// Single source for the app's mount path. Vite injects import.meta.env.BASE_URL
// from the build-time `base` (default '/', or e.g. '/ops/' for a subpath IIS
// mount). Every root-absolute URL to a Flask-served asset or route must go
// through withBase() so it resolves under the mount instead of the server root.
export const BASE_URL = import.meta.env.BASE_URL

// Prefix a root-absolute path (e.g. '/ge-aerospace-logo.svg', '/api', '/tv')
// with the mount base. Leaves full URLs (http, data:) untouched.
export function withBase(path) {
  if (!path) return path
  if (/^([a-z]+:)?\/\//i.test(path) || path.startsWith('data:')) return path
  return BASE_URL + String(path).replace(/^\//, '')
}

// Inverse of withBase: turn a browser pathname (which includes the mount
// base, e.g. '/ops/computers') into a router path ('/computers'). Router
// navigation already applies the base; feeding it an un-stripped pathname
// double-prefixes ('/ops/ops/...').
export function stripBase(path) {
  if (!path) return path
  if (BASE_URL !== '/' && path.startsWith(BASE_URL)) {
    return '/' + path.slice(BASE_URL.length)
  }
  return path
}
