// Express-App der appRobotFileservice. createApp() ist test-freundlich (kein listen).
const path = require('path');
const express = require('express');
const programsRouter = require('./routes/programs');
const activeRouter   = require('./routes/active');
const foldersRouter  = require('./routes/folders');
const { errorMiddleware, envelope } = require('./errors');
const log = require('./log');

function createApp() {
  const app = express();
  app.use(express.json({ limit: '5mb' }));

  // Request-Logging: jede Anfrage mit Methode, Pfad, Status und Dauer. So sieht man
  // im Container-Log sofort, ob der Driver durchkommt und wie der Service antwortet.
  app.use((req, res, next) => {
    const t0 = Date.now();
    res.on('finish', () => {
      const ms = Date.now() - t0;
      const mark = res.statusCode >= 400 ? '✖' : '→';
      log.info(`${mark} ${req.method} ${req.originalUrl} ${res.statusCode} (${ms}ms)`);
    });
    next();
  });

  app.get('/api/health', (req, res) => res.json({ ok: true, service: 'appRobotFileservice' }));
  app.use('/api/programs', programsRouter);
  app.use('/api/folders',  foldersRouter);
  app.use('/api/active',   activeRouter);

  // Web-UI: statische Dateien aus public/ (index.html, index.css)
  app.use(express.static(path.join(__dirname, '..', 'public')));

  // Unbekannter Pfad → 404-Envelope
  app.use((req, res) => res.status(404).json(envelope('NOT_FOUND', 'unknown endpoint', req.path)));
  app.use(errorMiddleware);
  return app;
}

module.exports = { createApp };