import uuid

import django.db.models.deletion
from django.conf import settings
from django.db import migrations, models


class Migration(migrations.Migration):

    initial = True

    dependencies = [
        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
    ]

    operations = [
        migrations.CreateModel(
            name="Topic",
            fields=[
                (
                    "id",
                    models.UUIDField(
                        default=uuid.uuid4,
                        editable=False,
                        primary_key=True,
                        serialize=False,
                    ),
                ),
                ("created_at", models.DateTimeField(auto_now_add=True, db_index=True)),
                ("updated_at", models.DateTimeField(auto_now=True)),
                ("name", models.CharField(max_length=120)),
                ("slug", models.SlugField(max_length=140, unique=True)),
                ("description", models.TextField(blank=True)),
                (
                    "icon",
                    models.CharField(
                        blank=True,
                        help_text="Icon identifier for the frontend.",
                        max_length=64,
                    ),
                ),
                (
                    "order",
                    models.PositiveIntegerField(
                        default=0, help_text="Sort position among siblings."
                    ),
                ),
                (
                    "parent",
                    models.ForeignKey(
                        blank=True,
                        null=True,
                        on_delete=django.db.models.deletion.PROTECT,
                        related_name="children",
                        to="taxonomy.topic",
                    ),
                ),
            ],
            options={
                "ordering": ["order", "name"],
            },
        ),
        migrations.CreateModel(
            name="Tag",
            fields=[
                (
                    "id",
                    models.UUIDField(
                        default=uuid.uuid4,
                        editable=False,
                        primary_key=True,
                        serialize=False,
                    ),
                ),
                ("created_at", models.DateTimeField(auto_now_add=True, db_index=True)),
                ("updated_at", models.DateTimeField(auto_now=True)),
                ("name", models.CharField(max_length=80)),
                ("slug", models.SlugField(max_length=100, unique=True)),
                ("description", models.TextField(blank=True)),
                (
                    "is_curated",
                    models.BooleanField(
                        default=False,
                        help_text="Curated tags are protected from renaming/merging.",
                    ),
                ),
                ("usage_count", models.PositiveIntegerField(db_index=True, default=0)),
                (
                    "created_by",
                    models.ForeignKey(
                        blank=True,
                        null=True,
                        on_delete=django.db.models.deletion.SET_NULL,
                        related_name="+",
                        to=settings.AUTH_USER_MODEL,
                    ),
                ),
                (
                    "topic",
                    models.ForeignKey(
                        blank=True,
                        null=True,
                        on_delete=django.db.models.deletion.SET_NULL,
                        related_name="tags",
                        to="taxonomy.topic",
                    ),
                ),
            ],
            options={
                "ordering": ["-usage_count", "name"],
            },
        ),
        migrations.AddIndex(
            model_name="topic",
            index=models.Index(
                fields=["parent", "order"], name="topic_parent_order_idx"
            ),
        ),
        migrations.AddConstraint(
            model_name="topic",
            constraint=models.CheckConstraint(
                condition=models.Q(("parent__isnull", True))
                | ~models.Q(("parent", models.F("id"))),
                name="topic_not_own_parent",
            ),
        ),
    ]