# -*- coding: utf-8 -*-
from django.contrib import messages
from django.contrib.messages.views import SuccessMessageMixin
from django.forms import Form
from django.http import HttpResponseRedirect
from django.urls import reverse, reverse_lazy
from django.utils import timezone
from django.utils.translation import gettext as _
from django.views.generic.base import RedirectView, TemplateView
from django.views.generic.detail import DetailView
from django.views.generic.edit import CreateView, UpdateView, DeleteView, \
    FormView

from babybuddy.mixins import LoginRequiredMixin, PermissionRequiredMixin
from babybuddy.views import BabyBuddyFilterView
from core import forms, models, timeline


def _prepare_timeline_context_data(context, date, child=None):
    date = timezone.datetime.strptime(date, '%Y-%m-%d')
    date = timezone.localtime(timezone.make_aware(date))
    context['timeline_objects'] = timeline.get_objects(date, child)
    context['date'] = date
    context['date_previous'] = date - timezone.timedelta(days=1)
    if date.date() < timezone.localdate():
        context['date_next'] = date + timezone.timedelta(days=1)
    pass


class CoreAddView(PermissionRequiredMixin, SuccessMessageMixin, CreateView):
    def get_success_message(self, cleaned_data):
        cleaned_data['model'] = self.model._meta.verbose_name.title()
        if 'child' in cleaned_data:
            self.success_message = _('%(model)s entry for %(child)s added!')
        else:
            self.success_message = _('%(model)s entry added!')
        return self.success_message % cleaned_data

    def get_form_kwargs(self):
        """
        Check for and add "child" and "timer" from request query parameters.
          - "child" may provide a slug for a Child instance.
          - "timer" may provided an ID for a Timer instance.

        These arguments are used in some add views to pre-fill initial data in
        the form fields.

        :return: Updated keyword arguments.
        """
        kwargs = super(CoreAddView, self).get_form_kwargs()
        for parameter in ['child', 'timer']:
            value = self.request.GET.get(parameter, None)
            if value:
                kwargs.update({parameter: value})
        return kwargs


class CoreUpdateView(PermissionRequiredMixin, SuccessMessageMixin,
                     UpdateView):
    def get_success_message(self, cleaned_data):
        cleaned_data['model'] = self.model._meta.verbose_name.title()
        if 'child' in cleaned_data:
            self.success_message = _('%(model)s entry for %(child)s updated.')
        else:
            self.success_message = _('%(model)s entry updated.')
        return self.success_message % cleaned_data


class CoreDeleteView(PermissionRequiredMixin, DeleteView):
    """
    SuccessMessageMixin is not compatible DeleteView.
    See: https://code.djangoproject.com/ticket/21936
    """
    def delete(self, request, *args, **kwargs):
        success_message = _('%(model)s entry deleted.') % {
            'model': self.model._meta.verbose_name.title()
        }
        messages.success(request, success_message)
        return super(CoreDeleteView, self).delete(request, *args, **kwargs)


class ChildList(PermissionRequiredMixin, BabyBuddyFilterView):
    model = models.Child
    template_name = 'core/child_list.html'
    permission_required = ('core.view_child',)
    paginate_by = 10
    filterset_fields = ('first_name', 'last_name')


class ChildAdd(CoreAddView):
    model = models.Child
    permission_required = ('core.add_child',)
    form_class = forms.ChildForm
    success_url = reverse_lazy('core:child-list')
    success_message = _('%(first_name)s %(last_name)s added!')


class ChildDetail(PermissionRequiredMixin, DetailView):
    model = models.Child
    permission_required = ('core.view_child',)

    def get_context_data(self, **kwargs):
        context = super(ChildDetail, self).get_context_data(**kwargs)
        date = self.request.GET.get('date', str(timezone.localdate()))
        _prepare_timeline_context_data(context, date, self.object)
        return context


class ChildUpdate(CoreUpdateView):
    model = models.Child
    permission_required = ('core.change_child',)
    form_class = forms.ChildForm
    success_url = reverse_lazy('core:child-list')


class ChildDelete(CoreUpdateView):
    model = models.Child
    form_class = forms.ChildDeleteForm
    template_name = 'core/child_confirm_delete.html'
    permission_required = ('core.delete_child',)
    success_url = reverse_lazy('core:child-list')

    def get_success_message(self, cleaned_data):
        """ This class cannot use `CoreDeleteView` because of the confirmation
        step required so the success message must be overridden."""
        success_message = _('%(model)s entry deleted.') % {
            'model': self.model._meta.verbose_name.title()
        }
        return success_message % cleaned_data


class DiaperChangeList(PermissionRequiredMixin, BabyBuddyFilterView):
    model = models.DiaperChange
    template_name = 'core/diaperchange_list.html'
    permission_required = ('core.view_diaperchange',)
    paginate_by = 10
    filterset_fields = ('child', 'wet', 'solid', 'color')


class DiaperChangeAdd(CoreAddView):
    model = models.DiaperChange
    permission_required = ('core.add_diaperchange',)
    form_class = forms.DiaperChangeForm
    success_url = reverse_lazy('core:diaperchange-list')


class DiaperChangeUpdate(CoreUpdateView):
    model = models.DiaperChange
    permission_required = ('core.change_diaperchange',)
    form_class = forms.DiaperChangeForm
    success_url = reverse_lazy('core:diaperchange-list')


class DiaperChangeDelete(CoreDeleteView):
    model = models.DiaperChange
    permission_required = ('core.delete_diaperchange',)
    success_url = reverse_lazy('core:diaperchange-list')


class FeedingList(PermissionRequiredMixin, BabyBuddyFilterView):
    model = models.Feeding
    template_name = 'core/feeding_list.html'
    permission_required = ('core.view_feeding',)
    paginate_by = 10
    filterset_fields = ('child', 'type', 'method')


class FeedingAdd(CoreAddView):
    model = models.Feeding
    permission_required = ('core.add_feeding',)
    form_class = forms.FeedingForm
    success_url = reverse_lazy('core:feeding-list')


class FeedingUpdate(CoreUpdateView):
    model = models.Feeding
    permission_required = ('core.change_feeding',)
    form_class = forms.FeedingForm
    success_url = reverse_lazy('core:feeding-list')


class FeedingDelete(CoreDeleteView):
    model = models.Feeding
    permission_required = ('core.delete_feeding',)
    success_url = reverse_lazy('core:feeding-list')


class NoteList(PermissionRequiredMixin, BabyBuddyFilterView):
    model = models.Note
    template_name = 'core/note_list.html'
    permission_required = ('core.view_note',)
    paginate_by = 10
    filterset_fields = ('child',)


class NoteAdd(CoreAddView):
    model = models.Note
    permission_required = ('core.add_note',)
    form_class = forms.NoteForm
    success_url = reverse_lazy('core:note-list')


class NoteUpdate(CoreUpdateView):
    model = models.Note
    permission_required = ('core.change_note',)
    form_class = forms.NoteForm
    success_url = reverse_lazy('core:note-list')


class NoteDelete(CoreDeleteView):
    model = models.Note
    permission_required = ('core.delete_note',)
    success_url = reverse_lazy('core:note-list')


class SleepList(PermissionRequiredMixin, BabyBuddyFilterView):
    model = models.Sleep
    template_name = 'core/sleep_list.html'
    permission_required = ('core.view_sleep',)
    paginate_by = 10
    filterset_fields = ('child',)


class SleepAdd(CoreAddView):
    model = models.Sleep
    permission_required = ('core.add_sleep',)
    form_class = forms.SleepForm
    success_url = reverse_lazy('core:sleep-list')


class SleepUpdate(CoreUpdateView):
    model = models.Sleep
    permission_required = ('core.change_sleep',)
    form_class = forms.SleepForm
    success_url = reverse_lazy('core:sleep-list')


class SleepDelete(CoreDeleteView):
    model = models.Sleep
    permission_required = ('core.delete_sleep',)
    success_url = reverse_lazy('core:sleep-list')


class TemperatureList(PermissionRequiredMixin, BabyBuddyFilterView):
    model = models.Temperature
    template_name = 'core/temperature_list.html'
    permission_required = ('core.view_temperature',)
    paginate_by = 10
    filterset_fields = ('child',)


class TemperatureAdd(CoreAddView):
    model = models.Temperature
    permission_required = ('core.add_temperature',)
    form_class = forms.TemperatureForm
    success_url = reverse_lazy('core:temperature-list')
    success_message = _('%(model)s reading added!')


class TemperatureUpdate(CoreUpdateView):
    model = models.Temperature
    permission_required = ('core.change_temperature',)
    form_class = forms.TemperatureForm
    success_url = reverse_lazy('core:temperature-list')
    success_message = _('%(model)s reading for %(child)s updated.')


class TemperatureDelete(CoreDeleteView):
    model = models.Temperature
    permission_required = ('core.delete_temperature',)
    success_url = reverse_lazy('core:temperature-list')


class Timeline(LoginRequiredMixin, TemplateView):
    template_name = 'timeline/timeline.html'

    # Show the overall timeline or a child timeline if one Child instance.
    def get(self, request, *args, **kwargs):
        children = models.Child.objects.count()
        if children == 1:
            return HttpResponseRedirect(
                reverse(
                    'core:child',
                    args={models.Child.objects.first().slug}
                )
            )
        return super(Timeline, self).get(request, *args, **kwargs)

    def get_context_data(self, **kwargs):
        context = super(Timeline, self).get_context_data(**kwargs)
        date = self.request.GET.get('date', str(timezone.localdate()))
        _prepare_timeline_context_data(context, date)
        return context


class TimerList(PermissionRequiredMixin, BabyBuddyFilterView):
    model = models.Timer
    template_name = 'core/timer_list.html'
    permission_required = ('core.view_timer',)
    paginate_by = 10
    filterset_fields = ('active', 'user')


class TimerDetail(PermissionRequiredMixin, DetailView):
    model = models.Timer
    permission_required = ('core.view_timer',)


class TimerAdd(PermissionRequiredMixin, CreateView):
    model = models.Timer
    permission_required = ('core.add_timer',)
    form_class = forms.TimerForm

    def get_form_kwargs(self):
        kwargs = super(TimerAdd, self).get_form_kwargs()
        kwargs.update({'user': self.request.user})
        return kwargs

    def get_success_url(self):
        return reverse('core:timer-detail', kwargs={'pk': self.object.pk})


class TimerUpdate(CoreUpdateView):
    model = models.Timer
    permission_required = ('core.change_timer',)
    form_class = forms.TimerForm
    success_url = reverse_lazy('core:timer-list')

    def get_form_kwargs(self):
        kwargs = super(TimerUpdate, self).get_form_kwargs()
        kwargs.update({'user': self.request.user})
        return kwargs

    def get_success_url(self):
        instance = self.get_object()
        return reverse('core:timer-detail', kwargs={'pk': instance.pk})


class TimerAddQuick(PermissionRequiredMixin, RedirectView):
    http_method_names = ['post']
    permission_required = ('core.add_timer',)

    def post(self, request, *args, **kwargs):
        instance = models.Timer.objects.create(user=request.user)
        # Add child relationship if there is only Child instance.
        if models.Child.count() == 1:
            instance.child = models.Child.objects.first()
        instance.save()
        self.url = request.GET.get(
            'next', reverse('core:timer-detail', args={instance.id}))
        return super(TimerAddQuick, self).get(request, *args, **kwargs)


class TimerRestart(PermissionRequiredMixin, RedirectView):
    http_method_names = ['post']
    permission_required = ('core.change_timer',)

    def post(self, request, *args, **kwargs):
        instance = models.Timer.objects.get(id=kwargs['pk'])
        instance.restart()
        messages.success(request, '{} restarted.'.format(instance))
        return super(TimerRestart, self).get(request, *args, **kwargs)

    def get_redirect_url(self, *args, **kwargs):
        return reverse('core:timer-detail', kwargs={'pk': kwargs['pk']})


class TimerStop(PermissionRequiredMixin, SuccessMessageMixin, RedirectView):
    http_method_names = ['post']
    permission_required = ('core.change_timer',)
    success_message = _('%(timer)s stopped.')

    def post(self, request, *args, **kwargs):
        instance = models.Timer.objects.get(id=kwargs['pk'])
        instance.stop()
        messages.success(request, '{} stopped.'.format(instance))
        return super(TimerStop, self).get(request, *args, **kwargs)

    def get_redirect_url(self, *args, **kwargs):
        return reverse('core:timer-detail', kwargs={'pk': kwargs['pk']})


class TimerDelete(CoreDeleteView):
    model = models.Timer
    permission_required = ('core.delete_timer',)
    success_url = reverse_lazy('core:timer-list')


class TimerDeleteInactive(PermissionRequiredMixin, SuccessMessageMixin,
                          FormView):
    permission_required = ('core.delete_timer',)
    form_class = Form
    template_name = 'core/timer_confirm_delete_inactive.html'
    success_url = reverse_lazy('core:timer-list')
    success_message = _('All inactive timers deleted.')

    def get_context_data(self, **kwargs):
        kwargs = super().get_context_data(**kwargs)
        kwargs['timer_count'] = self.get_instances().count()
        return kwargs

    def get(self, request, *args, **kwargs):
        # Redirect back to list if there are no inactive timers.
        if self.get_instances().count() == 0:
            messages.warning(request, _('No inactive timers exist.'))
            return HttpResponseRedirect(self.success_url)
        return super().get(request, *args, **kwargs)

    def form_valid(self, form):
        self.get_instances().delete()
        return super().form_valid(form)

    @staticmethod
    def get_instances():
        return models.Timer.objects.filter(active=False)


class TummyTimeList(PermissionRequiredMixin, BabyBuddyFilterView):
    model = models.TummyTime
    template_name = 'core/tummytime_list.html'
    permission_required = ('core.view_tummytime',)
    paginate_by = 10
    filterset_fields = ('child',)


class TummyTimeAdd(CoreAddView):
    model = models.TummyTime
    permission_required = ('core.add_tummytime',)
    form_class = forms.TummyTimeForm
    success_url = reverse_lazy('core:tummytime-list')


class TummyTimeUpdate(CoreUpdateView):
    model = models.TummyTime
    permission_required = ('core.change_tummytime',)
    form_class = forms.TummyTimeForm
    success_url = reverse_lazy('core:tummytime-list')


class TummyTimeDelete(CoreDeleteView):
    model = models.TummyTime
    permission_required = ('core.delete_tummytime',)
    success_url = reverse_lazy('core:tummytime-list')


class WeightList(PermissionRequiredMixin, BabyBuddyFilterView):
    model = models.Weight
    template_name = 'core/weight_list.html'
    permission_required = ('core.view_weight',)
    paginate_by = 10
    filterset_fields = ('child',)


class WeightAdd(CoreAddView):
    model = models.Weight
    permission_required = ('core.add_weight',)
    form_class = forms.WeightForm
    success_url = reverse_lazy('core:weight-list')


class WeightUpdate(CoreUpdateView):
    model = models.Weight
    permission_required = ('core.change_weight',)
    form_class = forms.WeightForm
    success_url = reverse_lazy('core:weight-list')


class WeightDelete(CoreDeleteView):
    model = models.Weight
    permission_required = ('core.delete_weight',)
    success_url = reverse_lazy('core:weight-list')