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

THREE.VTKLoader = function ( manager ) {

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

};

THREE.VTKLoader.prototype = {

	constructor: THREE.VTKLoader,

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

		var scope = this;

		var loader = new THREE.XHRLoader( scope.manager );
		loader.setCrossOrigin( this.crossOrigin );
		loader.load( url, function ( text ) {

			onLoad( scope.parse( text ) );

		}, onProgress, onError );

	},

	parse: function ( data ) {

		var indices = [];
		var positions = [];

		var pattern, result;

		// float float float

		pattern = /([\+|\-]?[\d]+[\.][\d|\-|e]+)[ ]+([\+|\-]?[\d]+[\.][\d|\-|e]+)[ ]+([\+|\-]?[\d]+[\.][\d|\-|e]+)/g;

		while ( ( result = pattern.exec( data ) ) !== null ) {

			// ["1.0 2.0 3.0", "1.0", "2.0", "3.0"]

			positions.push( parseFloat( result[ 1 ] ), parseFloat( result[ 2 ] ), parseFloat( result[ 3 ] ) );

		}

		// 3 int int int

		pattern = /3[ ]+([\d]+)[ ]+([\d]+)[ ]+([\d]+)/g;

		while ( ( result = pattern.exec( data ) ) !== null ) {

			// ["3 1 2 3", "1", "2", "3"]

			indices.push( parseInt( result[ 1 ] ), parseInt( result[ 2 ] ), parseInt( result[ 3 ] ) );

		}

		// 4 int int int int

		pattern = /4[ ]+([\d]+)[ ]+([\d]+)[ ]+([\d]+)[ ]+([\d]+)/g;

		while ( ( result = pattern.exec( data ) ) !== null ) {

			// ["4 1 2 3 4", "1", "2", "3", "4"]

			indices.push( parseInt( result[ 1 ] ), parseInt( result[ 2 ] ), parseInt( result[ 4 ] ) );
			indices.push( parseInt( result[ 2 ] ), parseInt( result[ 3 ] ), parseInt( result[ 4 ] ) );

		}

		var geometry = new THREE.BufferGeometry();
		geometry.addAttribute( 'index', new THREE.BufferAttribute( new ( indices.length > 65535 ? Uint32Array : Uint16Array )( indices ), 1 ) );
		geometry.addAttribute( 'position', new THREE.BufferAttribute( new Float32Array( positions ), 3 ) );

		return geometry;

	}

};

THREE.EventDispatcher.prototype.apply( THREE.VTKLoader.prototype );