require('dotenv').config();
const express = require('express');
const { Pool } = require('pg');
const bodyParser = require('body-parser');
const cors = require('cors');
const path = require('path');

const app = express();
const port = process.env.PORT || 3000;

app.use(cors());
app.use(bodyParser.json());

// Serve static files from the root directory
app.use(express.static(path.join(__dirname, './')));

const pool = new Pool({
  host: process.env.DB_HOST,
  port: process.env.DB_PORT,
  database: process.env.DB_NAME,
  user: process.env.DB_USER,
  password: process.env.DB_PASSWORD
});

// Test DB Connection
pool.connect()
  .then(() => console.log('Connected to PostgreSQL successfully'))
  .catch(err => console.error('Connection error', err.stack));

// Status-Endpunkt für Diagnose
app.get('/api/status', async (req, res) => {
    try {
        const result = await pool.query('SELECT NOW()');
        res.json({ 
            status: 'online', 
            database: 'connected', 
            time: result.rows[0].now,
            schema: process.env.DB_SCHEMA || 'geodaten'
        });
    } catch (err) {
        res.status(500).json({ status: 'error', database: 'disconnected', error: err.message });
    }
});

// API to save turbines
app.post('/api/wea', async (req, res) => {
    const { projekt_id, turbines } = req.body;
    const targetProject = projekt_id || 'BWSamern-Ohne';
    const schema = process.env.DB_SCHEMA || 'geodaten';
    
    console.log(`Empfange Save-Request für Projekt: ${targetProject} (${turbines?.length || 0} WEAs)`);

    const client = await pool.connect();
    try {
        await client.query('BEGIN');
        
        // 1. Bestehende WEAs für dieses Projekt löschen
        await client.query(
            `DELETE FROM ${schema}.wea_standorte WHERE projekt_id = $1`,
            [targetProject]
        );

        // 2. Neue WEAs einfügen
        if (turbines && turbines.length > 0) {
            for (const t of turbines) {
                await client.query(
                    `INSERT INTO ${schema}.wea_standorte 
                    (projekt_id, wea_nummer, anlagentyp, nabenhoehe, rotordurchmesser, geom) 
                    VALUES ($1, $2, $3, $4, $5, ST_Transform(ST_SetSRID(ST_MakePoint($6, $7), 4326), 25832))`,
                    [targetProject, t.nr, t.type, t.hh, t.rd, t.latlng.lng, t.latlng.lat]
                );
            }
        }

        await client.query('COMMIT');
        console.log(`Erfolgreich ${turbines?.length || 0} WEAs gespeichert.`);
        res.json({ message: `${turbines?.length || 0} WEAs erfolgreich in Datenbank gespeichert.` });
    } catch (err) {
        await client.query('ROLLBACK');
        console.error('Fehler beim Speichern in DB:', err);
        res.status(500).json({ error: 'Datenbankfehler beim Speichern', details: err.message });
    } finally {
        client.release();
    }
});

// API to load turbines
app.get('/api/wea/:projekt_id', async (req, res) => {
    const { projekt_id } = req.params;
    try {
        const result = await pool.query(
            `SELECT wea_nummer as nr, anlagentyp as type, nabenhoehe as hh, rotordurchmesser as rd, ksf_drehung as ksfAngle,
                    ST_X(ST_Transform(geom, 4326)) as lng, ST_Y(ST_Transform(geom, 4326)) as lat
             FROM geodaten.wea_standorte WHERE projekt_id = $1`,
            [projekt_id]
        );
        res.status(200).json(result.rows);
    } catch (e) {
        console.error('Error loading turbines', e);
        res.status(500).json({ error: e.message });
    }
});

// Catch-all route to serve index.html for any other request (optional, good for SPAs)
app.get('*', (req, res) => {
  res.sendFile(path.join(__dirname, 'index.html'));
});

app.listen(port, '0.0.0.0', () => {
    console.log(`Server running at http://0.0.0.0:${port}`);
});