import datetime, os

from django.views.generic import ListView, TemplateView, DetailView, View
from django.views.generic.edit import CreateView, UpdateView
from django.conf import settings
from django.views.decorators.http import require_safe
from django.http import Http404, HttpResponse
from django.utils.decorators import method_decorator
from django.contrib.auth.mixins import LoginRequiredMixin
from django.contrib import messages
from django.shortcuts import redirect
from django.urls import reverse

import icalendar

from camps.mixins import CampViewMixin
from .mixins import CreateProposalMixin, EnsureUnapprovedProposalMixin, EnsureUserOwnsProposalMixin, EnsureWritableCampMixin, PictureViewMixin, EnsureCFSOpenMixin
from . import models


############## ical calendar ########################################################


class ICSView(CampViewMixin, View):
    def get(self, request, *args, **kwargs):
        eventinstances = models.EventInstance.objects.filter(event__camp=self.camp)
        type_ = request.GET.get('type', None)
        location = request.GET.get('location', None)

        if type_:
            try:
                eventtype = models.EventType.objects.get(
                    slug=type_
                )
                eventinstances = eventinstances.filter(event__event_type=eventtype)
            except models.EventType.DoesNotExist:
                raise Http404

        if location:
            try:
                eventlocation = models.EventLocation.objects.get(
                    slug=location,
                    camp=self.camp,
                )
                eventinstances = eventinstances.filter(location__slug=location)
            except models.EventLocation.DoesNotExist:
                raise Http404

        cal = icalendar.Calendar()
        for event_instance in eventinstances:
            cal.add_component(event_instance.get_ics_event())

        response = HttpResponse(cal.to_ical())
        response['Content-Type'] = 'text/calendar'
        response['Content-Disposition'] = 'inline; filename={}.ics'.format(self.camp.slug)
        return response


############## proposals ########################################################


class ProposalListView(LoginRequiredMixin, CampViewMixin, ListView):
    model = models.SpeakerProposal
    template_name = 'proposal_list.html'
    context_object_name = 'speakerproposal_list'

    def get_queryset(self, **kwargs):
        # only show speaker proposals for the current user
        return super().get_queryset().filter(user=self.request.user)

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        # also add eventproposals to the context
        context['eventproposal_list'] = models.EventProposal.objects.filter(camp=self.camp, user=self.request.user)
        return context


class SpeakerProposalCreateView(LoginRequiredMixin, CampViewMixin, CreateProposalMixin, EnsureWritableCampMixin, EnsureCFSOpenMixin, CreateView):
    model = models.SpeakerProposal
    fields = ['name', 'biography', 'picture_small', 'picture_large']
    template_name = 'speakerproposal_form.html'

    def get_success_url(self):
        return reverse('proposal_list', kwargs={'camp_slug': self.camp.slug})


class SpeakerProposalUpdateView(LoginRequiredMixin, CampViewMixin, EnsureUserOwnsProposalMixin, EnsureUnapprovedProposalMixin, EnsureWritableCampMixin, EnsureCFSOpenMixin, UpdateView):
    model = models.SpeakerProposal
    fields = ['name', 'biography', 'picture_small', 'picture_large']
    template_name = 'speakerproposal_form.html'

    def get_success_url(self):
        return reverse('proposal_list', kwargs={'camp_slug': self.camp.slug})

    def form_valid(self, form):
        if form.instance.proposal_status == models.UserSubmittedModel.PROPOSAL_PENDING:
            messages.warning(self.request, "Your speaker proposal has been reverted to status draft. Please submit it again when you are ready.")
            form.instance.proposal_status = models.UserSubmittedModel.PROPOSAL_DRAFT
        return super().form_valid(form)


class SpeakerProposalSubmitView(LoginRequiredMixin, CampViewMixin, EnsureUserOwnsProposalMixin, EnsureUnapprovedProposalMixin, EnsureWritableCampMixin, EnsureCFSOpenMixin, UpdateView):
    model = models.SpeakerProposal
    fields = []
    template_name = 'speakerproposal_submit.html'

    def get_success_url(self):
        return reverse('proposal_list', kwargs={'camp_slug': self.camp.slug})

    def form_valid(self, form):
        form.instance.proposal_status = models.UserSubmittedModel.PROPOSAL_PENDING
        messages.info(self.request, "Your proposal has been submitted and is now pending approval")
        return super().form_valid(form)


class SpeakerProposalDetailView(LoginRequiredMixin, CampViewMixin, EnsureUserOwnsProposalMixin, DetailView):
    model = models.SpeakerProposal
    template_name = 'speakerproposal_detail.html'


@method_decorator(require_safe, name='dispatch')
class SpeakerProposalPictureView(LoginRequiredMixin, CampViewMixin, EnsureUserOwnsProposalMixin, PictureViewMixin, DetailView):
    model = models.SpeakerProposal

    def get(self, request, *args, **kwargs):
        # is the proposal owned by current user?
        if self.get_object().user != request.user:
            raise Http404()

        # get and return the response
        response = self.get_picture_response('/public/speakerproposals/%(campslug)s/%(proposaluuid)s/%(filename)s' % {
            'campslug': self.camp.slug,
            'proposaluuid': self.get_object().uuid,
            'filename': os.path.basename(self.picture.name),
        })

        return response


class EventProposalCreateView(LoginRequiredMixin, CampViewMixin, CreateProposalMixin, EnsureWritableCampMixin, EnsureCFSOpenMixin, CreateView):
    model = models.EventProposal
    fields = ['title', 'abstract', 'event_type', 'speakers']
    template_name = 'eventproposal_form.html'

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        context['form'].fields['speakers'].queryset = models.SpeakerProposal.objects.filter(camp=self.camp, user=self.request.user)
        context['form'].fields['event_type'].queryset = models.EventType.objects.filter(public=True)
        return context


class EventProposalUpdateView(LoginRequiredMixin, CampViewMixin, EnsureUserOwnsProposalMixin, EnsureUnapprovedProposalMixin, EnsureWritableCampMixin, EnsureCFSOpenMixin, UpdateView):
    model = models.EventProposal
    fields = ['title', 'abstract', 'event_type', 'speakers']
    template_name = 'eventproposal_form.html'

    def get_success_url(self):
        return reverse('proposal_list', kwargs={'camp_slug': self.camp.slug})

    def form_valid(self, form):
        if form.instance.proposal_status == models.UserSubmittedModel.PROPOSAL_PENDING:
            messages.warning(self.request, "Your event proposal has been reverted to status draft. Please submit it again when you are ready.")
            form.instance.proposal_status = models.UserSubmittedModel.PROPOSAL_DRAFT
        return super().form_valid(form)


class EventProposalSubmitView(LoginRequiredMixin, CampViewMixin, EnsureUserOwnsProposalMixin, EnsureUnapprovedProposalMixin, EnsureWritableCampMixin, EnsureCFSOpenMixin, UpdateView):
    model = models.EventProposal
    fields = []
    template_name = 'eventproposal_submit.html'

    def get_success_url(self):
        return reverse('proposal_list', kwargs={'camp_slug': self.camp.slug})

    def form_valid(self, form):
        form.instance.proposal_status = models.UserSubmittedModel.PROPOSAL_PENDING
        messages.info(self.request, "Your proposal has been submitted and is now pending approval")
        return super().form_valid(form)


class EventProposalDetailView(LoginRequiredMixin, CampViewMixin, EnsureUserOwnsProposalMixin, DetailView):
    model = models.EventProposal
    template_name = 'eventproposal_detail.html'


################## speakers ###############################################


@method_decorator(require_safe, name='dispatch')
class SpeakerPictureView(CampViewMixin, PictureViewMixin, DetailView):
    model = models.Speaker

    def get(self, request, *args, **kwargs):
        # get and return the response
        response = self.get_picture_response(path='/public/speakers/%(campslug)s/%(slug)s/%(filename)s' % {
            'campslug': self.camp.slug,
            'slug': self.get_object().slug,
            'filename': os.path.basename(self.picture.name),
        })
        return response


class SpeakerDetailView(CampViewMixin, DetailView):
    model = models.Speaker
    template_name = 'speaker_detail.html'


class SpeakerListView(CampViewMixin, ListView):
    model = models.Speaker
    template_name = 'speaker_list.html'


################## events ##############################################


class EventListView(CampViewMixin, ListView):
    model = models.Event
    template_name = 'event_list.html'


class EventDetailView(CampViewMixin, DetailView):
    model = models.Event
    template_name = 'schedule_event_detail.html'


################## schedule #############################################


class ScheduleView(CampViewMixin, TemplateView):
    def get_template_names(self):
        if 'day' in self.kwargs:
            return 'schedule_day.html'
        return 'schedule_overview.html'

    def get_context_data(self, *args, **kwargs):
        context = super(ScheduleView, self).get_context_data(**kwargs)
        eventinstances = models.EventInstance.objects.filter(event__in=self.camp.events.all()).select_related()
        type_slug = self.request.GET.get('type', None)
        location_slug = self.request.GET.get('location', None)

        if type_slug:
            try:
                eventtype = models.EventType.objects.get(
                    slug=type_slug
                )
            except models.EventType.DoesNotExist:
                raise Http404

            context['eventtype'] = eventtype
            context['get_string'] = '?type={}'.format(type_slug)
            eventinstances = eventinstances.filter(event__event_type=eventtype)

        if location_slug:
            try:
                eventlocation = models.EventLocation.objects.get(
                    slug=location_slug,
                    camp=self.camp,
                )
            except models.EventLocation.DoesNotExist:
                raise Http404

            context['location'] = eventlocation
            get_part = 'location={}'.format(location_slug)
            if 'get_string' in context:
                context['get_string'] = context['get_string'] + '&{}'.format(get_part)
            else:
                context['get_string'] = '?{}'.format(get_part)

            eventinstances = eventinstances.filter(location=eventlocation)

        context['eventinstances'] = eventinstances

        # Do stuff if we are dealing with a day schedule
        if 'day' in kwargs:
            when = datetime.datetime(year=int(self.kwargs['year']), month=int(self.kwargs['month']), day=int(self.kwargs['day']))
            eventinstances = models.EventInstance.objects.filter(event__in=self.camp.events.all())
            skip = []
            for ei in eventinstances:
                if ei.schedule_date != when.date():
                    skip.append(ei.id)
                else:
                    if 'type' in self.request.GET:
                        eventtype = models.EventType.objects.get(
                            slug=self.request.GET['type']
                        )
                        if ei.event.event_type != eventtype:
                            skip.append(ei.id)
            eventinstances = eventinstances.exclude(id__in=skip).order_by('event__event_type')
            if 'location' in self.request.GET:
                eventlocation = models.EventLocation.objects.get(
                    camp=self.camp,
                    slug=self.request.GET['location']
                )
                eventinstances = eventinstances.filter(location=eventlocation)

            context['eventinstances'] = eventinstances

            start = when + datetime.timedelta(hours=settings.SCHEDULE_MIDNIGHT_OFFSET_HOURS)
            timeslots = []
            # calculate how many timeslots we have in the schedule based on the lenght of the timeslots in minutes,
            # and the number of minutes in 24 hours
            for i in range(0,int((24*60)/settings.SCHEDULE_TIMESLOT_LENGTH_MINUTES)):
                timeslot = start + datetime.timedelta(minutes=i*settings.SCHEDULE_TIMESLOT_LENGTH_MINUTES)
                timeslots.append(timeslot)
            context['timeslots'] = timeslots

            # include the components to make the urls
            context['urlyear'] = self.kwargs['year']
            context['urlmonth'] = self.kwargs['month']
            context['urlday'] = self.kwargs['day']

        return context


class CallForSpeakersView(CampViewMixin, TemplateView):
    def get_template_names(self):
        return '%s_call_for_speakers.html' % self.camp.slug