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

import type { TechLogServingContract } from "./tech-log-serving-contract.ts";

type ServingArtifactOptions = Readonly<{
  distRoot: string;
  contract: TechLogServingContract;
  serverSourcePath?: string;
}>;

export async function writeTechLogServingArtifact({
  distRoot,
  contract,
  serverSourcePath = "scripts/lib/tech-log-production-server.ts",
}: ServingArtifactOptions): Promise<void> {
  const absoluteDistRoot = path.resolve(distRoot);
  const serverSource = await readFile(path.resolve(serverSourcePath), "utf8");
  await mkdir(absoluteDistRoot, { recursive: true });
  await Promise.all([
    writeFile(
      path.join(absoluteDistRoot, "tech-log-serving-contract.json"),
      `${JSON.stringify(contract, null, 2)}\n`,
    ),
    writeFile(path.join(absoluteDistRoot, "server.mjs"), serverSource),
  ]);
}