// src/services/newsletterService.js
const fs = require("fs").promises;
const path = require("path");

const filePath = path.join(__dirname, "../../data/newsletter-emails.json");

async function saveEmail(email) {
  try {
    // Ensure the directory exists
    await fs.mkdir(path.dirname(filePath), { recursive: true });

    let data = [];
    try {
      const file = await fs.readFile(filePath, "utf8");
      // Attempt to parse the file content
      data = JSON.parse(file);
    } catch (e) {
      // If file doesn't exist (ENOENT) or contains invalid JSON (SyntaxError),
      // we treat it as an empty array and proceed.
      // Other errors should still be re-thrown.
      if (e.code !== "ENOENT" && !(e instanceof SyntaxError)) {
        console.error("Failed to parse newsletter-emails.json:", e);
        throw e;
      }
      // If ENOENT or SyntaxError, 'data' remains an empty array, which is desired.
    }
    console.log("test");

    if (!data.includes(email)) {
      data.push(email);
      try {
        await fs.writeFile(filePath, JSON.stringify(data, null, 2));
      } catch (err) {
        console.error("writeFile failed:", err);
        throw err;
      }
    }
  } catch (err) {
    console.error("Failed to save email:", err);
    throw err;
  }
  console.log("test2");
}

module.exports = { saveEmail };