using System.Text;
using HtmlAgilityPack;

namespace NewsArchival.Scraper.Validation;

public class Advertisement
{
    public static string Strip(string htmlContent)
    {
        try
        {
            if (string.IsNullOrWhiteSpace(htmlContent)) return htmlContent;

            var doc = new HtmlDocument();
            doc.LoadHtml(htmlContent);
            
            var xpath = "//p | //a | //*[starts-with(name(), 'h') and string-length(name()) = 2]";
            var nodesToKeep = doc.DocumentNode.SelectNodes(xpath);
            if (nodesToKeep is null) return string.Empty;

            var sb = new StringBuilder();
            foreach (var node in nodesToKeep)
            {
                // Get the text, trim whitespace, and add a newline for readability
                string text = HtmlEntity.DeEntitize(node.InnerText).Trim();
                if (!string.IsNullOrWhiteSpace(text))
                {
                    sb.AppendLine(text);
                    sb.AppendLine(); // Adds spacing between paragraphs/headers
                }
            }

            return sb.ToString().Trim();
        }
        catch (Exception e)
        {
            Console.WriteLine(e);
            throw;
        }
    }
}