// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
 
using Grpc.Core;
 
namespace Aspire.Hosting.Tests.Utils.Grpc;
 
public class TestServerCallContext : ServerCallContext
{
    private readonly Metadata _requestHeaders;
    private readonly CancellationToken _cancellationToken;
    private readonly Metadata _responseTrailers;
    private readonly AuthContext _authContext;
    private readonly Dictionary<object, object> _userState;
    private WriteOptions? _writeOptions;
 
    public Metadata? ResponseHeaders { get; private set; }
 
    private TestServerCallContext(Metadata requestHeaders, CancellationToken cancellationToken)
    {
        _requestHeaders = requestHeaders;
        _cancellationToken = cancellationToken;
        _responseTrailers = new Metadata();
        _authContext = new AuthContext(string.Empty, new Dictionary<string, List<AuthProperty>>());
        _userState = new Dictionary<object, object>();
    }
 
    protected override string MethodCore => "MethodName";
    protected override string HostCore => "HostName";
    protected override string PeerCore => "PeerName";
    protected override DateTime DeadlineCore { get; }
    protected override Metadata RequestHeadersCore => _requestHeaders;
    protected override CancellationToken CancellationTokenCore => _cancellationToken;
    protected override Metadata ResponseTrailersCore => _responseTrailers;
    protected override Status StatusCore { get; set; }
    protected override WriteOptions? WriteOptionsCore { get => _writeOptions; set { _writeOptions = value; } }
    protected override AuthContext AuthContextCore => _authContext;
 
    protected override ContextPropagationToken CreatePropagationTokenCore(ContextPropagationOptions? options)
    {
        throw new NotImplementedException();
    }
 
    protected override Task WriteResponseHeadersAsyncCore(Metadata responseHeaders)
    {
        if (ResponseHeaders != null)
        {
            throw new InvalidOperationException("Response headers have already been written.");
        }
 
        ResponseHeaders = responseHeaders;
        return Task.CompletedTask;
    }
 
    protected override IDictionary<object, object> UserStateCore => _userState;
 
    public static TestServerCallContext Create(Metadata? requestHeaders = null, CancellationToken cancellationToken = default)
    {
        return new TestServerCallContext(requestHeaders ?? new Metadata(), cancellationToken);
    }
}