export type PathSet = 'asset' | 'energy';

interface BrowserLocation {
  pathname: string;
  search: string;
  hash: string;
}
const ROOT_PATHS = new Set(['/asset', '/energy', '/ele/import', '/admin/feedback']);

const LEGACY_PATHS: Record<string, { path: string; hash?: string }> = {
  '/': { path: '/asset' },
  '/vehicle': { path: '/asset', hash: 'assets' },
  '/assets': { path: '/asset', hash: 'assets' },
  '/mileage': { path: '/asset', hash: 'mileage' },
  '/scheduling': { path: '/asset', hash: 'scheduling' },
};

/** 返回旧地址应替换成的规范地址；主路径返回 null。 */
export function resolveCanonicalUrl(location: BrowserLocation): string | null {
  if (ROOT_PATHS.has(location.pathname)) return null;

  const target = LEGACY_PATHS[location.pathname] ?? { path: '/asset' };
  const finalHash = target.hash ? `#${target.hash}` : location.hash;
  return `${target.path}${location.search}${finalHash}`;
}

export function normalizeBrowserPath(): void {
  if (typeof window === 'undefined') return;
  const target = resolveCanonicalUrl(window.location);
  if (target) window.history.replaceState(null, '', target);
}

export function getPathSet(pathname: string): PathSet {
  return pathname === '/energy' ? 'energy' : 'asset';
}

export function getRouteKey(pathname: string, hash: string): string {
  if (pathname === '/ele/import' || hash === '#/ele/import' || hash === '#ele/import') {
    return 'ele/import';
  }
  if (
    pathname === '/admin/feedback'
    || hash === '#/admin/feedback'
    || hash === '#admin/feedback'
  ) {
    return 'admin/feedback';
  }
  return '';
}

export function readBrowserRoute(): { routeKey: string; pathSet: PathSet } {
  return {
    routeKey: getRouteKey(window.location.pathname, window.location.hash),
    pathSet: getPathSet(window.location.pathname),
  };
}