from sfa.util.faults import *
from sfa.util.misc import *
from sfa.util.rspec import Rspec
from sfa.server.registry import Registries
from sfa.plc.nodes import *
from sfa.rspecs.aggregates.vini.utils import *
from sfa.rspecs.aggregates.vini.rspec import *
import sys

SFA_VINI_WHITELIST = '/etc/sfa/vini.whitelist'

"""
Copied from create_slice_aggregate() in sfa.plc.slices
"""
def create_slice_vini_aggregate(api, hrn, nodes):
    # Get the slice record from geni
    slice = {}
    registries = Registries(api)
    registry = registries[api.hrn]
    credential = api.getCredential()
    records = registry.resolve(credential, hrn)
    for record in records:
        if record.get_type() in ['slice']:
            slice = record.as_dict()
    if not slice:
        raise RecordNotFound(hrn)   

    # Make sure slice exists at plc, if it doesnt add it
    slicename = hrn_to_pl_slicename(hrn)
    slices = api.plshell.GetSlices(api.plauth, [slicename], ['node_ids'])
    if not slices:
        parts = slicename.split("_")
        login_base = parts[0]
        # if site doesnt exist add it
        sites = api.plshell.GetSites(api.plauth, [login_base])
        if not sites:
            authority = get_authority(hrn)
            site_records = registry.resolve(credential, authority)
            site_record = {}
            if not site_records:
                raise RecordNotFound(authority)
            site_record = site_records[0]
            site = site_record.as_dict()
                
            # add the site
            site.pop('site_id')
            site_id = api.plshell.AddSite(api.plauth, site)
        else:
            site = sites[0]
            
        slice_fields = {}
        slice_keys = ['name', 'url', 'description']
        for key in slice_keys:
            if key in slice and slice[key]:
                slice_fields[key] = slice[key]  
        api.plshell.AddSlice(api.plauth, slice_fields)
        slice = slice_fields
        slice['node_ids'] = 0
    else:
        slice = slices[0]    

    # get the list of valid slice users from the registry and make 
    # they are added to the slice 
    researchers = record.get('researcher', [])
    for researcher in researchers:
        person_record = {}
        person_records = registry.resolve(credential, researcher)
        for record in person_records:
            if record.get_type() in ['user']:
                person_record = record
        if not person_record:
            pass
        person_dict = person_record.as_dict()
        persons = api.plshell.GetPersons(api.plauth, [person_dict['email']],
                                         ['person_id', 'key_ids'])

        # Create the person record 
        if not persons:
            person_id=api.plshell.AddPerson(api.plauth, person_dict)

            # The line below enables the user account on the remote aggregate
            # soon after it is created.
            # without this the user key is not transfered to the slice
            # (as GetSlivers returns key of only enabled users),
            # which prevents the user from login to the slice.
            # We may do additional checks before enabling the user.

            api.plshell.UpdatePerson(api.plauth, person_id, {'enabled' : True})
            key_ids = []
        else:
            key_ids = persons[0]['key_ids']

        api.plshell.AddPersonToSlice(api.plauth, person_dict['email'],
                                     slicename)        

        # Get this users local keys
        keylist = api.plshell.GetKeys(api.plauth, key_ids, ['key'])
        keys = [key['key'] for key in keylist]

        # add keys that arent already there 
        for personkey in person_dict['keys']:
            if personkey not in keys:
                key = {'key_type': 'ssh', 'key': personkey}
                api.plshell.AddPersonKey(api.plauth, person_dict['email'], key)

    # find out where this slice is currently running
    nodelist = api.plshell.GetNodes(api.plauth, slice['node_ids'],
                                    ['hostname'])
    hostnames = [node['hostname'] for node in nodelist]

    # remove nodes not in rspec
    deleted_nodes = list(set(hostnames).difference(nodes))
    # add nodes from rspec
    added_nodes = list(set(nodes).difference(hostnames))

    """
    print >> sys.stderr, "Slice on nodes:"
    for n in hostnames:
        print >> sys.stderr, n
    print >> sys.stderr, "Wants nodes:"
    for n in nodes:
        print >> sys.stderr, n
    print >> sys.stderr, "Deleting nodes:"
    for n in deleted_nodes:
        print >> sys.stderr, n
    print >> sys.stderr, "Adding nodes:"
    for n in added_nodes:
        print >> sys.stderr, n
    """

    api.plshell.AddSliceToNodes(api.plauth, slicename, added_nodes) 
    api.plshell.DeleteSliceFromNodes(api.plauth, slicename, deleted_nodes)

    return 1

def get_rspec(api, hrn):
    topo = Topology(api)      
    if (hrn):
        slicename = hrn_to_pl_slicename(hrn)
        slice = get_slice(api, slicename)
        if slice:
            slice.hrn = hrn
            topo.nodeTopoFromSliceTags(slice)
        else:
            # call the default sfa.plc.nodes.get_rspec() method
            return Nodes(api).get_rspec(hrn)     

    return topo.toxml(hrn)



"""
Hook called via 'sfi.py create'
"""
def create_slice(api, hrn, xml):
    ### Check the whitelist
    ### It consists of lines of the form: <slice hrn> <bw>
    whitelist = {}
    f = open(SFA_VINI_WHITELIST)
    for line in f.readlines():
        (slice, maxbw) = line.split()
        whitelist[slice] = maxbw
        
    if hrn in whitelist:
        maxbw = whitelist[hrn]
    else:
        raise PermissionError("%s not in VINI whitelist" % hrn)
        
    rspec = Rspec(xml)
    topo = Topology(api)
    
    topo.nodeTopoFromRspec(rspec)

    # Check request against current allocations
    topo.verifyNodeTopo(hrn, topo, maxbw)
    
    nodes = topo.nodesInTopo()
    hostnames = []
    for node in nodes:
        hostnames.append(node.hostname)
    create_slice_vini_aggregate(api, hrn, hostnames)

    slicename = hrn_to_pl_slicename(hrn)
    slice = get_slice(api, slicename)
    if slice:
        topo.updateSliceTags(slice)    

    return True


def main():
    r = Rspec()
    r.parseFile(sys.argv[1])
    rspec = r.toDict()
    create_slice(None,'plc',rspec)
    
if __name__ == "__main__":
    main()