using HtmlAgilityPack;
using Newsbot.Collector.Domain.Exceptions;

namespace Newsbot.Collector.Services.HtmlParser;

public class HtmlPageReader
{

    public HtmlData Data { get; set; }

    private HeadParserClient _headClient;

    private string _siteContent;

    public HtmlPageReader(string pageUrl)
    {
        _siteContent = ReadSiteContent(pageUrl);
        _headClient = new HeadParserClient(_siteContent);

        Data = new HtmlData();
    }

    public void Parse()
    {
        _headClient.Parse();
        Data.Header = _headClient.Data;
    }

    private string ReadSiteContent(string url)
    {
        using var client = new HttpClient();
        var html = client.GetStringAsync(url);
        html.Wait();

        var content = html.Result.ToString();
        return content;
    }

    public string GetSiteContent()
    {
        return _siteContent;
    }

    public List<HtmlNode> CollectPostContent()
    {
        var htmlDoc = new HtmlDocument();
        htmlDoc.LoadHtml(_siteContent);
        var links = htmlDoc.DocumentNode.SelectNodes("//div[contains(@class, 'article-text')]").ToList();

        if (links.Count == 0)
        {
            throw new Exception("Unable to parse body.  Tag is unkown.");
        }

        if (links.Count >= 2)
        {
            throw new Exception("Too many results back for the body");
        }

        var content = new List<string>();
        foreach (var item in links[0].ChildNodes)
        {
            if (item.Name == "p")
            {
                content.Add(item.InnerText);
            }
        }

        return links;
    }
}