namespace Common.Hardware.SIRT
{
    using Common.Hardware.Ports;

    using System;
    using System.Collections.Concurrent;

    using Parity = System.IO.Ports.Parity;
    using StopBits = System.IO.Ports.StopBits;

    public partial class SIRTBroadcaster
    {
        public SIRTBroadcaster(string comPort)
        {
            this.serialPort = new SerialPort(comPort, 115200, Parity.None, 8, StopBits.One);
            this.tasks = new ConcurrentDictionary<uint, ConcurrentQueue<SIRTTask>>();
        }

        public event Action Activated;
        public event Action Connected;
        public event Action Disconnected;
        public event Action<string> Logging;
        public event Action<SIRTMessage> MessageReceived;

        public string COMPort => this.serialPort.COMPort;

        public string HexId { get; protected set; }

        public int Frequency { get; protected set; }

        public void Close()
        {
            this.serialPort.Close();

            this.HexId = null;
            this.Frequency = 0;
            this.serialPort.Connected -= this.SerialPort_Connected;
            this.serialPort.Disconnected -= this.SerialPort_Disconnected;
            this.serialPort.Logging -= this.SerialPort_Logging;
            this.Activated -= this.StartProcessingTasksAsync;
            this.MessageReceived -= this.SIRTConnection_MessageReceived;
        }

        public void Open()
        {
            if (!this.serialPort.IsOpen)
            {
                this.serialPort.Connected += this.SerialPort_Connected;
                this.serialPort.Disconnected += this.SerialPort_Disconnected;
                this.serialPort.Logging += this.SerialPort_Logging;
                this.Activated += this.StartProcessingTasksAsync;
                this.MessageReceived += this.SIRTConnection_MessageReceived;

                this.serialPort.Open();
            }
        }

        public void DequeueTasks(uint address)
        {
            if (this.tasks.TryRemove(address, out var tasksQueue))
            {
                while (tasksQueue.TryDequeue(out var task))
                {
                    this.TaskRemoveEventHandlers(task);
                }
            }
        }

        public void EnqueueTask(SIRTTask task)
        {
            if (this.Frequency == task.Frequency)
            {
                this.TaskAddEventHandlers(task);

                var requestTasks = this.tasks.GetOrAdd(task.RequestAddress, new ConcurrentQueue<SIRTTask>());

                requestTasks.Enqueue(task);

                if (task.RequestAddress != task.ResponseAddress)
                {
                    this.tasks.AddOrUpdate(task.ResponseAddress, requestTasks, (_, _requestTasks) => _requestTasks);
                }
            }
        }

        public void RemoveConnection() 
            => this.serialPort.RemoveConnection();
    }
}