import mysql from "mysql2";
import dotenv from "dotenv";
dotenv.config();

// Ein einzelner Pool reicht; der zweite Pool benutzte fälschlich DB_TABLE als Datenbank
const pool = mysql
  .createPool({
    host: process.env.DB_HOST,
    user: process.env.DB_USER,
    password: process.env.DB_PASSWORD,
    database: process.env.DB_NAME,
  })
  .promise();

export async function query(params) {
  const [result] = await pool.query(
    "UPDATE lose SET vorname = ?, nachname = ?, adresse = ?, plz = ?, email = ? WHERE losnummer = ? AND vorname IS NULL AND nachname IS NULL AND adresse IS NULL AND plz IS NULL AND email IS NULL",
    [
      params.vorname,
      params.nachname,
      params.adresse,
      params.plz,
      params.email,
      params.losnummer,
    ]
  );

  if (result.affectedRows > 0) {
    console.log("Update successful:", result);
    return { success: true };
  } else {
    return { success: false };
  }
}

export async function loginAdmin(username, password) {
  const [rows] = await pool.query(
    "SELECT * FROM admin_user WHERE username = ? AND password = ?",
    [username, password]
  );
  if (rows.length > 0) return { success: true };
  return { success: false };
}

export async function getTableData() {
  const [result] = await pool.query("SELECT * FROM lose");

  if (result.length > 0) {
    return { success: true, data: result };
  }
  return { success: false };
}

export async function createEntry(data) {
  if (!Array.isArray(data) || data.length === 0) return true;

  // Normalize values to strings and unique them to reduce duplicates
  const values = Array.from(
    new Set(data.map((v) => String(v).trim()).filter(Boolean))
  );

  // Prepare bulk insert values [[v1],[v2],...]
  const rows = values.map((v) => [v]);

  try {
    // Use INSERT IGNORE to skip duplicates on UNIQUE(losnummer)
    const [result] = await pool.query(
      "INSERT IGNORE INTO lose (losnummer) VALUES ?",
      [rows]
    );
    // result.affectedRows may be less than rows.length if duplicates existed
    return true;
  } catch (e) {
    console.error("Bulk insert failed", e);
    return false;
  }
}

export async function removeEntries(losnummern) {
  let { status } = { status: true };

  for (const losnummer of losnummern) {
    const [result] = await pool.query("DELETE FROM lose WHERE losnummer = ?", [
      losnummer,
    ]);

    if (result.affectedRows > 0) {
      status = true;
    } else {
      status = false;
      break;
    }
  }

  return status;
}

export async function saveRow(payload) {
  const [result] = await pool.query(
    "UPDATE lose SET vorname = ?, nachname = ?, adresse = ?, plz = ?, email = ? WHERE losnummer = ?",
    [
      payload.vorname,
      payload.nachname,
      payload.adresse,
      payload.plz,
      payload.email,
      payload.losnummer,
    ]
  );

  if (result.affectedRows > 0) {
    return { success: true };
  } else {
    return { success: false };
  }
}