// 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 System.Threading.Tasks;
using Microsoft.CodeAnalysis.CSharp.Completion.Providers.DeclarationName;
using Microsoft.CodeAnalysis.CSharp.Extensions.ContextQuery;
using Microsoft.CodeAnalysis.PooledObjects;
 
namespace Microsoft.CodeAnalysis.CSharp.ExternalAccess.Pythia.Api
{
    internal interface IPythiaDeclarationNameRecommenderImplementation
    {
        /// <summary>
        /// Order of returned recommendation decides the order of those items in completion list
        /// </summary>
        public Task<ImmutableArray<string>> ProvideRecommendationsAsync(PythiaDeclarationNameContext context, CancellationToken cancellationToken);
    }
 
    internal readonly struct PythiaDeclarationNameContext
    {
        private readonly CSharpSyntaxContext _context;
 
        public Document Document => _context.Document;
 
        public int Position => _context.Position;
 
        public SemanticModel SemanticModel => _context.SemanticModel;
 
        /// <summary>
        /// The token to the left of <see cref="Position"/>. This token may be touching the position.
        /// </summary>
        public SyntaxToken LeftToken => _context.LeftToken;
 
        public PythiaDeclarationNameContext(CSharpSyntaxContext context)
        {
            _context = context;
        }
    }
}