"""Schema 6: tracing is a symbol.

A face's `:head :trace` is gone: its footage is a placement of a `:type :trace`
symbol under the head, the trace keys are that placement's `:time :holds`, and the
head follows them with `:reads`. Nothing is converted. Every project is marked 6,
and one that still carries a `:trace` is refused when it is opened, by name and
with what to do about it; the rest open as they did.

Images are stills to trace over, stored like sounds.
"""

import uuid

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


def forwards(apps, schema_editor):
    apps.get_model("clips", "Project").objects.update(schema_version=6)


class Migration(migrations.Migration):
    dependencies = [("clips", "0014_multiple_analyses")]

    operations = [
        migrations.CreateModel(
            name="Image",
            fields=[
                ("id", models.UUIDField(default=uuid.uuid4, editable=False,
                                        primary_key=True, serialize=False)),
                ("filename", models.CharField(max_length=255)),
                ("label", models.CharField(
                    blank=True, max_length=200,
                    help_text="what a person called it; the filename when empty")),
                ("width", models.PositiveIntegerField(help_text="pixels, as ffprobe reports them")),
                ("height", models.PositiveIntegerField()),
                ("created", models.DateTimeField(auto_now_add=True)),
                ("blob", models.ForeignKey(on_delete=django.db.models.deletion.PROTECT,
                                           related_name="image_for", to="clips.blob")),
            ],
        ),
        migrations.AlterField(
            model_name="project",
            name="schema_version",
            field=models.PositiveIntegerField(default=6),
        ),
        migrations.RunPython(forwards, migrations.RunPython.noop),
    ]