from __future__ import print_function

# specialized Xrn class for PlanetLab
import re
from sfa.util.xrn import Xrn, get_authority

# temporary helper functions to use this module instead of namespace
def hostname_to_hrn (auth, login_base, hostname):
    return PlXrn(auth=auth+'.'+login_base,hostname=hostname).get_hrn()
def hostname_to_urn(auth, login_base, hostname):
    return PlXrn(auth=auth+'.'+login_base,hostname=hostname).get_urn()
def slicename_to_hrn (auth_hrn, slicename):
    return PlXrn(auth=auth_hrn,slicename=slicename).get_hrn()
def email_to_hrn (auth_hrn, email):
    return PlXrn(auth=auth_hrn, email=email).get_hrn()
def hrn_to_pl_slicename (hrn):
    return PlXrn(xrn=hrn,type='slice').pl_slicename()
# removed-dangerous - was used for non-slice objects
#def hrn_to_pl_login_base (hrn):
#    return PlXrn(xrn=hrn,type='slice').pl_login_base()
def hrn_to_pl_authname (hrn):
    return PlXrn(xrn=hrn,type='any').pl_authname()
def xrn_to_hostname(hrn):
    return Xrn.unescape(PlXrn(xrn=hrn, type='node').get_leaf())

# helpers to handle external objects created via fedaration 
def top_auth (hrn):
    return hrn.split('.')[0]

def hash_loginbase(site_hrn):
    if len(site_hrn) <= 12:
        return site_hrn.replace('.','8').replace('_', '8')
    ratio = float(12) / len(site_hrn)
    auths_tab = site_hrn.split('.')
    auths_tab2 = []
    for auth in auths_tab:

        auth = auth.replace('_', '8')
        auth2 = auth[:int(len(auth)*ratio)]
        auths_tab2.append(auth2)
    return '8'.join(auths_tab2)

class PlXrn (Xrn):

    @staticmethod 
    def site_hrn (auth, login_base):
        return '.'.join([auth,login_base])

    def __init__ (self, auth=None, hostname=None, slicename=None, email=None, interface=None, **kwargs):
        #def hostname_to_hrn(auth_hrn, login_base, hostname):
        if hostname is not None:
            self.type='node'
            # keep only the first part of the DNS name
            #self.hrn='.'.join( [auth,hostname.split(".")[0] ] )
            # escape the '.' in the hostname
            self.hrn='.'.join( [auth,Xrn.escape(hostname)] )
            self.hrn_to_urn()
        #def slicename_to_hrn(auth_hrn, slicename):
        elif slicename is not None:
            self.type='slice'
            # split at the first _
            parts = slicename.split("_",1)
            self.hrn = ".".join([auth] + parts )
            self.hrn_to_urn()
        #def email_to_hrn(auth_hrn, email):
        elif email is not None:
            self.type='person'
            # keep only the part before '@' and replace special chars into _
            self.hrn='.'.join([auth,email.split('@')[0].replace(".", "_").replace("+", "_")])
            self.hrn_to_urn()
        elif interface is not None:
            self.type = 'interface'
            self.hrn = auth + '.' + interface
            self.hrn_to_urn()
        else:
            Xrn.__init__ (self,**kwargs)

    #def hrn_to_pl_slicename(hrn):
    def pl_slicename (self):
        self._normalize()
        leaf = self.leaf
        sliver_id_parts = leaf.split(':')
        name = sliver_id_parts[0]
        name = re.sub('[^a-zA-Z0-9_]', '', name)
        return self.pl_login_base() + '_' + name

    #def hrn_to_pl_authname(hrn):
    def pl_authname (self):
        self._normalize()
        return self.authority[-1]

    def interface_name(self):
        self._normalize()
        return self.leaf

    def pl_login_base (self):
        self._normalize()
        if self.type and self.type.startswith('authority'):
            base = self.leaf 
        else:
            base = self.authority[-1]
        
        # Fix up names of GENI Federates
        base = base.lower()
        base = re.sub('[\\\\]*[^a-zA-Z0-9]', '', base)

        return base

tests = [
    'inria.foo.x',
    'in.foo.x_y',
    'inria.foo.longer',
    'onelab.upmc.fit_demo',
    'onelab.upmc.fit_demo.some_other',
]

if __name__ == '__main__':
    for test in tests:
        print(("{} - hash_loginbase -> {}".format(test, hash_loginbase(test))))