 * @param id Number
 */
GameLib.D3.Entity.prototype.addComponentId = function(
    id
) {
    this.ids.push(id);
};

/**
 * Adds a components to the entity and registers it with the entity's parent scene
 * @param component GameLib.D3.ComponentInterface
 */
GameLib.D3.Entity.prototype.addComponent = function(
    component
) {
    this.parentScene.registerComponent(component);

    this.ids.push(component.id);

    if(component.setParentEntity && typeof component.setParentEntity == 'function') {
        component.setParentEntity(this.parentScene, this);
    }
};

GameLib.D3.Entity.prototype.removeComponent = function(component) {
    if(component && component.id && this.parentScene.idToObject[component.id]) {
        this.ids = this.ids.splice(this.ids.indexOf(component), 1);
        delete this.parentScene.idToObject[component.id];
    }
};

GameLib.D3.Entity.prototype.getComponent = function(
    componentType
) {
    for (var componentId in this.ids) {
        if (this.ids.hasOwnProperty(componentId)) {
            var id = this.ids[componentId];
            var component = this.parentScene.idToObject[id];
            if (component instanceof componentType) {
                return component;
            }
        }
    }

    return null;
};

///////////////////////// Methods to override //////////////////////////

GameLib.D3.Entity.prototype.onUpdate = function(
    deltaTime
) {

};

GameLib.D3.Entity.prototype.onLateUpdate = function(
    deltaTime
) {

};

GameLib.D3.Entity.prototype.onRegistered = function(
    parentScene
) {

};

GameLib.D3.Entity.prototype.linkObjects = function(idToObject) {
    /**
     * @param scene        GameLib.D3.Scene
     * @param mesh          GameLib.D3.Mesh
     */
    GameLib.D3.Utils.Link('parentScene',   idToObject, this, this.parentScene);
    GameLib.D3.Utils.Link('mesh',           idToObject, this, this.mesh);

};