/** 测试辅助(非公开 API):构造适配器、在 mock fetch 前挂二进制 .torrent 路由。 */
import { buildFakeTorrent } from "@umt/testkit";
import { createSiteRateLimiter } from "../rate-limit.ts";
import { type SiteAdapter, type SiteCredentialKind, SiteError, staticSecretResolver } from "../types.ts";
import { createSpecializedSiteAdapter } from "./adapter.ts";
import type { SpecializedSiteDefinition, SpecializedSpider } from "./types.ts";

export function testDef(
  parser: SpecializedSiteDefinition["parser"],
  over: Partial<SpecializedSiteDefinition> = {},
): SpecializedSiteDefinition {
  return {
    id: "demo",
    name: "Demo",
    domain: "https://pt.example.com/",
    parser,
    ...over,
    umt: {
      version: "demo@0.0.0-test",
      kind: "api",
      displayName: "Demo",
      timezone: "+08:00",
      rateLimit: { minIntervalMs: 0, burst: 10 },
      capabilities: { list: true, search: true, detail: false, download: true, rss: false },
      ...(over.umt ?? {}),
    },
  };
}

export function adapterWith(
  def: SpecializedSiteDefinition,
  spider: SpecializedSpider,
  fetchImpl: typeof globalThis.fetch,
  secrets: Partial<Record<SiteCredentialKind, string>> = { cookie: "c=COOKIESECRET", apiKey: "APIKEYSECRET" },
): SiteAdapter {
  return createSpecializedSiteAdapter(def, spider, {
    fetch: fetchImpl,
    secrets: staticSecretResolver({ [def.id]: secrets }),
    limiter: createSiteRateLimiter({ minIntervalMs: 0 }),
  });
}

/** 包一层 fetch:命中 predicate 的请求返回合法 .torrent 字节 */
export function withTorrent(
  inner: typeof globalThis.fetch,
  predicate: (url: URL) => boolean,
  name = "demo",
): { fetch: typeof globalThis.fetch; infoHash: string; hits: Array<{ url: URL; headers: Headers }> } {
  const t = buildFakeTorrent({ name });
  const hits: Array<{ url: URL; headers: Headers }> = [];
  const f = (async (input: string | URL | Request, init?: RequestInit) => {
    const url = new URL(typeof input === "string" ? input : input instanceof URL ? input.href : input.url);
    if (predicate(url)) {
      hits.push({ url, headers: new Headers(init?.headers) });
      return new Response(t.bytes as Uint8Array<ArrayBuffer>, {
        status: 200,
        headers: { "content-type": "application/x-bittorrent" },
      });
    }
    return inner(input, init);
  }) as typeof globalThis.fetch;
  return { fetch: f, infoHash: t.infoHash, hits };
}

export async function expectSiteError(p: Promise<unknown>, kind: string): Promise<SiteError> {
  try {
    await p;
  } catch (e) {
    if (!(e instanceof SiteError)) throw e;
    if (e.kind !== kind) throw new Error(`expected SiteError ${kind}, got ${e.kind}: ${e.message}`);
    return e;
  }
  throw new Error(`expected SiteError ${kind}`);
}