import ldap3

MAXENTRIES = 1000000
OBJECTCLASSES = ['top', 'person', 'organizationalPerson', 'inetOrgPerson', 'posixAccount', 'shadowAccount']
USERATTRIBUTES = ['cn' , 'sn', 'givenName', 'uid', 'uidNumber' , 'gidNumber', 'homeDirectory', 'loginShell', 'gecos' , 'shadowLastChange', 'shadowMax', 'userPassword', 'mail', 'description']

class ldapbind():
    def __init__(self, ldap_host: str, admin_user: str, admin_pass: str, base: str):
        self.ldap_host = ldap_host
        self.admin_user = admin_user
        self.admin_pass= admin_pass
        self.base = base

        ldapserver = ldap3.Server(self.ldap_host,use_ssl=True)
        self.conn = ldap3.Connection(ldapserver, admin_user, admin_pass, auto_bind=True)

class logbranch():
    def __init__(self, ldap_server: ldapbind, log_server: ldapbind):

        self.ldap_server = ldap_server
        self.log_server = log_server

        self.base = self.ldap_server.base
        self.logbase = self.log_server.base
        self.logconnection = self.log_server.conn

        self.ldapconnection = self.ldap_server.conn
        self.logconnection = self.log_server.conn

        # How many changes we applied to the LDAP server
        self.loaded = self.getloaded()

        # How many changes are recoreded in total
        self.total = self.gettotal()

    def gettotal(self)->int:
        self.logconnection.search(search_base=f'uid=total,{self.logbase}',search_filter='(objectClass=person)', attributes=['uidNumber'])
        response = self.logconnection.response
        if response == []:
            response = 0
        return int(response['attributes']['uidNumber'])

    def settotal(self, newvalue: int):
        newvalue = int(newvalue)

        # Check if total record already present
        self.logconnection.search(search_base=f'uid=total,{self.logbase}',search_filter='(objectClass=person)', attributes=['uidNumber'])
        response = self.logconnection.response
 
        if response == []:
            return self.logconnection.add(f'uid=total,{self.logbase}', OBJECTCLASSES, { 'uid' : 'total', 'uidNumber' : 0 })

        return self.logconnection.modify(f'uid=total,{self.logbase}', {'uidNumber' : (ldap3.MODIFY_REPLACE, [newvalue])})

    def getloaded(self):
        self.connection.search(search_base=f'uid=loaded,{self.logbase}',search_filter='(objectClass=person)', attributes=['uidNumber'])
        response = self.logconnection.response
        if response == []:
            response = 0
        return int(self.connection.response['attributes']['uidNumber'])

    def setloaded(self, newvalue: int):
        newvalue = int(newvalue)

        # Check if loaded record already present
        self.logconnection.search(search_base=f'uid=loaded,{self.logbase}',search_filter='(objectClass=person)', attributes=['uidNumber'])
        response = self.logconnection.response
 
        if response == []:
            return self.logconnection.add(f'uid=loaded,{self.logbase}', OBJECTCLASSES, { 'uid' : 'loaded', 'uidNumber' : 0 })

        return self.logconnection.modify(f'uid=loaded,{self.logbase}', {'uidNumber' : (ldap3.MODIFY_REPLACE, [newvalue])})

    def refreshtotal(self):
        self.settotal(self.findtotal())
        return self.gettotal()

    def findtotal(self):
        for entry in range(self.gettotal(), MAXENTRIES):
            self.logconnection.search(search_base=f'uid={entry},{self.logbase}',search_filter='(objectClass=person)', attributes=['uidNumber'])
            if self.logconnection.response == []:
                return entry - 1

    def applylogs(self):
        self.refreshtotal()

        loaded = int(self.getloaded()) + 1
        total = int(self.gettotal()) + 1

        for log_number in range(loaded, total):
            self.setlog(log_number)

        return total - loaded

    def applylog(self, log_number: int):
            log = self.getlog(log_number)
            return self.setlog(self, log)

    def getlog(self, log_number: int):
            self.logconnection.search(search_base=f'uid={log_number},{self.logbase}',search_filter = '(objectClass=person)', attributes = USERATTRIBUTES)
            return logconnection.response

    def setlog(self, log_number: int):
            log = self.getlog(log_number)

            attributes = log['attributes']['description']
            uid = attributes['uid']
            action = attributes['description']
            attributes['description'] = ''

            if action == 'ADD':
                self.ldapconnection.add(f'uid={uid},{self.base}', OBJECTCLASSES, attributes)
            elif action == 'DELETE':
                self.ldapconnection.delete(f'uid={uid},{self.base}')
            elif action == 'CHANGEPASS':
                self.ldapconnection.modify(f'uid={uid},{self.base}', {'userPassword': (MODIFY_REPLACE,attributes['userPassword'])})
            else:
                return f'Error: Unrecognized action in log entry: {action}'

            self.setloaded( self.getloaded() + 1 )
            return ldapconnection.response

class logtree():
    def __init__(self, ldap_server: ldapbind):
        self.ldap_server = ldap_server
        self.branches = []

    def add(self, log_server: logbranch):
        self.branches.append(log_server)

    def remove(self, log_server: logbranch):
        self.branches.remove(log_server)

    def sync(self):
        for branch in self.branches:
            branch.applylogs()