from datetime import datetime
from typing import Optional

import django.core.mail.message
from django.conf import settings
from django.db import models
from django.db.models import (
    Count,
    Exists,
    ExpressionWrapper,
    F,
    OuterRef,
    Q,
    Subquery,
    Sum,
)
from django.utils import timezone


class BaseModel(models.Model):
    _api_names_override = {}
    _date_fields = {}
    _allowed_missing_fields = []

    class Meta:
        abstract = True

    @classmethod
    def _remap_headers(cls, data):
        for field in cls._meta.get_fields():
            # TODO: more robust filtering of fields that don't have a column
            if (
                field.auto_created
                or field.many_to_many
                or not field.concrete
                or field.generated
            ):
                continue

            field_name, api_name = field.get_attname_column()

            if field_name in cls._api_names_override:
                api_name = cls._api_names_override[field_name]

            yield field_name, data[api_name]

    @classmethod
    def from_api_dict(cls, data):
        data = data.copy()

        for field in cls._allowed_missing_fields:
            if field not in data:
                data[field] = None

        # parse date fields to datetime objects
        for field, fmt in cls._date_fields.items():
            if data[field]:
                if fmt is None:
                    # can't use '%s' format string, have to use the special function
                    data[field] = datetime.fromtimestamp(
                        data[field], tz=timezone.get_current_timezone()
                    )
                else:
                    data[field] = datetime.strptime(str(data[field]), fmt)
            else:
                # convert empty string to None to make NULL in SQL
                data[field] = None

        return cls(**dict(cls._remap_headers(data)))


class Flag(BaseModel):
    id = models.CharField(max_length=24, primary_key=True)
    name = models.TextField(null=True, blank=True)
    type = models.CharField(max_length=6)

    def __str__(self):
        return f"{self.name} ({self.type})"

    class Meta:
        db_table = "flag"
        ordering = ("name",)


class MemberQuerySet(models.QuerySet):
    # TODO: maybe rename to reflect EXISTS?
    @staticmethod
    def has_flag(flag_type: str, flag_name: str):
        return Exists(
            Flag.objects.filter(type=flag_type, name=flag_name, members=OuterRef("pk"))
        )

    # TODO: it should be fairly easy to reduce the number of EXISTS by
    # merging the ORed flags
    def with_is_active(self):
        return self.annotate(
            is_active=(
                self.has_flag("folder", "Members")
                | self.has_flag("folder", "CMS Staff")
            )
            & ~(
                self.has_flag("label", "Account On Hold")
                | self.has_flag("level", "CMS Membership on hold")
                | self.has_flag("folder", "Former Members")
            )
        )


# TODO: is this still a temporal table?
class Member(BaseModel):
    objects = MemberQuerySet.as_manager()

    uid = models.CharField(max_length=24, primary_key=True)
    year_of_birth = models.TextField(db_column="Year of Birth", null=True, blank=True)
    account_name = models.TextField(db_column="Account Name", null=True, blank=True)
    first_name = models.TextField(db_column="First Name", null=True, blank=True)
    last_name = models.TextField(db_column="Last Name", null=True, blank=True)
    phone = models.TextField(db_column="Phone", null=True, blank=True)
    email = models.TextField(db_column="Email", null=True, blank=True)
    volunteer_email = models.TextField(
        db_column="Volunteer Email", null=True, blank=True
    )
    address_street = models.TextField(
        db_column="Address (Street)", null=True, blank=True
    )
    address_city = models.TextField(db_column="Address (City)", null=True, blank=True)
    address_state_province = models.TextField(
        db_column="Address (State/Province)", null=True, blank=True
    )
    address_postal_code = models.TextField(
        db_column="Address (Postal Code)", null=True, blank=True
    )
    address_country = models.TextField(
        db_column="Address (Country)", null=True, blank=True
    )
    profile_description = models.TextField(
        db_column="Profile description", null=True, blank=True
    )
    website = models.TextField(db_column="Website", null=True, blank=True)
    fax = models.TextField(db_column="Fax", null=True, blank=True)
    contact_person = models.TextField(db_column="Contact Person", null=True, blank=True)
    password = models.TextField(db_column="Password", null=True, blank=True)
    position_relation = models.TextField(
        db_column="Position/relation", null=True, blank=True
    )
    parent_account_id = models.TextField(
        db_column="Parent Account ID", null=True, blank=True
    )
    closet_storage = models.TextField(
        db_column="Closet Storage #", null=True, blank=True
    )
    storage_shelf = models.TextField(db_column="Storage Shelf #", null=True, blank=True)
    personal_studio_space = models.TextField(
        db_column="Personal Studio Space #", null=True, blank=True
    )
    access_permitted_shops_during_extended_hours = models.BooleanField(
        db_column="Access Permitted Shops During Extended Hours?"
    )
    access_front_door_and_studio_space_during_extended_hours = models.BooleanField(
        db_column="Access Front Door and Studio Space During Extended Hours?"
    )
    access_wood_shop = models.BooleanField(db_column="Access Wood Shop?")
    access_metal_shop = models.BooleanField(db_column="Access Metal Shop?")
    access_storage_closet = models.BooleanField(db_column="Access Storage Closet?")
    access_studio_space = models.BooleanField(db_column="Access Studio Space?")
    access_front_door = models.BooleanField(db_column="Access Front Door?")
    access_card_number = models.TextField(
        db_column="Access Card Number", null=True, blank=True
    )
    access_card_facility_code = models.TextField(
        db_column="Access Card Facility Code", null=True, blank=True
    )
    auto_billing_id = models.TextField(
        db_column="Auto Billing ID", null=True, blank=True
    )
    billing_method = models.TextField(db_column="Billing Method", null=True, blank=True)
    renewal_date = models.DateField(db_column="Renewal Date", null=True, blank=True)
    join_date = models.DateField(db_column="Join Date", null=True, blank=True)
    admin_note = models.TextField(db_column="Admin note", null=True, blank=True)
    profile_gallery_image_url = models.TextField(
        db_column="Profile gallery image URL", null=True, blank=True
    )
    business_card_image_url = models.TextField(
        db_column="Business card image URL", null=True, blank=True
    )
    instagram = models.TextField(db_column="Instagram", null=True, blank=True)
    pinterest = models.TextField(db_column="Pinterest", null=True, blank=True)
    youtube = models.TextField(db_column="Youtube", null=True, blank=True)
    yelp = models.TextField(db_column="Yelp", null=True, blank=True)
    google = models.TextField(db_column="Google+", null=True, blank=True)
    bbb = models.TextField(db_column="BBB", null=True, blank=True)
    twitter = models.TextField(db_column="Twitter", null=True, blank=True)
    facebook = models.TextField(db_column="Facebook", null=True, blank=True)
    linked_in = models.TextField(db_column="LinkedIn", null=True, blank=True)
    do_not_show_street_address_in_profile = models.TextField(
        db_column="Do not show street address in profile", null=True, blank=True
    )
    do_not_list_in_directory = models.TextField(
        db_column="Do not list in directory", null=True, blank=True
    )
    how_did_you_hear = models.TextField(
        db_column="HowDidYouHear", null=True, blank=True
    )
    authorize_charge = models.TextField(
        db_column="authorizeCharge", null=True, blank=True
    )
    policy_agreement = models.TextField(
        db_column="policyAgreement", null=True, blank=True
    )
    waiver_form_signed_and_on_file_date = models.DateField(
        db_column="Waiver form signed and on file date.", null=True, blank=True
    )
    membership_agreement_signed_and_on_file_date = models.DateField(
        db_column="Membership Agreement signed and on file date.", null=True, blank=True
    )
    ip_address = models.TextField(db_column="IP Address", null=True, blank=True)
    audit_date = models.DateField(db_column="Audit Date", null=True, blank=True)
    agreement_version = models.TextField(
        db_column="Agreement Version", null=True, blank=True
    )
    paperwork_status = models.TextField(
        db_column="Paperwork status", null=True, blank=True
    )
    membership_agreement_dated = models.BooleanField(
        db_column="Membership agreement dated"
    )
    membership_agreement_acknowledgement_page_filled_out = models.BooleanField(
        db_column="Membership Agreement Acknowledgement Page Filled Out"
    )
    membership_agreement_signed = models.BooleanField(
        db_column="Membership Agreement Signed"
    )
    liability_form_filled_out = models.BooleanField(
        db_column="Liability Form Filled Out"
    )
    flags = models.ManyToManyField(Flag, through="MemberFlag", related_name="members")

    _api_names_override = {
        "uid": "Account ID",
        "how_did_you_hear": "Please tell us how you heard about the Claremont MakerSpace and what tools or shops you are most excited to start using:",
        "authorize_charge": "Yes - I authorize TwinState MakerSpaces, Inc. to charge my credit card for the membership and other options that I have selected.",
        "policy_agreement": "I have read the Claremont MakerSpace Membership Agreement & Policies, and agree to all terms stated therein.",
    }

    _date_fields = {
        "Join Date": "%b %d, %Y",
        "Renewal Date": "%b %d, %Y",
        "Audit Date": "%m/%d/%Y",
        "Membership Agreement signed and on file date.": "%m/%d/%Y",
        "Waiver form signed and on file date.": "%m/%d/%Y",
    }

    def __str__(self):
        return f"{self.account_name}"

    class Meta:
        db_table = "members"
        ordering = ("first_name", "last_name")
        indexes = [
            models.Index(fields=["account_name"], name="account_name_idx"),
            models.Index(fields=["first_name"], name="first_name_idx"),
            models.Index(fields=["last_name"], name="last_name_idx"),
        ]

    @classmethod
    def from_user(cls, user) -> Optional["Member"]:
        if hasattr(user, "ldap_user"):
            return cls.objects.get(uid=user.ldap_user.attrs["employeeNumber"][0])

    def sanitized_mailbox(self, name_ext: str = "", use_volunteer=False) -> str:
        if use_volunteer and self.volunteer_email:
            email = self.volunteer_email
        elif self.email:
            email = self.email
        else:
            raise Exception(f"No Email Address for user: {self.uid}")

        if not self.account_name:
            return email

        return django.core.mail.message.sanitize_address(
            (self.account_name + name_ext, email), settings.DEFAULT_CHARSET
        )


class MemberFlag(BaseModel):
    member = models.ForeignKey(
        Member, on_delete=models.PROTECT, db_column="uid", db_constraint=False
    )
    flag = models.ForeignKey(Flag, on_delete=models.PROTECT)

    def __str__(self):
        return f"{self.member} - {self.flag}"

    class Meta:
        db_table = "memberflag"
        constraints = [
            models.UniqueConstraint(
                fields=["member", "flag"], name="unique_member_flag"
            )
        ]


class Transaction(BaseModel):
    sid = models.CharField(max_length=256, null=True, blank=True)
    member = models.ForeignKey(
        Member,
        on_delete=models.PROTECT,
        db_column="uid",
        db_constraint=False,
        related_name="transactions",
        null=True,
        blank=True,
    )
    timestamp = models.DateTimeField()
    type = models.TextField(null=True, blank=True)
    sum = models.DecimalField(max_digits=13, decimal_places=4, null=True, blank=True)
    fee = models.DecimalField(max_digits=13, decimal_places=4, null=True, blank=True)
    event_id = models.TextField(null=True, blank=True)
    for_what = models.TextField(db_column="For", null=True, blank=True)
    items = models.TextField(db_column="Items", null=True, blank=True)
    discount_code = models.TextField(db_column="Discount Code", null=True, blank=True)
    note = models.TextField(db_column="Note", null=True, blank=True)
    name = models.TextField(db_column="Name", null=True, blank=True)
    contact_person = models.TextField(db_column="Contact Person", null=True, blank=True)
    full_address = models.TextField(db_column="Full Address", null=True, blank=True)
    street = models.TextField(db_column="Street", null=True, blank=True)
    city = models.TextField(db_column="City", null=True, blank=True)
    state_province = models.TextField(db_column="State/Province", null=True, blank=True)
    postal_code = models.TextField(db_column="Postal Code", null=True, blank=True)
    country = models.TextField(db_column="Country", null=True, blank=True)
    phone = models.TextField(db_column="Phone", null=True, blank=True)
    email = models.TextField(db_column="Email", null=True, blank=True)

    _allowed_missing_fields = [
        "sid",
        "uid",
        "eid",
        "fee",
        "sum",
    ]
    _api_names_override = {
        "event_id": "eid",
        "timestamp": "_dp",
        "type": "Transaction Type",
        "for_what": "Reference",
    }
    _date_fields = {
        "_dp": None,
    }

    def __str__(self):
        return f"{self.type} [{self.member if self.member else self.name}] {self.timestamp}"

    class Meta:
        db_table = "transactions"


class EventCategory(models.Model):
    id = models.IntegerField(primary_key=True)
    title = models.TextField()

    @classmethod
    def from_api_dict(cls, id: int, data):
        return cls(id=id, title=data["ttl"])

    def __str__(self):
        return self.title


class Event(BaseModel):
    class EventCalendar(models.IntegerChoices):
        HIDDEN = 0
        GREEN = 1
        RED = 2
        YELLOW = 3
        BLUE = 4
        PURPLE = 5
        MAGENTA = 6
        GREY = 7
        TEAL = 8

    eid = models.CharField(max_length=255, primary_key=True)
    url = models.TextField()
    title = models.TextField()
    start = models.DateTimeField()
    end = models.DateTimeField(null=True, blank=True)
    cap = models.IntegerField(null=True, blank=True)
    count = models.IntegerField()
    category = models.ForeignKey(EventCategory, on_delete=models.PROTECT)
    calendar = models.IntegerField(choices=EventCalendar)
    venue = models.TextField(null=True, blank=True)
    occurred = models.GeneratedField(
        expression=~(Q(cap=0) | Q(count=0) | Q(calendar=EventCalendar.HIDDEN)),
        output_field=models.BooleanField(),
        db_persist=False,
    )
    # TODO:
    # "lgo": {
    #   "l": "https://d1tif55lvfk8gc.cloudfront.net/656e3842ae3975908b05e304.jpg?1673405126",
    #   "s": "https://d1tif55lvfk8gc.cloudfront.net/656e3842ae3975908b05e304s.jpg?1673405126"
    # },

    _api_names_override = {
        "title": "ttl",
        "category_id": "grp",
        "start": "sdp",
        "end": "edp",
        "count": "cnt",
        "calendar": "cal",
        "venue": "adn",
    }

    _date_fields = {
        "sdp": None,
        "edp": None,
    }

    _allowed_missing_fields = ["cap", "edp", "adn"]

    def __str__(self):
        return self.title


class EventInstructor(models.Model):
    name = models.TextField(blank=True)
    member = models.OneToOneField(
        Member, on_delete=models.PROTECT, null=True, blank=True, db_constraint=False
    )

    def __str__(self):
        return str(self.member) if self.member else self.name


class EventExtQuerySet(models.QuerySet["EventExt"]):
    def summarize(self, aggregate: bool = False):
        method = self.aggregate if aggregate else self.annotate
        return method(
            count__sum=Sum("count", filter=F("occurred")),
            instructor__count=Count("instructor", distinct=True, filter=F("occurred")),
            meetings__sum=Sum("meetings", filter=F("occurred")),
            duration__sum=Sum("duration", filter=F("occurred")),
            person_hours__sum=Sum("person_hours", filter=F("occurred")),
            event_count=Count("eid", filter=F("occurred")),
            canceled_event_count=Count("eid", filter=~F("occurred")),
        )


class EventExtManager(models.Manager["EventExt"]):
    def get_queryset(self) -> models.QuerySet["EventExt"]:
        return (
            super()
            .get_queryset()
            .annotate(
                meetings=Subquery(
                    EventMeetingTime.objects.filter(event=OuterRef("pk"))
                    .values("event__pk")
                    .annotate(d=Count("pk"))
                    .values("d")[:1],
                    output_field=models.IntegerField(),
                ),
                duration=Subquery(
                    EventMeetingTime.objects.filter(event=OuterRef("pk"))
                    .values("event__pk")
                    .annotate(d=Sum("duration"))
                    .values("d")[:1],
                    output_field=models.DurationField(),
                ),
                person_hours=ExpressionWrapper(
                    ExpressionWrapper(F("duration"), models.IntegerField())
                    * F("count"),
                    models.DurationField(),
                ),
            )
        )


class EventExt(Event):
    """Extension of `Event` to capture some fields not supported in MembershipWorks"""

    objects = EventExtManager.from_queryset(EventExtQuerySet)()

    instructor = models.ForeignKey(
        EventInstructor, on_delete=models.PROTECT, null=True, blank=True
    )
    materials_fee = models.DecimalField(
        max_digits=13, decimal_places=4, null=True, blank=True
    )
    materials_fee_included_in_price = models.BooleanField(null=True)
    instructor_percentage = models.DecimalField(
        max_digits=5, decimal_places=4, default=0.5
    )
    instructor_flat_rate = models.DecimalField(
        max_digits=13, decimal_places=4, default=0
    )

    class Meta:
        verbose_name = "event"
        ordering = ["-start"]


class EventMeetingTime(models.Model):
    event = models.ForeignKey(
        EventExt, on_delete=models.CASCADE, related_name="meeting_times"
    )
    start = models.DateTimeField()
    end = models.DateTimeField()

    duration = models.GeneratedField(
        expression=F("end") - F("start"),
        output_field=models.DurationField(),
        db_persist=False,
    )

    class Meta:
        constraints = [
            models.UniqueConstraint(
                fields=["event", "start", "end"], name="unique_event_start_end"
            )
        ]