from django.db import models
from simple_history.models import HistoricalRecords


class Conference(models.Model):
    """
    Conference within a sport (e.g., Eastern, Western for NBA).
    """
    sport = models.ForeignKey(
        'core.Sport',
        on_delete=models.CASCADE,
        related_name='conferences'
    )
    canonical_id = models.CharField(
        max_length=100,
        blank=True,
        db_index=True,
        help_text='Canonical ID from bootstrap JSON (e.g., nba_eastern)'
    )
    name = models.CharField(max_length=50)
    short_name = models.CharField(
        max_length=10,
        blank=True,
        help_text='Short name (e.g., East, West)'
    )
    order = models.PositiveSmallIntegerField(
        default=0,
        help_text='Display order'
    )

    # Metadata
    created_at = models.DateTimeField(auto_now_add=True)
    updated_at = models.DateTimeField(auto_now=True)

    # Audit trail
    history = HistoricalRecords()

    class Meta:
        ordering = ['sport', 'order', 'name']
        unique_together = ['sport', 'name']
        verbose_name = 'Conference'
        verbose_name_plural = 'Conferences'

    def __str__(self):
        return f"{self.sport.short_name} - {self.name}"


class Division(models.Model):
    """
    Division within a conference (e.g., Atlantic, Central for NBA East).
    """
    conference = models.ForeignKey(
        Conference,
        on_delete=models.CASCADE,
        related_name='divisions'
    )
    canonical_id = models.CharField(
        max_length=100,
        blank=True,
        db_index=True,
        help_text='Canonical ID from bootstrap JSON (e.g., nba_southeast)'
    )
    name = models.CharField(max_length=50)
    short_name = models.CharField(
        max_length=10,
        blank=True,
        help_text='Short name'
    )
    order = models.PositiveSmallIntegerField(
        default=0,
        help_text='Display order'
    )

    # Metadata
    created_at = models.DateTimeField(auto_now_add=True)
    updated_at = models.DateTimeField(auto_now=True)

    # Audit trail
    history = HistoricalRecords()

    class Meta:
        ordering = ['conference', 'order', 'name']
        unique_together = ['conference', 'name']
        verbose_name = 'Division'
        verbose_name_plural = 'Divisions'

    def __str__(self):
        return f"{self.conference.sport.short_name} - {self.conference.name} - {self.name}"

    @property
    def sport(self):
        return self.conference.sport