import { test } from "node:test";
import assert from "node:assert/strict";
import { execFileSync } from "node:child_process";
import { mkdtempSync, rmSync, writeFileSync } from "node:fs";
import { tmpdir } from "node:os";
import { join } from "node:path";

import { carry } from "./integration/forge.ts";

/**
 * A bed's forge takes the lab's checkouts as they are: shallow (novox/hq issue 689). The lab module clones
 * every repository with `--depth`, and the genesis bed's forge refused the push ("shallow update not
 * allowed"), so the bed never reached its installer. Held here with a real git and no lab.
 */

const git = (cwd: string, ...args: string[]) =>
  execFileSync("git", ["-C", cwd, ...args], { encoding: "utf8", stdio: ["ignore", "pipe", "pipe"],
    env: { ...process.env, GIT_AUTHOR_NAME: "lab", GIT_AUTHOR_EMAIL: "lab@example.org",
      GIT_COMMITTER_NAME: "lab", GIT_COMMITTER_EMAIL: "lab@example.org" } }).trim();

test("a shallow checkout, as the lab clones it, is carried into the bed's forge and served from it", () => {
  const dir = mkdtempSync(join(tmpdir(), "mesh-lab-689-"));
  try {
    const origin = join(dir, "origin");
    execFileSync("git", ["init", "-q", "-b", "main", origin]);
    for (let i = 0; i < 5; i++) {
      writeFileSync(join(origin, "file"), `${i}\n`);
      git(origin, "add", "file");
      git(origin, "commit", "-q", "-m", `commit ${i}`);
    }
    // As the lab module clones: shallow, over a transport that honours the depth.
    const checkout = join(dir, "checkout");
    execFileSync("git", ["clone", "-q", "--depth", "2", "--branch", "main", `file://${origin}`, checkout]);
    assert.equal(git(checkout, "rev-parse", "--is-shallow-repository"), "true");

    const bare = join(dir, "forge", "repo.git");
    const head = carry(checkout, bare, ["main", "lab"]);
    assert.equal(head, git(origin, "rev-parse", "HEAD"));
    assert.equal(git(bare, "rev-parse", "refs/heads/main"), head);
    assert.equal(git(bare, "rev-parse", "refs/heads/lab"), head);

    // What the bed's machines do with it: clone over git's protocol, and find the commit under test.
    const served = join(dir, "served");
    execFileSync("git", ["clone", "-q", "--branch", "main", `file://${bare}`, served]);
    assert.equal(git(served, "rev-parse", "HEAD"), head);
    assert.equal(git(served, "show", "HEAD:file"), "4");
  } finally {
    rmSync(dir, { recursive: true, force: true });
  }
});