#!/usr/bin/python2

#why does the bang not work?
import urllib2, json, os, sys
print "LinuxMint4Ever's EarlyLauncher version BETA 2.4"

#globally used variables
config = []
offlineData = []
main = (__name__ == "__main__")

#When run directly, make sure that we are in the correct directory.
if main:
    if os.path.isfile(os.path.join(os.getcwd(), "earlylauncher.py")):
        pass
    else:
        print "Error: Not running from the EarlyLauncher Directory"
        sys.exit(1)

def readFile(fileName):
    fileReader = open(fileName, "r")
    fileContents = fileReader.read()
    fileReader.close()
    return fileContents

def loadConfig(configFile = "config.txt"):
    global config
    #read the config file and if run directly, do error handling as well
    if main:
        try:
            configRaw=readFile(configFile).split("\n")
        except:
            print "Error: Could not read config file."
            sys.exit(1)
    else:
        configRaw=readFile(configFile).split("\n")
        #TODO: Raise an exception in case of an error
    #put config options and values in a two dimensional list
    for i in range(len(configRaw)):
        #ignore empty lines and comments
        if configRaw[i] == "":
            pass
        elif configRaw[i][0] == '#':
            pass
        else:
            config = config + [configRaw[i].split("=")]

def loadOfflineData(offlineDataFile = "offline.txt"):
    global offlineData
    #read the config file and if run directly, do error handling as well
    if main:
        try:
            dataRaw=readFile(offlineDataFile).split("\n")
        except:
            print "Error: Could not read offline data file."
            sys.exit(1)
    else:
        #TODO: Raise an exception in case of an error
        dataRaw=readFile(offlineDataFile).split("\n")
    #put config options and values in a two dimensional list
    for i in range(len(dataRaw)):
        #ignore empty lines and comments
        if dataRaw[i] == "":
            pass
        elif dataRaw[i][0] == '#':
            pass
        else:
            offlineData = offlineData + [dataRaw[i].split("=")]

def getDataOff2DArray(key, array):
    for i in range(len(array)):
        if array[i][0]==key:
            return array[i][1]

def getToken(username, password):
    data = {
            "agent": {
                    "name": "Minecraft",
                    "version": 1
            },
            "username": username,
            "password": password
    }
    try:
        request = urllib2.Request(url='https://authserver.mojang.com/authenticate', data=json.dumps(data).encode(), headers={"Content-Type": "application/json"})
        answer = json.loads(urllib2.urlopen(request).read().decode())
    except urllib2.HTTPError:
        if main:
            print "Invalid user information! (or something went wrong)"
            sys.exit(1)
        else:
            #TODO: raise an exception
            return False, False, False
    except urllib2.URLError:
        if main:
            print "Authentication server not reachable. Re-launching last user session."
            loadOfflineData()
            return getDataOff2DArray("access_token", offlineData), getDataOff2DArray("profile_id", offlineData), getDataOff2DArray("username", offlineData)
        else:
            #TODO: raise an exception
            return False, False, False

    username     = answer['selectedProfile']['name']
    access_token = answer['accessToken']
    profile_id   = answer['selectedProfile']['id']


    return access_token, profile_id, username

def deRelative(cwd, path):
    return os.path.join(cwd, path)

def run(java_executable, ram, alignTo, libs, username, gameDir, assets, uuid, accessToken):
    cwd = os.getcwd()
    os.chdir(gameDir)
    exitCode = os.system(deRelative(cwd, java_executable)+" -Xmx"+ram+alignTo+" -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M -Djava.library.path="+os.path.join(deRelative(cwd, libs), "natives")+" -cp "+os.path.join(deRelative(cwd, libs),"jar")+os.sep+(":"+os.path.join(deRelative(cwd,libs),"jar")+os.sep).join(os.listdir(os.path.join(deRelative(cwd, libs),"jar")))+" net.minecraft.launchwrapper.Launch --username "+username+" --version 1.7.10-Forge10.13.4.1614-1.7.10 --gameDir "+deRelative(cwd,gameDir)+" --assetsDir "+deRelative(cwd, assets)+" --assetIndex 1.7.10 --uuid "+str(uuid)+" --accessToken "+accessToken+" --userProperties {} --userType mojang --tweakClass cpw.mods.fml.common.launcher.FMLTweaker")
    os.chdir(cwd)
    return exitCode

if main:
    loadConfig()
    ram = getDataOff2DArray("ram", config)
    alignTo = getDataOff2DArray("alignTo", config)
    assets = getDataOff2DArray("assets", config)
    gameDir = getDataOff2DArray("gameDir", config)
    libs = getDataOff2DArray("libs", config)
    java_executable = getDataOff2DArray("java_executable", config)
    #TODO: allow the use of sys.argv to override config

    login=raw_input("eMail or username: ")
    pw=raw_input("Password: ")
    accessToken, uuid, username = getToken(str(login), str(pw))
    try:
        offlineDataFile = open("offline.txt", "w")
        offlineDataFile.write("username="+username+"\naccess_token="+accessToken+"\nprofile_id="+uuid)
        offlineDataFile.close()
    except:
        print "Error creating offline login data. Proceeding with launch anyways."
    sys.exit(run(java_executable, ram, alignTo, libs, username, gameDir, assets, uuid, accessToken))