module BABYLON {
    // Adds the parser to the scene parsers.
    AbstractScene.AddParser(SceneComponentConstants.NAME_LENSFLARESYSTEM, (parsedData: any, scene: Scene, container: AssetContainer, rootUrl: string) => {
        // Lens flares
        if (parsedData.lensFlareSystems !== undefined && parsedData.lensFlareSystems !== null) {
            for (let index = 0, cache = parsedData.lensFlareSystems.length; index < cache; index++) {
                var parsedLensFlareSystem = parsedData.lensFlareSystems[index];
                var lf = LensFlareSystem.Parse(parsedLensFlareSystem, scene, rootUrl);
                container.lensFlareSystems.push(lf);
            }
        }
    });

    export interface AbstractScene {
        /**
         * The list of lens flare system added to the scene
         * @see http://doc.babylonjs.com/how_to/how_to_use_lens_flares
         */         
        lensFlareSystems: Array<LensFlareSystem>;

        /**
         * Removes the given lens flare system from this scene.
         * @param toRemove The lens flare system to remove
         * @returns The index of the removed lens flare system
         */          
        removeLensFlareSystem(toRemove: LensFlareSystem): number;

        /**
         * Adds the given lens flare system to this scene
         * @param newLensFlareSystem The lens flare system to add
         */          
        addLensFlareSystem(newLensFlareSystem: LensFlareSystem): void;

        /**
         * Gets a lens flare system using its name
         * @param name defines the name to look for
         * @returns the lens flare system or null if not found
         */
        getLensFlareSystemByName(name: string): Nullable<LensFlareSystem>;

        /**
         * Gets a lens flare system using its id
         * @param id defines the id to look for
         * @returns the lens flare system or null if not found
         */
        getLensFlareSystemByID(id: string): Nullable<LensFlareSystem>;
    }

    AbstractScene.prototype.getLensFlareSystemByName = function(name: string): Nullable<LensFlareSystem> {
        for (var index = 0; index < this.lensFlareSystems.length; index++) {
            if (this.lensFlareSystems[index].name === name) {
                return this.lensFlareSystems[index];
            }
        }

        return null;
    }

    AbstractScene.prototype.getLensFlareSystemByID = function(id: string): Nullable<LensFlareSystem> {
        for (var index = 0; index < this.lensFlareSystems.length; index++) {
            if (this.lensFlareSystems[index].id === id) {
                return this.lensFlareSystems[index];
            }
        }

        return null;
    }

    AbstractScene.prototype.removeLensFlareSystem = function(toRemove: LensFlareSystem): number {
        var index = this.lensFlareSystems.indexOf(toRemove);
        if (index !== -1) {
            this.lensFlareSystems.splice(index, 1);
        }
        return index;
    }

    AbstractScene.prototype.addLensFlareSystem = function(newLensFlareSystem: LensFlareSystem): void {
        this.lensFlareSystems.push(newLensFlareSystem);
    }

    /**
     * Defines the lens flare scene component responsible to manage any lens flares
     * in a given scene.
     */
    export class LensFlareSystemSceneComponent implements ISceneSerializableComponent {
        /**
         * The component name helpfull to identify the component in the list of scene components.
         */
        public readonly name = SceneComponentConstants.NAME_LENSFLARESYSTEM;

        /**
         * The scene the component belongs to.
         */
        public scene: Scene;

        /**
         * Creates a new instance of the component for the given scene
         * @param scene Defines the scene to register the component in
         */
        constructor(scene: Scene) {
            this.scene = scene;

            scene.lensFlareSystems = new Array<LensFlareSystem>();
        }

        /**
         * Registers the component in a given scene
         */
        public register(): void {
            this.scene._afterCameraDrawStage.registerStep(SceneComponentConstants.STEP_AFTERCAMERADRAW_LENSFLARESYSTEM, this, this._draw);
        }

        /**
         * Rebuilds the elements related to this component in case of
         * context lost for instance.
         */
        public rebuild(): void {
            // Nothing to do for lens flare
        }

        /**
         * Adds all the element from the container to the scene
         * @param container the container holding the elements
         */
        public addFromContainer(container: AbstractScene): void {
            if (!container.lensFlareSystems) {
                return;
            }
            container.lensFlareSystems.forEach((o) => {
                this.scene.addLensFlareSystem(o);
            });
        }

        /**
         * Removes all the elements in the container from the scene
         * @param container contains the elements to remove 
         */
        public removeFromContainer(container: AbstractScene): void {
            if (!container.lensFlareSystems) {
                return;
            }
            container.lensFlareSystems.forEach((o) => {
                this.scene.removeLensFlareSystem(o);
            });
        }

        /**
         * Serializes the component data to the specified json object
         * @param serializationObject The object to serialize to
         */
        public serialize(serializationObject: any): void {
            // Lens flares
            serializationObject.lensFlareSystems = [];
            let lensFlareSystems = this.scene.lensFlareSystems;
            for (let lensFlareSystem of lensFlareSystems) {
                serializationObject.lensFlareSystems.push(lensFlareSystem.serialize());
            }
        }

        /**
         * Disposes the component and the associated ressources.
         */
        public dispose(): void {
            let lensFlareSystems = this.scene.lensFlareSystems;
            while (lensFlareSystems.length) {
                lensFlareSystems[0].dispose();
            }
        }

        private _draw(camera: Camera): void {
            // Lens flares
            if (this.scene.lensFlaresEnabled) {                
                let lensFlareSystems = this.scene.lensFlareSystems;
                Tools.StartPerformanceCounter("Lens flares", lensFlareSystems.length > 0);
                for (let lensFlareSystem of lensFlareSystems) {
                    if ((camera.layerMask & lensFlareSystem.layerMask) !== 0) {
                        lensFlareSystem.render();
                    }
                }
                Tools.EndPerformanceCounter("Lens flares", lensFlareSystems.length > 0);
            }
        }
    }
}