import fs from "node:fs/promises";
import path from "node:path";
import { fileURLToPath } from "node:url";

const projectRoot = path.resolve(
  path.dirname(fileURLToPath(import.meta.url)),
  "..",
);
const distDirectory = path.join(projectRoot, "dist");
const manifest = JSON.parse(
  await fs.readFile(path.join(projectRoot, "package.json"), "utf8"),
);
const currentVersion = String(manifest.version || "").trim();

if (!/^\d+\.\d+\.\d+(?:[-+][0-9A-Za-z.-]+)?$/.test(currentVersion)) {
  throw new Error("package.json contains an invalid release version.");
}

const entries = await fs
  .readdir(distDirectory, { withFileTypes: true })
  .catch((error) => {
    if (error.code === "ENOENT") return [];
    throw error;
  });
const removed = [];

for (const entry of entries) {
  if (!entry.isFile() || !entry.name.startsWith("ForgeFlow-")) continue;
  if (entry.name.includes(`-${currentVersion}-`)) continue;
  await fs.rm(path.join(distDirectory, entry.name), { force: true });
  removed.push(entry.name);
}

if (removed.length) {
  console.log(`Removed ${removed.length} obsolete dist artifact(s):`);
  for (const name of removed) console.log(`- ${name}`);
} else {
  console.log(
    `No ForgeFlow dist artifacts older than ${currentVersion} found.`,
  );
}