/*

  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): 

    Paul Werelds

    Roland Reinl <roland-reinl@gmx.de>

  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 OpenHardwareMonitor.Collections;

namespace OpenHardwareMonitor.Hardware.HDD {

  internal abstract class AbstractHarddrive : Hardware {

    private const int UPDATE_DIVIDER = 30; // update only every 30s

    // array of all harddrive types, matching type is searched in this order

    private static Type[] hddTypes = {       

      typeof(SSDPlextor),

      typeof(SSDIntel),

      typeof(SSDSandforce),

      typeof(SSDIndilinx),

      typeof(GenericHarddisk)

    };

    private readonly ISmart smart;

    private readonly IntPtr handle;

    private readonly int index;

    private int count;

    private IList<SmartAttribute> smartAttributes;

    private IDictionary<SmartAttribute, Sensor> sensors;

    protected AbstractHarddrive(ISmart smart, string name, int index, 

      IEnumerable<SmartAttribute> smartAttributes, ISettings settings) 

      : base(name, new Identifier("hdd",

        index.ToString(CultureInfo.InvariantCulture)), settings)

    {

      this.smart = smart;

      handle = smart.OpenDrive(index);

      smart.EnableSmart(handle, index);

      this.index = index;

      this.count = 0;

      this.smartAttributes = new List<SmartAttribute>(smartAttributes);

      CreateSensors();

    }

    public static AbstractHarddrive CreateInstance(ISmart smart, 

      int driveIndex, ISettings settings) 

    {

      IntPtr deviceHandle = smart.OpenDrive(driveIndex);

      if (deviceHandle == smart.InvalidHandle) 

        return null;

      string name = smart.ReadName(deviceHandle, driveIndex);

      bool smartEnabled = smart.EnableSmart(deviceHandle, driveIndex);

      DriveAttributeValue[] values = {};

      if (smartEnabled)

        values = smart.ReadSmartData(deviceHandle, driveIndex);

      smart.CloseHandle(deviceHandle);

      if (string.IsNullOrEmpty(name)) 

        return null;

      foreach (Type type in hddTypes) {

        // get the array of name prefixes for the current type

        NamePrefixAttribute[] namePrefixes = type.GetCustomAttributes(

          typeof(NamePrefixAttribute), true) as NamePrefixAttribute[];

        // get the array of the required SMART attributes for the current type

        RequireSmartAttribute[] requiredAttributes = type.GetCustomAttributes(

          typeof(RequireSmartAttribute), true) as RequireSmartAttribute[];

        // check if all required attributes are present

        bool allRequiredAttributesFound = true;

        foreach (var requireAttribute in requiredAttributes) {

          bool adttributeFound = false;

          foreach (DriveAttributeValue value in values) {

            if (value.Identifier == requireAttribute.AttributeId) {

              adttributeFound = true;

              break;

            }

          }

          if (!adttributeFound) {

            allRequiredAttributesFound = false;

            break;

          }

        }

        // if an attribute is missing, then try the next type

        if (!allRequiredAttributesFound)

          continue;        

        // check if there is a matching name prefix for this type

        foreach (NamePrefixAttribute prefix in namePrefixes) {

          if (name.StartsWith(prefix.Prefix, StringComparison.InvariantCulture)) 

            return Activator.CreateInstance(type, smart, name, driveIndex, 

              settings) as AbstractHarddrive;

        }

      }

      // no matching type has been found

      return null;

    }

    private void CreateSensors() {

      sensors = new Dictionary<SmartAttribute, Sensor>();

      IList<Pair<SensorType, int>> sensorTypeAndChannels = 

        new List<Pair<SensorType, int>>();

      DriveAttributeValue[] values = smart.ReadSmartData(handle, index);

      foreach (SmartAttribute attribute in smartAttributes) {

        if (!attribute.SensorType.HasValue) 

          continue;

        bool found = false;

        foreach (DriveAttributeValue value in values) {

          if (value.Identifier == attribute.Identifier) {

            found = true;

            break;

          }

        }

        if (!found)

          continue;

        Pair<SensorType, int> pair = new Pair<SensorType, int>(

          attribute.SensorType.Value, attribute.SensorChannel);

        if (!sensorTypeAndChannels.Contains(pair)) {

          Sensor sensor = new Sensor(attribute.Name, 

            attribute.SensorChannel, attribute.SensorType.Value, this, 

            settings);

          sensors.Add(attribute, sensor);

          sensorTypeAndChannels.Add(pair);

        }     

      }

    }

    public override HardwareType HardwareType {

      get { return HardwareType.HDD; }

    }

    public override ISensor[] Sensors {

      get {

        Sensor[] array = new Sensor[sensors.Count];

        sensors.Values.CopyTo(array, 0);

        return array;

      }

    }

    public override void Update() {

      if (count == 0) {

        DriveAttributeValue[] values = smart.ReadSmartData(handle, index);

        foreach (KeyValuePair<SmartAttribute, Sensor> keyValuePair in sensors) {

          SmartAttribute attribute = keyValuePair.Key;          

          foreach (DriveAttributeValue value in values) {

            if (value.Identifier == attribute.Identifier) {

              Sensor sensor = keyValuePair.Value;

              sensor.Value = attribute.ConvertValue(value);

            }

          }

        }        

      }

      count++; 

      count %= UPDATE_DIVIDER; 

    }

    public override string GetReport() {

      StringBuilder r = new StringBuilder();

      DriveAttributeValue[] values = smart.ReadSmartData(handle, index);

      DriveThresholdValue[] thresholds = 

        smart.ReadSmartThresholds(handle, index);

      if (values.Length > 0) {

        r.AppendLine(this.GetType().Name);

        r.AppendLine();

        r.AppendLine("Drive name: " + name);

        r.AppendLine();

        r.AppendFormat(CultureInfo.InvariantCulture, 

          " {0}{1}{2}{3}{4}{5}{6}{7}",

          ("ID").PadRight(3),

          ("Description").PadRight(32),

          ("Raw Value").PadRight(13),

          ("Worst").PadRight(6),

          ("Value").PadRight(6),

          ("Thres").PadRight(6),

          ("Physical").PadRight(8),

          Environment.NewLine);

        foreach (DriveAttributeValue value in values) {

          if (value.Identifier == 0x00) 

            break;

          byte? threshold = null;

          foreach (DriveThresholdValue t in thresholds) {

            if (t.Identifier == value.Identifier) {

              threshold = t.Threshold;

            }

          }

          string description = "Unknown";

          float? physical = null;

          foreach (SmartAttribute a in smartAttributes) {

            if (a.Identifier == value.Identifier) {

              description = a.Name;

              if (a.HasRawValueConversion | a.SensorType.HasValue)

                physical = a.ConvertValue(value);

              else

                physical = null;

            }

          }

          string raw = BitConverter.ToString(value.RawValue);

          r.AppendFormat(CultureInfo.InvariantCulture, 

            " {0}{1}{2}{3}{4}{5}{6}{7}",

            value.Identifier.ToString("X2").PadRight(3),

            description.PadRight(32),

            raw.Replace("-", "").PadRight(13),

            value.WorstValue.ToString(CultureInfo.InvariantCulture).PadRight(6),

            value.AttrValue.ToString(CultureInfo.InvariantCulture).PadRight(6),

            (threshold.HasValue ? threshold.Value.ToString(

              CultureInfo.InvariantCulture) : "-").PadRight(6),

            (physical.HasValue ? physical.Value.ToString(

              CultureInfo.InvariantCulture) : "-").PadRight(8),

            Environment.NewLine);

        }

        r.AppendLine();

      }

      return r.ToString();

    }

    protected static float RawToInt(byte[] raw, byte value) {

      return (raw[3] << 24) | (raw[2] << 16) | (raw[1] << 8) | raw[0];

    }

    public override void Close() {

      smart.CloseHandle(handle);

      base.Close();

    }

    public override void Traverse(IVisitor visitor) {

      foreach (ISensor sensor in Sensors)

        sensor.Accept(visitor);

    }

  }

}