' Licensed to the .NET Foundation under one or more agreements.
' The .NET Foundation licenses this file to you under the MIT license.
' See the LICENSE file in the project root for more information.
 
Imports System.Threading
Imports Microsoft.CodeAnalysis
Imports Microsoft.CodeAnalysis.AddImport
Imports Microsoft.CodeAnalysis.Editor.UnitTests.Extensions
Imports Microsoft.CodeAnalysis.Options
Imports Microsoft.CodeAnalysis.Test.Utilities
Imports Microsoft.CodeAnalysis.Text
Imports Microsoft.CodeAnalysis.VisualBasic.Formatting
Imports Microsoft.VisualStudio.LanguageServices.Implementation.Snippets
Imports Microsoft.VisualStudio.Text.Editor
Imports Microsoft.VisualStudio.Text.Projection
Imports Roslyn.Test.Utilities
 
Namespace Microsoft.VisualStudio.LanguageServices.UnitTests.Snippets
    <[UseExportProvider]>
    <Trait(Traits.Feature, Traits.Features.Snippets)>
    Public Class VisualBasicSnippetExpansionClientTests
        <WpfFact>
        Public Async Function TestAddImport_EmptyDocument() As Task
            Dim originalCode = <![CDATA[]]>.Value
            Dim namespacesToAdd = {"System"}
            Dim expectedUpdatedCode = <![CDATA[Imports System

]]>.Value
            Await TestSnippetAddImportsAsync(originalCode, namespacesToAdd, placeSystemNamespaceFirst:=True, expectedUpdatedCode:=expectedUpdatedCode)
        End Function
 
        <WpfFact>
        Public Async Function TestAddImport_EmptyDocument_SystemAtTop() As Task
            Dim originalCode = <![CDATA[]]>.Value
            Dim namespacesToAdd = {"First.Alphabetically", "System.Bar"}
            Dim expectedUpdatedCode = <![CDATA[Imports System.Bar
Imports First.Alphabetically

]]>.Value
            Await TestSnippetAddImportsAsync(originalCode, namespacesToAdd, placeSystemNamespaceFirst:=True, expectedUpdatedCode:=expectedUpdatedCode)
        End Function
 
        <WpfFact>
        Public Async Function TestAddImport_EmptyDocument_SystemNotSortedToTop() As Task
            Dim originalCode = <![CDATA[]]>.Value
            Dim namespacesToAdd = {"First.Alphabetically", "System.Bar"}
            Dim expectedUpdatedCode = <![CDATA[Imports First.Alphabetically
Imports System.Bar

]]>.Value
            Await TestSnippetAddImportsAsync(originalCode, namespacesToAdd, placeSystemNamespaceFirst:=False, expectedUpdatedCode:=expectedUpdatedCode)
        End Function
 
        <WpfFact>
        Public Async Function TestAddImport_AddsOnlyNewNamespaces() As Task
            Dim originalCode = <![CDATA[Imports A.B.C
Imports D.E.F
]]>.Value
            Dim namespacesToAdd = {"D.E.F", "G.H.I"}
            Dim expectedUpdatedCode = <![CDATA[Imports A.B.C
Imports D.E.F
Imports G.H.I
]]>.Value
            Await TestSnippetAddImportsAsync(originalCode, namespacesToAdd, placeSystemNamespaceFirst:=True, expectedUpdatedCode:=expectedUpdatedCode)
        End Function
 
        <WpfFact(Skip:="Issue #321")>
        Public Async Function TestAddImport_AddsOnlyNewAliasAndNamespacePairs() As Task
            Dim originalCode = <![CDATA[Imports A = B.C
Imports D = E.F
Imports G = H.I
]]>.Value
            Dim namespacesToAdd = {"A = E.F", "D = B.C", "G = H.I", "J = K.L"}
            Dim expectedUpdatedCode = <![CDATA[Imports A = B.C
Imports A = E.F
Imports D = B.C
Imports D = E.F
Imports G = H.I
Imports J = K.L
]]>.Value
            Await TestSnippetAddImportsAsync(originalCode, namespacesToAdd, placeSystemNamespaceFirst:=True, expectedUpdatedCode:=expectedUpdatedCode)
        End Function
 
        <WpfFact>
        Public Async Function TestAddImport_DuplicateNamespaceDetectionIgnoresCase() As Task
            Dim originalCode = <![CDATA[Imports A.b.C
]]>.Value
            Dim namespacesToAdd = {"a.B.C", "A.B.c"}
            Dim expectedUpdatedCode = <![CDATA[Imports A.b.C
]]>.Value
            Await TestSnippetAddImportsAsync(originalCode, namespacesToAdd, placeSystemNamespaceFirst:=True, expectedUpdatedCode:=expectedUpdatedCode)
        End Function
 
        <WpfFact>
        Public Async Function TestAddImport_DuplicateAliasNamespacePairDetectionIgnoresWhitespace1() As Task
            Dim originalCode = <![CDATA[Imports A = B.C
]]>.Value
            Dim namespacesToAdd = {"A  =        B.C"}
            Dim expectedUpdatedCode = <![CDATA[Imports A = B.C
]]>.Value
            Await TestSnippetAddImportsAsync(originalCode, namespacesToAdd, placeSystemNamespaceFirst:=True, expectedUpdatedCode:=expectedUpdatedCode)
        End Function
 
        <WpfFact>
        Public Async Function TestAddImport_DuplicateAliasNamespacePairDetectionIgnoresWhitespace2() As Task
            Dim originalCode = <![CDATA[Imports A     =  B.C
]]>.Value
            Dim namespacesToAdd = {"A=B.C"}
            Dim expectedUpdatedCode = <![CDATA[Imports A     =  B.C
]]>.Value
            Await TestSnippetAddImportsAsync(originalCode, namespacesToAdd, placeSystemNamespaceFirst:=True, expectedUpdatedCode:=expectedUpdatedCode)
        End Function
 
        <WpfFact>
        Public Async Function TestAddImport_DuplicateAliasNamespacePairDetectionIgnoresCase() As Task
            Dim originalCode = <![CDATA[Imports A = B.C
]]>.Value
            Dim namespacesToAdd = {"a = b.C"}
            Dim expectedUpdatedCode = <![CDATA[Imports A = B.C
]]>.Value
            Await TestSnippetAddImportsAsync(originalCode, namespacesToAdd, placeSystemNamespaceFirst:=True, expectedUpdatedCode:=expectedUpdatedCode)
        End Function
 
        <WpfFact>
        Public Async Function TestAddImport_OnlyFormatNewImports() As Task
            Dim originalCode = <![CDATA[Imports A     =  B.C
Imports G=   H.I
]]>.Value
            Dim namespacesToAdd = {"D        =E.F"}
            Dim expectedUpdatedCode = <![CDATA[Imports A     =  B.C
Imports D = E.F
Imports G=   H.I
]]>.Value
            Await TestSnippetAddImportsAsync(originalCode, namespacesToAdd, placeSystemNamespaceFirst:=True, expectedUpdatedCode:=expectedUpdatedCode)
        End Function
 
        <WpfFact>
        Public Async Function TestAddImport_XmlNamespaceImport() As Task
            Dim originalCode = <![CDATA[]]>.Value
            Dim namespacesToAdd = {"<xmlns:db=""http://example.org/database-two"">"}
            Dim expectedUpdatedCode = <![CDATA[Imports <xmlns:db="http://example.org/database-two">

]]>.Value
            Await TestSnippetAddImportsAsync(originalCode, namespacesToAdd, placeSystemNamespaceFirst:=True, expectedUpdatedCode:=expectedUpdatedCode)
        End Function
 
        <WpfFact>
        Public Async Function TestAddImport_DuplicateXmlNamespaceDetectionIgnoresWhitespace1() As Task
            Dim originalCode = <![CDATA[Imports <xmlns:db    = "http://example.org/database-two">
]]>.Value
            Dim namespacesToAdd = {"<xmlns:db=""http://example.org/database-two"">"}
            Dim expectedUpdatedCode = <![CDATA[Imports <xmlns:db    = "http://example.org/database-two">
]]>.Value
            Await TestSnippetAddImportsAsync(originalCode, namespacesToAdd, placeSystemNamespaceFirst:=True, expectedUpdatedCode:=expectedUpdatedCode)
        End Function
 
        <WpfFact>
        Public Async Function TestAddImport_DuplicateXmlNamespaceDetectionIgnoresWhitespace2() As Task
            Dim originalCode = <![CDATA[Imports <xmlns:db="http://example.org/database-two">
]]>.Value
            Dim namespacesToAdd = {"<xmlns:db   =          ""http://example.org/database-two"">"}
            Dim expectedUpdatedCode = <![CDATA[Imports <xmlns:db="http://example.org/database-two">
]]>.Value
            Await TestSnippetAddImportsAsync(originalCode, namespacesToAdd, placeSystemNamespaceFirst:=True, expectedUpdatedCode:=expectedUpdatedCode)
        End Function
 
        <WpfFact>
        Public Async Function TestAddImport_DuplicateXmlNamespaceDetectionIgnoresCase() As Task
            Dim originalCode = <![CDATA[Imports <xmlns:db="http://example.org/database-two">
]]>.Value
            Dim namespacesToAdd = {"<xmlns:Db=""http://example.org/database-two"">", "<xmlns:db=""http://example.org/Database-Two"">"}
            Dim expectedUpdatedCode = <![CDATA[Imports <xmlns:db="http://example.org/database-two">
]]>.Value
            Await TestSnippetAddImportsAsync(originalCode, namespacesToAdd, placeSystemNamespaceFirst:=True, expectedUpdatedCode:=expectedUpdatedCode)
        End Function
 
        <WpfFact, WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/640961")>
        Public Async Function TestAddImport_BadNamespaceGetsAdded() As Task
            Dim originalCode = <![CDATA[]]>.Value
            Dim namespacesToAdd = {"$system"}
            Dim expectedUpdatedCode = <![CDATA[Imports $system

]]>.Value
            Await TestSnippetAddImportsAsync(originalCode, namespacesToAdd, placeSystemNamespaceFirst:=True, expectedUpdatedCode:=expectedUpdatedCode)
        End Function
 
        <WpfFact, WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/640961")>
        Public Async Function TestAddImport_TrailingTriviaIsIncluded() As Task
            Dim originalCode = <![CDATA[]]>.Value
            Dim namespacesToAdd = {"System.Data ' Trivia!"}
            Dim expectedUpdatedCode = <![CDATA[Imports System.Data ' Trivia!

]]>.Value
            Await TestSnippetAddImportsAsync(originalCode, namespacesToAdd, placeSystemNamespaceFirst:=True, expectedUpdatedCode:=expectedUpdatedCode)
        End Function
 
        <WpfFact, WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/640961")>
        Public Async Function TestAddImport_TrailingTriviaNotUsedInDuplicationDetection() As Task
            Dim originalCode = <![CDATA[Imports System.Data ' Original trivia!
]]>.Value
            Dim namespacesToAdd = {"System.Data ' Different trivia, should not be added!", "System ' Different namespace, should be added"}
            Dim expectedUpdatedCode = <![CDATA[Imports System ' Different namespace, should be added
Imports System.Data ' Original trivia!
]]>.Value
            Await TestSnippetAddImportsAsync(originalCode, namespacesToAdd, placeSystemNamespaceFirst:=True, expectedUpdatedCode:=expectedUpdatedCode)
        End Function
 
        <WpfFact>
        Public Sub TestSnippetFormatting_ProjectionBuffer_FullyInSubjectBuffer()
            Dim workspaceXmlWithSubjectBufferDocument =
<Workspace>
    <Project Language=<%= LanguageNames.VisualBasic %> CommonReferences="true">
        <Document>Class C
    Sub M()
        @{|S1:For index = 1 to length
        $$
Next|}
    End Sub
End Class</Document>
    </Project>
</Workspace>
 
            Dim surfaceBufferDocument = <Document>&lt;div&gt;
    @[|{|S1:|} |]
&lt;/div&gt;</Document>
 
            Dim expectedSurfaceBuffer = <SurfaceBuffer>&lt;div&gt;
    @For index = 1 to length
 
Next 
&lt;/div&gt;</SurfaceBuffer>
 
            TestFormatting(workspaceXmlWithSubjectBufferDocument, surfaceBufferDocument, expectedSurfaceBuffer)
        End Sub
 
        <WpfFact>
        Public Sub TestSnippetFormatting_ProjectionBuffer_FullyInSubjectBuffer2()
            Dim workspaceXmlWithSubjectBufferDocument =
<Workspace>
    <Project Language=<%= LanguageNames.VisualBasic %> CommonReferences="true">
        <Document>Class C
    Sub M()
        @{|S1:For index = 1 to length
For index2 = 1 to length
        $$
Next
Next|}
    End Sub
End Class</Document>
    </Project>
</Workspace>
 
            Dim surfaceBufferDocument = <Document>&lt;div&gt;
    @[|{|S1:|} |]
&lt;/div&gt;</Document>
 
            Dim expectedSurfaceBuffer = <SurfaceBuffer>&lt;div&gt;
    @For index = 1 to length
For index2 = 1 to length
 
        Next
        Next 
&lt;/div&gt;</SurfaceBuffer>
 
            TestFormatting(workspaceXmlWithSubjectBufferDocument, surfaceBufferDocument, expectedSurfaceBuffer)
        End Sub
 
        <WpfFact>
        Public Sub TestSnippetFormatting_ProjectionBuffer_ExpandedIntoSurfaceBuffer()
            Dim workspaceXmlWithSubjectBufferDocument =
<Workspace>
    <Project Language=<%= LanguageNames.VisualBasic %> CommonReferences="true">
        <Document>Class C
    Sub M()
        @{|S1:For|}
    End Sub
End Class</Document>
    </Project>
</Workspace>
 
            Dim surfaceBufferDocument = <Document>&lt;div&gt;
    @[|{|S1:|} index = 1 to length
        $$
Next|]
&lt;/div&gt;</Document>
 
            Dim expectedSurfaceBuffer = <SurfaceBuffer>&lt;div&gt;
    @For index = 1 to length
        
Next
&lt;/div&gt;</SurfaceBuffer>
 
            TestFormatting(workspaceXmlWithSubjectBufferDocument, surfaceBufferDocument, expectedSurfaceBuffer)
        End Sub
 
        <WpfFact>
        Public Sub TestSnippetFormatting_ProjectionBuffer_FullyInSurfaceBuffer()
            Dim workspaceXmlWithSubjectBufferDocument =
<Workspace>
    <Project Language=<%= LanguageNames.VisualBasic %> CommonReferences="true">
        <Document>Class C
    Sub M()
        @{|S1:|}
    End Sub
End Class</Document>
    </Project>
</Workspace>
 
            Dim surfaceBufferDocument = <Document>&lt;div&gt;
    @[|{|S1:|}For index = 1 to length
        $$
Next|]
&lt;/div&gt;</Document>
 
            Dim expectedSurfaceBuffer = <SurfaceBuffer>&lt;div&gt;
    @For index = 1 to length
        
Next
&lt;/div&gt;</SurfaceBuffer>
 
            TestFormatting(workspaceXmlWithSubjectBufferDocument, surfaceBufferDocument, expectedSurfaceBuffer)
        End Sub
 
        <WpfTheory, WorkItem("https://github.com/dotnet/roslyn/issues/4652")>
        <InlineData(3)>
        <InlineData(4)>
        <InlineData(5)>
        Public Sub TestFormattingWithTabSize(tabSize As Integer)
            Dim workspaceXml =
<Workspace>
    <Project Language=<%= LanguageNames.VisualBasic %> CommonReferences="true">
        <Document>Class C
	Sub M()
		[|For index = 1 To 10
    $$
Next|]
	End Sub
End Class</Document>
    </Project>
</Workspace>
 
            Dim expectedResult = <Test>Class C
	Sub M()
		For index = 1 To 10
 
		Next
	End Sub
End Class</Test>
 
            Using workspace = EditorTestWorkspace.Create(workspaceXml, openDocuments:=False, composition:=VisualStudioTestCompositions.LanguageServices)
                Dim document = workspace.Documents.Single()
                Dim optionsService = workspace.GetService(Of EditorOptionsService)()
                Dim textBuffer = document.GetTextBuffer()
                Dim editorOptions = optionsService.Factory.GetOptions(textBuffer)
 
                editorOptions.SetOptionValue(DefaultOptions.ConvertTabsToSpacesOptionId, False)
                editorOptions.SetOptionValue(DefaultOptions.TabSizeOptionId, tabSize)
                editorOptions.SetOptionValue(DefaultOptions.IndentSizeOptionId, tabSize)
 
                Dim expansionClientFactory = workspace.Services.GetRequiredService(Of ISnippetExpansionClientFactory)()
                Dim snippetExpansionClient = expansionClientFactory.GetOrCreateSnippetExpansionClient(textBuffer.AsTextContainer().GetOpenDocumentInCurrentContext(), document.GetTextView(), textBuffer)
 
                SnippetExpansionClientTestsHelper.TestFormattingAndCaretPosition(snippetExpansionClient, document, expectedResult, tabSize * 3)
            End Using
        End Sub
 
        Private Shared Async Function TestSnippetAddImportsAsync(
                markupCode As String,
                namespacesToAdd As String(),
                placeSystemNamespaceFirst As Boolean,
                expectedUpdatedCode As String) As Tasks.Task
 
            Dim originalCode As String = Nothing
            Dim position As Integer?
            MarkupTestFile.GetPosition(markupCode, originalCode, position)
 
            Dim workspaceXml = <Workspace>
                                   <Project Language=<%= LanguageNames.VisualBasic %> CommonReferences="true">
                                       <CompilationOptions/>
                                       <Document><%= originalCode %></Document>
                                   </Project>
                               </Workspace>
 
            Dim snippetNode = <Snippet>
                                  <Imports>
                                  </Imports>
                              </Snippet>
 
            For Each namespaceToAdd In namespacesToAdd
                snippetNode.Element("Imports").Add(<Import>
                                                       <Namespace><%= namespaceToAdd %></Namespace>
                                                   </Import>)
            Next
 
            Using workspace = EditorTestWorkspace.Create(workspaceXml, composition:=VisualStudioTestCompositions.LanguageServices)
                Dim expansionClientFactory = workspace.Services.GetRequiredService(Of ISnippetExpansionClientFactory)()
                Dim expansionClient = expansionClientFactory.GetOrCreateSnippetExpansionClient(
                    workspace.Documents.Single().GetTextBuffer().AsTextContainer().GetOpenDocumentInCurrentContext(),
                    workspace.Documents.Single().GetTextView(),
                    workspace.Documents.Single().GetTextBuffer())
 
                Dim document = workspace.CurrentSolution.Projects.Single().Documents.Single()
 
                Dim addImportOptions = New AddImportPlacementOptions() With
                {
                    .PlaceSystemNamespaceFirst = placeSystemNamespaceFirst
                }
 
                Dim formattingOptions = VisualBasicSyntaxFormattingOptions.Default
 
                Dim updatedDocument = expansionClient.GetTestAccessor().LanguageHelper.AddImports(
                    document,
                    addImportOptions,
                    formattingOptions,
                    If(position, 0),
                    snippetNode,
                    CancellationToken.None)
 
                AssertEx.EqualOrDiff(expectedUpdatedCode.Replace(vbLf, vbCrLf),
                             (Await updatedDocument.GetTextAsync()).ToString())
            End Using
        End Function
 
        Public Sub TestFormatting(workspaceXmlWithSubjectBufferDocument As XElement, surfaceBufferDocumentXml As XElement, expectedSurfaceBuffer As XElement)
            Using workspace = EditorTestWorkspace.Create(workspaceXmlWithSubjectBufferDocument, composition:=VisualStudioTestCompositions.LanguageServices)
                Dim subjectBufferDocument = workspace.Documents.Single()
 
                Dim surfaceBufferDocument = workspace.CreateProjectionBufferDocument(
                    surfaceBufferDocumentXml.NormalizedValue,
                    {subjectBufferDocument},
                    options:=ProjectionBufferOptions.WritableLiteralSpans)
 
                Dim expansionClientFactory = workspace.Services.GetRequiredService(Of ISnippetExpansionClientFactory)()
                Dim snippetExpansionClient = expansionClientFactory.GetOrCreateSnippetExpansionClient(
                    subjectBufferDocument.GetTextBuffer().AsTextContainer().GetOpenDocumentInCurrentContext(),
                    surfaceBufferDocument.GetTextView(),
                    subjectBufferDocument.GetTextBuffer())
 
                SnippetExpansionClientTestsHelper.TestProjectionBuffer(snippetExpansionClient, surfaceBufferDocument, expectedSurfaceBuffer)
            End Using
        End Sub
    End Class
End Namespace