/* This sample demonstrates use of the PowerTCP WebASP 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;
using System.Diagnostics;

namespace HttpStockQuote
{
	/// <summary>
	/// Summary description for WebForm1.
	/// </summary>
	public class WebForm1 : System.Web.UI.Page
	{
		protected System.Web.UI.WebControls.Label Label1;
		protected System.Web.UI.WebControls.Button cmdGetQuote;
		protected System.Web.UI.WebControls.TextBox txtResult;
		protected System.Web.UI.WebControls.TextBox txtSymbol;

		// http control 
		protected DartWebASP.WebASP WebAsp1 = new DartWebASP.WebASPClass();
		
		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)
		{
			if(txtSymbol.Text == "")
				txtResult.Text = "Unable to retrieve quote, please enter a symbol.";
			else
			{
				// retrieve yahoo finance info, querystring tells yahho which symbol to grab
				WebAsp1.Request.Url = "http://finance.yahoo.com/q";
				WebAsp1.Request.UrlQueryString ="s=" + txtSymbol.Text + "&d=v1";
				try
				{
					WebAsp1.Get();
					txtResult.Text = ParsePage(WebAsp1.Response.Body.ReadString(0), txtSymbol.Text);
				}
				catch(Exception GetError)
				{
					txtResult.Text = "Get Error: " + GetError.Message;
				}
			}
		}
	
		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;
		}
	}
}