# Generated by Django 2.1 on 2018-08-31 13:17

import django.db.models.deletion
import jsonfield.encoder
import jsonfield.fields
from django.db import migrations, models


def copy_motion_version_content_to_motion(apps, schema_editor):
    """
    Move all motion version content of the active version to the motion.
    """
    Motion = apps.get_model('motions', 'Motion')

    for motion in Motion.objects.all():
        motion.title = motion.active_version.title
        motion.text = motion.active_version.text
        motion.reason = motion.active_version.reason
        motion.modified_final_version = motion.active_version.modified_final_version
        motion.amendment_paragraphs = motion.active_version.amendment_paragraphs
        motion.save(skip_autoupdate=True)


def migrate_active_change_recommendations(apps, schema_editor):
    """
    Delete all change recommendation of motion versions, that are not active. For active
    change recommendations the motion id will be set.
    """
    MotionChangeRecommendation = apps.get_model('motions', 'MotionChangeRecommendation')
    to_delete = []
    for cr in MotionChangeRecommendation.objects.all():
        # chack if version id matches the active version of the motion
        if cr.motion_version.id == cr.motion_version.motion.active_version.id:
            cr.motion = cr.motion_version.motion
            cr.save(skip_autoupdate=True)
        else:
            to_delete.append(cr)

    # delete non active change recommendations
    for cr in to_delete:
        cr.delete(skip_autoupdate=True)


class Migration(migrations.Migration):

    dependencies = [
        ('motions', '0010_auto_20180822_1042'),
    ]

    operations = [
        # Create new fields. Title and Text have empty defaults, but the values
        # should be overwritten by copy_motion_version_content_to_motion. In the next
        # migration file these defaults are removed.
        migrations.AddField(
            model_name='motion',
            name='title',
            field=models.CharField(max_length=255, default=''),
        ),
        migrations.AddField(
            model_name='motion',
            name='text',
            field=models.TextField(default=''),
        ),
        migrations.AddField(
            model_name='motion',
            name='reason',
            field=models.TextField(blank=True, null=True),
        ),
        migrations.AddField(
            model_name='motion',
            name='modified_final_version',
            field=models.TextField(blank=True, null=True),
        ),
        migrations.AddField(
            model_name='motion',
            name='amendment_paragraphs',
            field=jsonfield.fields.JSONField(
                dump_kwargs={
                    'cls': jsonfield.encoder.JSONEncoder,
                    'separators': (',', ':')
                },
                load_kwargs={},
                null=True),
        ),

        # Copy old motion version data
        migrations.RunPython(copy_motion_version_content_to_motion),

        # Change recommendations
        migrations.AddField(
            model_name='motionchangerecommendation',
            name='motion',
            field=models.ForeignKey(
                on_delete=django.db.models.deletion.CASCADE,
                null=True,  # This is reverted in the next migration
                related_name='change_recommendations',
                to='motions.Motion'),
        ),
        migrations.RunPython(migrate_active_change_recommendations),
        migrations.RemoveField(
            model_name='motionchangerecommendation',
            name='motion_version',
        ),

        # remove motion version references from motion and state.
        migrations.RemoveField(
            model_name='motion',
            name='active_version',
        ),
        migrations.AlterUniqueTogether(
            name='motionversion',
            unique_together=set(),
        ),
        migrations.RemoveField(
            model_name='motionversion',
            name='motion',
        ),
        migrations.RemoveField(
            model_name='state',
            name='leave_old_version_active',
        ),
        migrations.RemoveField(
            model_name='state',
            name='versioning',
        ),

        # Delete motion version.
        migrations.DeleteModel(
            name='MotionVersion',
        ),
    ]