// Evaluate an expression inside a running Obsidian started with
// --remote-debugging-port. Usage: bun t/cdp-eval.ts <port> "<js expression>"
const [port, expression] = process.argv.slice(2);
const targets = (await (
  await fetch(`http://localhost:${port}/json`)
).json()) as {
  type: string;
  title: string;
  webSocketDebuggerUrl: string;
}[];
const page = targets.find((t) => t.type === "page");
if (!page) {
  throw new Error("no page target");
}
const ws = new WebSocket(page.webSocketDebuggerUrl);
await new Promise((resolve) => ws.addEventListener("open", resolve));
const reply = new Promise<string>((resolve) => {
  ws.addEventListener("message", (event) => {
    const data = JSON.parse(String(event.data));
    if (data.id === 1) {
      resolve(
        JSON.stringify(data.result?.result?.value ?? data.result ?? data)
      );
    }
  });
});
ws.send(
  JSON.stringify({
    id: 1,
    method: "Runtime.evaluate",
    params: { awaitPromise: true, expression, returnByValue: true },
  })
);
console.log(await reply);
ws.close();