import django.db.models.deletion
from django.db import migrations, models
from django.db.models import Q


class Migration(migrations.Migration):
    dependencies = [
        ("channels", "0001_initial"),
        ("tickets", "0014_customerreplytask_channel_approval"),
    ]

    operations = [
        migrations.AddField(
            model_name="channelmessage",
            name="customer_reply_task",
            field=models.ForeignKey(
                blank=True,
                null=True,
                on_delete=django.db.models.deletion.PROTECT,
                related_name="channel_messages",
                to="tickets.customerreplytask",
            ),
        ),
        migrations.AddField(
            model_name="channelmessage",
            name="reply_revision",
            field=models.PositiveIntegerField(blank=True, null=True),
        ),
        migrations.AddConstraint(
            model_name="channelmessage",
            constraint=models.UniqueConstraint(
                fields=("customer_reply_task", "reply_revision"),
                condition=Q(
                    direction="outbound",
                    customer_reply_task__isnull=False,
                ),
                name="unique_channel_reply_revision",
            ),
        ),
    ]