from datetime import datetime

from django.conf import settings
from django.contrib import messages
from django.contrib.auth.decorators import login_required
from django.http import HttpResponse
from django.shortcuts import render

from dal import autocomplete

from .models import Member
from membershipworks import MembershipWorks


class MemberAutocomplete(autocomplete.Select2QuerySetView):
    model = Member
    search_fields = ["account_name"]

    def get_queryset(self):
        if not self.request.user.has_perm("membershipworks.view_member"):
            return Member.objects.none()
        else:
            return super().get_queryset()


@login_required
# TODO: permission required?
def upcoming_events(request):
    now = datetime.now()

    membershipworks = MembershipWorks()
    membershipworks.login(
        settings.MEMBERSHIPWORKS_USERNAME, settings.MEMBERSHIPWORKS_PASSWORD
    )

    events = membershipworks.get_events_list(now)
    if "error" in events:
        messages.add_message(
            request,
            messages.ERROR,
            f"MembershipWorks Error: {events['error']}",
        )
        # TODO: this should probably be an HTTP 500 response
        return render(request, "base.dj.html")

    ongoing_events = []
    full_events = []
    upcoming_events = []
    for event in events["evt"]:
        try:
            # ignore hidden events
            if event["cal"] == 0:
                continue
            event_details = membershipworks.get_event_by_eid(event["eid"])

            # Convert timestamps to datetime objects
            event_details["sdp_dt"] = datetime.fromtimestamp(event_details["sdp"])
            event_details["edp_dt"] = datetime.fromtimestamp(event_details["edp"])

            # registration has already ended
            if (
                "erd" in event_details
                and datetime.fromtimestamp(event_details["erd"]) < now
            ):
                ongoing_events.append(event_details)
            # class is full
            elif event_details["cnt"] >= event_details["cap"]:
                full_events.append(event_details)
            else:
                upcoming_events.append(event_details)

        except KeyError as e:
            messages.add_message(
                request,
                messages.ERROR,
                f"Event '{event.get('ttl')}' missing required property: '{e.args[0]}'",
            )
            # TODO: this should probably be an HTTP 500 response
            return render(request, "base.dj.html")

    context = {
        "event_sections": [
            {
                "title": "Upcoming Events",
                "blurb": "Events that are currently open for registration.",
                "events": upcoming_events,
                "truncate": False,
            },
            {
                "title": "Just Missed",
                "blurb": "These classes are currently full at time of writing. If you are interested, please check the event's page; spots occasionally open up. Keep an eye on this newsletter to see when these classes are offered again.",
                "events": full_events,
                "truncate": True,
            },
            {
                "title": "Ongoing Events",
                "blurb": "These events are ongoing. Registration is currently closed, but these events may be offered again in the future.",
                "events": ongoing_events,
                "truncate": True,
            },
        ]
    }
    return render(request, "membershipworks/upcoming_events.dj.html", context)