/**
 * Global app preferences & UI state store.
 *
 * Manages cross-cutting concerns like the user's current role,
 * online status, and theme preference. These are persisted
 * separately from auth because they survive logouts.
 */
import { create } from 'zustand';
import { persist, createJSONStorage } from 'zustand/middleware';
import type { UserRole } from '../types/user';

// ─── State Shape ─────────────────────────────────────────────────────────────

interface AppState {
  /** The role the user is currently acting as (rider or passenger) */
  currentRole: UserRole;
  /** Whether the user is visible to others as online */
  isOnline: boolean;
  /** Whether dark mode is active */
  isDarkMode: boolean;
  /** Whether push notifications are enabled */
  notificationsEnabled: boolean;
}

// ─── Actions ─────────────────────────────────────────────────────────────────

interface AppActions {
  /** Switch between rider and passenger mode */
  setRole: (role: UserRole) => void;
  /** Toggle online/offline visibility */
  setOnline: (value: boolean) => void;
  /** Toggle dark mode */
  setDarkMode: (value: boolean) => void;
  /** Toggle notifications */
  setNotificationsEnabled: (value: boolean) => void;
}

// ─── Persisted Store ─────────────────────────────────────────────────────────

export const useAppStore = create<AppState & AppActions>()(
  persist(
    (set) => ({
      // Initial / default state
      currentRole: 'rider' as UserRole,
      isOnline: true,
      isDarkMode: false,
      notificationsEnabled: true,

      // Actions
      setRole: (role) =>
        set({ currentRole: role }),

      setOnline: (value) =>
        set({ isOnline: value }),

      setDarkMode: (value) =>
        set({ isDarkMode: value }),

      setNotificationsEnabled: (value) =>
        set({ notificationsEnabled: value }),
    }),
    {
      name: 'antaram-app-storage',
      storage: createJSONStorage(() => {
        // AsyncStorage will be used in React Native by default when available
        // This also falls back to localStorage in web / Expo web
        try {
          // eslint-disable-next-line @typescript-eslint/no-require-imports
          const { AsyncStorage } = require('@react-native-async-storage/async-storage');
          return AsyncStorage;
        } catch {
          // Web fallback
          return localStorage;
        }
      }),
      // Only persist these specific keys
      partialize: (state) => ({
        currentRole: state.currentRole,
        isOnline: state.isOnline,
        isDarkMode: state.isDarkMode,
        notificationsEnabled: state.notificationsEnabled,
      }),
    },
  ),
);

// ─── Selectors ───────────────────────────────────────────────────────────────

export const selectIsRider = (state: AppState) => state.currentRole === 'rider';
export const selectIsPassenger = (state: AppState) => state.currentRole === 'passenger';