import { mkdir, writeFile } from "node:fs/promises";
import path from "node:path";

/** An empty but valid git directory, so git commands stop here instead of searching upwards. */
async function writeGitDirectory(project: string): Promise<void> {
  await mkdir(path.join(project, ".git", "objects"), { recursive: true });
  await mkdir(path.join(project, ".git", "refs"), { recursive: true });
  await writeFile(path.join(project, ".git", "HEAD"), "ref: refs/heads/main\n");
}

async function writeFiles(root: string, files: Record<string, string>): Promise<void> {
  for (const [relative, content] of Object.entries(files)) {
    const file = path.join(root, relative);
    await mkdir(path.dirname(file), { recursive: true });
    await writeFile(file, content);
  }
}

/**
 * A home folder for the onboarding scan: two projects ("code/atlas" in TypeScript with Docker and
 * GitHub Actions, "code/garden" in Python) and a notes folder that is not a project.
 */
export async function writeOnboardingScanFixture(home: string): Promise<void> {
  await writeFiles(home, {
    "code/atlas/src/index.ts": "export const atlas = 1;\n",
    "code/atlas/src/app.tsx": "export const App = () => null;\n",
    "code/atlas/Dockerfile": "FROM scratch\n",
    "code/atlas/.github/workflows/ci.yml": "on: push\n",
    "code/garden/main.py": "print('garden')\n",
    "code/garden/util.py": "VALUE = 1\n",
    "notes/todo.md": "- water the plants\n",
  });
  await writeGitDirectory(path.join(home, "code/atlas"));
  await writeGitDirectory(path.join(home, "code/garden"));
}