// Copyright (C) Stichting Deltares 2016. All rights reserved.
//
// This file is part of Ringtoets.
//
// Ringtoets is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// 
// This program 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
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
//
// All names, logos, and references to "Deltares" are registered trademarks of
// Stichting Deltares and remain full property of Stichting Deltares at all times.
// All rights reserved.

using System;
using System.IO;
using System.Linq;
using System.Windows.Forms;
using Core.Common.Base;
using Core.Common.Base.Geometry;
using Core.Common.Controls.TreeView;
using Core.Common.Gui;
using Core.Common.Gui.ContextMenu;
using Core.Common.Gui.Forms.MainWindow;
using Core.Common.Gui.TestUtil.ContextMenu;
using Core.Common.TestUtil;
using NUnit.Extensions.Forms;
using NUnit.Framework;
using Rhino.Mocks;
using Ringtoets.ClosingStructures.Data;
using Ringtoets.ClosingStructures.Data.TestUtil;
using Ringtoets.ClosingStructures.Forms.PresentationObjects;
using Ringtoets.ClosingStructures.Plugin;
using Ringtoets.Common.Data;
using Ringtoets.Common.Data.AssessmentSection;
using Ringtoets.Common.Data.Calculation;
using Ringtoets.Common.Data.Contribution;
using Ringtoets.Common.Data.FailureMechanism;
using Ringtoets.Common.Data.Hydraulics;
using Ringtoets.Common.Data.Probability;
using Ringtoets.Common.Data.Structures;
using Ringtoets.HydraRing.Calculation.TestUtil.Calculator;
using RingtoetsCommonFormsResources = Ringtoets.Common.Forms.Properties.Resources;
using RingtoetsCommonServicesResources = Ringtoets.Common.Service.Properties.Resources;

namespace Ringtoets.ClosingStructures.Forms.Test.TreeNodeInfos
{
    [TestFixture]
    public class ClosingStructuresCalculationContextTreeNodeInfoTest : NUnitFormTest
    {
        private const int contextMenuValidateIndex = 0;
        private const int contextMenuCalculateIndex = 1;
        private const int contextMenuClearIndex = 2;
        private readonly string testDataPath = TestHelper.GetTestDataPath(TestDataPath.Ringtoets.Common.IO, "HydraulicBoundaryDatabaseImporter");

        private IGui guiMock;
        private TreeNodeInfo info;
        private MockRepository mocks;
        private ClosingStructuresPlugin plugin;

        [SetUp]
        public void SetUp()
        {
            mocks = new MockRepository();
            guiMock = mocks.Stub<IGui>();
            plugin = new ClosingStructuresPlugin
            {
                Gui = guiMock
            };

            info = plugin.GetTreeNodeInfos().First(tni => tni.TagType == typeof(ClosingStructuresCalculationContext));
        }

        [TearDown]
        public override void TearDown()
        {
            plugin.Dispose();
            mocks.VerifyAll();
        }

        [Test]
        public void Initialized_Always_ExpectedPropertiesSet()
        {
            // Setup
            mocks.ReplayAll();

            // Assert
            Assert.AreEqual(typeof(ClosingStructuresCalculationContext), info.TagType);
            Assert.IsNotNull(info.Text);
            Assert.IsNotNull(info.Image);
            Assert.IsNotNull(info.EnsureVisibleOnCreate);
            Assert.IsNotNull(info.ChildNodeObjects);
            Assert.IsNotNull(info.ContextMenuStrip);
            Assert.IsNotNull(info.CanRename);
            Assert.IsNotNull(info.OnNodeRenamed);
            Assert.IsNotNull(info.CanRemove);
            Assert.IsNotNull(info.OnNodeRemoved);
            Assert.IsNotNull(info.CanDrag);
            Assert.IsNull(info.ForeColor);
            Assert.IsNull(info.CanCheck);
            Assert.IsNull(info.IsChecked);
            Assert.IsNull(info.OnNodeChecked);
            Assert.IsNull(info.CanDrop);
            Assert.IsNull(info.CanInsert);
            Assert.IsNull(info.OnDrop);
        }

        [Test]
        public void Image_Always_ReturnsCalculationIcon()
        {
            // Setup
            mocks.ReplayAll();

            // Call
            var image = info.Image(null);

            // Assert
            TestHelper.AssertImagesAreEqual(RingtoetsCommonFormsResources.CalculationIcon, image);
        }

        [Test]
        public void ChildNodeObjects_CalculationWithoutOutput_ReturnCollectionWithEmptyOutputObject()
        {
            var assessmentSectionStub = mocks.Stub<IAssessmentSection>();
            mocks.ReplayAll();

            var failureMechanism = new ClosingStructuresFailureMechanism();
            var calculation = new StructuresCalculation<ClosingStructuresInput>();
            var calculationContext = new ClosingStructuresCalculationContext(calculation, failureMechanism, assessmentSectionStub);

            // Call
            var children = info.ChildNodeObjects(calculationContext).ToArray();

            // Assert
            Assert.AreEqual(3, children.Length);

            var comment = children[0] as Comment;
            Assert.AreSame(calculationContext.WrappedData.Comments, comment);

            var closingStructuresInputContext = children[1] as ClosingStructuresInputContext;
            Assert.IsNotNull(closingStructuresInputContext);
            Assert.AreSame(calculationContext.WrappedData.InputParameters, closingStructuresInputContext.WrappedData);

            Assert.IsInstanceOf<EmptyProbabilityAssessmentOutput>(children[2]);
        }

        [Test]
        public void ChildNodeObjects_CalculationWithOutput_ReturnCollectionWithOutputObject()
        {
            var assessmentSectionStub = mocks.Stub<IAssessmentSection>();
            mocks.ReplayAll();

            var failureMechanism = new ClosingStructuresFailureMechanism();
            var calculation = new StructuresCalculation<ClosingStructuresInput>
            {
                Output = new TestClosingStructuresOutput()
            };

            var calculationContext = new ClosingStructuresCalculationContext(calculation, failureMechanism, assessmentSectionStub);

            // Call
            var children = info.ChildNodeObjects(calculationContext).ToArray();

            // Assert
            Assert.AreEqual(3, children.Length);

            var comment = children[0] as Comment;
            Assert.AreSame(calculationContext.WrappedData.Comments, comment);

            var closingStructuresInputContext = children[1] as ClosingStructuresInputContext;
            Assert.IsNotNull(closingStructuresInputContext);
            Assert.AreSame(calculationContext.WrappedData.InputParameters, closingStructuresInputContext.WrappedData);

            Assert.IsInstanceOf<ProbabilityAssessmentOutput>(children[2]);
        }

        [Test]
        public void ContextMenuStrip_Always_CallsContextMenuBuilderMethods()
        {
            // Setup
            var failureMechanism = new ClosingStructuresFailureMechanism();
            var assessmentSectionStub = mocks.Stub<IAssessmentSection>();
            var calculation = new StructuresCalculation<ClosingStructuresInput>();
            var nodeData = new ClosingStructuresCalculationContext(calculation, failureMechanism, assessmentSectionStub);
            var menuBuilderMock = mocks.StrictMock<IContextMenuBuilder>();

            menuBuilderMock.Expect(mb => mb.AddCustomItem(null)).IgnoreArguments().Return(menuBuilderMock);
            menuBuilderMock.Expect(mb => mb.AddCustomItem(null)).IgnoreArguments().Return(menuBuilderMock);
            menuBuilderMock.Expect(mb => mb.AddCustomItem(null)).IgnoreArguments().Return(menuBuilderMock);
            menuBuilderMock.Expect(mb => mb.AddSeparator()).Return(menuBuilderMock);
            menuBuilderMock.Expect(mb => mb.AddRenameItem()).Return(menuBuilderMock);
            menuBuilderMock.Expect(mb => mb.AddDeleteItem()).Return(menuBuilderMock);
            menuBuilderMock.Expect(mb => mb.AddSeparator()).Return(menuBuilderMock);
            menuBuilderMock.Expect(mb => mb.AddExpandAllItem()).Return(menuBuilderMock);
            menuBuilderMock.Expect(mb => mb.AddCollapseAllItem()).Return(menuBuilderMock);
            menuBuilderMock.Expect(mb => mb.AddSeparator()).Return(menuBuilderMock);
            menuBuilderMock.Expect(mb => mb.AddPropertiesItem()).Return(menuBuilderMock);
            menuBuilderMock.Expect(mb => mb.Build()).Return(null);

            using (var treeViewControl = new TreeViewControl())
            {
                guiMock.Expect(cmp => cmp.Get(nodeData, treeViewControl)).Return(menuBuilderMock);

                mocks.ReplayAll();

                plugin.Gui = guiMock;

                // Call
                info.ContextMenuStrip(nodeData, null, treeViewControl);
            }
            // Assert
            // Assert expectancies are called in TearDown()
        }

        [Test]
        public void ContextMenuStrip_Always_AddCustomItems()
        {
            // Setup
            var failureMechanism = new ClosingStructuresFailureMechanism();
            var assessmentSectionStub = mocks.Stub<IAssessmentSection>();
            var calculation = new StructuresCalculation<ClosingStructuresInput>();
            var nodeData = new ClosingStructuresCalculationContext(calculation, failureMechanism, assessmentSectionStub);
            var menuBuilder = new CustomItemsOnlyContextMenuBuilder();

            using (var treeViewControl = new TreeViewControl())
            {
                guiMock.Expect(cmp => cmp.Get(nodeData, treeViewControl)).Return(menuBuilder);

                mocks.ReplayAll();

                plugin.Gui = guiMock;

                // Call
                using (ContextMenuStrip menu = info.ContextMenuStrip(nodeData, assessmentSectionStub, treeViewControl))
                {
                    // Assert
                    Assert.AreEqual(11, menu.Items.Count);

                    TestHelper.AssertContextMenuStripContainsItem(menu, contextMenuValidateIndex,
                                                                  "&Valideren",
                                                                  "Er is geen vakindeling geïmporteerd.",
                                                                  RingtoetsCommonFormsResources.ValidateIcon,
                                                                  false);

                    TestHelper.AssertContextMenuStripContainsItem(menu, contextMenuCalculateIndex,
                                                                  "Be&rekenen",
                                                                  "Er is geen vakindeling geïmporteerd.",
                                                                  RingtoetsCommonFormsResources.CalculateIcon,
                                                                  false);

                    TestHelper.AssertContextMenuStripContainsItem(menu, contextMenuClearIndex,
                                                                  "&Wis uitvoer...",
                                                                  "Deze berekening heeft geen uitvoer om te wissen.",
                                                                  RingtoetsCommonFormsResources.ClearIcon,
                                                                  false);
                }
            }
        }

        [Test]
        public void ContextMenuStrip_NoFailureMechanismSections_ContextMenuItemPerformCalculationAndValidationDisabledAndTooltipSet()
        {
            // Setup
            var failureMechanism = new ClosingStructuresFailureMechanism();
            var assessmentSectionStub = mocks.Stub<IAssessmentSection>();
            var calculation = new StructuresCalculation<ClosingStructuresInput>();

            var nodeData = new ClosingStructuresCalculationContext(calculation, failureMechanism, assessmentSectionStub);

            using (var treeViewControl = new TreeViewControl())
            {
                guiMock.Expect(cmp => cmp.Get(nodeData, treeViewControl)).Return(new CustomItemsOnlyContextMenuBuilder());

                mocks.ReplayAll();

                plugin.Gui = guiMock;

                // Call
                using (ContextMenuStrip contextMenu = info.ContextMenuStrip(nodeData, null, treeViewControl))
                {
                    // Assert
                    TestHelper.AssertContextMenuStripContainsItem(contextMenu, contextMenuCalculateIndex,
                                                                  "Be&rekenen",
                                                                  "Er is geen vakindeling geïmporteerd.",
                                                                  RingtoetsCommonFormsResources.CalculateIcon,
                                                                  false);

                    TestHelper.AssertContextMenuStripContainsItem(contextMenu, contextMenuValidateIndex,
                                                                  "&Valideren",
                                                                  "Er is geen vakindeling geïmporteerd.",
                                                                  RingtoetsCommonFormsResources.ValidateIcon,
                                                                  false);
                }
            }
        }

        [Test]
        public void ContextMenuStrip_FailureMechanismSectionsSetNoHydraulicBoundaryDatabase_ContextMenuItemPerformCalculationAndValidationDisabledAndTooltipSet()
        {
            // Setup
            var failureMechanism = new ClosingStructuresFailureMechanism();
            failureMechanism.AddSection(new FailureMechanismSection("test", new[]
            {
                new Point2D(0, 0)
            }));

            var assessmentSectionStub = mocks.Stub<IAssessmentSection>();

            var calculation = new StructuresCalculation<ClosingStructuresInput>();
            var nodeData = new ClosingStructuresCalculationContext(calculation, failureMechanism, assessmentSectionStub);

            using (var treeViewControl = new TreeViewControl())
            {
                guiMock.Expect(cmp => cmp.Get(nodeData, treeViewControl)).Return(new CustomItemsOnlyContextMenuBuilder());

                mocks.ReplayAll();

                plugin.Gui = guiMock;

                // Call
                using (ContextMenuStrip contextMenu = info.ContextMenuStrip(nodeData, null, treeViewControl))
                {
                    // Assert
                    TestHelper.AssertContextMenuStripContainsItem(contextMenu, contextMenuCalculateIndex,
                                                                  "Be&rekenen",
                                                                  "Er is geen hydraulische randvoorwaardendatabase geïmporteerd.",
                                                                  RingtoetsCommonFormsResources.CalculateIcon,
                                                                  false);

                    TestHelper.AssertContextMenuStripContainsItem(contextMenu, contextMenuValidateIndex,
                                                                  "&Valideren",
                                                                  "Er is geen hydraulische randvoorwaardendatabase geïmporteerd.",
                                                                  RingtoetsCommonFormsResources.ValidateIcon,
                                                                  false);
                }
            }
        }

        [Test]
        public void ContextMenuStrip_FailureMechanismSectionsSetHydraulicBoundaryDatabaseNotValid_ContextMenuItemPerformCalculationAndValidationDisabledAndTooltipSet()
        {
            // Setup
            var failureMechanism = new ClosingStructuresFailureMechanism();
            failureMechanism.AddSection(new FailureMechanismSection("test", new[]
            {
                new Point2D(0, 0)
            }));

            var assessmentSectionStub = mocks.Stub<IAssessmentSection>();
            assessmentSectionStub.HydraulicBoundaryDatabase = new HydraulicBoundaryDatabase();

            var calculation = new StructuresCalculation<ClosingStructuresInput>();
            var nodeData = new ClosingStructuresCalculationContext(calculation, failureMechanism, assessmentSectionStub);

            using (var treeViewControl = new TreeViewControl())
            {
                guiMock.Expect(cmp => cmp.Get(nodeData, treeViewControl)).Return(new CustomItemsOnlyContextMenuBuilder());

                mocks.ReplayAll();

                plugin.Gui = guiMock;

                // Call
                using (ContextMenuStrip contextMenu = info.ContextMenuStrip(nodeData, null, treeViewControl))
                {
                    // Assert
                    ToolStripItem calculateContextMenuItem = contextMenu.Items[contextMenuCalculateIndex];

                    Assert.AreEqual("Be&rekenen", calculateContextMenuItem.Text);
                    Assert.AreEqual("Er moet een koppeling bestaan met een hydraulische randvoorwaardendatabase.", calculateContextMenuItem.ToolTipText);
                    TestHelper.AssertImagesAreEqual(RingtoetsCommonFormsResources.CalculateIcon, calculateContextMenuItem.Image);
                    Assert.IsFalse(calculateContextMenuItem.Enabled);

                    ToolStripItem validateContextMenuItem = contextMenu.Items[contextMenuValidateIndex];

                    Assert.AreEqual("&Valideren", validateContextMenuItem.Text);
                    Assert.AreEqual("Er moet een koppeling bestaan met een hydraulische randvoorwaardendatabase.", validateContextMenuItem.ToolTipText);
                    TestHelper.AssertImagesAreEqual(RingtoetsCommonFormsResources.ValidateIcon, validateContextMenuItem.Image);
                    Assert.IsFalse(validateContextMenuItem.Enabled);
                }
            }
        }

        [Test]
        public void ContextMenuStrip_FailureMechanismSectionsAndHydraulicBoundaryDatabaseSet_ContextMenuItemPerformCalculationAndValidationEnabled()
        {
            // Setup
            string validFilePath = Path.Combine(testDataPath, "complete.sqlite");

            var hydraulicBoundaryDatabase = new HydraulicBoundaryDatabase
            {
                FilePath = validFilePath,
                Version = "1.0"
            };

            var failureMechanism = new ClosingStructuresFailureMechanism();
            failureMechanism.AddSection(new FailureMechanismSection("test", new[]
            {
                new Point2D(0, 0)
            }));

            var assessmentSectionStub = mocks.Stub<IAssessmentSection>();
            assessmentSectionStub.HydraulicBoundaryDatabase = hydraulicBoundaryDatabase;

            var calculation = new StructuresCalculation<ClosingStructuresInput>();
            var nodeData = new ClosingStructuresCalculationContext(calculation, failureMechanism, assessmentSectionStub);

            using (var treeViewControl = new TreeViewControl())
            {
                guiMock.Expect(cmp => cmp.Get(nodeData, treeViewControl)).Return(new CustomItemsOnlyContextMenuBuilder());

                mocks.ReplayAll();

                plugin.Gui = guiMock;

                // Call
                using (ContextMenuStrip contextMenu = info.ContextMenuStrip(nodeData, null, treeViewControl))
                {
                    // Assert
                    TestHelper.AssertContextMenuStripContainsItem(contextMenu, contextMenuCalculateIndex,
                                                                  "Be&rekenen",
                                                                  "Voer deze berekening uit.",
                                                                  RingtoetsCommonFormsResources.CalculateIcon);

                    TestHelper.AssertContextMenuStripContainsItem(contextMenu, contextMenuValidateIndex,
                                                                  "&Valideren",
                                                                  "Valideer de invoer voor deze berekening.",
                                                                  RingtoetsCommonFormsResources.ValidateIcon);
                }
            }
        }

        [Test]
        public void GivenSuccessfulCalculation_WhenCalculatingFromContextMenu_ThenOutputSetLogMessagesAddedAndUpdateObserver()
        {
            // Given
            var mainWindow = mocks.Stub<IMainWindow>();
            var observerMock = mocks.StrictMock<IObserver>();
            observerMock.Expect(o => o.UpdateObserver());

            var section = new FailureMechanismSection("A", new[]
            {
                new Point2D(1, 2),
                new Point2D(3, 4)
            });

            var failureMechanism = new ClosingStructuresFailureMechanism();
            failureMechanism.AddSection(section);

            string validFilePath = Path.Combine(testDataPath, "complete.sqlite");

            var hydraulicBoundaryLocation = new HydraulicBoundaryLocation(1, string.Empty, 0.0, 1.1);
            var hydraulicBoundaryDatabase = new HydraulicBoundaryDatabase
            {
                FilePath = validFilePath,
                Version = "random"
            };
            hydraulicBoundaryDatabase.Locations.Add(hydraulicBoundaryLocation);

            var assessmentSectionStub = mocks.Stub<IAssessmentSection>();
            assessmentSectionStub.HydraulicBoundaryDatabase = hydraulicBoundaryDatabase;
            assessmentSectionStub.Stub(a => a.Id).Return(string.Empty);
            assessmentSectionStub.Stub(a => a.FailureMechanismContribution).Return(new FailureMechanismContribution(Enumerable.Empty<IFailureMechanism>(), 1, 1));

            var initialOutput = new ProbabilityAssessmentOutput(double.NaN, double.NaN, double.NaN, double.NaN, double.NaN);
            var calculation = new TestClosingStructuresCalculation
            {
                Output = initialOutput,
                InputParameters =
                {
                    HydraulicBoundaryLocation = hydraulicBoundaryLocation
                }
            };

            var calculationContext = new ClosingStructuresCalculationContext(calculation, failureMechanism, assessmentSectionStub);

            using (var treeViewControl = new TreeViewControl())
            {
                guiMock.Expect(g => g.Get(calculationContext, treeViewControl)).Return(new CustomItemsOnlyContextMenuBuilder());
                guiMock.Expect(g => g.MainWindow).Return(mainWindow);

                mocks.ReplayAll();

                plugin.Gui = guiMock;

                calculation.Attach(observerMock);

                DialogBoxHandler = (name, wnd) =>
                {
                    // Expect an activity dialog which is automatically closed
                };

                using (ContextMenuStrip contextMenuStrip = info.ContextMenuStrip(calculationContext, null, treeViewControl))
                using (new HydraRingCalculatorFactoryConfig())
                {
                    // When
                    Action action = () => contextMenuStrip.Items[contextMenuCalculateIndex].PerformClick();

                    // Then
                    TestHelper.AssertLogMessages(action, messages =>
                    {
                        var msgs = messages.ToArray();
                        Assert.AreEqual(6, msgs.Length);
                        StringAssert.StartsWith(string.Format("Validatie van '{0}' gestart om: ", calculation.Name), msgs[0]);
                        StringAssert.StartsWith(string.Format("Validatie van '{0}' beëindigd om: ", calculation.Name), msgs[1]);
                        StringAssert.StartsWith(string.Format("Berekening van '{0}' gestart om: ", calculation.Name), msgs[2]);
                        StringAssert.StartsWith("Betrouwbaarheid sluiting kunstwerk berekening is uitgevoerd op de tijdelijke locatie", msgs[3]);
                        StringAssert.StartsWith(string.Format("Berekening van '{0}' beëindigd om: ", calculation.Name), msgs[4]);
                        StringAssert.StartsWith(string.Format("Uitvoeren van '{0}' is gelukt.", calculation.Name), msgs[5]);
                    });

                    Assert.AreNotSame(initialOutput, calculation.Output);
                }
            }
        }

        [Test]
        public void GivenCalculationWithNonExistingFilePath_WhenValidatingFromContextMenu_ThenLogMessagesAdded()
        {
            // Given
            var observerMock = mocks.StrictMock<IObserver>();

            var section = new FailureMechanismSection("A", new[]
            {
                new Point2D(1, 2),
                new Point2D(3, 4)
            });

            var failureMechanism = new ClosingStructuresFailureMechanism();
            failureMechanism.AddSection(section);

            string validFilePath = Path.Combine(testDataPath, "complete.sqlite");

            var hydraulicBoundaryLocation = new HydraulicBoundaryLocation(1, string.Empty, 0.0, 1.1);
            var hydraulicBoundaryDatabase = new HydraulicBoundaryDatabase
            {
                FilePath = validFilePath,
                Version = "random"
            };
            hydraulicBoundaryDatabase.Locations.Add(hydraulicBoundaryLocation);

            var assessmentSectionStub = mocks.Stub<IAssessmentSection>();

            var calculation = new TestClosingStructuresCalculation
            {
                InputParameters =
                {
                    HydraulicBoundaryLocation = hydraulicBoundaryLocation
                }
            };

            var calculationContext = new ClosingStructuresCalculationContext(calculation, failureMechanism, assessmentSectionStub);

            using (var treeViewControl = new TreeViewControl())
            {
                guiMock.Expect(g => g.Get(calculationContext, treeViewControl)).Return(new CustomItemsOnlyContextMenuBuilder());

                mocks.ReplayAll();

                assessmentSectionStub.HydraulicBoundaryDatabase = hydraulicBoundaryDatabase;

                plugin.Gui = guiMock;

                calculation.Attach(observerMock);

                using (ContextMenuStrip contextMenuStrip = info.ContextMenuStrip(calculationContext, null, treeViewControl))
                {
                    // When
                    Action action = () => contextMenuStrip.Items[contextMenuValidateIndex].PerformClick();

                    // Then
                    TestHelper.AssertLogMessages(action, messages =>
                    {
                        var msgs = messages.ToArray();
                        Assert.AreEqual(2, msgs.Length);
                        StringAssert.StartsWith(string.Format("Validatie van '{0}' gestart om: ", calculation.Name), msgs[0]);
                        StringAssert.StartsWith(string.Format("Validatie van '{0}' beëindigd om: ", calculation.Name), msgs[1]);
                    });
                }
            }
        }

        [Test]
        public void OnNodeRemoved_ParentIsCalculationGroupContext_RemoveCalculationFromGroup()
        {
            // Setup
            var group = new CalculationGroup();
            var failureMechanism = new ClosingStructuresFailureMechanism();
            var elementToBeRemoved = new StructuresCalculation<ClosingStructuresInput>();
            var observerMock = mocks.StrictMock<IObserver>();
            var assessmentSectionStub = mocks.Stub<IAssessmentSection>();
            var calculationContext = new ClosingStructuresCalculationContext(elementToBeRemoved,
                                                                             failureMechanism,
                                                                             assessmentSectionStub);
            var groupContext = new ClosingStructuresCalculationGroupContext(group,
                                                                            failureMechanism,
                                                                            assessmentSectionStub);

            observerMock.Expect(o => o.UpdateObserver());

            mocks.ReplayAll();

            group.Children.Add(elementToBeRemoved);
            group.Children.Add(new StructuresCalculation<ClosingStructuresInput>());
            group.Attach(observerMock);

            // Precondition
            Assert.IsTrue(info.CanRemove(calculationContext, groupContext));
            Assert.AreEqual(2, group.Children.Count);

            // Call
            info.OnNodeRemoved(calculationContext, groupContext);

            // Assert
            Assert.AreEqual(1, group.Children.Count);
            CollectionAssert.DoesNotContain(group.Children, elementToBeRemoved);
        }

        [Test]
        public void OnNodeRemoved_CalculationInGroupAssignedToSection_CalculationDetachedFromSection()
        {
            // Setup
            var group = new CalculationGroup();
            var failureMechanism = new ClosingStructuresFailureMechanism();
            var elementToBeRemoved = new StructuresCalculation<ClosingStructuresInput>();
            var assessmentSectionStub = mocks.Stub<IAssessmentSection>();
            var calculationContext = new ClosingStructuresCalculationContext(elementToBeRemoved,
                                                                             failureMechanism,
                                                                             assessmentSectionStub);
            var groupContext = new ClosingStructuresCalculationGroupContext(group,
                                                                            failureMechanism,
                                                                            assessmentSectionStub);

            mocks.ReplayAll();

            group.Children.Add(elementToBeRemoved);

            failureMechanism.AddSection(new FailureMechanismSection("section", new[]
            {
                new Point2D(0, 0)
            }));

            ClosingStructuresFailureMechanismSectionResult result = failureMechanism.SectionResults.First();
            result.Calculation = elementToBeRemoved;

            // Call
            info.OnNodeRemoved(calculationContext, groupContext);

            // Assert
            Assert.IsNull(result.Calculation);
        }

        private class TestClosingStructuresOutput : ProbabilityAssessmentOutput
        {
            public TestClosingStructuresOutput() : base(0, 0, 0, 0, 0) {}
        }
    }
}