import { createContext, useContext, useState, useEffect, ReactNode } from 'react';
import { supabase } from '@/integrations/supabase/client';
import { Session, User } from '@supabase/supabase-js';
import { useToast } from '@/hooks/use-toast';

type Provider = 'github' | 'google' | 'microsoft';

type AuthContextType = {
  session: Session | null;
  user: User | null;
  profile: any | null;
  loading: boolean;
  signIn: (email: string, password: string) => Promise<void>;
  signUp: (email: string, password: string, fullName: string) => Promise<void>;
  signOut: () => Promise<void>;
  signInWithProvider: (provider: Provider) => Promise<void>;
};

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

export const AuthProvider = ({ children }: { children: ReactNode }) => {
  const [session, setSession] = useState<Session | null>(null);
  const [user, setUser] = useState<User | null>(null);
  const [profile, setProfile] = useState<any | null>(null);
  const [loading, setLoading] = useState(true);
  const { toast } = useToast();

  useEffect(() => {
    // Get the initial session
    supabase.auth.getSession().then(({ data: { session } }) => {
      setSession(session);
      setUser(session?.user ?? null);
      if (session?.user) {
        fetchProfile(session.user.id);
      }
      setLoading(false);
    });

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

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

  const fetchProfile = async (userId: string) => {
    try {
      const { data, error } = await supabase
        .from('profiles')
        .select('*')
        .eq('id', userId)
        .single();

      if (error) {
        console.error('Error fetching profile:', error);
        return;
      }

      setProfile(data);
    } catch (error) {
      console.error('Error fetching profile:', error);
    }
  };

  const signIn = async (email: string, password: string) => {
    try {
      setLoading(true);
      const { error } = await supabase.auth.signInWithPassword({ email, password });
      
      if (error) throw error;
      
      toast({
        title: "Success!",
        description: "You are now signed in.",
      });
    } catch (error: any) {
      toast({
        title: "Error signing in",
        description: error.message,
        variant: "destructive",
      });
      console.error('Error signing in:', error);
      throw error;
    } finally {
      setLoading(false);
    }
  };

  const signUp = async (email: string, password: string, fullName: string) => {
    try {
      setLoading(true);
      const { error } = await supabase.auth.signUp({ 
        email, 
        password,
        options: {
          data: {
            full_name: fullName,
          }
        }
      });
      
      if (error) throw error;
      
      toast({
        title: "Account created!",
        description: "Please check your email to confirm your account.",
      });
    } catch (error: any) {
      toast({
        title: "Error creating account",
        description: error.message,
        variant: "destructive",
      });
      console.error('Error signing up:', error);
      throw error;
    } finally {
      setLoading(false);
    }
  };

  const signInWithProvider = async (provider: Provider) => {
    try {
      setLoading(true);
      const { error } = await supabase.auth.signInWithOAuth({
        provider,
        options: {
          redirectTo: window.location.origin + '/dashboard',
        },
      });
      
      if (error) throw error;
      
      toast({
        title: "Redirecting...",
        description: `Signing in with ${provider}`,
      });
    } catch (error: any) {
      toast({
        title: `Error signing in with ${provider}`,
        description: error.message,
        variant: "destructive",
      });
      console.error(`Error signing in with ${provider}:`, error);
      setLoading(false);
    }
  };

  const signOut = async () => {
    try {
      setLoading(true);
      const { error } = await supabase.auth.signOut();
      if (error) throw error;
      toast({
        title: "Signed out",
        description: "You have been successfully signed out.",
      });
    } catch (error: any) {
      toast({
        title: "Error signing out",
        description: error.message,
        variant: "destructive",
      });
      console.error('Error signing out:', error);
    } finally {
      setLoading(false);
    }
  };

  return (
    <AuthContext.Provider
      value={{
        session,
        user,
        profile,
        loading,
        signIn,
        signUp,
        signOut,
        signInWithProvider,
      }}
    >
      {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;
};