import express from 'express';
import pino from 'pino';
import pinoHttp from 'pino-http';
import { assertSafeWorkerRuntimeConfig } from './lib/runtime-safety.js';

const logger = pino({ level: process.env.LOG_LEVEL || 'info' });

export function createWorkerApp({ dispatch = async () => ({}) } = {}) {
  assertSafeWorkerRuntimeConfig();
  const app = express();

  app.use(
    pinoHttp({
      logger,
    })
  );
  app.use(express.json({ limit: '256kb' }));

  app.get('/health', (_req, res) => {
    res.status(200).json({ ok: true, service: 'notification-worker-v2' });
  });

  app.get('/readyz', (_req, res) => {
    res.status(200).json({ ok: true, service: 'notification-worker-v2' });
  });

  app.post('/tasks/dispatch-notifications', async (req, res) => {
    try {
      const summary = await dispatch();
      res.status(200).json({ ok: true, summary });
    } catch (error) {
      req.log?.error?.({ err: error }, 'notification dispatch failed');
      res.status(500).json({
        ok: false,
        error: error?.message || String(error),
      });
    }
  });

  app.use((_req, res) => {
    res.status(404).json({
      code: 'NOT_FOUND',
      message: 'Route not found',
    });
  });

  return app;
}