from __future__ import unicode_literals
from django.contrib.postgres.fields import DateTimeRangeField
from django.db import models
from django.utils.text import slugify

from utils.models import CreatedUpdatedModel


class EventType(CreatedUpdatedModel):
    """ Every event needs to have a type. """
    name = models.CharField(max_length=100)
    slug = models.SlugField()
    color = models.CharField(max_length=50)
    light_text = models.BooleanField(default=False)

    def __unicode__(self):
        return self.name


class Event(CreatedUpdatedModel):
    """ Something that is on the program one or more times. """
    title = models.CharField(max_length=255)
    slug = models.SlugField(blank=True, max_length=255)
    abstract = models.TextField()
    event_type = models.ForeignKey(EventType)
    camp = models.ForeignKey('camps.Camp', null=True)

    class Meta:
        ordering = ['title']

    def __unicode__(self):
        return self.title

    def save(self, **kwargs):
        if not self.slug:
            self.slug = slugify(self.title)
        super(Event, self).save(**kwargs)


class EventInstance(CreatedUpdatedModel):
    """ An instance of an event """
    event = models.ForeignKey('program.event', related_name='instances')
    when = DateTimeRangeField()

    class Meta:
        ordering = ['when']

    def __unicode__(self):
        return '%s (%s)' % (self.event, self.when)


class Speaker(CreatedUpdatedModel):
    """ A Person anchoring an event. """
    name = models.CharField(max_length=150)
    biography = models.TextField()
    picture = models.ImageField(null=True, blank=True)
    slug = models.SlugField(blank=True, max_length=255)
    events = models.ManyToManyField(
        Event,
        related_name='speakers',
        related_query_name='speaker',
        blank=True,
    )

    class Meta:
        ordering = ['name']

    def __unicode__(self):
        return self.name

    def save(self, **kwargs):
        if not self.slug:
            self.slug = slugify(self.name)
        super(Speaker, self).save(**kwargs)