import { Logger } from "@nestjs/common";
import type { INestApplication } from "@nestjs/common";

import { bootstrap } from "./app/bootstrap.js";

const logger = new Logger("Main");
let app: INestApplication | null = null;

const signals: NodeJS.Signals[] = ["SIGINT", "SIGTERM"];
for (const signal of signals) {
  process.once(signal, () => {
    void (async () => {
      logger.log(`Received ${signal}. Closing Nest application...`);
      // #region agent log (hypothesis S1)
      fetch("http://127.0.0.1:7242/ingest/a683e422-cfe7-4556-a583-809fbfbeeb4a", {
        method: "POST",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify({
          sessionId: "debug-session",
          runId: "run1",
          hypothesisId: "S1",
          location: "apps/bff/src/main.ts:signalHandler(entry)",
          message: "Process signal handler invoked",
          data: { signal, pid: process.pid, appInitialized: !!app },
          timestamp: Date.now(),
        }),
      }).catch(() => {});
      // #endregion

      if (!app) {
        logger.warn("Nest application not initialized. Exiting immediately.");
        process.exit(0);
        return;
      }

      try {
        // #region agent log (hypothesis S1)
        fetch("http://127.0.0.1:7242/ingest/a683e422-cfe7-4556-a583-809fbfbeeb4a", {
          method: "POST",
          headers: { "Content-Type": "application/json" },
          body: JSON.stringify({
            sessionId: "debug-session",
            runId: "run1",
            hypothesisId: "S1",
            location: "apps/bff/src/main.ts:signalHandler(beforeClose)",
            message: "Calling app.close()",
            data: { signal, pid: process.pid },
            timestamp: Date.now(),
          }),
        }).catch(() => {});
        // #endregion
        await app.close();
        logger.log("Nest application closed gracefully.");
      } catch (error) {
        const resolvedError = error as Error;
        logger.error(
          `Error during Nest application shutdown: ${resolvedError.message}`,
          resolvedError.stack
        );
      } finally {
        // #region agent log (hypothesis S1)
        fetch("http://127.0.0.1:7242/ingest/a683e422-cfe7-4556-a583-809fbfbeeb4a", {
          method: "POST",
          headers: { "Content-Type": "application/json" },
          body: JSON.stringify({
            sessionId: "debug-session",
            runId: "run1",
            hypothesisId: "S1",
            location: "apps/bff/src/main.ts:signalHandler(exit)",
            message: "Exiting process after shutdown handler",
            data: { signal, pid: process.pid },
            timestamp: Date.now(),
          }),
        }).catch(() => {});
        // #endregion
        process.exit(0);
      }
    })();
  });
}

void bootstrap()
  .then(startedApp => {
    app = startedApp;
  })
  .catch(error => {
    const resolvedError = error as Error;
    logger.error(
      `Failed to bootstrap the Nest application: ${resolvedError.message}`,
      resolvedError.stack
    );
    process.exit(1);
  });