import { useState } from 'react';
import {
  Dialog,
  DialogContent,
  DialogDescription,
  DialogFooter,
  DialogHeader,
  DialogTitle,
  DialogTrigger,
} from '@/components/ui/dialog';
import { Button } from '@/components/ui/button';
import { Textarea } from '@/components/ui/textarea';
import { useCurrentUser } from '@/hooks/useCurrentUser';
import { useNostrLogin } from '@nostrify/react/login';
import { useSendDirectMessage } from '@/hooks/useDirectMessages';
import { useToast } from '@/hooks/useToast';
import { hasNip44 as checkNip44 } from '@/lib/signerCapabilities';
import { UserPlus, Loader2, Lock } from 'lucide-react';

interface CrewRequestToJoinProps {
  crewName: string;
  founderPubkey: string;
  /** Delegated admins — they also receive the request so growth isn't founder-only. */
  admins?: string[];
}

/**
 * Lets a skater request to join a crew via an encrypted NIP-17 DM to the
 * founder and admins. This removes the founder-push-only bottleneck: anyone can
 * knock, and any admin can then add them from the crew editor.
 *
 * Privacy: the request is a gift-wrapped DM (kinds 14/13/1059) — only the
 * recipients can read it. No public "join" event leaks the social graph.
 */
export function CrewRequestToJoin({ crewName, founderPubkey, admins = [] }: CrewRequestToJoinProps) {
  const { user } = useCurrentUser();
  const { logins } = useNostrLogin();
  const { mutateAsync: sendMessage, isPending } = useSendDirectMessage();
  const { toast } = useToast();
  const [open, setOpen] = useState(false);
  const [note, setNote] = useState('');

  if (!user) return null;

  const recipients = Array.from(new Set([founderPubkey, ...admins])).filter(
    (pk) => pk !== user.pubkey,
  );

  // Don't show for people already in the leadership.
  if (recipients.length === 0) return null;

  const canDM = checkNip44(user, logins);

  const handleSend = async () => {
    if (!canDM) {
      toast({
        title: 'Encryption unavailable',
        description: 'Your signer does not support NIP-44 encryption. Please upgrade your extension.',
        variant: 'destructive',
      });
      return;
    }
    try {
      const body =
        `🛹 Request to join ${crewName}` +
        (note.trim() ? `\n\n${note.trim()}` : '\n\nWould love to roll with the crew.');
      await sendMessage({
        recipients,
        content: body,
        subject: `${crewName} — join request`,
      });
      toast({
        title: 'Request sent!',
        description: `The ${crewName} crew leadership got your encrypted message.`,
      });
      setOpen(false);
      setNote('');
    } catch (err) {
      toast({
        title: 'Could not send request',
        description: err instanceof Error ? err.message : 'Please try again.',
        variant: 'destructive',
      });
    }
  };

  return (
    <Dialog open={open} onOpenChange={setOpen}>
      <DialogTrigger asChild>
        <Button
          variant="outline"
          size="sm"
          className="gap-1.5 border-teal-500/40 text-teal-400 hover:bg-teal-500/10"
        >
          <UserPlus className="h-3.5 w-3.5" /> Request to join
        </Button>
      </DialogTrigger>
      <DialogContent className="max-w-md">
        <DialogHeader>
          <DialogTitle className="flex items-center gap-2">
            <UserPlus className="h-5 w-5 text-teal-400" /> Join {crewName}
          </DialogTitle>
          <DialogDescription className="flex items-center gap-1.5">
            <Lock className="h-3 w-3 text-teal-400" />
            Sends a private, encrypted message to the crew's founder &amp; admins.
          </DialogDescription>
        </DialogHeader>
        <Textarea
          value={note}
          onChange={(e) => setNote(e.target.value)}
          placeholder="Say hi — where you skate, who you know, why you want in…"
          rows={4}
          maxLength={1000}
          className="resize-none"
        />
        <DialogFooter>
          <Button
            onClick={handleSend}
            disabled={isPending}
            className="w-full bg-teal-500 font-bold text-black hover:bg-teal-600"
          >
            {isPending ? (
              <>
                <Loader2 className="mr-2 h-4 w-4 animate-spin" /> Sending…
              </>
            ) : (
              <>
                <UserPlus className="mr-2 h-4 w-4" /> Send join request
              </>
            )}
          </Button>
        </DialogFooter>
      </DialogContent>
    </Dialog>
  );
}