from typing import Optional
from datetime import datetime

import django.core.mail.message
from django.conf import settings
from django.db import models
from django.db.models import Exists, F, OuterRef, 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:
                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)
    # 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 EventExtManager(models.Manager["EventExt"]):
    def get_queryset(self) -> models.QuerySet["EventExt"]:
        return (
            super()
            .get_queryset()
            .annotate(
                duration=Subquery(
                    EventMeetingTime.objects.filter(event=OuterRef("pk"))
                    .values("event__pk")
                    .annotate(d=Sum("duration"))
                    .values("d")[:1],
                    output_field=models.DurationField(),
                ),
            )
        )


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

    objects = EventExtManager()

    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
    )
    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
    )

    # TODO: ideally this would be a generated column or annotation,
    #       but I couldn't get the types to work out
    @property
    def person_hours(self):
        if self.duration is None:
            return None
        return self.count * self.duration

    class Meta:
        verbose_name = "event"


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"
            )
        ]