using System;
using System.IO;
using UnityEngine;

public class BinaryMessage : IDisposable
{
    private readonly MemoryStream _stream;
    private readonly BinaryWriter _writer;

    public BinaryMessage(int sysId, int cmdId)
    {
        _stream = new MemoryStream();
        _writer = new BinaryWriter(_stream);
        _writer.Write((byte)sysId);
        _writer.Write((byte)cmdId);
    }

    public void Dispose()
    {
        _writer.Close();
        _stream.Dispose();
    }

    public void Send()
    {
        BinaryMessageHandle.PacketSend(_stream, _writer);
        Dispose();
    }
    
    // 注：Lua只有个number，没得Byte，Short之分，所以Number类只能用函数名区分
    public void WriteByte(byte data)
    {
        _writer.Write(data);
    }

    public void WriteShort(short data)
    {
        _writer.Write(data);
    }

    public void WriteInt(int data)
    {
        _writer.Write(data);
    }

    public void WriteLong(long data)
    {
        _writer.Write(data);
    }

    public void WriteString(string data)
    {
        var bytes = System.Text.Encoding.UTF8.GetBytes(data);
        _writer.Write((short)bytes.Length);
        _writer.Write(bytes);
        _writer.Write((byte)0);
    }
}