# Generated by Django 3.0.7 on 2021-01-01 19:05

from django.db.models.fields.reverse_related import ManyToOneRel
from django.db.models import Q
from django.db import migrations, models
import django.db.models.deletion
from bookwyrm.management.commands.deduplicate_book_data import update_related


def convert_review_rating(app_registry, schema_editor):
    ''' take reviews with no content and turn them into ratings '''
    db_alias = schema_editor.connection.alias
    reviews = app_registry.get_model('bookwyrm', 'Review')
    review_ratings = app_registry.get_model('bookwyrm', 'ReviewRating')
    ratings = reviews.objects.using(db_alias).filter(
        Q(content__isnull=True) | Q(content=''))
    # replace the old review with the rating
    for review in ratings:
        rating = review_ratings.objects.create(
            user=review.user, rating=review.rating, book=review.book)
        for field in review._meta.get_fields():
            if isinstance(field, ManyToOneRel) or field.name == 'status_ptr':
                continue
            value = getattr(review, field.name)
            print(review, rating, field.name, value)
            try:
                setattr(rating, field.name, value)
            except TypeError:
                getattr(rating, field.name).set(value.all())
        rating.save()
        update_related(rating, review)
        review.delete()

class Migration(migrations.Migration):

    dependencies = [
        ('bookwyrm', '0029_auto_20201221_2014'),
    ]

    operations = [
        migrations.CreateModel(
            name='ReviewRating',
            fields=[
                ('review_ptr', models.OneToOneField(auto_created=True, on_delete=django.db.models.deletion.CASCADE, parent_link=True, primary_key=True, serialize=False, to='bookwyrm.Review')),
            ],
            options={
                'abstract': False,
            },
            bases=('bookwyrm.review',),
        ),
        migrations.RunPython(convert_review_rating),
    ]