namespace JiLinApp.Docking.FenceAlarm;

public class AlarmEncode
{
    #region Fields

    public static readonly byte Version = 0x12;
    public static readonly byte[] Head = new byte[] { 0xF0, 0xFA };
    public static readonly byte End = 0x0D;

    public static readonly byte[] TEA_key = new byte[16] {
        0x08,0x01,0x08,0x06,0x07,0x08,0x07,0x08,
        0x08,0x90,0xC5,0x04,0x0D,0x0E,0x0F,0x10
     };

    #endregion Fields

    public static byte[] EncodeMessage(byte[] msg)
    {
        if (!CheckMessage(msg)) return Array.Empty<byte>();
        return GetMessage(msg[0], BteaEncrypt(GetContent(msg, msg[0] - 1)));
    }

    public static byte[] DecodeMessage(byte[] msg)
    {
        if (!CheckMessage(msg)) return Array.Empty<byte>();
        return GetMessage(msg[0], BteaDecrpyt(GetContent(msg, msg[0] - 1)));
    }

    private static bool CheckMessage(byte[] msg)
    {
        if (msg == null) return false;
        if (msg[0] > msg.Length) return false;
        return true;
    }

    private static byte[] GetMessage(byte msgLen, byte[] msg)
    {
        byte[] outMsg = new byte[msg.Length + 1];
        outMsg[0] = msgLen;
        for (int i = 0; i < msg.Length; i++)
        {
            outMsg[i + 1] = msg[i];
        }
        return outMsg;
    }

    private static byte[] GetContent(byte[] msg, int len)
    {
        byte[] bytes = new byte[len];
        for (int i = 0; i < len; i++)
        {
            bytes[i] = msg[i + 1];
        }
        return bytes;
    }

    public static byte[] GetSendMessage(byte command, byte[] data)
    {
        byte[] msg = data != null ? new byte[data.Length + 8] : new byte[8];
        msg[0] = (byte)msg.Length;
        msg[1] = Version;
        msg[2] = Head[0];
        msg[3] = Head[1];
        msg[4] = command;
        if (data != null)
        {
            for (int i = 0; i < data.Length; i++)
            {
                msg[i + 5] = data[i];
            }
        }
        byte[] subMsg = data != null ? new byte[data.Length + 4] : new byte[4];
        for (int i = 0; i < subMsg.Length; i++)
        {
            subMsg[i] = msg[i + 1];
        }
        byte[] crc = CRC16(subMsg);
        msg[^3] = crc[1];
        msg[^2] = crc[0];
        msg[^1] = End;
        return msg;
    }

    public static byte[] CRC16(byte[] data)
    {
        int len = data.Length;
        if (len > 0)
        {
            ushort crc = 0xFFFF;
            for (int i = 0; i < len; i++)
            {
                crc = (ushort)(crc ^ (data[i]));
                for (int j = 0; j < 8; j++)
                {
                    crc = (crc & 1) != 0 ? (ushort)((crc >> 1) ^ 0xA001) : (ushort)(crc >> 1);
                }
            }
            byte hi = (byte)((crc & 0xFF00) >> 8); //高位置
            byte lo = (byte)(crc & 0x00FF); //低位置
            return new byte[] { hi, lo };
        }
        return new byte[] { 0, 0 };
    }

    private static byte[] BteaEncrypt(byte[] bytes)
    {
        byte[] output = new byte[bytes.Length];
        for (int i = 0; i < bytes.Length; i++)
        {
            byte abyte = (byte)(bytes[i] ^ TEA_key[i % 16]);
            output[i] = (byte)(((byte)(abyte >> 3)) | ((byte)(abyte << 5)));
        }
        return output;
    }

    private static byte[] BteaDecrpyt(byte[] bytes)
    {
        byte[] output = new byte[bytes.Length];
        for (int i = 0; i < bytes.Length; i++)
        {
            byte abyte = (byte)(((byte)(bytes[i] << 3)) | ((byte)(bytes[i] >> 5)));
            output[i] = (byte)(abyte ^ TEA_key[i % 16]);
        }
        return output;
    }
}

public enum DeviceCmd : byte
{
    /// <summary>
    /// 心跳
    /// </summary>
    HeartBeatCmd = 0x01,

    /// <summary>
    /// 报警
    /// </summary>
    AlarmCmd = 0x02,

    /// <summary>
    /// 所有防区状态
    /// </summary>
    AllSectorStateCmd = 0x03,

    /// <summary>
    /// 实时防区状态
    /// </summary>
    RtSectorStateCmd = 0x04,

    /// <summary>
    /// 最大防区号
    /// </summary>
    MaxSectorTotalCmd = 0x05,

    /// <summary>
    /// 报警主机设置参数返回服务器
    /// </summary>
    BackSettingsCmd = 0x08,

    /// <summary>
    /// 布防指令
    /// </summary>
    DefenceCmd = 0x80,

    /// <summary>
    /// 校对时间指令
    /// </summary>
    CheckTimeCmd = 0x8D,

    /// <summary>
    /// 正确应答指令
    /// </summary>
    OkCmd = 0x8F,

    /// <summary>
    /// 主机重启指令
    /// </summary>
    RebootCmd = 0xA0,
}

public enum DeviceSectorType : byte
{
    /// <summary>
    /// 防区未使用
    /// </summary>
    NotUsed = 0x00,

    /// <summary>
    /// 防区撤防
    /// </summary>
    Withdraw = 0x01,

    /// <summary>
    /// 防区布防
    /// </summary>
    Deploy = 0x02,

    /// <summary>
    /// 防区旁路
    /// </summary>
    Byway = 0x03,

    /// <summary>
    /// 防区报警
    /// </summary>
    Alarm = 0x04,

    /// <summary>
    /// 无线防区欠压
    /// </summary>
    Undervoltage = 0x05,

    /// <summary>
    /// 防区掉线(与主线总线脱离)
    /// </summary>
    OffBus = 0x06,

    /// <summary>
    /// 未准备就绪
    /// </summary>
    Unprepared = 0x07,
}

public enum DeviceDefenceState : byte
{
    /// <summary>
    /// 撤防状态
    /// </summary>
    Withdraw = 0x00,

    /// <summary>
    /// 外出布防(普通布防最常用)
    /// </summary>
    GoOut = 0x01,

    /// <summary>
    /// 即时布防(所有防区没有延时)
    /// </summary>
    Immediately = 0x02,

    /// <summary>
    /// 在家布防(留守布防有些防区可能是在旁路状态)
    /// </summary>
    Home = 0x04,

    /// <summary>
    /// 即时留守布防(有些防区可能旁路,但是没有旁路防区没有延时)
    /// </summary>
    HomeImmediately = 0x08,

    /// <summary>
    /// 部分防区布防部分防区撤防
    /// </summary>
    Part = 0x09
}