using UnityEngine;
using System.Collections;
using System;

public class Packet
{

    //create a new packet
    public Packet(byte[] data)
    {
        payload = data;
        position = 0;
    }

    public Packet(int size)
    {
        position = 0;
        payload = new byte[size];
    }

    //get the packet type
    public int getType()
    {
        //position = 0;
        return readByte();
    }

    public int size()
    {
        return payload.Length - 1;
    }

    public bool hasNext()
    {
        return position < size();
    }

    //read a byte from a packet buffer
    public int readSignedByte()
    {
        //convert the byte to unsigned
        return (payload[position++]);
    }

    //read a byte from a packet buffer
    public int readByte()
    {
        //convert the byte to unsigned
        position += 1;
        return (0x00000FF & payload[position - 1]);
    }

    //read a short from a pakcet buffer
    public int readShort()
    {
        int si0 = 0x00000FF & payload[position + 1];
        int si1 = 0x000FF00 & (payload[position + 0] << 8);
        position += 2;
        return si0 + si1;
    }

    public int readInt()
    {
        int si0 = 0x00000FF & payload[position + 3];
        int si1 = 0x000FF00 & (payload[position + 2] << 8);
        int si2 = 0x0FF0000 & (payload[position + 1] << 16);
        int si3 = (0x00000FF & payload[position]) << 24;
        position += 4;
        return si0 + si1 + si2 + si3;
    }

    public string readString()
    {
        int length = readByte();

        string data = "";

        for (int i = position; i < position + length; i++)
        {
            if (i < payload.Length)
            {
                data += (char)payload[i];
            }
        }

        position += length;

        return data;
    }

    public string readLongString()
    {
        int length = readInt();

        string data = "";

        for (int i = position; i < position + length; i++)
        {
            if (i < payload.Length)
            {
                data += (char)payload[i];
            }
        }

        position += length;

        return data;
    }

    public float readFloat()
    {
        int value = readInt();
        return (float)value / 100;
    }

    public float readFloat2()
    {
        float value = BitConverter.ToSingle(payload, position);
        position += 4;
        return value;
    }

    public int position;
    //the payload of the packet
    protected byte[] payload;
}