export default async (key, newValue) => {
  const envFile = Bun.file(`.env`);
  let content = "";

  // 1. Read existing file if it exists
  if (await envFile.exists()) {
    content = await envFile.text();
  }

  const lines = content.split("\n");
  let keyFound = false;

  // Format the value: wrap in quotes if it contains spaces
  const safeValue = newValue.includes(" ") ? `"${newValue}"` : newValue;

  // 2. Scan lines to find and replace the key
  for (let i = 0; i < lines.length; i++) {
    const line = lines[i];
    
    // Regex matches the key at the start of the line (ignoring leading spaces)
    const keyRegex = new RegExp(`^\\s*${key}\\s*=`);
    
    if (keyRegex.test(line)) {
      lines[i] = `${key}=${safeValue}`;
      keyFound = true;
      break;
    }
  }

  // 3. If the key wasn't found, append it to the end
  if (!keyFound) {
    // Prevent appending to the same line if the file didn't end with a newline
    if (lines.length > 0 && lines[lines.length - 1] !== "") {
        lines.push(""); 
    }
    lines.push(`${key}=${safeValue}`);
  }

  // 4. Write the updated content back to the file
  await Bun.write(`.env`, lines.join("\n"));

  // 5. Update the live process environment so your app can use it immediately
  process.env[key] = newValue;

//   console.log(`✅ Set ${key} to newly updated value in ${ENV_PATH}`);
}