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exports.viewProduct = catchAsync(async (req, res, next) => {
  const productId = req.params.id;
  let data = {};
  let count = null
  // Validate the productId
  if (!isValidObjectId(productId)) {
    return res.status(400).json({ message: 'Invalid product ID' });
  }
  const pathsAndFields = [
    { path: 'subcategories', select: 'subcategory' },
    { path: 'categories', select: 'category' },
    { path: 'groups', select: 'group' },
    { path: 'brand', select: 'brand' },
    { path: 'offer', select: ['discount', 'status'] }
  ];
  // .populate(pathsAndFields).exec();
  const product = await Product.findById(productId).populate(pathsAndFields);
  if (!product) {
    return next(new AppError('product not found', 400));
  }
  if (product.isvariant == true) {
    const attributes = await VariantAttribute.find({ product: product._id });
    if (attributes.length < 1) {
      return next(new AppError('invalid visibility value', 400));
    }
    count = 3
    for (let prodvar_id of product.variants) {
      const prod = await ProductVariant.findById(prodvar_id).populate({
        path: 'attributevalues',
        populate: { path: 'attribute' }
      });
      let obj = data;
      for (let i = 0; i < attributes.length; i++) {
        for (let k = 0; k < prod.attributevalues.length; k++) {
          if (String(attributes[i]._id) == String(prod.attributevalues[k].attribute._id)) {
            if (obj.id) {
              if (!obj.values[prod.attributevalues[k].value.toString()]) {
                obj.values[prod.attributevalues[k].value.toString()] = {};
              }
            } else {
              obj.id = prod.attributevalues[k].attribute._id;
              obj.name = prod.attributevalues[k].attribute.attributeName;
              obj.values = {};
              obj.values[prod.attributevalues[k].value.toString()] = {};
            }

            if (i == attributes.length - 1) {
              obj.values[prod.attributevalues[k].value.toString()] = {};
              obj.values[prod.attributevalues[k].value.toString()] = prod;
            } else {
              obj = obj.values[prod.attributevalues[k].value.toString()];
            }
          }
        }
      }
    }
  }
  const result = {};
  result.product = product;
  if (product.isvariant == true) {
    result.variant = data;
    result.count = count;
  }

  res.status(200).json({ message: 'Product fetched successfully', data: result });
});