using Edge.Core.Parser.BinaryParser.Util;
using Edge.Core.Processor.Communicator;
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Text;

namespace GroWattInverter
{
    public class TimeWindowMessageCutter : IMessageCutter<byte[]>, IDisposable
    {
        /// <summary>
        /// each this time(from first byte received) elapsed, will fire a message out.
        /// </summary>
        private int timeWindowTimedoutValue = 1000;
        public byte[] Message { get; set; }

        public event EventHandler OnMessageCut;
        public event EventHandler<MessageCutterInvalidMessageReadEventArg> OnInvalidMessageRead;

        private List<byte> buffer = new List<byte>();
        private System.Timers.Timer timer;

        public TimeWindowMessageCutter()
        {
            this.timer = new System.Timers.Timer();
            this.timer.Interval = this.timeWindowTimedoutValue;
            this.timer.Elapsed += (s, a) =>
            {
                this.timer.Stop();
                this.Message = buffer.ToArray();
                if (this.Message.Length <= 6) OnInvalidMessageRead?.Invoke(this, new MessageCutterInvalidMessageReadEventArg()
                {
                    Message = $"Raw msg: 0x{this.Message.ToHexLogString()} does not meet the min length(valid Len must >6) requirment"
                });
                this.OnMessageCut?.Invoke(this, new EventArgs());
                this.buffer.Clear();
            };
        }

        public void Feed(byte[] data)
        {
            this.buffer.AddRange(data);
            if (!this.timer.Enabled) this.timer.Start();
        }

        public void Dispose()
        {
            this.timer?.Stop();
        }
    }
}