// Verify-before-save probe for the Playwright connector.
//
// Prints exactly ONE JSON object on stdout:
//   {"ok": bool, "message": string, "details"?: object}
// Exit code 0 on success, 1 on failure. All diagnostics go to stderr.
//
// This connector has no credentials; what can actually break at runtime is
// the Chromium side: the binary must be present and launchable headless in
// this environment (system libraries, sandbox restrictions). The probe
// launches a real headless Chromium on about:blank and closes it.
import { createRequire } from "node:module";
import { existsSync } from "node:fs";
import { basename } from "node:path";

const require = createRequire(import.meta.url);

const finish = (ok, message, details) => {
  const out = { ok, message };
  if (details) out.details = details;
  process.stdout.write(JSON.stringify(out) + "\n");
  process.exit(ok ? 0 : 1);
};

let chromium;
let executablePath;
try {
  // Resolve playwright-core relative to @playwright/mcp (it is a dependency
  // of the pinned package, not of this connector's package.json).
  const mcpRequire = createRequire(require.resolve("@playwright/mcp/package.json"));
  ({ chromium } = mcpRequire("playwright-core"));
  executablePath = chromium.executablePath();
} catch (e) {
  finish(false, `Cannot resolve the Playwright installation: ${e.message}`);
}

if (!existsSync(executablePath)) {
  finish(false, "The Chromium binary is not installed. Reinstall the connector dependencies (the postinstall step downloads it).", { executablePath });
}

let browser;
try {
  browser = await chromium.launch({ headless: true, args: ["--no-sandbox"] });
} catch (e) {
  finish(false, `Chromium failed to launch: ${String(e.message).split("\n")[0]}`, { executablePath });
}

try {
  const page = await browser.newPage();
  await page.goto("about:blank");
  finish(true, `Chromium launched headless successfully (${basename(executablePath)}).`);
} finally {
  await browser.close().catch(() => {});
}