// /pages/api/cpl/updateKueDataAPIHandler.ts
import { NextApiRequest, NextApiResponse } from "next";
import path from "path";
import fs from "fs/promises";

export default async function handler(
  req: NextApiRequest,
  res: NextApiResponse
) {
  if (req.method !== "POST") {
    return res.status(405).json({ error: "Method not allowed" });
  }

  const { slot, changes } = req.body;

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

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

  try {
    let fileContent = await fs.readFile(filePath, "utf-8");

    for (const [varName, value] of Object.entries(changes)) {
      const regex = new RegExp(
        `(var\\s+${varName}\\s*=\\s*\\[)([^\\]]*)(\\])`,
        "m"
      );

      const match = fileContent.match(regex);
      if (match) {
        const values = match[2].split(",").map((v) => v.trim());
        values[slot] = JSON.stringify(value); // korrektes Format: z. B. `"FTZ_2"` oder `10.5`
        const updatedArray = `${match[1]} ${values.join(", ")} ${match[3]}`;
        fileContent = fileContent.replace(regex, updatedArray);
      }
    }

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

    res.status(200).json({ success: true });
  } catch (error) {
    console.error("Fehler beim Schreiben der Datei:", error);
    res.status(500).json({ error: "Failed to write file" });
  }
}