import { createClient } from '@supabase/supabase-js'

const rawUrl = import.meta.env.VITE_SUPABASE_URL
const anonKey = import.meta.env.VITE_SUPABASE_ANON_KEY

if (!rawUrl || !anonKey) {
  throw new Error(
    'Missing VITE_SUPABASE_URL / VITE_SUPABASE_ANON_KEY. Copy .env.example to .env.local and fill them in ' +
      '(run `npx supabase start` then `npx supabase status` for local values).',
  )
}

/** Local Supabase (127.0.0.1/localhost) only: swap in whatever hostname the
 *  page itself was loaded from. Lets `npm run dev:lan` + a phone on the same
 *  Wi-Fi work without ever hand-editing VITE_SUPABASE_URL — loading the app
 *  via the LAN IP makes API calls target that same IP instead of a loopback
 *  address the phone can't reach. Never touches a real (non-local)
 *  production URL, so this is a no-op outside local dev. */
function resolveUrl(value: string): string {
  const url = new URL(value)
  if (url.hostname === '127.0.0.1' || url.hostname === 'localhost') {
    url.hostname = window.location.hostname
  }
  return url.toString()
}

export const supabase = createClient(resolveUrl(rawUrl), anonKey)