from __future__ import division

import struct

from minecraft.networking.types.basic import (
    Type, Byte, Short, Integer, Long, Float, Double,
    ShortPrefixedByteArray, Boolean, VarInt, TrailingByteArray
)
from minecraft.networking.types.utility import Vector


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


class Slot(Type):
    def __init__(self, present, item_id, item_count, nbt):
        self.present = present
        self.item_id = item_id
        self.item_count = item_count
        self.nbt = nbt

    def __str__(self):
        return str(self.__dict__)
    def __repr__(self):
        return 'Slot(present={}, item_id={}, item_count={}, nbt={}'.format(
            self.present, self.item_id, self.item_count, self.nbt)

    @staticmethod
    def read(file_object):
        present = Boolean.read(file_object)
        item_id = VarInt.read(file_object) if present else None
        item_count = Byte.read(file_object) if present else None
        nbt = TrailingByteArray.read(file_object) if present else None
        return Slot(present, item_id, item_count, nbt)

    @staticmethod
    def send(value, socket):
        Boolean.send(value.present, socket)
        VarInt.send(value.item_id, socket)
        Byte.send(value.item_count, socket)
        TrailingByteArray.send(value.nbt, socket)