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

class MultiThreadDownload(threading.Thread):
    '''The Class for Multi-Thread Download'''
    '''Get from Internet and improved by Ghink Network Studio'''
    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'''
    '''
        self.__GamePath=GamePath
        self.__Version=Version
    '''
    def __init__(self,LauncherName="GMCLCore",LauncherVersion="A0.2.0"):
        '''The global variable set function'''
        ''':LauncherName The name of your launcher,default value is "GMCLCore".'''
        ''':LauncherVersion The version of your launcher,default value is the version of core.'''
        self.__LauncherName=LauncherName
        self.__LauncherVersion=LauncherVersion
        self.__UserAgent={'User-Agent':LauncherName+'/'+LauncherVersion+' ((GMCL Core Alpha 0.2.0;Alpha))'}
    def SearchFile(self,Path,Tag,Num=1):
        '''The function which was used to search files'''
        ''':Path The root path you want to search'''
        ''':Tag The name keyword of the file you want to search'''
        ''':Num How much result you want to get,you should set as "all" if you want to return all result,the default value is 1'''
        List=[]
        i=0
        for root,dirs,files in os.walk(Path,topdown=True):
            if Tag in files:
                i+=1
                List.append(root+'\\'+Tag)
                if(i==Num):
                    break
            else:
                pass
        return List
    def GetUUID(self,Account="Steve"):
        '''The function which was used to generate UUID'''
        ''':Account Your account,the default value is "Steve"'''
        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 GetJavaPath(self,Num=1):
        '''The function which was used to search java'''
        ''':Num How much result you want to get,you should set as "all" if you want to return all result,the default value is 1'''
        if(platform.system()=="Windows"):
            return self.SearchFile('C:\\','javaw.exe',Num)
        elif(platform.system()=="Linux"):
            return self.SearchFile('\\','java',Num)
        else:
            return self.SearchFile('\\','java',Num)
    def SetAccount(self,Account="Steve",Password=""):
        '''The function which was used to set game account data'''
        ''':Account Your account,the default value is "Steve"'''
        ''':Password Your password'''
        if(self.__AuthWay=="online"):
            if(Account.count("@")==1):
                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."
            else:
                return "Error:Wrong Account."
        elif(self.__AuthWay=="offline"):
            if(Account.count("@")==1):
                return "Error:Wrong Account."
            else:
                self.__ID=Account
                self.__UUID=self.GetUUID(Account)
                self.__Token=""
        else:
            pass
    def SetAuthWay(self,AuthWay):
        '''The auth way set function'''
        ''':AuthWay Your auth way,must be "offline" or "online"'''
        if(AuthWay=="offline"):
            self.__AuthWay="offline"
        elif(AuthWay=="online"):
            self.__AuthWay="online"
        else:
            return "Error:Wrong Auth Way."
    def SetRecomMem(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 SetRecomMem(self):
        self.__Memory = float(psutil.virtual_memory().free / 1024 ** 3) * 0.8
    def SetJavaPath(self,path):
        if(path==None):
            return "Error:Wrong local address for java."
        else:
            if(os.path.exists(path)):
                self.__JAVA=path
            else:
                return "Error:Wrong local address for java."
    def SetGameMem(self,Memory):
        try:
            self.__Memory=float(Memory)
        except:
            return "Error:Wrong parameter for game memory."
    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()