/*

  This Source Code Form is subject to the terms of the Mozilla Public

  License, v. 2.0. If a copy of the MPL was not distributed with this

  file, You can obtain one at http://mozilla.org/MPL/2.0/.

  Copyright (C) 2009-2012 Michael Möller <mmoeller@openhardwaremonitor.org>

*/

using System.Collections.Generic;

using System.Globalization;

using System.IO;

using System.Text;

namespace OpenHardwareMonitor.Hardware.LPC {

  internal class LMSensors {

    private readonly List<LMChip> lmChips = new List<LMChip>();

    public LMSensors() {

      string[] basePaths = Directory.GetDirectories("/sys/class/hwmon/");

      foreach (string basePath in basePaths) {

        foreach (string devicePath in new[] { "/device", "" }) {

          string path = basePath + devicePath;

          string name = null;

          try {

            using (StreamReader reader = new StreamReader(path + "/name"))

              name = reader.ReadLine();

          } catch (IOException) { }

          switch (name) {

            case "atk0110":

              lmChips.Add(new LMChip(Chip.ATK0110, path)); break;

            case "f71858fg":

              lmChips.Add(new LMChip(Chip.F71858, path)); break;

            case "f71862fg":

              lmChips.Add(new LMChip(Chip.F71862, path)); break;

            case "f71882fg":

              lmChips.Add(new LMChip(Chip.F71882, path)); break;

            case "f71889fg":

              lmChips.Add(new LMChip(Chip.F71889F, path)); break;

            case "it8705":

              lmChips.Add(new LMChip(Chip.IT8705F, path)); break;

            case "it8712":

              lmChips.Add(new LMChip(Chip.IT8712F, path)); break;

            case "it8716":

              lmChips.Add(new LMChip(Chip.IT8716F, path)); break;

            case "it8718":

              lmChips.Add(new LMChip(Chip.IT8718F, path)); break;

            case "it8720":

              lmChips.Add(new LMChip(Chip.IT8720F, path)); break;

            case "w83627ehf":

              lmChips.Add(new LMChip(Chip.W83627EHF, path)); break;

            case "w83627dhg":

              lmChips.Add(new LMChip(Chip.W83627DHG, path)); break;

            case "w83667hg":

              lmChips.Add(new LMChip(Chip.W83667HG, path)); break;

            case "w83627hf":

              lmChips.Add(new LMChip(Chip.W83627HF, path)); break;

            case "w83627thf":

              lmChips.Add(new LMChip(Chip.W83627THF, path)); break;

            case "w83687thf":

              lmChips.Add(new LMChip(Chip.W83687THF, path)); break;

          }

        }

      }

    }

    public void Close() {

      foreach (LMChip lmChip in lmChips)

        lmChip.Close();

    }

    public ISuperIO[] SuperIO {

      get {

        return lmChips.ToArray();

      }

    }

    private class LMChip : ISuperIO {

      private string path;

      private readonly Chip chip;

      private readonly float?[] voltages;

      private readonly float?[] temperatures;

      private readonly float?[] fans;

      private readonly float?[] controls;

      private readonly FileStream[] voltageStreams;

      private readonly FileStream[] temperatureStreams;

      private readonly FileStream[] fanStreams;

      public Chip Chip { get { return chip; } }

      public float?[] Voltages { get { return voltages; } }

      public float?[] Temperatures { get { return temperatures; } }

      public float?[] Fans { get { return fans; } }

      public float?[] Controls { get { return controls; } }

      public LMChip(Chip chip, string path) {

        this.path = path;

        this.chip = chip;

        string[] voltagePaths = Directory.GetFiles(path, "in*_input");

        this.voltages = new float?[voltagePaths.Length];

        this.voltageStreams = new FileStream[voltagePaths.Length];

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

          voltageStreams[i] = new FileStream(voltagePaths[i],

            FileMode.Open, FileAccess.Read, FileShare.ReadWrite);

        string[] temperaturePaths = Directory.GetFiles(path, "temp*_input");

        this.temperatures = new float?[temperaturePaths.Length];

        this.temperatureStreams = new FileStream[temperaturePaths.Length];

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

          temperatureStreams[i] = new FileStream(temperaturePaths[i],

            FileMode.Open, FileAccess.Read, FileShare.ReadWrite);

        string[] fanPaths = Directory.GetFiles(path, "fan*_input");

        this.fans = new float?[fanPaths.Length];

        this.fanStreams = new FileStream[fanPaths.Length];

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

          fanStreams[i] = new FileStream(fanPaths[i],

            FileMode.Open, FileAccess.Read, FileShare.ReadWrite);

        this.controls = new float?[0];

      }

      public byte? ReadGPIO(int index) {

        return null;

      }

      public void WriteGPIO(int index, byte value) { }

      public string GetReport() {

        return null;

      }

      public void SetControl(int index, byte? value) { }   

      private string ReadFirstLine(Stream stream) {

        StringBuilder sb = new StringBuilder();

        try {

          stream.Seek(0, SeekOrigin.Begin);

          int b = stream.ReadByte();

          while (b != -1 && b != 10) {

            sb.Append((char)b);

            b = stream.ReadByte();

          }

        } catch { }

        return sb.ToString();

      }

      public void Update() {

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

          string s = ReadFirstLine(voltageStreams[i]);

          try {

            voltages[i] = 0.001f *

              long.Parse(s, CultureInfo.InvariantCulture);

          } catch {

            voltages[i] = null;

          }

        }

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

          string s = ReadFirstLine(temperatureStreams[i]);

          try {

            temperatures[i] = 0.001f *

              long.Parse(s, CultureInfo.InvariantCulture);

          } catch {

            temperatures[i] = null;

          }

        }

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

          string s = ReadFirstLine(fanStreams[i]);

          try {

            fans[i] = long.Parse(s, CultureInfo.InvariantCulture);

          } catch {

            fans[i] = null;

          }

        }

      }

      public void Close() {

        foreach (FileStream stream in voltageStreams)

          stream.Close();

        foreach (FileStream stream in temperatureStreams)

          stream.Close();

        foreach (FileStream stream in fanStreams)

          stream.Close();

      }

    }

  }

}