const express = require("express");
const router = express.Router();
const path = require("path");
const fs = require("fs");
const defineAttachment = require("../../models/attachments");
const { DataTypes } = require("sequelize");

module.exports = function (sequelize) {
  const Attachment = defineAttachment(sequelize, DataTypes);

  router.delete("/:attachmentId", async (req, res) => {
    const attachmentId = req.params.attachmentId;
    const t = await sequelize.transaction();

    try {
      const attachment = await Attachment.findByPk(attachmentId);
      if (!attachment) {
        await t.rollback();
        return res.status(404).send("Attachment not found");
      }

      // delete file from folder
      const uploadDir = path.join(__dirname, "../../public");
      const url = attachment.path;
      const parts = url.split('/');
      const fileNameWithFolder = parts.slice(-2).join('/');
      const filePath = path.join(uploadDir, fileNameWithFolder);
      fs.unlink(filePath, (err) => {
        if (err) {
          console.error('Error deleting file:', err);
          t.rollback();
          return res.status(404).send("Attachment not found");
        }
      });

      await attachment.destroy({ transaction: t });
      await t.commit();
      res.status(204).send();
    } catch (error) {
      console.error(error);
      await t.rollback();
      res.status(500).send("Internal Server Error");
    }
  });

  return router;
};