# -*- coding: utf-8 -*-
#
# This file is part of SENAITE.CORE.
#
# SENAITE.CORE is free software: you can redistribute it and/or modify it under
# the terms of the GNU General Public License as published by the Free Software
# Foundation, version 2.
#
# This program is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
# details.
#
# You should have received a copy of the GNU General Public License along with
# this program; if not, write to the Free Software Foundation, Inc., 51
# Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
#
# Copyright 2018-2019 by it's authors.
# Some rights reserved, see README and LICENSE.

import re

import transaction
from bika.lims import PMF
from bika.lims import api
from bika.lims import bikaMessageFactory as _
from bika.lims import logger
from bika.lims.api import security
from bika.lims.browser import BrowserView
from bika.lims.content.contact import Contact
from bika.lims.content.labcontact import LabContact
from plone.app.controlpanel.usergroups import UsersOverviewControlPanel
from plone.memoize import view
from plone.protect import CheckAuthenticator
from Products.CMFCore.utils import getToolByName
from Products.CMFPlone.utils import safe_unicode
from Products.Five.browser.pagetemplatefile import ViewPageTemplateFile


class ContactLoginDetailsView(BrowserView):
    """Contact Login View
    """
    template = ViewPageTemplateFile("templates/login_details.pt")

    def __call__(self):
        request = self.request
        form = request.form
        CheckAuthenticator(form)

        self.newSearch = False
        self.searchstring = form.get("searchstring", "")

        if form.get("submitted"):
            logger.debug("Form Submitted: {}".format(form))
            if form.get("unlink_button", False):
                self._unlink_user()
            elif form.get("search_button", False):
                logger.debug("Search User")
                self.newSearch = True
            elif form.get("link_button", False):
                logger.debug("Link User")
                self._link_user(form.get("userid"))
            elif form.get("save_button", False):
                logger.debug("Create User")
                self._create_user()

        return self.template()

    @view.memoize
    def get_users(self):
        """Get all users of the portal
        """
        # We make use of the existing controlpanel `@@usergroup-userprefs`
        # view logic to make sure we get all users from all plugins (e.g. LDAP)
        users_view = UsersOverviewControlPanel(self.context, self.request)
        return users_view.doSearch("")

    def get_user_properties(self):
        """Return the properties of the User
        """

        user = self.context.getUser()

        # No User linked, nothing to do
        if user is None:
            return {}

        out = {}
        plone_user = user.getUser()
        userid = plone_user.getId()
        for sheet in plone_user.listPropertysheets():
            ps = plone_user.getPropertysheet(sheet)
            out.update(dict(ps.propertyItems()))

        portal = api.get_portal()
        mtool = getToolByName(self.context, 'portal_membership')

        out["id"] = userid
        out["portrait"] = mtool.getPersonalPortrait(id=userid)
        out["edit_url"] = "{}/@@user-information?userid={}".format(
            portal.absolute_url(), userid)

        return out

    def get_contact_properties(self):
        """Return the properties of the Contact
        """
        contact = self.context

        return {
            "fullname": contact.getFullname(),
            "username": contact.getUsername(),
        }

    def linkable_users(self):
        """Search Plone users which are not linked to a contact or lab contact
        """

        # Only users with at nost these roles are displayed
        linkable_roles = {"Authenticated", "Member", "Client"}

        out = []
        for user in self.get_users():
            userid = user.get("id", None)

            if userid is None:
                continue

            # Skip users which are already linked to a Contact
            contact = Contact.getContactByUsername(userid)
            labcontact = LabContact.getContactByUsername(userid)

            if contact or labcontact:
                continue
            if self.is_contact():
                # Checking Plone user belongs to Client group only. Otherwise,
                # weird things could happen (a client contact assigned to a
                # user with labman privileges, different contacts from
                # different clients assigned to the same user, etc.)
                user_roles = security.get_roles(user=userid)
                if not linkable_roles.issuperset(set(user_roles)):
                    continue
            userdata = {
                "userid": userid,
                "email": user.get("email"),
                "fullname": user.get("title"),
            }

            # filter out users which do not match the searchstring
            if self.searchstring:
                s = self.searchstring.lower()
                if not any(
                        map(lambda v: re.search(s, str(v).lower()),
                            userdata.values())):
                    continue

            # update data (maybe for later use)
            userdata.update(user)

            # Append the userdata for the results
            out.append(userdata)

        out.sort(lambda x, y: cmp(x["fullname"], y["fullname"]))
        return out

    def is_contact(self):
        """Check if the current context is a Contact
        """
        if self.context.portal_type == "Contact":
            return True
        return False

    def is_labcontact(self):
        """Check if the current context is a LabContact
        """
        if self.context.portal_type == "LabContact":
            return True
        return False

    def _link_user(self, userid):
        """Link an existing user to the current Contact
        """
        # check if we have a selected user from the search-list
        if userid:
            try:
                self.context.setUser(userid)
                self.add_status_message(
                    _("User linked to this Contact"), "info")
            except ValueError, e:
                self.add_status_message(e, "error")
        else:
            self.add_status_message(
                _("Please select a User from the list"), "info")

    def _unlink_user(self):
        """Unlink and delete the User from the current Contact
        """
        self.context.unlinkUser()
        self.add_status_message(_("Unlinked User"), "info")

    def add_status_message(self, message, severity="info"):
        """Set a portal message
        """
        self.context.plone_utils.addPortalMessage(message, severity)

    def _create_user(self):
        """Create a new user
        """

        def error(field, message):
            if field:
                message = "%s: %s" % (field, message)
            self.context.plone_utils.addPortalMessage(message, 'error')
            return self.request.response.redirect(
                self.context.absolute_url() + "/login_details")

        form = self.request.form
        contact = self.context

        password = safe_unicode(form.get('password', '')).encode('utf-8')
        username = safe_unicode(form.get('username', '')).encode('utf-8')
        confirm = form.get('confirm', '')
        email = safe_unicode(form.get('email', '')).encode('utf-8')

        if not username:
            return error('username', PMF("Input is required but not given."))

        if not email:
            return error('email', PMF("Input is required but not given."))

        reg_tool = self.context.portal_registration
        # properties = self.context.portal_properties.site_properties
        # if properties.validate_email:
        #     password = reg_tool.generatePassword()
        # else:
        if password != confirm:
            return error('password', PMF("Passwords do not match."))

        if not password:
            return error('password', PMF("Input is required but not given."))

        if not confirm:
            return error('password', PMF("Passwords do not match."))

        if len(password) < 5:
            return error('password', PMF("Passwords must contain at least 5 "
                                         "characters."))
        for user in self.get_users():
            userid = user.get("id", None)
            if userid is None:
                continue
            user_obj = api.get_user(userid)
            if user_obj.getUserName() == username:
                msg = "Username {} already exists, please, choose " \
                      "another one.".format(username)
                return error(None, msg)

        try:
            reg_tool.addMember(username,
                               password,
                               properties={
                                   'username': username,
                                   'email': email,
                                   'fullname': username})
        except ValueError, msg:
            return error(None, msg)

        # set the user to the contact
        contact.setUser(username)

        # Additional groups for LabContact users only!
        # -> This is not visible in the Client Contact Form
        if "groups" in self.request and self.request["groups"]:
            groups = self.request["groups"]
            if not type(groups) in (list, tuple):
                groups = [groups, ]
            for group in groups:
                group = self.portal_groups.getGroupById(group)
                group.addMember(username)

        if self.request.get('mail_me', 0):
            try:
                reg_tool.registeredNotify(username)
            except Exception:
                transaction.abort()
                message = _("SMTP server disconnected. User creation aborted.")
                return error(None, message)

        message = _("Member registered and linked to the current Contact.")
        self.context.plone_utils.addPortalMessage(message, 'info')
        return self.request.response.redirect(
            self.context.absolute_url() + "/login_details")

    def tabindex(self):
        i = 0
        while True:
            i += 1
            yield i
