from django.db import models
from datetime import date

from ..models.students import Student

class WeekPreference(models.Model):
    id = models.BigAutoField(
        primary_key=True
    )

    week = models.PositiveSmallIntegerField(
        null=False,
        db_index=True,
        db_default=date.today().isocalendar().week,
        auto_created=True,
        verbose_name="Week Number"
    )

    student = models.ForeignKey(
        Student,
        null=False,
        db_index=True,
        on_delete=models.DO_NOTHING,
        verbose_name="Student Selection"
    )

    def __str__(self):
        return f"Week {self.week} - {self.student.surname} {self.student.name[0]}."