from django.conf import settings
from django.contrib.auth.models import AbstractUser
from django.core.validators import MinValueValidator, MaxValueValidator
from django.db import models


class User(AbstractUser):
    ROLE_CHOICES = [
        ('STUDENT', 'Student'),
        ('ADMIN', 'Admin'),
    ]

    name = models.CharField(max_length=255, blank=True)
    email = models.EmailField(unique=True)
    role_type = models.CharField(max_length=20, choices=ROLE_CHOICES, default='STUDENT')
    created_at = models.DateTimeField(auto_now_add=True)

    USERNAME_FIELD = 'email'
    REQUIRED_FIELDS = ['username', 'name']

    def __str__(self):
        return self.email


class UserProfile(models.Model):
    user = models.OneToOneField(
        settings.AUTH_USER_MODEL,
        on_delete=models.CASCADE,
        related_name='profile'
    )
    degree = models.CharField(max_length=255, blank=True)
    semester = models.IntegerField(
        null=True, blank=True,
        validators=[MinValueValidator(1), MaxValueValidator(12)]
    )
    interests = models.TextField(blank=True)
    bio = models.TextField(blank=True)
    updated_at = models.DateTimeField(auto_now=True)

    def __str__(self):
        return f'Profile of {self.user.email}'