// 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 ElseKeywordRecommenderTests : 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 TestNotInPreprocessor1()
    {
        await VerifyAbsenceAsync(
            """
            class C {
            #if $$
            """);
    }
 
    [Fact]
    public async Task TestInPreprocessorFollowedBySkippedTokens()
    {
        await VerifyKeywordAsync(
            """
            #if GOO
            #$$
            dasd
            """);
    }
 
    [Fact]
    public async Task TestNotInEmptyStatement()
    {
        await VerifyAbsenceAsync(AddInsideMethod(
@"$$"));
    }
 
    [Fact]
    public async Task TestAfterHash()
    {
        await VerifyKeywordAsync(
@"#$$");
    }
 
    [Fact]
    public async Task TestAfterHashAndSpace()
    {
        await VerifyKeywordAsync(
@"# $$");
    }
 
    [Fact]
    public async Task TestNotAfterIf()
    {
        await VerifyAbsenceAsync(AddInsideMethod(
            """
            if (true)
            $$
            """));
    }
 
    [Theory]
    [InlineData("Console.WriteLine();")]
    [InlineData("{ }")]
    [InlineData("while (true) { }")]
    public async Task TestAfterIfStatement(string statement)
    {
        await VerifyKeywordAsync(AddInsideMethod(
$@"if (true)
    {statement}
$$"));
    }
 
    [Theory]
    [InlineData("Console.WriteLine();")]
    [InlineData("{ }")]
    [InlineData("while (true) { }")]
    public async Task TestAfterIfStatement_BeforeElse(string statement)
    {
        await VerifyKeywordAsync(AddInsideMethod(
$@"if (true)
    {statement}
$$
else"));
    }
 
    [Theory]
    [InlineData("Console.WriteLine();")]
    [InlineData("{ }")]
    [InlineData("while (true) { }")]
    public async Task TestAfterIfNestedIfStatement(string statement)
    {
        await VerifyKeywordAsync(AddInsideMethod(
$@"if (true)
    if (true)
        {statement}
    $$"));
    }
 
    [Theory]
    [InlineData("Console.WriteLine();")]
    [InlineData("{ }")]
    [InlineData("while (true) { }")]
    public async Task TestAfterIfNestedIfStatement_BeforeElse(string statement)
    {
        await VerifyKeywordAsync(AddInsideMethod(
$@"if (true)
    if (true)
        {statement}
    $$
    else"));
    }
 
    [Theory, WorkItem("https://github.com/dotnet/roslyn/issues/25336")]
    [InlineData("Console.WriteLine();")]
    [InlineData("{ }")]
    [InlineData("while (true) { }")]
    public async Task TestAfterIfNestedIfElseStatement(string statement)
    {
        await VerifyKeywordAsync(AddInsideMethod(
$@"if (true)
    if (true)
        Console.WriteLine();
    else
        {statement}
$$"));
    }
 
    [Theory, WorkItem("https://github.com/dotnet/roslyn/issues/25336")]
    [InlineData("Console.WriteLine();")]
    [InlineData("{ }")]
    [InlineData("while (true) { }")]
    public async Task TestAfterIfNestedIfElseStatement_BeforeElse(string statement)
    {
        await VerifyKeywordAsync(AddInsideMethod(
$@"if (true)
    if (true)
        Console.WriteLine();
    else
        {statement}
$$
else"));
    }
 
    [Theory]
    [InlineData("Console.WriteLine();")]
    [InlineData("{ }")]
    [InlineData("while (true) { }")]
    public async Task TestNotAfterIfNestedIfElseElseStatement(string statement)
    {
        await VerifyAbsenceAsync(AddInsideMethod(
$@"if (true)
    if (true)
        Console.WriteLine();
    else
        Console.WriteLine();
else
    {statement}
$$"));
    }
 
    [Theory]
    [InlineData("Console.WriteLine();")]
    [InlineData("{ }")]
    [InlineData("while (true) { }")]
    public async Task TestNotAfterIfStatementElse(string statement)
    {
        await VerifyAbsenceAsync(AddInsideMethod(
$@"if (true)
    {statement}
else
    $$"));
    }
 
    [Theory]
    [InlineData("Console.WriteLine();")]
    [InlineData("{ }")]
    [InlineData("while (true) { }")]
    public async Task TestNotAfterIfElseStatement(string statement)
    {
        await VerifyAbsenceAsync(AddInsideMethod(
$@"if (true)
    Console.WriteLine();
else
    {statement}
$$"));
    }
 
    [Theory]
    [InlineData("Console.WriteLine();")]
    [InlineData("{ }")]
    [InlineData("while (true) { }")]
    public async Task TestAfterIfElseNestedIfStatement(string statement)
    {
        await VerifyKeywordAsync(AddInsideMethod(
$@"if (true)
    Console.WriteLine();
else
    if (true)
        {statement}
    $$"));
    }
 
    [Theory]
    [InlineData("Console.WriteLine();")]
    [InlineData("{ }")]
    [InlineData("while (true) { }")]
    public async Task TestAfterIfElseNestedIfStatement_BeforeElse(string statement)
    {
        await VerifyKeywordAsync(AddInsideMethod(
$@"if (true)
    Console.WriteLine();
else
    if (true)
        {statement}
    $$
    else"));
    }
 
    [Theory]
    [InlineData("Console.WriteLine();")]
    [InlineData("{ }")]
    [InlineData("while (true) { }")]
    public async Task TestNotAfterIfElseNestedIfElseStatement(string statement)
    {
        await VerifyAbsenceAsync(AddInsideMethod(
$@"if (true)
    Console.WriteLine();
else
    if (true)
        Console.WriteLine();
    else
        {statement}
$$"));
    }
 
    [Theory]
    [InlineData("Console.WriteLine();")]
    [InlineData("{ }")]
    [InlineData("while (true) { }")]
    public async Task TestAfterWhileIfWhileNestedIfElseStatement(string statement)
    {
        await VerifyKeywordAsync(AddInsideMethod(
$@"while (true)
    if (true)
        while (true)
            if (true)
                Console.WriteLine();
            else
                {statement}
    $$"));
    }
 
    [Theory]
    [InlineData("Console.WriteLine();")]
    [InlineData("{ }")]
    [InlineData("while (true) { }")]
    public async Task TestAfterWhileIfWhileNestedIfElseStatement_BeforeElse(string statement)
    {
        await VerifyKeywordAsync(AddInsideMethod(
$@"while (true)
    if (true)
        while (true)
            if (true)
                Console.WriteLine();
            else
                {statement}
    $$
    else"));
    }
 
    [Theory]
    [InlineData("Console.WriteLine();")]
    [InlineData("{ }")]
    [InlineData("while (true) { }")]
    public async Task TestNotAfterWhileIfWhileNestedIfElseElseStatement(string statement)
    {
        await VerifyAbsenceAsync(AddInsideMethod(
$@"while (true)
    if (true)
        while (true)
            if (true)
                Console.WriteLine();
            else
                Console.WriteLine();
    else
        {statement}
$$"));
    }
 
    [Theory]
    [InlineData("Console")]
    [InlineData("Console.")]
    [InlineData("Console.WriteLine(")]
    [InlineData("Console.WriteLine()")]
    [InlineData("{")]
    [InlineData("{ Console.WriteLine();")]
    [InlineData("while")]
    [InlineData("while (true)")]
    [InlineData("while (true) {")]
    [InlineData("while (true) { { }")]
    [InlineData("for (int i = 0;")]
    public async Task TestNotAfterIfIncompleteStatement(string statement)
    {
        await VerifyAbsenceAsync(AddInsideMethod(
$@"if (true)
    {statement}
$$"));
    }
 
    [Theory]
    [InlineData("Console")]
    [InlineData("Console.")]
    [InlineData("Console.WriteLine(")]
    [InlineData("Console.WriteLine()")]
    [InlineData("{")]
    [InlineData("{ Console.WriteLine();")]
    [InlineData("while")]
    [InlineData("while (true)")]
    [InlineData("while (true) {")]
    [InlineData("while (true) { { }")]
    [InlineData("for (int i = 0;")]
    public async Task TestNotAfterIfNestedIfIncompleteStatement(string statement)
    {
        await VerifyAbsenceAsync(AddInsideMethod(
$@"if (true)
    if (true)
        {statement}
    $$"));
    }
 
    [Theory]
    [InlineData("Console")]
    [InlineData("Console.")]
    [InlineData("Console.WriteLine(")]
    [InlineData("Console.WriteLine()")]
    [InlineData("{")]
    [InlineData("{ Console.WriteLine();")]
    [InlineData("while")]
    [InlineData("while (true)")]
    [InlineData("while (true) {")]
    [InlineData("while (true) { { }")]
    [InlineData("for (int i = 0;")]
    public async Task TestNotAfterIfNestedIfElseIncompleteStatement(string statement)
    {
        await VerifyAbsenceAsync(AddInsideMethod(
$@"if (true)
    if (true)
        Console.WriteLine();
    else
        {statement}
$$"));
    }
 
    [Theory]
    [InlineData("Console.WriteLine();")]
    [InlineData("{ }")]
    [InlineData("while (true) { }")]
    public async Task TestAfterIfNestedIfIncompleteStatementElseStatement(string statement)
    {
        await VerifyKeywordAsync(AddInsideMethod(
$@"if (true)
    if (true)
        Console // Incomplete, but that's fine. This is not the if statement we care about.
    else
        {statement}
$$"));
    }
 
    [Theory]
    [InlineData("Console.WriteLine();")]
    [InlineData("{ }")]
    [InlineData("while (true) { }")]
    public async Task TestAfterIfNestedIfIncompleteStatementElseStatement_BeforeElse(string statement)
    {
        await VerifyKeywordAsync(AddInsideMethod(
$@"if (true)
    if (true)
        Console // Incomplete, but that's fine. This is not the if statement we care about.
    else
        {statement}
$$
else"));
    }
 
    [Fact]
    public async Task TestNotInsideStatement()
    {
        await VerifyAbsenceAsync(AddInsideMethod(
            """
            if (true)
                Console.WriteLine()$$; // Complete statement, but we're not at the end of it.
            """));
    }
 
    [Fact]
    public async Task TestNotAfterSkippedToken()
    {
        await VerifyAbsenceAsync(AddInsideMethod(
            """
            if (true)
                Console.WriteLine();,
            $$
            """));
    }
}