import { dirname, join, resolve, win32 } from "node:path";

/**
 * Recognize native Windows paths even when a portability test supplies one on
 * a Unix host. Production paths on Windows are handled by the native path
 * implementation; the explicit drive/UNC forms keep synthetic tests honest.
 */
export function isWindowsStylePath(value: string): boolean {
  return process.platform === "win32"
    ? win32.isAbsolute(value)
    : /^[a-zA-Z]:[\\/]/.test(value) || value.startsWith("\\\\") || value.startsWith("\\") || value.startsWith("//");
}

export function joinPortablePath(...parts: string[]): string {
  return parts.some(isWindowsStylePath) ? win32.join(...parts) : join(...parts);
}

export function dirnamePortablePath(value: string): string {
  return isWindowsStylePath(value) ? win32.dirname(value) : dirname(value);
}

export function resolvePortablePath(base: string, child: string): string {
  return isWindowsStylePath(base) || isWindowsStylePath(child)
    ? win32.resolve(base, child)
    : resolve(base, child);
}

export function normalizePortablePath(value: string): string {
  return isWindowsStylePath(value) ? win32.normalize(value) : resolve(value);
}

export function samePortablePath(left: string | undefined, right: string | undefined): boolean {
  if (!left || !right) return false;
  if (isWindowsStylePath(left) || isWindowsStylePath(right)) {
    const normalize = (value: string) =>
      normalizePortablePath(value).replace(/[\\/]+$/, "").toLowerCase();
    return normalize(left) === normalize(right);
  }
  return normalizePortablePath(left) === normalizePortablePath(right);
}