from django.conf import settings
from django.contrib.postgres.fields import ArrayField
from django.db import models
from model_utils import Choices


class Progress(models.Model):
    hidden_lessons = ArrayField(
        models.UUIDField(verbose_name="Токен урока", unique=True, editable=False),
        default=[],
        verbose_name='Список скрытых уроков',
    )
    teacher = models.ForeignKey(to=settings.AUTH_USER_MODEL, verbose_name="Преподователь по умолчанию",
                                related_name='teacher_progress')
    user = models.ForeignKey(to=settings.AUTH_USER_MODEL, verbose_name='Студент')
    course_token = models.UUIDField(verbose_name="Токен курса", editable=False)
    is_finish = models.BooleanField(verbose_name="Окончен ли курс", default=False)

    def progress_status(self, sorted_token_list):
        """
        Возвращает порядок активной темы и урока или ничего

        :return: (topic_sort, lesson_sort) or None
        """

        token_list = [i.lesson_token for i in self.progresslesson_set.filter(status='done')]

        x = (1, 1)

        for idx_topic, lesson_list in enumerate(sorted_token_list):
            for idx_lesson, lesson_token in enumerate(lesson_list):
                if lesson_token in token_list:
                    x = None

                elif x is None:
                    x = (idx_topic+1, idx_lesson+1)

        return x

    def __str__(self):
        return '%s' % (self.user.email,)

    class Meta:
        verbose_name = 'Прогресс пользователя'
        verbose_name_plural = 'Прогресс пользователя'
        unique_together = (("user", "course_token"),)


class ProgressLesson(models.Model):
    STATUSES = Choices('start', 'done', 'wait', 'fail')

    progress = models.ForeignKey(to=Progress)
    lesson_token = models.UUIDField(verbose_name="Токен урока", editable=False)
    checker = models.ForeignKey(to=settings.AUTH_USER_MODEL, verbose_name="Преподователь", )
    finish_date = models.DateTimeField(verbose_name='Дата зачтения задания', blank=True, null=True)
    start_date = models.DateTimeField(verbose_name='Дата начала прохождения задания', auto_now_add=True)
    status = models.CharField(choices=STATUSES, default=STATUSES.start, max_length=20)
    comment_tokens = ArrayField(models.UUIDField(verbose_name="Токен комента", editable=False), default=[])

    def __str__(self):
        return self.progress.user.email

    class Meta:
        verbose_name = 'Прохождение уроков'
        verbose_name_plural = 'Прохождение урока'
        unique_together = ('progress', 'lesson_token')