import datetime as dt
import re
import string
import uuid
from urllib.parse import urlparse
from zoneinfo import ZoneInfo
import vobject
from django.conf import settings
from django.db import models
from django.utils.functional import cached_property
from django.utils.translation import gettext_lazy as _
from django_scopes import ScopedManager
from i18nfield.fields import I18nCharField
from pretalx.common.models.mixins import PretalxModel
from pretalx.common.text.serialize import serialize_duration
from pretalx.common.urls import get_base_url
INSTANCE_IDENTIFIER = None
[docs]
class TalkSlot(PretalxModel):
"""The TalkSlot object is the scheduled version of a.
:class:`~pretalx.submission.models.submission.Submission`.
TalkSlots always belong to one submission and one :class:`~pretalx.schedule.models.schedule.Schedule`.
:param is_visible: This parameter is set on schedule release. Only confirmed talks will be visible.
"""
submission = models.ForeignKey(
to="submission.Submission",
on_delete=models.PROTECT,
related_name="slots",
null=True,
blank=True, # If the submission is empty, this is a break or similar event
)
room = models.ForeignKey(
to="schedule.Room",
on_delete=models.PROTECT,
related_name="talks",
verbose_name=_("Room"),
help_text=_("The room this talk is scheduled in, if any"),
null=True,
blank=True,
)
schedule = models.ForeignKey(
to="schedule.Schedule", on_delete=models.PROTECT, related_name="talks"
)
is_visible = models.BooleanField(default=False)
start = models.DateTimeField(
null=True,
verbose_name=_("Start"),
help_text=_("When the talk starts, if it is currently scheduled"),
)
end = models.DateTimeField(
null=True,
verbose_name=_("End"),
help_text=_("When the talk ends, if it is currently scheduled"),
)
description = I18nCharField(null=True)
objects = ScopedManager(event="schedule__event")
class Meta:
ordering = ("start",)
def __str__(self):
"""Help when debugging."""
return f'TalkSlot(event={self.schedule.event.slug}, submission={getattr(self.submission, "title", None)}, schedule={self.schedule.version})'
@cached_property
def event(self):
return self.submission.event if self.submission else self.schedule.event
@property
def duration(self) -> int:
"""Returns the actual duration in minutes if the talk is scheduled, and
the planned duration in minutes otherwise."""
if self.start and self.end:
return int((self.end - self.start).total_seconds() / 60)
if not self.submission:
return None
return self.submission.get_duration()
@cached_property
def export_duration(self):
return serialize_duration(minutes=self.duration)
@cached_property
def pentabarf_export_duration(self):
duration = dt.timedelta(minutes=self.duration)
days = duration.days
hours = duration.total_seconds() // 3600 - days * 24
minutes = duration.seconds // 60 % 60
return f"{hours:02}{minutes:02}00"
@cached_property
def local_start(self):
if self.start:
return self.start.astimezone(self.event.tz)
@cached_property
def real_end(self):
"""Guaranteed to provide a useful end datetime if ``start`` is set,
even if ``end`` is empty."""
return self.end or (
self.start + dt.timedelta(minutes=self.duration) if self.start else None
)
@cached_property
def local_end(self):
if self.real_end:
return self.real_end.astimezone(self.event.tz)
@cached_property
def as_availability(self):
"""'Casts' a slot as.
:class:`~pretalx.schedule.models.availability.Availability`, useful for
availability arithmetic.
"""
from pretalx.schedule.models import Availability
return Availability(
start=self.start,
end=self.real_end,
)
[docs]
def copy_to_schedule(self, new_schedule, save=True):
"""Create a new slot for the given.
:class:`~pretalx.schedule.models.schedule.Schedule` with all other
fields identical to this one.
"""
new_slot = TalkSlot(schedule=new_schedule)
for field in (
fn for fn in self._meta.fields if fn.name not in ("id", "schedule")
):
setattr(new_slot, field.name, getattr(self, field.name))
if save:
new_slot.save()
return new_slot
copy_to_schedule.alters_data = True
[docs]
def is_same_slot(self, other_slot) -> bool:
"""Checks if both slots have the same room and start time."""
return self.room == other_slot.room and self.start == other_slot.start
@cached_property
def id_suffix(self):
if not self.event.get_feature_flag("present_multiple_times"):
return ""
all_slots = list(
TalkSlot.objects.filter(
submission_id=self.submission_id, schedule_id=self.schedule_id
).order_by("start")
)
if len(all_slots) == 1:
return ""
return "-" + str(all_slots.index(self))
@cached_property
def frab_slug(self):
title = re.sub(r"\W+", "-", self.submission.title)
legal_chars = string.ascii_letters + string.digits + "-"
pattern = f"[^{legal_chars}]+"
title = re.sub(pattern, "", title)
title = title.lower()
title = title.strip("_")
return f"{self.event.slug}-{self.submission.pk}{self.id_suffix}-{title}"
@cached_property
def uuid(self):
"""A UUID5, calculated from the submission code and the instance
identifier."""
global INSTANCE_IDENTIFIER
if not INSTANCE_IDENTIFIER:
from pretalx.common.models.settings import GlobalSettings
INSTANCE_IDENTIFIER = GlobalSettings().get_instance_identifier()
return uuid.uuid5(INSTANCE_IDENTIFIER, self.submission.code + self.id_suffix)
def build_ical(self, calendar, creation_time=None, netloc=None):
if not self.start or not self.local_end or not self.room or not self.submission:
return
creation_time = creation_time or dt.datetime.now(ZoneInfo("UTC"))
netloc = netloc or urlparse(get_base_url(self.event)).netloc
vevent = calendar.add("vevent")
vevent.add("summary").value = (
f"{self.submission.title} - {self.submission.display_speaker_names}"
)
vevent.add("dtstamp").value = creation_time
vevent.add("location").value = str(self.room.name)
vevent.add("uid").value = "pretalx-{}-{}{}@{}".format(
self.submission.event.slug, self.submission.code, self.id_suffix, netloc
)
vevent.add("dtstart").value = self.local_start
vevent.add("dtend").value = self.local_end
vevent.add("description").value = self.submission.abstract or ""
vevent.add("url").value = self.submission.urls.public.full()
def full_ical(self):
netloc = urlparse(settings.SITE_URL).netloc
cal = vobject.iCalendar()
cal.add("prodid").value = "-//pretalx//{}//{}".format(
netloc, self.submission.code
)
self.build_ical(cal)
return cal
