export function getIconClasses(modelService: IModelService, modeService: IModeService, resource: uri | undefined, fileKind?: FileKind): string[] {

	// we always set these base classes even if we do not have a path
	const classes = fileKind === FileKind.ROOT_FOLDER ? ['rootfolder-icon'] : fileKind === FileKind.FOLDER ? ['folder-icon'] : ['file-icon'];
	if (resource) {

		// Get the path and name of the resource. For data-URIs, we need to parse specially
		let name: string | undefined;
		let path: string | undefined;
		if (resource.scheme === Schemas.data) {
			const metadata = DataUri.parseMetaData(resource);
			name = metadata.get(DataUri.META_DATA_LABEL);
			path = name;
		} else {
			name = cssEscape(basenameOrAuthority(resource).toLowerCase());
			path = resource.path.toLowerCase();
		}

		// Folders
		if (fileKind === FileKind.FOLDER) {
			classes.push(`${name}-name-folder-icon`);
		}

		// Files
		else {

			// Name & Extension(s)
			if (name) {
				classes.push(`${name}-name-file-icon`);
				const dotSegments = name.split('.');
				for (let i = 1; i < dotSegments.length; i++) {
					classes.push(`${dotSegments.slice(i).join('.')}-ext-file-icon`); // add each combination of all found extensions if more than one
				}
				classes.push(`ext-file-icon`); // extra segment to increase file-ext score
			}

			// Configured Language
			let configuredLangId: string | null = getConfiguredLangId(modelService, modeService, resource);
			configuredLangId = configuredLangId || (path ? modeService.getModeIdByFilepathOrFirstLine(path) : null);
			if (configuredLangId) {
				classes.push(`${cssEscape(configuredLangId)}-lang-file-icon`);
			}
		}
	}
	return classes;
}

	public static getEncodedDebugData(modelUri: uri): { name: string, path: string, sessionId: string, sourceReference: number } {
		let path: string;
		let sourceReference: number;
		let sessionId: string;

		switch (modelUri.scheme) {
			case Schemas.file:
				path = paths.normalize(modelUri.fsPath, true);
				break;
			case DEBUG_SCHEME:
				path = modelUri.path;
				if (modelUri.query) {
					const keyvalues = modelUri.query.split('&');
					for (let keyvalue of keyvalues) {
						const pair = keyvalue.split('=');
						if (pair.length === 2) {
							switch (pair[0]) {
								case 'session':
									sessionId = decodeURIComponent(pair[1]);
									break;
								case 'ref':
									sourceReference = parseInt(pair[1]);
									break;
							}
						}
					}
				}
				break;
			default:
				path = modelUri.toString();
				break;
		}

		return {
			name: resources.basenameOrAuthority(modelUri),
			path,
			sourceReference,
			sessionId
		};
	}

	public get name() {
		return this.raw.name || resources.basenameOrAuthority(this.uri);
	}