/**
 * This file can be directly run
 *
 *  PACKAGE_DIR_TO_USE=(realpath .) bun test/cli/install/dummy.registry.ts
 */
import { file, Server } from "bun";

var expect: typeof import("bun:test")["expect"];

import { mkdtemp, readdir, realpath, rm, writeFile } from "fs/promises";
import { tmpdir } from "os";
import { basename, join } from "path";

type RequestHandler = (request: Request) => Response | Promise<Response>;
let handler: RequestHandler, server: Server;
export let package_dir: string, requested: number, root_url: string;
let testCounter = 0;
export function dummyRegistry(urls: string[], info: any = { "0.0.2": {} }): RequestHandler {
  return async request => {
    urls.push(request.url);
    expect(request.method).toBe("GET");
    if (request.url.endsWith(".tgz")) {
      return new Response(file(join(import.meta.dir, basename(request.url).toLowerCase())));
    }
    expect(request.headers.get("accept")).toBe(
      "application/vnd.npm.install-v1+json; q=1.0, application/json; q=0.8, */*",
    );
    expect(request.headers.get("npm-auth-type")).toBe(null);
    expect(await request.text()).toBe("");
    const name = request.url.slice(request.url.indexOf("/", root_url.length) + 1);
    const versions: any = {};
    let version;
    for (version in info) {
      if (!/^[0-9]/.test(version)) continue;
      versions[version] = {
        name,
        version,
        dist: {
          tarball: `${request.url}-${info[version].as ?? version}.tgz`,
        },
        ...info[version],
      };
    }
    return new Response(
      JSON.stringify({
        name,
        versions,
        "dist-tags": {
          latest: info.latest ?? version,
        },
      }),
    );
  };
}

export async function readdirSorted(path: PathLike): Promise<string[]> {
  const results = await readdir(path);
  results.sort();
  return results;
}

export function setHandler(newHandler: RequestHandler) {
  handler = newHandler;
}

function resetHanlder() {
  setHandler(() => new Response("Tea Break~", { status: 418 }));
}

export function dummyBeforeAll() {
  server = Bun.serve({
    async fetch(request) {
      requested++;
      return await handler(request);
    },
    port: 0,
  });
  root_url = `http://localhost:${server.port}`;
}

export function dummyAfterAll() {
  server.stop();
}

var packageDirGetter: () => Promise<string> = async () => {
  return await realpath(await mkdtemp(join(await realpath(tmpdir()), "bun-install-test-" + testCounter++ + "--")));
};
export async function dummyBeforeEach() {
  resetHanlder();
  requested = 0;
  package_dir = await packageDirGetter();

  await writeFile(
    join(package_dir, "bunfig.toml"),
    `
[install]
cache = false
registry = "http://localhost:${server.port}/"
`,
  );
}

export async function dummyAfterEach() {
  resetHanlder();
  await rm(package_dir, { force: true, recursive: true });
}

if (Bun.main === import.meta.path) {
  // @ts-expect-error
  expect = value => {
    return {
      toBe(expected) {
        if (value !== expected) {
          throw new Error(`Expected ${value} to be ${expected}`);
        }
      },
    };
  };
  if (process.env.PACKAGE_DIR_TO_USE) {
    packageDirGetter = () => Promise.resolve(process.env.PACKAGE_DIR_TO_USE!);
  }

  await dummyBeforeAll();
  await dummyBeforeEach();
  setHandler(dummyRegistry([]));
  console.log("Running dummy registry!\n\n URL: ", root_url!, "\n", "DIR: ", package_dir!);
} else {
  // @ts-expect-error
  ({ expect } = Bun.jest(import.meta.path));
}