"""
This module defines views for user database handling.

"""
from __future__ import absolute_import, unicode_literals

from django.core.exceptions import SuspiciousOperation
from django.shortcuts import redirect
from django.utils.translation import ugettext as _
from django.views.generic.edit import (
    CreateView,
    DeleteView,
    UpdateView,
)
from django.contrib import messages

from gvacommon.viewmixins import StaffOrSelfLoginRequiredMixin
from gvawebcore.views import HostingPackageAndCustomerMixin

from .forms import (
    AddUserDatabaseForm,
    ChangeDatabaseUserPasswordForm,
)
from .models import (
    DB_TYPES,
    DatabaseUser,
    UserDatabase,
)


class AddUserDatabase(
    HostingPackageAndCustomerMixin, StaffOrSelfLoginRequiredMixin, CreateView
):
    """
    This view is used to setup new user databases.

    """
    model = UserDatabase
    context_object_name = 'database'
    template_name_suffix = '_create'
    form_class = AddUserDatabaseForm

    def _get_dbtypes(self, hostingpackage):
        retval = []
        db_options = hostingpackage.get_databases()
        for opt in db_options:
            dbs_of_type = UserDatabase.objects.filter(
                db_user__osuser=hostingpackage.osuser,
                db_user__db_type=opt['db_type']).count()
            if dbs_of_type < opt['number']:
                retval.append((opt['db_type'], DB_TYPES[opt['db_type']]))
        if len(retval) < 1:
            raise SuspiciousOperation(
                _("The hosting package has no database products assigned."))
        return retval

    def get_form_kwargs(self):
        kwargs = super(AddUserDatabase, self).get_form_kwargs()
        kwargs['hostingpackage'] = self.get_hosting_package()
        kwargs['dbtypes'] = self._get_dbtypes(kwargs['hostingpackage'])
        return kwargs

    def form_valid(self, form):
        userdatabase = form.save()
        messages.success(
            self.request,
            _('Successfully create new {type} database {dbname} for user '
              '{dbuser}.').format(
                  type=userdatabase.db_user.db_type,
                  dbname=userdatabase.db_name, dbuser=userdatabase.db_user)
        )
        return redirect(self.get_hosting_package())


class ChangeDatabaseUserPassword(
    HostingPackageAndCustomerMixin, StaffOrSelfLoginRequiredMixin, UpdateView
):
    """
    This view is used to change a database user's password.

    """
    model = DatabaseUser
    slug_field = 'name'
    context_object_name = 'dbuser'
    template_name_suffix = '_setpassword'
    form_class = ChangeDatabaseUserPasswordForm

    def get_form_kwargs(self):
        kwargs = super(ChangeDatabaseUserPassword, self).get_form_kwargs()
        kwargs['hostingpackage'] = self.get_hosting_package()
        return kwargs

    def get_context_data(self, **kwargs):
        context = super(ChangeDatabaseUserPassword, self).get_context_data(
            **kwargs)
        context['hostingpackage'] = self.get_hosting_package()
        context['customer'] = self.get_customer_object()
        return context

    def form_valid(self, form):
        db_user = form.save()
        messages.success(
            self.request,
            _('Successfully changed password of database user {dbuser}.'
              ).format(dbuser=db_user.name)
        )
        return redirect(self.get_hosting_package())


class DeleteUserDatabase(
    HostingPackageAndCustomerMixin, StaffOrSelfLoginRequiredMixin, DeleteView
):
    """
    This view is used to delete user databases and databases users if they have
    no more databases assigned.

    """
    model = UserDatabase
    slug_field = 'db_name'
    context_object_name = 'database'

    def get_context_data(self, **kwargs):
        context = super(DeleteUserDatabase, self).get_context_data(**kwargs)
        context.update({
            'hostingpackage': self.get_hosting_package(),
            'customer': self.get_customer_object(),
        })
        return context

    def get_success_url(self):
        messages.success(
            self.request,
            _('Database deleted.'),
        )
        return self.get_hosting_package().get_absolute_url()