/*

  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) 2009-2010

  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.Text;

namespace OpenHardwareMonitor.Hardware.TBalancer {

  internal class TBalancer : IHardware {

    private readonly ISettings settings;

    private readonly int portIndex;    

    private readonly byte protocolVersion;

    private readonly Sensor[] digitalTemperatures = new Sensor[8];

    private readonly Sensor[] analogTemperatures = new Sensor[4];

    private readonly Sensor[] sensorhubTemperatures = new Sensor[6];

    private readonly Sensor[] sensorhubFlows = new Sensor[2];

    private readonly Sensor[] fans = new Sensor[4];

    private readonly Sensor[] controls = new Sensor[4];

    private readonly Sensor[] miniNGTemperatures = new Sensor[4];

    private readonly Sensor[] miniNGFans = new Sensor[4];

    private readonly Sensor[] miniNGControls = new Sensor[4];

    private readonly List<ISensor> active = new List<ISensor>();

    private readonly List<ISensor> deactivating = new List<ISensor>();

    private FT_HANDLE handle;

    private int[] primaryData = new int[0];

    private int[] alternativeData = new int[0];

    public const byte STARTFLAG = 100;

    public const byte ENDFLAG = 254;

    private delegate void MethodDelegate();

    private readonly MethodDelegate alternativeRequest;    

    public TBalancer(int portIndex, byte protocolVersion, ISettings settings) {

      this.settings = settings;

      this.portIndex = portIndex;

      this.protocolVersion = protocolVersion;

      ParameterDescription[] parameter = new [] {

        new ParameterDescription("Offset [°C]", "Temperature offset.", 0)

      };

      int offset = 0;

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

        digitalTemperatures[i] = new Sensor("Digital Sensor " + i,

          offset + i, SensorType.Temperature, this, parameter, settings);

      offset += digitalTemperatures.Length;

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

        analogTemperatures[i] = new Sensor("Analog Sensor " + (i + 1),

          offset + i, SensorType.Temperature, this, parameter, settings);

      offset += analogTemperatures.Length;

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

        sensorhubTemperatures[i] = new Sensor("Sensorhub Sensor " + i,

          offset + i, SensorType.Temperature, this, parameter, settings);

      offset += sensorhubTemperatures.Length;

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

        miniNGTemperatures[i] = new Sensor("miniNG #" + (i / 2 + 1) +

          " Sensor " + (i % 2 + 1), offset + i, SensorType.Temperature,

          this, parameter, settings);

      offset += miniNGTemperatures.Length;

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

        sensorhubFlows[i] = new Sensor("Flowmeter " + (i + 1),

          i, SensorType.Flow, this, new [] {

            new ParameterDescription("Impulse Rate", 

              "The impulse rate of the flowmeter in pulses/L", 509)

          }, settings);

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

        controls[i] = new Sensor("Fan Channel " + i, i, SensorType.Control, 

          this, settings);

      }

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

        miniNGControls[i] = new Sensor("miniNG #" + (i / 2 + 1) +

          " Fan Channel " + (i % 2 + 1), 4 + i, SensorType.Control, this, 

          settings);

      }

      alternativeRequest = new MethodDelegate(DelayedAlternativeRequest);

      Open();

      Update(); 

    }

    private void ActivateSensor(Sensor sensor) {

      deactivating.Remove(sensor);

      if (!active.Contains(sensor)) {

        active.Add(sensor);

        if (SensorAdded != null)

          SensorAdded(sensor);

      }      

    }

    private void DeactivateSensor(Sensor sensor) {

      if (deactivating.Contains(sensor)) {

        active.Remove(sensor);

        deactivating.Remove(sensor);

        if (SensorRemoved != null)

          SensorRemoved(sensor);

      } else if (active.Contains(sensor)) {

        deactivating.Add(sensor);

      }     

    }

    private void ReadminiNG(int[] data, int number) {

      int offset = 1 + number * 65;

      if (data[offset + 61] != ENDFLAG)

        return;

      for (int i = 0; i < 2; i++) {

        Sensor sensor = miniNGTemperatures[number * 2 + i];

        if (data[offset + 7 + i] > 0) {

          sensor.Value = 0.5f * data[offset + 7 + i] + 

            sensor.Parameters[0].Value;

          ActivateSensor(sensor);

        } else {

          DeactivateSensor(sensor);

        }

      }

      for (int i = 0; i < 2; i++) {

        if (miniNGFans[number * 2 + i] == null)

          miniNGFans[number * 2 + i] = 

            new Sensor("miniNG #" + (number + 1) + " Fan Channel " + (i + 1),

            4 + number * 2 + i, SensorType.Fan, this, settings);

        Sensor sensor = miniNGFans[number * 2 + i];

        sensor.Value = 20.0f * data[offset + 43 + 2 * i];

        ActivateSensor(sensor);

      }

      for (int i = 0; i < 2; i++) {

        Sensor sensor = miniNGControls[number * 2 + i];

        sensor.Value = data[offset + 15 + i];

        ActivateSensor(sensor);

      }

    }

    private void ReadData() {

      int[] data = new int[285];

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

        data[i] = FTD2XX.ReadByte(handle);

      if (data[0] != STARTFLAG) {

        FTD2XX.FT_Purge(handle, FT_PURGE.FT_PURGE_RX);   

        return;

      }

      if (data[1] == 255 || data[1] == 88) { // bigNG

        if (data[274] != protocolVersion) 

          return;

        this.primaryData = data;

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

          if (data[238 + i] > 0) {

            digitalTemperatures[i].Value = 0.5f * data[238 + i] + 

              digitalTemperatures[i].Parameters[0].Value;

            ActivateSensor(digitalTemperatures[i]);

          } else {

            DeactivateSensor(digitalTemperatures[i]);

          }

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

          if (data[260 + i] > 0) {

            analogTemperatures[i].Value = 0.5f * data[260 + i] +

              analogTemperatures[i].Parameters[0].Value;

            ActivateSensor(analogTemperatures[i]);

          } else {

            DeactivateSensor(analogTemperatures[i]);

          }

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

          if (data[246 + i] > 0) {

            sensorhubTemperatures[i].Value = 0.5f * data[246 + i] +

              sensorhubTemperatures[i].Parameters[0].Value;

            ActivateSensor(sensorhubTemperatures[i]);

          } else {

            DeactivateSensor(sensorhubTemperatures[i]);

          }

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

          if (data[231 + i] > 0 && data[234] > 0) {

            float pulsesPerSecond = (data[231 + i] * 4.0f) / data[234];

            float pulsesPerLiter = sensorhubFlows[i].Parameters[0].Value;

            sensorhubFlows[i].Value = pulsesPerSecond * 3600 / pulsesPerLiter;

            ActivateSensor(sensorhubFlows[i]);

          } else {

            DeactivateSensor(sensorhubFlows[i]);

          }

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

          float maxRPM = 11.5f * ((data[149 + 2 * i] << 8) | data[148 + 2 * i]);

          if (fans[i] == null)

            fans[i] = new Sensor("Fan Channel " + i, i, SensorType.Fan,

              this, new [] { new ParameterDescription("MaxRPM", 

                  "Maximum revolutions per minute (RPM) of the fan.", maxRPM)

              }, settings);

          float value;

          if ((data[136] & (1 << i)) == 0)  // pwm mode

            value = 0.02f * data[137 + i];

          else // analog mode

            value = 0.01f * data[141 + i];

          fans[i].Value = fans[i].Parameters[0].Value * value;

          ActivateSensor(fans[i]);

          controls[i].Value = 100 * value;

          ActivateSensor(controls[i]);

        }

      } else if (data[1] == 253) { // miniNG #1

        this.alternativeData = data;

        ReadminiNG(data, 0);        

        if (data[66] == 253)  // miniNG #2

          ReadminiNG(data, 1);

      } 

    }

    public HardwareType HardwareType {

      get { return HardwareType.TBalancer; }

    }

    public string Name {

      get { return "T-Balancer bigNG"; }

    }

    public Identifier Identifier {

      get { 

        return new Identifier("bigng",

          this.portIndex.ToString(CultureInfo.InvariantCulture));

      }

    }

    public IHardware[] SubHardware {

      get { return new IHardware[0]; }

    }

    public virtual IHardware Parent {

      get { return null; }

    }

    public ISensor[] Sensors {

      get { return active.ToArray(); }

    }

    public string GetReport() {

      StringBuilder r = new StringBuilder();

      r.AppendLine("T-Balancer bigNG");

      r.AppendLine();

      r.Append("Port Index: "); 

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

      r.AppendLine();

      r.AppendLine("Primary System Information Answer");

      r.AppendLine();

      r.AppendLine("       00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F");

      r.AppendLine();

      for (int i = 0; i <= 0x11; i++) {

        r.Append(" "); 

        r.Append((i << 4).ToString("X3", CultureInfo.InvariantCulture)); 

        r.Append("  ");

        for (int j = 0; j <= 0xF; j++) {

          int index = ((i << 4) | j);

          if (index < primaryData.Length) {

            r.Append(" ");

            r.Append(primaryData[index].ToString("X2", CultureInfo.InvariantCulture));

          }          

        }

        r.AppendLine();

      }

      r.AppendLine();

      if (alternativeData.Length > 0) {

        r.AppendLine("Alternative System Information Answer");

        r.AppendLine();

        r.AppendLine("       00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F");

        r.AppendLine();

        for (int i = 0; i <= 0x11; i++) {

          r.Append(" "); 

          r.Append((i << 4).ToString("X3", CultureInfo.InvariantCulture)); 

          r.Append("  ");

          for (int j = 0; j <= 0xF; j++) {

            int index = ((i << 4) | j);

            if (index < alternativeData.Length) {

              r.Append(" ");

              r.Append(alternativeData[index].ToString("X2", CultureInfo.InvariantCulture));

            }

          }

          r.AppendLine();

        }

        r.AppendLine();

      }

      return r.ToString();

    }

    private void DelayedAlternativeRequest() {

      System.Threading.Thread.Sleep(500);      

      FTD2XX.Write(handle, new byte[] { 0x37 });

    }

    public void Open() {

      FTD2XX.FT_Open(portIndex, out handle); 

      FTD2XX.FT_SetBaudRate(handle, 19200);

      FTD2XX.FT_SetDataCharacteristics(handle, 8, 1, 0);

      FTD2XX.FT_SetFlowControl(handle, FT_FLOW_CONTROL.FT_FLOW_RTS_CTS, 0x11,

        0x13);

      FTD2XX.FT_SetTimeouts(handle, 1000, 1000);

      FTD2XX.FT_Purge(handle, FT_PURGE.FT_PURGE_ALL);

    }

    public void Update() {

      while (FTD2XX.BytesToRead(handle) >= 285)

        ReadData();

      if (FTD2XX.BytesToRead(handle) == 1)

        FTD2XX.ReadByte(handle);

      FTD2XX.Write(handle, new byte[] { 0x38 });

      alternativeRequest.BeginInvoke(null, null);

    }

    public void Close() {

      FTD2XX.FT_Close(handle);

    }

    public event SensorEventHandler SensorAdded;

    public event SensorEventHandler SensorRemoved;

    public void Accept(IVisitor visitor) {

      if (visitor == null)

        throw new ArgumentNullException("visitor");

      visitor.VisitHardware(this);

    }

    public void Traverse(IVisitor visitor) { }

  }

}