// 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
    {
        private readonly ImmutableArray<ISymbol> _namedSymbols;
        private readonly ImmutableArray<ISymbol> _unnamedSymbols;
 
        /// <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)
        {
        }
 
        public RecommendedSymbols(
            ImmutableArray<ISymbol> namedSymbols,
            ImmutableArray<ISymbol> unnamedSymbols = default)
        {
            _namedSymbols = namedSymbols;
            _unnamedSymbols = unnamedSymbols;
        }
    }
}