# Xandikos
# Copyright (C) 2016-2017 Jelmer Vernooĳ <jelmer@jelmer.uk>, et al.
#
# This program 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 3
# of the License or (at your option) any later version of
# the License.
#
# 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.

"""Scheduling.

See https://tools.ietf.org/html/rfc6638
"""

from xandikos import caldav, webdav

SCHEDULE_INBOX_RESOURCE_TYPE = "{%s}schedule-inbox" % caldav.NAMESPACE
SCHEDULE_OUTBOX_RESOURCE_TYPE = "{%s}schedule-outbox" % caldav.NAMESPACE

# Feature to advertise to indicate scheduling support.
FEATURE = "calendar-auto-schedule"

CALENDAR_USER_TYPE_INDIVIDUAL = "INDIVIDUAL"  # An individual
CALENDAR_USER_TYPE_GROUP = "GROUP"  # A group of individuals
CALENDAR_USER_TYPE_RESOURCE = "RESOURCE"  # A physical resource
CALENDAR_USER_TYPE_ROOM = "ROOM"  # A room resource
CALENDAR_USER_TYPE_UNKNOWN = "UNKNOWN"  # Otherwise not known

CALENDAR_USER_TYPES = (
    CALENDAR_USER_TYPE_INDIVIDUAL,
    CALENDAR_USER_TYPE_GROUP,
    CALENDAR_USER_TYPE_RESOURCE,
    CALENDAR_USER_TYPE_ROOM,
    CALENDAR_USER_TYPE_UNKNOWN,
)


class ScheduleInbox(webdav.Collection):
    resource_types = webdav.Collection.resource_types + [SCHEDULE_INBOX_RESOURCE_TYPE]

    def get_calendar_user_type(self):
        # Default, per section 2.4.2
        return CALENDAR_USER_TYPE_INDIVIDUAL

    def get_calendar_timezone(self):
        """Return calendar timezone.

        This should be an iCalendar object with exactly one
        VTIMEZONE component.
        """
        raise NotImplementedError(self.get_calendar_timezone)

    def set_calendar_timezone(self):
        """Set calendar timezone.

        This should be an iCalendar object with exactly one
        VTIMEZONE component.
        """
        raise NotImplementedError(self.set_calendar_timezone)

    def get_supported_calendar_components(self):
        """Return set of supported calendar components in this calendar.

        Returns: iterable over component names
        """
        raise NotImplementedError(self.get_supported_calendar_components)

    def get_supported_calendar_data_types(self):
        """Return supported calendar data types.

        Returns: iterable over (content_type, version) tuples
        """
        raise NotImplementedError(self.get_supported_calendar_data_types)

    def get_min_date_time(self):
        """Return minimum datetime property."""
        raise NotImplementedError(self.get_min_date_time)

    def get_max_date_time(self):
        """Return maximum datetime property."""
        raise NotImplementedError(self.get_max_date_time)

    def get_max_instances(self):
        """Return maximum number of instances."""
        raise NotImplementedError(self.get_max_instances)

    def get_max_attendees_per_instance(self):
        """Return maximum number of attendees per instance."""
        raise NotImplementedError(self.get_max_attendees_per_instance)

    def get_max_resource_size(self):
        """Return max resource size."""
        raise NotImplementedError(self.get_max_resource_size)

    def get_schedule_default_calendar_url(self):
        """Return default calendar URL.

        None indicates there is no default URL.
        """
        return None


class ScheduleOutbox(webdav.Collection):
    resource_types = webdav.Collection.resource_types + [SCHEDULE_OUTBOX_RESOURCE_TYPE]

    def get_supported_calendar_components(self):
        """Return set of supported calendar components in this calendar.

        Returns: iterable over component names
        """
        raise NotImplementedError(self.get_supported_calendar_components)

    def get_supported_calendar_data_types(self):
        """Return supported calendar data types.

        Returns: iterable over (content_type, version) tuples
        """
        raise NotImplementedError(self.get_supported_calendar_data_types)

    def get_max_resource_size(self):
        """Return max resource size."""
        raise NotImplementedError(self.get_max_resource_size)

    def get_min_date_time(self):
        """Return minimum datetime property."""
        raise NotImplementedError(self.get_min_date_time)

    def get_max_date_time(self):
        """Return maximum datetime property."""
        raise NotImplementedError(self.get_max_date_time)

    def get_max_attendees_per_instance(self):
        """Return maximum number of attendees per instance."""
        raise NotImplementedError(self.get_max_attendees_per_instance)


class ScheduleInboxURLProperty(webdav.Property):
    """Schedule-inbox-URL property.

    See https://tools.ietf.org/html/rfc6638, section 2.2
    """

    name = "{%s}schedule-inbox-URL" % caldav.NAMESPACE
    resource_type = webdav.PRINCIPAL_RESOURCE_TYPE
    in_allprops = True

    async def get_value(self, href, resource, el, environ):
        el.append(webdav.create_href(resource.get_schedule_inbox_url(), href))


class ScheduleOutboxURLProperty(webdav.Property):
    """Schedule-outbox-URL property.

    See https://tools.ietf.org/html/rfc6638, section 2.1
    """

    name = "{%s}schedule-outbox-URL" % caldav.NAMESPACE
    resource_type = webdav.PRINCIPAL_RESOURCE_TYPE
    in_allprops = True

    async def get_value(self, href, resource, el, environ):
        el.append(webdav.create_href(resource.get_schedule_outbox_url(), href))


class CalendarUserAddressSetProperty(webdav.Property):
    """calendar-user-address-set property.

    See https://tools.ietf.org/html/rfc6638, section 2.4.1
    """

    name = "{%s}calendar-user-address-set" % caldav.NAMESPACE
    resource_type = webdav.PRINCIPAL_RESOURCE_TYPE
    in_allprops = False

    async def get_value(self, base_href, resource, el, environ):
        for href in resource.get_calendar_user_address_set():
            el.append(webdav.create_href(href, base_href))


class ScheduleTagProperty(webdav.Property):
    """schedule-tag property.

    See https://tools.ietf.org/html/rfc6638, section 3.2.10
    """

    name = "{%s}schedule-tag" % caldav.NAMESPACE
    in_allprops = False

    def supported_on(self, resource):
        return resource.get_content_type() == "text/calendar"

    async def get_value(self, base_href, resource, el, environ):
        el.text = resource.get_schedule_tag()


class CalendarUserTypeProperty(webdav.Property):
    """calendar-user-type property.

    See https://tools.ietf.org/html/rfc6638, section 2.4.2
    """

    name = "{%s}calendar-user-type" % caldav.NAMESPACE
    resource_type = webdav.PRINCIPAL_RESOURCE_TYPE
    in_allprops = False

    async def get_value(self, href, resource, el, environ):
        el.text = resource.get_calendar_user_type()


class ScheduleDefaultCalendarURLProperty(webdav.Property):
    """schedule-default-calendar-URL property.

    See https://tools.ietf.org/html/rfc6638, section-9.2
    """

    name = "{%s}schedule-default-calendar-URL" % caldav.NAMESPACE
    resource_type = SCHEDULE_INBOX_RESOURCE_TYPE
    in_allprops = True

    async def get_value(self, href, resource, el, environ):
        url = resource.get_schedule_default_calendar_url()
        if url is not None:
            el.append(webdav.create_href(url, href))
