import fs from "node:fs";
import path from "node:path";
import { spawn, type ChildProcess } from "node:child_process";

let noReplyProcess: ChildProcess | null = null;

export function startNoReplyApi(
  logger: { info: (m: string) => void; warn: (m: string) => void },
  pluginDir: string,
  port = 8787,
): void {
  logger.info(`dirigent: startNoReplyApi called, pluginDir=${pluginDir}`);

  if (noReplyProcess) {
    logger.info("dirigent: no-reply API already running, skipping");
    return;
  }

  const serverPath = path.resolve(pluginDir, "..", "no-reply-api", "server.mjs");
  logger.info(`dirigent: resolved serverPath=${serverPath}`);

  if (!fs.existsSync(serverPath)) {
    logger.warn(`dirigent: no-reply API server not found at ${serverPath}, skipping`);
    return;
  }

  logger.info("dirigent: no-reply API server found, spawning process...");

  noReplyProcess = spawn(process.execPath, [serverPath], {
    env: { ...process.env, PORT: String(port) },
    stdio: ["ignore", "pipe", "pipe"],
    detached: false,
  });

  noReplyProcess.stdout?.on("data", (d: Buffer) => logger.info(`dirigent: no-reply-api: ${d.toString().trim()}`));
  noReplyProcess.stderr?.on("data", (d: Buffer) => logger.warn(`dirigent: no-reply-api: ${d.toString().trim()}`));

  noReplyProcess.on("exit", (code, signal) => {
    logger.info(`dirigent: no-reply API exited (code=${code}, signal=${signal})`);
    noReplyProcess = null;
  });

  logger.info(`dirigent: no-reply API started (pid=${noReplyProcess.pid}, port=${port})`);
}

export function stopNoReplyApi(logger: { info: (m: string) => void }): void {
  if (!noReplyProcess) return;
  logger.info("dirigent: stopping no-reply API");
  noReplyProcess.kill("SIGTERM");
  noReplyProcess = null;
}