from django.db import models
from django.utils import timezone
from django.conf import settings
from django.contrib.auth.models import Group

import datetime

import textwrap


class TaskList(models.Model):
    name = models.CharField(max_length=60, verbose_name='nom')
    slug = models.SlugField(null=False, blank=False, unique=True)
    groups = models.ManyToManyField(Group, verbose_name='groupe', blank=True)

    @property
    def completed_task_set(self):
        return self.task_set.filter(completed_date__isnull=False)

    @property
    def uncompleted_task_set(self):
        return self.task_set.filter(completed_date__isnull=True)

    def __str__(self):
        return self.name

    class Meta:
        ordering = ['name']
        verbose_name = 'liste de tâches'
        verbose_name_plural = 'listes de tâches'


class Task(models.Model):
    title = models.CharField(max_length=140, verbose_name='titre')
    task_list = models.ForeignKey(TaskList, on_delete=models.PROTECT)
    created_date = models.DateField(default=timezone.now, blank=True, null=True)
    due_date = models.DateField(blank=True, null=True, verbose_name='due pour le')
    completed_date = models.DateField(blank=True, null=True)
    created_by = models.ForeignKey(
        settings.AUTH_USER_MODEL,
        on_delete=models.PROTECT,
        related_name='created_task_set',
        verbose_name='créée par',
    )
    assigned_to = models.ForeignKey(
        settings.AUTH_USER_MODEL,
        blank=True,
        null=True,
        on_delete=models.SET_NULL,
        related_name='assigned_task_set',
        verbose_name='assignée à',
    )
    note = models.TextField(blank=True, null=True)
    priority = models.PositiveIntegerField(blank=True, null=True)

    def overdue_status(self):
        "Returns whether the Tasks's due date has passed or not."
        if self.due_date and datetime.date.today() > self.due_date:
            return True

    def __str__(self):
        return self.title

    class Meta:
        ordering = ['priority', 'created_date']
        verbose_name = 'tâche'
        verbose_name_plural = 'tâches'


class TaskComment(models.Model):
    author = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.PROTECT)
    task = models.ForeignKey(Task, on_delete=models.CASCADE, related_name='comments')
    date = models.DateTimeField(default=timezone.now)
    body = models.TextField(blank=True)

    @property
    def snippet(self):
        body_snippet = textwrap.shorten(self.body, width=35, placeholder="...")
        return "{author} - {snippet}...".format(author=str(self.author), snippet=body_snippet)

    def __str__(self):
        return self.snippet