"use client";

import Image from "next/image";
import { useNostrProfile } from "@/hooks/useNostrProfile";
import type { NostrProfile } from "@/lib/nostr";

function computeInitials(profile: NostrProfile | null, fallback?: string): string {
  const name = profile?.name || profile?.displayName;
  if (name?.trim()) return name.trim().slice(0, 2).toUpperCase();
  const fb = fallback?.trim();
  if (fb) {
    // For npub-style fallbacks skip the "npub1" prefix for nicer initials.
    if (fb.startsWith("npub1") && fb.length >= 8) return fb.slice(5, 7).toUpperCase();
    return fb.slice(0, 2).toUpperCase();
  }
  return "?";
}

export interface NostrAvatarProps {
  pubkey: string | null | undefined;
  /** Rendered size in pixels (square). */
  size?: number;
  /** Text used to derive initials when no Nostr name/picture is available. */
  fallbackText?: string;
  className?: string;
}

// Self-contained avatar: fetches the user's Nostr metadata from relays and
// renders their profile picture, falling back to initials.
export function NostrAvatar({
  pubkey,
  size = 56,
  fallbackText,
  className = "",
}: NostrAvatarProps) {
  const { profile, loading } = useNostrProfile(pubkey);
  const displayName = profile?.name || profile?.displayName;

  return (
    <div
      className={`shrink-0 rounded-full bg-surface-container-high flex items-center justify-center overflow-hidden text-on-surface ${className}`}
      style={{ width: size, height: size }}
    >
      {loading ? (
        <span className="text-on-surface/40 text-xs">…</span>
      ) : profile?.picture ? (
        <Image
          src={profile.picture}
          alt={displayName ? `Avatar: ${displayName}` : "Nostr profile picture"}
          width={size}
          height={size}
          className="object-cover w-full h-full"
          unoptimized
        />
      ) : (
        <span className="font-semibold text-sm" aria-hidden>
          {computeInitials(profile, fallbackText)}
        </span>
      )}
    </div>
  );
}