import React, { createContext, useContext, useEffect, useState } from 'react';
import { supabase } from '@/db/supabase';
import { User } from '@supabase/supabase-js';
import { Profile } from '@/types/types';

interface AuthContextType {
  user: User | null;
  profile: Profile | null;
  signIn: (email: string, password: string) => Promise<{ error: any }>;
  signUp: (email: string, password: string) => Promise<{ error: any }>;
  signOut: () => Promise<{ error: any }>;
  loading: boolean;
}

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

export const AuthProvider: React.FC<{ children: React.ReactNode }> = ({ children }) => {
  const [user, setUser] = useState<User | null>(null);
  const [profile, setProfile] = useState<Profile | null>(null);
  const [loading, setLoading] = useState(true);

  useEffect(() => {
    // Check active sessions and sets the user
    supabase.auth.getSession().then(({ data: { session } }) => {
      setUser(session?.user ?? null);
      if (session?.user) fetchProfile(session.user.id);
      else setLoading(false);
    });

    // Listen for changes on auth state (sign in, sign out, etc.)
    const { data: { subscription } } = supabase.auth.onAuthStateChange((_event, session) => {
      setUser(session?.user ?? null);
      if (session?.user) fetchProfile(session.user.id);
      else {
        setProfile(null);
        setLoading(false);
      }
    });

    return () => subscription.unsubscribe();
  }, []);

  const fetchProfile = async (uid: string) => {
    try {
      const { data, error } = await supabase
        .from('profiles')
        .select('*')
        .eq('id', uid)
        .maybeSingle();
      
      if (error) throw error;
      setProfile(data);
    } catch (err) {
      console.error('Error fetching profile:', err);
    } finally {
      setLoading(false);
    }
  };

  const signIn = async (email: string, password: string) => {
    return await supabase.auth.signInWithPassword({ email, password });
  };

  const signUp = async (email: string, password: string) => {
    return await supabase.auth.signUp({ email, password });
  };

  const signOut = async () => {
    return await supabase.auth.signOut();
  };

  return (
    <AuthContext.Provider value={{ user, profile, signIn, signUp, signOut, loading }}>
      {children}
    </AuthContext.Provider>
  );
};

export const useAuth = () => {
  const context = useContext(AuthContext);
  if (context === undefined) {
    throw new Error('useAuth must be used within an AuthProvider');
  }
  return context;
};