from django.contrib.auth.models import AbstractUser
from django.db import models

class CustomUser(AbstractUser):
    email = models.EmailField(unique=True)
    phone = models.CharField(max_length=20, blank=True)

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

    @property
    def role(self):
        roles = []
        if hasattr(self, 'studentprofile'):
            roles.append("student")
        if hasattr(self, 'instructorprofile'):
            roles.append("instructor")
        if hasattr(self, 'adminprofile'):
            roles.append("admin")
        return roles

    def save(self, *args, **kwargs):
        if self.email:
            self.email = self.email.lower().strip()
        super().save(*args, **kwargs)

    class Meta:
        verbose_name = "บัญชีผู้ใช้งาน"
        verbose_name_plural = "บัญชีผู้ใช้งาน"

    def __str__(self):
        return self.email

class BaseRoleProfile(models.Model):
    user = models.OneToOneField(
        CustomUser,
        on_delete=models.CASCADE,
    )
    is_active = models.BooleanField(default=True)

    class Meta:
        abstract = True

class StudentProfile(BaseRoleProfile):
    interests = models.TextField(blank=True)

    class Meta:
        verbose_name = "ผู้เรียน"
        verbose_name_plural = "ผู้เรียน"

class InstructorProfile(BaseRoleProfile):
    bio = models.TextField(blank=True)
    expertise = models.CharField(max_length=200, blank=True)
    is_verified = models.BooleanField(default=False)

    class Meta:
        verbose_name = "ผู้สอน"
        verbose_name_plural = "ผู้สอน"

    def __str__(self):
        return f"Instructor: {self.user.email}"

class AdminProfile(BaseRoleProfile):
    is_super = models.BooleanField(default=False)

    class Meta:
        verbose_name = "ผู้ดูแลระบบ"
        verbose_name_plural = "ผู้ดูแลระบบ"