import json
import requests
from django import forms
from django.urls import reverse
from django.apps import apps
from django.contrib.gis.geos import GEOSGeometry, fromstr, MultiPolygon
from django.contrib.gis.db import models
from django.contrib.sitemaps import Sitemap
from django.utils.safestring import mark_safe
from django.utils import timezone
from django.conf import settings

from utils.util import render_images, extract_main_image, markdown_to_html


"http://staticmap.openstreetmap.de/staticmap.php?center=object.location.geometry.centroid.y,object.location.geometry.centroid.x&zoom=14&size=1140x300&maptype=osmarenderer&markers=40.702147,-74.015794,lightblue1"


class Region(models.Model):
    """Model to define arbitrary regions based on where I've been"""
    name = models.CharField(max_length=50)
    slug = models.SlugField()
    pub_date = models.DateTimeField('Date published', null=True)
    geometry = models.MultiPolygonField(srid=4326, null=True)
    lon = models.FloatField('Longitude', help_text="Longitude of centerpoint", null=True)
    lat = models.FloatField('Latitude', help_text="Latitude of centerpoint", null=True)
    zoom_level = models.CharField(max_length=2, null=True)

    def get_absolute_url(self):
        return "/locations/region/%s/" % (self.slug)

    def __str__(self):
        return self.name


class Country(models.Model):
    """
    A geographic model based on the v3 of the simplified world borders multipolygon shapefile from http://thematicmapping.org/downloads/world_borders.php.
    """
    name = models.CharField(max_length=50)
    area = models.IntegerField(help_text="Area of Country in SQ meters")
    pop2005 = models.IntegerField('Population 2005')
    fips = models.CharField('FIPS Code', max_length=2, help_text=mark_safe('<a href="http://www.census.gov/geo/www/fips/fips.html">Federal Information Processing Standard Code</a>'))
    iso2 = models.CharField('2 Digit ISO', max_length=2, help_text=mark_safe('<a href="http://www.iso.org/">International Organization for Standardization</a>'))
    iso3 = models.CharField('3 Digit ISO', max_length=3, help_text=mark_safe('<a href="http://www.iso.org/">International Organization for Standardization</a>'))
    un = models.IntegerField('United Nations Code')
    REGION_CODES = (
        (0, 'MISC'),
        (2, 'Africa'),
        (9, 'Oceania'),
        (19, 'Americas'),
        (142, 'Asia'),
        (150, 'Europe'),
    )
    SUBREGION_CODES = (
        (0, 'MISC'),
        (5, 'South America'),
        (11, 'Western Africa'),
        (13, 'Central America'),
        (14, 'Eastern Africa'),
        (15, 'Northern Africa'),
        (17, 'Middle Africa'),
        (18, 'Southern Africa'),
        (21, 'North America'),
        (29, 'Caribbean'),
        (30, 'Eastern Asia'),
        (34, 'Southern Asia'),
        (35, 'Southeast Asia'),
        (39, 'Southern Europe'),
        (53, 'Australia and New Zealand'),
        (54, 'Melanesia'),
        (57, 'Micronesia'),
        (61, 'Polynesia'),
        (143, 'Central Asia'),
        (145, 'Western Asia'),
        (151, 'Eastern Europe'),
        (154, 'Northern Europe'),
        (155, 'Western Europe'),
    )
    region = models.IntegerField('Region Code', choices=REGION_CODES)
    subregion = models.IntegerField('Sub-Region Code', choices=SUBREGION_CODES)
    lon = models.FloatField('Longitude', help_text="Longitude of centerpoint")
    lat = models.FloatField('Latitude', help_text="Latitude of centerpoint")
    zoom_level = models.CharField(max_length=2, null=True)
    slug = models.SlugField(null=True)
    visited = models.BooleanField(default=False)
    lux_region = models.ForeignKey(Region, on_delete=models.CASCADE, null=True)
    pub_date = models.DateTimeField('Date published', null=True)
    geometry = models.MultiPolygonField('Country Border', srid=4326)

    class Meta:
        ordering = ['name']
        verbose_name_plural = 'Countries'

    def __str__(self):
        return self.name

    def get_absolute_url(self):
        return "/locations/%s/" % (self.slug)


class State(models.Model):
    """Model to hold state boundaries"""
    name = models.CharField(max_length=250, blank=True, null=True,)
    country = models.ForeignKey(Country, on_delete=models.CASCADE)
    slug = models.SlugField()
    code = models.CharField(max_length=2, null=True, blank=True)
    pub_date = models.DateTimeField('Date published', null=True)
    geometry = models.MultiPolygonField(srid=4326, null=True)

    class Meta:
        ordering = ['name']

    def __str__(self):
        return "%s" % (self.name)

    def get_absolute_url(self):
        return "/locations/%s/%s/" % (self.country.slug, self.slug)


class Location(models.Model):
    """
    Model to hold location shapes as arbitrarily defined by me
    """
    state = models.ForeignKey(State, on_delete=models.CASCADE)
    name = models.CharField(max_length=50, )
    slug = models.SlugField()
    pub_date = models.DateTimeField('Date published')
    geometry = models.MultiPolygonField(srid=4326)
    parent = models.ForeignKey('self', on_delete=models.CASCADE, blank=True, null=True)

    class Meta:
        ordering = ('-pub_date',)
        get_latest_by = 'pub_date'

    def __str__(self):
        return self.name

    def comma_name(self):
        if self.state.country.name == "United States":
            return self.state
        else:
            return self.state.country

    @property
    def get_previous_admin_url(self):
        return reverse('admin:%s_%s_change' %(self._meta.app_label,  self._meta.model_name),  args=[self.get_previous_by_pub_date().id] )

    @property
    def get_next_admin_url(self):
        model = apps.get_model(app_label=self._meta.app_label, model_name=self._meta.model_name)
        try:
            return reverse('admin:%s_%s_change' %(self._meta.app_label,  self._meta.model_name),  args=[self.get_next_by_pub_date().pk] )
        except model.DoesNotExist:
            return ''

    def get_absolute_url(self):
        return "/locations/%s/%s/%s/" % (self.state.country.slug, self.state.slug, self.slug)


class Route(models.Model):
    """Model to hold routes for longer trips"""
    name = models.CharField(max_length=200)
    slug = models.SlugField()
    zoom = models.CharField(max_length=2, null=True)
    template_var_name = models.CharField(max_length=10, null=True)
    pub_date = models.DateTimeField('Date published', null=True)
    geometry = models.MultiPointField(srid=4326)

    def get_absolute_url(self):
        return "/locations/%s/%s/%s/" % (self.slug)

    def __str__(self):
        return self.name


class CheckIn(models.Model):
    point = models.PointField(blank=True)
    location = models.ForeignKey(Location, on_delete=models.CASCADE, blank=True, null=True)
    date = models.DateField(default=timezone.now)

    class Meta:
        ordering = ('-date',)
        get_latest_by = 'date'

    def __str__(self):
        return str(self.date)

    @property
    def lon(self):
        '''Get the site's longitude.'''
        return self.point.x

    @property
    def lat(self):
        '''Get the site's latitude.'''
        return self.point.y

    def save(self):
        try:
            self.location = Location.objects.filter(geometry__contains=self.point).get()
        except Location.DoesNotExist:
            raise forms.ValidationError("There is no location associated with that point, add it:  %sadmin/locations/location/add/" % (settings.BASE_URL))
        super(CheckIn, self).save()


class Campsite(models.Model):
    name = models.CharField(max_length=200)
    point = models.PointField(blank=True)
    location = models.ForeignKey(Location, on_delete=models.CASCADE, blank=True, null=True)
    date_arrived = models.DateField(default=timezone.now)
    date_left = models.DateField(default=timezone.now, null=True, blank=True)
    CAMPSITE_TYPE = (
        (0, 'National Park'),
        (1, 'National Forest'),
        (2, 'National Other'),
        (3, 'State Park'),
        (4, 'State Forest'),
        (5, 'County Park'),
        (6, 'City Park'),
        (7, 'Boondocking'),
        (8, 'Other'),
    )
    campsite_type = models.IntegerField(choices=CAMPSITE_TYPE, default=0)
    campsite_number = models.IntegerField(blank=True, null=True)
    campsite_price = models.IntegerField(blank=True, null=True)
    campsite_we_wish_we_had = models.IntegerField(blank=True, null=True)
    body_markdown = models.TextField(blank=True, null=True)
    body_html = models.TextField(blank=True, null=True)
    image = models.ForeignKey("photos.LuxImage", on_delete=models.CASCADE, null=True, blank=True)

    class Meta:
        ordering = ('-date_arrived',)
        get_latest_by = 'date_arrived'

    def __str__(self):
        return "%s - %s" % (self.name, self.location)

    @property
    def lon(self):
        '''Get the site's longitude.'''
        return self.point.x

    @property
    def lat(self):
        '''Get the site's latitude.'''
        return self.point.y

    @property
    def nights_stayed(self):
        '''Get the number of nights we spent there '''
        delta = self.date_left - self.date_arrived
        return delta.days

    @property
    def total_price(self):
        '''Get the price and total price for display in admin  '''
        if not self.campsite_price:
            price = 0
            total = 0
        else:
            price = self.campsite_price
            total = self.nights_stayed * price
        return "${0} (${1})".format(price, total)

    def save(self, *args, **kwargs):
        created = self.pk is None
        if not created:
            md = render_images(self.body_markdown)
            self.body_html = markdown_to_html(md)
        try:
            self.location = Location.objects.filter(geometry__contains=self.point).get()
        except Location.DoesNotExist:
            raise forms.ValidationError("There is no location associated with that point, add it:  %sadmin/locations/location/add/" % (settings.BASE_URL))

        main_image = extract_main_image(self.body_markdown)
        if main_image:
            self.image = main_image
        super(Campsite, self).save(*args, **kwargs)


class WritingbyCountrySitemap(Sitemap):
    changefreq = "weekly"
    priority = 0.6
    protocol = "https"

    def location(self, item):
        return '/jrnl/%s' % item.slug

    def items(self):
        return Country.objects.filter(visited=True)


def get_bounds(lat, lon):
    '''
    given a set of lat,lon coords return the nearest administrative level boundary (usually turn out to be city, but sometimes it's a county, occasionally a state)
    '''
    r = requests.get('http://nominatim.openstreetmap.org/reverse',
                     params={
                         'lat': lat,
                         'lon': lon,
                         'accept-language': 'en',
                         'format': 'json'
                     })
    r.raise_for_status()
    data = json.loads(r.text)
    adr = data.get('address', {})
    city = adr.get('hamlet') or adr.get('village') or adr.get('town') or adr.get('city')
    state = adr.get('state')
    country = adr.get('country')
    r = requests.get('http://nominatim.openstreetmap.org/search',
                     params={
                         'city': city,
                         'state': state,
                         'country': country,
                         'polygon_text': 1,
                         'format': 'json',
                         'featuretype': 'neighborhood'
                     })
    r.raise_for_status()
    data = json.loads(r.text)
    poly = GEOSGeometry(data[0]['geotext'])
    # Sometimes you get a multipolygon, sometimes just a polygon
    if poly.geom_type == 'Polygon':
        poly = MultiPolygon(fromstr(data[0]['geotext']))
    return poly