#!/usr/bin/env python
import logging
import json
import socket

import sip
sip.setapi('QString', 2)
sip.setapi('QVariant', 2)

from PyQt4 import QtCore
from PyQt4 import QtGui

from leap.base.auth import LeapSRPRegister
from leap.base import checks as basechecks
from leap.base import exceptions as baseexceptions
from leap.crypto import certs
from leap.crypto import leapkeyring
from leap.eip import checks as eipchecks
from leap.eip import exceptions as eipexceptions
from leap.gui import mainwindow_rc

try:
    from collections import OrderedDict
except ImportError:
    # We must be in 2.6
    from leap.util.dicts import OrderedDict

# XXX DEBUG
logging.basicConfig()
logger = logging.getLogger(__name__)
logger.setLevel(logging.DEBUG)

APP_LOGO = ':/images/leap-color-small.png'


ErrorLabelStyleSheet = """
QLabel { color: red;
         font-weight: bold}
"""


class FirstRunWizard(QtGui.QWizard):

    def __init__(
            self, parent=None, providers=None,
            success_cb=None, is_provider_setup=False,
            is_previously_registered=False,
            netchecker=basechecks.LeapNetworkChecker,
            providercertchecker=eipchecks.ProviderCertChecker,
            eipconfigchecker=eipchecks.EIPConfigChecker):
        super(FirstRunWizard, self).__init__(
            parent,
            QtCore.Qt.WindowStaysOnTopHint)

        # XXX hardcoded for tests
        #if not providers:
            #providers = ('springbok',)
        self.providers = providers

        # success callback
        self.success_cb = success_cb

        # is provider setup?
        self.is_provider_setup = is_provider_setup

        # previously registered
        # if True, jumps to LogIn page.
        self.is_previously_registered = is_previously_registered

        # Checkers
        self.netchecker = netchecker
        self.providercertchecker = providercertchecker
        self.eipconfigchecker = eipconfigchecker

        # FIXME add param for previously_registered
        # should start at login page.

        pages_dict = OrderedDict((
            # (name, WizardPage)
            ('intro', IntroPage),
            ('providerselection',
                SelectProviderPage),
            ('login', LogInPage),
            ('providerinfo', ProviderInfoPage),
            ('providersetup', ProviderSetupPage),
            ('signup', RegisterUserPage),
            ('connecting', ConnectingPage),
            ('lastpage', LastPage)
        ))
        self.add_pages_from_dict(pages_dict)

        self.setPixmap(
            QtGui.QWizard.BannerPixmap,
            QtGui.QPixmap(':/images/banner.png'))
        self.setPixmap(
            QtGui.QWizard.BackgroundPixmap,
            QtGui.QPixmap(':/images/background.png'))

        self.setWindowTitle("First Run Wizard")

        # TODO: set style for MAC / windows ...
        #self.setWizardStyle()

    def add_pages_from_dict(self, pages_dict):
        """
        @param pages_dict: the dictionary with pages, where
            values are a tuple of InstanceofWizardPage, kwargs.
        @type pages_dict: dict
        """
        for name, page in pages_dict.items():
            # XXX check for is_previously registered
            # and skip adding the signup branch if so
            self.addPage(page())
        self.pages_dict = pages_dict

    def get_page_index(self, page_name):
        """
        returns the index of the given page
        @param page_name: the name of the desired page
        @type page_name: str
        @rparam: index of page in wizard
        @rtype: int
        """
        return self.pages_dict.keys().index(page_name)

    def setWindowFlags(self, flags):
        logger.debug('setting window flags')
        QtGui.QWizard.setWindowFlags(self, flags)

    def focusOutEvent(self, event):
        # needed ?
        self.setFocus(True)
        self.activateWindow()
        self.raise_()
        self.show()

    def accept(self):
        """
        final step in the wizard.
        gather the info, update settings
        and call the success callback.
        """
        provider = self.get_provider()
        username = self.field('userName')
        #password = self.field('userPassword')
        remember_pass = self.field('rememberPassword')

        logger.debug('chosen provider: %s', provider)
        logger.debug('username: %s', username)
        logger.debug('remember password: %s', remember_pass)
        super(FirstRunWizard, self).accept()

        settings = QtCore.QSettings()
        settings.setValue("FirstRunWizardDone", True)
        settings.setValue(
            "eip_%s_username" % provider,
            username)
        settings.setValue("%s_remember_pass" % provider, remember_pass)

        seed = self.get_random_str(10)
        settings.setValue("%s_seed" % provider, seed)

        # Commenting out for 0.2.0 release
        # since we did not fix #744 on time.

        #leapkeyring.leap_set_password(username, password, seed=seed)

        logger.debug('First Run Wizard Done.')
        cb = self.success_cb
        if cb and callable(cb):
            self.success_cb()

    def get_provider_by_index(self):
        provider = self.field('provider_index')
        return self.providers[provider]

    def get_random_str(self, n):
        from string import (ascii_uppercase, ascii_lowercase, digits)
        from random import choice
        return ''.join(choice(
            ascii_uppercase +
            ascii_lowercase +
            digits) for x in range(n))


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

        self.setTitle("First run wizard.")

        #self.setPixmap(
            #QtGui.QWizard.WatermarkPixmap,
            #QtGui.QPixmap(':/images/watermark1.png'))

        self.setPixmap(
            QtGui.QWizard.LogoPixmap,
            QtGui.QPixmap(APP_LOGO))

        label = QtGui.QLabel(
            "Now we will guide you through "
            "some configuration that is needed before you "
            "can connect for the first time.<br><br>"
            "If you ever need to modify these options again, "
            "you can find the wizard in the '<i>Settings</i>' menu from the "
            "main window.<br><br>"
            "Do you want to <b>sign up</b> for a new account, or <b>log "
            "in</b> with an already existing username?<br>")
        label.setWordWrap(True)

        self.sign_up = QtGui.QRadioButton(
            "Sign up for a new account.")
        self.sign_up.setChecked(True)
        self.log_in = QtGui.QRadioButton(
            "Log In with my credentials.")

        layout = QtGui.QVBoxLayout()
        layout.addWidget(label)
        layout.addWidget(self.sign_up)
        layout.addWidget(self.log_in)
        self.setLayout(layout)

        self.registerField('is_signup', self.sign_up)

    def validatePage(self):
        return True

    def nextId(self):
        """
        returns next id
        in a non-linear wizard
        """
        if self.sign_up.isChecked():
            next_ = 'providerselection'
        if self.log_in.isChecked():
            next_ = 'login'
        wizard = self.wizard()
        return wizard.get_page_index(next_)


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))

        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

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

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

        # XXX get a groupbox or something....
        layout.addWidget(self.certInfo, 4, 1, 4, 2)
        layout.addWidget(self.certWarning, 6, 1, 6, 2)
        layout.addWidget(
            self.trustProviderCertCheckBox,
            8, 1, 8, 2)
        self.trustProviderCertCheckBox.hide()

        self.setLayout(layout)

    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 trust this provider certificate?")
        self.certInfo.setText(
            'Certificate sha1: <i>%s</i><br>' % certinfo)
        self.trustProviderCertCheckBox.show()
        # XXX when checkbox is marked, remove
        # the red warning.
        # XXX also, disable the next button!

    def initializePage(self):
        self.certWarning.setText('')
        self.certInfo.setText('')
        self.trustProviderCertCheckBox.hide()

    def validatePage(self):
        wizard = self.wizard()
        netchecker = wizard.netchecker()
        providercertchecker = wizard.providercertchecker()

        domain = self.providerNameEdit.text()

        # try name resolution
        try:
            netchecker.check_name_resolution(
                domain)

        except baseexceptions.LeapException as exc:
            self.set_validation_status(exc.usermessage)
            return False

        # try https connection
        try:
            providercertchecker.is_https_working(
                "https://%s" % domain,
                verify=True)

        except eipexceptions.HttpsBadCertError as exc:
            if self.trustProviderCertCheckBox.isChecked():
                pass
            else:
                self.set_validation_status(exc.usermessage)
                fingerprint = certs.get_https_cert_fingerprint(
                    domain)
                self.add_cert_info(fingerprint)
                return False

        except baseexceptions.LeapException as exc:
            self.set_validation_status(exc.usermessage)
            return False

        # try download provider info...
        # TODO ...

        # all ok, go on...
        return True

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


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

        self.setTitle("Provider Info")
        self.setSubTitle("Available information about chosen provider.")

        self.setPixmap(
            QtGui.QWizard.LogoPixmap,
            QtGui.QPixmap(APP_LOGO))

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


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

        self.setTitle("Provider Setup")
        self.setSubTitle("Setting up provider.")

        self.setPixmap(
            QtGui.QWizard.LogoPixmap,
            QtGui.QPixmap(APP_LOGO))

    def nextId(self):
        wizard = self.wizard()
        if not wizard:
            return
        is_signup = self.field('is_signup')
        if is_signup is True:
            next_ = 'signup'
        if is_signup is False:
            next_ = 'connecting'
        return wizard.get_page_index(next_)


class UserFormMixIn(object):

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

    def set_status_validating(self):
        """
        set validation msg to 'registering...'
        """
        # XXX  this is NOT WORKING.
        # My guess is that, even if we are using
        # signals to trigger this, it does
        # not show until the validate function
        # returns.
        # I guess it is because there is no delay...
        logger.debug('registering........')
        self.validationMsg.setText('registering...')
        # need to call update somehow???

    # XXX refactor set_status_foo

    def set_status_invalid_username(self):
        """
        set validation msg to
        not available user
        """
        self.validationMsg.setText('Username not available.')

    def set_status_server_500(self):
        """
        set validation msg to
        internal server error
        """
        self.validationMsg.setText("Error during registration (500)")

    def set_status_timeout(self):
        """
        set validation msg to
        timeout
        """
        self.validationMsg.setText("Error connecting to provider (timeout)")

    def set_status_connerror(self):
        """
        set validation msg to
        connection refused
        """
        self.validationMsg.setText(
            "Error connecting to provider "
            "(connection error)")

    def set_status_unknown_error(self):
        """
        set validation msg to
        unknown error
        """
        self.validationMsg.setText("Error during sign up")


class LogInPage(QtGui.QWizardPage, UserFormMixIn):
    def __init__(self, parent=None):
        super(LogInPage, self).__init__(parent)

        self.setTitle("Log In")
        self.setSubTitle("Log in with your credentials.")

        self.setPixmap(
            QtGui.QWizard.LogoPixmap,
            QtGui.QPixmap(APP_LOGO))

        userNameLabel = QtGui.QLabel("User &name:")
        userNameLineEdit = QtGui.QLineEdit()
        userNameLineEdit.cursorPositionChanged.connect(
            self.reset_validation_status)
        userNameLabel.setBuddy(userNameLineEdit)

        # add regex validator
        usernameRe = QtCore.QRegExp(r"^[A-Za-z\d_]+$")
        userNameLineEdit.setValidator(
            QtGui.QRegExpValidator(usernameRe, self))
        self.userNameLineEdit = userNameLineEdit

        userPasswordLabel = QtGui.QLabel("&Password:")
        self.userPasswordLineEdit = QtGui.QLineEdit()
        self.userPasswordLineEdit.setEchoMode(
            QtGui.QLineEdit.Password)
        userPasswordLabel.setBuddy(self.userPasswordLineEdit)

        self.registerField('log_in_userName*', self.userNameLineEdit)
        self.registerField('log_in_userPassword*', self.userPasswordLineEdit)

        layout = QtGui.QGridLayout()
        layout.setColumnMinimumWidth(0, 20)

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

        self.validationMsg = validationMsg

        layout.addWidget(validationMsg, 0, 3)

        layout.addWidget(userNameLabel, 1, 0)
        layout.addWidget(self.userNameLineEdit, 1, 3)

        layout.addWidget(userPasswordLabel, 2, 0)
        layout.addWidget(self.userPasswordLineEdit, 2, 3)

        self.setLayout(layout)

    def nextId(self):
        wizard = self.wizard()
        if not wizard:
            return
        if wizard.is_provider_setup is True:
            next_ = 'connecting'
        if wizard.is_provider_setup is False:
            next_ = 'providersetup'
        return wizard.get_page_index(next_)


class RegisterUserPage(QtGui.QWizardPage, UserFormMixIn):
    setSigningUpStatus = QtCore.pyqtSignal([])

    def __init__(self, parent=None):
        super(RegisterUserPage, self).__init__(parent)

        # bind wizard page signals
        self.setSigningUpStatus.connect(
            self.set_status_validating)

        self.setTitle("Sign Up")

        self.setPixmap(
            QtGui.QWizard.LogoPixmap,
            QtGui.QPixmap(APP_LOGO))

        userNameLabel = QtGui.QLabel("User &name:")
        userNameLineEdit = QtGui.QLineEdit()
        userNameLineEdit.cursorPositionChanged.connect(
            self.reset_validation_status)
        userNameLabel.setBuddy(userNameLineEdit)

        # add regex validator
        usernameRe = QtCore.QRegExp(r"^[A-Za-z\d_]+$")
        userNameLineEdit.setValidator(
            QtGui.QRegExpValidator(usernameRe, self))
        self.userNameLineEdit = userNameLineEdit

        userPasswordLabel = QtGui.QLabel("&Password:")
        self.userPasswordLineEdit = QtGui.QLineEdit()
        self.userPasswordLineEdit.setEchoMode(
            QtGui.QLineEdit.Password)
        userPasswordLabel.setBuddy(self.userPasswordLineEdit)

        rememberPasswordCheckBox = QtGui.QCheckBox(
            "&Remember username and password.")
        rememberPasswordCheckBox.setChecked(True)

        self.registerField('userName*', self.userNameLineEdit)
        self.registerField('userPassword*', self.userPasswordLineEdit)
        self.registerField('rememberPassword', rememberPasswordCheckBox)

        layout = QtGui.QGridLayout()
        layout.setColumnMinimumWidth(0, 20)

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

        self.validationMsg = validationMsg

        layout.addWidget(validationMsg, 0, 3)

        layout.addWidget(userNameLabel, 1, 0)
        layout.addWidget(self.userNameLineEdit, 1, 3)

        layout.addWidget(userPasswordLabel, 2, 0)
        layout.addWidget(self.userPasswordLineEdit, 2, 3)

        layout.addWidget(rememberPasswordCheckBox, 3, 3, 3, 4)
        self.setLayout(layout)

    # overwritten methods

    def initializePage(self):
        """
        inits wizard page
        """
        provider = self.field('provider_domain')
        self.setSubTitle(
            "Register a new user with provider %s." %
            provider)
        self.validationMsg.setText('')

    def validatePage(self):
        """
        validation
        we initialize the srp protocol register
        and try to register user. if error
        returned we write validation error msg
        above the form.
        """
        # the slot for this signal is not doing
        # what's expected. Investigate why,
        # right now we're not giving any feedback
        # to the user re. what's going on. The only
        # thing I can see as a workaround is setting
        # a low timeout.
        self.setSigningUpStatus.emit()

        username = self.userNameLineEdit.text()
        password = self.userPasswordLineEdit.text()

        # XXX TODO -- remove debug info
        # XXX get from provider info
        # XXX enforce https
        # and pass a verify value

        signup = LeapSRPRegister(
            schema="http",
            provider="springbok",

            # debug -----
            #provider="localhost",
            #register_path="timeout",
            #port=8000
        )
        try:
            ok, req = signup.register_user(username, password)
        except socket.timeout:
            self.set_status_timeout()
            return False

        except requests.exceptions.ConnectionError as exc:
            logger.error(exc)
            self.set_status_connerror()
            return False

        if ok:
            return True

        # something went wrong.
        # not registered, let's catch what.
        # get timeout
        # ...
        if req.status_code == 500:
            self.set_status_server_500()
            return False

        validation_msgs = json.loads(req.content)
        logger.debug('validation errors: %s' % validation_msgs)
        errors = validation_msgs.get('errors', None)
        if errors and errors.get('login', None):
            # XXX this sometimes catch the blank username
            # but we're not allowing that (soon)
            self.set_status_invalid_username()
        else:
            self.set_status_unknown_error()
        return False

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


class GlobalEIPSettings(QtGui.QWizardPage):
    """
    not in use right now
    """
    def __init__(self, parent=None):
        super(GlobalEIPSettings, self).__init__(parent)


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

        self.setTitle("Connecting")
        self.setSubTitle('Connecting to provider.')

        self.setPixmap(
            QtGui.QWizard.LogoPixmap,
            QtGui.QPixmap(APP_LOGO))


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

        self.setTitle("Ready to go!")

        self.setPixmap(
            QtGui.QWizard.LogoPixmap,
            QtGui.QPixmap(APP_LOGO))

        #self.setPixmap(
            #QtGui.QWizard.WatermarkPixmap,
            #QtGui.QPixmap(':/images/watermark2.png'))

        self.label = QtGui.QLabel()
        self.label.setWordWrap(True)

        layout = QtGui.QVBoxLayout()
        layout.addWidget(self.label)
        self.setLayout(layout)

    def initializePage(self):
        finishText = self.wizard().buttonText(
            QtGui.QWizard.FinishButton)
        finishText = finishText.replace('&', '')
        self.label.setText(
            "Click '<i>%s</i>' to end the wizard and start "
            "encrypting your connection." % finishText)


if __name__ == '__main__':
    # standalone test
    import sys
    import logging
    logging.basicConfig()
    logger = logging.getLogger()
    logger.setLevel(logging.DEBUG)

    app = QtGui.QApplication(sys.argv)
    wizard = FirstRunWizard(providers=('springbok',))
    wizard.show()
    sys.exit(app.exec_())