import datetime

import pytz
from django.conf import settings
from django.db.models import Q
from django_ical.views import ICalFeed

from RIGS import models


class CalendarICS(ICalFeed):
    """
    A simple event calender
    """

    # Metadata which is passed on to clients
    product_id = "RIGS"
    title = "RIGS Calendar"
    timezone = settings.TIME_ZONE
    file_name = "rigs.ics"

    # Cancelled = 'cancelled' = False
    # Dry Hire = 'dry-hire' = True
    # Non Rig = 'non-rig' = True
    # Rig = 'rig' = True
    # Provisional = 'provisional' = True
    # Confirmed/Booked = 'confirmed' = True
    # Only MIC = 'mic' = False

    def get_object(self, request, *args, **kwargs):
        params = {}

        params["dry-hire"] = request.GET.get("dry-hire", "true") == "true"
        params["non-rig"] = request.GET.get("non-rig", "true") == "true"
        params["rig"] = request.GET.get("rig", "true") == "true"

        params["cancelled"] = request.GET.get("cancelled", "false") == "true"
        params["provisional"] = request.GET.get("provisional", "true") == "true"
        params["confirmed"] = request.GET.get("confirmed", "true") == "true"
        params["only_mic"] = request.GET.get("only_mic", "false") == "true"

        params["user"] = kwargs["user"]

        return params

    def description(self, params):
        desc = (
            "Calendar generated by RIGS system. This includes event types: "
            + ("Rig, " if params["rig"] else "")
            + ("Non-rig, " if params["non-rig"] else "")
            + ("Dry Hire " if params["dry-hire"] else "")
            + "\n"
        )
        desc = (
            desc
            + "Includes events with status: "
            + ("Cancelled, " if params["cancelled"] else "")
            + ("Provisional, " if params["provisional"] else "")
            + ("Confirmed/Booked, " if params["confirmed"] else "")
        )

        return desc

    def items(self, params):
        # include events from up to 1 year ago
        start = datetime.datetime.now() - datetime.timedelta(days=365)
        filter = Q(start_date__gte=start)

        typeFilters = Q(pk=None)  # Need something that is false for every entry

        if params["dry-hire"]:
            typeFilters = typeFilters | Q(dry_hire=True, is_rig=True)

        if params["non-rig"]:
            typeFilters = typeFilters | Q(is_rig=False)

        if params["rig"]:
            typeFilters = typeFilters | Q(is_rig=True, dry_hire=False)

        statusFilters = Q(pk=None)  # Need something that is false for every entry

        if params["cancelled"]:
            statusFilters = statusFilters | Q(status=models.Event.CANCELLED)
        if params["provisional"]:
            statusFilters = statusFilters | Q(status=models.Event.PROVISIONAL)
        if params["confirmed"]:
            statusFilters = statusFilters | Q(status=models.Event.CONFIRMED) | Q(status=models.Event.BOOKED)

        filter = filter & typeFilters & statusFilters

        if params["only_mic"]:
            filter = filter & Q(mic=params["user"])

        return (
            models.Event.objects.filter(filter)
            .order_by("-start_date")
            .select_related("person", "organisation", "venue", "mic")
        )

    def item_title(self, item):
        title = ""

        # Prefix title with status (if it's a critical status)
        if item.cancelled:
            title += "CANCELLED: "

        if not item.is_rig:
            title += "NON-RIG: "

        if item.dry_hire:
            title += "DRY HIRE: "

        # Add the rig name
        title += item.name

        # Add the status
        title += f" ({item.get_status_display()})"

        return title

    def item_start_datetime(self, item):
        return item.earliest_time

    def item_end_datetime(self, item):
        # if isinstance(item.latest_time, datetime.date):  # Ical end_datetime is non-inclusive, so add a day
        #    return item.latest_time + datetime.timedelta(days=1)
        return item.latest_time

    def item_location(self, item):
        return item.venue

    def item_description(self, item):
        # Create a nice information-rich description
        # note: only making use of information available to "non-keyholders"

        tz = pytz.timezone(self.timezone)

        desc = f"Rig ID = {item.display_id}\n"
        desc += f"Event = {item.name}\n"
        desc += "Venue = " + (item.venue.name if item.venue else "---") + "\n"
        if item.is_rig and item.person:
            desc += (
                "Client = "
                + item.person.name
                + ((" for " + item.organisation.name) if item.organisation else "")
                + "\n"
            )
        desc += f"Status = {item.get_status_display()}\n"
        desc += "MIC = " + (item.mic.name if item.mic else "---") + "\n"

        desc += "\n"
        if item.meet_at:
            desc += (
                "Crew Meet = "
                + (item.meet_at.astimezone(tz).strftime("%Y-%m-%d %H:%M") if item.meet_at else "---")
                + "\n"
            )
        if item.access_at:
            desc += (
                "Access At = "
                + (item.access_at.astimezone(tz).strftime("%Y-%m-%d %H:%M") if item.access_at else "---")
                + "\n"
            )
        if item.start_date:
            desc += (
                "Event Start = "
                + item.start_date.strftime("%Y-%m-%d")
                + ((" " + item.start_time.strftime("%H:%M")) if item.has_start_time else "")
                + "\n"
            )
        if item.end_date:
            desc += (
                "Event End = "
                + item.end_date.strftime("%Y-%m-%d")
                + ((" " + item.end_time.strftime("%H:%M")) if item.has_end_time else "")
                + "\n"
            )

        desc += "\n"
        if item.description:
            desc += f"Event Description:\n{item.description}\n\n"
        # if item.notes:  // Need to add proper keyholder checks before this gets put back
        #     desc += 'Notes:\n'+item.notes+'\n\n'

        desc += f"URL = https://rigs.nottinghamtec.co.uk{item.get_absolute_url()}"

        return desc

    def item_link(self, item):
        # Make a link to the event in the web interface
        return item.get_absolute_url()

    def item_updated(self, item):  # some ical clients will display this
        return item.last_edited_at

    def item_guid(self, item):  # use the rig-id as the ical unique event identifier
        return item.pk