import { create } from 'zustand';
import { persist } from 'zustand/middleware';

interface User {
  id: string;
  email: string;
  name?: string;
  role: 'customer' | 'vendor' | 'admin';
  avatar_url?: string;
}

interface AuthStore {
  user: User | null;
  token: string | null;
  isLoading: boolean;
  error: string | null;
  
  login: (email: string, password: string) => Promise<boolean>;
  register: (data: { email: string; password: string; name: string }) => Promise<boolean>;
  logout: () => Promise<void>;
  fetchUser: () => Promise<void>;
  clearError: () => void;
}

export const useAuthStore = create<AuthStore>()(
  persist(
    (set, get) => ({
      user: null,
      token: null,
      isLoading: false,
      error: null,
      
      login: async (email, password) => {
        set({ isLoading: true, error: null });
        try {
          const res = await fetch('/api/auth/login', {
            method: 'POST',
            headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify({ email, password })
          });
          
          if (!res.ok) {
            const data = await res.json();
            set({ error: data.error || 'Login failed' });
            return false;
          }
          
          const { user, token } = await res.json();
          set({ user, token, isLoading: false });
          return true;
        } catch (error) {
          set({ error: 'Network error', isLoading: false });
          return false;
        }
      },
      
      register: async (data) => {
        set({ isLoading: true, error: null });
        try {
          const res = await fetch('/api/auth/register', {
            method: 'POST',
            headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify(data)
          });
          
          if (!res.ok) {
            const error = await res.json();
            set({ error: error.error || 'Registration failed' });
            return false;
          }
          
          const { user, token } = await res.json();
          set({ user, token, isLoading: false });
          return true;
        } catch (error) {
          set({ error: 'Network error', isLoading: false });
          return false;
        }
      },
      
      logout: async () => {
        await fetch('/api/auth/logout', { method: 'POST' });
        set({ user: null, token: null });
      },
      
      fetchUser: async () => {
        const token = get().token;
        if (!token) return;
        
        try {
          const res = await fetch('/api/auth/me', {
            headers: { 'Authorization': `Bearer ${token}` }
          });
          
          if (res.ok) {
            const { user } = await res.json();
            set({ user });
          } else {
            set({ user: null, token: null });
          }
        } catch {
          set({ user: null, token: null });
        }
      },
      
      clearError: () => set({ error: null })
    }),
    {
      name: 'auth-storage',
      partialize: (state) => ({ user: state.user, token: state.token })
    }
  )
);