// Copyright (c) 2024-present schick Informatik
// Description: The purpose of telemetry is to record message transmission times (and failures)

using System;
using System.Collections.Generic;
using log4net;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace bsmd.database
{

    public class MessageTelemetry
    {

        #region Fields

        private static readonly Dictionary<Message.NSWProvider, Dictionary<Guid, MessageTelemetry>> _telemetry = new Dictionary<Message.NSWProvider, Dictionary<Guid, MessageTelemetry>>();

        private static readonly ILog _log = LogManager.GetLogger(typeof(MessageTelemetry));

        #endregion

        #region Properties

        public DateTime SendDate { get; private set; }

        public int NumTries { get; set; }

        #endregion

        #region public static methods

        public static void Enqueue(Message.NSWProvider provider, Message message)
        {
            // Validate inputs
            if (message == null)
            {
                _log.ErrorFormat("Enqueue called with null message for provider {0}", provider);
                return;
            }

            if (!message.Id.HasValue)
            {
                _log.ErrorFormat("Enqueue called with message that has no Id assigned for provider {0}", provider);
                return;
            }

            if (!_telemetry.ContainsKey(provider))
                _telemetry.Add(provider, new Dictionary<Guid, MessageTelemetry>());

            Guid messageId = message.Id.Value;

            if (_telemetry[provider].ContainsKey(messageId))
            {
                _telemetry[provider][messageId].NumTries++;
            }
            else
            {
                MessageTelemetry mt = new MessageTelemetry();
                mt.SendDate = DateTime.Now;
                mt.NumTries = 1;
                _telemetry[provider][messageId] = mt;
            }
        }

        public static void Dequeue(Message.NSWProvider provider, Message message)
        {
            if (message == null)
            {
                _log.ErrorFormat("Dequeue called with null message for provider {0}", provider);
                return;
            }

            if (!message.Id.HasValue)
            {
                _log.ErrorFormat("Dequeue called with message that has no Id assigned for provider {0}", provider);
                return;
            }

            if (_telemetry.ContainsKey(provider))
            {
                Guid messageId = message.Id.Value;
                if (_telemetry[provider].ContainsKey(messageId))
                {
                    MessageTelemetry mt = _telemetry[provider][messageId];
                    _log.InfoFormat("[{0,10}][{1,8}][{2:00000}][{3:00}] ", provider, message.MessageNotificationClassDisplay, (DateTime.Now - mt.SendDate).TotalSeconds, mt.NumTries);
                    _telemetry[provider].Remove(messageId);
                }
                else
                {
                    _log.WarnFormat("trying to deque a message from telemetry that we don't know about. Provider: {0} MessageId: {1}",
                        provider.ToString(), messageId);
                }
            }
        }

        #endregion


    }
}