import os
import pickle
from PyQt4.QtCore import *
from PyQt4.QtGui import *

from lxml import etree
from sfa.util.xrn import hrn_to_urn, urn_to_hrn
from sfa.storage.record import SfaRecord, SliceRecord, AuthorityRecord, UserRecord
from sfa.rspecs.rspec import RSpec
from sface.config import config

class SfiData:
    def __init__(self):
        pass

    def getAuthorityHrns(self, type=None):
        names = []
        if os.path.exists(config.getAuthorityListFile()):
            xml = open(config.getAuthorityListFile()).read()
            tree = etree.fromstring(xml)
            records = tree.xpath("//recordlist/record")

            for record in records:
                recType = record.attrib.get("type", None)
                recHrn = record.attrib.get("hrn", None)
                if (type==None) or (type==recType):
                    names.append(recHrn)

        return names

    def getSliceRecord(self):
        rec_file = config.getSliceRecordFile()
        if os.path.exists(rec_file):
            xml = open(rec_file).read()
            rec = SliceRecord()
            rec.load_from_string(xml)
            return rec
        return None

    def getUserRecord(self):
        rec_file = config.getUserRecordFile()
        if os.path.exists(rec_file):
            xml = open(rec_file).read()
            rec = UserRecord()
            rec.load_from_string(xml)
            return rec
        return None

    def getUserSliceHrns(self):
        rec = self.getUserRecord()
        if rec:
            slices = rec.get_field("slices")
            if (type(slices)!=list) or (len(slices)<1):
                return []

            # get_field("slices") is returning [{"text": name}, {"text": name}, ...]
            if (type(slices[0])==dict):
                if "text" in slices[0]:
                    slices = [x["text"] for x in slices]

            return slices

        return []

    def purgeNonSliceResources(self, rspec):
        # This can probably go away once the new slice manager is fully
        # deployed.
        networks = rspec.get_networks()
        for network in networks:
            all_nodes = rspec.get_nodes(network)
            sliver_nodes = rspec.get_nodes_with_slivers(network)
            available_nodes = [ node for node in all_nodes if node not in sliver_nodes ]

            for node in available_nodes:
                node_elem = rspec.get_node_element(node, network)
                parent = node_elem.xpath("..")[0]
                parent.remove(node_elem)

    def getSliceRSpec(self):
        rspec_file = config.getSliceRSpecFile()
        if os.path.exists(rspec_file):
            xml = open(rspec_file).read()
            rspec = RSpec(rspec=xml) #rspec = parse_rspec(xml)

            #self.purgeNonSliceResources(rspec)

            return rspec
        return None

    def getResourcesRSpec(self):
        rspec_file = config.getResourcesRSpecFile()
        if os.path.exists(rspec_file):
            xml = open(rspec_file).read()
            rspec = RSpec(rspec=xml) #rspec= parse_rspec(xml)
            return rspec
        return None

    def getSliverStatus(self, slice=None):
        if not slice:
            slice = config.getSlice()

        filename = config.fullpath(slice+".sliverstatus")

        if os.path.exists(filename):
            data = open(filename).read()
            return pickle.loads(data)

        return None

    def getSliceMgrVersion(self):
        filename = config.fullpath("slicemgr.version")

        if os.path.exists(filename):
            data = open(filename).read()
            return pickle.loads(data)

        return None