// /pages/api/cpl/updateTdrSettingsDataAPIHandler.ts

import path from "path";
import fs from "fs/promises";

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

  if (slot === undefined || value === undefined) {
    return res.status(400).json({ error: "Missing slot or value" });
  }

  const key = "win_tdrActive";
  const filePath = path.join(
    process.cwd(),
    "apiMockData/SERVICE/kabelueberwachungMockData.js"
  );

  try {
    const fileContent = await fs.readFile(filePath, "utf-8");
    const regex = new RegExp(`(var\\s+${key}\\s*=\\s*\\[)([^\\]]*)(\\])`);
    const match = fileContent.match(regex);

    if (!match) {
      return res
        .status(404)
        .json({ error: `Key "${key}" not found in mock data.` });
    }

    const values = match[2].split(",").map((v) => v.trim());
    values[Number(slot)] = value;

    // Optional: Entferne leere Einträge
    while (values.length > 0 && !values[values.length - 1]) values.pop();

    const newArray = `var ${key} = [\n  ${values.join(", ")}\n];`;
    const updated = fileContent.replace(regex, newArray);

    await fs.writeFile(filePath, updated, "utf-8");

    return res.status(200).json({ success: true, slot, value });
  } catch (err) {
    console.error("API error:", err);
    return res.status(500).json({ error: "Internal server error." });
  }
}