import mysql from "mysql";

const dbConfig = {
  host: process.env.DB_HOST,
  user: process.env.DB_USER,
  password: process.env.DB_PASSWORD,
  database: process.env.DB_NAME,
  port: process.env.DB_PORT,
};

const connection = mysql.createConnection(dbConfig);
connection.connect((err) => {
    if (err) {
      console.error("Fehler beim Verbinden:", err.stack);
      return;
    }
    console.log("Database connected successfully.");
});

export default function handler(req, res) {
  const idMap = req.query.idMap;
  if (req.method !== "GET") {
    return res.status(405).json({ error: "Nur GET Methode erlaubt" });
  }

  connection.query(`
    SELECT 
      ld.idLD,
      dp.idDP,
      dp.name AS Na,
      dp.value AS Val,
      dp.unit AS Unit,
      mg.name AS Gr,
      ld.idLocation,
      area.Name AS Area_Name
    FROM location_device as ld
    LEFT JOIN location_coordinates AS co ON ld.idLocation = co.idLocation and co.idMaps = ${idMap}
    LEFT JOIN devices AS de ON de.idDevice = ld.idDevice
    LEFT JOIN datapoint AS dp ON ld.idLD = dp.idLD
    LEFT JOIN message_group AS mg ON dp.idmessage_group = mg.idmessage_group
    LEFT JOIN location AS loc ON ld.idLocation = loc.idLocation
    LEFT JOIN area AS area ON loc.idArea = area.idArea
    WHERE co.X > 0 AND dp.idmessage_group>0 AND length(dp.unit)> 0 AND length(dp.value)> 0
  `, (error, results) => {
    if (error) {
      console.error("Fehler beim Abrufen der gis_lines:", error);
      return res
        .status(500)
        .json({ error: "Fehler beim Abrufen der gis_lines" });
    }

    const response = {
        "Name": "Liste aller Messungen der Geraete",
        "Zeitstempel": new Date().toISOString(),
        "IdMap":idMap,
      "Statis": results.map((row) => ({
        IdLD: row.idLD,
        IdDP: row.idDP,
        Na: row.Na,
        Val: row.Val,
        Unit: row.Unit,
        Gr: row.Gr,
        IdLocation: row.IdLocation,
        Area_Name: row.Area_Name,
      })),
    };

    res.json(response);
  });
}