from datetime import datetime
from typing import Self

from django.conf import settings
from django.db import models
from django.db.models import OuterRef, Q, Subquery
from django.utils import timezone
from django.utils.functional import cached_property

from membershipworks.models import Flag as MembershipWorksFlag
from membershipworks.models import Member

from .hid.Credential import Credential, InvalidHexCode
from .hid.DoorController import DoorController


class Door(models.Model):
    name = models.CharField(max_length=64, unique=True)
    ip = models.GenericIPAddressField(protocol="IPv4")
    access_field = models.TextField(
        max_length=128,
        help_text="Membershipworks field that grants members access to this door",
    )

    def __str__(self):
        return self.name

    @property
    def controller(self) -> DoorController:
        return DoorController(
            self.ip,
            settings.HID_DOOR_USERNAME,
            settings.HID_DOOR_PASSWORD,
        )

    @cached_property
    def card_formats(self):
        return self.controller.get_cardFormats()

    @cached_property
    def schedules_map(self):
        return self.controller.get_scheduleMap()


class DoorCardholderMember(models.Model):
    door = models.ForeignKey(Door, on_delete=models.CASCADE)
    cardholder_id = models.IntegerField()
    member = models.ForeignKey(Member, on_delete=models.CASCADE, db_constraint=False)

    class Meta:
        constraints = (
            models.UniqueConstraint(
                fields=("door", "cardholder_id"), name="unique_door_cardholder_id"
            ),
            models.UniqueConstraint(
                fields=("door", "member"), name="unique_door_member"
            ),
        )

    def __str__(self):
        return f"{self.door} [{self.cardholder_id}]: {self.member}"


class Schedule(models.Model):
    name = models.CharField(max_length=255, unique=True)

    def __str__(self) -> str:
        return f"{self.name}"


class AbstractScheduleRule(models.Model):
    schedule = models.ForeignKey(Schedule, on_delete=models.CASCADE)
    doors = models.ManyToManyField(Door)

    class Meta:
        abstract = True


class FlagScheduleRule(AbstractScheduleRule):
    flag = models.ForeignKey(
        MembershipWorksFlag,
        null=True,
        blank=True,
        on_delete=models.PROTECT,
        db_constraint=False,
    )

    def __str__(self) -> str:
        return f"{self.schedule} [flag: {self.flag}]"


class AttributeScheduleRule(AbstractScheduleRule):
    access_field = models.CharField(
        max_length=128,
        help_text=(
            "Membershipworks field that grants members access to this door using this schedule."
        ),
    )

    def __str__(self) -> str:
        return f"{self.schedule} [attribute: {self.access_field}]"


class HIDEventQuerySet(models.QuerySet):
    def with_member_id(self):
        return self.annotate(
            member_id=Subquery(
                DoorCardholderMember.objects.filter(
                    door=OuterRef("door"), cardholder_id=OuterRef("cardholder_id")
                ).values("member_id"),
            )
        )


class HIDEvent(models.Model):
    class EventType(models.IntegerChoices):
        DENIED_ACCESS_CARD_NOT_FOUND = 1022, "Denied Access: Card Not Found"
        DENIED_ACCESS_ACCESS_PIN_NOT_FOUND = 1023, "Denied Access Access: PIN Not Found"
        GRANTED_ACCESS = 2020, "Granted Access"
        GRANTED_ACCESS_EXTENDED_TIME = 2021, "Granted Access: Extended Time"
        DENIED_ACCESS_SCHEDULE = 2024, "Denied Access: Schedule"
        DENIED_ACCESS_WRONG_PIN = 2029, "Denied Access: Wrong PIN"
        DENIED_ACCESS_CARD_EXPIRED = 2036, "Denied Access: Card Expired"
        DENIED_ACCESS_PIN_LOCKOUT = 2042, "Denied Access: PIN Lockout"
        DENIED_ACCESS_UNASSIGNED_CARD = 2043, "Denied Access: Unassigned Card"
        DENIED_ACCESS_UNASSIGNED_ACCESS_PIN = (
            2044,
            "Denied Access: Unassigned Access PIN",
        )
        DENIED_ACCESS_PIN_EXPIRED = 2046, "Denied Access: PIN Expired"
        ALARM_ACKNOWLEDGED = 4034, "Alarm Acknowledged"
        DOOR_LOCKED_SCHEDULED = 4035, "Door Locked: Scheduled"
        DOOR_UNLOCKED_SCHEDULED = 4036, "Door Unlocked: Scheduled"
        DOOR_FORCED_ALARM = 4041, "Door Forced Alarm"
        DOOR_HELD_ALARM = 4042, "Door Held Alarm"
        TAMPER_SWITCH_ALARM = 4043, "Tamper Switch Alarm"
        AC_FAILURE = 4044, "AC Failure"
        BATTERY_FAILURE = 4045, "Battery Failure"
        REX_SWITCH_ALARM = 4051, "REX Switch Alarm"
        TIME_SET_TO = 7020, "Time Set To"
        GRANTED_ACCESS_MANUAL = 12031, "Granted Access: Manual"
        DOOR_UNLOCKED = 12032, "Door Unlocked"
        DOOR_LOCKED = 12033, "Door Locked"

        @classmethod
        def any_granted_access(cls) -> list[Self]:
            return [t for t in cls if t.name.startswith("GRANTED_ACCESS")]

    door = models.ForeignKey(Door, on_delete=models.CASCADE)
    timestamp = models.DateTimeField()
    event_type = models.IntegerField(db_column="eventType", choices=EventType.choices)
    reader_address = models.IntegerField(db_column="readerAddress")
    cardholder_id = models.IntegerField(blank=True, null=True, db_column="cardholderID")
    command_status = models.BooleanField(
        blank=True, null=True, db_column="commandStatus"
    )
    forename = models.TextField(blank=True, null=True)
    surname = models.TextField(blank=True, null=True)
    io_state = models.BooleanField(blank=True, null=True, db_column="ioState")
    new_time = models.DateTimeField(blank=True, null=True, db_column="newTime")
    old_time = models.DateTimeField(blank=True, null=True, db_column="oldTime")
    raw_card_number = models.TextField(blank=True, null=True, db_column="rawCardNumber")

    # Based on `function isRedEvent` from /html/hid-global.js on a HID EDGE EVO Solo
    is_red = models.GeneratedField(
        expression=Q(
            event_type__in=[
                EventType.DENIED_ACCESS_CARD_NOT_FOUND,
                EventType.DENIED_ACCESS_ACCESS_PIN_NOT_FOUND,
                EventType.DENIED_ACCESS_SCHEDULE,
                EventType.DENIED_ACCESS_WRONG_PIN,
                EventType.DENIED_ACCESS_CARD_EXPIRED,
                EventType.DENIED_ACCESS_PIN_LOCKOUT,
                EventType.DENIED_ACCESS_UNASSIGNED_CARD,
                EventType.DENIED_ACCESS_PIN_EXPIRED,
                EventType.DOOR_FORCED_ALARM,
                EventType.DOOR_HELD_ALARM,
                EventType.TAMPER_SWITCH_ALARM,
                EventType.AC_FAILURE,
                EventType.BATTERY_FAILURE,
            ]
        ),
        output_field=models.BooleanField(),
        db_persist=True,
    )

    objects = HIDEventQuerySet.as_manager()

    class Meta:
        constraints = [
            models.UniqueConstraint(
                fields=["door", "timestamp", "event_type"], name="unique_hidevent"
            )
        ]
        db_table = "hidevent"
        ordering = ("-timestamp",)

    def __str__(self):
        return f"{self.door.name} {self.timestamp} - {self.description}"

    @classmethod
    def from_xml_attributes(cls, door: Door, attrib: dict[str, str]):
        field_lookup = {
            field.column: field.attname for field in HIDEvent._meta.get_fields()
        }

        def attr_to_bool(attr):
            if attr is None:
                return None
            else:
                return attr == "true"

        return cls(
            **{
                **{field_lookup[k]: v for k, v in attrib.items()},
                "door": door,
                # fixups for specific attributes
                "timestamp": timezone.make_aware(
                    datetime.fromisoformat(attrib["timestamp"])
                ),
                "io_state": attr_to_bool(attrib.get("ioState")),
                "command_status": attr_to_bool(attrib.get("commandStatus")),
            }
        )

    @property
    def description(self):
        """
        Based on `Global.localeStrings` from /html/en_EN/en_EN.js
        and `function eventDataHandler` from /html/modules/hid-dashboard.js
        on a HID EDGE EVO Solo
        """

        name = f"{self.forename} {self.surname}"
        direction = "IN" if self.reader_address == 0 else "OUT"

        event_types = {
            1022: f"Denied Access, {direction} Card Not Found {self.raw_card_number}",
            1023: f"Denied Access, {direction} Access PIN Not Found {self.raw_card_number}",
            2020: f"Granted Access, {direction} {name}",
            2021: f"Granted Access, {direction} Extended Time {name}",
            2024: f"Denied Access, {direction} Schedule {name}",
            2029: f"Denied Access, {direction} Wrong PIN {name}",
            2036: f"Denied Access, {direction} Card Expired {name}",
            2042: f"Denied Access, {direction} PIN Lockout {name}",
            2043: f"Denied Access, {direction} Unassigned Card {self.raw_card_number}",
            2044: f"Denied Access, {direction} Unassigned Access PIN {self.raw_card_number}",
            2046: f"Denied Access - PIN Expired {name}",
            4034: "Alarm Acknowledged",
            4035: "Door Locked-Scheduled",
            4036: "Door Unlocked-Scheduled",
            4041: "Door Forced Alarm",
            4042: "Door Held Alarm",
            4043: "Tamper Switch Alarm",
            4044: "AC Failure",
            4045: "Battery Failure",
            4051: "REX Switch Alarm",
            7020: f"Time Set to: {self.new_time}",
            12031: f"Granted Access, {direction} Manual",
            12032: "Door Unlocked",
            12033: "Door Locked",
        }

        return event_types.get(self.event_type, f"Unknown Event Type {self.event_type}")

    def decoded_card_number(self) -> str | None:
        if self.raw_card_number is None:
            return None
        try:
            cred = Credential.from_26bit_hex(self.raw_card_number)
            return f"{cred.facility_code} - {cred.card_number}"
        except InvalidHexCode as e:
            return f"Invalid: {e}"