public async Task <Hashtable> ScrapePricesForProduct(string productName)
{
var similarity = 3000;
var bestSimilarityCoefficient = 3000;
var headingIndex = 0;
var configuration = Configuration.Default.WithDefaultLoader().WithCookies().WithMetaRefresh();
var context = BrowsingContext.New(configuration);
await context.OpenAsync(SearchUrlSelector + productName);
// get headings
productHeadings = context.Active.QuerySelectorAll(ProductHeadingSelector);
// get prices container
productPrices = context.Active.QuerySelectorAll(ProductPriceSelector);
// get product links
productLinks = context.Active.QuerySelectorAll(ProductLinkSelector);
for (int i = 0; i < productHeadings.Length; i++)
{
// just for testing
// Console.WriteLine(productHeadings[i].Text().ToLower());
similarity = StringSimilarity.ComputeLevenshteinDistance(productHeadings[i].Text().ToLower(), productName);
if (similarity < bestSimilarityCoefficient)
{
bestSimilarityCoefficient = similarity;
headingIndex = i;
}
}
Console.WriteLine("Amazon -------------");
Console.WriteLine("Amazon best similarity " + bestSimilarityCoefficient);
Console.WriteLine("Found product: " + productHeadings[headingIndex].Text() + "\n" + "price: " + productPrices[headingIndex].Text());
Console.WriteLine("");
// check if there is more than one price in the price element
var pricesCount = productPrices[headingIndex].TextContent.Count(x => x == '£');
if (pricesCount != 1)
{
// two prices
var formattedPrices = productPrices[headingIndex].TextContent.Replace('£', ' ').SplitWithTrimming('-').ToList();
var formattedPricesDouble = formattedPrices.Select(x => double.Parse(x)).ToList();
var pricesAverage = formattedPricesDouble.Average();
var anchorElement = (IHtmlAnchorElement)productLinks[headingIndex];
var link = anchorElement.Href;
return(new Hashtable
{
{ "Price", pricesAverage },
{ "Formatted Price", pricesAverage },
{ "Similarity", bestSimilarityCoefficient },
{ "Product Heading", productHeadings[headingIndex].Text() },
{ "Product Link", link }
});
}
// only one price
var formattedPrice = productPrices[headingIndex].TextContent.Replace('£', ' ');
var formattedPriceDouble = Convert.ToDouble(formattedPrice);
var anchorElementSinglePrice = (IHtmlAnchorElement)productLinks[headingIndex];
var linkSinglePrice = anchorElementSinglePrice.Href;
return(new Hashtable
{
{ "Price", productPrices[headingIndex].Text() },
{ "Formatted Price", formattedPrice },
{ "Similarity", bestSimilarityCoefficient },
{ "Product Heading", productHeadings[headingIndex].Text() },
{ "Product Link", linkSinglePrice }
});
}
public async Task <Hashtable> ScrapePricesForProduct(string productName)
{
var similarity = 3000;
var bestSimilarityCoefficient = 3000;
var headingIndex = 0;
var configuration = Configuration.Default.WithDefaultLoader().WithCookies().WithMetaRefresh();
var context = BrowsingContext.New(configuration);
var searchPath = SearchUrlSelector.Replace("{productPlaceHolder}", productName);
await context.OpenAsync(searchPath);
// get headings
productHeadings = context.Active.QuerySelectorAll(ProductHeadingSelector);
// get prices container
productPrices = context.Active.QuerySelectorAll(ProductPriceSelector);
// get product links
productLinks = context.Active.QuerySelectorAll(ProductLinkSelector);
// in case the url readdress to a single product page (no need to calculate string similarity as only one result in the page)
if (productHeadings.Length == 0 || productPrices.Length == 0)
{
var singleProductHeading = context.Active.QuerySelectorAll(".product-header__title");
var singleProductPrice = context.Active.QuerySelectorAll(".price--large");
var singleProductLink = context.Active.Url;
return(new Hashtable
{
{ "Price", singleProductPrice.FirstOrDefault().Text().Replace('£', ' ') },
{ "Formatted Price", singleProductPrice.FirstOrDefault().Text().Replace('£', ' ') },
{ "Product Link", singleProductLink },
{ "Product Heading", singleProductHeading.FirstOrDefault().Text() }
});
}
for (int i = 0; i < productHeadings.Length; i++)
{
similarity = StringSimilarity.ComputeLevenshteinDistance(productHeadings[i].Text().ToLower(), productName);
if (similarity < bestSimilarityCoefficient)
{
bestSimilarityCoefficient = similarity;
headingIndex = i;
}
}
Console.WriteLine("John Lewis -------------");
Console.WriteLine("John Lewis best similarity " + bestSimilarityCoefficient);
Console.WriteLine("Found product: " + productHeadings[headingIndex].Text() + "\n" + "price: " + productPrices[headingIndex].Text());
Console.WriteLine("");
// check if there is more than one price in the price element
var pricesCount = productPrices[headingIndex].TextContent.Count(x => x == '£');
if (pricesCount != 1)
{
// two prices
var formattedPrices = productPrices[headingIndex].TextContent.Replace('£', ' ').SplitWithTrimming('-').ToList();
var formattedPricesDouble = formattedPrices.Select(x => double.Parse(x)).ToList();
var pricesAverage = formattedPricesDouble.Average();
return(new Hashtable
{
{ "Price", pricesAverage },
{ "Formatted Price", pricesAverage },
{ "Similarity", bestSimilarityCoefficient },
{ "Product Heading", productHeadings[headingIndex].Text() },
{ "Product Link", "https://www.johnlewis.com" + productLinks[headingIndex].GetAttribute("href") }
});
}
// only one price
var formattedPrice = productPrices[headingIndex].TextContent.Replace('£', ' ');
var formattedPriceDouble = Convert.ToDouble(formattedPrice);
return(new Hashtable
{
{ "Price", productPrices[headingIndex].Text() },
{ "Formatted Price", formattedPrice },
{ "Similarity", bestSimilarityCoefficient },
{ "Product Heading", productHeadings[headingIndex].Text() },
{ "Product Link", "https://www.johnlewis.com" + productLinks[headingIndex].GetAttribute("href") }
});
}
