// 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.Threading;
using System.Threading.Tasks;
using Microsoft.CodeAnalysis.Options;
using Roslyn.LanguageServer.Protocol;
using Roslyn.Utilities;
using LSP = Roslyn.LanguageServer.Protocol;
 
namespace Microsoft.CodeAnalysis.LanguageServer.Handler.SemanticTokens
{
    [Method(Methods.TextDocumentSemanticTokensRangeName)]
    internal class SemanticTokensRangeHandler : ILspServiceDocumentRequestHandler<SemanticTokensRangeParams, LSP.SemanticTokens>
    {
        private readonly IGlobalOptionService _globalOptions;
        private readonly SemanticTokensRefreshQueue _semanticTokenRefreshQueue;
 
        public bool MutatesSolutionState => false;
        public bool RequiresLSPSolution => true;
 
        public SemanticTokensRangeHandler(
            IGlobalOptionService globalOptions,
            SemanticTokensRefreshQueue semanticTokensRefreshQueue)
        {
            _globalOptions = globalOptions;
            _semanticTokenRefreshQueue = semanticTokensRefreshQueue;
        }
 
        public TextDocumentIdentifier GetTextDocumentIdentifier(LSP.SemanticTokensRangeParams request)
        {
            Contract.ThrowIfNull(request.TextDocument);
            return request.TextDocument;
        }
 
        public async Task<LSP.SemanticTokens> HandleRequestAsync(
            SemanticTokensRangeParams request,
            RequestContext context,
            CancellationToken cancellationToken)
        {
            Contract.ThrowIfNull(request.TextDocument, "TextDocument is null.");
            var ranges = new[] { request.Range };
            var tokensData = await SemanticTokensHelpers.HandleRequestHelperAsync(_globalOptions, _semanticTokenRefreshQueue, ranges, context, cancellationToken).ConfigureAwait(false);
            return new LSP.SemanticTokens { Data = tokensData };
        }
    }
}