import { MongoAPIError, ObjectId } from 'mongodb';
import bcrypt from 'bcrypt';
import { getCollections, update_pflux } from '../db/mongo.js';

export function registerApiRoutes(app, requireLogin) {
  const { usersCollection, prop_fluxCollection } = getCollections();

  app.get('/api/check-email', async (req, res) => {
    const email = (req.query.email || '').toLowerCase().trim();
    if (!email) return res.json({ exists: false });
    try {
      const existingUser = await usersCollection.findOne({ email:`${email}` });
      res.json({ exists: !!existingUser });
    } catch (err) {
      console.error(err);
      res.status(500).json({ error: 'Fehler bei der E-Mail-Prüfung' });
    }
  });

  app.post('/api/save', requireLogin, async (req, res) => {
    let { espId, sensorNumber, name, description} = req.body;
    if (!espId || !sensorNumber) {
      return res.json({ error: 'ESP-ID und Sensornummer sind Pflichtfelder' });
    }
    sensorNumber = parseInt(sensorNumber, 10);
    try {
      const doc = {
        id: espId,
        name: name || '',
        description: description || '',
        lastUpdatedAt: new Date()
      };
      await update_pflux(sensorNumber, doc)
      res.json({ success: true });
    } catch (err) {
      console.error(err);
      res.status(500).json({ error: 'Fehler beim Speichern' });
    }
  });


  app.get('/api/list', requireLogin, async (req, res) => {
    const { id } = req.query;
    if (id) {
      try {
        const item = await prop_fluxCollection.findOne({ _id: parseInt(id) });
        if (item) return res.json([item]);
        return res.json([]);
      } catch (err) {
        console.error(err);
        return res.status(500).json({ error: 'Fehler beim Laden' });
      }
    }

    let gesamtZahl = 0
    try {
        gesamtZahl = await prop_fluxCollection.countDocuments({chip: {$exists: true}})
    } catch (err) {
      console.error(err);
    }
    const page = parseInt(req.query.page) || 1;
    const limit = parseInt(req.query.limit) || 50;
    const skip = (page - 1) * limit;
    try {
      const items = await prop_fluxCollection.find({chip: {$exists: true}})
        .sort({ "chip.lastUpdatedAt": -1 })
        .skip(skip)
        .limit(limit)
        .toArray();
      const data = {items: items, anzahl: gesamtZahl}  
      res.json(data);
    } catch (err) {
      console.error(err);
      res.status(500).json({ error: 'Fehler beim Laden' });
    }
  });

  app.delete('/api/delete/:id', requireLogin, async (req, res) => {
    await prop_fluxCollection.deleteOne({ _id: parseInt(req.params.id) });
    res.json({ success: true });
  });

  app.post('/api/createUser', requireLogin, async (req, res) => {
    if (!req.session.isAdmin) return res.status(403).json({ error: 'Nur Admins erlaubt' });
    const { username, password, role } = req.body;
    if (!username || !password) return res.status(400).json({ error: 'Benutzername und Passwort erforderlich' });
    try {
      const hash = await bcrypt.hash(password, 10);
      await usersCollection.insertOne({ email: username.toLowerCase(), passwordHash: hash, role: role || 'user' });
      res.json({ success: true });
    } catch (err) {
      res.status(500).json({ error: 'Fehler beim Anlegen' });
    }
  });
}