import { hash } from './StringUtils';

const WINDOWS_PATH_REGEXP = /^([a-zA-Z]:.*)$/;
const UNC_WINDOWS_PATH_REGEXP = /^\\\\(\.\\)?(.*)$/;

export function toPortablePath(filepath: string): string {
	if (process.platform !== `win32`) return filepath;

	if (filepath.match(WINDOWS_PATH_REGEXP)) filepath = filepath.replace(WINDOWS_PATH_REGEXP, `/$1`);
	else if (filepath.match(UNC_WINDOWS_PATH_REGEXP))
		filepath = filepath.replace(
			UNC_WINDOWS_PATH_REGEXP,
			(match, p1, p2) => `/unc/${p1 ? `.dot/` : ``}${p2}`,
		);

	return filepath.replace(/\\/g, `/`);
}

/**
 * Create deterministic valid database name (class, database) of fixed length from any filepath. Equivalent paths for windows/posix systems should
 * be equivalent to enable portability
 */
export function filepathToName(filepath: string): string {
	const uniq = toPortablePath(filepath).toLowerCase();
	return hash(uniq, { length: 63 });
}

/**
 * Cross platform isAbsolute
 */
export function isAbsolute(filepath: string): boolean {
	return !!filepath.match(/^(?:[a-z]:|[\\]|[/])/i);
}