var THREE = require('three')

/**
 * Loads a Wavefront .mtl file specifying materials
 *
 * @author angelxuanchang
 */

THREE.MTLLoader = function ( manager ) {

	this.manager = ( manager !== undefined ) ? manager : THREE.DefaultLoadingManager;

};

THREE.MTLLoader.prototype = {

	constructor: THREE.MTLLoader,

	/**
	 * Loads and parses a MTL asset from a URL.
	 *
	 * @param {String} url - URL to the MTL file.
	 * @param {Function} [onLoad] - Callback invoked with the loaded object.
	 * @param {Function} [onProgress] - Callback for download progress.
	 * @param {Function} [onError] - Callback for download errors.
	 *
	 * @see setPath setTexturePath
	 *
	 * @note In order for relative texture references to resolve correctly
	 * you must call setPath and/or setTexturePath explicitly prior to load.
	 */
	load: function ( url, onLoad, onProgress, onError ) {

		var scope = this;

		var loader = new THREE.FileLoader( this.manager );
		loader.setPath( this.path );
		loader.load( url, function ( text ) {

			onLoad( scope.parse( text ) );

		}, onProgress, onError );

	},

	/**
	 * Set base path for resolving references.
	 * If set this path will be prepended to each loaded and found reference.
	 *
	 * @see setTexturePath
	 * @param {String} path
	 * @return {THREE.MTLLoader}
	 *
	 * @example
	 *     mtlLoader.setPath( 'assets/obj/' );
	 *     mtlLoader.load( 'my.mtl', ... );
	 */
	setPath: function ( path ) {

		this.path = path;
		return this;

	},

	/**
	 * Set base path for resolving texture references.
	 * If set this path will be prepended found texture reference.
	 * If not set and setPath is, it will be used as texture base path.
	 *
	 * @see setPath
	 * @param {String} path
	 * @return {THREE.MTLLoader}
	 *
	 * @example
	 *     mtlLoader.setPath( 'assets/obj/' );
	 *     mtlLoader.setTexturePath( 'assets/textures/' );
	 *     mtlLoader.load( 'my.mtl', ... );
	 */
	setTexturePath: function ( path ) {

		this.texturePath = path;
		return this;

	},

	setBaseUrl: function ( path ) {

		console.warn( 'THREE.MTLLoader: .setBaseUrl() is deprecated. Use .setTexturePath( path ) for texture path or .setPath( path ) for general base path instead.' );

		return this.setTexturePath( path );

	},

	setCrossOrigin: function ( value ) {

		this.crossOrigin = value;
		return this;

	},

	setMaterialOptions: function ( value ) {

		this.materialOptions = value;
		return this;

	},

	/**
	 * Parses a MTL file.
	 *
	 * @param {String} text - Content of MTL file
	 * @return {THREE.MTLLoader.MaterialCreator}
	 *
	 * @see setPath setTexturePath
	 *
	 * @note In order for relative texture references to resolve correctly
	 * you must call setPath and/or setTexturePath explicitly prior to parse.
	 */
	parse: function ( text ) {

		var lines = text.split( '\n' );
		var info = {};
		var delimiter_pattern = /\s+/;
		var materialsInfo = {};

		for ( var i = 0; i < lines.length; i ++ ) {

			var line = lines[ i ];
			line = line.trim();

			if ( line.length === 0 || line.charAt( 0 ) === '#' ) {

				// Blank line or comment ignore
				continue;

			}

			var pos = line.indexOf( ' ' );

			var key = ( pos >= 0 ) ? line.substring( 0, pos ) : line;
			key = key.toLowerCase();

			var value = ( pos >= 0 ) ? line.substring( pos + 1 ) : '';
			value = value.trim();

			if ( key === 'newmtl' ) {

				// New material

				info = { name: value };
				materialsInfo[ value ] = info;

			} else if ( info ) {

				if ( key === 'ka' || key === 'kd' || key === 'ks' ) {

					var ss = value.split( delimiter_pattern, 3 );
					info[ key ] = [ parseFloat( ss[ 0 ] ), parseFloat( ss[ 1 ] ), parseFloat( ss[ 2 ] ) ];

				} else {

					info[ key ] = value;

				}

			}

		}

		var materialCreator = new THREE.MTLLoader.MaterialCreator( this.texturePath || this.path, this.materialOptions );
		materialCreator.setCrossOrigin( this.crossOrigin );
		materialCreator.setManager( this.manager );
		materialCreator.setMaterials( materialsInfo );
		return materialCreator;

	}

};

/**
 * Create a new THREE-MTLLoader.MaterialCreator
 * @param baseUrl - Url relative to which textures are loaded
 * @param options - Set of options on how to construct the materials
 *                  side: Which side to apply the material
 *                        THREE.FrontSide (default), THREE.BackSide, THREE.DoubleSide
 *                  wrap: What type of wrapping to apply for textures
 *                        THREE.RepeatWrapping (default), THREE.ClampToEdgeWrapping, THREE.MirroredRepeatWrapping
 *                  normalizeRGB: RGBs need to be normalized to 0-1 from 0-255
 *                                Default: false, assumed to be already normalized
 *                  ignoreZeroRGBs: Ignore values of RGBs (Ka,Kd,Ks) that are all 0's
 *                                  Default: false
 * @constructor
 */

THREE.MTLLoader.MaterialCreator = function ( baseUrl, options ) {

	this.baseUrl = baseUrl || '';
	this.options = options;
	this.materialsInfo = {};
	this.materials = {};
	this.materialsArray = [];
	this.nameLookup = {};

	this.side = ( this.options && this.options.side ) ? this.options.side : THREE.FrontSide;
	this.wrap = ( this.options && this.options.wrap ) ? this.options.wrap : THREE.RepeatWrapping;

};

THREE.MTLLoader.MaterialCreator.prototype = {

	constructor: THREE.MTLLoader.MaterialCreator,

	crossOrigin: 'Anonymous',

	setCrossOrigin: function ( value ) {

		this.crossOrigin = value;

	},

	setManager: function ( value ) {

		this.manager = value;

	},

	setMaterials: function ( materialsInfo ) {

		this.materialsInfo = this.convert( materialsInfo );
		this.materials = {};
		this.materialsArray = [];
		this.nameLookup = {};

	},

	convert: function ( materialsInfo ) {

		if ( ! this.options ) return materialsInfo;

		var converted = {};

		for ( var mn in materialsInfo ) {

			// Convert materials info into normalized form based on options

			var mat = materialsInfo[ mn ];

			var covmat = {};

			converted[ mn ] = covmat;

			for ( var prop in mat ) {

				var save = true;
				var value = mat[ prop ];
				var lprop = prop.toLowerCase();

				switch ( lprop ) {

					case 'kd':
					case 'ka':
					case 'ks':

						// Diffuse color (color under white light) using RGB values

						if ( this.options && this.options.normalizeRGB ) {

							value = [ value[ 0 ] / 255, value[ 1 ] / 255, value[ 2 ] / 255 ];

						}

						if ( this.options && this.options.ignoreZeroRGBs ) {

							if ( value[ 0 ] === 0 && value[ 1 ] === 0 && value[ 2 ] === 0 ) {

								// ignore

								save = false;

							}

						}

						break;

					default:

						break;

				}

				if ( save ) {

					covmat[ lprop ] = value;

				}

			}

		}

		return converted;

	},

	preload: function () {

		for ( var mn in this.materialsInfo ) {

			this.create( mn );

		}

	},

	getIndex: function ( materialName ) {

		return this.nameLookup[ materialName ];

	},

	getAsArray: function () {

		var index = 0;

		for ( var mn in this.materialsInfo ) {

			this.materialsArray[ index ] = this.create( mn );
			this.nameLookup[ mn ] = index;
			index ++;

		}

		return this.materialsArray;

	},

	create: function ( materialName ) {

		if ( this.materials[ materialName ] === undefined ) {

			this.createMaterial_( materialName );

		}

		return this.materials[ materialName ];

	},

	createMaterial_: function ( materialName ) {

		// Create material

		var scope = this;
		var mat = this.materialsInfo[ materialName ];
		var params = {

			name: materialName,
			side: this.side

		};

		function resolveURL( baseUrl, url ) {

			if ( typeof url !== 'string' || url === '' )
				return '';

			// Absolute URL
			if ( /^https?:\/\//i.test( url ) ) return url;

			return baseUrl + url;

		}

		function setMapForType( mapType, value ) {

			if ( params[ mapType ] ) return; // Keep the first encountered texture

			var texParams = scope.getTextureParams( value, params );
			var map = scope.loadTexture( resolveURL( scope.baseUrl, texParams.url ) );

			map.repeat.copy( texParams.scale );
			map.offset.copy( texParams.offset );

			map.wrapS = scope.wrap;
			map.wrapT = scope.wrap;

			params[ mapType ] = map;

		}

		for ( var prop in mat ) {

			var value = mat[ prop ];
			var n;

			if ( value === '' ) continue;

			switch ( prop.toLowerCase() ) {

				// Ns is material specular exponent

				case 'kd':

					// Diffuse color (color under white light) using RGB values

					params.color = new THREE.Color().fromArray( value );

					break;

				case 'ks':

					// Specular color (color when light is reflected from shiny surface) using RGB values
					params.specular = new THREE.Color().fromArray( value );

					break;

				case 'map_kd':

					// Diffuse texture map

					setMapForType( "map", value );

					break;

				case 'map_ks':

					// Specular map

					setMapForType( "specularMap", value );

					break;

				case 'norm':

					setMapForType( "normalMap", value );

					break;

				case 'map_bump':
				case 'bump':

					// Bump texture map

					setMapForType( "bumpMap", value );

					break;

				case 'ns':

					// The specular exponent (defines the focus of the specular highlight)
					// A high exponent results in a tight, concentrated highlight. Ns values normally range from 0 to 1000.

					params.shininess = parseFloat( value );

					break;

				case 'd':
					n = parseFloat( value );

					if ( n < 1 ) {

						params.opacity = n;
						params.transparent = true;

					}

					break;

				case 'tr':
					n = parseFloat( value );

					if ( this.options && this.options.invertTrProperty ) n = 1 - n;

					if ( n > 0 ) {

						params.opacity = 1 - n;
						params.transparent = true;

					}

					break;

				default:
					break;

			}

		}

		this.materials[ materialName ] = new THREE.MeshPhongMaterial( params );
		return this.materials[ materialName ];

	},

	getTextureParams: function ( value, matParams ) {

		var texParams = {

			scale: new THREE.Vector2( 1, 1 ),
			offset: new THREE.Vector2( 0, 0 )

		 };

		var items = value.split( /\s+/ );
		var pos;

		pos = items.indexOf( '-bm' );

		if ( pos >= 0 ) {

			matParams.bumpScale = parseFloat( items[ pos + 1 ] );
			items.splice( pos, 2 );

		}

		pos = items.indexOf( '-s' );

		if ( pos >= 0 ) {

			texParams.scale.set( parseFloat( items[ pos + 1 ] ), parseFloat( items[ pos + 2 ] ) );
			items.splice( pos, 4 ); // we expect 3 parameters here!

		}

		pos = items.indexOf( '-o' );

		if ( pos >= 0 ) {

			texParams.offset.set( parseFloat( items[ pos + 1 ] ), parseFloat( items[ pos + 2 ] ) );
			items.splice( pos, 4 ); // we expect 3 parameters here!

		}

		texParams.url = items.join( ' ' ).trim();
		return texParams;

	},

	loadTexture: function ( url, mapping, onLoad, onProgress, onError ) {

		var texture;
		var loader = THREE.Loader.Handlers.get( url );
		var manager = ( this.manager !== undefined ) ? this.manager : THREE.DefaultLoadingManager;

		if ( loader === null ) {

			loader = new THREE.TextureLoader( manager );

		}

		if ( loader.setCrossOrigin ) loader.setCrossOrigin( this.crossOrigin );
		texture = loader.load( url, onLoad, onProgress, onError );

		if ( mapping !== undefined ) texture.mapping = mapping;

		return texture;

	}

};

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

THREE.OBJLoader = ( function () {

	// o object_name | g group_name
	var object_pattern = /^[og]\s*(.+)?/;
	// mtllib file_reference
	var material_library_pattern = /^mtllib /;
	// usemtl material_name
	var material_use_pattern = /^usemtl /;

	function ParserState() {

		var state = {
			objects: [],
			object: {},

			vertices: [],
			normals: [],
			colors: [],
			uvs: [],

			materialLibraries: [],

			startObject: function ( name, fromDeclaration ) {

				// If the current object (initial from reset) is not from a g/o declaration in the parsed
				// file. We need to use it for the first parsed g/o to keep things in sync.
				if ( this.object && this.object.fromDeclaration === false ) {

					this.object.name = name;
					this.object.fromDeclaration = ( fromDeclaration !== false );
					return;

				}

				var previousMaterial = ( this.object && typeof this.object.currentMaterial === 'function' ? this.object.currentMaterial() : undefined );

				if ( this.object && typeof this.object._finalize === 'function' ) {

					this.object._finalize( true );

				}

				this.object = {
					name: name || '',
					fromDeclaration: ( fromDeclaration !== false ),

					geometry: {
						vertices: [],
						normals: [],
						colors: [],
						uvs: []
					},
					materials: [],
					smooth: true,

					startMaterial: function ( name, libraries ) {

						var previous = this._finalize( false );

						// New usemtl declaration overwrites an inherited material, except if faces were declared
						// after the material, then it must be preserved for proper MultiMaterial continuation.
						if ( previous && ( previous.inherited || previous.groupCount <= 0 ) ) {

							this.materials.splice( previous.index, 1 );

						}

						var material = {
							index: this.materials.length,
							name: name || '',
							mtllib: ( Array.isArray( libraries ) && libraries.length > 0 ? libraries[ libraries.length - 1 ] : '' ),
							smooth: ( previous !== undefined ? previous.smooth : this.smooth ),
							groupStart: ( previous !== undefined ? previous.groupEnd : 0 ),
							groupEnd: - 1,
							groupCount: - 1,
							inherited: false,

							clone: function ( index ) {

								var cloned = {
									index: ( typeof index === 'number' ? index : this.index ),
									name: this.name,
									mtllib: this.mtllib,
									smooth: this.smooth,
									groupStart: 0,
									groupEnd: - 1,
									groupCount: - 1,
									inherited: false
								};
								cloned.clone = this.clone.bind( cloned );
								return cloned;

							}
						};

						this.materials.push( material );

						return material;

					},

					currentMaterial: function () {

						if ( this.materials.length > 0 ) {

							return this.materials[ this.materials.length - 1 ];

						}

						return undefined;

					},

					_finalize: function ( end ) {

						var lastMultiMaterial = this.currentMaterial();
						if ( lastMultiMaterial && lastMultiMaterial.groupEnd === - 1 ) {

							lastMultiMaterial.groupEnd = this.geometry.vertices.length / 3;
							lastMultiMaterial.groupCount = lastMultiMaterial.groupEnd - lastMultiMaterial.groupStart;
							lastMultiMaterial.inherited = false;

						}

						// Ignore objects tail materials if no face declarations followed them before a new o/g started.
						if ( end && this.materials.length > 1 ) {

							for ( var mi = this.materials.length - 1; mi >= 0; mi -- ) {

								if ( this.materials[ mi ].groupCount <= 0 ) {

									this.materials.splice( mi, 1 );

								}

							}

						}

						// Guarantee at least one empty material, this makes the creation later more straight forward.
						if ( end && this.materials.length === 0 ) {

							this.materials.push( {
								name: '',
								smooth: this.smooth
							} );

						}

						return lastMultiMaterial;

					}
				};

				// Inherit previous objects material.
				// Spec tells us that a declared material must be set to all objects until a new material is declared.
				// If a usemtl declaration is encountered while this new object is being parsed, it will
				// overwrite the inherited material. Exception being that there was already face declarations
				// to the inherited material, then it will be preserved for proper MultiMaterial continuation.

				if ( previousMaterial && previousMaterial.name && typeof previousMaterial.clone === 'function' ) {

					var declared = previousMaterial.clone( 0 );
					declared.inherited = true;
					this.object.materials.push( declared );

				}

				this.objects.push( this.object );

			},

			finalize: function () {

				if ( this.object && typeof this.object._finalize === 'function' ) {

					this.object._finalize( true );

				}

			},

			parseVertexIndex: function ( value, len ) {

				var index = parseInt( value, 10 );
				return ( index >= 0 ? index - 1 : index + len / 3 ) * 3;

			},

			parseNormalIndex: function ( value, len ) {

				var index = parseInt( value, 10 );
				return ( index >= 0 ? index - 1 : index + len / 3 ) * 3;

			},

			parseUVIndex: function ( value, len ) {

				var index = parseInt( value, 10 );
				return ( index >= 0 ? index - 1 : index + len / 2 ) * 2;

			},

			addVertex: function ( a, b, c ) {

				var src = this.vertices;
				var dst = this.object.geometry.vertices;

				dst.push( src[ a + 0 ], src[ a + 1 ], src[ a + 2 ] );
				dst.push( src[ b + 0 ], src[ b + 1 ], src[ b + 2 ] );
				dst.push( src[ c + 0 ], src[ c + 1 ], src[ c + 2 ] );

			},

			addVertexPoint: function ( a ) {

				var src = this.vertices;
				var dst = this.object.geometry.vertices;

				dst.push( src[ a + 0 ], src[ a + 1 ], src[ a + 2 ] );

			},

			addVertexLine: function ( a ) {

				var src = this.vertices;
				var dst = this.object.geometry.vertices;

				dst.push( src[ a + 0 ], src[ a + 1 ], src[ a + 2 ] );

			},

			addNormal: function ( a, b, c ) {

				var src = this.normals;
				var dst = this.object.geometry.normals;

				dst.push( src[ a + 0 ], src[ a + 1 ], src[ a + 2 ] );
				dst.push( src[ b + 0 ], src[ b + 1 ], src[ b + 2 ] );
				dst.push( src[ c + 0 ], src[ c + 1 ], src[ c + 2 ] );

			},

			addColor: function ( a, b, c ) {

				var src = this.colors;
				var dst = this.object.geometry.colors;

				dst.push( src[ a + 0 ], src[ a + 1 ], src[ a + 2 ] );
				dst.push( src[ b + 0 ], src[ b + 1 ], src[ b + 2 ] );
				dst.push( src[ c + 0 ], src[ c + 1 ], src[ c + 2 ] );

			},

			addUV: function ( a, b, c ) {

				var src = this.uvs;
				var dst = this.object.geometry.uvs;

				dst.push( src[ a + 0 ], src[ a + 1 ] );
				dst.push( src[ b + 0 ], src[ b + 1 ] );
				dst.push( src[ c + 0 ], src[ c + 1 ] );

			},

			addUVLine: function ( a ) {

				var src = this.uvs;
				var dst = this.object.geometry.uvs;

				dst.push( src[ a + 0 ], src[ a + 1 ] );

			},

			addFace: function ( a, b, c, ua, ub, uc, na, nb, nc ) {

				var vLen = this.vertices.length;

				var ia = this.parseVertexIndex( a, vLen );
				var ib = this.parseVertexIndex( b, vLen );
				var ic = this.parseVertexIndex( c, vLen );

				this.addVertex( ia, ib, ic );

				if ( ua !== undefined && ua !== '' ) {

					var uvLen = this.uvs.length;
					ia = this.parseUVIndex( ua, uvLen );
					ib = this.parseUVIndex( ub, uvLen );
					ic = this.parseUVIndex( uc, uvLen );
					this.addUV( ia, ib, ic );

				}

				if ( na !== undefined && na !== '' ) {

					// Normals are many times the same. If so, skip function call and parseInt.
					var nLen = this.normals.length;
					ia = this.parseNormalIndex( na, nLen );

					ib = na === nb ? ia : this.parseNormalIndex( nb, nLen );
					ic = na === nc ? ia : this.parseNormalIndex( nc, nLen );

					this.addNormal( ia, ib, ic );

				}

				if ( this.colors.length > 0 ) {

					this.addColor( ia, ib, ic );

				}

			},

			addPointGeometry: function ( vertices ) {

				this.object.geometry.type = 'Points';

				var vLen = this.vertices.length;

				for ( var vi = 0, l = vertices.length; vi < l; vi ++ ) {

					this.addVertexPoint( this.parseVertexIndex( vertices[ vi ], vLen ) );

				}

			},

			addLineGeometry: function ( vertices, uvs ) {

				this.object.geometry.type = 'Line';

				var vLen = this.vertices.length;
				var uvLen = this.uvs.length;

				for ( var vi = 0, l = vertices.length; vi < l; vi ++ ) {

					this.addVertexLine( this.parseVertexIndex( vertices[ vi ], vLen ) );

				}

				for ( var uvi = 0, l = uvs.length; uvi < l; uvi ++ ) {

					this.addUVLine( this.parseUVIndex( uvs[ uvi ], uvLen ) );

				}

			}

		};

		state.startObject( '', false );

		return state;

	}

	//

	function OBJLoader( manager ) {

		this.manager = ( manager !== undefined ) ? manager : THREE.DefaultLoadingManager;

		this.materials = null;

	}

	OBJLoader.prototype = {

		constructor: OBJLoader,

		load: function ( url, onLoad, onProgress, onError ) {

			var scope = this;

			var loader = new THREE.FileLoader( scope.manager );
			loader.setPath( this.path );
			loader.load( url, function ( text ) {

				onLoad( scope.parse( text ) );

			}, onProgress, onError );

		},

		setPath: function ( value ) {

			this.path = value;

			return this;

		},

		setMaterials: function ( materials ) {

			this.materials = materials;

			return this;

		},

		parse: function ( text ) {

			console.time( 'OBJLoader' );

			var state = new ParserState();

			if ( text.indexOf( '\r\n' ) !== - 1 ) {

				// This is faster than String.split with regex that splits on both
				text = text.replace( /\r\n/g, '\n' );

			}

			if ( text.indexOf( '\\\n' ) !== - 1 ) {

				// join lines separated by a line continuation character (\)
				text = text.replace( /\\\n/g, '' );

			}

			var lines = text.split( '\n' );
			var line = '', lineFirstChar = '';
			var lineLength = 0;
			var result = [];

			// Faster to just trim left side of the line. Use if available.
			var trimLeft = ( typeof ''.trimLeft === 'function' );

			for ( var i = 0, l = lines.length; i < l; i ++ ) {

				line = lines[ i ];

				line = trimLeft ? line.trimLeft() : line.trim();

				lineLength = line.length;

				if ( lineLength === 0 ) continue;

				lineFirstChar = line.charAt( 0 );

				// @todo invoke passed in handler if any
				if ( lineFirstChar === '#' ) continue;

				if ( lineFirstChar === 'v' ) {

					var data = line.split( /\s+/ );

					switch ( data[ 0 ] ) {

						case 'v':
							state.vertices.push(
								parseFloat( data[ 1 ] ),
								parseFloat( data[ 2 ] ),
								parseFloat( data[ 3 ] )
							);
							if ( data.length === 8 ) {

								state.colors.push(
									parseFloat( data[ 4 ] ),
									parseFloat( data[ 5 ] ),
									parseFloat( data[ 6 ] )

								);

							}
							break;
						case 'vn':
							state.normals.push(
								parseFloat( data[ 1 ] ),
								parseFloat( data[ 2 ] ),
								parseFloat( data[ 3 ] )
							);
							break;
						case 'vt':
							state.uvs.push(
								parseFloat( data[ 1 ] ),
								parseFloat( data[ 2 ] )
							);
							break;

					}

				} else if ( lineFirstChar === 'f' ) {

					var lineData = line.substr( 1 ).trim();
					var vertexData = lineData.split( /\s+/ );
					var faceVertices = [];

					// Parse the face vertex data into an easy to work with format

					for ( var j = 0, jl = vertexData.length; j < jl; j ++ ) {

						var vertex = vertexData[ j ];

						if ( vertex.length > 0 ) {

							var vertexParts = vertex.split( '/' );
							faceVertices.push( vertexParts );

						}

					}

					// Draw an edge between the first vertex and all subsequent vertices to form an n-gon

					var v1 = faceVertices[ 0 ];

					for ( var j = 1, jl = faceVertices.length - 1; j < jl; j ++ ) {

						var v2 = faceVertices[ j ];
						var v3 = faceVertices[ j + 1 ];

						state.addFace(
							v1[ 0 ], v2[ 0 ], v3[ 0 ],
							v1[ 1 ], v2[ 1 ], v3[ 1 ],
							v1[ 2 ], v2[ 2 ], v3[ 2 ]
						);

					}

				} else if ( lineFirstChar === 'l' ) {

					var lineParts = line.substring( 1 ).trim().split( " " );
					var lineVertices = [], lineUVs = [];

					if ( line.indexOf( "/" ) === - 1 ) {

						lineVertices = lineParts;

					} else {

						for ( var li = 0, llen = lineParts.length; li < llen; li ++ ) {

							var parts = lineParts[ li ].split( "/" );

							if ( parts[ 0 ] !== "" ) lineVertices.push( parts[ 0 ] );
							if ( parts[ 1 ] !== "" ) lineUVs.push( parts[ 1 ] );

						}

					}
					state.addLineGeometry( lineVertices, lineUVs );

				} else if ( lineFirstChar === 'p' ) {

					var lineData = line.substr( 1 ).trim();
					var pointData = lineData.split( " " );

					state.addPointGeometry( pointData );

				} else if ( ( result = object_pattern.exec( line ) ) !== null ) {

					// o object_name
					// or
					// g group_name

					// WORKAROUND: https://bugs.chromium.org/p/v8/issues/detail?id=2869
					// var name = result[ 0 ].substr( 1 ).trim();
					var name = ( " " + result[ 0 ].substr( 1 ).trim() ).substr( 1 );

					state.startObject( name );

				} else if ( material_use_pattern.test( line ) ) {

					// material

					state.object.startMaterial( line.substring( 7 ).trim(), state.materialLibraries );

				} else if ( material_library_pattern.test( line ) ) {

					// mtl file

					state.materialLibraries.push( line.substring( 7 ).trim() );

				} else if ( lineFirstChar === 's' ) {

					result = line.split( ' ' );

					// smooth shading

					// @todo Handle files that have varying smooth values for a set of faces inside one geometry,
					// but does not define a usemtl for each face set.
					// This should be detected and a dummy material created (later MultiMaterial and geometry groups).
					// This requires some care to not create extra material on each smooth value for "normal" obj files.
					// where explicit usemtl defines geometry groups.
					// Example asset: examples/models/obj/cerberus/Cerberus.obj

					/*
					 * http://paulbourke.net/dataformats/obj/
					 * or
					 * http://www.cs.utah.edu/~boulos/cs3505/obj_spec.pdf
					 *
					 * From chapter "Grouping" Syntax explanation "s group_number":
					 * "group_number is the smoothing group number. To turn off smoothing groups, use a value of 0 or off.
					 * Polygonal elements use group numbers to put elements in different smoothing groups. For free-form
					 * surfaces, smoothing groups are either turned on or off; there is no difference between values greater
					 * than 0."
					 */
					if ( result.length > 1 ) {

						var value = result[ 1 ].trim().toLowerCase();
						state.object.smooth = ( value !== '0' && value !== 'off' );

					} else {

						// ZBrush can produce "s" lines #11707
						state.object.smooth = true;

					}
					var material = state.object.currentMaterial();
					if ( material ) material.smooth = state.object.smooth;

				} else {

					// Handle null terminated files without exception
					if ( line === '\0' ) continue;

					throw new Error( 'THREE.OBJLoader: Unexpected line: "' + line + '"' );

				}

			}

			state.finalize();

			var container = new THREE.Group();
			container.materialLibraries = [].concat( state.materialLibraries );

			for ( var i = 0, l = state.objects.length; i < l; i ++ ) {

				var object = state.objects[ i ];
				var geometry = object.geometry;
				var materials = object.materials;
				var isLine = ( geometry.type === 'Line' );
				var isPoints = ( geometry.type === 'Points' );
				var hasVertexColors = false;

				// Skip o/g line declarations that did not follow with any faces
				if ( geometry.vertices.length === 0 ) continue;

				var buffergeometry = new THREE.BufferGeometry();

				buffergeometry.addAttribute( 'position', new THREE.Float32BufferAttribute( geometry.vertices, 3 ) );

				if ( geometry.normals.length > 0 ) {

					buffergeometry.addAttribute( 'normal', new THREE.Float32BufferAttribute( geometry.normals, 3 ) );

				} else {

					buffergeometry.computeVertexNormals();

				}

				if ( geometry.colors.length > 0 ) {

					hasVertexColors = true;
					buffergeometry.addAttribute( 'color', new THREE.Float32BufferAttribute( geometry.colors, 3 ) );

				}

				if ( geometry.uvs.length > 0 ) {

					buffergeometry.addAttribute( 'uv', new THREE.Float32BufferAttribute( geometry.uvs, 2 ) );

				}

				// Create materials

				var createdMaterials = [];

				for ( var mi = 0, miLen = materials.length; mi < miLen; mi ++ ) {

					var sourceMaterial = materials[ mi ];
					var material = undefined;

					if ( this.materials !== null ) {

						material = this.materials.create( sourceMaterial.name );

						// mtl etc. loaders probably can't create line materials correctly, copy properties to a line material.
						if ( isLine && material && ! ( material instanceof THREE.LineBasicMaterial ) ) {

							var materialLine = new THREE.LineBasicMaterial();
							materialLine.copy( material );
							materialLine.lights = false; // TOFIX
							material = materialLine;

						} else if ( isPoints && material && ! ( material instanceof THREE.PointsMaterial ) ) {

							var materialPoints = new THREE.PointsMaterial( { size: 10, sizeAttenuation: false } );
							materialLine.copy( material );
							material = materialPoints;

						}

					}

					if ( ! material ) {

						if ( isLine ) {

							material = new THREE.LineBasicMaterial();

						} else if ( isPoints ) {

							material = new THREE.PointsMaterial( { size: 1, sizeAttenuation: false } );

						} else {

							material = new THREE.MeshPhongMaterial();

						}

						material.name = sourceMaterial.name;

					}

					material.flatShading = sourceMaterial.smooth ? false : true;
					material.vertexColors = hasVertexColors ? THREE.VertexColors : THREE.NoColors;

					createdMaterials.push( material );

				}

				// Create mesh

				var mesh;

				if ( createdMaterials.length > 1 ) {

					for ( var mi = 0, miLen = materials.length; mi < miLen; mi ++ ) {

						var sourceMaterial = materials[ mi ];
						buffergeometry.addGroup( sourceMaterial.groupStart, sourceMaterial.groupCount, mi );

					}

					if ( isLine ) {

						mesh = new THREE.LineSegments( buffergeometry, createdMaterials );

					} else if ( isPoints ) {

						mesh = new THREE.Points( buffergeometry, createdMaterials );

					} else {

						mesh = new THREE.Mesh( buffergeometry, createdMaterials );

					}

				} else {

					if ( isLine ) {

						mesh = new THREE.LineSegments( buffergeometry, createdMaterials[ 0 ] );

					} else if ( isPoints ) {

						mesh = new THREE.Points( buffergeometry, createdMaterials[ 0 ] );

					} else {

						mesh = new THREE.Mesh( buffergeometry, createdMaterials[ 0 ] );

					}

				}

				mesh.name = object.name;

				container.add( mesh );

			}

			console.timeEnd( 'OBJLoader' );

			return container;

		}

	};

	return OBJLoader;

} )();

exports.MTLLoader = THREE.MTLLoader;
exports.OBJLoader = THREE.OBJLoader;