"""
Select Provider Page, used in First Run Wizard
"""
import logging

from PyQt4 import QtCore
from PyQt4 import QtGui

#from leap.base import exceptions as baseexceptions
#from leap.crypto import certs
#from leap.eip import exceptions as eipexceptions

from leap.gui.constants import APP_LOGO
from leap.gui.styles import ErrorLabelStyleSheet

logger = logging.getLogger(__name__)


class SelectProviderPage(QtGui.QWizardPage):
    def __init__(self, parent=None, providers=None):
        super(SelectProviderPage, self).__init__(parent)

        self.setTitle("Enter Provider")
        self.setSubTitle(
            "Please enter the domain of the provider you want "
            "to use for your connection."
        )
        self.setPixmap(
            QtGui.QWizard.LogoPixmap,
            QtGui.QPixmap(APP_LOGO))

        self.did_cert_check = False
        self.current_page = 'providerselection'

        providerNameLabel = QtGui.QLabel("h&ttps://")
        # note that we expect the bare domain name
        # we will add the scheme later
        providerNameEdit = QtGui.QLineEdit()
        providerNameEdit.cursorPositionChanged.connect(
            self.reset_validation_status)
        providerNameLabel.setBuddy(providerNameEdit)

        # add regex validator
        providerDomainRe = QtCore.QRegExp(r"^[a-z\d_-.]+$")
        providerNameEdit.setValidator(
            QtGui.QRegExpValidator(providerDomainRe, self))
        self.providerNameEdit = providerNameEdit

        # Eventually we will seed a list of
        # well known providers here.

        #providercombo = QtGui.QComboBox()
        #if providers:
            #for provider in providers:
                #providercombo.addItem(provider)
        #providerNameSelect = providercombo

        self.registerField("provider_domain*", self.providerNameEdit)
        #self.registerField('provider_name_index', providerNameSelect)

        validationMsg = QtGui.QLabel("")
        validationMsg.setStyleSheet(ErrorLabelStyleSheet)
        self.validationMsg = validationMsg

        # cert info

        # this is used in the callback
        # for the checkbox changes.
        # tricky, since the first time came
        # from the exception message.
        # should get string from exception too!
        self.bad_cert_status = "Server certificate could not be verified."

        self.certInfo = QtGui.QLabel("")
        self.certInfo.setWordWrap(True)
        self.certWarning = QtGui.QLabel("")
        self.trustProviderCertCheckBox = QtGui.QCheckBox(
            "&Trust this provider certificate.")

        self.trustProviderCertCheckBox.stateChanged.connect(
            self.onTrustCheckChanged)
        self.providerNameEdit.textChanged.connect(
            self.onProviderChanged)

        layout = QtGui.QGridLayout()
        layout.addWidget(validationMsg, 0, 2)
        layout.addWidget(providerNameLabel, 1, 1)
        layout.addWidget(providerNameEdit, 1, 2)

        # XXX get a groupbox or something....
        certinfoGroup = QtGui.QGroupBox("Certificate validation")
        certinfoLayout = QtGui.QVBoxLayout()
        certinfoLayout.addWidget(self.certInfo)
        certinfoLayout.addWidget(self.certWarning)
        certinfoLayout.addWidget(self.trustProviderCertCheckBox)
        certinfoGroup.setLayout(certinfoLayout)

        layout.addWidget(certinfoGroup, 4, 1, 4, 2)
        self.certinfoGroup = certinfoGroup
        self.certinfoGroup.hide()

        self.setLayout(layout)

    def is_insecure_cert_trusted(self):
        return self.trustProviderCertCheckBox.isChecked()

    def onTrustCheckChanged(self, state):
        checked = False
        if state == 2:
            checked = True

        if checked:
            self.reset_validation_status()
        else:
            self.set_validation_status(self.bad_cert_status)

        # trigger signal to redraw next button
        self.completeChanged.emit()

    def onProviderChanged(self, text):
        self.completeChanged.emit()

    def reset_validation_status(self):
        """
        empty the validation msg
        """
        self.validationMsg.setText('')

    #def set_validation_status(selF, STATUS):
        #self.validationMsg.setText(status)

    def add_cert_info(self, certinfo):
        self.certWarning.setText(
            "Do you want to <b>trust this provider certificate?</b>")
        self.certInfo.setText(
            'SHA-256 fingerprint: <i>%s</i><br>' % certinfo)
        self.certInfo.setWordWrap(True)
        self.certinfoGroup.show()

    # pagewizard methods

    def isComplete(self):
        provider = self.providerNameEdit.text()

        if not provider:
            return False
        else:
            if self.is_insecure_cert_trusted():
                return True
            if not self.did_cert_check:
                return True
            return False

    def populateErrors(self):
        # XXX could move this to ValidationMixin
        # with some defaults for the validating fields
        # (now it only allows one field, manually specified)

        #logger.debug('getting errors')
        errors = self.wizard().get_validation_error(
            self.current_page)
        if errors:
            bad_str = getattr(self, 'bad_string', None)
            cur_str = self.providerNameEdit.text()
            showerr = self.validationMsg.setText
            if bad_str is None:
                # first time we fall here.
                # save the current bad_string value
                self.bad_string = cur_str
                showerr(errors)
            else:
                # not the first time
                if cur_str == bad_str:
                    showerr(errors)
                else:
                    showerr('')

    def paintEvent(self, event):
        """
        we hook our populate errors
        on paintEvent because we need it to catch
        when user enters the page coming from next,
        and initializePage does not cover that case.
        Maybe there's a better event to hook upon.
        """
        super(SelectProviderPage, self).paintEvent(event)
        self.populateErrors()

    def initializePage(self):
        self.validationMsg.setText('')
        self.certinfoGroup.hide()

    def nextId(self):
        wizard = self.wizard()
        if not wizard:
            return
        return wizard.get_page_index('providerinfo')