import { type Href } from 'expo-router';

import { User } from '@/lib/api';

export type AuthStatus =

  | 'loading'

  | 'signedOut'

  | 'awaitingActivation'

  | 'active';

// The single source of truth for "where does this account belong". Everything

// that routes on auth state reads this instead of re-deriving it from

// `user.active` and ad-hoc booleans.

export function deriveStatus(isLoading: boolean, user: User | null): AuthStatus {

  if (isLoading) return 'loading';

  if (!user) return 'signedOut';

  if (!user.active) return 'awaitingActivation';

  return 'active';

}

// `null` means "still loading — show a spinner, do not navigate".

export function routeForStatus(

  status: AuthStatus,

  user: User | null,

): Href | null {

  switch (status) {

    case 'loading':

      return null;

    case 'signedOut':

      return '/auth/login';

    case 'awaitingActivation':

      return '/auth/activate';

    case 'active':

      return user?.onboardingSeenAt ? '/(tabs)/new' : '/onboarding';

  }

}