import test from "node:test";
import assert from "node:assert/strict";
import { createHash } from "node:crypto";
import { execFile } from "node:child_process";
import fs from "node:fs/promises";
import os from "node:os";
import path from "node:path";
import { promisify } from "node:util";
import { parseWorktreeCommand } from "../src/git-worktree-proxy.mjs";
import { parseAsar, readAsarMember, replaceAsarMember } from "../src/asar.mjs";

const exec = promisify(execFile);
const proxyPath = path.resolve("bin/git-worktree-proxy.mjs");

function tinyAsar(memberPath, content) {
  const parts = memberPath.split("/");
  const header = { files: {} };
  let files = header.files;
  for (const part of parts.slice(0, -1)) {
    files[part] = { files: {} };
    files = files[part].files;
  }
  files[parts.at(-1)] = { size: content.length, offset: "0" };
  const json = Buffer.from(JSON.stringify(header));
  const padded = (json.length + 4) & ~3;
  const prefix = Buffer.alloc(16 + padded);
  prefix.writeUInt32LE(4, 0);
  prefix.writeUInt32LE(8 + padded, 4);
  prefix.writeUInt32LE(4 + padded, 8);
  prefix.writeUInt32LE(json.length, 12);
  json.copy(prefix, 16);
  return Buffer.concat([prefix, content]);
}

test("parseWorktreeCommand handles Desktop's global Git config arguments", () => {
  const parsed = parseWorktreeCommand([
    "-c", "safe.bareRepository=explicit",
    "-c", "core.hooksPath=/dev/null",
    "-C", "repo",
    "worktree", "add", "--detach", "../target", "deadbeef",
  ], "/tmp/base");
  assert.deepEqual(parsed, {
    cwd: "/tmp/base/repo",
    subcommand: "add",
    force: false,
    targetPath: "/tmp/base/target",
    revision: "deadbeef",
  });
});

test("replaceAsarMember preserves readable members and updates offsets", () => {
  const first = Buffer.from("worker");
  const archive = tinyAsar("build/worker.js", first);
  const replacement = Buffer.from("patched worker contents");
  const result = replaceAsarMember(archive, "build/worker.js", replacement);
  assert.equal(readAsarMember(result.archive, "build/worker.js").toString(), replacement.toString());
  const headerHash = createHash("sha256").update(parseAsar(result.archive).headerBytes).digest("hex");
  assert.equal(result.headerHash, headerHash);
});

test("Git worktree proxy creates and removes a jj workspace only for a jj source", async (t) => {
  try {
    await exec("jj", ["--version"]);
  } catch {
    t.skip("jj is unavailable");
    return;
  }

  const root = await fs.mkdtemp(path.join(os.tmpdir(), "omp-proxy-jj-"));
  const repo = path.join(root, "repo");
  const target = path.join(root, "missing", "nested", "target");
  const legacyGitTarget = path.join(root, "legacy-git-target");
  try {
    await exec("jj", ["git", "init", "--colocate", repo]);
    await fs.writeFile(path.join(repo, "base.txt"), "base\n");
    await exec("jj", ["commit", "-R", repo, "-m", "base"]);
    const revision = (await exec("git", ["-C", repo, "rev-parse", "HEAD"])).stdout.trim();
    await fs.writeFile(path.join(repo, "base.txt"), "newer source state\n");
    await exec("jj", ["commit", "-R", repo, "-m", "newer"]);

    await exec(process.execPath, [proxyPath, "-C", repo, "-c", "safe.bareRepository=explicit", "worktree", "add", "--detach", target, revision]);
    assert.equal((await fs.stat(path.join(target, ".jj"))).isDirectory(), true);
    assert.equal((await fs.stat(path.join(target, ".git"))).isFile(), true);
    assert.equal(
      await fs.realpath((await exec("jj", ["root", "-R", target])).stdout.trim()),
      await fs.realpath(target)
    );
    assert.equal((await exec("git", ["-C", target, "rev-parse", "HEAD"])).stdout.trim(), revision);
    assert.equal(await fs.readFile(path.join(target, "base.txt"), "utf8"), "base\n");
    await fs.writeFile(path.join(target, "dirty.txt"), "keep me\n");
    await assert.rejects(
      exec(process.execPath, [proxyPath, "-C", repo, "worktree", "remove", target]),
      /contains modified or untracked files/
    );
    assert.equal(await fs.readFile(path.join(target, "dirty.txt"), "utf8"), "keep me\n");

    await exec(process.execPath, [proxyPath, "-C", repo, "worktree", "remove", "--force", target]);
    assert.equal(await fs.stat(target).then(() => true).catch(() => false), false);

    await exec("git", ["-C", repo, "worktree", "add", "--detach", legacyGitTarget, revision]);
    await exec(process.execPath, [proxyPath, "-C", repo, "worktree", "remove", "--force", legacyGitTarget]);
    const listedWorktrees = (await exec("git", ["-C", repo, "worktree", "list", "--porcelain"])).stdout;
    assert.equal(listedWorktrees.includes(legacyGitTarget), false);
  } finally {
    await fs.rm(root, { recursive: true, force: true });
  }
});

test("Git worktree proxy delegates Git-native repositories", async () => {
  const root = await fs.mkdtemp(path.join(os.tmpdir(), "omp-proxy-git-"));
  const repo = path.join(root, "repo");
  const target = path.join(root, "target");
  try {
    await exec("git", ["init", "-q", repo]);
    await exec("git", ["-C", repo, "config", "user.name", "Test"]);
    await exec("git", ["-C", repo, "config", "user.email", "test@example.com"]);
    // Throwaway fixture: never inherit the developer's commit signing, which
    // needs an agent this test has no reason to depend on.
    await exec("git", ["-C", repo, "config", "commit.gpgsign", "false"]);
    await fs.writeFile(path.join(repo, "base.txt"), "base\n");
    await exec("git", ["-C", repo, "add", "base.txt"]);
    await exec("git", ["-C", repo, "commit", "-qm", "base"]);

    await exec(process.execPath, [proxyPath, "-C", repo, "worktree", "add", "--detach", target, "HEAD"]);
    assert.equal((await fs.stat(path.join(target, ".git"))).isFile(), true);
    assert.equal(await fs.stat(path.join(target, ".jj")).then(() => true).catch(() => false), false);
    await exec(process.execPath, [proxyPath, "-C", repo, "worktree", "remove", "--force", target]);
  } finally {
    await fs.rm(root, { recursive: true, force: true });
  }
});