from PyQt4.QtCore import Qt, QString, SIGNAL
from PyQt4.QtGui import QWidget, QLabel, QTreeView, QStandardItemModel, QVBoxLayout, QSizePolicy

from sfa.util.rspecHelper import RSpec

from sfadata import SfaData
from 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, 2, self)
        self.nodeModel.setHeaderData(0, Qt.Horizontal, QString("Testbed"))
        self.nodeModel.setHeaderData(1, Qt.Horizontal, QString("Hostname"))

        self.nodeView.setModel(self.nodeModel)

        label = QLabel("<a href='refresh'>Refresh</a>", self)
        label.setScaledContents(False)

        layout = QVBoxLayout()
        layout.addWidget(label)
        layout.addWidget(self.nodeView)
        self.setLayout(layout)
        self.setSizePolicy(QSizePolicy.Expanding, QSizePolicy.Expanding)
        
        self.connect(label, SIGNAL('linkActivated(QString)'),
                     self.refresh)


    def rspec_get_networks(self, rspec):
        return rspec.rspec.xpath("./network[@name]/@name")

    def rspec_get_nodes_of_network(self, rspec, network):
        return rspec.rspec.xpath("./network[@name='%s']/site/node/hostname/text()" % network)

    def refresh(self, link=None):
        data = SfaData()
#        xml = data.getRSpecFromSM()
        import os
        xml = open(os.path.expanduser("~/.sfi/ple.inria.heartbeat.rspec")).read()
        rspec = RSpec(xml)

        networks = self.rspec_get_networks(rspec)
        networks.reverse()

        for network in networks:
            nodes = self.rspec_get_nodes_of_network(rspec, network)
            for node in nodes:
                self.addNode(network, node)

    def addNode(self, testbed, hostname):
        self.nodeModel.insertRow(0)
        self.nodeModel.setData(self.nodeModel.index(0,0), QString(testbed))
        self.nodeModel.setData(self.nodeModel.index(0,1), QString(hostname))



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

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