from decimal import Decimal
from secrets import token_urlsafe

from django.db import models
from django.utils.translation import gettext_lazy as _
from django_scopes import ScopedManager


def generate_token():
    return token_urlsafe(32)


class MusicrateSettings(models.Model):
    event = models.OneToOneField(
        to="event.Event",
        on_delete=models.CASCADE,
        related_name="pretalx_musicrate_settings",
    )
    submission_types = models.ManyToManyField(
        to="submission.SubmissionType",
        related_name="pretalx_musicrate_settings",
        help_text=_(
            "You can limit pretalx-musicrate to some session types. Leave this field empty to rate all session types."
        ),
        verbose_name=_("Session Types"),
        blank=True,
    )
    genre_question = models.OneToOneField(
        to="submission.Question",
        on_delete=models.SET_NULL,
        related_name="pretalx_musicrate_settings_genre",
        verbose_name=_("Genre Question"),
        blank=True,
        null=True,
    )
    origin_question = models.OneToOneField(
        to="submission.Question",
        on_delete=models.SET_NULL,
        related_name="pretalx_musicrate_settings_origin",
        verbose_name=_("Origin Question"),
        blank=True,
        null=True,
    )
    join_token = models.CharField(max_length=43, default=generate_token)
    advance_threshold = models.DecimalField(
        max_digits=3,
        decimal_places=2,
        default=Decimal("0.6"),
        help_text=_(
            "The fraction of jurors that has to submit a rating before the presenter view automatically advances to the next submission."
        ),
        verbose_name=_("Advance Threshold"),
    )
    last_submission = models.ForeignKey(
        "submission.Submission",
        on_delete=models.SET_NULL,
        related_name="pretalx_musicrate_settings",
        null=True,
    )
    link_questions = models.ManyToManyField(
        to="submission.Question",
        related_name="pretalx_musicrate_settings_links",
        verbose_name=_("Link Questions"),
        blank=True,
    )


class Juror(models.Model):
    objects = ScopedManager(event="event")

    event = models.ForeignKey(
        "event.Event", on_delete=models.CASCADE, related_name="jurors"
    )
    token = models.CharField(max_length=43, default=generate_token, primary_key=True)
    last_submission = models.ForeignKey(
        "submission.Submission",
        on_delete=models.SET_NULL,
        related_name="jurors",
        null=True,
    )


class Rating(models.Model):
    RATING_CHOICES = [
        ("10", "sehr gut"),
        ("9", "ziemlich gut"),
        ("8", "gut"),
        ("7", "eher gut"),
        ("6", "ok"),
        ("5", "naja"),
        ("4", "eher schlecht"),
        ("3", "schlecht"),
        ("2", "ziemlich schlecht"),
        ("1", "sehr schlecht"),
    ]
    rating = models.CharField(max_length=2, choices=RATING_CHOICES, blank=True)
    submission = models.ForeignKey(
        "submission.Submission", on_delete=models.CASCADE, related_name="ratings"
    )
    juror = models.ForeignKey(Juror, on_delete=models.CASCADE, related_name="ratings")

    class Meta:
        constraints = [
            models.UniqueConstraint(
                fields=("submission", "juror"), name="unique_rating"
            ),
        ]