// 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.Net;
using System.Net.Security;
using System.Security.Authentication;
using MQTTnet.Certificates;
using System.Threading.Tasks;

#if !WINDOWS_UWP
using System.Security.Cryptography.X509Certificates;
#endif

// ReSharper disable UnusedMember.Global
namespace MQTTnet.Server
{
    public class MqttServerOptionsBuilder
    {
        readonly MqttServerOptions _options = new MqttServerOptions();
        
        public MqttServerOptionsBuilder WithConnectionBacklog(int value)
        {
            _options.DefaultEndpointOptions.ConnectionBacklog = value;
            _options.TlsEndpointOptions.ConnectionBacklog = value;
            return this;
        }

        public MqttServerOptionsBuilder WithMaxPendingMessagesPerClient(int value)
        {
            _options.MaxPendingMessagesPerClient = value;
            return this;
        }

        public MqttServerOptionsBuilder WithDefaultCommunicationTimeout(TimeSpan value)
        {
            _options.DefaultCommunicationTimeout = value;
            return this;
        }

        public MqttServerOptionsBuilder WithDefaultEndpoint()
        {
            _options.DefaultEndpointOptions.IsEnabled = true;
            return this;
        }

        public MqttServerOptionsBuilder WithDefaultEndpointPort(int value)
        {
            _options.DefaultEndpointOptions.Port = value;
            return this;
        }

        public MqttServerOptionsBuilder WithDefaultEndpointBoundIPAddress(IPAddress value)
        {
            _options.DefaultEndpointOptions.BoundInterNetworkAddress = value ?? IPAddress.Any;
            return this;
        }

        public MqttServerOptionsBuilder WithDefaultEndpointBoundIPV6Address(IPAddress value)
        {
            _options.DefaultEndpointOptions.BoundInterNetworkV6Address = value ?? IPAddress.Any;
            return this;
        }

        public MqttServerOptionsBuilder WithoutDefaultEndpoint()
        {
            _options.DefaultEndpointOptions.IsEnabled = false;
            return this;
        }

        public MqttServerOptionsBuilder WithEncryptedEndpoint()
        {
            _options.TlsEndpointOptions.IsEnabled = true;
            return this;
        }

        public MqttServerOptionsBuilder WithEncryptedEndpointPort(int value)
        {
            _options.TlsEndpointOptions.Port = value;
            return this;
        }

        public MqttServerOptionsBuilder WithEncryptedEndpointBoundIPAddress(IPAddress value)
        {
            _options.TlsEndpointOptions.BoundInterNetworkAddress = value;
            return this;
        }

        public MqttServerOptionsBuilder WithEncryptedEndpointBoundIPV6Address(IPAddress value)
        {
            _options.TlsEndpointOptions.BoundInterNetworkV6Address = value;
            return this;
        }

#if !WINDOWS_UWP
        public MqttServerOptionsBuilder WithEncryptionCertificate(byte[] value, IMqttServerCertificateCredentials credentials = null)
        {
            if (value == null) throw new ArgumentNullException(nameof(value));

            _options.TlsEndpointOptions.CertificateProvider = new BlobCertificateProvider(value)
            {
                Password = credentials?.Password
            };

            return this;
        }

        public MqttServerOptionsBuilder WithEncryptionCertificate(X509Certificate2 certificate)
        {
            if (certificate == null) throw new ArgumentNullException(nameof(certificate));

            _options.TlsEndpointOptions.CertificateProvider = new X509CertificateProvider(certificate);
            return this;
        }
#endif

        public MqttServerOptionsBuilder WithEncryptionSslProtocol(SslProtocols value)
        {
            _options.TlsEndpointOptions.SslProtocol = value;
            return this;
        }

#if !WINDOWS_UWP
        public MqttServerOptionsBuilder WithClientCertificate(RemoteCertificateValidationCallback validationCallback = null, bool checkCertificateRevocation = false)
        {
            _options.TlsEndpointOptions.ClientCertificateRequired = true;
            _options.TlsEndpointOptions.CheckCertificateRevocation = checkCertificateRevocation;
            _options.TlsEndpointOptions.RemoteCertificateValidationCallback = validationCallback;
            return this;
        }
#endif

        public MqttServerOptionsBuilder WithoutEncryptedEndpoint()
        {
            _options.TlsEndpointOptions.IsEnabled = false;
            return this;
        }

#if !WINDOWS_UWP
        public MqttServerOptionsBuilder WithRemoteCertificateValidationCallback(RemoteCertificateValidationCallback value)
        {
            _options.TlsEndpointOptions.RemoteCertificateValidationCallback = value;
            return this;
        }
#endif
        
        // public MqttServerOptionsBuilder WithApplicationMessageInterceptor(IMqttServerApplicationMessageInterceptor value)
        // {
        //     _options.ApplicationMessageInterceptor = value;
        //     return this;
        // }
        //
        // public MqttServerOptionsBuilder WithApplicationMessageInterceptor(Action<InterceptingMqttClientPublishEventArgs> value)
        // {
        //     _options.ApplicationMessageInterceptor = new MqttServerApplicationMessageInterceptorDelegate(value);
        //     return this;
        // }
        //
        // public MqttServerOptionsBuilder WithApplicationMessageInterceptor(Func<InterceptingMqttClientPublishEventArgs, Task> value)
        // {
        //     _options.ApplicationMessageInterceptor = new MqttServerApplicationMessageInterceptorDelegate(value);
        //     return this;
        // }

        // public MqttServerOptionsBuilder WithMultiThreadedApplicationMessageInterceptor(Action<InterceptingMqttClientPublishEventArgs> value)
        // {
        //     _options.ApplicationMessageInterceptor = new MqttServerMultiThreadedApplicationMessageInterceptorDelegate(value);
        //     return this;
        // }
        //
        // public MqttServerOptionsBuilder WithMultiThreadedApplicationMessageInterceptor(Func<InterceptingMqttClientPublishEventArgs, Task> value)
        // {
        //     _options.ApplicationMessageInterceptor = new MqttServerMultiThreadedApplicationMessageInterceptorDelegate(value);
        //     return this;
        // }
        
        public MqttServerOptionsBuilder WithDefaultEndpointReuseAddress()
        {
            _options.DefaultEndpointOptions.ReuseAddress = true;
            return this;
        }

        public MqttServerOptionsBuilder WithTlsEndpointReuseAddress()
        {
            _options.TlsEndpointOptions.ReuseAddress = true;
            return this;
        }

        public MqttServerOptionsBuilder WithPersistentSessions(bool value = true)
        {
            _options.EnablePersistentSessions = value;
            return this;
        }
        
        // /// <summary>
        // /// Gets or sets the client ID which is used when publishing messages from the server directly.
        // /// </summary>
        // public MqttServerOptionsBuilder WithClientId(string value)
        // {
        //     _options.ClientId = value;
        //     return this;
        // }

        public MqttServerOptions Build()
        {
            return _options;
        }
    }
}