/*

  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) 2009-2011

  the Initial Developer. All Rights Reserved.

  Contributor(s):

  Christian Vallières

  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.Text;

namespace OpenHardwareMonitor.Hardware.Nvidia {

  internal class NvidiaGPU : Hardware {

    private readonly int adapterIndex;

    private readonly NvPhysicalGpuHandle handle;

    private readonly NvDisplayHandle? displayHandle;

    private readonly Sensor[] temperatures;

    private readonly Sensor fan;

    private readonly Sensor[] clocks;

    private readonly Sensor[] loads;

    private readonly Sensor control;

    private readonly Sensor memoryLoad;

    private readonly Control fanControl;

    private bool restoreDefaultFanSpeedRequired;

    private NvLevel initialFanSpeedValue;

    public NvidiaGPU(int adapterIndex, NvPhysicalGpuHandle handle,

      NvDisplayHandle? displayHandle, ISettings settings)

      : base(GetName(handle), new Identifier("nvidiagpu",

          adapterIndex.ToString(CultureInfo.InvariantCulture)), settings) {

      this.adapterIndex = adapterIndex;

      this.handle = handle;

      this.displayHandle = displayHandle;

      NvGPUThermalSettings thermalSettings = GetThermalSettings();

      temperatures = new Sensor[thermalSettings.Count];

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

        NvSensor sensor = thermalSettings.Sensor[i];

        string name;

        switch (sensor.Target) {

          case NvThermalTarget.BOARD: name = "GPU Board"; break;

          case NvThermalTarget.GPU: name = "GPU Core"; break;

          case NvThermalTarget.MEMORY: name = "GPU Memory"; break;

          case NvThermalTarget.POWER_SUPPLY: name = "GPU Power Supply"; break;

          case NvThermalTarget.UNKNOWN: name = "GPU Unknown"; break;

          default: name = "GPU"; break;

        }

        temperatures[i] = new Sensor(name, i, SensorType.Temperature, this,

          new ParameterDescription[0], settings);

        ActivateSensor(temperatures[i]);

      }

      int value;

      if (NVAPI.NvAPI_GPU_GetTachReading != null &&

        NVAPI.NvAPI_GPU_GetTachReading(handle, out value) == NvStatus.OK) {

        if (value > 0) {

          fan = new Sensor("GPU", 0, SensorType.Fan, this, settings);

          ActivateSensor(fan);

        }

      }

      clocks = new Sensor[3];

      clocks[0] = new Sensor("GPU Core", 0, SensorType.Clock, this, settings);

      clocks[1] = new Sensor("GPU Memory", 1, SensorType.Clock, this, settings);

      clocks[2] = new Sensor("GPU Shader", 2, SensorType.Clock, this, settings);

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

        ActivateSensor(clocks[i]);

      loads = new Sensor[3];

      loads[0] = new Sensor("GPU Core", 0, SensorType.Load, this, settings);

      loads[1] = new Sensor("GPU Memory Controller", 1, SensorType.Load, this, settings);

      loads[2] = new Sensor("GPU Video Engine", 2, SensorType.Load, this, settings);

      memoryLoad = new Sensor("GPU Memory", 3, SensorType.Load, this, settings);

      control = new Sensor("GPU Fan", 0, SensorType.Control, this, settings);

      NvGPUCoolerSettings coolerSettings = GetCoolerSettings();

      if (coolerSettings.Count > 0) {

        fanControl = new Control(control, settings,

          coolerSettings.Cooler[0].DefaultMin, 

          coolerSettings.Cooler[0].DefaultMax);

        fanControl.ControlModeChanged += ControlModeChanged;

        fanControl.SoftwareControlValueChanged += SoftwareControlValueChanged;

        ControlModeChanged(fanControl);

        control.Control = fanControl;

      }

      Update();

    }

    private static string GetName(NvPhysicalGpuHandle handle) {

      string gpuName;

      if (NVAPI.NvAPI_GPU_GetFullName(handle, out gpuName) == NvStatus.OK) {

        return "NVIDIA " + gpuName.Trim();

      } else {

        return "NVIDIA";

      }

    }

    public override HardwareType HardwareType {

      get { return HardwareType.GpuNvidia; }

    }

    private NvGPUThermalSettings GetThermalSettings() {

      NvGPUThermalSettings settings = new NvGPUThermalSettings();

      settings.Version = NVAPI.GPU_THERMAL_SETTINGS_VER;

      settings.Count = NVAPI.MAX_THERMAL_SENSORS_PER_GPU;

      settings.Sensor = new NvSensor[NVAPI.MAX_THERMAL_SENSORS_PER_GPU];

      if (!(NVAPI.NvAPI_GPU_GetThermalSettings != null &&

        NVAPI.NvAPI_GPU_GetThermalSettings(handle, (int)NvThermalTarget.ALL,

          ref settings) == NvStatus.OK)) 

      {

        settings.Count = 0;

      }       

      return settings;    

    }

    private NvGPUCoolerSettings GetCoolerSettings() {

      NvGPUCoolerSettings settings = new NvGPUCoolerSettings();

      settings.Version = NVAPI.GPU_COOLER_SETTINGS_VER;

      settings.Cooler = new NvCooler[NVAPI.MAX_COOLER_PER_GPU];

      if (!(NVAPI.NvAPI_GPU_GetCoolerSettings != null &&

        NVAPI.NvAPI_GPU_GetCoolerSettings(handle, 0, 

          ref settings) == NvStatus.OK)) 

      {

        settings.Count = 0;

      }

      return settings;  

    }

    private uint[] GetClocks() {

      NvClocks allClocks = new NvClocks();

      allClocks.Version = NVAPI.GPU_CLOCKS_VER;

      allClocks.Clock = new uint[NVAPI.MAX_CLOCKS_PER_GPU];

      if (NVAPI.NvAPI_GPU_GetAllClocks != null &&

        NVAPI.NvAPI_GPU_GetAllClocks(handle, ref allClocks) == NvStatus.OK) {

        return allClocks.Clock;

      }

      return null;

    }

    public override void Update() {

      NvGPUThermalSettings settings = GetThermalSettings();

      foreach (Sensor sensor in temperatures)

        sensor.Value = settings.Sensor[sensor.Index].CurrentTemp;

      if (fan != null) {

        int value = 0;

        NVAPI.NvAPI_GPU_GetTachReading(handle, out value);

        fan.Value = value;

      }

      uint[] values = GetClocks();

      if (values != null) {

        clocks[0].Value = 0.001f * values[0];

        clocks[1].Value = 0.001f * values[8];

        clocks[2].Value = 0.001f * values[14];

        if (values[30] != 0) {

          clocks[0].Value = 0.0005f * values[30];

          clocks[2].Value = 0.001f * values[30];

        }

      }

      NvPStates states = new NvPStates();

      states.Version = NVAPI.GPU_PSTATES_VER;

      states.PStates = new NvPState[NVAPI.MAX_PSTATES_PER_GPU];

      if (NVAPI.NvAPI_GPU_GetPStates != null &&

        NVAPI.NvAPI_GPU_GetPStates(handle, ref states) == NvStatus.OK) {

        for (int i = 0; i < 3; i++)

          if (states.PStates[i].Present) {

            loads[i].Value = states.PStates[i].Percentage;

            ActivateSensor(loads[i]);

          }

      } else {

        NvUsages usages = new NvUsages();

        usages.Version = NVAPI.GPU_USAGES_VER;

        usages.Usage = new uint[NVAPI.MAX_USAGES_PER_GPU];

        if (NVAPI.NvAPI_GPU_GetUsages != null &&

          NVAPI.NvAPI_GPU_GetUsages(handle, ref usages) == NvStatus.OK) {

          loads[0].Value = usages.Usage[2];

          loads[1].Value = usages.Usage[6];

          loads[2].Value = usages.Usage[10];

          for (int i = 0; i < 3; i++)

            ActivateSensor(loads[i]);

        }

      }

      NvGPUCoolerSettings coolerSettings = GetCoolerSettings();

      if (coolerSettings.Count > 0) {

        control.Value = coolerSettings.Cooler[0].CurrentLevel;

        ActivateSensor(control);

      }

      NvMemoryInfo memoryInfo = new NvMemoryInfo();

      memoryInfo.Version = NVAPI.GPU_MEMORY_INFO_VER;

      memoryInfo.Values = new uint[NVAPI.MAX_MEMORY_VALUES_PER_GPU];

      if (NVAPI.NvAPI_GPU_GetMemoryInfo != null && displayHandle.HasValue &&

        NVAPI.NvAPI_GPU_GetMemoryInfo(displayHandle.Value, ref memoryInfo) ==

        NvStatus.OK) {

        uint totalMemory = memoryInfo.Values[0];

        uint freeMemory = memoryInfo.Values[4];

        float usedMemory = Math.Max(totalMemory - freeMemory, 0);

        memoryLoad.Value = 100f * usedMemory / totalMemory;

        ActivateSensor(memoryLoad);

      }

    }

    public override string GetReport() {

      StringBuilder r = new StringBuilder();

      r.AppendLine("Nvidia GPU");

      r.AppendLine();

      r.AppendFormat("Name: {0}{1}", name, Environment.NewLine);

      r.AppendFormat("Index: {0}{1}", adapterIndex, Environment.NewLine);

      if (displayHandle.HasValue && NVAPI.NvAPI_GetDisplayDriverVersion != null) {

        NvDisplayDriverVersion driverVersion = new NvDisplayDriverVersion();

        driverVersion.Version = NVAPI.DISPLAY_DRIVER_VERSION_VER;

        if (NVAPI.NvAPI_GetDisplayDriverVersion(displayHandle.Value,

          ref driverVersion) == NvStatus.OK) {

          r.Append("Driver Version: ");

          r.Append(driverVersion.DriverVersion / 100);

          r.Append(".");

          r.Append((driverVersion.DriverVersion % 100).ToString("00",

            CultureInfo.InvariantCulture));

          r.AppendLine();

          r.Append("Driver Branch: ");

          r.AppendLine(driverVersion.BuildBranch);

        }

      }

      r.AppendLine();

      if (NVAPI.NvAPI_GPU_GetThermalSettings != null) {

        NvGPUThermalSettings settings = new NvGPUThermalSettings();

        settings.Version = NVAPI.GPU_THERMAL_SETTINGS_VER;

        settings.Count = NVAPI.MAX_THERMAL_SENSORS_PER_GPU;

        settings.Sensor = new NvSensor[NVAPI.MAX_THERMAL_SENSORS_PER_GPU];

        NvStatus status = NVAPI.NvAPI_GPU_GetThermalSettings(handle,

          (int)NvThermalTarget.ALL, ref settings);

        r.AppendLine("Thermal Settings");

        r.AppendLine();

        if (status == NvStatus.OK) {

          for (int i = 0; i < settings.Count; i++) {

            r.AppendFormat(" Sensor[{0}].Controller: {1}{2}", i,

              settings.Sensor[i].Controller, Environment.NewLine);

            r.AppendFormat(" Sensor[{0}].DefaultMinTemp: {1}{2}", i,

              settings.Sensor[i].DefaultMinTemp, Environment.NewLine);

            r.AppendFormat(" Sensor[{0}].DefaultMaxTemp: {1}{2}", i,

              settings.Sensor[i].DefaultMaxTemp, Environment.NewLine);

            r.AppendFormat(" Sensor[{0}].CurrentTemp: {1}{2}", i,

              settings.Sensor[i].CurrentTemp, Environment.NewLine);

            r.AppendFormat(" Sensor[{0}].Target: {1}{2}", i,

              settings.Sensor[i].Target, Environment.NewLine);

          }

        } else {

          r.Append(" Status: ");

          r.AppendLine(status.ToString());

        }

        r.AppendLine();

      }

      if (NVAPI.NvAPI_GPU_GetAllClocks != null) {

        NvClocks allClocks = new NvClocks();

        allClocks.Version = NVAPI.GPU_CLOCKS_VER;

        allClocks.Clock = new uint[NVAPI.MAX_CLOCKS_PER_GPU];

        NvStatus status = NVAPI.NvAPI_GPU_GetAllClocks(handle, ref allClocks);

        r.AppendLine("Clocks");

        r.AppendLine();

        if (status == NvStatus.OK) {

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

            if (allClocks.Clock[i] > 0) {

              r.AppendFormat(" Clock[{0}]: {1}{2}", i, allClocks.Clock[i],

                Environment.NewLine);

            }

        } else {

          r.Append(" Status: ");

          r.AppendLine(status.ToString());

        }

        r.AppendLine();

      }

      if (NVAPI.NvAPI_GPU_GetTachReading != null) {

        int tachValue;

        NvStatus status = NVAPI.NvAPI_GPU_GetTachReading(handle, out tachValue);

        r.AppendLine("Tachometer");

        r.AppendLine();

        if (status == NvStatus.OK) {

          r.AppendFormat(" Value: {0}{1}", tachValue, Environment.NewLine);

        } else {

          r.Append(" Status: ");

          r.AppendLine(status.ToString());

        }

        r.AppendLine();

      }

      if (NVAPI.NvAPI_GPU_GetPStates != null) {

        NvPStates states = new NvPStates();

        states.Version = NVAPI.GPU_PSTATES_VER;

        states.PStates = new NvPState[NVAPI.MAX_PSTATES_PER_GPU];

        NvStatus status = NVAPI.NvAPI_GPU_GetPStates(handle, ref states);

        r.AppendLine("P-States");

        r.AppendLine();

        if (status == NvStatus.OK) {

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

            if (states.PStates[i].Present)

              r.AppendFormat(" Percentage[{0}]: {1}{2}", i,

                states.PStates[i].Percentage, Environment.NewLine);

        } else {

          r.Append(" Status: ");

          r.AppendLine(status.ToString());

        }

        r.AppendLine();

      }

      if (NVAPI.NvAPI_GPU_GetUsages != null) {

        NvUsages usages = new NvUsages();

        usages.Version = NVAPI.GPU_USAGES_VER;

        usages.Usage = new uint[NVAPI.MAX_USAGES_PER_GPU];

        NvStatus status = NVAPI.NvAPI_GPU_GetUsages(handle, ref usages);

        r.AppendLine("Usages");

        r.AppendLine();

        if (status == NvStatus.OK) {

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

            if (usages.Usage[i] > 0)

              r.AppendFormat(" Usage[{0}]: {1}{2}", i,

                usages.Usage[i], Environment.NewLine);

        } else {

          r.Append(" Status: ");

          r.AppendLine(status.ToString());

        }

        r.AppendLine();

      }

      if (NVAPI.NvAPI_GPU_GetCoolerSettings != null) {

        NvGPUCoolerSettings settings = new NvGPUCoolerSettings();

        settings.Version = NVAPI.GPU_COOLER_SETTINGS_VER;

        settings.Cooler = new NvCooler[NVAPI.MAX_COOLER_PER_GPU];

        NvStatus status =

          NVAPI.NvAPI_GPU_GetCoolerSettings(handle, 0, ref settings);

        r.AppendLine("Cooler Settings");

        r.AppendLine();

        if (status == NvStatus.OK) {

          for (int i = 0; i < settings.Count; i++) {

            r.AppendFormat(" Cooler[{0}].Type: {1}{2}", i,

              settings.Cooler[i].Type, Environment.NewLine);

            r.AppendFormat(" Cooler[{0}].Controller: {1}{2}", i,

              settings.Cooler[i].Controller, Environment.NewLine);

            r.AppendFormat(" Cooler[{0}].DefaultMin: {1}{2}", i,

              settings.Cooler[i].DefaultMin, Environment.NewLine);

            r.AppendFormat(" Cooler[{0}].DefaultMax: {1}{2}", i,

              settings.Cooler[i].DefaultMax, Environment.NewLine);

            r.AppendFormat(" Cooler[{0}].CurrentMin: {1}{2}", i,

              settings.Cooler[i].CurrentMin, Environment.NewLine);

            r.AppendFormat(" Cooler[{0}].CurrentMax: {1}{2}", i,

              settings.Cooler[i].CurrentMax, Environment.NewLine);

            r.AppendFormat(" Cooler[{0}].CurrentLevel: {1}{2}", i,

              settings.Cooler[i].CurrentLevel, Environment.NewLine);

            r.AppendFormat(" Cooler[{0}].DefaultPolicy: {1}{2}", i,

              settings.Cooler[i].DefaultPolicy, Environment.NewLine);

            r.AppendFormat(" Cooler[{0}].CurrentPolicy: {1}{2}", i,

              settings.Cooler[i].CurrentPolicy, Environment.NewLine);

            r.AppendFormat(" Cooler[{0}].Target: {1}{2}", i,

              settings.Cooler[i].Target, Environment.NewLine);

            r.AppendFormat(" Cooler[{0}].ControlType: {1}{2}", i,

              settings.Cooler[i].ControlType, Environment.NewLine);

            r.AppendFormat(" Cooler[{0}].Active: {1}{2}", i,

              settings.Cooler[i].Active, Environment.NewLine);

          }

        } else {

          r.Append(" Status: ");

          r.AppendLine(status.ToString());

        }

        r.AppendLine();

      }

      if (NVAPI.NvAPI_GPU_GetMemoryInfo != null && displayHandle.HasValue) {

        NvMemoryInfo memoryInfo = new NvMemoryInfo();

        memoryInfo.Version = NVAPI.GPU_MEMORY_INFO_VER;

        memoryInfo.Values = new uint[NVAPI.MAX_MEMORY_VALUES_PER_GPU];

        NvStatus status = NVAPI.NvAPI_GPU_GetMemoryInfo(displayHandle.Value,

          ref memoryInfo);

        r.AppendLine("Memory Info");

        r.AppendLine();

        if (status == NvStatus.OK) {

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

            r.AppendFormat(" Value[{0}]: {1}{2}", i,

                memoryInfo.Values[i], Environment.NewLine);

        } else {

          r.Append(" Status: ");

          r.AppendLine(status.ToString());

        }

        r.AppendLine();

      }

      return r.ToString();

    }

    private void SoftwareControlValueChanged(IControl control) {

      SaveDefaultFanSpeed();

      NvGPUCoolerLevels coolerLevels = new NvGPUCoolerLevels();

      coolerLevels.Version = NVAPI.GPU_COOLER_LEVELS_VER;

      coolerLevels.Levels = new NvLevel[NVAPI.MAX_COOLER_PER_GPU];

      coolerLevels.Levels[0].Level = (int)control.SoftwareValue;

      coolerLevels.Levels[0].Policy = 1;

      NVAPI.NvAPI_GPU_SetCoolerLevels(handle, 0, ref coolerLevels);

    }

    private void SaveDefaultFanSpeed() {

      if (!restoreDefaultFanSpeedRequired) {

        NvGPUCoolerSettings coolerSettings = GetCoolerSettings();

        if (coolerSettings.Count > 0) {

          restoreDefaultFanSpeedRequired = true;

          initialFanSpeedValue.Level = coolerSettings.Cooler[0].CurrentLevel;

          initialFanSpeedValue.Policy = coolerSettings.Cooler[0].CurrentPolicy;

        }

      }

    }

    private void ControlModeChanged(IControl control) {

      if (control.ControlMode == ControlMode.Default) {

        RestoreDefaultFanSpeed();

      } else {

        SoftwareControlValueChanged(control);

      }

    }

    private void RestoreDefaultFanSpeed() {

      if (restoreDefaultFanSpeedRequired) {

        NvGPUCoolerLevels coolerLevels = new NvGPUCoolerLevels();

        coolerLevels.Version = NVAPI.GPU_COOLER_LEVELS_VER;

        coolerLevels.Levels = new NvLevel[NVAPI.MAX_COOLER_PER_GPU];

        coolerLevels.Levels[0] = initialFanSpeedValue;

        NVAPI.NvAPI_GPU_SetCoolerLevels(handle, 0, ref coolerLevels);

        restoreDefaultFanSpeedRequired = false;

      }

    }

  }

}