module BABYLON.Internals {

    var parseMaterialById = (id, parsedData, scene, rootUrl) => {
        for (var index = 0, cache = parsedData.materials.length; index < cache; index++) {
            var parsedMaterial = parsedData.materials[index];
            if (parsedMaterial.id === id) {
                return Material.Parse(parsedMaterial, scene, rootUrl);
            }
        }
        return null;
    };

    var isDescendantOf = (mesh, names, hierarchyIds) => {
        names = (names instanceof Array) ? names : [names];
        for (var i in names) {
            if (mesh.name === names[i]) {
                hierarchyIds.push(mesh.id);
                return true;
            }
        }
        if (mesh.parentId && hierarchyIds.indexOf(mesh.parentId) !== -1) {
            hierarchyIds.push(mesh.id);
            return true;
        }
        return false;
    };

    var logOperation = (operation, producer) => {
        return operation + " of " + (producer ? producer.file + " from " + producer.name + " version: " + producer.version + ", exporter version: " + producer.exporter_version : "unknown");
    }

    SceneLoader.RegisterPlugin({
        extensions: ".babylon",
        importMesh: (meshesNames: any, scene: Scene, data: any, rootUrl: string, meshes: AbstractMesh[], particleSystems: ParticleSystem[], skeletons: Skeleton[]): boolean => {
            // Entire method running in try block, so ALWAYS logs as far as it got, only actually writes details
            // when SceneLoader.debugLogging = true (default), or exception encountered.
            // Everything stored in var log instead of writing separate lines to support only writing in exception,
            // and avoid problems with multiple concurrent .babylon loads.
            var log = "importMesh has failed JSON parse";
            try {
                var parsedData = JSON.parse(data);
                log = "";
                var fullDetails = SceneLoader.loggingLevel === SceneLoader.DETAILED_LOGGING;

                var loadedSkeletonsIds = [];
                var loadedMaterialsIds = [];
                var hierarchyIds = [];
                var index: number;
                var cache: number;
                for (index = 0, cache = parsedData.meshes.length; index < cache; index++) {
                    var parsedMesh = parsedData.meshes[index];

                    if (!meshesNames || isDescendantOf(parsedMesh, meshesNames, hierarchyIds)) {
                        if (meshesNames instanceof Array) {
                            // Remove found mesh name from list.
                            delete meshesNames[meshesNames.indexOf(parsedMesh.name)];
                        }
    
                        //Geometry?
                        if (parsedMesh.geometryId) {
                            //does the file contain geometries?
                            if (parsedData.geometries) {
                                //find the correct geometry and add it to the scene
                                var found: boolean = false;
                                ["boxes", "spheres", "cylinders", "toruses", "grounds", "planes", "torusKnots", "vertexData"].forEach((geometryType: string) => {
                                    if (found || !parsedData.geometries[geometryType] || !(parsedData.geometries[geometryType] instanceof Array)) {
                                        return;
                                    } else {
                                        parsedData.geometries[geometryType].forEach((parsedGeometryData) => {
                                            if (parsedGeometryData.id === parsedMesh.geometryId) {
                                                switch (geometryType) {
                                                    case "boxes":
                                                        Geometry.Primitives.Box.Parse(parsedGeometryData, scene);
                                                        break;
                                                    case "spheres":
                                                        Geometry.Primitives.Sphere.Parse(parsedGeometryData, scene);
                                                        break;
                                                    case "cylinders":
                                                        Geometry.Primitives.Cylinder.Parse(parsedGeometryData, scene);
                                                        break;
                                                    case "toruses":
                                                        Geometry.Primitives.Torus.Parse(parsedGeometryData, scene);
                                                        break;
                                                    case "grounds":
                                                        Geometry.Primitives.Ground.Parse(parsedGeometryData, scene);
                                                        break;
                                                    case "planes":
                                                        Geometry.Primitives.Plane.Parse(parsedGeometryData, scene);
                                                        break;
                                                    case "torusKnots":
                                                        Geometry.Primitives.TorusKnot.Parse(parsedGeometryData, scene);
                                                        break;
                                                    case "vertexData":
                                                        Geometry.Parse(parsedGeometryData, scene, rootUrl);
                                                        break;
                                                }
                                                found = true;
                                            }
                                        });

                                    }
                                });
                                if (!found) {
                                    Tools.Warn("Geometry not found for mesh " + parsedMesh.id);
                                }
                            }
                        }
    
                        // Material ?
                        if (parsedMesh.materialId) {
                            var materialFound = (loadedMaterialsIds.indexOf(parsedMesh.materialId) !== -1);
                            if (!materialFound && parsedData.multiMaterials) {
                                for (var multimatIndex = 0, multimatCache = parsedData.multiMaterials.length; multimatIndex < multimatCache; multimatIndex++) {
                                    var parsedMultiMaterial = parsedData.multiMaterials[multimatIndex];
                                    if (parsedMultiMaterial.id === parsedMesh.materialId) {
                                        for (var matIndex = 0, matCache = parsedMultiMaterial.materials.length; matIndex < matCache; matIndex++) {
                                            var subMatId = parsedMultiMaterial.materials[matIndex];
                                            loadedMaterialsIds.push(subMatId);
                                            var mat = parseMaterialById(subMatId, parsedData, scene, rootUrl);
                                            log += "\n\tMaterial " + mat.toString(fullDetails);
                                        }
                                        loadedMaterialsIds.push(parsedMultiMaterial.id);
                                        var mmat = Material.ParseMultiMaterial(parsedMultiMaterial, scene);
                                        materialFound = true;
                                        log += "\n\tMulti-Material " + mmat.toString(fullDetails);
                                        break;
                                    }
                                }
                            }

                            if (!materialFound) {
                                loadedMaterialsIds.push(parsedMesh.materialId);
                                var mat = parseMaterialById(parsedMesh.materialId, parsedData, scene, rootUrl);
                                if (!mat) {
                                    Tools.Warn("Material not found for mesh " + parsedMesh.id);
                                } else {
                                    log += "\n\tMaterial " + mat.toString(fullDetails);
                                }
                            }
                        }
    
                        // Skeleton ?
                        if (parsedMesh.skeletonId > -1 && scene.skeletons) {
                            var skeletonAlreadyLoaded = (loadedSkeletonsIds.indexOf(parsedMesh.skeletonId) > -1);
                            if (!skeletonAlreadyLoaded) {
                                for (var skeletonIndex = 0, skeletonCache = parsedData.skeletons.length; skeletonIndex < skeletonCache; skeletonIndex++) {
                                    var parsedSkeleton = parsedData.skeletons[skeletonIndex];
                                    if (parsedSkeleton.id === parsedMesh.skeletonId) {
                                        var skeleton = Skeleton.Parse(parsedSkeleton, scene);
                                        skeletons.push(skeleton);
                                        loadedSkeletonsIds.push(parsedSkeleton.id);
                                        log += "\n\tSkeleton " + skeleton.toString(fullDetails);
                                    }
                                }
                            }
                        }

                        var mesh = Mesh.Parse(parsedMesh, scene, rootUrl);
                        meshes.push(mesh);
                        log += "\n\tMesh " + mesh.toString(fullDetails);
                    }
                }
    
                // Connecting parents
                var currentMesh: AbstractMesh;
                for (index = 0, cache = scene.meshes.length; index < cache; index++) {
                    currentMesh = scene.meshes[index];
                    if (currentMesh._waitingParentId) {
                        currentMesh.parent = scene.getLastEntryByID(currentMesh._waitingParentId);
                        currentMesh._waitingParentId = undefined;
                    }
                }
    
                // freeze and compute world matrix application
                for (index = 0, cache = scene.meshes.length; index < cache; index++) {
                    currentMesh = scene.meshes[index];
                    if (currentMesh._waitingFreezeWorldMatrix) {
                        currentMesh.freezeWorldMatrix();
                        currentMesh._waitingFreezeWorldMatrix = undefined;
                    } else {
                        currentMesh.computeWorldMatrix(true);
                    }
                }
    
                // Particles
                if (parsedData.particleSystems) {
                    for (index = 0, cache = parsedData.particleSystems.length; index < cache; index++) {
                        var parsedParticleSystem = parsedData.particleSystems[index];
                        if (hierarchyIds.indexOf(parsedParticleSystem.emitterId) !== -1) {
                            particleSystems.push(ParticleSystem.Parse(parsedParticleSystem, scene, rootUrl));
                        }
                    }
                }

                return true;

            } catch (err) {
                Tools.Log(logOperation("importMesh", parsedData ? parsedData.producer : "Unknown") + log);
                log = null;
                throw err;

            } finally {
                if (log !== null && SceneLoader.loggingLevel !== SceneLoader.NO_LOGGING) {
                    Tools.Log(logOperation("importMesh", parsedData ? parsedData.producer : "Unknown") + (SceneLoader.loggingLevel !== SceneLoader.MINIMAL_LOGGING ? log : ""));
                }
            }
        },
        load: (scene: Scene, data: string, rootUrl: string): boolean => {
            // Entire method running in try block, so ALWAYS logs as far as it got, only actually writes details
            // when SceneLoader.debugLogging = true (default), or exception encountered.
            // Everything stored in var log instead of writing separate lines to support only writing in exception,
            // and avoid problems with multiple concurrent .babylon loads.
            var log = "importScene has failed JSON parse";
            try {
                var parsedData = JSON.parse(data);
                log = "";
                var fullDetails = SceneLoader.loggingLevel === SceneLoader.DETAILED_LOGGING;
                
                // Scene
                scene.useDelayedTextureLoading = parsedData.useDelayedTextureLoading && !BABYLON.SceneLoader.ForceFullSceneLoadingForIncremental;
                scene.autoClear = parsedData.autoClear;
                scene.clearColor = BABYLON.Color4.FromArray(parsedData.clearColor);
                scene.ambientColor = BABYLON.Color3.FromArray(parsedData.ambientColor);
                if (parsedData.gravity) {
                    scene.gravity = BABYLON.Vector3.FromArray(parsedData.gravity);
                }
                
                // Fog
                if (parsedData.fogMode && parsedData.fogMode !== 0) {
                    scene.fogMode = parsedData.fogMode;
                    scene.fogColor = BABYLON.Color3.FromArray(parsedData.fogColor);
                    scene.fogStart = parsedData.fogStart;
                    scene.fogEnd = parsedData.fogEnd;
                    scene.fogDensity = parsedData.fogDensity;
                    log += "\tFog mode for scene:  ";
                    switch (scene.fogMode) {
                        // getters not compiling, so using hardcoded
                        case 1: log += "exp\n"; break;
                        case 2: log += "exp2\n"; break;
                        case 3: log += "linear\n"; break;
                    }
                }
                
                //Physics
                if (parsedData.physicsEnabled) {
                    var physicsPlugin;
                    if (parsedData.physicsEngine === "cannon") {
                        physicsPlugin = new BABYLON.CannonJSPlugin();
                    } else if (parsedData.physicsEngine === "oimo") {
                        physicsPlugin = new BABYLON.OimoJSPlugin();
                    }
                    log = "\tPhysics engine " + (parsedData.physicsEngine ? parsedData.physicsEngine : "oimo") + " enabled\n";
                    //else - default engine, which is currently oimo
                    var physicsGravity = parsedData.physicsGravity ? BABYLON.Vector3.FromArray(parsedData.physicsGravity) : null;
                    scene.enablePhysics(physicsGravity, physicsPlugin);
                }
                
                // Metadata
                if (parsedData.metadata !== undefined) {
                    scene.metadata = parsedData.metadata;
                }
                
                //collisions, if defined. otherwise, default is true
                if (parsedData.collisionsEnabled != undefined) {
                    scene.collisionsEnabled = parsedData.collisionsEnabled;
                }
                scene.workerCollisions = !!parsedData.workerCollisions;

                var index: number;
                var cache: number;
                // Lights
                for (index = 0, cache = parsedData.lights.length; index < cache; index++) {
                    var parsedLight = parsedData.lights[index];
                    var light = Light.Parse(parsedLight, scene);
                    log += (index === 0 ? "\n\tLights:" : "");
                    log += "\n\t\t" + light.toString(fullDetails);
                }
    
                // Animations
                if (parsedData.animations) {
                    for (index = 0, cache = parsedData.animations.length; index < cache; index++) {
                        var parsedAnimation = parsedData.animations[index];
                        var animation = Animation.Parse(parsedAnimation);
                        scene.animations.push(animation);
                        log += (index === 0 ? "\n\tAnimations:" : "");
                        log += "\n\t\t" + animation.toString(fullDetails);
                    }
                }

                if (parsedData.autoAnimate) {
                    scene.beginAnimation(scene, parsedData.autoAnimateFrom, parsedData.autoAnimateTo, parsedData.autoAnimateLoop, parsedData.autoAnimateSpeed || 1.0);
                }
    
                // Materials
                if (parsedData.materials) {
                    for (index = 0, cache = parsedData.materials.length; index < cache; index++) {
                        var parsedMaterial = parsedData.materials[index];
                        var mat = Material.Parse(parsedMaterial, scene, rootUrl);
                        log += (index === 0 ? "\n\tMaterials:" : "");
                        log += "\n\t\t" + mat.toString(fullDetails);
                    }
                }

                if (parsedData.multiMaterials) {
                    for (index = 0, cache = parsedData.multiMaterials.length; index < cache; index++) {
                        var parsedMultiMaterial = parsedData.multiMaterials[index];
                        var mmat = Material.ParseMultiMaterial(parsedMultiMaterial, scene);
                        log += (index === 0 ? "\n\tMultiMaterials:" : "");
                        log += "\n\t\t" + mmat.toString(fullDetails);
                    }
                }

                // Morph targets
                if (parsedData.morphTargetManagers) {
                    for (var managerData of parsedData.morphTargetManagers) {
                        var parsedManager = MorphTargetManager.Parse(managerData, scene);
                    }
                }
    
                // Skeletons
                if (parsedData.skeletons) {
                    for (index = 0, cache = parsedData.skeletons.length; index < cache; index++) {
                        var parsedSkeleton = parsedData.skeletons[index];
                        var skeleton = Skeleton.Parse(parsedSkeleton, scene);
                        log += (index === 0 ? "\n\tSkeletons:" : "");
                        log += "\n\t\t" + skeleton.toString(fullDetails);
                    }
                }
    
                // Geometries
                var geometries = parsedData.geometries;
                if (geometries) {
                    // Boxes
                    var boxes = geometries.boxes;
                    if (boxes) {
                        for (index = 0, cache = boxes.length; index < cache; index++) {
                            var parsedBox = boxes[index];
                            Geometry.Primitives.Box.Parse(parsedBox, scene);
                        }
                    }
    
                    // Spheres
                    var spheres = geometries.spheres;
                    if (spheres) {
                        for (index = 0, cache = spheres.length; index < cache; index++) {
                            var parsedSphere = spheres[index];
                            Geometry.Primitives.Sphere.Parse(parsedSphere, scene);
                        }
                    }
    
                    // Cylinders
                    var cylinders = geometries.cylinders;
                    if (cylinders) {
                        for (index = 0, cache = cylinders.length; index < cache; index++) {
                            var parsedCylinder = cylinders[index];
                            Geometry.Primitives.Cylinder.Parse(parsedCylinder, scene);
                        }
                    }
    
                    // Toruses
                    var toruses = geometries.toruses;
                    if (toruses) {
                        for (index = 0, cache = toruses.length; index < cache; index++) {
                            var parsedTorus = toruses[index];
                            Geometry.Primitives.Torus.Parse(parsedTorus, scene);
                        }
                    }
    
                    // Grounds
                    var grounds = geometries.grounds;
                    if (grounds) {
                        for (index = 0, cache = grounds.length; index < cache; index++) {
                            var parsedGround = grounds[index];
                            Geometry.Primitives.Ground.Parse(parsedGround, scene);
                        }
                    }
    
                    // Planes
                    var planes = geometries.planes;
                    if (planes) {
                        for (index = 0, cache = planes.length; index < cache; index++) {
                            var parsedPlane = planes[index];
                            Geometry.Primitives.Plane.Parse(parsedPlane, scene);
                        }
                    }
    
                    // TorusKnots
                    var torusKnots = geometries.torusKnots;
                    if (torusKnots) {
                        for (index = 0, cache = torusKnots.length; index < cache; index++) {
                            var parsedTorusKnot = torusKnots[index];
                            Geometry.Primitives.TorusKnot.Parse(parsedTorusKnot, scene);
                        }
                    }
    
                    // VertexData
                    var vertexData = geometries.vertexData;
                    if (vertexData) {
                        for (index = 0, cache = vertexData.length; index < cache; index++) {
                            var parsedVertexData = vertexData[index];
                            Geometry.Parse(parsedVertexData, scene, rootUrl);
                        }
                    }
                }
    
                // Meshes
                for (index = 0, cache = parsedData.meshes.length; index < cache; index++) {
                    var parsedMesh = parsedData.meshes[index];
                    var mesh = <AbstractMesh>Mesh.Parse(parsedMesh, scene, rootUrl);
                    log += (index === 0 ? "\n\tMeshes:" : "");
                    log += "\n\t\t" + mesh.toString(fullDetails);
                }
    
                // Cameras
                for (index = 0, cache = parsedData.cameras.length; index < cache; index++) {
                    var parsedCamera = parsedData.cameras[index];
                    var camera = Camera.Parse(parsedCamera, scene);
                    log += (index === 0 ? "\n\tCameras:" : "");
                    log += "\n\t\t" + camera.toString(fullDetails);
                }
                if (parsedData.activeCameraID) {
                    scene.setActiveCameraByID(parsedData.activeCameraID);
                }
    
                // Browsing all the graph to connect the dots
                for (index = 0, cache = scene.cameras.length; index < cache; index++) {
                    var camera = scene.cameras[index];
                    if (camera._waitingParentId) {
                        camera.parent = scene.getLastEntryByID(camera._waitingParentId);
                        camera._waitingParentId = undefined;
                    }
                }

                for (index = 0, cache = scene.lights.length; index < cache; index++) {
                    var light = scene.lights[index];
                    if (light._waitingParentId) {
                        light.parent = scene.getLastEntryByID(light._waitingParentId);
                        light._waitingParentId = undefined;
                    }
                }
    
                // Sounds
                var loadedSounds: Sound[] = [];
                var loadedSound: Sound;
                if (AudioEngine && parsedData.sounds) {
                    for (index = 0, cache = parsedData.sounds.length; index < cache; index++) {
                        var parsedSound = parsedData.sounds[index];
                        if (Engine.audioEngine.canUseWebAudio) {
                            if (!parsedSound.url) parsedSound.url = parsedSound.name;
                            if (!loadedSounds[parsedSound.url]) {
                                loadedSound = Sound.Parse(parsedSound, scene, rootUrl);
                                loadedSounds[parsedSound.url] = loadedSound;
                            }
                            else {
                                Sound.Parse(parsedSound, scene, rootUrl, loadedSounds[parsedSound.url]);
                            }
                        } else {
                            var emptySound = new Sound(parsedSound.name, null, scene);
                        }
                    }
                }

                loadedSounds = [];
    
                // Connect parents & children and parse actions
                for (index = 0, cache = scene.meshes.length; index < cache; index++) {
                    var mesh = scene.meshes[index];
                    if (mesh._waitingParentId) {
                        mesh.parent = scene.getLastEntryByID(mesh._waitingParentId);
                        mesh._waitingParentId = undefined;
                    }
                    if (mesh._waitingActions) {
                        ActionManager.Parse(mesh._waitingActions, mesh, scene);
                        mesh._waitingActions = undefined;
                    }
                }
    
                // freeze world matrix application
                for (index = 0, cache = scene.meshes.length; index < cache; index++) {
                    var currentMesh = scene.meshes[index];
                    if (currentMesh._waitingFreezeWorldMatrix) {
                        currentMesh.freezeWorldMatrix();
                        currentMesh._waitingFreezeWorldMatrix = undefined;
                    } else {
                        currentMesh.computeWorldMatrix(true);
                    }
                }
    
                // Particles Systems
                if (parsedData.particleSystems) {
                    for (index = 0, cache = parsedData.particleSystems.length; index < cache; index++) {
                        var parsedParticleSystem = parsedData.particleSystems[index];
                        ParticleSystem.Parse(parsedParticleSystem, scene, rootUrl);
                    }
                }
    
                // Lens flares
                if (parsedData.lensFlareSystems) {
                    for (index = 0, cache = parsedData.lensFlareSystems.length; index < cache; index++) {
                        var parsedLensFlareSystem = parsedData.lensFlareSystems[index];
                        LensFlareSystem.Parse(parsedLensFlareSystem, scene, rootUrl);
                    }
                }
    
                // Shadows
                if (parsedData.shadowGenerators) {
                    for (index = 0, cache = parsedData.shadowGenerators.length; index < cache; index++) {
                        var parsedShadowGenerator = parsedData.shadowGenerators[index];
                        ShadowGenerator.Parse(parsedShadowGenerator, scene);
                    }
                }
                
                // Lights exclusions / inclusions
                for (index = 0, cache = scene.lights.length; index < cache; index++) {
                    var light = scene.lights[index];
                    // Excluded check
                    if (light._excludedMeshesIds.length > 0) {
                        for (var excludedIndex = 0; excludedIndex < light._excludedMeshesIds.length; excludedIndex++) {
                            var excludedMesh = scene.getMeshByID(light._excludedMeshesIds[excludedIndex]);

                            if (excludedMesh) {
                                light.excludedMeshes.push(excludedMesh);
                            }
                        }

                        light._excludedMeshesIds = [];
                    }

                    // Included check
                    if (light._includedOnlyMeshesIds.length > 0) {
                        for (var includedOnlyIndex = 0; includedOnlyIndex < light._includedOnlyMeshesIds.length; includedOnlyIndex++) {
                            var includedOnlyMesh = scene.getMeshByID(light._includedOnlyMeshesIds[includedOnlyIndex]);

                            if (includedOnlyMesh) {
                                light.includedOnlyMeshes.push(includedOnlyMesh);
                            }
                        }

                        light._includedOnlyMeshesIds = [];
                    }
                }
    
                // Actions (scene)
                if (parsedData.actions) {
                    ActionManager.Parse(parsedData.actions, null, scene);
                }
    
                // Finish
                return true;

            } catch (err) {
                Tools.Log(logOperation("importScene", parsedData ? parsedData.producer : "Unknown") + log);
                log = null;
                throw err;

            } finally {
                if (log !== null && SceneLoader.loggingLevel !== SceneLoader.NO_LOGGING) {
                    Tools.Log(logOperation("importScene", parsedData ? parsedData.producer : "Unknown") + (SceneLoader.loggingLevel !== SceneLoader.MINIMAL_LOGGING ? log : ""));
                }
            }
        }
    });
}