//
// (C) Copyright 2003-2019 by Autodesk, Inc.
//
// Permission to use, copy, modify, and distribute this software in
// object code form for any purpose and without fee is hereby granted,
// provided that the above copyright notice appears in all copies and
// that both that copyright notice and the limited warranty and
// restricted rights notice below appear in all supporting
// documentation.
//
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// DOES NOT WARRANT THAT THE OPERATION OF THE PROGRAM WILL BE
// UNINTERRUPTED OR ERROR FREE.
//
// Use, duplication, or disclosure by the U.S. Government is subject to
// restrictions set forth in FAR 52.227-19 (Commercial Computer
// Software - Restricted Rights) and DFAR 252.227-7013(c)(1)(ii)
// (Rights in Technical Data and Computer Software), as applicable.
//

using System;
using System.Collections.Generic;
using System.Text;
using System.Configuration;
using System.Reflection;

using Autodesk.Revit;
using Autodesk.Revit.DB;

namespace Revit.SDK.Samples.CurtainWallGrid.CS
{
   /// <summary>
   /// Provides static functions to convert unit
   /// </summary>
   static class Unit
   {
      #region Methods
      /// <summary>
      /// Convert the value get from RevitAPI to the value indicated by ForgeTypeId
      /// </summary>
      /// <param name="to">
      /// ForgeTypeId indicates unit of target value
      /// </param>
      /// <param name="value">
      /// value get from RevitAPI
      /// </param>
      /// <returns>
      /// Target value
      /// </returns>
      public static double CovertFromAPI(ForgeTypeId to, double value)
      {
         return value *= ImperialDutRatio(to);
      }

      /// <summary>
      /// Convert a value indicated by ForgeTypeId to the value used by RevitAPI
      /// </summary>
      /// <param name="value">
      /// Value to be converted
      /// </param>
      /// <param name="from">
      /// ForgeTypeId indicates the unit of the value to be converted
      /// </param>
      /// <returns>
      /// Target value
      /// </returns>
      public static double CovertToAPI(double value, ForgeTypeId from)
      {
         return value /= ImperialDutRatio(from);
      }

      /// <summary>
      /// Get ratio between value in RevitAPI and value to display indicated by ForgeTypeId
      /// </summary>
      /// <param name="dut">
      /// ForgeTypeId indicates display unit type
      /// </param>
      /// <returns>
      /// Ratio 
      /// </returns>
      private static double ImperialDutRatio(ForgeTypeId unitTypeId)
      {
         if (unitTypeId == UnitTypeId.Feet) return 1;
         if (unitTypeId == UnitTypeId.FeetFractionalInches) return 1;
         if (unitTypeId == UnitTypeId.Inches) return 12;
         if (unitTypeId == UnitTypeId.FractionalInches) return 12;
         if (unitTypeId == UnitTypeId.Meters) return 0.3048;
         if (unitTypeId == UnitTypeId.Centimeters) return 30.48;
         if (unitTypeId == UnitTypeId.Millimeters) return 304.8;
         if (unitTypeId == UnitTypeId.MetersCentimeters) return 0.3048;
         return 1;
      }

      public static string GetUnitLabel(ForgeTypeId unitTypeId)
      {
         Dictionary<ForgeTypeId, string> unitLabels = new Dictionary<ForgeTypeId, string> {
            { UnitTypeId.Centimeters, "cm" },
            { UnitTypeId.Feet, "'" },
            { UnitTypeId.Inches, "\"" },
            { UnitTypeId.FeetFractionalInches, "'" },
            { UnitTypeId.FractionalInches, "\"" },
            { UnitTypeId.Meters, "m" },
            { UnitTypeId.MetersCentimeters, "m" },
            { UnitTypeId.Millimeters, "mm" }
         };
         if (unitLabels.ContainsKey(unitTypeId))
            return unitLabels[unitTypeId];
         return string.Empty;
      }
      #endregion
   }
}