// 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 Xunit;
 
namespace Microsoft.CodeAnalysis.Editor.CSharp.UnitTests.Recommendations;
 
[Trait(Traits.Feature, Traits.Features.KeywordRecommending)]
public sealed class ForEachKeywordRecommenderTests : KeywordRecommenderTests
{
    [Fact]
    public async Task TestAtRoot_Interactive()
    {
        await VerifyKeywordAsync(SourceCodeKind.Script,
@"$$");
    }
 
    [Fact]
    public async Task TestAtRoot_TopLevelStatement()
    {
        await VerifyKeywordAsync(
@"$$", options: CSharp9ParseOptions);
    }
 
    [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 TestAfterStatement_TopLevelStatement()
    {
        await VerifyKeywordAsync(
            """
            System.Console.WriteLine();
            $$
            """, options: CSharp9ParseOptions);
    }
 
    [Fact]
    public async Task TestAfterGlobalVariableDeclaration_Interactive()
    {
        await VerifyKeywordAsync(SourceCodeKind.Script,
            """
            int i = 0;
            $$
            """);
    }
 
    [Fact]
    public async Task TestAfterVariableDeclaration_TopLevelStatement()
    {
        await VerifyKeywordAsync(
            """
            int i = 0;
            $$
            """, options: CSharp9ParseOptions);
    }
 
    [Fact]
    public async Task TestNotInUsingAlias()
    {
        await VerifyAbsenceAsync(
@"using Goo = $$");
    }
 
    [Fact]
    public async Task TestNotInGlobalUsingAlias()
    {
        await VerifyAbsenceAsync(
@"global using Goo = $$");
    }
 
    [Theory, CombinatorialData]
    public async Task TestEmptyStatement(bool topLevelStatement)
    {
        await VerifyKeywordAsync(AddInsideMethod(
@"$$", topLevelStatement: topLevelStatement), options: CSharp9ParseOptions);
    }
 
    [Theory, CombinatorialData]
    public async Task TestAfterAwait(bool topLevelStatement)
    {
        await VerifyKeywordAsync(AddInsideMethod(
@"await $$", isAsync: true, topLevelStatement: topLevelStatement), options: CSharp9ParseOptions);
    }
 
    [Theory, CombinatorialData]
    public async Task TestBeforeStatement(bool topLevelStatement)
    {
        await VerifyKeywordAsync(AddInsideMethod(
            """
            $$
            return 0;
            """, returnType: "int", topLevelStatement: topLevelStatement), options: CSharp9ParseOptions);
    }
 
    [Theory, CombinatorialData]
    public async Task TestAfterStatement(bool topLevelStatement)
    {
        await VerifyKeywordAsync(AddInsideMethod(
            """
            return true;
            $$
            """, topLevelStatement: topLevelStatement), options: CSharp9ParseOptions);
    }
 
    [Theory, CombinatorialData]
    public async Task TestAfterBlock(bool topLevelStatement)
    {
        await VerifyKeywordAsync(AddInsideMethod(
            """
            if (true) {
            }
            $$
            """, topLevelStatement: topLevelStatement), options: CSharp9ParseOptions);
    }
 
    [Theory, CombinatorialData]
    public async Task TestInsideForEach(bool topLevelStatement)
    {
        await VerifyKeywordAsync(AddInsideMethod(
            """
            foreach (var v in c)
                 $$
            """, topLevelStatement: topLevelStatement), options: CSharp9ParseOptions);
    }
 
    [Theory, CombinatorialData]
    public async Task TestInsideForEachInsideForEach(bool topLevelStatement)
    {
        await VerifyKeywordAsync(AddInsideMethod(
            """
            foreach (var v in c)
                 foreach (var v in c)
                    $$
            """, topLevelStatement: topLevelStatement), options: CSharp9ParseOptions);
    }
 
    [Theory, CombinatorialData]
    public async Task TestInsideForEachBlock(bool topLevelStatement)
    {
        await VerifyKeywordAsync(AddInsideMethod(
            """
            foreach (var v in c) {
                 $$
            """, topLevelStatement: topLevelStatement), options: CSharp9ParseOptions);
    }
 
    [Theory, CombinatorialData]
    public async Task TestNotAfterForEach1(bool topLevelStatement)
    {
        await VerifyAbsenceAsync(AddInsideMethod(
@"foreach $$", topLevelStatement: topLevelStatement), options: CSharp9ParseOptions);
    }
 
    [Theory, CombinatorialData]
    public async Task TestNotAfterForEach2(bool topLevelStatement)
    {
        await VerifyAbsenceAsync(AddInsideMethod(
@"foreach ($$", topLevelStatement: topLevelStatement), options: CSharp9ParseOptions);
    }
 
    [Theory, CombinatorialData]
    public async Task TestNotAfterForEach3(bool topLevelStatement)
    {
        await VerifyAbsenceAsync(AddInsideMethod(
@"foreach (var $$", topLevelStatement: topLevelStatement), options: CSharp9ParseOptions);
    }
 
    [Theory, CombinatorialData]
    public async Task TestNotAfterForEach4(bool topLevelStatement)
    {
        await VerifyAbsenceAsync(AddInsideMethod(
@"foreach (var v $$", topLevelStatement: topLevelStatement), options: CSharp9ParseOptions);
    }
 
    [Theory, CombinatorialData]
    public async Task TestNotAfterForEach5(bool topLevelStatement)
    {
        await VerifyAbsenceAsync(AddInsideMethod(
@"foreach (var v in $$", topLevelStatement: topLevelStatement), options: CSharp9ParseOptions);
    }
 
    [Theory, CombinatorialData]
    public async Task TestNotAfterForEach6(bool topLevelStatement)
    {
        await VerifyAbsenceAsync(AddInsideMethod(
@"foreach (var v in c $$", topLevelStatement: topLevelStatement), options: CSharp9ParseOptions);
    }
 
    [Fact]
    public async Task TestNotInClass()
    {
        await VerifyAbsenceAsync("""
            class C
            {
              $$
            }
            """);
    }
}