// 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;
using System.Diagnostics;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.CodeAnalysis.ErrorReporting;
using Microsoft.CodeAnalysis.Host;
using Microsoft.CodeAnalysis.Internal.Log;
using Microsoft.CodeAnalysis.Shared.TestHooks;
using Microsoft.CodeAnalysis.Telemetry;
using Microsoft.ServiceHub.Client;
using Microsoft.ServiceHub.Framework;
 
namespace Microsoft.CodeAnalysis.Remote;
 
internal sealed partial class ServiceHubRemoteHostClient : RemoteHostClient
{
    private readonly SolutionServices _services;
    private readonly SolutionAssetStorage _assetStorage;
    private readonly HubClient _hubClient;
    private readonly ServiceBrokerClient _serviceBrokerClient;
    private readonly IErrorReportingService? _errorReportingService;
    private readonly IRemoteHostClientShutdownCancellationService? _shutdownCancellationService;
    private readonly IRemoteServiceCallbackDispatcherProvider _callbackDispatcherProvider;
 
    public readonly RemoteProcessConfiguration Configuration;
 
    private Process? _remoteProcess;
 
    private ServiceHubRemoteHostClient(
        SolutionServices services,
        RemoteProcessConfiguration configuration,
        ServiceBrokerClient serviceBrokerClient,
        HubClient hubClient,
        IRemoteServiceCallbackDispatcherProvider callbackDispatcherProvider)
    {
        // use the hub client logger for unexpected exceptions from devenv as well, so we have complete information in the log:
        services.GetService<IWorkspaceTelemetryService>()?.RegisterUnexpectedExceptionLogger(hubClient.Logger);
 
        _services = services;
        _serviceBrokerClient = serviceBrokerClient;
        _hubClient = hubClient;
        _callbackDispatcherProvider = callbackDispatcherProvider;
 
        _assetStorage = services.GetRequiredService<ISolutionAssetStorageProvider>().AssetStorage;
        _errorReportingService = services.GetService<IErrorReportingService>();
        _shutdownCancellationService = services.GetService<IRemoteHostClientShutdownCancellationService>();
        Configuration = configuration;
    }
 
    public static async Task<RemoteHostClient> CreateAsync(
        SolutionServices services,
        RemoteProcessConfiguration configuration,
        AsynchronousOperationListenerProvider listenerProvider,
        IServiceBroker serviceBroker,
        RemoteServiceCallbackDispatcherRegistry callbackDispatchers,
        CancellationToken cancellationToken)
    {
        using (Logger.LogBlock(FunctionId.ServiceHubRemoteHostClient_CreateAsync, KeyValueLogMessage.NoProperty, cancellationToken))
        {
#pragma warning disable ISB001    // Dispose of proxies
#pragma warning disable VSTHRD012 // Provide JoinableTaskFactory where allowed
            var serviceBrokerClient = new ServiceBrokerClient(serviceBroker);
#pragma warning restore
 
            var hubClient = new HubClient("ManagedLanguage.IDE.RemoteHostClient");
 
            var client = new ServiceHubRemoteHostClient(services, configuration, serviceBrokerClient, hubClient, callbackDispatchers);
 
            var workspaceConfigurationService = services.GetRequiredService<IWorkspaceConfigurationService>();
 
            var remoteProcessId = await client.TryInvokeAsync<IRemoteProcessTelemetryService, int>(
                (service, cancellationToken) => service.InitializeAsync(workspaceConfigurationService.Options, cancellationToken),
                cancellationToken).ConfigureAwait(false);
 
            if (remoteProcessId.HasValue)
            {
                try
                {
                    client._remoteProcess = Process.GetProcessById(remoteProcessId.Value);
                }
                catch (Exception e)
                {
                    hubClient.Logger.TraceEvent(TraceEventType.Error, 1, $"Unable to find Roslyn ServiceHub process: {e.Message}");
                }
            }
            else
            {
                hubClient.Logger.TraceEvent(TraceEventType.Error, 1, "Roslyn ServiceHub process initialization failed.");
            }
 
            await client.TryInvokeAsync<IRemoteAsynchronousOperationListenerService>(
                (service, cancellationToken) => service.EnableAsync(AsynchronousOperationListenerProvider.IsEnabled, listenerProvider.DiagnosticTokensEnabled, cancellationToken),
                cancellationToken).ConfigureAwait(false);
 
            return client;
        }
    }
 
    /// <summary>
    /// Creates connection to built-in remote service.
    /// </summary>
    public override RemoteServiceConnection<T> CreateConnection<T>(object? callbackTarget)
        => CreateConnection<T>(ServiceDescriptors.Instance, _callbackDispatcherProvider, callbackTarget);
 
    /// <summary>
    /// This overload is meant to be used by partner teams from their External Access layer.
    /// </summary>
    internal RemoteServiceConnection<T> CreateConnection<T>(ServiceDescriptors descriptors, IRemoteServiceCallbackDispatcherProvider callbackDispatcherProvider, object? callbackTarget) where T : class
    {
        var descriptor = descriptors.GetServiceDescriptor(typeof(T), Configuration);
        var callbackDispatcher = (descriptor.ClientInterface != null) ? callbackDispatcherProvider.GetDispatcher(typeof(T)) : null;
 
        return new BrokeredServiceConnection<T>(
            descriptor,
            callbackTarget,
            callbackDispatcher,
            _serviceBrokerClient,
            _assetStorage,
            _errorReportingService,
            _shutdownCancellationService,
            _remoteProcess);
    }
 
    public override void Dispose()
    {
        _services.GetService<IWorkspaceTelemetryService>()?.UnregisterUnexpectedExceptionLogger(_hubClient.Logger);
        _hubClient.Dispose();
 
        _serviceBrokerClient.Dispose();
    }
}