/**
 * Profile badges — the small logos/chips on a profile.
 *
 * Two sources:
 *   1. The built-in **SkateSpots** badge: any handle issued by our own domain
 *      (`name@skate-spots.org`) earns the app-logo badge, linking to the site.
 *      Derived — never stored — so it works for every existing user.
 *   2. User badges: a `badges` array in the kind-0 metadata
 *      (`{ label, url? }`), e.g. sponsors a skater represents. Clicking one opens
 *      the link the skater chose.
 *
 * Back-compat: the old `sponsors` newline-string is carried forward as
 * label-only badges, so nothing disappears for people who set it before.
 */

import type { NostrMetadata } from '@nostrify/nostrify';

export interface ProfileBadge {
  label: string;
  /** Optional link the badge opens. */
  url?: string;
}

export const SKATESPOTS_SITE = 'https://skate-spots.org/';

/** The app badge every `@skate-spots.org` handle earns (logo → the site). */
export const SKATESPOTS_BADGE: ProfileBadge = {
  label: 'SkateSpots',
  url: SKATESPOTS_SITE,
};

/** True when a handle is issued by our own domain. */
export function isSkateSpotsNip05(nip05?: string | null): boolean {
  return !!nip05 && nip05.trim().toLowerCase().endsWith('@skate-spots.org');
}

/** A safe external link, or undefined. */
function safeUrl(value: unknown): string | undefined {
  if (typeof value !== 'string') return undefined;
  const url = value.trim();
  return /^https?:\/\//i.test(url) ? url : undefined;
}

/** Parse the profile's own badges from kind-0 metadata (defensive). */
export function parseBadges(metadata: NostrMetadata | undefined): ProfileBadge[] {
  const raw = metadata as (NostrMetadata & Record<string, unknown>) | undefined;
  const out: ProfileBadge[] = [];

  if (Array.isArray(raw?.badges)) {
    for (const entry of raw.badges) {
      if (!entry || typeof entry !== 'object') continue;
      const { label, url } = entry as Record<string, unknown>;
      if (typeof label !== 'string' || !label.trim()) continue;
      out.push({ label: label.trim().slice(0, 40), url: safeUrl(url) });
      if (out.length >= 12) break;
    }
  }

  // Legacy `sponsors` (newline-separated) → label-only badges.
  if (typeof raw?.sponsors === 'string') {
    for (const line of raw.sponsors.split('\n')) {
      const label = line.trim();
      if (!label || out.some((b) => b.label === label)) continue;
      out.push({ label: label.slice(0, 40) });
      if (out.length >= 12) break;
    }
  }

  return out;
}

/** The badges to render for a profile: the app badge first, then the user's own. */
export function profileBadges(metadata: NostrMetadata | undefined): ProfileBadge[] {
  const own = parseBadges(metadata);
  const nip05 = (metadata as { nip05?: string } | undefined)?.nip05;
  return isSkateSpotsNip05(nip05) ? [SKATESPOTS_BADGE, ...own] : own;
}