# SPDX-FileCopyrightText: 2017-present Tobias Kunze
# SPDX-License-Identifier: AGPL-3.0-only WITH LicenseRef-Pretalx-AGPL-3.0-Terms

from django.core.validators import RegexValidator
from django.db import models
from django.utils.text import slugify
from django.utils.translation import gettext_lazy as _
from i18nfield.fields import I18nCharField, I18nTextField

from pretalx.agenda.rules import is_agenda_visible
from pretalx.common.models.mixins import OrderedModel, PretalxModel
from pretalx.common.urls import EventUrls
from pretalx.event.rules import can_change_event_settings
from pretalx.submission.rules import (
    is_cfp_open,
    orga_can_change_submissions,
    use_tracks,
)


class Track(OrderedModel, PretalxModel):
    """A track groups :class:`~pretalx.submission.models.submission.Submission`
    objects within an :class:`~pretalx.event.models.event.Event`, e.g. by
    topic.

    :param color: The track colour, in the format #012345.
    """

    event = models.ForeignKey(
        to="event.Event", on_delete=models.PROTECT, related_name="tracks"
    )
    name = I18nCharField(
        max_length=200,
        verbose_name=_("Name"),
    )
    description = I18nTextField(
        verbose_name=_("Description"),
        blank=True,
    )
    color = models.CharField(
        max_length=7,
        verbose_name=_("Colour"),
        validators=[
            RegexValidator("#([0-9A-Fa-f]{3}){1,2}"),
        ],
    )
    position = models.PositiveIntegerField(
        null=True,
        blank=True,
        help_text="The position field is used to determine the order that tracks are displayed in (lowest first).",
    )
    requires_access_code = models.BooleanField(
        verbose_name=_("Requires access code"),
        help_text=_(
            "This track will only be shown to submitters with a matching access code."
        ),
        default=False,
    )

    log_prefix = "pretalx.track"

    class Meta:
        ordering = ("position",)
        rules_permissions = {
            "list": use_tracks & (is_agenda_visible | orga_can_change_submissions),
            "view": use_tracks
            & (is_cfp_open | is_agenda_visible | orga_can_change_submissions),
            "orga_list": use_tracks & orga_can_change_submissions,
            "orga_view": use_tracks & orga_can_change_submissions,
            "create": use_tracks & can_change_event_settings,
            "update": use_tracks & can_change_event_settings,
            "delete": use_tracks & can_change_event_settings,
        }

    class urls(EventUrls):
        base = edit = "{self.event.cfp.urls.tracks}{self.pk}/"
        delete = "{base}delete/"
        prefilled_cfp = "{self.event.cfp.urls.public}?track={self.slug}"

    def __str__(self) -> str:
        return str(self.name)

    @property
    def log_parent(self):
        return self.event

    @staticmethod
    def get_order_queryset(event):
        return event.tracks.all()

    @property
    def slug(self) -> str:
        """The slug makes tracks more readable in URLs.

        It consists of the ID, followed by a slugified (and, in lookups,
        optional) form of the track name.
        """
        return f"{self.id}-{slugify(self.name)}"
