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

from sfa.util.rspecHelper import RSpec
from sface.sfahelper import *
from sface.sficonfig import config
from sface.sfiprocess import SfiProcess
from sface.screens.sfascreen import SfaScreen


class SliceWidget(QWidget):
    def __init__(self, parent=None):
        QWidget.__init__(self, parent)

        self.nodeView = QTreeView(self)
        self.nodeView.setRootIsDecorated(False)
        self.nodeView.setAlternatingRowColors(True)
        self.nodeView.setSizePolicy(QSizePolicy.Expanding, QSizePolicy.Expanding)

        self.nodeModel = QStandardItemModel(0, 3, self)
        self.nodeModel.setHeaderData(0, Qt.Horizontal, QString("Testbed"))
        self.nodeModel.setHeaderData(1, Qt.Horizontal, QString("Hostname"))
        self.nodeModel.setHeaderData(2, Qt.Horizontal, QString("IsIn"))

        self.nodeView.setModel(self.nodeModel)

        refresh = QLabel("<a href='refresh'>Refresh</a>", self)
        refresh.setScaledContents(False)
        slicename = QLabel ("Slice : %s"%(config.getSlice() or "None"),self)
        slicename.setScaledContents(False)

        self.status = QLabel("")

        hlayout = QHBoxLayout()
        hlayout.addWidget(slicename)
        hlayout.addStretch()
        hlayout.addWidget(refresh)

        layout = QVBoxLayout()
        layout.addLayout(hlayout)
        layout.addWidget(self.nodeView)
        layout.addWidget(self.status)
        self.setLayout(layout)
        self.setSizePolicy(QSizePolicy.Expanding, QSizePolicy.Expanding)

        self.connect(refresh, SIGNAL('linkActivated(QString)'), self.refresh)

        rspec_file = os.path.expanduser("~/.sfi/%s.rspec" % config.getSlice())
        if os.path.exists(rspec_file):
            self.updateView()
        
    def readSliceRSpec(self):
        rspec_file = os.path.expanduser("~/.sfi/%s.rspec" % config.getSlice())
        xml = open(rspec_file).read()
        return xml

    def refresh(self, link=None):
        if not config.getSlice():
            self.status.setText("Slice not set yet!")
            return

        self.process = SfiProcess()
        outfile = self.process.getRSpecFromSM()
        self.status.setText("Updating slice data. This may take some time...")
        
        self.connect(self.process, SIGNAL('finished()'), self.refreshFinished)

    def refreshFinished(self):
        del self.process
        self.status.setText("Slice data updated.")
        self.updateView()

    def updateView(self):
        rspec_string = self.readSliceRSpec()
        networks = rspec_get_networks(rspec_string)
        networks.reverse()

        for network in networks:
#            nodes = self.rspec_get_sliver_nodes_from_network(rspec_string, network)
#            for node in nodes: self.addNode(network, node, True)
#            nodes = self.rspec_get_other_nodes_from_network(rspec_string, network)
#            for node in nodes: self.addNode(network, node, False)
            # hacky - i'm just gettin used to this xml navigation stuff
            xml_nodes = rspec_get_xml_nodes_from_network(rspec_string, network)
            from lxml import etree
            # addNode inserts before, so let's start with the ones that are not in
            for xml_node in xml_nodes:
                if not xml_node.xpath('sliver'): 
                    self.addNode(network, xml_node.xpath('hostname/text()')[0],False)
            for xml_node in xml_nodes:
                if xml_node.xpath('sliver'): 
                    self.addNode(network, xml_node.xpath('hostname/text()')[0],True)
                

    def addNode(self, testbed, hostname, mark):
        self.nodeModel.insertRow(0)
        self.nodeModel.setData(self.nodeModel.index(0,0), QString(testbed))
        self.nodeModel.setData(self.nodeModel.index(0,1), QString(hostname))
        if mark:msg="x"
        else:   msg="-"
        self.nodeModel.setData(self.nodeModel.index(0,2), QString(msg))


class MainScreen(SfaScreen):
    def __init__(self, parent=None):
        SfaScreen.__init__(self, parent)

        slice = SliceWidget(self)
        self.init(slice, "Main Window", "PlanetLab Federation GUI")
#        slice.refresh()