#region CPL License
/*
Nuclex Framework
Copyright (C) 2002-2012 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

using System;
using System.Collections.Generic;

#if UNITTEST

using NUnit.Framework;

namespace Nuclex.Support.Collections {

  /// <summary>Unit Test for the Parenting Collection class</summary>
  [TestFixture]
  internal class ParentingCollectionTest {

    #region class TestParentable

    /// <summary>Parentable object that can be the child of an int</summary>
    private class TestParentable : Parentable<int>, IDisposable {

      /// <summary>Initializes a new instance of the parentable test class</summary>
      public TestParentable() { }

      /// <summary>The parent object that owns this instance</summary>
      public int GetParent() {
        return base.Parent;
      }

      /// <summary>Immediately releases all resources owned by the item</summary>
      public void Dispose() {
        this.disposeCalled = true;
      }

      /// <summary>Whether Dispose() has been called on this item</summary>
      public bool DisposeCalled {
        get { return this.disposeCalled; }
      }

      /// <summary>Whether Dispose() has been called on this item</summary>
      private bool disposeCalled;

    }

    #endregion // class TestParentable

    #region class TestParentingCollection

    /// <summary>Parentable object that can be the child of an int</summary>
    private class TestParentingCollection : ParentingCollection<int, TestParentable> {

      /// <summary>Changes the parent of the collection</summary>
      /// <param name="parent">New parent to assign to the collection</param>
      public void SetParent(int parent) {
        base.Reparent(parent);
      }

      /// <summary>Disposes all items contained in the collection</summary>
      public new void DisposeItems() {
        base.DisposeItems();
      }

    }

    #endregion // class TestParentingCollection

    /// <summary>
    ///   Tests whether the parenting collection propagates its parent to an item that
    ///   is added to the collection after the collection's aprent is already assigned
    /// </summary>
    [Test]
    public void TestPropagatePreassignedParent() {
      TestParentingCollection testCollection = new TestParentingCollection();
      TestParentable testParentable = new TestParentable();

      testCollection.SetParent(54321);
      testCollection.Add(testParentable);

      Assert.AreEqual(54321, testParentable.GetParent());
    }

    /// <summary>
    ///   Tests whether the parenting collection propagates a new parent to all items
    ///   contained in it when its parent is changed
    /// </summary>
    [Test]
    public void TestPropagateParentChange() {
      TestParentingCollection testCollection = new TestParentingCollection();
      TestParentable testParentable = new TestParentable();

      testCollection.Add(testParentable);
      testCollection.SetParent(54321);

      Assert.AreEqual(54321, testParentable.GetParent());
    }

    /// <summary>
    ///   Tests whether the parenting collection propagates its parent to an item that
    ///   is added to the collection after the collection's aprent is already assigned
    /// </summary>
    [Test]
    public void TestPropagateParentOnReplace() {
      TestParentingCollection testCollection = new TestParentingCollection();
      TestParentable testParentable1 = new TestParentable();
      TestParentable testParentable2 = new TestParentable();

      testCollection.SetParent(54321);
      testCollection.Add(testParentable1);
      testCollection[0] = testParentable2;

      Assert.AreEqual(0, testParentable1.GetParent());
      Assert.AreEqual(54321, testParentable2.GetParent());
    }

    /// <summary>
    ///   Tests whether the parenting collection unsets the parent when an item is removed
    ///   from the collection
    /// </summary>
    [Test]
    public void TestUnsetParentOnRemoveItem() {
      TestParentingCollection testCollection = new TestParentingCollection();
      TestParentable testParentable = new TestParentable();

      testCollection.Add(testParentable);
      testCollection.SetParent(54321);

      Assert.AreEqual(54321, testParentable.GetParent());

      testCollection.RemoveAt(0);

      Assert.AreEqual(0, testParentable.GetParent());
    }

    /// <summary>
    ///   Tests whether the parenting collection unsets the parent when all item are
    ///   removed from the collection by clearing it
    /// </summary>
    [Test]
    public void TestUnsetParentOnClear() {
      TestParentingCollection testCollection = new TestParentingCollection();
      TestParentable testParentable = new TestParentable();

      testCollection.Add(testParentable);
      testCollection.SetParent(54321);

      Assert.AreEqual(54321, testParentable.GetParent());

      testCollection.Clear();

      Assert.AreEqual(0, testParentable.GetParent());
    }

    /// <summary>
    ///   Tests whether the parenting collection calls Dispose() on all contained items
    ///   that implement IDisposable when its DisposeItems() method is called
    /// </summary>
    [Test]
    public void TestDisposeItems() {
      TestParentingCollection testCollection = new TestParentingCollection();
      TestParentable testParentable = new TestParentable();

      testCollection.Add(testParentable);

      testCollection.DisposeItems();

      Assert.IsTrue(testParentable.DisposeCalled);
    }

  }

} // namespace Nuclex.Support.Collections

#endif // UNITTEST