using CsvHelper;
using HtmlAgilityPack;
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Diagnostics;
using System.Globalization;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Web;

namespace WpfScraper
{
    public class Scraper
    {
        private ObservableCollection<EntryModel> _entries = new ObservableCollection<EntryModel>();

        public ObservableCollection<EntryModel> Entries
        {
            get { return _entries; }
            set { _entries = value; }
        }

        public void ScrapeData(string page)
        {
            var web = new HtmlWeb();
            var doc = web.Load(page);

            //var Articles = doc.DocumentNode.SelectNodes("//*[@class = 'article-single']");
            var Articles = doc.DocumentNode.SelectNodes("//*[@id='shareslist']/table/tbody/tr[1]");

            foreach (var article in Articles)
            {
                //var header = HttpUtility.HtmlDecode(article.SelectSingleNode(".//li[@class = 'article-header']").InnerText);
                //var description = HttpUtility.HtmlDecode(article.SelectSingleNode(".//li[@class = 'article-copy']").InnerText);
                var header = HttpUtility.HtmlDecode(article.SelectSingleNode(".//li[@class = 'millistream-link']").InnerText);
                var description = HttpUtility.HtmlDecode(article.SelectSingleNode(".//li[@class = 'millistream-numeric millistream-lastprice millistream-numeric-positive']").InnerText);
                Debug.Print($"Title: {header} \n"+
                    $" Description: {description}");
                _entries.Add(new EntryModel { Title = header, Description = description });
            }
        }

        public void Export()
        {
            using(TextWriter tw = File.CreateText("SampleData.csv"))
            {
                using(var cw = new CsvWriter(tw,CultureInfo.InvariantCulture))
                {
                    foreach(var entry in Entries)
                    {
                        cw.WriteRecord(entry);
                        cw.NextRecord();
                    }
                }
            }
        }
    }
}