''' progress in a book '''
from django.db import models
from django.utils import timezone
from django.core import validators

from .base_model import BookWyrmModel

class ProgressMode(models.TextChoices):
    PAGE = 'PG', 'page'
    PERCENT = 'PCT', 'percent'

class ReadThrough(BookWyrmModel):
    ''' Store a read through a book in the database. '''
    user = models.ForeignKey('User', on_delete=models.PROTECT)
    book = models.ForeignKey('Edition', on_delete=models.PROTECT)
    progress = models.IntegerField(
        validators=[validators.MinValueValidator(0)],
        null=True,
        blank=True)
    progress_mode = models.CharField(
        max_length=3,
        choices=ProgressMode.choices,
        default=ProgressMode.PAGE)
    start_date = models.DateTimeField(
        blank=True,
        null=True)
    finish_date = models.DateTimeField(
        blank=True,
        null=True)

    def save(self, *args, **kwargs):
        ''' update user active time '''
        self.user.last_active_date = timezone.now()
        self.user.save()
        super().save(*args, **kwargs)

    def create_update(self):
        if self.progress:
            return self.progressupdate_set.create(
                user=self.user,
                progress=self.progress,
                mode=self.progress_mode)

class ProgressUpdate(BookWyrmModel):
    ''' Store progress through a book in the database. '''
    user = models.ForeignKey('User', on_delete=models.PROTECT)
    readthrough = models.ForeignKey('ReadThrough', on_delete=models.CASCADE)
    progress = models.IntegerField(validators=[validators.MinValueValidator(0)])
    mode = models.CharField(
        max_length=3,
        choices=ProgressMode.choices,
        default=ProgressMode.PAGE)

    def save(self, *args, **kwargs):
        ''' update user active time '''
        self.user.last_active_date = timezone.now()
        self.user.save()
        super().save(*args, **kwargs)