/* This sample demonstrates use of the PowerTCP TCP Component in the ASP.NET environment.
 * This sample gets a page from Yahoo's stock service, passing a querystring in the request.
 * Yahoo uses this querystring to render information about the stock symbol in the response.
 * This response is then parsed to obtain the stock value
 */

using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;

namespace TcpStockQuote
{
	/// <summary>
	/// Summary description for WebForm1.
	/// </summary>
	public class WebForm1 : System.Web.UI.Page
	{
		protected System.Web.UI.WebControls.TextBox txtSymbol;
		protected System.Web.UI.WebControls.Button cmdGetQuote;
		protected System.Web.UI.WebControls.TextBox txtResults;

		protected DartSock.Tcp Tcp1 = new DartSock.TcpClass(); 
	
		public WebForm1()
		{
			Page.Init += new System.EventHandler(Page_Init);
		}

		private void Page_Load(object sender, System.EventArgs e)
		{
			// Put user code to initialize the page here
		}

		private void Page_Init(object sender, EventArgs e)
		{
			//
			// CODEGEN: This call is required by the ASP.NET Web Form Designer.
			//
			InitializeComponent();
		}

		#region Web Form Designer generated code
		/// <summary>
		/// Required method for Designer support - do not modify
		/// the contents of this method with the code editor.
		/// </summary>
		private void InitializeComponent()
		{    
			this.cmdGetQuote.Click += new System.EventHandler(this.cmdGetQuote_Click);
			this.Load += new System.EventHandler(this.Page_Load);

		}
		#endregion

		private void cmdGetQuote_Click(object sender, System.EventArgs e)
		{
			// first retrieve the page, then parse the results
			string page = "";
			if(GetPage(txtSymbol.Text, ref page))
			{
				txtResults.Text = ParsePage(page, txtSymbol.Text);
			}
		}

		private bool GetPage(string Symbol, ref string page)
		{
			Tcp1.Timeout = 5000;
			bool connected = false;
			bool success = false;
			try
			{
				// make an HTTP connection
				Tcp1.Connect("finance.yahoo.com", 80, "", 0);
				connected = true;
			}
			catch(Exception ConnectError)
			{
				txtResults.Text = "Connect Error: " + ConnectError.Message;
			}
			if(connected)
			{
				object data = new Object();

				// request the page, passing the symbol in the querystring
				data = "GET /q?s=" + Symbol + "&d=v1 HTTP/1.0" + "\r\n" + "\r\n";
				try
				{
					Tcp1.Send(ref data, 0, false);
					object header = new Object();
					object token = new Object();

					// header comes first
					header = "";
					token = "\r\n" + "\r\n";
					Tcp1.Search(ref header, ref token);
					data = "";
					// keep receiving data until the connection is closed
					do
					{
						Tcp1.Receive(ref data);
						page = page + data.ToString();
					}
					while(Tcp1.State != 0);
					success=true;

				}
				catch(Exception SendError)
				{
					txtResults.Text = "Error: " + SendError.Message;
				}
			}
			return success;
		}

		private string ParsePage(string page, string symbol)
		{
			// parse the page to get the quote
			string token = "";
			string results = "";
			int pos1;
			int pos2;
			bool changeup=false;

			// Look for direction image
            if(page.IndexOf("up_g.gif") > -1)
                changeup = true;
            
			token = "<td height=\"30\" class=\"ygtb\"><b>";
			pos1 = page.IndexOf(token);
			if(pos1 > -1)
			{
				pos1 = pos1 + token.Length;
				pos2 = page.IndexOf("<", pos1);
				results += "Company: " + page.Substring(pos1, pos2 - pos1) + "\r\n";
				token = "Last Trade:</td><td class=\"yfnc_tabledata1\"><big><b>";
				pos1 = page.IndexOf(token);
				if(pos1 > -1)
				{
					pos1 = pos1 + token.Length;
					pos2 = page.IndexOf("<", pos1);
					results += "Last Trade: " + page.Substring(pos1, pos2 - pos1) + "\r\n";
					token = "Change:</td>";
					pos1 = page.IndexOf(token);
					if(pos1 > -1)
					{
						pos1 = pos1 + token.Length;
						token = ";\">";
						pos1 = page.IndexOf(token, pos1);
						if(pos1 > -1)
						{
							pos1 = pos1 + token.Length;
							pos2 = page.IndexOf("<", pos1);
							results += "Change: ";
							if(changeup)
								results += "+";
							else
								results += "-";
							results += page.Substring(pos1, pos2 - pos1) + "\r\n";					
						}
						else
							results += "Error: change info not found.";				
					}
					else
						results += "Error: change info not found.";				
				}
				else
					results += "Error: trade info not found.";
			}
			else
				results += "Error: company not found.";

			return results;
		}

	}
}