import json
import datetime

from django.conf import settings
from django.contrib import messages
from django.core.urlresolvers import reverse
from django.core.mail import send_mail
from django.core.signing import BadSignature
from django.http import (
    JsonResponse, HttpResponseBadRequest, HttpResponseForbidden,
    HttpResponseNotFound)
from django.shortcuts import render, redirect, get_object_or_404
from django.template.loader import get_template
from django.views.generic import View
import pytz

from .forms import ManageActionForm, PublicContribForm
from .models import Contrib
from .decorators import prevent_robots
from .tokens import ContribTokenManager, URLTokenManager, TokenError


@prevent_robots()
def add_contrib(request):
    if request.method == 'GET':
        form = PublicContribForm()
    elif request.method == 'POST':
        form = PublicContribForm(request.POST)

        if form.is_valid():
            contrib = form.save()
            # Send notification email to site administrator
            if len(settings.NOTIFICATION_EMAILS) > 0:
                context = {
                    'contrib_url': settings.SITE_URL + reverse('display_map') + '#{}'.format(contrib.id),
                    'contrib': contrib,
                }
                subject = get_template(
                admin_subject = get_template(
                    'contribmap/mails/new_contrib_moderator_notice.subject')
                admin_body = get_template(
                    'contribmap/mails/new_contrib_moderator_notice.txt')
                send_mail(
                    admin_subject.render(context),
                    admin_body.render(context),
                    settings.DEFAULT_FROM_EMAIL,
                    settings.NOTIFICATION_EMAILS,
                )

            return redirect(reverse('thanks'))
    return render(request, 'contribmap/wifi-form.html', {
        'form': form,
        'isp':settings.ISP,
    })


def manage_contrib(request, pk):
    """ Contribution management by the user itself

    Auth is done by signed token
    """
    try:
        token = request.GET['token']
    except KeyError:
        return HttpResponseForbidden(
            'Missing authorization token')
    pk = int(pk)

    try:
        contrib = ContribTokenManager().get_instance_if_allowed(token, pk)

    except TokenError:
        return HttpResponseForbidden(
            'Bad signature, or expired token')

    else:
        if not contrib:
            return HttpResponseNotFound("Inexistant Contrib")

        wanabe_expiration_date = contrib.get_postponed_expiration_date(
            datetime.datetime.now(pytz.utc))
        if request.POST:
            action_form = ManageActionForm(request.POST)
            if not action_form.is_valid():
                return HttpResponseBadRequest('Action invalide')

            action = action_form.cleaned_data['action']
            if action == action_form.ACTION_DELETE:
                contrib.delete()
                messages.add_message(
                    request, messages.INFO,
                    'Votre demande a bien été supprimée.')
                return redirect(reverse('display_map'))

            elif action == action_form.ACTION_RENEW:
                contrib.expiration_date = wanabe_expiration_date
                contrib.save()
                messages.add_message(
                    request, messages.INFO,
                    "Votre demande a été prolongée jusqu'au {:%d/%m/%Y}".format(
                        contrib.expiration_date))
            else:
                return HttpResponseBadRequest('Action invalide')

        return render(request, 'contribmap/manage_contrib.html', {
            'contrib': contrib,
            'wanabe_expiration_date': wanabe_expiration_date,
            'delete_form': ManageActionForm({
                'action': ManageActionForm.ACTION_DELETE
            }),
            'renew_form': ManageActionForm({
                'action': ManageActionForm.ACTION_RENEW
            }),
            'messages': messages.api.get_messages(request),
            'isp': settings.ISP,
        })


def display_map(request):
    private_mode = request.user.is_authenticated()
    if private_mode:
        json_url = reverse('private_json')
    else:
        json_url = reverse('public_json')

    return render(request, 'contribmap/map.html', {
        'private_mode': private_mode,
        'json_url': json_url,
        'isp':settings.ISP,
    })


def thanks(request):
    return render(request, 'contribmap/thanks.html', {
        'isp':settings.ISP,
    })

def legal(request):
    return render(request, 'contribmap/legal.html', {
        'isp':settings.ISP,
    })

class JSONContribView(View):
    def get(self, request):
        return JsonResponse({
            "id": self.ID,
            "license": self.LICENSE,
            "features": self.get_features(),
        })

    PLACE_PROPERTIES = [
        'floor', 'angles', 'orientations', 'roof', 'floor', 'floor_total']


class PublicJSON(JSONContribView):
    ID = 'public'
    LICENSE = {
        "type": "ODC-BY-1.0",
        "url": "http:\/\/opendatacommons.org\/licenses\/by\/1.0\/"
    }

    def get_features(self):
        contribs = Contrib.objects.all()

        data = []
        for i in contribs:
            if not i.is_public():
                continue
            data.append({
                "id": i.pk,
                "type": "Feature",
                "geometry": {
                    "coordinates": [
                        i.longitude,
                        i.latitude
                    ],
                    "type": "Point",
                },
                "properties": {
                    "contrib_type": i.contrib_type,
                    "name": i.get_public_field('name'),
                    "place": {
                        k: i.get_public_field(k) for k in self.PLACE_PROPERTIES
                    },
                    "comment": i.get_public_field('comment'),
                }
            })
        return data


class PrivateJSON(JSONContribView):
    ID = 'private'
    LICENSE = {
        "type": "Copyright",
    }

    def dispatch(self, request, *args, **kwargs):
        if hasattr(request, 'user') and request.user.is_staff:
            return super().dispatch(request, *args, **kwargs)
        else:
            return HttpResponseForbidden('Need staff access')

    def get_features(self):
        contribs = Contrib.objects.all()

        data = []
        for i in contribs:
            data.append({
                "id": i.pk,
                "type": "Feature",
                "geometry": {
                    "coordinates": [
                        i.longitude,
                        i.latitude,
                    ],
                    "type": "Point",
                },
                "properties": {
                    "contrib_type": i.contrib_type,
                    "name": i.name,
                    "place": {
                        k: getattr(i, k) for k in self.PLACE_PROPERTIES
                    },
                    "comment": i.comment,
                    "phone": i.phone,
                    "email": i.email
                }
            })
        return data