using Edge.Core.Parser.BinaryParser;
using Edge.Core.Parser.BinaryParser.MessageEntity;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace VeederRoot_ATG_Console
{
    /// <summary>
    /// Used for 2 kinds of message parsing: 
    ///     - VR ATG message, with format like <SOH>i201xxxxxxxxx<ETX>
    ///     - DispenserInterface messages, with format like <SOH>Bxxxxxxx<ETX>
    /// </summary>
    public class Parser : ParserBase
    {
        public Parser() : base(new MessageTemplateLookup()) { }

        public int CaculateCheckSum(byte[] msg)
        {
            int checkSum = 0;
            for (int i = 0; i < msg.Length; i++)
            {
                checkSum += msg[i];
            }

            return 0x10000 - (checkSum % 0x10000);
        }

        //public byte[] CaculateCheckSumToAscII2Bytes(byte[] msg)
        //{
        //    var checksum = this.CaculateCheckSum(msg);
        //    var r = ASCIIEncoding.ASCII.GetBytes(checksum.ToString("X4"));
        //    return r;
        //}

        //public override MessageTemplateBase Deserialize(byte[] rawData)
        //{
        //    return base.Deserialize(rawData.Take(rawData.Length - 1).ToArray());
        //}

        public override byte[] Serialize(MessageTemplateBase message)
        {
            var serializedBytes = base.Serialize(message);
            if (message is MessageEntity.DispenserInterface.Outgoing.OutgoingMessageBase)
            {
                var dispenserIfMsg = message as MessageEntity.DispenserInterface.Outgoing.OutgoingMessageBase;
                var appendWithCheckSum = serializedBytes.Take(serializedBytes.Length - 1)
                     .Concat(Encoding.ASCII.GetBytes(
                           CaculateCheckSum(serializedBytes.Take(serializedBytes.Length - 1).ToArray()).ToString("X4")))
                     .Concat(new byte[] { serializedBytes.Last() });
                return appendWithCheckSum.ToArray();
            }

            return serializedBytes;
        }
    }
}