from __future__ import division

from minecraft.networking.types.basic import Type, Byte, Short, Integer, Long, Float, Double, ShortPrefixedByteArray

import struct

from minecraft.networking.types.utility import Vector
from minecraft.networking.types.basic import Type, Byte, Short, Integer, Long, Float, Double, ShortPrefixedByteArray


class IntegerPrefixedByteArray(Type):
    @staticmethod
    def read(file_object):
        length = Integer.read(file_object)
        return struct.unpack(str(length) + "s", file_object.read(length))[0]

    @staticmethod
    def send(value, socket):
        Integer.send(len(value), socket)
        socket.send(value)

TAG_End = 0
TAG_Byte = 1
TAG_Short = 2
TAG_Int = 3
TAG_Long = 4
TAG_Float = 5
TAG_Double = 6
TAG_Byte_Array = 7
TAG_String = 8
TAG_List = 9
TAG_Compound = 10
TAG_Int_Array = 11
TAG_Long_Array = 12

class Nbt(Type):
    @staticmethod
    def read(file_object):
        type_id = Byte.read(file_object)
        if type_id != TAG_Compound:
            raise Exception("Invalid NBT header")
        name = ShortPrefixedByteArray.read(file_object).decode('utf-8')
        a = Nbt.decode_tag(file_object, TAG_Compound)
        a['_name'] = name
        return a

    @staticmethod
    def decode_tag(file_object, type_id):
        if type_id == TAG_Byte:
            return Byte.read(file_object)
        elif type_id == TAG_Short:
            return Short.read(file_object)
        elif type_id == TAG_Int:
            return Integer.read(file_object)
        elif type_id == TAG_Long:
            return Long.read(file_object)
        elif type_id == TAG_Float:
            return Float.read(file_object)
        elif type_id == TAG_Double:
            return Double.read(file_object)
        elif type_id == TAG_Byte_Array:
            return IntegerPrefixedByteArray.read(file_object).decode('utf-8')
        elif type_id == TAG_String:
            return ShortPrefixedByteArray.read(file_object)
        elif type_id == TAG_List:
            list_type_id = Byte.read(file_object)
            size = Integer.read(file_object)
            a = []
            for i in range(size):
                a.append(Nbt.decode_tag(file_object, list_type_id))
            return a
        elif type_id == TAG_Compound:
            c = { }
            child_type_id = Byte.read(file_object)
            while child_type_id != TAG_End:
                child_name = ShortPrefixedByteArray.read(file_object).decode('utf-8')
                c[child_name] = Nbt.decode_tag(file_object, child_type_id)
                child_type_id = Byte.read(file_object)
            return c
        elif type_id == TAG_Int_Array:
            size = Integer.read(file_object)
            a = []
            for i in range(size):
                a.append(Integer.read(file_object))
            return a
        elif type_id == TAG_Long_Array:
            size = Integer.read(file_object)
            a = []
            for i in range(size):
                a.append(Long.read(file_object))
            return a
        else:
            raise Exception("Invalid NBT tag type")

    @staticmethod
    def send(value, socket):
        # TODO
        pass