/*

  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;

using System.Threading;

namespace OpenHardwareMonitor.Hardware.TBalancer {

  internal class TBalancerGroup : IGroup {

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

    private readonly StringBuilder report = new StringBuilder();

    public TBalancerGroup(ISettings settings) {

      uint numDevices;

      try {

        if (FTD2XX.FT_CreateDeviceInfoList(out numDevices) != FT_STATUS.FT_OK) {

          report.AppendLine("Status: FT_CreateDeviceInfoList failed");

          return;

        }

      } catch (DllNotFoundException) { return; } 

        catch (ArgumentNullException) { return; }

        catch (EntryPointNotFoundException) { return; }

        catch (BadImageFormatException) { return; }

      FT_DEVICE_INFO_NODE[] info = new FT_DEVICE_INFO_NODE[numDevices];

      if (FTD2XX.FT_GetDeviceInfoList(info, ref numDevices) != FT_STATUS.FT_OK) 

      {

        report.AppendLine("Status: FT_GetDeviceInfoList failed");        

        return;

      }

      // make sure numDevices is not larger than the info array

      if (numDevices > info.Length)

        numDevices = (uint)info.Length;

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

        report.Append("Device Index: ");

        report.AppendLine(i.ToString(CultureInfo.InvariantCulture));

        report.Append("Device Type: ");

        report.AppendLine(info[i].Type.ToString());

        // the T-Balancer always uses an FT232BM

        if (info[i].Type != FT_DEVICE.FT_DEVICE_232BM) {

          report.AppendLine("Status: Wrong device type");

          continue;

        }

        FT_HANDLE handle;

        FT_STATUS status = FTD2XX.FT_Open(i, out handle);

        if (status != FT_STATUS.FT_OK) {

          report.AppendLine("Open Status: " + status);

          continue;

        }

        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);

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

        if (status != FT_STATUS.FT_OK) {

          report.AppendLine("Write Status: " + status);

          FTD2XX.FT_Close(handle);

          continue;

        }

        bool isValid = false;

        byte protocolVersion = 0;

        int j = 0;

        while (FTD2XX.BytesToRead(handle) == 0 && j < 2) {

          Thread.Sleep(100);

          j++;

        }

        if (FTD2XX.BytesToRead(handle) > 0) {

          if (FTD2XX.ReadByte(handle) == TBalancer.STARTFLAG) {

            while (FTD2XX.BytesToRead(handle) < 284 && j < 5) {

              Thread.Sleep(100);

              j++;

            }

            int length = FTD2XX.BytesToRead(handle);

            if (length >= 284) {

              byte[] data = new byte[285];

              data[0] = TBalancer.STARTFLAG;

              for (int k = 1; k < data.Length; k++)

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

              // check protocol version 2X (protocols seen: 2C, 2A, 28)

              isValid = (data[274] & 0xF0) == 0x20;

              protocolVersion = data[274];

              if (!isValid) {

                report.Append("Status: Wrong Protocol Version: 0x");

                report.AppendLine(

                  protocolVersion.ToString("X", CultureInfo.InvariantCulture));

              }

            } else {

              report.AppendLine("Status: Wrong Message Length: " + length);

            }

          } else {

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

          }

        } else {

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

        }

        FTD2XX.FT_Purge(handle, FT_PURGE.FT_PURGE_ALL);

        FTD2XX.FT_Close(handle);

        if (isValid) {

          report.AppendLine("Status: OK");

          hardware.Add(new TBalancer(i, protocolVersion, settings));

          return;

        }

        report.AppendLine();

      }

    }

    public IHardware[] Hardware {

      get {

        return hardware.ToArray();

      }

    }

    public string GetReport() {

      if (report.Length > 0) {

        report.Insert(0, "FTD2XX" + Environment.NewLine +

          Environment.NewLine);

        report.AppendLine();

        return report.ToString();

      } else

        return null;

    }

    public void Close() {

      foreach (TBalancer tbalancer in hardware)

        tbalancer.Close();

    }

  }

}