__copyright__ = "Copyright © Stichting SciPost (SciPost Foundation)"
__license__ = "AGPL v3"


import uuid as uuid_lib

from django.conf import settings
from django.contrib.postgres.fields import ArrayField, JSONField
from django.db import models
from django.urls import reverse
from django.utils import timezone

from ..managers import ComposedMessageQuerySet


class ComposedMessage(models.Model):
    """
    An outgoing email message.
    """

    STATUS_DRAFT = 'draft'
    STATUS_READY = 'ready'
    STATUS_RENDERED = 'rendered'
    STATUS_SENT = 'sent'
    STATUS_CHOICES = (
        (STATUS_DRAFT, 'Draft'),
        (STATUS_READY, 'Ready for sending'),
        (STATUS_RENDERED, 'Rendered'),
        (STATUS_SENT, 'Sent'),
    )

    uuid = models.UUIDField( # Used by the API to look up the record
        db_index=True,
        default=uuid_lib.uuid4,
        editable=False)

    author = models.ForeignKey(
        settings.AUTH_USER_MODEL,
        on_delete=models.PROTECT)

    created_on = models.DateTimeField(default=timezone.now)

    status = models.CharField(
        max_length=8,
        choices=STATUS_CHOICES,
        default=STATUS_DRAFT)

    from_account = models.ForeignKey(
        'apimail.EmailAccount',
        on_delete=models.PROTECT)

    to_recipient = models.EmailField()

    cc_recipients = ArrayField(
        models.EmailField(),
        blank=True, null=True)

    bcc_recipients = ArrayField(
        models.EmailField(),
        blank=True, null=True)

    subject = models.CharField(max_length=256)

    body_text = models.TextField(blank=True)
    body_html = models.TextField(blank=True)

    attachment_files = models.ManyToManyField(
        'apimail.AttachmentFile',
        blank=True)

    objects = ComposedMessageQuerySet.as_manager()

    class Meta:
        ordering = ['-created_on']

    def __str__(self):
        return '%s: %s (from %s to %s) [%s]' % (
            self.created_on,
            self.subject[:20],
            self.from_account.email,
            self.to_recipient,
            self.get_status_display())


class ComposedMessageAPIResponse(models.Model):
    """
    Mailgun API response upon action on ComposedMessage.
    """
    message = models.ForeignKey(
        'apimail.ComposedMessage',
        on_delete=models.CASCADE,
        related_name='api_responses')
    datetime = models.DateTimeField(default=timezone.now)
    status_code = models.PositiveSmallIntegerField()
    json = JSONField(default=dict)

    class Meta:
        ordering = ['-datetime']