import logging
import json

from django.core.management.base import BaseCommand
from django.contrib.gis.geos import GEOSGeometry, MultiPolygon

from geo.models import City, Region, Province, Country

logging.basicConfig(
    filename='logs/addgeo.log',
    filemode='w',
    format='%(levelname)s:%(message)s',
    level=logging.INFO,
    )

class Command(BaseCommand):

    def handle(self, *args, **kwargs):
        print('Deleting all instances of Country, Region, Province, City')
        logging.info('Deleting all instances of Country, Region, Province, City')
        City.objects.all().delete()
        Province.objects.all().delete()
        Region.objects.all().delete()
        Country.objects.all().delete()

        # create country for spain
        country = Country.objects.create(name='España')

        locations_file = 'datasets/locations.json'
        locations = json.loads(open(locations_file).read())

        # REGIONS

        geo_file='datasets/gadm36_ESP.json'    # geo boundary data for regions
        geo_data = json.loads(open(geo_file).read())

        logging.info("Starting Region creation")
        print("Starting Region creation")
        region_counter = 0
        for location in locations:
            if location['model'] == 'locations.region':
                logging.info(f"Creating Region instance {location['fields']['name']}...")
                new_region = None

                name = location['fields']['name']
                # Bypass for lack of geo data on ceuta and melilla
                if name in ('Ceuta', 'Melilla'):
                    new_region = Region.objects.create(name=name, country=country, id=location['pk'])
                    logging.info(f"Region {name} created (without GADM data)")
                else:
                    for feature in geo_data['features']:
                        if feature['properties']['NAME_1'] == name:
                            logging.debug(f"Region {name} found in GADM data")
                            # calculate geometry data
                            geom = GEOSGeometry(str(feature['geometry']))
                            if feature['geometry']['type'] == "MultiPolygon":
                                poly_list = []
                                for poly in geom:
                                    poly_list.append(poly)
                            else:
                                poly_list = geom
                            geom_geos = MultiPolygon(poly_list)
                            # create instance
                            new_region = Region.objects.create(
                                name=name, country=country, geo=geom_geos, id=location['pk']
                                )
                            logging.info(f"Region {name} created")
                            region_counter += 1
                            break
                if new_region is None:
                    logging.warning(f"No region named {name} found in  GADM data")

        # PROVINCES
        print("Starting Province creation")
        logging.info("Starting Province creation")
        province_counter = 0
        for location in locations:
            if location['model'] == 'locations.province':
                logging.info(f"Creating Province instance {location['fields']['name']}...")
                name = location['fields']['name']
                # get parent region
                parent_region = Region.objects.get(id=location['fields']['region'])
                Province.objects.create(name=name, region=parent_region, id=location['pk'])
                province_counter += 1

        # CITIES
        print("Starting City creation")
        logging.info("Starting City creation")
        city_counter = 0
        for location in locations:
            if location['model'] == 'locations.city':
                name = location['fields']['name']
                City.objects.create(name=name, province=Province.objects.get(id=location['fields']['province']), id=location['pk'])
                city_counter += 1

        logging.info(f"Region instances created: {region_counter}")
        logging.info(f"Province instances created: {province_counter}")
        logging.info(f"City instances created: {city_counter}")

        print(f"Region instances created: {region_counter}")
        print(f"Province instances created: {province_counter}")
        print(f"City instances created: {city_counter}")