using System;
using System.Linq;
using System.Threading.Tasks;
using Kreta.Core.MessageBroker;
using Kreta.Core.MessageBroker.Client.Implementations;
using Kreta.Core.MessageBroker.Contract;
using Kreta.Core.MessageBroker.Logging;
using Kreta.Core.MessageBroker.Logging.Serilog;
using Kreta.MessageBroker.ClientFactory;
using Kreta.MessageBroker.Configuration;
using Kreta.MessageBroker.TraceLog;
using log4net;

namespace Kreta.MessageBroker.Client
{
    /// <summary>
    /// Message client
    /// </summary>
    /// <typeparam name="T">Message object</typeparam>
    abstract class MessageClient<T> : IMessageClient<T>
        where T : Message
    {
        #region [Properties]

        private IntegratedMessageClient<T> IntegratedMessageClient { get; }

        private string MessageSignatureKey { get; }

        private int QueueSize { get; }

        #endregion

        #region [Public Methods]

        /// <summary>
        /// Üzenet küldése
        /// </summary>
        /// <param name="message">Üzenet</param>
        /// <remarks>A metódus az üzenetet várakozási sorba helyezi és azonal visszatér.
        /// Ha a várakozási sor megtellik, az üzenetet eldobja</remarks>
        public async Task PostAsync(T message)
        {
            message.CreateSignature(this.MessageSignatureKey);

            await this.IntegratedMessageClient.PostAsync(message);
        }

        /// <summary>
        /// Üzenet küldése
        /// </summary>
        /// <param name="message">Üzenet</param>        
        public void Post(T message)
        {
            if (this.QueueSize == 0)
            {
                Task.Run(async () => await PostAsync(message));
            }
            else
            {
                PostAsync(message).Wait();
            }
        }

        /// <summary>
        /// Üzenet tömb küldése
        /// </summary>
        /// <param name="messages">Üzenetek</param>
        /// <remarks>A metódus addig nem tér vissza amig el nem küldtük az összes üzenetet</remarks>
        public async Task PostAsync(T[] messages)
        {
            foreach (var message in messages)
            {
                message.CreateSignature(this.MessageSignatureKey);
            }

            await this.IntegratedMessageClient.PostAsync(messages);
        }

        /// <summary>
        /// Üzenet tömb küldése
        /// </summary>
        /// <param name="messages">Üzenetek</param>
        /// <remarks>A metódus addig nem tér vissza amig el nem küldtük az összes üzenetet</remarks>
        public void Post(T[] messages)
        {
            PostAsync(messages).Wait();
        }

        #endregion

        #region [Constructor(s)]

        /// <summary>
        /// Constructor
        /// </summary>
        /// <param name="jsonMessageClientFactory">Json message client factory</param>
        /// <param name="messageClientName">Message client name</param>
        /// <param name="configuration">Configuration</param>
        /// <param name="loggerName">Logger name</param>
        protected MessageClient(string messageClientName, IJsonMessageClientFactory<T> jsonMessageClientFactory, IMessageBrokerConfiguration configuration, ITraceMessageClient traceMessageClient, ISerilogTraceLogger serilogTraceLogger, string loggerName)
        {
            if (string.IsNullOrWhiteSpace(messageClientName))
            {
                throw new ArgumentException($"{nameof(messageClientName)} cannot be null or whitespace");
            }

            if (jsonMessageClientFactory == null)
            {
                throw new ArgumentNullException(nameof(jsonMessageClientFactory));
            }

            if (traceMessageClient == null)
            {
                throw new ArgumentNullException(nameof(traceMessageClient));
            }

            if (configuration == null)
            {
                throw new ArgumentNullException(nameof(configuration));
            }

            var clientConfiguration = configuration.Clients.Cast<MessageClientConfigurationElement>().FirstOrDefault(c => c.Name.Equals(messageClientName, StringComparison.OrdinalIgnoreCase));

            if (clientConfiguration == null)
            {
                throw new ArgumentException($"Client configuration was not found for client {messageClientName}");
            }

            this.QueueSize = clientConfiguration.QueueSize;

            if (string.IsNullOrWhiteSpace(clientConfiguration.MessageSignatureKey))
            {
                throw new ArgumentException($"{nameof(clientConfiguration.MessageSignatureKey)} cannot be null or whitespace");
            }

            this.MessageSignatureKey = clientConfiguration.MessageSignatureKey;

            if (string.IsNullOrWhiteSpace(loggerName))
            {
                throw new ArgumentException($"{nameof(loggerName)} cannot be null or whitespace");
            }

            IKeyValueLogger keyValueLogger = null;

            if (clientConfiguration.LoggerType == LoggerType.Log4Net)
            {
                keyValueLogger = new Log4NetKeyValueLogger(LogManager.GetLogger(loggerName));
            }
            else if (clientConfiguration.LoggerType == LoggerType.Serilog)
            {
                keyValueLogger = new SerilogKeyValueLogger(clientConfiguration.SerilogLogger, serilogTraceLogger);
            }
            else
            {
                throw new NotSupportedException($"Not supported logger type {clientConfiguration.LoggerType}");
            }

            this.IntegratedMessageClient = new IntegratedMessageClient<T>(clientConfiguration, jsonMessageClientFactory, keyValueLogger, traceMessageClient);
        }

        #endregion
    }
}