from django.contrib.auth.models import User
from django.core.exceptions import ValidationError
from django.db import models
from django_choices_field.fields import TextChoicesField
from core.models import Customer
from core.models.base import Contact
from core.models.enums import StatusChoices, RoleChoices


class Profile(Contact):
    """Base profile class with common functionality"""
    user = models.OneToOneField(
        User, on_delete=models.SET_NULL, related_name='%(class)s',
        null=True, blank=True,
        help_text="Optional Django user for admin access only"
    )
    status = TextChoicesField(choices_enum=StatusChoices, default=StatusChoices.ACTIVE,
                              help_text="Current status of the profile")
    notes = models.TextField(blank=True, default="", verbose_name="Notes")
    ory_kratos_id = models.CharField(
        max_length=255, unique=True, null=True, blank=True,
        verbose_name="Ory Kratos Identity ID",
        help_text="Unique identifier from Ory Kratos authentication system"
    )
    email = models.EmailField(null=True, blank=True)

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

    def save(self, *args, **kwargs):
        # Validate new users against existing profiles (if user is set)
        # Strict enforcement of one profile per user
        if not self.pk and self.user:
            profile_types = [CustomerProfile, TeamProfile]
            current_type = type(self)

            for profile_type in profile_types:
                if profile_type != current_type:
                    if profile_type.objects.filter(user=self.user).exists():
                        raise ValidationError(
                            f"User already has a {profile_type.__name__}. "
                            f"Cannot create {current_type.__name__}."
                        )
        super().save(*args, **kwargs)


class CustomerProfile(Profile):
    """External/public-facing customer accounts"""
    customers = models.ManyToManyField(
        Customer,
        related_name='profiles',
        blank=True,
        help_text="Customers this profile has access to"
    )

    class Meta:
        verbose_name = "Customer Profile"
        verbose_name_plural = "Customer Profiles"


class TeamProfile(Profile):
    """Internal team member accounts"""
    role = TextChoicesField(choices_enum=RoleChoices, default=RoleChoices.TEAM_MEMBER,
                            help_text="Role of the team member")

    class Meta:
        verbose_name = "Team Profile"
        verbose_name_plural = "Team Profiles"