import { createStore } from 'zustand/vanilla'
import { persist, createJSONStorage } from 'zustand/middleware'
import { get, set, del } from 'idb-keyval'

// Create IndexedDB storage adapter with error handling
const storage = createJSONStorage(() => ({
  getItem: async (name) => {
    try {
      const value = await get(name)
      return value ?? null
    } catch (error) {
      console.error('IndexedDB getItem error:', error)
      return null // Fallback to null if IndexedDB fails
    }
  },
  setItem: async (name, value) => {
    try {
      await set(name, value)
    } catch (error) {
      console.error('IndexedDB setItem error:', error)
      // Silently fail - app continues to work without persistence
    }
  },
  removeItem: async (name) => {
    try {
      await del(name)
    } catch (error) {
      console.error('IndexedDB removeItem error:', error)
      // Silently fail
    }
  },
}))

export const store = createStore(
  persist(
    (set, get) => ({
      _hydrated: true,  // Start as true - persistence happens in background
      user: null,
      items: [],
      route: 'home',
      error: null,  // For error notifications
      
      // Actions
      setUser: (user) => set({ user }),
      
      addItem: (item) => {
        try {
          if (!item || !item.name || !item.name.trim()) {
            throw new Error('Item name is required')
          }
          set(s => ({ items: [...s.items, item], error: null }))
        } catch (error) {
          console.error('addItem error:', error)
          set({ error: error.message })
          setTimeout(() => set({ error: null }), 3000) // Clear after 3s
        }
      },
      
      removeItem: (id) => {
        try {
          if (!id) {
            throw new Error('Item ID is required')
          }
          set(s => ({ items: s.items.filter(i => i.id !== id), error: null }))
        } catch (error) {
          console.error('removeItem error:', error)
          set({ error: error.message })
          setTimeout(() => set({ error: null }), 3000)
        }
      },
      
      navigate: (route) => set({ route }),
      
      clearError: () => set({ error: null }),
    }),
    {
      name: 'app-store',
      storage,
      partialize: (state) => ({
        user: state.user,
        items: state.items,
        route: state.route,
      }),
    }
  )
)