using System;
using System.Drawing;
using System.Windows.Forms;
using System.Net;
using System.Text;
using System.Text.RegularExpressions;
using System.IO;
using System.Threading;

namespace Scraping
{
	public class MainForm : System.Windows.Forms.Form
	{
		private System.Windows.Forms.TextBox tbDelay;
		private System.Windows.Forms.Button btnDownloadPdf;
		private System.Windows.Forms.StatusBarPanel statusPanel;
		private System.Windows.Forms.Label lAbBhf;
		private System.Windows.Forms.TextBox tbAnBhf;
		private System.Windows.Forms.GroupBox gbProperties;
		private System.Windows.Forms.TextBox tbAbBhf;
		private System.Windows.Forms.TextBox tbPdfAddr;
		private System.Windows.Forms.Label lID;
		private System.Windows.Forms.Label lAddr;
		private System.Windows.Forms.TextBox tbBeginn;
		private System.Windows.Forms.Label lAnBhf;
		private System.Windows.Forms.Label label1;
		private System.Windows.Forms.StatusBar statusBar;
		private System.Windows.Forms.Label lIdent;
		private System.Windows.Forms.Label lBeginn;
		
		private Thread t = null;
		
		public MainForm()
		{
			InitializeComponent();
			tbBeginn.Text = DateTime.Today.Date.Day.ToString()+"."+DateTime.Today.Date.Month.ToString()+"."+DateTime.Today.Date.Year.ToString();
		}
		
		[STAThread]
		public static void Main(string[] args)
		{
			Application.Run(new MainForm());
		}
		
		
		#region Windows Forms Designer generated code
		/// <summary>
		/// This method is required for Windows Forms designer support.
		/// Do not change the method contents inside the source code editor. The Forms designer might
		/// not be able to load this method if it was changed manually.
		/// </summary>
		private void InitializeComponent() {
			this.lBeginn = new System.Windows.Forms.Label();
			this.lIdent = new System.Windows.Forms.Label();
			this.statusBar = new System.Windows.Forms.StatusBar();
			this.label1 = new System.Windows.Forms.Label();
			this.lAnBhf = new System.Windows.Forms.Label();
			this.tbBeginn = new System.Windows.Forms.TextBox();
			this.lAddr = new System.Windows.Forms.Label();
			this.lID = new System.Windows.Forms.Label();
			this.tbPdfAddr = new System.Windows.Forms.TextBox();
			this.tbAbBhf = new System.Windows.Forms.TextBox();
			this.gbProperties = new System.Windows.Forms.GroupBox();
			this.tbAnBhf = new System.Windows.Forms.TextBox();
			this.lAbBhf = new System.Windows.Forms.Label();
			this.statusPanel = new System.Windows.Forms.StatusBarPanel();
			this.btnDownloadPdf = new System.Windows.Forms.Button();
			this.tbDelay = new System.Windows.Forms.TextBox();
			this.gbProperties.SuspendLayout();
			((System.ComponentModel.ISupportInitialize)(this.statusPanel)).BeginInit();
			this.SuspendLayout();
			// 
			// lBeginn
			// 
			this.lBeginn.Location = new System.Drawing.Point(16, 112);
			this.lBeginn.Name = "lBeginn";
			this.lBeginn.Size = new System.Drawing.Size(48, 16);
			this.lBeginn.TabIndex = 5;
			this.lBeginn.Text = "Beginn";
			// 
			// lIdent
			// 
			this.lIdent.Location = new System.Drawing.Point(256, 16);
			this.lIdent.Name = "lIdent";
			this.lIdent.Size = new System.Drawing.Size(256, 24);
			this.lIdent.TabIndex = 1;
			this.lIdent.Text = "Ident:";
			// 
			// statusBar
			// 
			this.statusBar.Location = new System.Drawing.Point(0, 247);
			this.statusBar.Name = "statusBar";
			this.statusBar.Panels.AddRange(new System.Windows.Forms.StatusBarPanel[] {
			                               	this.statusPanel});
			this.statusBar.ShowPanels = true;
			this.statusBar.Size = new System.Drawing.Size(520, 22);
			this.statusBar.TabIndex = 7;
			// 
			// label1
			// 
			this.label1.Location = new System.Drawing.Point(16, 152);
			this.label1.Name = "label1";
			this.label1.Size = new System.Drawing.Size(100, 32);
			this.label1.TabIndex = 7;
			this.label1.Text = "Wartezeit bis zur Pdf Abfrage in s";
			// 
			// lAnBhf
			// 
			this.lAnBhf.Location = new System.Drawing.Point(16, 80);
			this.lAnBhf.Name = "lAnBhf";
			this.lAnBhf.Size = new System.Drawing.Size(40, 16);
			this.lAnBhf.TabIndex = 3;
			this.lAnBhf.Text = "AnBhf";
			// 
			// tbBeginn
			// 
			this.tbBeginn.Location = new System.Drawing.Point(80, 112);
			this.tbBeginn.Name = "tbBeginn";
			this.tbBeginn.Size = new System.Drawing.Size(104, 20);
			this.tbBeginn.TabIndex = 6;
			this.tbBeginn.Text = "";
			// 
			// lAddr
			// 
			this.lAddr.Location = new System.Drawing.Point(256, 80);
			this.lAddr.Name = "lAddr";
			this.lAddr.Size = new System.Drawing.Size(40, 24);
			this.lAddr.TabIndex = 4;
			this.lAddr.Text = "Addr:";
			// 
			// lID
			// 
			this.lID.Location = new System.Drawing.Point(256, 48);
			this.lID.Name = "lID";
			this.lID.Size = new System.Drawing.Size(256, 23);
			this.lID.TabIndex = 2;
			this.lID.Text = "ID:";
			// 
			// tbPdfAddr
			// 
			this.tbPdfAddr.Location = new System.Drawing.Point(256, 104);
			this.tbPdfAddr.Multiline = true;
			this.tbPdfAddr.Name = "tbPdfAddr";
			this.tbPdfAddr.Size = new System.Drawing.Size(256, 48);
			this.tbPdfAddr.TabIndex = 5;
			this.tbPdfAddr.Text = "";
			// 
			// tbAbBhf
			// 
			this.tbAbBhf.Location = new System.Drawing.Point(80, 48);
			this.tbAbBhf.Name = "tbAbBhf";
			this.tbAbBhf.Size = new System.Drawing.Size(104, 20);
			this.tbAbBhf.TabIndex = 2;
			this.tbAbBhf.Text = "Salzwedel";
			// 
			// gbProperties
			// 
			this.gbProperties.Controls.Add(this.tbDelay);
			this.gbProperties.Controls.Add(this.label1);
			this.gbProperties.Controls.Add(this.tbBeginn);
			this.gbProperties.Controls.Add(this.lBeginn);
			this.gbProperties.Controls.Add(this.tbAnBhf);
			this.gbProperties.Controls.Add(this.lAnBhf);
			this.gbProperties.Controls.Add(this.tbAbBhf);
			this.gbProperties.Controls.Add(this.lAbBhf);
			this.gbProperties.Controls.Add(this.btnDownloadPdf);
			this.gbProperties.Location = new System.Drawing.Point(8, 8);
			this.gbProperties.Name = "gbProperties";
			this.gbProperties.Size = new System.Drawing.Size(232, 232);
			this.gbProperties.TabIndex = 6;
			this.gbProperties.TabStop = false;
			this.gbProperties.Text = "Einstellungen";
			// 
			// tbAnBhf
			// 
			this.tbAnBhf.Location = new System.Drawing.Point(80, 80);
			this.tbAnBhf.Name = "tbAnBhf";
			this.tbAnBhf.Size = new System.Drawing.Size(104, 20);
			this.tbAnBhf.TabIndex = 4;
			this.tbAnBhf.Text = "Stendal";
			// 
			// lAbBhf
			// 
			this.lAbBhf.Location = new System.Drawing.Point(16, 48);
			this.lAbBhf.Name = "lAbBhf";
			this.lAbBhf.Size = new System.Drawing.Size(40, 16);
			this.lAbBhf.TabIndex = 1;
			this.lAbBhf.Text = "AbBhf";
			// 
			// statusPanel
			// 
			this.statusPanel.Text = "Fertig";
			this.statusPanel.Width = 500;
			// 
			// btnDownloadPdf
			// 
			this.btnDownloadPdf.Location = new System.Drawing.Point(16, 192);
			this.btnDownloadPdf.Name = "btnDownloadPdf";
			this.btnDownloadPdf.Size = new System.Drawing.Size(96, 23);
			this.btnDownloadPdf.TabIndex = 0;
			this.btnDownloadPdf.Text = "DownloadPdf";
			this.btnDownloadPdf.Click += new System.EventHandler(this.BtnDownloadPdfClick);
			// 
			// tbDelay
			// 
			this.tbDelay.Location = new System.Drawing.Point(112, 152);
			this.tbDelay.Name = "tbDelay";
			this.tbDelay.TabIndex = 8;
			this.tbDelay.Text = "10";
			// 
			// MainForm
			// 
			this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
			this.ClientSize = new System.Drawing.Size(520, 269);
			this.Controls.Add(this.statusBar);
			this.Controls.Add(this.gbProperties);
			this.Controls.Add(this.tbPdfAddr);
			this.Controls.Add(this.lAddr);
			this.Controls.Add(this.lID);
			this.Controls.Add(this.lIdent);
			this.Name = "MainForm";
			this.Text = "MainForm";
			this.Closed += new System.EventHandler(this.MainFormClosed);
			this.gbProperties.ResumeLayout(false);
			((System.ComponentModel.ISupportInitialize)(this.statusPanel)).EndInit();
			this.ResumeLayout(false);
		}
		#endregion
		
		
		public void DownloadPdf()
		{
			//Request 1 (holt die aktuelle ident)
			
			statusPanel.Text = "(1/3) Create Request...";
			WebRequest wrq1 = WebRequest.Create("http://persoenlicherfahrplan.bahn.de/bin/pf/query-p2w.exe/dn?");
			
			//übernimmt die Proxy Einstellungen des IE!!!!!!!!!!!!!!!
			statusPanel.Text = "(1/3) Get Response...";
			HttpWebResponse wrp1 = (HttpWebResponse)wrq1.GetResponse();
			StreamReader sr1 = new StreamReader(wrp1.GetResponseStream(), Encoding.ASCII);
			StringBuilder sb1 = new StringBuilder();
			
			statusPanel.Text = "(1/3) Speichere Stream...";
			while (-1 != sr1.Peek()){
				sb1.Append(sr1.ReadLine());
			}
			
			statusPanel.Text = "(1/3) Search Expression...";
			Regex re1 = new Regex("<input type=\"hidden\" name=\"ident\" value=\"(?<1>\\S{20,22})\"",RegexOptions.IgnoreCase);
			Match m1 = re1.Match(sb1.ToString());
			
			wrp1.Close(); //Beenden der Verbindung nicht vergessen!!!
			
			if(m1.Success)
			{
				//Request 2 (setzt die in Request 1 geholte ident in die spezifische Abfrage ein und holt aus ihrer Rückgabe die 16-stellige ID der Abfrage)
				
				string strWrq2Address = "http://persoenlicherfahrplan.bahn.de/bin/pf/query-p2w.exe/dn?";
				strWrq2Address += "ident=" + m1.Groups[1].Captures[0] + "&seqnr=0&ignore_ident=1&pfmodus=1&transfertype=xml"; //Einsetzten der ident
				strWrq2Address += "&descfrom.-1=BASEREQ&majorfrom=BHF&from="+tbAbBhf.Text;
				strWrq2Address += "&descto.-1=BASEREQ&majorto=BHF&to="+tbAnBhf.Text;
				strWrq2Address += "&date_from="+tbBeginn.Text+"&date_to="+DateTime.Parse(tbBeginn.Text).AddDays(6).ToShortDateString();
				strWrq2Address += "&weekday_mo=checked&weekday_tu=checked&weekday_we=checked&weekday_th=checked&weekday_fr=checked&weekday_sa=checked&weekday_su=checked";
				strWrq2Address += "&timesel=depart&time=12%3A00&time0_from_hin=0%3A00&time0_to_hin=23%3A59&time0_from_rueck=0%3A00&time0_to_rueck=23%3A59";
				strWrq2Address += "&answerMode=download&eMailAddress=&output=pdf&maxNrOfChanges=0&pr1.4=CHECKED&outputFilter=complete&filter=&start.x=42&start.y=10";
				
				statusPanel.Text = "(2/3) Create Request...";
				WebRequest wrq2 = WebRequest.Create(strWrq2Address);
				//übernimmt die Proxy Einstellungen des IE!!!!!!!!!!!!!!!
				
				statusPanel.Text = "(2/3) Get Response...";
				WebResponse wrp2 = wrq2.GetResponse();
				StreamReader sr2 = new StreamReader(wrp2.GetResponseStream(), Encoding.ASCII);
				StringBuilder sb2 = new StringBuilder();
				
				statusPanel.Text = "(2/3) Speichere Stream...";
				while (-1 != sr2.Peek()){
					sb2.Append(sr2.ReadLine());
				}
				
				statusPanel.Text = "(2/3) Search Expression...";
				Regex re2 = new Regex("<a href=\"http://persoenlicherfahrplan.bahn.de/bin/pf/query-p2w.exe/dn\\?id=(?<1>\\S{4}.\\S{4}.\\S{4}.\\S{4})",RegexOptions.IgnoreCase);
				Match m2 = re2.Match(sb2.ToString());
				
				wrp2.Close(); //Beenden der Verbindung nicht vergessen!!!
				
				if(m2.Success)
				{
					//Request 3 (benutzt die ID aus Request 2 um die Adresse des PDFs zu holen)
					
					//Thread wartet i sekunden um die Pdf berechnen zu lassen
					for(int i = Convert.ToInt32(tbDelay.Text);i>=0;i--)
					{
						statusPanel.Text = "(3/3) Warte "+i.ToString()+" Sekunden...";
						Thread.Sleep(1000);
					}
					
					statusPanel.Text = "(3/3) Create Request...";
					WebRequest wrq3 = WebRequest.Create("http://persoenlicherfahrplan.bahn.de/bin/pf/query-p2w.exe/dn?id="+m2.Groups[1].Captures[0]);
					//übernimmt die Proxy Einstellungen des IE!!!!!!!!!!!!!!!
					
					statusPanel.Text = "(3/3) Get Response...";
					WebResponse wrp3 = wrq3.GetResponse();
					StreamReader sr3 = new StreamReader(wrp3.GetResponseStream(), Encoding.ASCII);
					StringBuilder sb3 = new StringBuilder();
					
					statusPanel.Text = "(3/3) Speichere Stream...";
					while (-1 != sr3.Peek()){
						sb3.Append(sr3.ReadLine());
					}
					
					statusPanel.Text = "(3/3) Search Expression...";
					Regex re3 = new Regex("<a href=\"(?<1>\\S{0,})\">",RegexOptions.IgnoreCase);
					Match m3 = re3.Match(sb3.ToString());
					
					wrp3.Close(); //Beenden der Verbindung nicht vergessen!!!
					
					if(m3.Success){
						//Bei Erfolg wird der Link ausgegeben
						lIdent.Text = "Ident: "+m1.Groups[1].Captures[0];
						lID.Text = "ID: "+m2.Groups[1].Captures[0];
						tbPdfAddr.Text = "http://persoenlicherfahrplan.bahn.de/bin/pf/query-p2w.exe/"+m3.Groups[1].Captures[0];
						
						statusPanel.Text = "Downloade Pdf...";
						WebClient wc = new WebClient();
						wc.DownloadFile(tbPdfAddr.Text, tbAbBhf.Text.ToUpper()+"-"+tbAnBhf.Text.ToUpper()+".pdf");
						
						statusPanel.Text = "Als "+tbAbBhf.Text.ToUpper()+"-"+tbAnBhf.Text.ToUpper()+".pdf gespeichert";
						btnDownloadPdf.Enabled = true;
						btnDownloadPdf.Text = "DownloadPdf";
					} else {
						MessageBox.Show("Request 3 fehlgeschlagen");
					}
				} else {
					//Schlägt die Abfrage der ID fehl, wird die ident ausgegeben.
					MessageBox.Show("ID Abfrage fehlgeschlagen! Ident:"+m1.Groups[1].Captures[0]);
				}
			} else {
				//Abfrage der ident schlägt fehl
				MessageBox.Show("Ident Abfrage fehlgeschlagen");
			}
		}
		
		
		void MainFormClosed(object sender, System.EventArgs e)
		{
			if(t!=null)
			{
				t.Abort();
			}
		}
		
		void BtnDownloadPdfClick(object sender, System.EventArgs e)
		{
			if(tbAbBhf.Text.Length!=0&&tbAnBhf.Text.Length!=0&&tbBeginn.Text.Length!=0&&tbDelay.Text.Length!=0)
			{
				btnDownloadPdf.Enabled = false;
				btnDownloadPdf.Text = "In Progress...";
				t = new Thread(new ThreadStart(DownloadPdf));
				t.Start();
			}
			else
			{
				ShowErrorMsg("Eingabefelder überprüfen!");
			}
		}
		
		void ShowErrorMsg(string msg)
		{
			MessageBox.Show(msg, "Fehler", MessageBoxButtons.OK, MessageBoxIcon.Hand, MessageBoxDefaultButton.Button1);
		}
	}
}