import assert from "node:assert/strict";
import fs from "node:fs";
import os from "node:os";
import path from "node:path";
import { syncPublicAssets } from "./fast-public-assets.ts";

const root = fs.mkdtempSync(path.join(os.tmpdir(), "freecad-public-sync-"));
try {
  const source = path.join(root, "public");
  const output = path.join(root, "dist");
  fs.mkdirSync(path.join(source, "kernel"), { recursive: true });
  const asset = path.join(source, "kernel", "module.wasm");
  fs.writeFileSync(asset, "first wasm");
  syncPublicAssets(source, output);
  const destination = path.join(output, "kernel", "module.wasm");
  assert.equal(fs.readFileSync(destination, "utf8"), "first wasm");
  const inode = fs.statSync(destination).ino;
  const modified = fs.statSync(destination).mtimeMs;
  fs.writeFileSync(path.join(output, "stale-bundle.js"), "old bundle");
  fs.writeFileSync(path.join(output, "kernel", "obsolete.wasm"), "old module");
  syncPublicAssets(source, output);
  assert.equal(fs.statSync(destination).ino, inode);
  assert.equal(fs.statSync(destination).mtimeMs, modified);
  assert.equal(fs.existsSync(path.join(output, "stale-bundle.js")), false);
  assert.equal(fs.existsSync(path.join(output, "kernel", "obsolete.wasm")), false);
  fs.writeFileSync(asset, "other wasm");
  const withinSameSecond = Math.floor(modified / 1000) + 0.123456;
  fs.utimesSync(asset, withinSameSecond, withinSameSecond);
  syncPublicAssets(source, output);
  assert.equal(fs.readFileSync(destination, "utf8"), "other wasm");
  fs.writeFileSync(asset, "new wasm with changes");
  syncPublicAssets(source, output);
  assert.equal(fs.readFileSync(destination, "utf8"), "new wasm with changes");
  assert.throws(() => syncPublicAssets(source, root), /disjoint/);
  fs.symlinkSync(source, path.join(root, "linked"));
  assert.throws(() => syncPublicAssets(source, path.join(root, "linked")), /symlink/);
  console.log("PASS: incremental asset reuse, replacement, stale cleanup and path guards");
} finally {
  fs.rmSync(root, { recursive: true, force: true });
}