const sharp = require("sharp");
const s3Storage = require("./s3Storage");

const ELECTION_IMAGE_PREFIX = "uploads/images/election";

const getStoredImageName = (doc, field) =>
  doc.get(field, null, { getters: false });

const deleteElectionImage = async (fileName) => {
  if (!fileName) return;

  try {
    await s3Storage.deleteObject(`${ELECTION_IMAGE_PREFIX}/${fileName}`);
  } catch (error) {
    console.log(`Failed to delete election image from S3:`, error?.message);
  }
};

const deleteCandidateImage = async (candidate) => {
  const fileName = getStoredImageName(candidate, "profilePic");
  await deleteElectionImage(fileName);
};

const deleteElectionCandidateImages = async (election) => {
  for (const candidate of election.candidates) {
    await deleteCandidateImage(candidate);
  }
};

const uploadProcessedImage = async (
  imageData,
  imageName,
  width,
  height,
  quality
) => {
  const buffer = await sharp(imageData)
    .resize(width, height, { fit: "cover" })
    .jpeg({ quality })
    .toBuffer();

  await s3Storage.uploadBuffer(
    `${ELECTION_IMAGE_PREFIX}/${imageName}`,
    buffer,
    "image/jpeg"
  );

  return imageName;
};

module.exports = {
  ELECTION_IMAGE_PREFIX,
  getStoredImageName,
  deleteElectionImage,
  deleteCandidateImage,
  deleteElectionCandidateImages,
  uploadProcessedImage,
};