from django.db import models
from django.contrib.auth.models import User
from django.utils.translation import gettext_lazy as _

from lib.models.base import MetaDataModel
from apps.hospital.models import Hospital
from apps.polyclinic.models import Polyclinic

# Create your models here.
class Employee(MetaDataModel):
    """
    A model that holds the employee information that is not available in the normal user model. It has a One To One relation with the Djano User model
    It will inherit the attributes :attr:`~lib.models.base.MetaDataModel.created_at` and :attr:`~lib.models.base.MetaDataModel.updated_at` from the Abstract model :class:`~lib.models.base.MetaDataModel`

    Attributes
    ----------
    user : User
        The Django user in the system where this employee data belongs to.
    hospital : Hospital
        The hospital where this employee is working. You can only choose **one** hospital per employee.
    polyclinic : Polyclinic
        The polyclinic where this employee is working within the hospital. It is possible to have / work for multiple polyclinics.
    phone : str
        Holds the direct phone number of this employee. Max length is 20 characters.
    """

    class Meta:
        verbose_name = _('employee')
        verbose_name_plural = _('employees')

    user = models.OneToOneField(User, on_delete=models.CASCADE, help_text=_('Django user'))

    hospital = models.ForeignKey(Hospital, on_delete=models.CASCADE, help_text=_('Select the hospital for this employee'))

    polyclinic = models.ManyToManyField(Polyclinic, blank=True, help_text=_('Select the polyclinic(s) for this employee'))
    phone = models.CharField(_('Phone number'), max_length=20, blank=True, help_text=_('The direct phone number of this employee'))

    def __str__(self):
        """str: Returns a readable name for the employee. Format is [employee_full_name] ([city])."""
        return '{} ({})'.format(self.user.get_full_name(), self.hospital)