import { useState, type ReactNode } from 'react';
import { useNavigate } from 'react-router-dom';
import { Trash2, Loader2, AlertTriangle } from 'lucide-react';
import { Button } from '@/components/ui/button';
import {
  AlertDialog,
  AlertDialogContent,
  AlertDialogDescription,
  AlertDialogFooter,
  AlertDialogHeader,
  AlertDialogTitle,
} from '@/components/ui/alert-dialog';
import { useDeleteEntity } from '@/hooks/useDeleteEntity';
import { useCurrentUser } from '@/hooks/useCurrentUser';
import { useToast } from '@/hooks/useToast';
import { isAdminPubkey } from '@/lib/admins';
import { cn } from '@/lib/utils';
import type { NostrEvent } from '@nostrify/nostrify';

interface DeleteEntityDialogProps {
  /** The addressable event to delete (crew, Lab profile, spot, …). */
  event: NostrEvent;
  /** Human label for the thing being deleted, e.g. "crew" or "coach profile". */
  entityLabel: string;
  /** The name/title shown in the confirmation copy. */
  entityName: string;
  /** Where to send the user after a successful delete (e.g. "/crews"). */
  redirectTo?: string;
  /** Verb shown on the trigger button (default "Delete"). */
  triggerText?: string;
  /** Optional custom trigger. If omitted a default outline button is rendered. */
  trigger?: ReactNode;
  /** Extra classes for the default trigger button. */
  className?: string;
}

/**
 * Reusable "delete / dissolve" control for any addressable event the current
 * user owns. Publishes a NIP-09 deletion request (see useDeleteEntity) after an
 * explicit confirmation, and is only rendered for the owner.
 */
export function DeleteEntityDialog({
  event,
  entityLabel,
  entityName,
  redirectTo,
  triggerText = 'Delete',
  trigger,
  className,
}: DeleteEntityDialogProps) {
  const { user } = useCurrentUser();
  const { mutateAsync: deleteEntity, isPending } = useDeleteEntity();
  const { toast } = useToast();
  const navigate = useNavigate();
  const [open, setOpen] = useState(false);

  if (!user) return null;

  const isOwner = user.pubkey === event.pubkey;
  const isAdmin = isAdminPubkey(user.pubkey);
  // The owner can delete their own event; a SkateSpots admin can take down any.
  if (!isOwner && !isAdmin) return null;

  // An admin acting on someone else's content is a moderation takedown.
  const adminTakedown = isAdmin && !isOwner;

  const handleDelete = async () => {
    try {
      await deleteEntity({
        event,
        reason: adminTakedown
          ? `SkateSpots admin removed ${entityLabel} "${entityName}"`
          : `Deleted ${entityLabel} "${entityName}"`,
      });
      toast({
        title: adminTakedown ? 'Content removed' : 'Deletion requested',
        description: adminTakedown
          ? `This ${entityLabel} has been taken down and will be hidden across SkateSpots.`
          : `Your ${entityLabel} has been removed. Relays that honor deletions will stop serving it.`,
      });
      setOpen(false);
      if (redirectTo) navigate(redirectTo);
    } catch (error) {
      toast({
        title: 'Delete failed',
        description: error instanceof Error ? error.message : 'Something went wrong',
        variant: 'destructive',
      });
    }
  };

  return (
    <>
      {trigger ? (
        <span onClick={() => setOpen(true)}>{trigger}</span>
      ) : (
        <Button
          type="button"
          variant="outline"
          size="sm"
          onClick={() => setOpen(true)}
          className={cn(
            'gap-1.5 border-red-500/40 text-red-400 hover:bg-red-500/10 hover:text-red-300',
            className,
          )}
        >
          <Trash2 className="h-3.5 w-3.5" /> {adminTakedown ? `Remove (admin)` : triggerText}
        </Button>
      )}

      <AlertDialog open={open} onOpenChange={setOpen}>
        <AlertDialogContent>
          <AlertDialogHeader>
            <AlertDialogTitle className="flex items-center gap-2">
              <Trash2 className="h-5 w-5 text-red-500" />
              Delete "{entityName}"?
            </AlertDialogTitle>
            <AlertDialogDescription asChild>
              <div className="space-y-3">
                {adminTakedown ? (
                  <p>
                    As a SkateSpots admin you’re taking down this {entityLabel}. It will be hidden
                    across the app for everyone and a deletion request will be sent to relays. The
                    original author can’t restore it from here.
                  </p>
                ) : (
                  <p>
                    This asks relays to remove your {entityLabel}. This can’t be undone from here — you’d
                    have to create a new one.
                  </p>
                )}
                <div className="flex gap-2 rounded-lg border border-yellow-500/30 bg-yellow-500/10 p-3 text-sm">
                  <AlertTriangle className="mt-0.5 h-4 w-4 flex-shrink-0 text-yellow-500" />
                  <p className="text-yellow-400/90">
                    Nostr is decentralized, so deletion is best-effort: relays that honor NIP-09 will
                    drop it, but a relay that doesn’t may keep a copy. SkateSpots hides admin-removed
                    content in the app regardless.
                  </p>
                </div>
              </div>
            </AlertDialogDescription>
          </AlertDialogHeader>
          <AlertDialogFooter>
            <Button variant="outline" onClick={() => setOpen(false)} disabled={isPending}>
              Cancel
            </Button>
            <Button
              onClick={handleDelete}
              disabled={isPending}
              className="bg-red-500 text-white hover:bg-red-600"
            >
              {isPending ? (
                <>
                  <Loader2 className="mr-2 h-4 w-4 animate-spin" />
                  Deleting…
                </>
              ) : (
                <>
                  <Trash2 className="mr-2 h-4 w-4" />
                  {triggerText}
                </>
              )}
            </Button>
          </AlertDialogFooter>
        </AlertDialogContent>
      </AlertDialog>
    </>
  );
}