import { useState } from 'react';
import { Button } from '@/components/ui/button';
import { AlertDialog, AlertDialogAction, AlertDialogCancel, AlertDialogContent, AlertDialogDescription, AlertDialogFooter, AlertDialogHeader, AlertDialogTitle, AlertDialogTrigger } from '@/components/ui/alert-dialog';
import { Input } from '@/components/ui/input';
import { Label } from '@/components/ui/label';
import { UserX } from 'lucide-react';
import { supabase } from '@/integrations/supabase/client';
import { useAuth } from '@/hooks/useAuth';
import { useToast } from '@/hooks/use-toast';

interface UserBlockButtonProps {
  targetUserId: string;
  targetUsername: string;
  variant?: 'default' | 'outline' | 'ghost';
  size?: 'default' | 'sm' | 'lg';
}

export function UserBlockButton({ targetUserId, targetUsername, variant = 'outline', size = 'sm' }: UserBlockButtonProps) {
  const { user } = useAuth();
  const { toast } = useToast();
  const [reason, setReason] = useState('');
  const [loading, setLoading] = useState(false);

  const handleBlock = async () => {
    if (!user) return;

    setLoading(true);
    try {
      const { error } = await supabase
        .from('user_blocks')
        .insert({
          blocker_id: user.id,
          blocked_id: targetUserId,
          reason: reason.trim() || null
        });

      if (error) throw error;

      toast({
        title: 'User blocked',
        description: `You have blocked @${targetUsername}. They will no longer be able to interact with your content.`
      });

      setReason('');
    } catch (error: any) {
      console.error('Error blocking user:', error);
      toast({
        title: 'Error',
        description: 'Failed to block user',
        variant: 'destructive'
      });
    } finally {
      setLoading(false);
    }
  };

  // Don't show block button if user is not logged in or trying to block themselves
  if (!user || user.id === targetUserId) {
    return null;
  }

  return (
    <AlertDialog>
      <AlertDialogTrigger asChild>
        <Button variant={variant} size={size}>
          <UserX className="w-4 h-4 mr-2" />
          Block User
        </Button>
      </AlertDialogTrigger>
      <AlertDialogContent>
        <AlertDialogHeader>
          <AlertDialogTitle>Block @{targetUsername}</AlertDialogTitle>
          <AlertDialogDescription>
            This user will no longer be able to see your content or interact with you. 
            You can unblock them at any time from your privacy settings.
          </AlertDialogDescription>
        </AlertDialogHeader>
        
        <div className="space-y-2">
          <Label htmlFor="reason">Reason (optional)</Label>
          <Input
            id="reason"
            placeholder="Why are you blocking this user?"
            value={reason}
            onChange={(e) => setReason(e.target.value)}
            maxLength={200}
          />
        </div>

        <AlertDialogFooter>
          <AlertDialogCancel>Cancel</AlertDialogCancel>
          <AlertDialogAction 
            onClick={handleBlock}
            disabled={loading}
            className="bg-destructive hover:bg-destructive/90"
          >
            {loading ? 'Blocking...' : 'Block User'}
          </AlertDialogAction>
        </AlertDialogFooter>
      </AlertDialogContent>
    </AlertDialog>
  );
}