import calendar
import datetime
import os
import re
import sys
import time

from PyQt4.QtCore import *
from PyQt4.QtGui import *
from sface.config import config
from sface.sfiprocess import SfiProcess
#from sface.sfithread import SfiThread

class SfiRenewer(QObject):
    def __init__(self, hrn, newExpiration, parent=None):
        QObject.__init__(self, parent)
        self.hrn = hrn
        self.newExpiration = newExpiration
        self.faultString = None

        self.renewProcess = SfiProcess(self)
        self.connect(self.renewProcess, SIGNAL('finished()'), self.finishedGetRecord)
        self.renewProcess.getRecord(hrn=config.getSlice(), filename="/tmp/slicerecord")

    def finishedGetRecord(self):
        faultString = self.renewProcess.getFaultString()
        if faultString:
            self.emitFinished("fault", faultString)
            return

        f = open("/tmp/slicerecord", "r")
        data = f.read()
        f.close()

        # find the expiration time
        exp = re.compile('expires="[^"]*"')
        if exp.search(data)==None:
            # didn't find it
            self.emitFinished("failure", "failed to find expiration in slice record")
            return

        # change the expiration time
        delta = 24*60*60 # always extend the slice by one extra day to cover slop for time zone differences
        data = exp.sub('expires="' + str(calendar.timegm(self.newExpiration.timetuple())+delta) + '"', data)

        open("/tmp/slicerecord", "w").write(data)

        self.disconnect(self.renewProcess, SIGNAL('finished()'), self.finishedGetRecord)
        self.connect(self.renewProcess, SIGNAL('finished()'), self.finishedUpdateRecord)

        self.renewProcess.updateRecord("/tmp/slicerecord")

    def finishedUpdateRecord(self):
        faultString = self.renewProcess.getFaultString()
        if faultString:
            self.emitFinished("fault", faultString)
            return

        # we have to force sfi.py to download an updated slice credential
        sliceCredName = os.path.expanduser("~/.sfi/slice_" + self.hrn.split(".")[-1] + ".cred")
        if os.path.exists(sliceCredName):
            os.remove(sliceCredName)

        open("/tmp/expiration", "w").write(self.newExpiration.strftime("%Y-%m-%dT%H:%M:%SZ"))

        # call renewSlivers on the aggregate
        self.disconnect(self.renewProcess, SIGNAL('finished()'), self.finishedUpdateRecord)
        self.connect(self.renewProcess, SIGNAL('finished()'), self.finishedRenewSlivers)
        self.renewProcess.renewSlivers(self.newExpiration.strftime("%Y-%m-%dT%H:%M:%SZ"))

    def finishedRenewSlivers(self):
        faultString = self.renewProcess.getFaultString()
        if faultString:
            self.emitFinished("fault", faultString)
            return

        self.emitFinished("success")

    def emitFinished(self, status, statusMsg=None):
        self.status = status
        self.statusMsg = statusMsg
        self.emit(SIGNAL("finished()"))

class RenewWindow(QDialog):
    def __init__(self, parent=None):
        super(RenewWindow, self).__init__(parent)
        self.setWindowTitle("Renew Slivers")

        self.renewProcess = None

        self.duration = QComboBox()

        self.expirations = []

        durations = ( (1, "One Week"), (2, "Two Weeks"), (3, "Three Weeks"), (4, "One Month") )

        now = datetime.datetime.utcnow()
        for (weeks, desc) in durations:
            exp = now + datetime.timedelta(days = weeks * 7)
            desc = desc + " " + exp.strftime("%Y-%m-%d %H:%M:%S")
            self.expirations.append(exp)
            self.duration.addItem(desc)

        self.duration.setCurrentIndex(0)

        self.status = QLabel("")

        self.buttonBox = QDialogButtonBox(QDialogButtonBox.Ok | QDialogButtonBox.Cancel)
        self.buttonBox.button(QDialogButtonBox.Ok).setDefault(True)

        layout = QVBoxLayout()
        layout.addWidget(self.duration)
        layout.addWidget(self.status)
        layout.addWidget(self.buttonBox)
        self.setLayout(layout)

        #self.status.hide()

        self.connect(self.buttonBox, SIGNAL("accepted()"), self, SLOT("accept()"))
        self.connect(self.buttonBox, SIGNAL("rejected()"), self, SLOT("reject()"))

    def accept(self):
        self.setStatus("Renewing Slice...")

        self.renewProcess = SfiRenewer(config.getSlice(), self.get_new_expiration(), self)
        self.connect(self.renewProcess, SIGNAL('finished()'), self.renewFinished)

        self.duration.setEnabled(False)
        self.buttonBox.setEnabled(False)

    def setStatus(self, x):
        self.status.setText(x)

    def renewFinished(self):
        if self.renewProcess.status == "success":
            color = "green"
            # give the user the <close> button
            self.buttonBox.clear()
            self.buttonBox.addButton(QDialogButtonBox.Close)
        else:
            color = "red"

        if self.renewProcess.statusMsg:
            self.setStatus("<font color='%s'>Renew %s: %s</font>" % (color, self.renewProcess.status, self.renewProcess.statusMsg))
        else:
            self.setStatus("<font color='%s'>Renew %s</font>" % (color, self.renewProcess.status))

        self.buttonBox.setEnabled(True)

        self.disconnect(self.renewProcess, SIGNAL('finished()'), self.renewFinished)
        self.renewProcess = None

    def get_new_expiration(self):
        index = self.duration.currentIndex()
        return self.expirations[index]