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

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

  const mode = process.env.NEXT_PUBLIC_CPL_MODE;
  const updates = req.body.updates;

  if (!Array.isArray(updates)) {
    return res.status(400).json({ error: "Missing or invalid updates array" });
  }

  if (mode === "json") {
    const filePath = path.join(
      process.cwd(),
      "mocks/api/SERVICE/analogInputsMockData.json"
    );
    const content = fs.readFileSync(filePath, "utf-8");
    const data = JSON.parse(content);

    for (const update of updates) {
      const { key, index, value } = update;
      if (Array.isArray(data[key]) && index < data[key].length) {
        data[key][index] = value;
      }
    }

    fs.writeFileSync(filePath, JSON.stringify(data, null, 2), "utf-8");
    return res.status(200).json({ success: true });
  }

  if (mode === "jsSimulatedProd") {
    const filePath = path.join(
      process.cwd(),
      "mocks/device-cgi-simulator/SERVICE/analogInputsMockData.js"
    );
    let content = fs.readFileSync(filePath, "utf-8");

    for (const update of updates) {
      const { key, index, value } = update;
      const regex = new RegExp(`var\\s+${key}\\s*=\\s*\\[([\\s\\S]*?)\\];`);
      const match = content.match(regex);
      if (!match) continue;

      const items = match[1].split(",").map((s) => s.trim());
      if (index >= items.length) continue;

      const isString = typeof value === "string";
      items[index] = isString ? `"${value}"` : `${value}`;

      const updatedLine = `var ${key} = [${items.join(", ")}];`;
      content = content.replace(regex, updatedLine);
    }

    fs.writeFileSync(filePath, content, "utf-8");
    return res.status(200).json({ success: true });
  }

  return res.status(400).json({ error: "Unsupported mode" });
}