// 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;
using System.Collections.Generic;
using System.Reflection;
using System.Threading.Tasks;
using Microsoft.CodeAnalysis.CSharp;
using Microsoft.CodeAnalysis.CSharp.Completion.KeywordRecommenders;
using Xunit;
 
namespace Microsoft.CodeAnalysis.Editor.CSharp.UnitTests.Recommendations;
 
public class KeywordRecommenderTests : RecommenderTests
{
    private static readonly Dictionary<SyntaxKind, AbstractSyntacticSingleKeywordRecommender> s_recommenderMap = new(SyntaxFacts.EqualityComparer);
    protected override string KeywordText { get; }
 
    static KeywordRecommenderTests()
    {
        foreach (var recommenderType in typeof(AbstractSyntacticSingleKeywordRecommender).Assembly.GetTypes())
        {
            if (recommenderType.IsSubclassOf(typeof(AbstractSyntacticSingleKeywordRecommender)))
            {
                try
                {
                    var recommender = Activator.CreateInstance(recommenderType);
                    var field = recommenderType.GetField(nameof(AbstractSyntacticSingleKeywordRecommender.KeywordKind), BindingFlags.Public | BindingFlags.Instance);
                    var kind = (SyntaxKind)field!.GetValue(recommender)!;
 
                    s_recommenderMap.Add(kind, (AbstractSyntacticSingleKeywordRecommender)recommender!);
                }
                catch
                {
                }
            }
        }
    }
 
    protected KeywordRecommenderTests()
    {
        var name = GetType().Name;
        var kindName = name[..^"RecommenderTests".Length]; // e.g. ForEachKeywordRecommenderTests -> ForEachKeyword
 
        var field = typeof(SyntaxKind).GetField(kindName);
        var kind = (SyntaxKind)field!.GetValue(null)!;
        KeywordText = SyntaxFacts.GetText(kind);
 
        s_recommenderMap.TryGetValue(kind, out var recommender);
        Assert.NotNull(recommender);
 
        RecommendKeywordsAsync = (position, context) => Task.FromResult(recommender.GetTestAccessor().RecommendKeywords(position, context));
    }
}