// 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.Threading;
using Microsoft.CodeAnalysis.Host;
using Microsoft.CodeAnalysis.Shared.Extensions.ContextQuery;

namespace Microsoft.CodeAnalysis.Recommendations;

internal interface IRecommendationService : ILanguageService
{
    RecommendedSymbols GetRecommendedSymbolsInContext(
        SyntaxContext syntaxContext,
        RecommendationServiceOptions options,
        CancellationToken cancellationToken);
}

internal readonly struct RecommendedSymbols(
    ImmutableArray<ISymbol> namedSymbols,
    ImmutableArray<ISymbol> unnamedSymbols = default)
{

    /// <summary>
    /// The named symbols to recommend.
    /// </summary>
    public ImmutableArray<ISymbol> NamedSymbols => namedSymbols.NullToEmpty();

    /// <summary>
    /// The unnamed symbols to recommend.  For example, operators, conversions and indexers.
    /// </summary>
    public ImmutableArray<ISymbol> UnnamedSymbols => unnamedSymbols.NullToEmpty();

    public RecommendedSymbols(ImmutableArray<ISymbol> namedSymbols)
        : this(namedSymbols, default)
    {
    }
}