/*************************************************************************************

   Extended WPF Toolkit

   Copyright (C) 2007-2013 Xceed Software Inc.

   This program is provided to you under the terms of the Microsoft Public
   License (Ms-PL) as published at http://wpftoolkit.codeplex.com/license 

   For more features, controls, and fast professional support,
   pick up the Plus Edition at http://xceed.com/wpf_toolkit

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  ***********************************************************************************/

/**************************************************************************\
    Copyright Microsoft Corporation. All Rights Reserved.
\**************************************************************************/

// This file contains general utilities to aid in development.
// Classes here generally shouldn't be exposed publicly since
// they're not particular to any library functionality.
// Because the classes here are internal, it's likely this file
// might be included in multiple assemblies.
namespace Standard
{
  using System;
  using System.Diagnostics;
  using System.Diagnostics.CodeAnalysis;
  using System.Globalization;
  using System.IO;
  using System.Threading;

  /// <summary>
  /// A static class for retail validated assertions.
  /// Instead of breaking into the debugger an exception is thrown.
  /// </summary>
  internal static class Verify
  {
    /// <summary>
    /// Ensure that the current thread's apartment state is what's expected.
    /// </summary>
    /// <param name="requiredState">
    /// The required apartment state for the current thread.
    /// </param>
    /// <param name="message">
    /// The message string for the exception to be thrown if the state is invalid.
    /// </param>
    /// <exception cref="InvalidOperationException">
    /// Thrown if the calling thread's apartment state is not the same as the requiredState.
    /// </exception>
    [SuppressMessage( "Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode" )]
    [DebuggerStepThrough]
    public static void IsApartmentState( ApartmentState requiredState, string message )
    {
      if( Thread.CurrentThread.GetApartmentState() != requiredState )
      {
        throw new InvalidOperationException( message );
      }
    }

    /// <summary>
    /// Ensure that an argument is neither null nor empty.
    /// </summary>
    /// <param name="value">The string to validate.</param>
    /// <param name="name">The name of the parameter that will be presented if an exception is thrown.</param>
    [SuppressMessage( "Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode" )]
    [SuppressMessage( "Microsoft.Performance", "CA1820:TestForEmptyStringsUsingStringLength" )]
    [DebuggerStepThrough]
    public static void IsNeitherNullNorEmpty( string value, string name )
    {
      // catch caller errors, mixing up the parameters.  Name should never be empty.
      Assert.IsNeitherNullNorEmpty( name );

      // Notice that ArgumentNullException and ArgumentException take the parameters in opposite order :P
      const string errorMessage = "The parameter can not be either null or empty.";
      if( null == value )
      {
        throw new ArgumentNullException( name, errorMessage );
      }
      if( "" == value )
      {
        throw new ArgumentException( errorMessage, name );
      }
    }

    /// <summary>
    /// Ensure that an argument is neither null nor does it consist only of whitespace.
    /// </summary>
    /// <param name="value">The string to validate.</param>
    /// <param name="name">The name of the parameter that will be presented if an exception is thrown.</param>
    [SuppressMessage( "Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode" )]
    [SuppressMessage( "Microsoft.Performance", "CA1820:TestForEmptyStringsUsingStringLength" )]
    [DebuggerStepThrough]
    public static void IsNeitherNullNorWhitespace( string value, string name )
    {
      // catch caller errors, mixing up the parameters.  Name should never be empty.
      Assert.IsNeitherNullNorEmpty( name );

      // Notice that ArgumentNullException and ArgumentException take the parameters in opposite order :P
      const string errorMessage = "The parameter can not be either null or empty or consist only of white space characters.";
      if( null == value )
      {
        throw new ArgumentNullException( name, errorMessage );
      }
      if( "" == value.Trim() )
      {
        throw new ArgumentException( errorMessage, name );
      }
    }

    /// <summary>Verifies that an argument is not null.</summary>
    /// <typeparam name="T">Type of the object to validate.  Must be a class.</typeparam>
    /// <param name="obj">The object to validate.</param>
    /// <param name="name">The name of the parameter that will be presented if an exception is thrown.</param>
    [SuppressMessage( "Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode" )]
    [DebuggerStepThrough]
    public static void IsNotDefault<T>( T obj, string name ) where T : struct
    {
      if( default( T ).Equals( obj ) )
      {
        throw new ArgumentException( "The parameter must not be the default value.", name );
      }
    }

    /// <summary>Verifies that an argument is not null.</summary>
    /// <typeparam name="T">Type of the object to validate.  Must be a class.</typeparam>
    /// <param name="obj">The object to validate.</param>
    /// <param name="name">The name of the parameter that will be presented if an exception is thrown.</param>
    [SuppressMessage( "Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode" )]
    [DebuggerStepThrough]
    public static void IsNotNull<T>( T obj, string name ) where T : class
    {
      if( null == obj )
      {
        throw new ArgumentNullException( name );
      }
    }

    /// <summary>Verifies that an argument is null.</summary>
    /// <typeparam name="T">Type of the object to validate.  Must be a class.</typeparam>
    /// <param name="obj">The object to validate.</param>
    /// <param name="name">The name of the parameter that will be presented if an exception is thrown.</param>
    [SuppressMessage( "Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode" )]
    [DebuggerStepThrough]
    public static void IsNull<T>( T obj, string name ) where T : class
    {
      if( null != obj )
      {
        throw new ArgumentException( "The parameter must be null.", name );
      }
    }

    [SuppressMessage( "Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode" )]
    [DebuggerStepThrough]
    public static void PropertyIsNotNull<T>( T obj, string name ) where T : class
    {
      if( null == obj )
      {
        throw new InvalidOperationException( string.Format( CultureInfo.InvariantCulture, "The property {0} cannot be null at this time.", name ) );
      }
    }

    [SuppressMessage( "Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode" )]
    [DebuggerStepThrough]
    public static void PropertyIsNull<T>( T obj, string name ) where T : class
    {
      if( null != obj )
      {
        throw new InvalidOperationException( string.Format( CultureInfo.InvariantCulture, "The property {0} must be null at this time.", name ) );
      }
    }

    /// <summary>
    /// Verifies the specified statement is true.  Throws an ArgumentException if it's not.
    /// </summary>
    /// <param name="statement">The statement to be verified as true.</param>
    /// <param name="name">Name of the parameter to include in the ArgumentException.</param>
    [SuppressMessage( "Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode" )]
    [DebuggerStepThrough]
    public static void IsTrue( bool statement, string name )
    {
      if( !statement )
      {
        throw new ArgumentException( "", name );
      }
    }

    /// <summary>
    /// Verifies the specified statement is true.  Throws an ArgumentException if it's not.
    /// </summary>
    /// <param name="statement">The statement to be verified as true.</param>
    /// <param name="name">Name of the parameter to include in the ArgumentException.</param>
    /// <param name="message">The message to include in the ArgumentException.</param>
    [SuppressMessage( "Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode" )]
    [DebuggerStepThrough]
    public static void IsTrue( bool statement, string name, string message )
    {
      if( !statement )
      {
        throw new ArgumentException( message, name );
      }
    }

    [SuppressMessage( "Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode" )]
    [DebuggerStepThrough]
    public static void AreEqual<T>( T expected, T actual, string parameterName, string message )
    {
      if( null == expected )
      {
        // Two nulls are considered equal, regardless of type semantics.
        if( null != actual && !actual.Equals( expected ) )
        {
          throw new ArgumentException( message, parameterName );
        }
      }
      else if( !expected.Equals( actual ) )
      {
        throw new ArgumentException( message, parameterName );
      }
    }

    [SuppressMessage( "Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode" )]
    [DebuggerStepThrough]
    public static void AreNotEqual<T>( T notExpected, T actual, string parameterName, string message )
    {
      if( null == notExpected )
      {
        // Two nulls are considered equal, regardless of type semantics.
        if( null == actual || actual.Equals( notExpected ) )
        {
          throw new ArgumentException( message, parameterName );
        }
      }
      else if( notExpected.Equals( actual ) )
      {
        throw new ArgumentException( message, parameterName );
      }
    }

    [SuppressMessage( "Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode" )]
    [DebuggerStepThrough]
    public static void UriIsAbsolute( Uri uri, string parameterName )
    {
      Verify.IsNotNull( uri, parameterName );
      if( !uri.IsAbsoluteUri )
      {
        throw new ArgumentException( "The URI must be absolute.", parameterName );
      }
    }

    /// <summary>
    /// Verifies that the specified value is within the expected range.  The assertion fails if it isn't.
    /// </summary>
    /// <param name="lowerBoundInclusive">The lower bound inclusive value.</param>
    /// <param name="value">The value to verify.</param>
    /// <param name="upperBoundExclusive">The upper bound exclusive value.</param>
    [SuppressMessage( "Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode" )]
    [DebuggerStepThrough]
    public static void BoundedInteger( int lowerBoundInclusive, int value, int upperBoundExclusive, string parameterName )
    {
      if( value < lowerBoundInclusive || value >= upperBoundExclusive )
      {
        throw new ArgumentException( string.Format( CultureInfo.InvariantCulture, "The integer value must be bounded with [{0}, {1})", lowerBoundInclusive, upperBoundExclusive ), parameterName );
      }
    }

    [SuppressMessage( "Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode" )]
    [DebuggerStepThrough]
    public static void BoundedDoubleInc( double lowerBoundInclusive, double value, double upperBoundInclusive, string message, string parameter )
    {
      if( value < lowerBoundInclusive || value > upperBoundInclusive )
      {
        throw new ArgumentException( message, parameter );
      }
    }

    [SuppressMessage( "Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode" )]
    [DebuggerStepThrough]
    public static void TypeSupportsInterface( Type type, Type interfaceType, string parameterName )
    {
      Assert.IsNeitherNullNorEmpty( parameterName );
      Verify.IsNotNull( type, "type" );
      Verify.IsNotNull( interfaceType, "interfaceType" );

      if( type.GetInterface( interfaceType.Name ) == null )
      {
        throw new ArgumentException( "The type of this parameter does not support a required interface", parameterName );
      }
    }

    [SuppressMessage( "Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode" )]
    [DebuggerStepThrough]
    public static void FileExists( string filePath, string parameterName )
    {
      Verify.IsNeitherNullNorEmpty( filePath, parameterName );
      if( !File.Exists( filePath ) )
      {
        throw new ArgumentException( string.Format( CultureInfo.InvariantCulture, "No file exists at \"{0}\"", filePath ), parameterName );
      }
    }

    [SuppressMessage( "Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode" )]
    [DebuggerStepThrough]
    internal static void ImplementsInterface( object parameter, Type interfaceType, string parameterName )
    {
      Assert.IsNotNull( parameter );
      Assert.IsNotNull( interfaceType );
      Assert.IsTrue( interfaceType.IsInterface );

      bool isImplemented = false;
      foreach( var ifaceType in parameter.GetType().GetInterfaces() )
      {
        if( ifaceType == interfaceType )
        {
          isImplemented = true;
          break;
        }
      }

      if( !isImplemented )
      {
        throw new ArgumentException( string.Format( CultureInfo.InvariantCulture, "The parameter must implement interface {0}.", interfaceType.ToString() ), parameterName );
      }
    }
  }
}