# -*- coding: utf-8 -*-
# Generated by Django 1.10.4 on 2017-05-04 12:52
from __future__ import unicode_literals

from django.db import migrations


def merge_areas(apps, schema_editor):
    from shapely.ops import cascaded_union
    Level = apps.get_model('mapdata', 'Level')
    for level in Level.objects.all():
        level_areas = list(level.areas.all())
        while level_areas:
            current_area = level_areas.pop(0)
            while True:
                for area in level_areas[:]:
                    if area.geometry.intersects(current_area.geometry) and current_area.public == area.public:
                        current_area.geometry = cascaded_union([area.geometry, current_area.geometry])
                        current_area.save()
                        level_areas.remove(area)
                        area.delete()
                        break
                else:
                    break


class Migration(migrations.Migration):

    dependencies = [
        ('mapdata', '0044_auto_20170504_1023'),
    ]

    operations = [
        migrations.RunPython(merge_areas),
    ]