import { createServer } from "node:http";
import { readFile } from "node:fs/promises";
import { mkdtemp, rm } from "node:fs/promises";
import { normalize, join } from "node:path";
import { tmpdir } from "node:os";
import { pathToFileURL } from "node:url";

const root = new URL("../web/", import.meta.url).pathname.replace(/\/$/, "");
const modulePath = process.env.PLAYWRIGHT_MODULE;

function blocked(code, reason = null) {
  console.log(JSON.stringify({ schema: "browser-opfs-s6-06-restart-sample.v1", status: "blocked", browser: "chromium", code, reason }));
}

if (!modulePath) {
  blocked("playwright_unavailable", "PLAYWRIGHT_MODULE is not set");
} else {
  let server;
  let context;
  const profile = await mkdtemp(join(tmpdir(), "linuxcnc-opfs-restart-s6-06-"));
  try {
    const imported = await import(pathToFileURL(modulePath).href);
    const playwright = imported.default ?? imported;
    server = createServer(async (request, response) => {
      const requested = (request.url ?? "/").split("?")[0];
      const relative = requested === "/" ? "/app/browser-opfs-probe.html" : requested;
      const file = normalize(join(root, relative));
      if (!file.startsWith(root + "/")) { response.writeHead(403); response.end(); return; }
      try { const body = await readFile(file); response.writeHead(200, { "content-type": file.endsWith(".html") ? "text/html" : "text/javascript", "cache-control": "no-store" }); response.end(body); } catch { response.writeHead(404); response.end(); }
    });
    await new Promise((resolve) => server.listen(0, "127.0.0.1", resolve));
    const port = server.address().port;
    context = await playwright.chromium.launchPersistentContext(profile, { headless: false });
    const writer = await context.newPage();
    await writer.goto(`http://127.0.0.1:${port}/app/browser-opfs-probe.html?mode=write&cleanup=false`);
    await writer.waitForFunction(() => document.querySelector("#result")?.textContent !== "pending", null, { timeout: 10000 });
    const written = JSON.parse(await writer.locator("#result").textContent());
    if (written.status !== "verified") throw new Error(written.code ?? "opfs_write_blocked");
    await context.close();
    context = await playwright.chromium.launchPersistentContext(profile, { headless: false });
    const reader = await context.newPage();
    await reader.goto(`http://127.0.0.1:${port}/app/browser-opfs-probe.html?mode=read&cleanup=true`);
    await reader.waitForFunction(() => document.querySelector("#result")?.textContent !== "pending", null, { timeout: 10000 });
    const restored = JSON.parse(await reader.locator("#result").textContent());
    if (restored.status !== "verified" || restored.content_hash !== written.content_hash || restored.cleanup !== true) throw new Error("opfs_restart_record_mismatch");
    console.log(JSON.stringify({ schema: "browser-opfs-s6-06-restart-sample.v1", status: "verified", browser: "chromium", browser_version: (await context.browser()).version(), mode: "persistent_profile_close_reopen", commit_seq: restored.commit_seq, content_hash: restored.content_hash, cleanup: restored.cleanup }));
  } catch (error) {
    blocked("opfs_restart_probe_failed", error?.name ?? String(error));
  } finally {
    await context?.close().catch(() => {});
    server?.close();
    await rm(profile, { recursive: true, force: true });
  }
}