import { createContext, useContext, useState, useEffect, ReactNode } from 'react';
import { User, LoginDTO, JwtResponseDTO } from '@/types/auth';
import { api } from '@/services/api';

interface AuthContextType {
  user: User | null;
  loading: boolean;
  login: (credentials: LoginDTO) => Promise<void>;
  logout: () => void;
  isAuthenticated: boolean;
  hasRole: (role: string) => boolean;
  hasAnyRole: (roles: string[]) => boolean;
}

const AuthContext = createContext<AuthContextType | undefined>(undefined);

export function AuthProvider({ children }: { children: ReactNode }) {
  const [user, setUser] = useState<User | null>(null);
  const [loading, setLoading] = useState(true);

  useEffect(() => {
    // Verificar se há token e dados do usuário no localStorage
    const token = localStorage.getItem('token');
    const userData = localStorage.getItem('user');

    if (token && userData) {
      try {
        const parsedUser = JSON.parse(userData);
        // Validar se o usuário tem ID (compatibilidade com versões anteriores)
        if (!parsedUser.id) {
          console.warn('Usuário sem ID encontrado no storage. Forçando logout.');
          localStorage.removeItem('token');
          localStorage.removeItem('user');
          setUser(null);
        } else {
          setUser(parsedUser);
        }
      } catch (error) {
        console.error('Erro ao parsear dados do usuário:', error);
        localStorage.removeItem('token');
        localStorage.removeItem('user');
      }
    }
    setLoading(false);
  }, []);

  const login = async (credentials: LoginDTO) => {
    try {
      const response: JwtResponseDTO = await api.post<JwtResponseDTO>(
        '/auth/login',
        credentials
      );

      // Salvar token e dados do usuário
      localStorage.setItem('token', response.token);
      localStorage.setItem('refreshToken', response.refreshToken);

      const userData: User = {
        id: response.id,
        username: response.username,
        fullName: response.fullName,
        email: response.email,
        roles: response.roles,
      };

      localStorage.setItem('user', JSON.stringify(userData));
      setUser(userData);
    } catch (error: any) {
      const errorMessage =
        error.response?.data?.message ||
        error.message ||
        'Erro ao fazer login';
      throw new Error(errorMessage);
    }
  };

  const logout = () => {
    localStorage.removeItem('token');
    localStorage.removeItem('refreshToken');
    localStorage.removeItem('user');
    setUser(null);
  };

  const hasRole = (role: string): boolean => {
    return user?.roles.includes(role) ?? false;
  };

  const hasAnyRole = (roles: string[]): boolean => {
    if (!user) return false;
    return roles.some((role) => user.roles.includes(role));
  };

  return (
    <AuthContext.Provider
      value={{
        user,
        loading,
        login,
        logout,
        isAuthenticated: !!user,
        hasRole,
        hasAnyRole,
      }}
    >
      {children}
    </AuthContext.Provider>
  );
}

export function useAuth() {
  const context = useContext(AuthContext);
  if (context === undefined) {
    throw new Error('useAuth deve ser usado dentro de um AuthProvider');
  }
  return context;
}