// 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.
 
using System.Threading.Tasks;
using Microsoft.CodeAnalysis.Test.Utilities;
using Roslyn.Test.Utilities;
using Xunit;
 
namespace Microsoft.CodeAnalysis.Editor.CSharp.UnitTests.Recommendations;
 
[Trait(Traits.Feature, Traits.Features.KeywordRecommending)]
public sealed class DefaultKeywordRecommenderTests : KeywordRecommenderTests
{
    [Fact]
    public async Task TestAtRoot_Interactive()
    {
        await VerifyKeywordAsync(SourceCodeKind.Script,
@"$$");
    }
 
    [Fact]
    public async Task TestAfterClass_Interactive()
    {
        await VerifyKeywordAsync(SourceCodeKind.Script,
            """
            class C { }
            $$
            """);
    }
 
    [Fact]
    public async Task TestAfterGlobalStatement()
    {
        await VerifyKeywordAsync(
            """
            System.Console.WriteLine();
            $$
            """);
    }
 
    [Fact]
    public async Task TestAfterGlobalVariableDeclaration_Interactive()
    {
        await VerifyKeywordAsync(SourceCodeKind.Script,
            """
            int i = 0;
            $$
            """);
    }
 
    [Fact]
    public async Task TestNotInUsingAlias()
    {
        await VerifyAbsenceAsync(
@"using Goo = $$");
    }
 
    [Fact]
    public async Task TestNotInGlobalUsingAlias()
    {
        await VerifyAbsenceAsync(
@"global using Goo = $$");
    }
 
    [Fact]
    public async Task TestNotInPreprocessor1()
    {
        await VerifyAbsenceAsync(
            """
            class C {
            #$$
            """);
    }
 
    [Fact]
    public async Task TestNotInPreprocessor2()
    {
        await VerifyAbsenceAsync(
            """
            class C {
            #if $$
            """);
    }
 
    [Fact]
    public async Task TestAfterHash()
    {
        await VerifyKeywordAsync(
@"#line $$");
    }
 
    [Fact]
    public async Task TestAfterHashAndSpace()
    {
        await VerifyKeywordAsync(
@"# line $$");
    }
 
    [Fact]
    public async Task TestInEmptyStatement()
    {
        await VerifyKeywordAsync(AddInsideMethod(
@"$$"));
    }
 
    [Fact]
    public async Task TestInExpression()
    {
        await VerifyKeywordAsync(AddInsideMethod(
@"var q = $$"));
    }
 
    [Fact]
    public async Task TestAfterSwitch()
    {
        await VerifyKeywordAsync(AddInsideMethod(
            """
            switch (expr) {
                $$
            """));
    }
 
    [Fact]
    public async Task TestAfterCase()
    {
        await VerifyKeywordAsync(AddInsideMethod(
            """
            switch (expr) {
                case 0:
                $$
            """));
    }
 
    [Fact]
    public async Task TestAfterDefault()
    {
        await VerifyKeywordAsync(AddInsideMethod(
            """
            switch (expr) {
                default:
                $$
            """));
    }
 
    [Fact]
    public async Task TestAfterOneStatement()
    {
        await VerifyKeywordAsync(AddInsideMethod(
            """
            switch (expr) {
                default:
                  Console.WriteLine();
                $$
            """));
    }
 
    [Fact]
    public async Task TestAfterTwoStatements()
    {
        await VerifyKeywordAsync(AddInsideMethod(
            """
            switch (expr) {
                default:
                  Console.WriteLine();
                  Console.WriteLine();
                $$
            """));
    }
 
    [Fact]
    public async Task TestAfterBlock()
    {
        await VerifyKeywordAsync(AddInsideMethod(
            """
            switch (expr) {
                default: {
                }
                $$
            """));
    }
 
    [Fact]
    public async Task TestAfterIfElse()
    {
        await VerifyKeywordAsync(AddInsideMethod(
            """
            switch (expr) {
                default:
                  if (goo) {
                  } else {
                  }
                $$
            """));
    }
 
    [Fact]
    public async Task TestAfterIncompleteStatement()
    {
        await VerifyKeywordAsync(AddInsideMethod(
            """
            switch (expr) {
                default:
                   Console.WriteLine(
                $$
            """));
    }
 
    [Fact]
    public async Task TestInsideBlock()
    {
        await VerifyKeywordAsync(AddInsideMethod(
            """
            switch (expr) {
                default: {
                  $$
            """));
    }
 
    [Fact]
    public async Task TestAfterCompleteIf()
    {
        await VerifyKeywordAsync(AddInsideMethod(
            """
            switch (expr) {
                default:
                  if (goo)
                    Console.WriteLine();
                $$
            """));
    }
 
    [Fact]
    public async Task TestAfterIncompleteIf()
    {
        await VerifyKeywordAsync(AddInsideMethod(
            """
            switch (expr) {
                default:
                  if (goo)
                    $$
            """));
    }
 
    [Fact]
    public async Task TestAfterWhile()
    {
        await VerifyKeywordAsync(AddInsideMethod(
            """
            switch (expr) {
                default:
                  while (true) {
                  }
                $$
            """));
    }
 
    [Fact, WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/552717")]
    public async Task TestNotAfterGotoInSwitch()
    {
        await VerifyAbsenceAsync(AddInsideMethod(
            """
            switch (expr) {
                default:
                  goto $$
            """));
    }
 
    [Fact]
    public async Task TestNotAfterGotoOutsideSwitch()
    {
        await VerifyAbsenceAsync(AddInsideMethod(
@"goto $$"));
    }
 
    [Fact, WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/538804")]
    public async Task TestNotInTypeOf()
    {
        await VerifyAbsenceAsync(AddInsideMethod(
@"typeof($$"));
    }
 
    [Fact, WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/538804")]
    public async Task TestNotInDefault()
    {
        await VerifyAbsenceAsync(AddInsideMethod(
@"default($$"));
    }
 
    [Fact, WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/538804")]
    public async Task TestNotInSizeOf()
    {
        await VerifyAbsenceAsync(AddInsideMethod(
@"sizeof($$"));
    }
 
    [Fact, WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/544219")]
    public async Task TestNotInObjectInitializerMemberContext()
    {
        await VerifyAbsenceAsync("""
            class C
            {
                public int x, y;
                void M()
                {
                    var c = new C { x = 2, y = 3, $$
            """);
    }
 
    [Fact]
    public async Task TestAfterRefExpression()
    {
        await VerifyKeywordAsync(AddInsideMethod(
@"ref int x = ref $$"));
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/46283")]
    public async Task TestInTypeParameterConstraint()
    {
        await VerifyKeywordAsync(
            """
            class C
            {
                void M<T>() where T : $$
                {
                }
            }
            """);
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/46283")]
    public async Task TestInTypeParameterConstraint_InOverride()
    {
        await VerifyKeywordAsync(
            """
            class C : Base
            {
                public override void M<T>() where T : $$
                {
                }
            }
            """);
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/46283")]
    public async Task TestInTypeParameterConstraint_InExplicitInterfaceImplementation()
    {
        await VerifyKeywordAsync(
            """
            class C : I
            {
                public void I.M<T>() where T : $$
                {
                }
            }
            """);
    }
 
    [Fact]
    public async Task TestAfterLambdaOpenParen()
    {
        await VerifyKeywordAsync(
@"var lam = ($$");
    }
 
    [Fact]
    public async Task TestAfterLambdaComma()
    {
        await VerifyKeywordAsync(
@"var lam = (int i, $$");
    }
 
    [Fact]
    public async Task TestLambdaDefaultParameterValue()
    {
        await VerifyKeywordAsync(
@"var lam = (int i = $$");
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/36472")]
    public async Task InAmbiguousCast1()
    {
        await VerifyKeywordAsync(
            """
            class C
            {
                static void Main(string[] args)
                {
                    (int i, string s) tuple;
                    tuple = ($$)
                    Main(args);
                }
            }
            """);
    }
}