from datetime import datetime, timedelta

from django.conf import settings
from django.contrib import messages
from django.contrib.auth.decorators import permission_required
from django.contrib.auth.mixins import PermissionRequiredMixin
from django.db.models.functions import TruncMonth, TruncYear
from django.shortcuts import render
from django.template.defaultfilters import floatformat
from django.views.generic.dates import (
    ArchiveIndexView,
    MonthArchiveView,
    YearArchiveView,
)

import django_tables2 as tables
from dal import autocomplete
from django_tables2 import A, SingleTableMixin
from django_tables2.export.views import ExportMixin

from membershipworks.membershipworks_api import MembershipWorks

from .models import EventExt, Member


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()


@permission_required("membershipworks.view_eventext")
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)


class DurationColumn(tables.Column):
    def render(self, value: timedelta):
        if value is None:
            return None
        return floatformat(value.total_seconds() / 60 / 60, -2)

    def value(self, value: timedelta):
        if value is None:
            return None
        return value.total_seconds() / 60 / 60


class EventTable(tables.Table):
    title = tables.Column(
        linkify=lambda record: f"https://membershipworks.com/admin/#!event/admin/{record.url}"
    )
    occurred = tables.BooleanColumn(visible=False)
    start = tables.DateColumn("N d, Y")
    duration = DurationColumn()
    person_hours = DurationColumn()
    meetings = tables.Column()

    class Meta:
        model = EventExt
        fields = (
            "title",
            "occurred",
            "start",
            "instructor",
            "category",
            "count",
            "cap",
            "meetings",
            "duration",
            "person_hours",
        )
        row_attrs = {
            "class": lambda record: (
                "" if record.occurred else "text-decoration-line-through table-danger"
            )
        }


class EventSummaryTable(tables.Table):
    event_count = tables.Column("Events")
    canceled_event_count = tables.Column("Canceled Events")
    count__sum = tables.Column("Tickets")
    instructor__count = tables.Column("Unique Instructors")
    meetings__sum = tables.Column("Meetings")
    duration__sum = DurationColumn("Class Hours")
    person_hours__sum = DurationColumn("Person Hours")


class EventIndexReport(
    ExportMixin, SingleTableMixin, PermissionRequiredMixin, ArchiveIndexView
):
    permission_required = "membershipworks.view_eventext"
    queryset = EventExt.objects.all()
    date_field = "start"
    template_name = "membershipworks/event_index_report.dj.html"
    make_object_list = True
    table_class = EventSummaryTable
    export_formats = ("csv", "xlsx", "ods")
    export_name = "mw_events_index"

    def get_table_kwargs(self):
        year_column = tables.DateColumn(
            "Y",
            linkify=(
                "membershipworks:event-year-report",
                [A("year__year")],
            ),
        )
        return {
            "sequence": ("year", "..."),
            "extra_columns": (("year", year_column),),
        }

    def get_dated_queryset(self, **lookup):
        return (
            super()
            .get_dated_queryset(**lookup)
            .values(year=TruncYear("start"))
            .summarize()
            .order_by("year")
        )


class EventYearReport(
    ExportMixin, SingleTableMixin, PermissionRequiredMixin, YearArchiveView
):
    permission_required = "membershipworks.view_eventext"
    queryset = EventExt.objects.all()
    date_field = "start"
    template_name = "membershipworks/event_year_report.dj.html"
    make_object_list = True
    table_class = EventSummaryTable
    export_formats = ("csv", "xlsx", "ods")

    def get_export_filename(self, export_format):
        return f"mw_events_{self.get_year()}.{export_format}"

    def get_table_kwargs(self):
        month_column = tables.DateColumn(
            "F Y",
            linkify=(
                "membershipworks:event-month-report",
                [A("month__year"), A("month__month")],
            ),
        )
        return {
            "sequence": ("month", "..."),
            "extra_columns": (("month", month_column),),
        }

    def get_dated_queryset(self, **lookup):
        return (
            super()
            .get_dated_queryset(**lookup)
            .values(month=TruncMonth("start"))
            .summarize()
            .order_by("month")
        )


class EventMonthReport(
    ExportMixin, SingleTableMixin, PermissionRequiredMixin, MonthArchiveView
):
    permission_required = "membershipworks.view_eventext"
    queryset = EventExt.objects.select_related("category", "instructor").all()
    date_field = "start"
    template_name = "membershipworks/event_month_report.dj.html"
    table_class = EventTable
    export_formats = ("csv", "xlsx", "ods")

    def get_export_filename(self, export_format):
        return f"mw_events_{self.get_year()}-{self.get_month():02}.{export_format}"