import { afterEach, describe, expect, it, vi } from "vitest";
import { execFile } from "node:child_process";
import { promisify } from "node:util";
import { mkdtemp, mkdir, readFile, realpath, rm, symlink, writeFile } from "node:fs/promises";
import { Readable } from "node:stream";
import { createHash } from "node:crypto";
import os from "node:os";
import path from "node:path";
import { workFolderTransport } from "../services/work-folder-transport.js";
import { localTestWorkFolderRunner } from "./helpers/work-folder-runner.js";

const exec = promisify(execFile);
describe("sandbox work folder transport with real Node and Git", () => {
  const roots: string[] = [];
  const transport = workFolderTransport(localTestWorkFolderRunner);
  async function root() {
    const dir = await realpath(await mkdtemp(path.join(os.tmpdir(), "work-folder-io-")));
    roots.push(dir); return dir;
  }
  afterEach(async () => { for (const dir of roots.splice(0)) await rm(dir, { recursive: true, force: true }); });
  it("retries a lost read response without duplicating streamed bytes", async () => {
    const dir = await root();
    const body = Buffer.alloc(700_000, "x");
    await writeFile(path.join(dir, "file"), body);
    let lostResponse = false;
    const execute = vi.fn(async (input: Parameters<typeof localTestWorkFolderRunner.execute>[0]) => {
      const result = await localTestWorkFolderRunner.execute(input);
      const request = JSON.parse(Buffer.from(input.args!.at(-1)!, "base64").toString());
      if (request.operation === "read" && request.offset > 0 && !lostResponse) {
        lostResponse = true;
        throw Object.assign(new Error("socket hang up"), { code: "ECONNRESET" });
      }
      return result;
    });
    const chunks = [];
    for await (const chunk of workFolderTransport({ execute }).read(dir, "file", body.length)) chunks.push(chunk);
    expect(lostResponse).toBe(true);
    expect(Buffer.concat(chunks)).toEqual(body);
    const offsets = execute.mock.calls.map(([input]) => JSON.parse(Buffer.from(input.args!.at(-1)!, "base64").toString()).offset);
    expect(offsets.filter((offset) => offset === offsets[1])).toHaveLength(2);
  });
  it("bounds read retries and does not replay mutations or validation failures", async () => {
    const execute = vi.fn().mockRejectedValue(new Error("socket hang up"));
    const retrying = workFolderTransport({ execute });
    await expect(retrying.scan("/home/daytona/task")).rejects.toThrow("socket hang up");
    expect(execute).toHaveBeenCalledTimes(3);
    execute.mockClear();
    await expect(retrying.moveRoot("/old", "/new")).rejects.toThrow("socket hang up");
    expect(execute).toHaveBeenCalledTimes(1);
    execute.mockReset().mockResolvedValue({ exitCode: 1, stdout: "", stderr: "symlink_not_allowed", timedOut: false });
    await expect(retrying.scan("/home/daytona/task")).rejects.toThrow("symlink_not_allowed");
    expect(execute).toHaveBeenCalledTimes(1);
  });
  it("streams and atomically publishes files larger than a transfer chunk", async () => {
    const dir = await root();
    const staging = await root();
    const body = Buffer.alloc(700_000, "x");
    const entry = { path: "nested/file", kind: "file" as const, byteSize: body.length,
      sha256: createHash("sha256").update(body).digest("hex"), executable: true };
    const boundedTransport = workFolderTransport({ async execute(input) {
      // macOS permits larger argv entries than Linux; enforce the deployment
      // bound here as well so this regression is caught on developer machines.
      expect(Buffer.byteLength([input.command, ...(input.args ?? [])].join(" "))).toBeLessThan(120 * 1024);
      return localTestWorkFolderRunner.execute(input);
    } });
    await boundedTransport.write(dir, staging, entry, Readable.from([body]));
    expect(await readFile(path.join(dir, entry.path))).toEqual(body);
    const files = await transport.scan(dir);
    expect(files.find((file) => file.path === entry.path)).toEqual(entry);
  });
  it("rejects links out of a work folder on scan and download", async () => {
    const dir = await root();
    const outside = await root();
    await writeFile(path.join(outside, "credential"), "private");
    await symlink(path.join(outside, "credential"), path.join(dir, "link"));
    await expect(transport.scan(dir)).rejects.toThrow("symlink_not_allowed");
    const stream = transport.read(dir, "link", 7);
    await expect((async () => { for await (const _chunk of stream) { /* consume */ } })()).rejects.toThrow("symlink_not_allowed");
  });
  it("includes uncommitted tracked and nonignored files plus Git state, excluding credentials and caches", async () => {
    const dir = await root();
    await exec("git", ["init", dir]);
    await writeFile(path.join(dir, ".gitignore"), "node_modules/\n");
    await writeFile(path.join(dir, "tracked"), "initial");
    await exec("git", ["-C", dir, "add", "."]);
    await exec("git", ["-C", dir, "-c", "user.name=Test", "-c", "user.email=test@example.com", "commit", "-m", "initial"]);
    await writeFile(path.join(dir, "tracked"), "unstaged");
    await writeFile(path.join(dir, "untracked"), "new");
    await mkdir(path.join(dir, "node_modules"));
    await writeFile(path.join(dir, "node_modules/cache"), "ignored");
    const paths = (await transport.scan(dir, true)).map((entry) => entry.path);
    expect(paths).toContain("tracked");
    expect(paths).toContain("untracked");
    expect(paths).toContain(".git/index");
    expect(paths).toContain(".git/HEAD");
    expect(paths).not.toContain(".git/config");
    expect(paths.some((entry) => entry.startsWith("node_modules/"))).toBe(false);
  });
  it("excludes nested Git repositories in private runner state before validating their trailing slash", async () => {
    const dir = await root();
    await exec("git", ["init", dir]);
    const privateRepo = path.join(dir, ".paperclip-runtime/session/codex-home/.tmp/plugins");
    await mkdir(privateRepo, { recursive: true });
    await exec("git", ["init", privateRepo]);
    await writeFile(path.join(privateRepo, "private-config"), "not durable");
    await writeFile(path.join(dir, "keep.txt"), "durable work");
    const listed = await exec("git", ["-C", dir, "ls-files", "--others", "--exclude-standard", "-z"]);
    expect(listed.stdout).toContain(".paperclip-runtime/session/codex-home/.tmp/plugins/\0");
    const paths = (await transport.scan(dir, true)).map((entry) => entry.path);
    expect(paths).toContain("keep.txt");
    expect(paths.some((entry) => entry.includes(".paperclip-runtime"))).toBe(false);
  });
});