// /pages/api/talas5/webserviceMap/gisStationsMeasurementsSQL.js
import mysql from "mysql2/promise";

// Erstellen eines Verbindungspools anstelle einer einzelnen Verbindung
const pool = mysql.createPool({
  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,
  waitForConnections: true,
  connectionLimit: 10,
  queueLimit: 0,
});

export default async function handler(req, res) {
  const { idMap, idUser } = req.query;

  if (!idMap || !idUser) {
    return res.status(400).json({ error: "idMap and idUser are required" });
  }

  try {
    let onlySystem = -1;
    let districtCounter = 0;

    // Get onlySystem
    const [mapResult] = await pool.query("SELECT idsystem_typ FROM maps WHERE id = ?", [idMap]);
    if (mapResult.length > 0) {
      onlySystem = mapResult[0].idsystem_typ ?? -1;
    }

    // Get districtCounter
    if (idUser > 0) {
      const [userLayerResult] = await pool.query("SELECT count(*) as count FROM user_User_layer1 WHERE iduser = ?", [idUser]);
      districtCounter = userLayerResult[0].count;
    }

    // Building the query
    let query = `
      SELECT ld.idLD, dc.message, p.level, p.name, p.color, ld.idDevice, de.isService, dc.idIcon
      FROM location as l
      LEFT JOIN location_coordinates AS co ON l.idLocation = co.idLocation and co.idMaps = ?
      LEFT JOIN location_device AS ld ON ld.idLocation = l.idLocation
      LEFT JOIN datapoint as d ON d.idLD = ld.idLD
      LEFT JOIN datapoint_conditions AS dc ON dc.idcondition = d.last_message_condition
      LEFT JOIN prio AS p ON p.idPrio = dc.idprio
      LEFT JOIN devices AS de ON de.idDevice = ld.idDevice
      LEFT JOIN area as a on a.idArea = l.idArea
      WHERE p.level < 100 AND co.X > 0
    `;

    const queryParams = [idMap];
    if (districtCounter > 0) {
      query += ` AND a.iddistrict IN (SELECT iddistrict FROM user_user_layer1 WHERE iduser = ?)`;
      queryParams.push(idUser);
    }
    if (onlySystem >= 0) {
      query += ` AND de.idsystem_typ = ?`;
      queryParams.push(onlySystem);
    }
    query += ` ORDER BY p.level desc`;

    const [results] = await pool.query(query, queryParams);

    const mpss = {
      IdMap: idMap.toString(),
      Statis: results.map((row) => ({
        IdLD: row.idLD ?? -1,
        Le: row.level ?? -1,
        Me: row.message ?? "?",
        Na: row.name ?? "?",
        Co: row.color ?? "#ffffff",
        Feld: row.idDevice ?? -1,
        Icon: row.idIcon ?? 0,
      })),
    };

    res.status(200).json(mpss);
  } catch (error) {
    console.error("Fehler beim Laden der Daten:", error);
    res.status(500).json({ error: "Interner Serverfehler" });
  }
}