#------------------#
import os,requests,json,time,sys,psutil,string,platform,glob,getpass,shutil,hashlib,random,subprocess,math,zipfile,threading
#------------------#

class MultiThreadDownload(threading.Thread):
    '''class for Multi-Thread Download'''
    def __init__(self,url,startpos,endpos,f):
        super(MultiThreadDownload,self).__init__()
        self.url = url
        self.startpos = startpos
        self.endpos = endpos
        self.fd = f

    def download(self):
        headers = {"Range":"bytes=%s-%s"%(self.startpos,self.endpos)}
        res = requests.get(self.url,headers=headers)
        self.fd.seek(self.startpos)
        self.fd.write(res.content)

    def run(self):
        self.download()

class GMCLCore(object):
    '''The Main Class of the Launcher Core'''
    '''AuthWay="offline",Account="Steve",Password="",GamePath=".minecraft",Memory="1GB",Version="",Java=""'''
    '''
        self.GetAuthWay(AuthWay)
        self.GetAccoutn(Account)
        self.__Password=Password
        self.__GamePath=GamePath
        self.GetMemory(Memory)
        self.__Version=Version
        self.__Java=Java
    '''
    def __init__(self,LauncherName="GMCLCore",LauncherVersion="A0.2.0"):
        self.__LauncherName=LauncherName
        self.__LauncherVersion=LauncherVersion
        self.__UserAgent={'User-Agent':LauncherName+'/'+LauncherVersion+' ((GMCL Core Alpha 0.2.0;Alpha))'}
    def GetAuthWay(self,AuthWay):
        if(AuthWay=="offline"):
            self.__AuthWay="offline"
        elif(AuthWay=="online"):
            self.__AuthWay="online"
        else:
            return "Error:Wrong Auth Way."
    def GetMemory(self,Memory):
        if(Memory.count("B")>1 or Memory.count("b")>1):
            return "Error:Wrong Memory Unit"
        else:
            if(Memory.count("GB")==1):
                self.__Memory=Memory.replace("GB","")
            elif(Memory.count("MB")==1):
                self.__Memory=str(float(Memory.replace("MB",""))/1024)
            elif(Memory.count("Gb")==1):
                self.__Memory=str(float(Memory.replace("Gb",""))/8)
            elif(Memory.count("Mb")==1):
                self.__Memory=str(float(Memory.replace("Mb",""))/8/1024)
            else:
                return "Error:Wrong Memory Unit."
    def GetAccount(self,Account):
        if(self.__AuthWay=="online"):
            if(Account.count("@")==1):
                self.OnlineAuth(Account,self._Password)
            else:
                return "Error:Wrong Account."
        elif(self.__AuthWay=="offline"):
            if(Account.count("@")==1):
                return "Error:Wrong Account."
            else:
                self.OfflineAuth(Account)
        else:
            pass
    def GetUUID(self,Account):
        if(self.__AuthWay=="offline"):
            result="OfflinePlayer:"+Account
            md5=hashlib.md5()
            md5.update(result.encode(encoding='utf-8'))
            return md5.hexdigest()
        else:
            return "Error:Wrong Auth Way."
    def OnlineAuth(self,Account,Password):
        if(json.loads(requests.get("https://authserver.mojang.com/",headers=self.__UserAgent).text)['status']=="OK"):
            result=json.loads(requests.post("https://authserver.mojang.com/authenticate",'{"agent":{"name":"Minecraft","Version":1},"username":"'+Account+'","password":"'+Password+'"}',headers=self.__UserAgent).text)
            self.__Token=result['accessToken']
            self.__UUID=result['selectedProfile']['id']
            self.__ID=result['selectedProfile']['name']
        else:
            return "Error:Fail to request Mojang\'s Auth Server."
    def OfflineAuth(self,Account):
        self.__ID=Account
        self.__UUID=self.GetUUID(Account)
        self.__Token=""
    def GetJavaPath(self):
        if(platform.system()=="Windows"):
            path="C:/"
        elif(platform.system()=="Linux"):
            path="/"
        else:
            path="/"
        i=0
        for ipath in os.listdir(Path):
            FullDir=os.path.join(path,ipath)
            if(os.path.isfile(FullDir)):
                if("javaw.exe" in os.path.split(FullDir)[1]):
                    return FullDir
                    i+=1
            if(i==1):
                break
    def SetJavaPath(self,path):
        if(path==None):
            return "Error:Wrong local address for java."
        else:
            self.__JAVA=path
    def Download(self,DownloadFrom,DownloadTo,ThreadNum=3):
        if(DownloadFrom=="" or DownloadTo==""):
            return "Error:Wrong online address or local address for download."
        else:
            url = DownloadFrom
            filename = DownloadTo
            filesize = int(requests.head(url).headers['Content-Length'])

            threadnum = ThreadNum
            threading.BoundedSemaphore(threadnum)
            step = filesize // threadnum
            mtd_list = []
            start = 0
            end = -1

            tempf = open(filename,'w')
            tempf.close()
            with open(filename,'rb+') as  f:
                fileno = f.fileno()
                while end < filesize -1:
                    start = end +1
                    end = start + step -1
                    if end > filesize:
                        end = filesize
                    dup = os.dup(fileno)
                    fd = os.fdopen(dup,'rb+',-1)
                    t = MultiThreadDownload(url,start,end,fd)
                    t.start()
                    mtd_list.append(t)

                for i in  mtd_list:
                    i.join()

launcher=GMCLCore("AAA","V250")
launcher.Download("http://mirrors.163.com/centos/8.2.2004/isos/x86_64/CentOS-8.2.2004-x86_64-boot.iso","aa.iso")