from django.db import models
from datetime import date

from ..models.instructors import Instructor

class Availability(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"
    )

    instructor = models.ForeignKey(
        Instructor,
        null=False,
        db_index=True,
        on_delete=models.CASCADE,
        verbose_name="Instructor Selection"
    )

    monday = models.BooleanField(
        default=True,
        null=False
    )

    tuesday = models.BooleanField(
        default=True,
        null=False
    )

    wednesday = models.BooleanField(
        default=True,
        null=False
    )

    thursday = models.BooleanField(
        default=True,
        null=False
    )

    friday = models.BooleanField(
        default=True,
        null=False
    )

    saturday = models.BooleanField(
        default=True,
        null=False
    )

    sunday = models.BooleanField(
        default=True,
        null=False
    )

    hours = models.DurationField(
        null=True,
        verbose_name="Available hours"
    )

    notes = models.TextField(
        max_length=140,
        null=True,
        blank=True
    )

    class Meta():
        verbose_name = "Instructor Availability"
        verbose_name_plural = "Instructor Availabilities"

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