import urllib3
#requests doesnt work as it lacks key password checking
import chardet
import json


class labkeyInterface:

    def init(self,fname):
        #fname is a file with configuration
        try:
            f=open(fname)
        except OSError as e:
            print("Configuration error: OS error({}): {} {}".format(e.errno,fname, e.strerror))
            raise

        self.connectionConfig=json.load(f)
        self.initRemote()

    def initRemote(self):
        
        self.http=urllib3.PoolManager()

        if 'SSL' in self.connectionConfig:
            try:
                self.http = urllib3.PoolManager(\
                    cert_file=self.connectionConfig['SSL']['user'],\
                    cert_reqs='CERT_REQUIRED',\
                    key_file=self.connectionConfig['SSL']['key'],\
                    ca_certs=self.connectionConfig['SSL']['ca'])
            except KeyError:
                self.http = urllib3.PoolManager(\
                    cert_reqs='CERT_REQUIRED',\
                    ca_certs=self.connectionConfig['SSL']['ca'])


    #password=self.connectionConfig['SSL']['keyPwd'],\ doesnt work until 1.25
    def GetLabkeyUrl(self):
        return self.connectionConfig['host']+"/labkey"

    def GetLabkeyWebdavUrl(self):
        return self.GetLabkeyUrl()+"/_webdav"

    def getBasicAuth(self):
        user=self.connectionConfig['labkey']['user']
        pwd=self.connectionConfig['labkey']['password']
        return user+":"+pwd
        
        



    
    def get(self,url,binary=False):

        debug=False
        if debug:
            print("GET: {0}".format(url))
        headers=urllib3.util.make_headers(basic_auth=self.getBasicAuth())
        try:
            if not binary:
                return self.http.request('GET',url,headers=headers)
            else:
                return self.http.request('GET',url,headers=headers,preload_content=False)
        #f contains json as a return value
        #f contains json as a return value
        except urllib3.exceptions.HTTPError as e:
            print(e)
            #useful for querying code
            return e

    def head(self,url):

        debug=False
        if debug:
            print("HEAD: {0}".format(url))
        headers=urllib3.util.make_headers(basic_auth=self.getBasicAuth())
        
        try:
            return self.http.request('HEAD',url,headers=headers)
        except urllib3.exceptions.HTTPError as e:
            print(e)
            #usefule for querying code
            return e



    def post(self,url,data):

        debug=False
        headers=urllib3.util.make_headers(basic_auth=self.getBasicAuth())
        headers["Content-Type"]="application/json"
        #add csrf;also sets self.cookie
        headers["X-LABKEY-CSRF"]=self.getCSRF()
        headers["Cookie"]=self.cookie

        try:
            return self.http.request('POST',url,headers=headers,body=data)
        #f contains json as a return value
        except urllib3.exceptions.HTTPError as e:
            print(e)

    def mkcol(self,url):

        debug=False
        headers=urllib3.util.make_headers(basic_auth=self.getBasicAuth())
        #add csrf;also sets self.cookie
        headers["X-LABKEY-CSRF"]=self.getCSRF()
        headers["Cookie"]=self.cookie

        try:
            return self.http.request('MKCOL',url,headers=headers)
        #f contains json as a return value
        except urllib3.exceptions.HTTPError as e:
            print(e)



    def put(self,url,data):

        debug=False

        if debug:
            print("PUT: {}").format(url)

        headers=urllib3.util.make_headers(basic_auth=self.getBasicAuth())
        headers["Content-Type"]="application/octet-stream"
        #add csrf
        headers["X-LABKEY-CSRF"]=self.getCSRF()
        headers["Cookie"]=self.cookie

        try:
            return self.http.request('PUT',url,headers=headers,body=data)
        #f contains json as a return value
        except urllib3.exceptions.HTTPError as e:
            print(e)
      

            
    def getCSRF(self):
        url=self.GetLabkeyUrl()+'/login/whoAmI.view'
        try:
            response=self.get(url)
            encoding=chardet.detect(response.data)['encoding']
            #print(f'Got encoding: {encoding}')
            jsonData=json.loads(response.data.decode(encoding))
        except AttributeError:
            print('Failed')
            return None
        except UnicodeDecodeError:
            try:
               encoding='ASCII'
               jsonData=json.loads(response.data.decode(encoding))
            except UnicodeDecodeError:
               print(response.data)
               return None

        self.cookie=response.getheader('Set-Cookie')
        print('User: {} CSRF: {}'.format(jsonData['displayName'],jsonData['CSRF']))
        return jsonData["CSRF"]

    def getUserId(self):
        url=self.GetLabkeyUrl()+'/login/whoAmI.view'
        try:
            response=self.get(url)
            self.cookie=response.getheader('Set-Cookie')
            encoding=chardet.detect(response.data)['encoding']
            jsonData=json.loads(response.data.decode(encoding))
            return jsonData
        except AttributeError:
            return None