using AngleSharp;
using AngleSharp.Dom;
using AngleSharp.Html.Dom;
using AngleSharp.Html.Parser;
using AngleSharp.Text;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Net.Http;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace OceanNetWorks
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private string Title { get; set; }
        private string Url { get; set; }
        private string siteUrl = "https://www.oceannetworks.ca/news/stories";
        //private string siteUrlx = "https://www.finansportalen.se/aktiekurser/";
        public string[] QueryTerms { get; } = { "Ocean", "Nature", "Pollution" };



        internal async void ScrapeWebsite()
        {
            //var config = Configuration.Default
            // .WithJs(); // from AngleSharp.Js
            //var context = BrowsingContext.New(config);            
            
            CancellationTokenSource cancellationToken = new CancellationTokenSource();
            HttpClient httpClient = new HttpClient();
            HttpResponseMessage request = await httpClient.GetAsync(siteUrl);

            cancellationToken.Token.ThrowIfCancellationRequested();

            Stream response = await request.Content.ReadAsStreamAsync();
            cancellationToken.Token.ThrowIfCancellationRequested();

            HtmlParser parser = new HtmlParser();

            IHtmlDocument document = parser.ParseDocument(response);

            GetScrapeResults(document);
        }

        private void GetScrapeResults(IHtmlDocument document)
        {
            IEnumerable<IElement> articleLink = null;

            foreach (var term in QueryTerms)
            {
                articleLink = document.All.Where(x =>
                x.ClassName == "views-field views-field-nothing" &&
                (x.ParentElement.InnerHtml.Contains(term) || x.ParentElement.InnerHtml.Contains(term.ToLower())));
            }

            if (articleLink.Any())
            {
                PrintResults(articleLink);
            }
        }

        public void PrintResults(IEnumerable<IElement> articleLink)
        {
            // Clean Up Results: See Next Step
            foreach (var element in articleLink)
            {
                CleanUpResults(element);
                scraperBox.Text = $"{Title} - {Url}{Environment.NewLine}";
            }
        }

        private void CleanUpResults(IElement result)
        {
            string htmlResult = result.InnerHtml.ReplaceFirst("        <span class=\"field-content\"><div><a href=\"", "https://www.oceannetworks.ca");
            htmlResult = htmlResult.ReplaceFirst("\">", "*");
            htmlResult = htmlResult.ReplaceFirst("</a></div>\n<div class=\"article-title-top\">", "-");
            htmlResult = htmlResult.ReplaceFirst("</div>\n<hr></span>  ", "");

            SplitResults(htmlResult);
        }

        private void SplitResults(string htmlResult)
        {
            string[] splitResults = htmlResult.Split('*');
            Url = splitResults[0];
            Title = splitResults[1];
        }

        private void btnScrape_Click(object sender, EventArgs e)
        {
            ScrapeWebsite();
        }
    }
}