/**
 * Path utilities for virtual file systems
 */

/**
 * Normalize a path
 */
export function normalizePath(path: string): string {
  // Handle empty path as root
  if (!path) return "/";

  // Ensure path starts with /
  if (!path.startsWith("/")) {
    path = "/" + path;
  }

  // Remove duplicate slashes
  path = path.replace(/\/+/g, "/");

  // Remove trailing slash except for root
  if (path.length > 1 && path.endsWith("/")) {
    path = path.slice(0, -1);
  }

  return path;
}

/**
 * Get directory name from path
 */
export function dirname(path: string): string {
  const normalized = normalizePath(path);
  const lastSlash = normalized.lastIndexOf("/");
  return lastSlash === 0 ? "/" : normalized.slice(0, lastSlash);
}

/**
 * Get base name from path
 */
export function basename(path: string): string {
  const normalized = normalizePath(path);
  const lastSlash = normalized.lastIndexOf("/");
  return normalized.slice(lastSlash + 1);
}

/**
 * Join path segments
 */
export function join(...segments: string[]): string {
  const joined = segments.join("/");
  return normalizePath(joined);
}

/**
 * Check if path is absolute
 */
export function isAbsolute(path: string): boolean {
  return path.startsWith("/");
}

/**
 * Get file extension
 */
export function extname(path: string): string {
  const base = basename(path);
  const lastDot = base.lastIndexOf(".");
  return lastDot === -1 ? "" : base.slice(lastDot);
}