from django.db import models
from django.core.validators import FileExtensionValidator


class Trainer(models.Model):
    first_name = models.CharField(max_length=100)
    last_name = models.CharField(max_length=100)
    club = models.ForeignKey('clubs.Club', on_delete=models.CASCADE, related_name='trainers')
    email = models.EmailField(blank=True)
    phone = models.CharField(max_length=50, blank=True)
    photo = models.ImageField(
        upload_to='trainers/photos/',
        null=True, blank=True,
        validators=[FileExtensionValidator(allowed_extensions=['jpg', 'jpeg', 'png', 'webp'])]
    )
    is_active = models.BooleanField(default=True)
    created_at = models.DateTimeField(auto_now_add=True)
    updated_at = models.DateTimeField(auto_now=True)

    class Meta:
        ordering = ['last_name', 'first_name']

    def __str__(self):
        return f"{self.first_name} {self.last_name}"


# Note: Name uniqueness per club is not enforced at the database level.
# If the same trainer works for multiple clubs, they would appear once per club.
# If unique names per club are required, add: unique_together = ['first_name', 'last_name', 'club']