import uuid

from django.db import models
from modelcluster.contrib.taggit import ClusterTaggableManager
from modelcluster.fields import ParentalKey
from modelcluster.models import ClusterableModel
from taggit.models import TaggedItemBase
from wagtail.admin.edit_handlers import FieldPanel
from wagtail.core.models import Site
from wagtail.core.utils import camelcase_to_underscore


class ContactTag(TaggedItemBase):
    content_object = ParentalKey(
        'birdsong.Contact', on_delete=models.CASCADE, related_name='tagged_items')


class Contact(ClusterableModel):
    id = models.UUIDField(
        primary_key=True, default=uuid.uuid4, editable=False)
    email = models.EmailField()
    tags = ClusterTaggableManager(through=ContactTag, blank=True)

    panels = [
        FieldPanel('email'),
        FieldPanel('tags'),
    ]

    def __str__(self):
        return self.email


class CampaignStatus(models.IntegerChoices):
    UNSENT = 0
    SENDING = 1
    SENT = 2
    FAILED = 3


class Campaign(models.Model):
    name = models.CharField(
        max_length=255, help_text='The name of the campaign')
    subject = models.TextField()
    sent_date = models.DateTimeField(blank=True, null=True)
    receipts = models.ManyToManyField(Contact, through='Receipt')
    status = models.IntegerField(choices=CampaignStatus.choices, default=CampaignStatus.UNSENT)

    panels = [
        FieldPanel('name'),
        FieldPanel('subject'),
    ]

    def __str__(self):
        return self.name

    def get_template(self, request):
        return "mail/%s.html" % (camelcase_to_underscore(self.__class__.__name__))

    def get_context(self, request, contact):
        site = Site.find_for_request(request)
        return {
            'self': self,
            'contact': contact,
            'site': site,
        }


class Receipt(models.Model):
    campaign = models.ForeignKey(Campaign, on_delete=models.CASCADE)
    contact = models.ForeignKey(Contact, on_delete=models.CASCADE)
    sent_date = models.DateTimeField(auto_now=True)
    success = models.BooleanField(default=False)