import struct
import string
import lzma

from .helpers import osuModes
from .helpers import osuMods
from .helpers import osuRanks
from .helpers import typeSerializer

from hashlib import md5 as _md5

def md5(str):
	return _md5(str.encode("ascii")).hexdigest().encode()

class Replay:
	mode			= osuModes.STANDARD						# Byte
	osu_version		= 20131216								# Int
	beatmap_hash	= b"d41d8cd98f00b204e9800998ecf8427e" 	# Byte[]
	player_name		= b"osu!"								# Byte[]
	score_hash		= b"d41d8cd98f00b204e9800998ecf8427e"	# Byte[]

	score_300s		= 0		# uShort
	score_100s		= 0		# uShort
	score_50s		= 0		# uShort
	score_gekis		= 0		# uShort
	score_katus		= 0		# uShort
	score_miss		= 0		# uShort
	score			= 0		# Int
	combo			= 0		# uShort
	perfect			= True	# Byte

	mods			= osuMods.NOMOD	# Int
	
	lifebar_graph	= b"0|1,"	# Byte[]
	timestamp		= 0		# Long

	replay_data		= b""	# Byte[]

	online_score_id	= 0		# Long

	def __init__(self, **kwargs):
		allowed_kwargs = {
			"mode": self.set_mode,
			"mods": self.set_mods,
			"osu_version": self.set_osu_version,
			"player_name": self.set_player_name,
			"replay_data": self.write
		}
		for k, v in kwargs.items():
			if k in allowed_kwargs.keys():
				allowed_kwargs[k](v) # Run callback func
	
	# Set validators -----------------------------------------------------------

	def set_mode(self, mode_id):
		if mode_id > 3 or mode_id < 0:
			raise Exception("Invalid mode")
		self.mode_id = mode_id
	
	def set_osu_version(self, osu_version):
		if type(osu_version) is not int:
			raise Exception("osu! version must be an int")
		self.osu_version = osu_version
	
	def set_beatmap_hash(self, md5_hash):
		if len(md5_hash) != 32 or len([x for x in md5_hash if x in string.hexdigits]) != 32:
			raise Exception("Invalid beatmap hash")
		self.beatmap_hash = md5_hash
	
	def set_player_name(self, player_name):
		self.player_name = player_name
	
	def set_score_hash(self, md5_hash):
		if type(md5_hash) is bytes:
			md5_hash = md5_hash.decode()
		if len(md5_hash) != 32 or len([x for x in md5_hash if x in string.hexdigits]) != 32:
			raise Exception("Invalid replay hash")
		self.score_hash = md5_hash.encode()
	
	def set_mods(self, mods):
		if mods < 0 or mods > (1 << 30) - 1:
			raise Exception("Mods are out of range")
	
	# --------------------------------------------------------------------------
	# Update variables ---------------------------------------------------------

	def update_perfect(self):
		m = [self.score_100s, self.score_50s, self.score_katus, self.score_miss]
		self.perfect = sum(m) == 0
	
	def update_score_hash(self):
		self.set_score_hash(
			md5("%d%s%s%s%d%d" % (
					self.combo,			"osu",		self.player_name,
					self.beatmap_hash,	self.score,	self.get_rank()
				))
			)
	
	def update(self):
		self.update_perfect()
		self.update_score_hash()
	
	# --------------------------------------------------------------------------
	# Get / Helpers ------------------------------------------------------------

	def get_hits(self):
		return sum([self.score_300s, self.score_100s, self.score_50s])

	def get_possible_hits(self):
		return self.get_hits() + self.score_miss

	def get_rank(self): # We dont give out F ranks around here
		hits = self.get_possible_hits()
		if hits == 0:
			raise Exception("Can not calculate rank without any score data")

		r300 = self.score_300s / hits
		r50 = self.score_50s / hits
		h = osuMods.any_enabled(self.mods, osuMods.HIDDEN | osuMods.FLASHLIGHT)

		if r300 == 1:
			return osuRanks.SSH if h else osuRanks.SS
		if r300 > .9 and r50 <= .01 and self.score_miss == 0:
			return osuRanks.SH if h else osuRanks.S
		if r300 > .8 and self.score_miss == 0 or r300 > .9:
			return osuRanks.A
		if r300 > .7 and self.score_miss == 0 or r300 > .8:
			return osuRanks.B
		if r300 > .6:
			return osuRanks.C
		return osuRanks.D
	
	# --------------------------------------------------------------------------
	# Write replay data --------------------------------------------------------

	def write(self, frame):
		if type(frame) is list:
			for _frame in frame: # (frames)
				self.write(_frame)
			return
		
		self.replay_data += bytes(frame)
	
	# --------------------------------------------------------------------------
	# IO replay data -----------------------------------------------------------

	def save(self, filename):
		self.update()

		compressed_replay = lzma.compress(self.replay_data + b"-12345|0|0|1337,", format = lzma.FORMAT_ALONE, filters = [
				{
					"id": lzma.FILTER_LZMA1,
					"preset": lzma.PRESET_DEFAULT,
					"dict_size": 1 << 21, # !important
				}
			])

		_player_name = bytes([len(self.player_name)]) + self.player_name
		_lifebar_graph = bytes([len(self.lifebar_graph)]) + self.lifebar_graph
		_compressed_replay = bytes([len(compressed_replay)]) + compressed_replay

		with open(filename, "wb") as f:
			# Yes... Please never do this
			data = struct.pack(b"<BiBB32sB%dsBB32s6HiH?iB%dsQ%dsQ" % (len(_player_name), len(_lifebar_graph), len(_compressed_replay)),
					self.mode,
					self.osu_version,
					11, len(self.beatmap_hash), self.beatmap_hash,
					11, _player_name,
					11, len(self.score_hash), self.score_hash,
					self.score_300s, self.score_100s, self.score_50s, self.score_gekis, self.score_katus, self.score_miss,
					self.score,
					self.combo,
					self.perfect,
					self.mods,
					11, _lifebar_graph,
					self.timestamp,
					_compressed_replay,
					self.online_score_id
				)
			f.write(data)