module BABYLON {
    var serializedGeometries: Geometry[] = [];
    var serializeGeometry = (geometry: Geometry, serializationGeometries: any): any => {
        if (serializedGeometries[geometry.id]) {
            return;
        }

        if (geometry.doNotSerialize) {
            return;
        }

        if (geometry instanceof Geometry.Primitives.Box) {
            serializationGeometries.boxes.push(geometry.serialize());
        }
        else if (geometry instanceof Geometry.Primitives.Sphere) {
            serializationGeometries.spheres.push(geometry.serialize());
        }
        else if (geometry instanceof Geometry.Primitives.Cylinder) {
            serializationGeometries.cylinders.push(geometry.serialize());
        }
        else if (geometry instanceof Geometry.Primitives.Torus) {
            serializationGeometries.toruses.push(geometry.serialize());
        }
        else if (geometry instanceof Geometry.Primitives.Ground) {
            serializationGeometries.grounds.push(geometry.serialize());
        }
        else if (geometry instanceof Geometry.Primitives.Plane) {
            serializationGeometries.planes.push(geometry.serialize());
        }
        else if (geometry instanceof Geometry.Primitives.TorusKnot) {
            serializationGeometries.torusKnots.push(geometry.serialize());
        }
        else if (geometry instanceof Geometry.Primitives._Primitive) {
            throw new Error("Unknown primitive type");
        }
        else {
            serializationGeometries.vertexData.push(geometry.serializeVerticeData());
        }

        serializedGeometries[geometry.id] = true;
    };

    var serializeMesh = (mesh: Mesh, serializationScene: any): any => {
        var serializationObject: any = {};

        // Geometry      
        var geometry = mesh._geometry;      
        if (geometry) {
            if (!mesh.getScene().getGeometryByID(geometry.id)) {
                // Geometry was in the memory but not added to the scene, nevertheless it's better to serialize to be able to reload the mesh with its geometry
                serializeGeometry(geometry, serializationScene.geometries);
            }
        }

        // Custom
        if (mesh.serialize) {
            mesh.serialize(serializationObject);
        }

        return serializationObject;
    };

    var finalizeSingleMesh = (mesh: Mesh, serializationObject: any) => {
        //only works if the mesh is already loaded
        if (mesh.delayLoadState === Engine.DELAYLOADSTATE_LOADED || mesh.delayLoadState === Engine.DELAYLOADSTATE_NONE) {
            //serialize material
            if (mesh.material) {
                if (mesh.material instanceof StandardMaterial) {
                    serializationObject.materials = serializationObject.materials || [];
                    if (!serializationObject.materials.some(mat => (mat.id === mesh.material.id))) {
                        serializationObject.materials.push(mesh.material.serialize());
                    }
                } else if (mesh.material instanceof MultiMaterial) {
                    serializationObject.multiMaterials = serializationObject.multiMaterials || [];
                    if (!serializationObject.multiMaterials.some(mat => (mat.id === mesh.material.id))) {
                        serializationObject.multiMaterials.push(mesh.material.serialize());
                    }

                }
            }
            //serialize geometry
            var geometry = mesh._geometry;
            if (geometry) {
                if (!serializationObject.geometries) {
                    serializationObject.geometries = {};

                    serializationObject.geometries.boxes = [];
                    serializationObject.geometries.spheres = [];
                    serializationObject.geometries.cylinders = [];
                    serializationObject.geometries.toruses = [];
                    serializationObject.geometries.grounds = [];
                    serializationObject.geometries.planes = [];
                    serializationObject.geometries.torusKnots = [];
                    serializationObject.geometries.vertexData = [];
                }

                serializeGeometry(geometry, serializationObject.geometries);
            }
            // Skeletons
            if (mesh.skeleton) {
                serializationObject.skeletons = serializationObject.skeletons || [];
                serializationObject.skeletons.push(mesh.skeleton.serialize());
            }

            //serialize the actual mesh
            serializationObject.meshes = serializationObject.meshes || [];
            serializationObject.meshes.push(serializeMesh(mesh, serializationObject));
        }
    }

    export class SceneSerializer {
        public static ClearCache(): void {
            serializedGeometries = [];
        }

        public static Serialize(scene: Scene): any {
            var serializationObject: any = {};

            SceneSerializer.ClearCache();

            // Scene
            serializationObject.useDelayedTextureLoading = scene.useDelayedTextureLoading;
            serializationObject.autoClear = scene.autoClear;
            serializationObject.clearColor = scene.clearColor.asArray();
            serializationObject.ambientColor = scene.ambientColor.asArray();
            serializationObject.gravity = scene.gravity.asArray();
            serializationObject.collisionsEnabled = scene.collisionsEnabled;
            serializationObject.workerCollisions = scene.workerCollisions;

            // Fog
            if (scene.fogMode && scene.fogMode !== 0) {
                serializationObject.fogMode = scene.fogMode;
                serializationObject.fogColor = scene.fogColor.asArray();
                serializationObject.fogStart = scene.fogStart;
                serializationObject.fogEnd = scene.fogEnd;
                serializationObject.fogDensity = scene.fogDensity;
            }

            //Physics
            if (scene.isPhysicsEnabled()) {
                serializationObject.physicsEnabled = true;
                serializationObject.physicsGravity = scene.getPhysicsEngine().gravity.asArray();
                serializationObject.physicsEngine = scene.getPhysicsEngine().getPhysicsPluginName();
            }

            // Metadata
            if (scene.metadata) {
                serializationObject.metadata = scene.metadata;
            }

            // Morph targets
            serializationObject.morphTargetManagers = [];
            for (var abstractMesh of scene.meshes) {
                var manager = (<Mesh>abstractMesh).morphTargetManager;
                
                if (manager) {
                    serializationObject.morphTargetManagers.push(manager.serialize());
                }
            }            

            // Lights
            serializationObject.lights = [];
            var index: number;
            var light: Light;
            for (index = 0; index < scene.lights.length; index++) {
                light = scene.lights[index];

                if (!light.doNotSerialize) {
                    serializationObject.lights.push(light.serialize());
                }
            }

            // Cameras
            serializationObject.cameras = [];
            for (index = 0; index < scene.cameras.length; index++) {
                var camera = scene.cameras[index];

                if (!camera.doNotSerialize) {
                    serializationObject.cameras.push(camera.serialize());
                }
            }

            if (scene.activeCamera) {
                serializationObject.activeCameraID = scene.activeCamera.id;
            }

            // Animations
            Animation.AppendSerializedAnimations(scene, serializationObject);

            // Materials
            serializationObject.materials = [];
            serializationObject.multiMaterials = [];
            var material: Material;
            for (index = 0; index < scene.materials.length; index++) {
                material = scene.materials[index];
                if (!material.doNotSerialize) {
                    serializationObject.materials.push(material.serialize());
                }
            }

            // MultiMaterials
            serializationObject.multiMaterials = [];
            for (index = 0; index < scene.multiMaterials.length; index++) {
                var multiMaterial = scene.multiMaterials[index];
                serializationObject.multiMaterials.push(multiMaterial.serialize());
            }

            // Skeletons
            serializationObject.skeletons = [];
            for (index = 0; index < scene.skeletons.length; index++) {
                serializationObject.skeletons.push(scene.skeletons[index].serialize());
            }

            // Geometries
            serializationObject.geometries = {};

            serializationObject.geometries.boxes = [];
            serializationObject.geometries.spheres = [];
            serializationObject.geometries.cylinders = [];
            serializationObject.geometries.toruses = [];
            serializationObject.geometries.grounds = [];
            serializationObject.geometries.planes = [];
            serializationObject.geometries.torusKnots = [];
            serializationObject.geometries.vertexData = [];

            serializedGeometries = [];
            var geometries = scene.getGeometries();
            for (index = 0; index < geometries.length; index++) {
                var geometry = geometries[index];

                if (geometry.isReady()) {
                    serializeGeometry(geometry, serializationObject.geometries);
                }
            }

            // Meshes
            serializationObject.meshes = [];
            for (index = 0; index < scene.meshes.length; index++) {
                var abstractMesh = scene.meshes[index];

                if (abstractMesh instanceof Mesh) {
                    var mesh = abstractMesh;
                    if (!mesh.doNotSerialize) {
                        if (mesh.delayLoadState === Engine.DELAYLOADSTATE_LOADED || mesh.delayLoadState === Engine.DELAYLOADSTATE_NONE) {
                            serializationObject.meshes.push(serializeMesh(mesh, serializationObject));
                        }
                    }
                }
            }

            // Particles Systems
            serializationObject.particleSystems = [];
            for (index = 0; index < scene.particleSystems.length; index++) {
                serializationObject.particleSystems.push(scene.particleSystems[index].serialize());
            }

            // Lens flares
            serializationObject.lensFlareSystems = [];
            for (index = 0; index < scene.lensFlareSystems.length; index++) {
                serializationObject.lensFlareSystems.push(scene.lensFlareSystems[index].serialize());
            }

            // Shadows
            serializationObject.shadowGenerators = [];
            for (index = 0; index < scene.lights.length; index++) {
                light = scene.lights[index];

                let shadowGenerator = light.getShadowGenerator();
                if (shadowGenerator) {
                     serializationObject.shadowGenerators.push(shadowGenerator.serialize());
                }
            }

            // Action Manager
            if (scene.actionManager) {
                serializationObject.actions = scene.actionManager.serialize("scene");
            }

            // Audio
            serializationObject.sounds = [];

            for (index = 0; index < scene.soundTracks.length; index++) {
                var soundtrack = scene.soundTracks[index];

                for (var soundId = 0; soundId < soundtrack.soundCollection.length; soundId++) {
                    serializationObject.sounds.push(soundtrack.soundCollection[soundId].serialize());
                }
            }

            return serializationObject;
        }

        public static SerializeMesh(toSerialize: any /* Mesh || Mesh[] */, withParents: boolean = false, withChildren: boolean = false): any {
            var serializationObject: any = {};

            SceneSerializer.ClearCache();

            toSerialize = (toSerialize instanceof Array) ? toSerialize : [toSerialize];

            if (withParents || withChildren) {
                //deliberate for loop! not for each, appended should be processed as well.
                for (var i = 0; i < toSerialize.length; ++i) {
                    if (withChildren) {
                        toSerialize[i].getDescendants().forEach((node) => {
                            if (node instanceof Mesh && (toSerialize.indexOf(node) < 0)) {
                                toSerialize.push(node);
                            }
                        });
                    }
                    //make sure the array doesn't contain the object already
                    if (withParents && toSerialize[i].parent && (toSerialize.indexOf(toSerialize[i].parent) < 0)) {
                        toSerialize.push(toSerialize[i].parent);
                    }
                }
            }

            toSerialize.forEach((mesh: Mesh) => {
                finalizeSingleMesh(mesh, serializationObject);
            });

            return serializationObject;
        }
    }
}