/**
 * Cloudflare API 抓包桩(仅测试用):
 * 拦截 globalThis.fetch,对 dash.cloudflare.com / api.cloudflare.com 返回固定响应,
 * 并记录真实发出的 HTTP 调用。生产代码里没有任何模拟实现——接入链路跑的始终是
 * RealCFApi,测试只是在传输层把它要访问的 Cloudflare 换成本地桩。
 */

/** # 成员变量: 记录到的 Cloudflare API 调用 **/
export interface CfCall {
  /** 请求方法 **/
  method: string;
  /** 完整 URL **/
  url: string;
  /** 路径(去掉 base) **/
  path: string;
  /** Authorization 头(OAuth Bearer token) **/
  authorization: string | null;
  /** 请求体文本(URL 编码或 JSON);multipart 上传记 null **/
  body: string | null;
}

/** # 成员变量: 桩的返回数据配置 **/
export interface CfMockOptions {
  /** /accounts 返回的账户列表 **/
  accounts?: { id: string; name: string }[];
  /** /zones 返回的域名列表 **/
  zones?: { id: string; name: string; account_id: string; status: string }[];
  /** OAuth token 端点签发的 access token **/
  accessToken?: string;
  /** token 端点 HTTP 状态(测失败分支用) **/
  tokenStatus?: number;
}

/** # 成员变量: Cloudflare API 桩句柄 **/
export interface CfMock {
  /** 已记录的调用 **/
  calls: CfCall[];
  /** 恢复原始 fetch **/
  restore(): void;
  /** 是否发生过指定 method + 路径子串的调用 **/
  hit(method: string, pathPart: string): boolean;
  /** 取出第一条匹配调用的 body **/
  bodyOf(method: string, pathPart: string): string | null;
}

const TOKEN_URL = "https://dash.cloudflare.com/oauth2/token";
const API_BASE = "https://api.cloudflare.com/client/v4";

/** # 函数
 * 安装 Cloudflare API 桩:接管 globalThis.fetch,返回记录与恢复句柄
 * 参数: opts.accounts/zones 决定发现到的资源,tokenStatus 可模拟 token 兑换失败
 */
export function installCloudflareMock(opts: CfMockOptions = {}): CfMock {
  const accounts = opts.accounts ?? [{ id: "cf-acct-real-1", name: "Real Cloudflare Account" }];
  const zones = opts.zones ?? [
    { id: "zone-example", name: "example.com", account_id: accounts[0]?.id ?? "", status: "active" },
    { id: "zone-demo", name: "demo.com", account_id: accounts[0]?.id ?? "", status: "active" },
  ];
  const accessToken = opts.accessToken ?? "cf-oauth-access-token-xyz";
  const calls: CfCall[] = [];
  const original = globalThis.fetch;

  globalThis.fetch = (async (input: RequestInfo | URL, init?: RequestInit): Promise<Response> => {
    const url = typeof input === "string" ? input : input instanceof URL ? input.toString() : input.url;
    const method = (init?.method ?? (input instanceof Request ? input.method : "GET")).toUpperCase();
    const headers = new Headers(
      init?.headers ?? (input instanceof Request ? input.headers : undefined),
    );
    const rawBody = init?.body;
    const body =
      typeof rawBody === "string"
        ? rawBody
        : rawBody instanceof URLSearchParams
          ? rawBody.toString()
          : null;

    calls.push({
      method,
      url,
      path: url.startsWith(API_BASE) ? url.slice(API_BASE.length) : url,
      authorization: headers.get("authorization"),
      // multipart 上传(Email Worker 脚本)读不出文本,只记方法与路径
      body: rawBody instanceof FormData ? null : body,
    });

    const json = (result: unknown, status = 200) =>
      new Response(JSON.stringify({ success: true, errors: [], messages: [], result }), {
        status,
        headers: { "Content-Type": "application/json" },
      });

    if (url === TOKEN_URL) {
      if ((opts.tokenStatus ?? 200) !== 200) {
        return new Response(JSON.stringify({ error: "invalid_grant" }), { status: opts.tokenStatus });
      }
      // OAuth token 端点是裸 JSON(不是 Cloudflare API 的 {success,result} 信封)
      return new Response(JSON.stringify({ access_token: accessToken, expires_in: 3600, token_type: "bearer" }), {
        status: 200,
        headers: { "Content-Type": "application/json" },
      });
    }
    if (url.startsWith(`${API_BASE}/accounts`)) return json(accounts);
    if (url.startsWith(`${API_BASE}/zones`)) {
      if (url.includes("/email/routing/rules/catch_all")) return json({ id: "catch-all-rule" });
      if (url.includes("/email/routing")) return json({ enabled: true });
      return json(zones);
    }
    if (url.includes("/workers/scripts/")) return json({ id: url.split("/").pop() });
    return json(null, 404);
  }) as typeof globalThis.fetch;

  return {
    calls,
    restore: () => {
      globalThis.fetch = original;
    },
    hit: (method, pathPart) =>
      calls.some((c) => c.method === method.toUpperCase() && c.path.includes(pathPart)),
    bodyOf: (method, pathPart) =>
      calls.find((c) => c.method === method.toUpperCase() && c.path.includes(pathPart))?.body ?? null,
  };
}