using System;
using System.Collections.Generic;
using System.Text;
using System.Threading;
using BlubbFish.BosmonMqtt.Models;
using BosMon.Data;
using BosMon.Data.Telegrams;
using BosMon.Plugins;
using BosMon.Utils;
using LitJson;
using TelegramFilter.Filter;
using uPLibrary.Networking.M2Mqtt;
using uPLibrary.Networking.M2Mqtt.Messages;

namespace BlubbFish.BosmonMqtt.Controller {
  class MqttEventProcessor : IDisposable {
    private readonly PluginConfiguration pluginconfig;
    private readonly IBosMonHost pluginhost;
    private MqttClient client;
    private FilterList filter;
    private readonly List<FilterItem> pfilter = new List<FilterItem>();
    private readonly List<FilterItem> ffilter = new List<FilterItem>();
    private readonly List<FilterItem> zfilter = new List<FilterItem>();
    Thread connectionWatcher;

    public MqttEventProcessor(PluginConfiguration pluginconfiguration, IBosMonHost pluginHost) {
      this.pluginconfig = pluginconfiguration;
      this.pluginhost = pluginHost;
      this.Connect();
      if(this.pluginconfig.Enable) {
        this.ConnectionWatcherStart();
      }
      this.pluginconfig.ConfigChanged += this.Pluginconfig_ConfigChanged;
    }

    private void ConnectionWatcherRunner() {
      while(true) {
        try {
          Thread.Sleep(10000);
          if(!this.client.IsConnected) {
            this.Reconnect();
          }
        } catch(Exception) { }
      }
    }

    private void ConnectionWatcherStart() {
      if(this.connectionWatcher == null) {
        this.connectionWatcher = new Thread(this.ConnectionWatcherRunner);
      }
      if(this.connectionWatcher.ThreadState == ThreadState.Running || this.connectionWatcher.ThreadState == ThreadState.WaitSleepJoin) {
        return;
      }
      this.connectionWatcher.Start();
      this.Log("ConnectionWatcherStart", "Überwachungsthread gestartet.");
    }

    private void ConnectionWatcherStop() {
      if(this.connectionWatcher == null) {
        return;
      }
      try {
        this.connectionWatcher.Abort();
        Thread.Sleep(100);
        this.connectionWatcher = null;
      } catch (Exception) { }
      this.Log("ConnectionWatcherStop", "Überwachungsthread gestoppt.");
    }

    private void Pluginconfig_ConfigChanged(Object sender, EventArgs e) {
      this.Reconnect();
      if (this.pluginconfig.Enable) {
        this.ConnectionWatcherStart();
      }
      if(!this.pluginconfig.Enable) {
        this.ConnectionWatcherStop();
      }
    }

    private void Reconnect() {
      if (this.pluginconfig.Enable) {
        this.Log("Reconnect", "Reconnect ausgelößt.");
      }
      this.Disconnect();
      this.Connect();
    }

    

    private void Connect() {
      if (this.pluginconfig.Enable) {
        try {
          this.client = new MqttClient(this.pluginconfig.Server, this.pluginconfig.Port, false, null, null, MqttSslProtocols.None);
          if (this.pluginconfig.User == "" || this.pluginconfig.Password == "") {
            this.client.Connect("bosmon-" + Guid.NewGuid().ToString());
          } else {
            this.client.Connect("bosmon-" + Guid.NewGuid().ToString(), this.pluginconfig.User, this.pluginconfig.Password);
          }
          this.client.Subscribe(new String[] { this.pluginconfig.Topic }, new Byte[] { MqttMsgBase.QOS_LEVEL_AT_LEAST_ONCE });
        } catch (Exception) {
          return;
        }
        this.filter = new FilterList(this.pluginconfig.PluginStorage.GetSection("filter"));
        foreach (FilterItem item in this.filter) {
          if (item.GetType() == typeof(PocsagFilterItem)) {
            this.pfilter.Add(item as PocsagFilterItem);
          }
          if (item.GetType() == typeof(FmsFilterItem)) {
            this.ffilter.Add(item as FmsFilterItem);
          }
          if (item.GetType() == typeof(ZveiFilterItem)) {
            this.zfilter.Add(item as ZveiFilterItem);
          }
        }
        this.Log("Connect", "Erfolgreich verbunden.");
      }
    }

    private void Disconnect() {
      this.pfilter.Clear();
      this.ffilter.Clear();
      this.zfilter.Clear();
      if (this.client != null && this.client.IsConnected) {
        this.client.Unsubscribe(new String[] { this.pluginconfig.Topic });
        this.client.Disconnect();
        this.Log("Disconnect", "Verbindung getrennt.");
      }
      this.client = null;
    }

    internal void TelegramEvent(Object sender, TelegramEventArgs e) {
      if (this.pluginconfig.Enable) {
        try {
          Telegram t = e.Telegram as Telegram;
          if (this.client != null && this.client.IsConnected && this.filter != null) {
            if (this.FilterMatch(t)) {
              String text = "";
              String topic = "";
              if (t.Type == PocsagTelegram.TYPE_POCSAG) {
                PocsagTelegram p = t as PocsagTelegram;
                text = JsonMapper.ToJson(p);
                topic = this.pluginconfig.Topic + "pocsag/" + p.Address + p.Func;
              } else if(t.Type == FmsTelegram.TYPE_FMS) {
                FmsTelegram f = t as FmsTelegram;
                text = JsonMapper.ToJson(f);
                topic = this.pluginconfig.Topic + "fms/" + f.Address;
              } else if(t.Type == ZveiTelegram.TYPE_ZVEI) {
                ZveiTelegram z = t as ZveiTelegram;
                text = JsonMapper.ToJson(z);
                topic = this.pluginconfig.Topic + "zvei/" + z.Address;
              } else if (t.Type == ZveiDtmfTelegram.TYPE_ZVEIDTMF) {
                ZveiDtmfTelegram z = t as ZveiDtmfTelegram;
                text = JsonMapper.ToJson(z);
                topic = this.pluginconfig.Topic + "zveidmf/" + z.Address;
              }
              this.client.Publish(topic, Encoding.UTF8.GetBytes(text));
            }
          }
        } catch (Exception) { }
      }
    }

    private Boolean FilterMatch(Telegram t) {
      if (t.Type == PocsagTelegram.TYPE_POCSAG) {
        return this.FilterMatchType(this.pfilter, t);
      } else if(t.Type == FmsTelegram.TYPE_FMS) {
        return this.FilterMatchType(this.ffilter, t);
      } else {
        return this.FilterMatchType(this.zfilter, t);
      }
    }

    private Boolean FilterMatchType(List<FilterItem> filter, Telegram t) {
      Boolean negatedInList = false;
      if(filter.Count == 0) {
        return true;
      }
      foreach (FilterItem item in filter) {
        if (item.IsMatching(t) && item.Negated) {
          return false;
        }
        if(item.IsMatching(t) && !item.Negated) {
          return true;
        }
        if(item.Negated) {
          negatedInList = true;
        }
      }
      return negatedInList;
    }

    private void Log(String method, String text) {
      BosMonLog.Logger.WriteLine(LogSeverity.Info, "BosmonMqtt.MqttEventProcessor", method, text);
      this.pluginhost.AddMessage(DateTime.Now.Ticks, MessageType.Message, "BosmonMqtt " + text);
    }

    #region IDisposable Support
    private Boolean disposedValue = false;
    

    protected virtual void Dispose(Boolean disposing) {
      if (!this.disposedValue) {
        if (disposing) {
          this.ConnectionWatcherStop();
          this.Disconnect();
        }
        this.disposedValue = true;
      }
    }

    public void Dispose() {
      Dispose(true);
    }
    #endregion
  }
}