import { RSS_API_BASE, RSS_API_TOKEN, WECHAT_APP_ID, WECHAT_APP_SECRET } from "./config";

async function rssFetch<T>(path: string, options?: RequestInit): Promise<T> {
  const url = `${RSS_API_BASE}${path}`;
  const res = await fetch(url, options);
  if (!res.ok) throw new Error(`RSS API error: ${res.status}`);
  return res.json();
}

function withToken(params?: URLSearchParams): string {
  const p = params || new URLSearchParams();
  if (RSS_API_TOKEN) p.set("token", RSS_API_TOKEN);
  return p.toString();
}

// ---- Types ----

export interface Feed {
  url: string;
  feedTitle: string;
  siteUrl?: string;
  error?: string;
}

export interface FeedHealth {
  url: string;
  status: number;
  ok: boolean;
  latency?: number;
  error?: string;
}

export interface Link {
  name: string;
  url: string;
  description?: string;
  image?: string;
  hidden?: boolean;
  rss?: string;
  addedAt?: string;
}

export interface LinkHealth {
  url: string;
  ok: boolean;
  status?: number;
  latency?: number;
  error?: string;
}

export interface Article {
  title: string;
  link: string;
  pubDate: string;
  feedName: string;
  siteUrl: string;
  favicon: string;
  author: string;
}

export interface HealthResult {
  total: number;
  alive: number;
  dead: number;
  results: FeedHealth[];
}

// ---- Feeds API ----

export async function getFeeds(): Promise<Feed[]> {
  const data = await rssFetch<{ feeds: Feed[] }>("/api/feeds");
  return data.feeds || [];
}

export async function addFeed(url: string, feedTitle: string): Promise<void> {
  const qs = withToken();
  await rssFetch(`/api/feeds?${qs}`, {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify({ url, feedTitle }),
  });
}

export async function updateFeed(oldUrl: string, newUrl: string, feedTitle: string): Promise<void> {
  const qs = withToken();
  const body: Record<string, string> = { url: newUrl, feedTitle };
  if (oldUrl && oldUrl !== newUrl) body.oldUrl = oldUrl;
  await rssFetch(`/api/feeds?${qs}`, {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify(body),
  });
}

export async function deleteFeed(url: string): Promise<void> {
  const qs = withToken(new URLSearchParams({ url, token: RSS_API_TOKEN }));
  await rssFetch(`/api/feeds?${qs}`, { method: "DELETE" });
}

export async function getFeedsHealth(): Promise<HealthResult> {
  return rssFetch("/api/health");
}

// ---- Articles API ----

export async function getArticles(limit = 10): Promise<Article[]> {
  const data = await rssFetch<{ articles: Article[] }>(`/api/articles?limit=${limit}`);
  return data.articles || [];
}

// ---- Links API ----

export async function getLinks(all = false): Promise<Link[]> {
  const p = new URLSearchParams();
  if (all) p.set("all", "1");
  const data = await rssFetch<{ links: Link[] }>(`/api/links?${p.toString()}`);
  return data.links || [];
}

export async function addLink(link: { name: string; url: string; description?: string; hidden?: boolean }): Promise<void> {
  const qs = withToken();
  await rssFetch(`/api/links?${qs}`, {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify(link),
  });
}

export async function updateLink(oldUrl: string, data: { name?: string; url?: string; description?: string; hidden?: boolean }): Promise<void> {
  const qs = withToken();
  const body: Record<string, unknown> = { ...data };
  if (data.url && data.url !== oldUrl) body.oldUrl = oldUrl;
  await rssFetch(`/api/links?${qs}`, {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify(body),
  });
}

export async function deleteLink(url: string): Promise<void> {
  const qs = withToken(new URLSearchParams({ url, token: RSS_API_TOKEN }));
  await rssFetch(`/api/links?${qs}`, { method: "DELETE" });
}

// ---- SCF Proxy ----

const SCF_PROXY = process.env.SCF_PROXY || "https://scfapi.usj.cc";

export async function checkLinkHealth(targetUrl: string): Promise<LinkHealth> {
  const start = Date.now();
  try {
    const controller = new AbortController();
    const timer = setTimeout(() => controller.abort(), 12000);
    const res = await fetch(targetUrl, {
      method: "HEAD",
      signal: controller.signal,
      headers: { "User-Agent": "Mozilla/5.0 (compatible; BlogAdmin/1.0)" },
    });
    clearTimeout(timer);
    return { url: targetUrl, ok: res.ok || res.status < 500, status: res.status, latency: Date.now() - start };
  } catch (err: unknown) {
    return { url: targetUrl, ok: false, error: err instanceof Error ? err.message : "timeout", latency: Date.now() - start };
  }
}

export async function checkLinkViaProxy(targetUrl: string): Promise<LinkHealth> {
  const start = Date.now();
  try {
    const res = await fetch(SCF_PROXY, {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({ url: targetUrl, timeout: 12000 }),
    });
    const data = await res.json();
    return {
      url: targetUrl,
      ok: data.ok && (data.status < 500),
      status: data.status,
      latency: Date.now() - start,
      error: data.ok ? undefined : data.error,
    };
  } catch (err: unknown) {
    return { url: targetUrl, ok: false, error: err instanceof Error ? err.message : "proxy error", latency: Date.now() - start };
  }
}

// ---- WeChat Material API ----

export interface WechatArticle {
  title: string;
  thumb_media_url?: string;
  thumb_media_id?: string;
  author?: string;
  digest?: string;
  show_cover_pic?: number;
  content: string;
  content_source_url?: string;
  content_image_urls?: { original_url: string }[];
  need_open_comment?: number;
  only_fans_can_comment?: number;
}

export async function getWechatStatus(): Promise<{ configured: boolean; appId?: string }> {
  const data = await rssFetch<{ configured: boolean; appId?: string }>("/api/wechat-material");
  return data;
}

export async function syncWechat(articles: Record<string, unknown>[]): Promise<{ ok: boolean; media_id?: string; message?: string }> {
  const qs = withToken();
  const body: Record<string, unknown> = { articles };
  if (WECHAT_APP_ID) body.appId = WECHAT_APP_ID;
  if (WECHAT_APP_SECRET) body.appSecret = WECHAT_APP_SECRET;
  const res = await fetch(`${RSS_API_BASE}/api/wechat-material?${qs}`, {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify(body),
  });
  const data = await res.json();
  if (!res.ok || !data.ok) {
    throw new Error(data.error || data.message || `WeChat API error: ${res.status}`);
  }
  return data;
}