import { useEffect, useState } from 'react';
import { useAuth } from '@/hooks/useAuth';
import { supabase } from '@/lib/supabaseClient';
import { useNavigate } from 'react-router-dom';
import { toast } from '@/hooks/use-toast';
import { logger } from '@/lib/logger';

export function useBanCheck() {
  const { user } = useAuth();
  const navigate = useNavigate();
  const [isBanned, setIsBanned] = useState(false);
  const [banReason, setBanReason] = useState<string | null>(null);
  const [loading, setLoading] = useState(true);

  useEffect(() => {
    if (!user) {
      setIsBanned(false);
      setLoading(false);
      return;
    }

    const checkBan = async () => {
      try {
        const { data: profile } = await supabase
          .from('profiles')
          .select('banned, ban_reason, ban_expires_at')
          .eq('user_id', user.id)
          .single();

        if (profile?.banned) {
          setIsBanned(true);
          setBanReason(profile.ban_reason || null);
          
          const reason = profile.ban_reason 
            ? `Reason: ${profile.ban_reason}`
            : 'Contact support for assistance.';
          
          // Add expiration info
          let expirationText = '';
          if (profile.ban_expires_at) {
            const expiresAt = new Date(profile.ban_expires_at);
            const now = new Date();
            const daysLeft = Math.ceil((expiresAt.getTime() - now.getTime()) / (1000 * 60 * 60 * 24));
            expirationText = ` This ban will expire in ${daysLeft} day${daysLeft !== 1 ? 's' : ''}.`;
          } else {
            expirationText = ' This is a permanent ban.';
          }
            
          toast({
            title: 'Account Suspended',
            description: `Your account has been suspended. ${reason}${expirationText}`,
            variant: 'destructive',
            duration: Infinity // Don't auto-dismiss
          });
          // Sign out banned user
          await supabase.auth.signOut();
          navigate('/');
        }
      } catch (error) {
        // Silent - ban check failure is non-critical, user proceeds normally
      } finally {
        setLoading(false);
      }
    };

    checkBan();

    // Subscribe to profile changes (real-time ban/unban detection)
    const channel = supabase
      .channel('ban-check')
      .on(
        'postgres_changes',
        {
          event: 'UPDATE',
          schema: 'public',
          table: 'profiles',
          filter: `user_id=eq.${user.id}`
        },
        (payload) => {
          const newProfile = payload.new as { banned: boolean; ban_reason: string | null; ban_expires_at: string | null };
          
          // Handle BAN event
          if (newProfile.banned && !isBanned) {
            setIsBanned(true);
            setBanReason(newProfile.ban_reason || null);
            
            const reason = newProfile.ban_reason 
              ? `Reason: ${newProfile.ban_reason}`
              : 'Contact support for assistance.';
            
            // Add expiration info
            let expirationText = '';
            if (newProfile.ban_expires_at) {
              const expiresAt = new Date(newProfile.ban_expires_at);
              const now = new Date();
              const daysLeft = Math.ceil((expiresAt.getTime() - now.getTime()) / (1000 * 60 * 60 * 24));
              expirationText = ` This ban will expire in ${daysLeft} day${daysLeft !== 1 ? 's' : ''}.`;
            } else {
              expirationText = ' This is a permanent ban.';
            }
              
            toast({
              title: 'Account Suspended',
              description: `Your account has been suspended. ${reason}${expirationText}`,
              variant: 'destructive',
              duration: Infinity
            });
            supabase.auth.signOut();
            navigate('/');
          }
          
          // Handle UNBAN event
          if (!newProfile.banned && isBanned) {
            setIsBanned(false);
            setBanReason(null);
            toast({
              title: 'Account Restored',
              description: 'Your account has been unbanned. You can now use the application normally.',
              variant: 'default',
              duration: 8000
            });
          }
        }
      )
      .subscribe();

    return () => {
      supabase.removeChannel(channel);
    };
  }, [user, navigate]);

  return { isBanned, loading, banReason };
}