/*

   Version: MPL 1.1/GPL 2.0/LGPL 2.1

   The contents of this file are subject to the Mozilla Public License Version

   1.1 (the "License"); you may not use this file except in compliance with

   the License. You may obtain a copy of the License at

   http://www.mozilla.org/MPL/

   Software distributed under the License is distributed on an "AS IS" basis,

   WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License

   for the specific language governing rights and limitations under the License.

   The Original Code is the Open Hardware Monitor code.

   The Initial Developer of the Original Code is 

   Michael Möller <m.moeller@gmx.ch>.

   Portions created by the Initial Developer are Copyright (C) 2010

   the Initial Developer. All Rights Reserved.

   Contributor(s):

   Alternatively, the contents of this file may be used under the terms of

   either the GNU General Public License Version 2 or later (the "GPL"), or

   the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),

   in which case the provisions of the GPL or the LGPL are applicable instead

   of those above. If you wish to allow use of your version of this file only

   under the terms of either the GPL or the LGPL, and not to allow others to

   use your version of this file under the terms of the MPL, indicate your

   decision by deleting the provisions above and replace them with the notice

   and other provisions required by the GPL or the LGPL. If you do not delete

   the provisions above, a recipient may use your version of this file under

   the terms of any one of the MPL, the GPL or the LGPL.

 */

 using System;

 using System.Collections.Generic;

 using System.Globalization;

 using System.IO.Ports;

 using System.Security;

 using System.Text;

 using System.Threading;

 using Microsoft.Win32;

 namespace OpenHardwareMonitor.Hardware.Heatmaster {

   internal class HeatmasterGroup : IGroup {

     private readonly List<Heatmaster> hardware = new List<Heatmaster>();

     private readonly StringBuilder report = new StringBuilder();

     private static string ReadLine(SerialPort port, int timeout) {

       int i = 0;

       StringBuilder builder = new StringBuilder();

       while (i < timeout) {

         while (port.BytesToRead > 0) {

           byte b = (byte)port.ReadByte();

           switch (b) {

             case 0xAA: return ((char)b).ToString();

             case 0x0D: return builder.ToString();

             default: builder.Append((char)b); break;

           }

         }

         i++;

         Thread.Sleep(1);

       }

       throw new TimeoutException();

     }

     private static string[] GetRegistryPortNames() {

       List<string> result = new List<string>();

       string[] paths = { "", "&MI_00" };

       try {

         foreach (string path in paths) {

           RegistryKey key = Registry.LocalMachine.OpenSubKey(

             @"SYSTEM\CurrentControlSet\Enum\USB\VID_10C4&PID_EA60" + path);

           if (key != null) {

             foreach (string subKeyName in key.GetSubKeyNames()) {

               RegistryKey subKey =

                 key.OpenSubKey(subKeyName + "\\" + "Device Parameters");

               if (subKey != null) {

                 string name = subKey.GetValue("PortName") as string;

                 if (name != null && !result.Contains(name))

                   result.Add(name);

               }

             }

           }

         }

       } catch (SecurityException) { }

       return result.ToArray();

     }

     public HeatmasterGroup(ISettings settings) {

       // No implementation for Heatmaster on Unix systems

       int p = (int)Environment.OSVersion.Platform;

       if ((p == 4) || (p == 128))

         return;

       string[] portNames = GetRegistryPortNames();      

       for (int i = 0; i < portNames.Length; i++) {

         bool isValid = false;

         try {        

           using (SerialPort serialPort =

             new SerialPort(portNames[i], 38400, Parity.None, 8, StopBits.One)) {

             serialPort.NewLine = ((char)0x0D).ToString();            

             report.Append("Port Name: "); report.AppendLine(portNames[i]);

             try {

               serialPort.Open();

             } catch (UnauthorizedAccessException) {

               report.AppendLine("Exception: Access Denied");

             }

             if (serialPort.IsOpen) {

               serialPort.DiscardInBuffer();

               serialPort.DiscardOutBuffer();

               serialPort.Write(new byte[] { 0xAA }, 0, 1);

               int j = 0;

               while (serialPort.BytesToRead == 0 && j < 10) {

                 Thread.Sleep(20);

                 j++;

               }

               if (serialPort.BytesToRead > 0) {

                 bool flag = false;

                 while (serialPort.BytesToRead > 0 && !flag) {

                   flag |= (serialPort.ReadByte() == 0xAA);

                 }

                 if (flag) {

                   serialPort.WriteLine("[0:0]RH");

                   try {

                     int k = 0;

                     int revision = 0;

                     while (k < 5) {

                       string line = ReadLine(serialPort, 100);

                       if (line.StartsWith("-[0:0]RH:",

                         StringComparison.Ordinal)) {

                         revision = int.Parse(line.Substring(9), 

                           CultureInfo.InvariantCulture);

                         break;

                       }

                       k++;

                     }

                     isValid = (revision == 770);

                     if (!isValid) {

                       report.Append("Status: Wrong Hardware Revision " +

                         revision.ToString(CultureInfo.InvariantCulture));

                     }

                   } catch (TimeoutException) {

                     report.AppendLine("Status: Timeout Reading Revision");

                   }

                 } else {

                   report.AppendLine("Status: Wrong Startflag");

                 }

               } else {

                 report.AppendLine("Status: No Response");

               }

               serialPort.DiscardInBuffer();

             } else {

               report.AppendLine("Status: Port not Open");

             }            

           }

         } catch (Exception e) {

           report.AppendLine(e.ToString());

         }

         if (isValid) {

           report.AppendLine("Status: OK");

           hardware.Add(new Heatmaster(portNames[i], settings));

         }

         report.AppendLine();

       }

     }

     public IHardware[] Hardware {

       get {

         return hardware.ToArray();

       }

     }

     public string GetReport() {

       if (report.Length > 0) {

         StringBuilder r = new StringBuilder();

         r.AppendLine("Serial Port Heatmaster");

         r.AppendLine();

         r.Append(report);

         r.AppendLine();

         return r.ToString();

       } else

         return null;

     }

     public void Close() {

       foreach (Heatmaster heatmaster in hardware)

         heatmaster.Close();

     }

   }

 }