from django.core.validators import RegexValidator
from django.db import models
from django.db.models import Index
from django.utils.translation import gettext_lazy as _


class Team(models.Model):
    name = models.CharField(
        max_length=255,
        verbose_name=_("name"),
        unique=True,
    )

    trigram = models.CharField(
        max_length=3,
        verbose_name=_("trigram"),
        help_text=_("The trigram must be composed of 3 uppercase letters."),
        unique=True,
        validators=[RegexValidator("[A-Z]{3}")],
    )

    access_code = models.CharField(
        max_length=6,
        verbose_name=_("access code"),
        help_text=_("The access code let other people to join the team."),
    )

    def __str__(self):
        return _("Team {name} ({trigram})").format(name=self.name, trigram=self.trigram)

    class Meta:
        verbose_name = _("team")
        verbose_name_plural = _("teams")
        indexes = [
            Index(fields=("trigram", )),
        ]


class Participation(models.Model):
    team = models.OneToOneField(
        Team,
        on_delete=models.CASCADE,
        verbose_name=_("team"),
    )

    problem = models.IntegerField(
        choices=[(i, _("Problem #{problem:d}").format(problem=i)) for i in range(1, 5)],
        null=True,
        default=None,
        verbose_name=_("problem number"),
    )

    solution = models.ForeignKey(
        "participation.Video",
        on_delete=models.SET_NULL,
        related_name="+",
        null=True,
        default=None,
        verbose_name=_("solution video"),
    )

    received_participation = models.OneToOneField(
        "participation.Participation",
        on_delete=models.PROTECT,
        related_name="sent_participation",
        null=True,
        default=None,
        verbose_name=_("received participation"),
    )

    synthesis = models.ForeignKey(
        "participation.Video",
        on_delete=models.SET_NULL,
        related_name="+",
        null=True,
        default=None,
        verbose_name=_("synthesis video"),
    )

    def __str__(self):
        return _("Participation of the team {name} ({trigram})").format(name=self.team.name, trigram=self.team.trigram)

    class Meta:
        verbose_name = _("participation")
        verbose_name_plural = _("participations")


class Video(models.Model):
    participation = models.ForeignKey(
        "participation.Participation",
        on_delete=models.CASCADE,
        verbose_name=_("participation"),
    )

    link = models.URLField(
        verbose_name=_("link"),
        help_text=_("The full video link."),
    )

    valid = models.BooleanField(
        null=True,
        default=None,
        verbose_name=_("valid"),
        help_text=_("The video got the validation of the administrators."),
    )

    def __str__(self):
        return _("Video of team {name} ({trigram})")\
            .format(name=self.participation.team.name, trigram = self.participation.team.trigram)

    class Meta:
        verbose_name = _("video")
        verbose_name_plural = _("videos")