import sql from "mssql";

// --- SQL-Server-Anbindung (WAWIS), siehe .env.example ---
const sqlConfig = {
    server: process.env.DB_SERVER || "192.168.1.16",
    port: Number(process.env.DB_PORT) || 1433,
    database: process.env.DB_DATABASE || "wawis",
    user: process.env.DB_USER || "report",
    password: process.env.DB_PASSWORD || "",
    options: {
        encrypt: false,
        trustServerCertificate: true,
    },
};

let poolPromise;

function getPool() {
    if (!poolPromise) {
        poolPromise = new sql.ConnectionPool(sqlConfig).connect().catch((error) => {
            poolPromise = undefined;
            throw error;
        });
    }
    return poolPromise;
}

// Nur lesender Zugriff (SELECT) - der SQL-Server wird von diesem Portal nie beschrieben.
// gesperrt/inaktiv kommt aus T kunzu als Text ('ja'/'nein')
const CUSTOMERS_QUERY = `
SELECT
  kunde.debez
, kunde.debnr
, kunde.kg_id as kg_id
, kunde.kugru as kugru
, sydat as sydat
, datlv as datlv
, fibuk as fibuk
, kunde.ku_id as ku_id
, RTRIM(bsper) as bsper
, RTRIM(baktiv) as baktiv
FROM kunde
INNER JOIN kunzu ON kunzu.ku_id = kunde.ku_id
`;

export async function fetchCustomersFromSql() {
    const pool = await getPool();
    const result = await pool.request().query(CUSTOMERS_QUERY);
    console.log(result);
    return result.recordset;
}