from datetime import datetime, timedelta
from collections import OrderedDict
import pytz

from django.shortcuts import render
from django.views.generic import ListView, DetailView, RedirectView, TemplateView
from django.views.generic.edit import UpdateView, CreateView, DeleteView, ProcessFormView, FormMixin
from django.forms.models import modelform_factory
from django.forms import CheckboxSelectMultiple
from django.utils.translation import ugettext as _
from django.utils import dateparse
from django.core.urlresolvers import reverse_lazy
from django.conf import settings
from django.db import transaction

from core.models import Page
from core.views import CanViewMixin, CanEditMixin, CanEditPropMixin, CanCreateMixin
from launderette.models import Launderette, Token, Machine, Slot
from subscription.views import get_subscriber

# For users

class LaunderetteMainView(TemplateView):
    """Main presentation view"""
    template_name = 'launderette/launderette_main.jinja'

    def get_context_data(self, **kwargs):
        """ Add page to the context """
        kwargs = super(LaunderetteMainView, self).get_context_data(**kwargs)
        kwargs['page'] = Page.objects.filter(name='launderette').first()
        return kwargs

class LaunderetteBookMainView(CanViewMixin, ListView):
    """Choose which launderette to book"""
    model = Launderette
    template_name = 'launderette/launderette_book_choose.jinja'

class LaunderetteBookView(CanViewMixin, DetailView):
    """Display the launderette schedule"""
    model = Launderette
    pk_url_kwarg = "launderette_id"
    template_name = 'launderette/launderette_book.jinja'

    def get(self, request, *args, **kwargs):
        self.slot_type = "BOTH"
        self.machines = {}
        return super(LaunderetteBookView, self).get(request, *args, **kwargs)

    def post(self, request, *args, **kwargs):
        self.slot_type = "BOTH"
        self.machines = {}
        with transaction.atomic():
            self.object = self.get_object()
            if 'slot_type' in request.POST.keys():
                self.slot_type = request.POST['slot_type']
            if 'slot' in request.POST.keys() and request.user.is_authenticated():
                self.subscriber = get_subscriber(request.user)
                if self.subscriber.is_subscribed():
                    self.date = dateparse.parse_datetime(request.POST['slot']).replace(tzinfo=pytz.UTC)
                    if self.slot_type == "WASHING":
                        if self.check_slot(self.slot_type):
                            Slot(user=self.subscriber, start_date=self.date, machine=self.machines[self.slot_type], type=self.slot_type).save()
                    elif self.slot_type == "DRYING":
                        if self.check_slot(self.slot_type):
                            Slot(user=self.subscriber, start_date=self.date, machine=self.machines[self.slot_type], type=self.slot_type).save()
                    else:
                        if self.check_slot("WASHING") and self.check_slot("DRYING", self.date + timedelta(hours=1)):
                            Slot(user=self.subscriber, start_date=self.date, machine=self.machines["WASHING"], type="WASHING").save()
                            Slot(user=self.subscriber, start_date=self.date + timedelta(hours=1),
                                    machine=self.machines["DRYING"], type="DRYING").save()
        return super(LaunderetteBookView, self).get(request, *args, **kwargs)

    def check_slot(self, type, date=None):
        if date is None: date = self.date
        for m in self.object.machines.filter(is_working=True, type=type).all():
            slot = Slot.objects.filter(start_date=date, machine=m).first()
            if slot is None:
                self.machines[type] = m
                return True
        return False

    @staticmethod
    def date_iterator(startDate, endDate, delta=timedelta(days=1)):
        currentDate = startDate
        while currentDate < endDate:
            yield currentDate
            currentDate += delta

    def get_context_data(self, **kwargs):
        """ Add page to the context """
        kwargs = super(LaunderetteBookView, self).get_context_data(**kwargs)
        kwargs['planning'] = OrderedDict()
        kwargs['slot_type'] = self.slot_type
        start_date = datetime.now().replace(hour=0, minute=0, second=0, microsecond=0, tzinfo=pytz.UTC)
        for date in LaunderetteBookView.date_iterator(start_date, start_date+timedelta(days=6), timedelta(days=1)):
            kwargs['planning'][date] = []
            for h in LaunderetteBookView.date_iterator(date, date+timedelta(days=1), timedelta(hours=1)):
                free = False
                if self.slot_type == "BOTH" and self.check_slot("WASHING", h) and self.check_slot("DRYING", h + timedelta(hours=1)):
                    print("GUY")
                    free = True
                elif self.slot_type == "WASHING" and self.check_slot("WASHING", h):
                    free = True
                elif self.slot_type == "DRYING" and self.check_slot("DRYING", h):
                    free = True
                if free and datetime.now().replace(tzinfo=pytz.UTC) < h:
                    kwargs['planning'][date].append(h)
                else:
                    kwargs['planning'][date].append(None)
                    print("Taken")
        return kwargs

# For admins

class LaunderetteListView(CanViewMixin, ListView):
    """Choose which launderette to administer"""
    model = Launderette
    template_name = 'launderette/launderette_list.jinja'

class LaunderetteDetailView(CanViewMixin, DetailView):
    """The admin page of the launderette"""
    model = Launderette
    pk_url_kwarg = "launderette_id"
    template_name = 'launderette/launderette_detail.jinja'

class LaunderetteEditView(CanViewMixin, UpdateView):
    """Edit a launderette"""
    model = Launderette
    pk_url_kwarg = "launderette_id"
    form_class = modelform_factory(Launderette, fields=['name', 'sellers'],
            widgets={'sellers':CheckboxSelectMultiple})
    template_name = 'core/edit.jinja'

class LaunderetteCreateView(CanCreateMixin, CreateView):
    """Create a new launderette"""
    model = Launderette
    fields = ['name']
    template_name = 'core/create.jinja'


class MachineEditView(CanEditPropMixin, UpdateView):
    """Edit a machine"""
    model = Machine
    pk_url_kwarg = "machine_id"
    fields = ['name', 'launderette', 'type', 'is_working']
    template_name = 'core/edit.jinja'

class MachineDeleteView(CanEditPropMixin, DeleteView):
    """Edit a machine"""
    model = Machine
    pk_url_kwarg = "machine_id"
    template_name = 'core/delete_confirm.jinja'
    success_url = reverse_lazy('launderette:launderette_list')

class MachineCreateView(CanCreateMixin, CreateView):
    """Create a new machine"""
    model = Machine
    fields = ['name', 'launderette', 'type']
    template_name = 'core/create.jinja'

    def get_initial(self):
        ret = super(MachineCreateView, self).get_initial()
        if 'launderette' in self.request.GET.keys():
            obj = Launderette.objects.filter(id=int(self.request.GET['launderette'])).first()
            if obj is not None:
                ret['launderette'] = obj.id
        return ret