/*

   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) 2010-2011

   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.Globalization;

 using System.IO;

 using System.IO.Ports;

 using System.Text;

 using System.Text.RegularExpressions;

 using System.Threading;

 namespace OpenHardwareMonitor.Hardware.Heatmaster {

   internal class Heatmaster : Hardware, IDisposable {

     private readonly string portName;

     private SerialPort serialPort;

     private readonly int hardwareRevision;

     private readonly int firmwareRevision;

     private readonly int firmwareCRC;

     private readonly Sensor[] fans;

     private readonly Sensor[] controls;

     private readonly Sensor[] temperatures;

     private readonly Sensor[] flows;

     private readonly Sensor[] relays;

     private readonly bool available;

     private readonly StringBuilder buffer = new StringBuilder();

     private string ReadLine(int timeout) {

       int i = 0;

       StringBuilder builder = new StringBuilder();

       while (i <= timeout) {

         while (serialPort.BytesToRead > 0) {

           byte b = (byte)serialPort.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 string ReadField(int device, char field) {

       serialPort.WriteLine("[0:" + device + "]R" + field);

       for (int i = 0; i < 5; i++) {

         string s = ReadLine(200);

         Match match = Regex.Match(s, @"-\[0:" + 

           device.ToString(CultureInfo.InvariantCulture) + @"\]R" +

           Regex.Escape(field.ToString(CultureInfo.InvariantCulture)) + ":(.*)");

         if (match.Success) 

           return match.Groups[1].Value;

       }

       return null;

     }

     protected string ReadString(int device, char field) {

       string s = ReadField(device, field);

       if (s != null && s[0] == '"' && s[s.Length - 1] == '"')

         return s.Substring(1, s.Length - 2);

       else

         return null;

     }

     protected int ReadInteger(int device, char field) {

       string s = ReadField(device, field);      

       int i;

       if (int.TryParse(s, out i))

         return i;

       else

         return 0;

     }

     private bool WriteField(int device, char field, string value) {

       serialPort.WriteLine("[0:" + device + "]W" + field + ":" + value);

       for (int i = 0; i < 5; i++) {

         string s = ReadLine(200);

         Match match = Regex.Match(s, @"-\[0:" + 

           device.ToString(CultureInfo.InvariantCulture) + @"\]W" + 

           Regex.Escape(field.ToString(CultureInfo.InvariantCulture)) +

           ":" + value);

         if (match.Success)

           return true;

       }

       return false;

     }

     protected bool WriteInteger(int device, char field, int value) {

       return WriteField(device, field, 

         value.ToString(CultureInfo.InvariantCulture));

     }

     protected bool WriteString(int device, char field, string value) {

       return WriteField(device, field, '"' + value + '"');

     }

     public Heatmaster(string portName, ISettings settings) {

       this.portName = portName;

       try {

         serialPort = new SerialPort(portName, 38400, Parity.None, 8,

           StopBits.One);

         serialPort.Open();

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

         hardwareRevision = ReadInteger(0, 'H');

         firmwareRevision = ReadInteger(0, 'V');

         firmwareCRC = ReadInteger(0, 'C');

         int fanCount = Math.Min(ReadInteger(32, '?'), 4);

         int temperatureCount = Math.Min(ReadInteger(48, '?'), 6);

         int flowCount = Math.Min(ReadInteger(64, '?'), 1);

         int relayCount =  Math.Min(ReadInteger(80, '?'), 1);

         fans = new Sensor[fanCount];

         controls = new Sensor[fanCount];

         for (int i = 0; i < fanCount; i++) {

           int device = 33 + i;

           string name = ReadString(device, 'C');

           fans[i] = new Sensor(name, device, SensorType.Fan, this, settings);          

           fans[i].Value = ReadInteger(device, 'R');

           ActivateSensor(fans[i]);

           controls[i] =

             new Sensor(name, device, SensorType.Control, this, settings);

           controls[i].Value = (100 / 255.0f) * ReadInteger(device, 'P');

           ActivateSensor(controls[i]);

         }       

         temperatures = new Sensor[temperatureCount];

         for (int i = 0; i < temperatureCount; i++) {

           int device = 49 + i;

           string name = ReadString(device, 'C');

           temperatures[i] =

             new Sensor(name, device, SensorType.Temperature, this, settings);

           int value = ReadInteger(device, 'T');

           temperatures[i].Value = 0.1f * value;

           if (value != -32768)

             ActivateSensor(temperatures[i]);

         }

         flows = new Sensor[flowCount];

         for (int i = 0; i < flowCount; i++) {

           int device = 65 + i;

           string name = ReadString(device, 'C');

           flows[i] = new Sensor(name, device, SensorType.Flow, this, settings);

           flows[i].Value = 0.1f * ReadInteger(device, 'L');

           ActivateSensor(flows[i]);

         }

         relays = new Sensor[relayCount];

         for (int i = 0; i < relayCount; i++) {

           int device = 81 + i;

           string name = ReadString(device, 'C');

           relays[i] = 

             new Sensor(name, device, SensorType.Control, this, settings);

           relays[i].Value = 100 * ReadInteger(device, 'S');

           ActivateSensor(relays[i]);

         }

         // set the update rate to 2 Hz

         WriteInteger(0, 'L', 2);

         available = true;

       } catch (IOException) { } catch (TimeoutException) { }      

     }

     public override HardwareType HardwareType {

       get { return HardwareType.Heatmaster; }

     }

     public override Identifier Identifier {

       get {

         return new Identifier("heatmaster",

           serialPort.PortName.TrimStart(new [] {'/'}).ToLowerInvariant());

       }

     }

     public override string Name {

       get { return "Heatmaster"; }

     }

     private void ProcessUpdateLine(string line) {

       Match match = Regex.Match(line, @">\[0:(\d+)\]([0-9:\|-]+)");

       if (match.Success) {

         int device;

         if (int.TryParse(match.Groups[1].Value, out device)) {

           foreach (string s in match.Groups[2].Value.Split('|')) {

             string[] strings = s.Split(':');

             int[] ints = new int[strings.Length];            

             bool valid = true;

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

               if (!int.TryParse(strings[i], out ints[i])) {

                 valid = false;

                 break;

               }

             if (!valid)

               continue; 

             switch (device) {

               case 32:

                 if (ints.Length == 3 && ints[0] <= fans.Length) {

                   fans[ints[0] - 1].Value = ints[1];

                   controls[ints[0] - 1].Value = (100 / 255.0f) * ints[2];

                 }

                 break;

               case 48:

                 if (ints.Length == 2 && ints[0] <= temperatures.Length)

                   temperatures[ints[0] - 1].Value = 0.1f * ints[1];

                 break;

               case 64:

                 if (ints.Length == 3 && ints[0] <= flows.Length)

                   flows[ints[0] - 1].Value = 0.1f * ints[1];

                 break;

               case 80:

                 if (ints.Length == 2 && ints[0] <= relays.Length)

                   relays[ints[0] - 1].Value = 100 * ints[1];

                 break;

             }

           }

         }

       }

     }

     public override void Update() {

       if (!available)

         return;

       while (serialPort.IsOpen &&  serialPort.BytesToRead > 0) {

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

         if (b == 0x0D) {

           ProcessUpdateLine(buffer.ToString());

           buffer.Length = 0;

         } else {

           buffer.Append((char)b);

         }

       }

     }

     public override string GetReport() {

       StringBuilder r = new StringBuilder();

       r.AppendLine("Heatmaster");

       r.AppendLine();

       r.Append("Port: ");

       r.AppendLine(portName);

       r.Append("Hardware Revision: ");

       r.AppendLine(hardwareRevision.ToString(CultureInfo.InvariantCulture));

       r.Append("Firmware Revision: ");

       r.AppendLine(firmwareRevision.ToString(CultureInfo.InvariantCulture));

       r.Append("Firmware CRC: ");

       r.AppendLine(firmwareCRC.ToString(CultureInfo.InvariantCulture));

       r.AppendLine();

       return r.ToString();

     }

     public void Close() {

       serialPort.Close();

       serialPort.Dispose();

       serialPort = null;

     }

     public void Dispose() {

       if (serialPort != null) {

         serialPort.Dispose();

         serialPort = null;

       }

     }

   }

 }