/**
 * @author mrdoob / http://mrdoob.com/
 */

var Loader = function (editor) {

    var scope = this;
    var signals = editor.signals;

    this.texturePath = '';

    this.loadFile = function (file) {

        var filename = file.name;
        var extension = filename.split('.').pop().toLowerCase();

        var reader = new FileReader();
        reader.addEventListener('progress', function (event) {

            var size = '(' + Math.floor(event.total / 1000).format() + ' KB)';
            var progress = Math.floor((event.loaded / event.total) * 100) + '%';
            console.log('加载中', filename, size, progress);

        });

        switch (extension) {

            case 'amf':

                reader.addEventListener('load', function (event) {

                    var loader = new THREE.AMFLoader();
                    var amfobject = loader.parse(event.target.result);

                    editor.execute(new AddObjectCommand(amfobject));

                }, false);
                reader.readAsArrayBuffer(file);

                break;

            case 'awd':

                reader.addEventListener('load', function (event) {

                    var loader = new THREE.AWDLoader();
                    var scene = loader.parse(event.target.result);

                    editor.execute(new SetSceneCommand(scene));

                }, false);
                reader.readAsArrayBuffer(file);

                break;

            case 'babylon':

                reader.addEventListener('load', function (event) {

                    var contents = event.target.result;
                    var json = JSON.parse(contents);

                    var loader = new THREE.BabylonLoader();
                    var scene = loader.parse(json);

                    editor.execute(new SetSceneCommand(scene));

                }, false);
                reader.readAsText(file);

                break;

            case 'babylonmeshdata':

                reader.addEventListener('load', function (event) {

                    var contents = event.target.result;
                    var json = JSON.parse(contents);

                    var loader = new THREE.BabylonLoader();

                    var geometry = loader.parseGeometry(json);
                    var material = new THREE.MeshStandardMaterial();

                    var mesh = new THREE.Mesh(geometry, material);
                    mesh.name = filename;

                    editor.execute(new AddObjectCommand(mesh));

                }, false);
                reader.readAsText(file);

                break;

            case 'ctm':

                reader.addEventListener('load', function (event) {

                    var data = new Uint8Array(event.target.result);

                    var stream = new CTM.Stream(data);
                    stream.offset = 0;

                    var loader = new THREE.CTMLoader();
                    loader.createModel(new CTM.File(stream), function (geometry) {

                        geometry.sourceType = "ctm";
                        geometry.sourceFile = file.name;

                        var material = new THREE.MeshStandardMaterial();

                        var mesh = new THREE.Mesh(geometry, material);
                        mesh.name = filename;

                        editor.execute(new AddObjectCommand(mesh));

                    });

                }, false);
                reader.readAsArrayBuffer(file);

                break;

            case 'dae':

                reader.addEventListener('load', function (event) {

                    var contents = event.target.result;

                    var loader = new THREE.ColladaLoader();
                    var collada = loader.parse(contents);

                    collada.scene.name = filename;

                    editor.execute(new AddObjectCommand(collada.scene));

                }, false);
                reader.readAsText(file);

                break;

            case 'fbx':

                reader.addEventListener('load', function (event) {

                    var contents = event.target.result;

                    var loader = new THREE.FBXLoader();
                    var object = loader.parse(contents);

                    editor.execute(new AddObjectCommand(object));

                }, false);
                reader.readAsText(file);

                break;

            case 'glb':
            case 'gltf':

                reader.addEventListener('load', function (event) {

                    var contents = event.target.result;

                    var loader = new THREE.GLTFLoader();
                    loader.parse(contents, function (result) {

                        result.scene.name = filename;
                        editor.execute(new AddObjectCommand(result.scene));

                    });

                }, false);
                reader.readAsArrayBuffer(file);

                break;

            case 'js':
            case 'json':

            case '3geo':
            case '3mat':
            case '3obj':
            case '3scn':

                reader.addEventListener('load', function (event) {

                    var contents = event.target.result;

                    // 2.0

                    if (contents.indexOf('postMessage') !== -1) {

                        var blob = new Blob([contents], { type: 'text/javascript' });
                        var url = URL.createObjectURL(blob);

                        var worker = new Worker(url);

                        worker.onmessage = function (event) {

                            event.data.metadata = { version: 2 };
                            handleJSON(event.data, file, filename);

                        };

                        worker.postMessage(Date.now());

                        return;

                    }

                    // >= 3.0

                    var data;

                    try {

                        data = JSON.parse(contents);

                    } catch (error) {

                        alert(error);
                        return;

                    }

                    handleJSON(data, file, filename);

                }, false);
                reader.readAsText(file);

                break;


            case 'kmz':

                reader.addEventListener('load', function (event) {

                    var loader = new THREE.KMZLoader();
                    var collada = loader.parse(event.target.result);

                    collada.scene.name = filename;

                    editor.execute(new AddObjectCommand(collada.scene));

                }, false);
                reader.readAsArrayBuffer(file);

                break;

            case 'md2':

                reader.addEventListener('load', function (event) {

                    var contents = event.target.result;

                    var geometry = new THREE.MD2Loader().parse(contents);
                    var material = new THREE.MeshStandardMaterial({
                        morphTargets: true,
                        morphNormals: true
                    });

                    var mesh = new THREE.Mesh(geometry, material);
                    mesh.mixer = new THREE.AnimationMixer(mesh);
                    mesh.name = filename;

                    editor.execute(new AddObjectCommand(mesh));

                }, false);
                reader.readAsArrayBuffer(file);

                break;

            case 'obj':

                reader.addEventListener('load', function (event) {

                    var contents = event.target.result;

                    var object = new THREE.OBJLoader().parse(contents);
                    object.name = filename;

                    editor.execute(new AddObjectCommand(object));

                }, false);
                reader.readAsText(file);

                break;

            case 'playcanvas':

                reader.addEventListener('load', function (event) {

                    var contents = event.target.result;
                    var json = JSON.parse(contents);

                    var loader = new THREE.PlayCanvasLoader();
                    var object = loader.parse(json);

                    editor.execute(new AddObjectCommand(object));

                }, false);
                reader.readAsText(file);

                break;

            case 'ply':

                reader.addEventListener('load', function (event) {

                    var contents = event.target.result;

                    var geometry = new THREE.PLYLoader().parse(contents);
                    geometry.sourceType = "ply";
                    geometry.sourceFile = file.name;

                    var material = new THREE.MeshStandardMaterial();

                    var mesh = new THREE.Mesh(geometry, material);
                    mesh.name = filename;

                    editor.execute(new AddObjectCommand(mesh));

                }, false);
                reader.readAsArrayBuffer(file);

                break;

            case 'stl':

                reader.addEventListener('load', function (event) {

                    var contents = event.target.result;

                    var geometry = new THREE.STLLoader().parse(contents);
                    geometry.sourceType = "stl";
                    geometry.sourceFile = file.name;

                    var material = new THREE.MeshStandardMaterial();

                    var mesh = new THREE.Mesh(geometry, material);
                    mesh.name = filename;

                    editor.execute(new AddObjectCommand(mesh));

                }, false);

                if (reader.readAsBinaryString !== undefined) {

                    reader.readAsBinaryString(file);

                } else {

                    reader.readAsArrayBuffer(file);

                }

                break;

                /*
                case 'utf8':
    
                    reader.addEventListener( 'load', function ( event ) {
    
                        var contents = event.target.result;
    
                        var geometry = new THREE.UTF8Loader().parse( contents );
                        var material = new THREE.MeshLambertMaterial();
    
                        var mesh = new THREE.Mesh( geometry, material );
    
                        editor.execute( new AddObjectCommand( mesh ) );
    
                    }, false );
                    reader.readAsBinaryString( file );
    
                    break;
                */

            case 'vtk':

                reader.addEventListener('load', function (event) {

                    var contents = event.target.result;

                    var geometry = new THREE.VTKLoader().parse(contents);
                    geometry.sourceType = "vtk";
                    geometry.sourceFile = file.name;

                    var material = new THREE.MeshStandardMaterial();

                    var mesh = new THREE.Mesh(geometry, material);
                    mesh.name = filename;

                    editor.execute(new AddObjectCommand(mesh));

                }, false);
                reader.readAsText(file);

                break;

            case 'wrl':

                reader.addEventListener('load', function (event) {

                    var contents = event.target.result;

                    var result = new THREE.VRMLLoader().parse(contents);

                    editor.execute(new SetSceneCommand(result));

                }, false);
                reader.readAsText(file);

                break;

            default:

                alert('不支持的文件类型(' + extension + ').');

                break;

        }

    };

    function handleJSON(data, file, filename) {

        if (data.metadata === undefined) { // 2.0

            data.metadata = { type: 'Geometry' };

        }

        if (data.metadata.type === undefined) { // 3.0

            data.metadata.type = 'Geometry';

        }

        if (data.metadata.formatVersion !== undefined) {

            data.metadata.version = data.metadata.formatVersion;

        }

        switch (data.metadata.type.toLowerCase()) {

            case 'buffergeometry':

                var loader = new THREE.BufferGeometryLoader();
                var result = loader.parse(data);

                var mesh = new THREE.Mesh(result);

                editor.execute(new AddObjectCommand(mesh));

                break;

            case 'geometry':

                var loader = new THREE.JSONLoader();
                loader.setTexturePath(scope.texturePath);

                var result = loader.parse(data);

                var geometry = result.geometry;
                var material;

                if (result.materials !== undefined) {

                    if (result.materials.length > 1) {

                        material = new THREE.MultiMaterial(result.materials);

                    } else {

                        material = result.materials[0];

                    }

                } else {

                    material = new THREE.MeshStandardMaterial();

                }

                geometry.sourceType = "ascii";
                geometry.sourceFile = file.name;

                var mesh;

                if (geometry.animation && geometry.animation.hierarchy) {

                    mesh = new THREE.SkinnedMesh(geometry, material);

                } else {

                    mesh = new THREE.Mesh(geometry, material);

                }

                mesh.name = filename;

                editor.execute(new AddObjectCommand(mesh));

                break;

            case 'object':

                var loader = new THREE.ObjectLoader();
                loader.setTexturePath(scope.texturePath);

                var result = loader.parse(data);

                if (result instanceof THREE.Scene) {

                    editor.execute(new SetSceneCommand(result));

                } else {

                    editor.execute(new AddObjectCommand(result));

                }

                break;

            case 'scene':

                // DEPRECATED

                var loader = new THREE.SceneLoader();
                loader.parse(data, function (result) {

                    editor.execute(new SetSceneCommand(result.scene));

                }, '');

                break;

            case 'app':

                editor.fromJSON(data);

                break;

        }

    }

};