#!/usr/bin/env python3
import sys

oldexcepthook = sys.excepthook
def newexcepthook(type,value,traceback):
	oldexcepthook(type,value,traceback)
	input("Press ENTER to quit.")
sys.excepthook = newexcepthook

import os
p = os.path.join
pUp = os.path.dirname
s = False
if getattr(sys, 'frozen', False) and hasattr(sys, '_MEIPASS'):
	s = os.path.realpath(sys.executable)
else:
	s = os.path.realpath(__file__)
sp = pUp(s)

import subprocess
import json
import hashlib
import platform
p = os.path.join
os.environ["appdata"] = p(sp,"appdata")
java = p(sp,"java","bin","java.exe")
jvmArguments = ["-Xms256M","-Xmx800M"]
osName = platform.system().lower()
if osName == "darwin": osName = "macos"

def readJsonFile(file):
	fileh = open(file,"r")
	data = fileh.read()
	fileh.close()
	return json.loads(data)

def main():
	global version
	global name
	global osName
	if len(sys.argv) > 1:
		for arg in sys.argv[1:]:
			argSplit = arg.split("=",1)
			if len(argSplit) > 1:
				globals()[argSplit[0]] = argSplit[1]
	
	if not osName in ["windows","linux","macos"]:
		print("Warning, unsupported OS detected: " +osName)
		print("Needs to be either windows, linux or macos. Define it with osName=name in the commandline.")
		print("")
	if not "version" in globals(): version = input("Version ID: ")
	if not "name" in globals(): name = input("Player name: ")
	
	gamePath = p(os.environ["appdata"],".minecraft")
	versionPath = p(gamePath,"versions",version)
	libraryPath = p(gamePath,"libraries")
	nativesPath = p(gamePath,"natives")
	nativesOutPath = p(versionPath,"natives")
	assetsPath = p(gamePath,"assets")
	
	print("Extracting natives...")
	clientJson = readJsonFile(p(versionPath,version + ".json"))
	libraryList = ""
	for library in clientJson["libraries"]:
		if "artifact" in library["downloads"]:
			library["downloads"]["artifact"]["path"] = library["downloads"]["artifact"]["path"].replace("/",os.path.sep)
			libraryList += p(libraryPath,library["downloads"]["artifact"]["path"]) + ";"
		if "classifiers" in library["downloads"]:
			if "natives-" +osName in library["downloads"]["classifiers"]:
				native = library["downloads"]["classifiers"]["natives-" +osName]
				native["path"] = native["path"].replace("/",os.path.sep)
				if not os.path.isdir(nativesOutPath): os.makedirs(nativesOutPath)
				subprocess.run(["7z","x",p(nativesPath,native["path"]),"-o" +nativesOutPath,"-aos"],check=True,stdout=subprocess.DEVNULL)
	
	libraryList += p(versionPath,version + ".jar")
	#print(libraryList)
	
	launcherVariables = {}
	launcherVariables["auth_player_name"] = name
	launcherVariables["version_name"] = version
	launcherVariables["game_directory"] = gamePath
	launcherVariables["assets_root"] = assetsPath
	launcherVariables["assets_index_name"] = clientJson["assets"]
	launcherVariables["auth_access_token"] = "-"
	launcherVariables["auth_uuid"] = hashlib.md5(name.encode('utf-8')).hexdigest()
	launcherVariables["user_type"] = "offline"
	launcherVariables["version_type"] = clientJson["type"]
	
	args = jvmArguments
	args.append("-Djava.library.path=" +nativesOutPath)
	args.append("-cp")
	args.append(libraryList)
	args.append(clientJson["mainClass"])
	
	if "arguments" in clientJson:
		for arg in clientJson["arguments"]["game"]:
			if type(arg) != str: continue
			for var in launcherVariables:
				arg = arg.replace("${" +var+ "}",launcherVariables[var])
			args.append(arg)
	elif "minecraftArguments" in clientJson:
		margs = clientJson["minecraftArguments"].replace('"',"").split(" ")
		for arg in margs:
			if type(arg) != str: continue
			for var in launcherVariables:
				arg = arg.replace("${" +var+ "}",launcherVariables[var])
			args.append(arg)
	
	print("Launching Minecraft...")
	subprocess.call([java] + args)


main()