import { useQuery } from '@tanstack/react-query';
import { CapacitorHttp } from '@capacitor/core';
import { isNativePlatform } from '@/lib/platform';

/**
 * A mint from the MintRadar community directory (https://mintradar.org).
 *
 * MintRadar sends no CORS headers, so on the WEB we fetch it **same-origin** at
 * `/api/mints/*` — Netlify proxies it in prod (see `public/_redirects`) and the
 * Vite proxy does in dev.
 *
 * On the NATIVE app the shell is served from `https://localhost`, so a relative
 * `/api/...` path hits the **local asset server** and gets `index.html` back —
 * which blew up as `Unexpected token '<' … is not valid JSON` on the Mints page.
 * So native goes to the real site with Capacitor's native HTTP, which also
 * bypasses WebView CORS (MintRadar has none).
 *
 * The data is unofficial, rate-limited and may change without notice — treat it
 * as a hint, not gospel.
 */
export interface MintDirectoryEntry {
  url: string;
  name?: string;
  iconUrl?: string;
  descriptionLong?: string;
  online?: boolean;
  degraded?: boolean;
  archived?: boolean;
  latencyMs?: number;
  version?: string;
  nutCount?: number;
  tosUrl?: string;
  lastOnlineAt?: string;

  // ── Community signal MintRadar also returns (previously unused) ────────────
  /** Average community rating, 0–5. */
  reviewAvgRating?: number;
  /** How many community ratings back the average. */
  reviewCount?: number;
  /** Rating after MintRadar's own weighting. */
  reviewWeightedRating?: number;
  /** 0–100 composite reliability score. */
  reliabilityScore?: number;
  uptimePct24h?: number;
  uptimePct7d?: number;
  /** Liveness audit volume — tokens actually minted/melted through it. */
  auditNMints?: number;
  auditNMelts?: number;
  auditNErrors?: number;
  auditRecentErrors?: number;
  auditRecentTotal?: number;
  auditCheckedAt?: string;
  serverLocation?: string;
  units?: string[];
  mintMethods?: Array<{ unit?: string; method?: string; min_amount?: number; max_amount?: number }>;
  meltMethods?: Array<{ unit?: string; method?: string; min_amount?: number; max_amount?: number }>;
  /** The mint's own Nostr announcement key, when it publishes one. */
  pubkey?: string;
  nostrAnnouncedAt?: string;
  discoveredAt?: string;
  lastError?: string | null;
}

const SITE_ORIGIN = 'https://skate-spots.org';
const DIRECTORY_PATH = '/api/mints/known';
const UNAVAILABLE = 'The mint directory is unavailable right now.';

/** Parse a JSON body, turning an HTML page into a friendly error. */
function parseDirectory(text: string): unknown {
  const trimmed = text.trim();
  if (trimmed.startsWith('<')) {
    // An HTML page (SPA fallback or an upstream error) — never surface a raw
    // "Unexpected token '<'" to the user.
    throw new Error(UNAVAILABLE);
  }
  try {
    return JSON.parse(trimmed);
  } catch {
    throw new Error('Unexpected mint directory response.');
  }
}

function normalize(data: unknown): MintDirectoryEntry[] {
  if (!Array.isArray(data)) throw new Error('Unexpected mint directory response.');
  return (data as MintDirectoryEntry[]).filter(
    (m) => m && typeof m.url === 'string' && m.url.length > 0,
  );
}

async function loadDirectory(signal: AbortSignal): Promise<MintDirectoryEntry[]> {
  // Web / dev: relative URL → same-origin proxy.
  if (!isNativePlatform()) {
    const res = await fetch(DIRECTORY_PATH, {
      signal,
      headers: { accept: 'application/json' },
    });
    if (!res.ok) throw new Error(`The mint directory is unavailable right now (HTTP ${res.status}).`);
    return normalize(parseDirectory(await res.text()));
  }

  const absolute = `${SITE_ORIGIN}${DIRECTORY_PATH}`;

  // Native: Capacitor's HTTP plugin (no CORS restrictions).
  try {
    const res = await CapacitorHttp.request({
      url: absolute,
      method: 'GET',
      headers: { accept: 'application/json' },
      connectTimeout: 15000,
      readTimeout: 15000,
    });
    if (res.status >= 200 && res.status < 300) {
      // CapacitorHttp parses JSON for us; a non-JSON body arrives as a string.
      const raw: unknown = typeof res.data === 'string' ? parseDirectory(res.data) : res.data;
      return normalize(raw);
    }
    console.warn('[mints] native HTTP returned', res.status);
  } catch (e) {
    console.warn('[mints] native HTTP failed:', e);
  }

  // Fallback: a plain fetch to the absolute URL (works on CORS-free WebViews).
  const res = await fetch(absolute, { signal, headers: { accept: 'application/json' } });
  if (!res.ok) throw new Error(`The mint directory is unavailable right now (HTTP ${res.status}).`);
  return normalize(parseDirectory(await res.text()));
}

export function useMintDirectory() {
  return useQuery<MintDirectoryEntry[]>({
    queryKey: ['mint-directory'],
    staleTime: 10 * 60 * 1000,
    retry: 1,
    queryFn: (c) => loadDirectory(AbortSignal.any([c.signal, AbortSignal.timeout(20000)])),
  });
}