/*

  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) 

      : base("Heatmaster", new Identifier("heatmaster",

        portName.TrimStart(new [] {'/'}).ToLowerInvariant()), 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; }

    }

    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 override void Close() {

      serialPort.Close();

      serialPort.Dispose();

      serialPort = null;

      base.Close();

    }

    public void Dispose() {

      if (serialPort != null) {

        serialPort.Dispose();

        serialPort = null;

      }

    }

  }

}