// 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 LetKeywordRecommenderTests : KeywordRecommenderTests
{
    [Fact]
    public async Task TestNotAtRoot_Interactive()
    {
        await VerifyAbsenceAsync(SourceCodeKind.Script,
@"$$");
    }
 
    [Fact]
    public async Task TestNotAfterClass_Interactive()
    {
        await VerifyAbsenceAsync(SourceCodeKind.Script,
            """
            class C { }
            $$
            """);
    }
 
    [Fact]
    public async Task TestNotAfterGlobalStatement_Interactive()
    {
        await VerifyAbsenceAsync(SourceCodeKind.Script,
            """
            System.Console.WriteLine();
            $$
            """);
    }
 
    [Fact]
    public async Task TestNotAfterGlobalVariableDeclaration_Interactive()
    {
        await VerifyAbsenceAsync(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 TestNotInEmptyStatement()
    {
        await VerifyAbsenceAsync(AddInsideMethod(
@"$$"));
    }
 
    [Fact]
    public async Task TestNotAtEndOfPreviousClause()
    {
        await VerifyAbsenceAsync(AddInsideMethod(
@"var q = from x in y$$"));
    }
 
    [Fact]
    public async Task TestNewClause()
    {
        await VerifyKeywordAsync(AddInsideMethod(
            """
            var q = from x in y
                      $$
            """));
    }
 
    [Fact]
    public async Task TestAfterPreviousClause()
    {
        await VerifyKeywordAsync(AddInsideMethod(
            """
            var v = from x in y
                      where x > y
                      $$
            """));
    }
 
    [Fact]
    public async Task TestAfterPreviousContinuationClause()
    {
        await VerifyKeywordAsync(AddInsideMethod(
            """
            var v = from x in y
                      group x by y into g
                      $$
            """));
    }
 
    [Fact]
    public async Task TestBetweenClauses()
    {
        await VerifyKeywordAsync(AddInsideMethod(
            """
            var q = from x in y
                      $$
                      from z in w
            """));
    }
 
    [Fact]
    public async Task TestNotAfterLet()
    {
        await VerifyAbsenceAsync(AddInsideMethod(
            """
            var q = from x in y
                      let $$
            """));
    }
}