#region CPL License
/*
Nuclex Framework
Copyright (C) 2002-2017 Nuclex Development Labs

This library is free software; you can redistribute it and/or
modify it under the terms of the IBM Common Public License as
published by the IBM Corporation; either version 1.0 of the
License, or (at your option) any later version.

This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
IBM Common Public License for more details.

You should have received a copy of the IBM Common Public
License along with this library
*/
#endregion

#if UNITTEST

using System;
using System.Reflection;

using NUnit.Framework;

namespace Nuclex.Support {

  /// <summary>Unit Test for the strign segment class</summary>
  [TestFixture]
  internal class TypeHelperTest {

    #region class NoDefaultConstructor

    /// <summary>Test class that doesn't have a default constructor</summary>
    private class NoDefaultConstructor {
      /// <summary>Initializes a new instance of the test class</summary>
      /// <param name="dummy">Dummy argument so this is no default constructor</param>
      public NoDefaultConstructor(int dummy) { }
    }

    #endregion // class NoDefaultConstructor

    #region class NonPublicDefaultConstructor

    /// <summary>Test class that has a non-public default constructor</summary>
    private class NonPublicDefaultConstructor {
      /// <summary>Initializes a new instance of the test class</summary>
      protected NonPublicDefaultConstructor() { }
    }

    #endregion // class NonPublicDefaultConstructor

    #region class PublicDefaultConstructor

    /// <summary>Test class that has a public default constructor</summary>
    private class PublicDefaultConstructor {
      /// <summary>Initializes a new instance of the test class</summary>
      public PublicDefaultConstructor() { }
    }

    #endregion // class PublicDefaultConstructor

    #region class Base

    /// <summary>Base class used to test the helper methods</summary>
    private class Base {
      /// <summary>A simple public field</summary>
      public int PublicBaseField;
      /// <summary>An automatic property with a hidden backing field</summary>
      public int PublicBaseProperty { get; set; }
    }

    #endregion // class Base

    #region class Derived

    /// <summary>Derived class used to test the helper methods</summary>
    private class Derived : Base {
      /// <summary>A simple public field</summary>
      public int PublicDerivedField;
      /// <summary>An automatic property with a hidden backing field</summary>
      public int PublicDerivedProperty { get; set; }
    }

    #endregion // class Derived

    #region class HasIgnoreAttribute

    /// <summary>Class that carries an IgnoreAttribute</summary>
    [Ignore]
    private class HasIgnoreAttribute { }

    #endregion // class HasIgnoreAttribute

    /// <summary>
    ///   Verifies that the type helper can determine whether a class is carrying an attribute
    /// </summary>
    [Test]
    public void CanDetermineIfTypeHasAttribute() {
      Assert.IsTrue(typeof(HasIgnoreAttribute).HasAttribute<IgnoreAttribute>());
      Assert.IsFalse(typeof(HasIgnoreAttribute).HasAttribute<TestAttribute>());
    }

    /// <summary>
    ///   Verifies that the GetFieldInfosIncludingBaseClasses() will include the backing
    ///   fields of automatically implemented properties in base classes
    /// </summary>
    [Test]
    public void CanGetBackingFieldsForPropertiesInBaseClasses() {
      FieldInfo[] fieldInfos = typeof(Derived).GetFieldInfosIncludingBaseClasses(
        BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance
      );
      Assert.AreEqual(4, fieldInfos.Length);
    }

    /// <summary>
    ///   Useless test that avoids a compile warning about unused fields
    /// </summary>
    [Test]
    public void AvoidCompilerWarnings() {
      var derived = new Derived() {
        PublicBaseField = 123,
        PublicBaseProperty = 321,
        PublicDerivedField = 456
      };
    }

    /// <summary>Tests whether the default constructor detection works as expected</summary>
    [Test]
    public void TestDefaultConstructorDetection() {
      Assert.IsFalse(typeof(NoDefaultConstructor).HasDefaultConstructor());
      Assert.IsFalse(typeof(NonPublicDefaultConstructor).HasDefaultConstructor());
      Assert.IsTrue(typeof(PublicDefaultConstructor).HasDefaultConstructor());
    }

  }

} // namespace Nuclex.Support

#endif // UNITTEST