// 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.Collections.Immutable;
using System.Diagnostics.CodeAnalysis;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.CodeAnalysis.CodeActions;
using Microsoft.CodeAnalysis.CodeGeneration;
using Microsoft.CodeAnalysis.Internal.Log;
using Microsoft.CodeAnalysis.PooledObjects;
using Microsoft.CodeAnalysis.Text;
 
namespace Microsoft.CodeAnalysis.GenerateDefaultConstructors;
 
internal abstract partial class AbstractGenerateDefaultConstructorsService<TService> : IGenerateDefaultConstructorsService
    where TService : AbstractGenerateDefaultConstructorsService<TService>
{
    protected abstract bool TryInitializeState(
        SemanticDocument document, TextSpan textSpan, CancellationToken cancellationToken,
        [NotNullWhen(true)] out INamedTypeSymbol? classType);
 
    public async Task<ImmutableArray<CodeAction>> GenerateDefaultConstructorsAsync(
        Document document,
        TextSpan textSpan,
        bool forRefactoring,
        CancellationToken cancellationToken)
    {
        using (Logger.LogBlock(FunctionId.Refactoring_GenerateMember_GenerateDefaultConstructors, cancellationToken))
        {
            var semanticDocument = await SemanticDocument.CreateAsync(document, cancellationToken).ConfigureAwait(false);
 
            using var _ = ArrayBuilder<CodeAction>.GetInstance(out var result);
            if (textSpan.IsEmpty)
            {
                var state = State.Generate((TService)this, semanticDocument, textSpan, forRefactoring, cancellationToken);
                if (state != null)
                {
                    foreach (var constructor in state.UnimplementedConstructors)
                        result.Add(new GenerateDefaultConstructorCodeAction(document, state, constructor));
 
                    if (state.UnimplementedConstructors.Length > 1)
                        result.Add(new CodeActionAll(document, state, state.UnimplementedConstructors));
                }
            }
 
            return result.ToImmutableAndClear();
        }
    }
}