using System;
using System.Web;
using System.Net;
using System.IO;
using System.Collections;


namespace MyVirtualEarth.V2
{
	public class RoutePoint
	{
		public string instruction;
		public decimal lat;
		public decimal lon;
	}

	public class Directions : System.Web.UI.Page
	{
		private string startLat;
		private string startLon;
		private string endLat;
		private string endLon;
		private ArrayList routePoints;

		private void Page_Load(object sender, System.EventArgs e)
		{
			if(Request["startLon"] != null
				&& Request["startLat"] != null
				&& Request["endLon"] != null
				&& Request["endLat"] != null
				)
			{
				Response.Clear();


				startLat = Request["startLat"];
				startLon = Request["startLon"];
				endLat =   Request["endLat"];
				endLon =   Request["endLon"];

				string directions = GetDirections();
				
				routePoints = GetRoutePoints(directions);
				
				foreach(RoutePoint routePt in routePoints)
				{
					Response.Write(routePt.instruction  + "<br/>");
					Response.Write("Lat: "+ routePt.lat.ToString() +"<br/>");
					Response.Write("Lon: "+ routePt.lon.ToString() +"<br/>");
				}
			}
		}

		private ArrayList GetRoutePoints(string directions)
		{
			routePoints = new ArrayList();
			// look for new VE_RouteInstruction(
			string routePtStart = "new VE_RouteInstruction('";
			int currentIndex = 0;
				
			do
			{
				currentIndex = directions.IndexOf(routePtStart, currentIndex);
				if (currentIndex!=-1)
				{
					RoutePoint routePt = new RoutePoint();
 
					int startIndex = currentIndex+routePtStart.Length;
					int endIndex = directions.IndexOf("'",startIndex);
					routePt.instruction = directions.Substring(startIndex, endIndex - startIndex);
											
					startIndex = directions.IndexOf(',', endIndex);
					startIndex++;
					endIndex = directions.IndexOf(',', startIndex);
					routePt.lat = decimal.Parse(directions.Substring(startIndex, endIndex-startIndex));
						
					startIndex = directions.IndexOf(',', endIndex);
					startIndex++;
					endIndex = directions.IndexOf(',', startIndex);
					routePt.lon = decimal.Parse(directions.Substring(startIndex, endIndex-startIndex));
					
					routePoints.Add(routePt);
					currentIndex = endIndex;
				}
			}while(currentIndex >0);

			return routePoints;
		
		}

		private string BuildParams()
		{
			string dirParams = string.Empty;
			dirParams += "&startlat=" + startLat + "&startlon=" + startLon;
			dirParams += "&endlat=" + endLat + "&endlon=" + endLon;
			return dirParams;
		}

		private HttpWebRequest CreateDirectionsRequest()
		{
			HttpWebRequest dirRequest =
				(HttpWebRequest)
				WebRequest.Create(
				"http://local.live.com/directions.ashx");
            
			dirRequest.Method = "POST";
			dirRequest.ServicePoint.Expect100Continue = false; 

			dirRequest.ContentType = "application/x-www-form-urlencoded";
            
			return dirRequest;
		}

		private string GetDirectionResults(HttpWebRequest dirRequest)
		{
			string results = string.Empty;
            
			HttpWebResponse dirResponse;

			dirResponse = 
				(HttpWebResponse)dirRequest.GetResponse();
            
			Stream receiveStream = dirResponse.GetResponseStream();
			System.Text.Encoding encode = System.Text.Encoding.GetEncoding("utf-8");
                
			StreamReader readStream = new StreamReader(receiveStream, encode);
                
			Char[] read = new Char[256];
			// Reads 256 characters at a time.    
			int count = readStream.Read( read, 0, 256 );
			while (count > 0) 
			{
				String str = new String(read, 0, count);
				results += str;
				count = readStream.Read(read, 0, 256);
			}
                
			dirResponse.Close();

			return results;
		}

		private string GetDirections()
		{
			string results = string.Empty;
            
			string dirParams = BuildParams();

			HttpWebRequest dirRequest = CreateDirectionsRequest();

			System.Text.UTF8Encoding encoding = new System.Text.UTF8Encoding();
			byte[] bytes = encoding.GetBytes(dirParams);

			dirRequest.ContentLength = bytes.Length;

			Stream requestStream = dirRequest.GetRequestStream(); 
			requestStream.Write(bytes, 0, bytes.Length);
			requestStream.Close(); 

			try
			{
				results = GetDirectionResults(dirRequest);
			}
			catch(Exception ex)
			{
				Console.Out.WriteLine(ex.Message);
			}
            
			return results;
		}

		#region Web Form Designer generated code
		override protected void OnInit(EventArgs e)
		{
			InitializeComponent();
			base.OnInit(e);
		}
		
		private void InitializeComponent()
		{    
			this.Load += new System.EventHandler(this.Page_Load);
		}
		#endregion
	}
}