using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Globalization;
using System.IO;
using System.Linq;
using System.Net;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace NewsCrawler
{
	public partial class Form1 : Form
	{
		class NEWS_ITEM
		{
			public string m_strTitle;
			public DateTime m_Time;
			public string m_strURL;
		}


		Timer m_Timer = new Timer();
		List<NEWS_ITEM> m_ItemList = new List<NEWS_ITEM>();

		public Form1()
		{
			InitializeComponent();

			m_Timer.Tick+=Timer_Tick;
			m_Timer.Interval=500;
			m_Timer.Start();
		}

		bool ReadAsiaE()
		{
			bool bHasNew = false;

			string strServerURL = "http://www.asiae.co.kr";
			WebRequest request = WebRequest.Create("http://www.asiae.co.kr/news/sokbo/sokbo_left.htm");
			request.Credentials=CredentialCache.DefaultCredentials;

			HttpWebResponse response = (HttpWebResponse)request.GetResponse();
			Console.WriteLine(response.StatusDescription);

			Stream dataStream = response.GetResponseStream();
			StreamReader reader = new StreamReader(dataStream, Encoding.GetEncoding("EUC-KR"));
			string responseFromServer = WebUtility.HtmlDecode(reader.ReadToEnd());

			HtmlAgilityPack.HtmlDocument doc = new HtmlAgilityPack.HtmlDocument();
			doc.LoadHtml(responseFromServer);
			string strXPath = "//div[contains(@class, 'txtform')]/ul/li";
			var lists = doc.DocumentNode.SelectNodes(strXPath);
			foreach(var item in lists)
			{
				string strTitle = item.SelectSingleNode(".//a").GetAttributeValue("title", "");
				string strTime = item.SelectSingleNode(".//span").InnerText;
				string strURL = strServerURL+item.SelectSingleNode(".//a").GetAttributeValue("href", "");

				if(m_ItemList.Any(c => c.m_strURL==strURL)==false)
				{
					NEWS_ITEM news = new NEWS_ITEM();
					news.m_strTitle=strTitle;
					news.m_Time=DateTime.ParseExact(strTime, "HH:mm", CultureInfo.CurrentCulture);
					news.m_strURL=strURL;

					m_ItemList.Add(news);

					bHasNew=true;
				}
			}

			reader.Close();
			dataStream.Close();
			response.Close();

			return bHasNew;
		}

		bool ReadEtoday()
		{
			bool bHasNew = false;

			string strServerURL = "http://www.etoday.co.kr";
			WebRequest request = WebRequest.Create("http://www.etoday.co.kr/news/flash/flash_list.php?tab=2");
			request.Credentials=CredentialCache.DefaultCredentials;

			HttpWebResponse response = (HttpWebResponse)request.GetResponse();
			Console.WriteLine(response.StatusDescription);

			Stream dataStream = response.GetResponseStream();
			StreamReader reader = new StreamReader(dataStream, Encoding.GetEncoding("utf-8"));
			string responseFromServer = WebUtility.HtmlDecode(reader.ReadToEnd());

			HtmlAgilityPack.HtmlDocument doc = new HtmlAgilityPack.HtmlDocument();
			doc.LoadHtml(responseFromServer);
			string strXPath = "//div[contains(@class, 'flash_tab_lst')]/ul/li";
			var lists = doc.DocumentNode.SelectNodes(strXPath);
			foreach(var item in lists)
			{
				string strTitle = item.SelectSingleNode(".//a").InnerText;
				string strTime = item.SelectSingleNode(".//span[contains(@class, 'flash_press')]").InnerText;
				string strURL = item.SelectSingleNode(".//a").GetAttributeValue("href", "");
				strURL = "http://www.etoday.co.kr/news/section/newsview.php?idxno="+Regex.Replace(strURL, @"\D", "");

				if(m_ItemList.Any(c => c.m_strURL==strURL)==false)
				{
					NEWS_ITEM news = new NEWS_ITEM();
					news.m_strTitle=strTitle;
					news.m_Time=DateTime.ParseExact(strTime, "HH:mm", CultureInfo.CurrentCulture);
					news.m_strURL=strURL;

					m_ItemList.Add(news);

					bHasNew=true;
				}
			}

			reader.Close();
			dataStream.Close();
			response.Close();

			return bHasNew;
		}

		private void Timer_Tick(object sender, EventArgs e)
		{
			bool bHasNew1 = ReadAsiaE();
			bool bHasNew2 = ReadEtoday();

			if(bHasNew1 ||bHasNew2)
			{
				m_ItemList.Sort((NEWS_ITEM news1, NEWS_ITEM news2) => news1.m_Time.CompareTo(news2.m_Time));

				foreach(var item in m_ItemList)
				{
					string strResult = string.Format("[{0}] {1} ({2})", item.m_Time, item.m_strTitle, item.m_strURL);
					Console.WriteLine(strResult);
					System.IO.File.AppendAllText("output.txt", strResult+"\n", Encoding.GetEncoding("EUC-KR"));
				}
			}


		}
	}
}