import { useState } from 'react';
import { Bell, BellOff, Loader2, Check } from 'lucide-react';
import { Button } from '@/components/ui/button';
import { LoginArea } from '@/components/auth/LoginArea';
import { useCurrentUser } from '@/hooks/useCurrentUser';
import { useNewsletterSubscription } from '@/hooks/useNewsletterSubscription';
import { useToast } from '@/hooks/useToast';
import { cn } from '@/lib/utils';

/**
 * Opt-in / opt-out of the SkateSpots newsletter mailbox. When subscribed, new
 * issues surface in the notification bell's "News" tab. Logged-out users see a
 * login prompt instead.
 */
export function NewsletterSubscribeButton({ className }: { className?: string }) {
  const { user } = useCurrentUser();
  const { isSubscribed, isLoading, setSubscribed, isUpdating } = useNewsletterSubscription();
  const { toast } = useToast();
  const [justSubscribed, setJustSubscribed] = useState(false);

  if (!user) {
    return (
      <div className={cn('flex flex-col items-center gap-2', className)}>
        <p className="text-xs text-gray-500">Log in with Nostr to get new drops in your mailbox.</p>
        <LoginArea className="max-w-60" />
      </div>
    );
  }

  const handleToggle = async () => {
    try {
      const next = !isSubscribed;
      await setSubscribed(next);
      if (next) {
        setJustSubscribed(true);
        setTimeout(() => setJustSubscribed(false), 2500);
        toast({
          title: "You're subscribed! 🛹",
          description: 'New drops will land in your notification bell under "News".',
        });
      } else {
        toast({
          title: 'Unsubscribed',
          description: 'You can still read every issue here anytime.',
        });
      }
    } catch (err) {
      toast({
        title: 'Something went wrong',
        description: err instanceof Error ? err.message : 'Please try again.',
        variant: 'destructive',
      });
    }
  };

  if (isLoading) {
    return (
      <Button disabled className={cn('gap-2 h-11', className)}>
        <Loader2 className="h-4 w-4 animate-spin" /> Checking…
      </Button>
    );
  }

  if (isSubscribed) {
    return (
      <Button
        onClick={handleToggle}
        disabled={isUpdating}
        variant="outline"
        className={cn(
          'group gap-2 h-11 border-[#ccff00]/50 bg-[#ccff00]/10 font-black uppercase text-xs text-[#ccff00] hover:bg-[#ff0040]/10 hover:border-[#ff0040]/50 hover:text-[#ff0040]',
          className,
        )}
      >
        {isUpdating ? (
          <Loader2 className="h-4 w-4 animate-spin" />
        ) : justSubscribed ? (
          <Check className="h-4 w-4" />
        ) : (
          <>
            <Check className="h-4 w-4 group-hover:hidden" />
            <BellOff className="hidden h-4 w-4 group-hover:block" />
          </>
        )}
        <span className="group-hover:hidden">Subscribed</span>
        <span className="hidden group-hover:inline">Unsubscribe</span>
      </Button>
    );
  }

  return (
    <Button
      onClick={handleToggle}
      disabled={isUpdating}
      className={cn(
        'gap-2 h-11 bg-[#ccff00] font-black uppercase text-xs text-black hover:bg-[#ccff00]/90',
        className,
      )}
    >
      {isUpdating ? <Loader2 className="h-4 w-4 animate-spin" /> : <Bell className="h-4 w-4" />}
      Subscribe to the newsletter
    </Button>
  );
}