notifications-api/app/models.py

import datetime
import itertools
import uuid

from flask import current_app, url_for
from notifications_utils.clients.encryption.encryption_client import (
    EncryptionError,
)
from notifications_utils.recipients import (
    InvalidEmailError,
    InvalidPhoneError,
    try_validate_and_format_phone_number,
    validate_email_address,
    validate_phone_number,
)
from notifications_utils.template import (
    LetterPrintTemplate,
    PlainTextEmailTemplate,
    SMSMessageTemplate,
)
from notifications_utils.timezones import convert_utc_to_local_timezone
from sqlalchemy import (
    CheckConstraint,
    Index,
    String,
    UniqueConstraint,
    and_,
    func,
)
from sqlalchemy.dialects.postgresql import JSON, JSONB, UUID
from sqlalchemy.ext.associationproxy import association_proxy
from sqlalchemy.ext.declarative import declared_attr
from sqlalchemy.orm import validates
from sqlalchemy.orm.collections import attribute_mapped_collection

from app import db, encryption
from app.hashing import check_hash, hashpw
from app.history_meta import Versioned
from app.utils import (
    DATETIME_FORMAT,
    DATETIME_FORMAT_NO_TIMEZONE,
    get_dt_string_or_none,
)

SMS_TYPE = 'sms'
EMAIL_TYPE = 'email'
LETTER_TYPE = 'letter'

TEMPLATE_TYPES = [SMS_TYPE, EMAIL_TYPE, LETTER_TYPE]
NOTIFICATION_TYPES = [SMS_TYPE, EMAIL_TYPE, LETTER_TYPE]

template_types = db.Enum(*TEMPLATE_TYPES, name='template_type')

NORMAL = 'normal'
PRIORITY = 'priority'
TEMPLATE_PROCESS_TYPE = [NORMAL, PRIORITY]


SMS_AUTH_TYPE = 'sms_auth'
EMAIL_AUTH_TYPE = 'email_auth'
WEBAUTHN_AUTH_TYPE = 'webauthn_auth'
USER_AUTH_TYPES = [SMS_AUTH_TYPE, EMAIL_AUTH_TYPE, WEBAUTHN_AUTH_TYPE]

DELIVERY_STATUS_CALLBACK_TYPE = 'delivery_status'
COMPLAINT_CALLBACK_TYPE = 'complaint'
SERVICE_CALLBACK_TYPES = [DELIVERY_STATUS_CALLBACK_TYPE, COMPLAINT_CALLBACK_TYPE]


def filter_null_value_fields(obj):
    return dict(
        filter(lambda x: x[1] is not None, obj.items())
    )


class HistoryModel:
    @classmethod
    def from_original(cls, original):
        history = cls()
        history.update_from_original(original)
        return history

    def update_from_original(self, original):
        for c in self.__table__.columns:
            # in some cases, columns may have different names to their underlying db column -  so only copy those
            # that we can, and leave it up to subclasses to deal with any oddities/properties etc.
            if hasattr(original, c.name):
                setattr(self, c.name, getattr(original, c.name))
            else:
                current_app.logger.debug('{} has no column {} to copy from'.format(original, c.name))


class User(db.Model):
    __tablename__ = 'users'

    id = db.Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    name = db.Column(db.String, nullable=False, index=True, unique=False)
    email_address = db.Column(db.String(255), nullable=False, index=True, unique=True)
    created_at = db.Column(
        db.DateTime,
        index=False,
        unique=False,
        nullable=False,
        default=datetime.datetime.utcnow)
    updated_at = db.Column(
        db.DateTime,
        index=False,
        unique=False,
        nullable=True,
        onupdate=datetime.datetime.utcnow)
    _password = db.Column(db.String, index=False, unique=False, nullable=False)
    mobile_number = db.Column(db.String, index=False, unique=False, nullable=True)
    password_changed_at = db.Column(db.DateTime, index=False, unique=False, nullable=False,
                                    default=datetime.datetime.utcnow)
    logged_in_at = db.Column(db.DateTime, nullable=True)
    failed_login_count = db.Column(db.Integer, nullable=False, default=0)
    state = db.Column(db.String, nullable=False, default='pending')
    platform_admin = db.Column(db.Boolean, nullable=False, default=False)
    current_session_id = db.Column(UUID(as_uuid=True), nullable=True)
    auth_type = db.Column(
        db.String, db.ForeignKey('auth_type.name'), index=True, nullable=False, default=EMAIL_AUTH_TYPE
    )
    email_access_validated_at = db.Column(
        db.DateTime, index=False, unique=False, nullable=False, default=datetime.datetime.utcnow
    )

    # either email auth or a mobile number must be provided
    CheckConstraint("auth_type in ('email_auth', 'webauthn_auth') or mobile_number is not null")

    services = db.relationship(
        'Service',
        secondary='user_to_service',
        backref='users')
    organisations = db.relationship(
        'Organisation',
        secondary='user_to_organisation',
        backref='users')

    @validates("mobile_number")
    def validate_mobile_number(self, key, number):
        try:
            if number is not None:
                return validate_phone_number(number, international=True)
        except InvalidPhoneError as err:
            raise ValueError(str(err)) from err

    @property
    def password(self):
        raise AttributeError("Password not readable")

    @property
    def can_use_webauthn(self):
        if self.platform_admin:
            return True

        if self.auth_type == 'webauthn_auth':
            return True

        return any(
            str(service.id) == current_app.config['NOTIFY_SERVICE_ID']
            for service in self.services
        )

    @password.setter
    def password(self, password):
        self._password = hashpw(password)

    def check_password(self, password):
        return check_hash(password, self._password)

    def get_permissions(self, service_id=None):
        from app.dao.permissions_dao import permission_dao

        if service_id:
            return [
                x.permission for x in permission_dao.get_permissions_by_user_id_and_service_id(self.id, service_id)
            ]

        retval = {}
        for x in permission_dao.get_permissions_by_user_id(self.id):
            service_id = str(x.service_id)
            if service_id not in retval:
                retval[service_id] = []
            retval[service_id].append(x.permission)
        return retval

    def serialize(self):
        return {
            'id': self.id,
            'name': self.name,
            'email_address': self.email_address,
            'auth_type': self.auth_type,
            'current_session_id': self.current_session_id,
            'failed_login_count': self.failed_login_count,
            'email_access_validated_at': self.email_access_validated_at.strftime(DATETIME_FORMAT),
            'logged_in_at': get_dt_string_or_none(self.logged_in_at),
            'mobile_number': self.mobile_number,
            'organisations': [x.id for x in self.organisations if x.active],
            'password_changed_at': self.password_changed_at.strftime(DATETIME_FORMAT_NO_TIMEZONE),
            'permissions': self.get_permissions(),
            'platform_admin': self.platform_admin,
            'services': [x.id for x in self.services if x.active],
            'can_use_webauthn': self.can_use_webauthn,
            'state': self.state,
        }

    def serialize_for_users_list(self):
        return {
            'id': self.id,
            'name': self.name,
            'email_address': self.email_address,
            'mobile_number': self.mobile_number,
        }


class ServiceUser(db.Model):
    __tablename__ = 'user_to_service'
    user_id = db.Column(UUID(as_uuid=True), db.ForeignKey('users.id'), primary_key=True)
    service_id = db.Column(UUID(as_uuid=True), db.ForeignKey('services.id'), primary_key=True)

    __table_args__ = (
        UniqueConstraint('user_id', 'service_id', name='uix_user_to_service'),
    )


user_to_organisation = db.Table(
    'user_to_organisation',
    db.Model.metadata,
    db.Column('user_id', UUID(as_uuid=True), db.ForeignKey('users.id')),
    db.Column('organisation_id', UUID(as_uuid=True), db.ForeignKey('organisation.id')),
    UniqueConstraint('user_id', 'organisation_id', name='uix_user_to_organisation')
)


user_folder_permissions = db.Table(
    'user_folder_permissions',
    db.Model.metadata,
    db.Column('user_id', UUID(as_uuid=True), primary_key=True),
    db.Column('template_folder_id', UUID(as_uuid=True), db.ForeignKey('template_folder.id'), primary_key=True),
    db.Column('service_id', UUID(as_uuid=True), primary_key=True),
    db.ForeignKeyConstraint(['user_id', 'service_id'], ['user_to_service.user_id', 'user_to_service.service_id']),
    db.ForeignKeyConstraint(['template_folder_id', 'service_id'], ['template_folder.id', 'template_folder.service_id'])
)


BRANDING_GOVUK = 'govuk'  # Deprecated outside migrations
BRANDING_ORG = 'org'
BRANDING_BOTH = 'both'
BRANDING_ORG_BANNER = 'org_banner'
BRANDING_TYPES = [BRANDING_ORG, BRANDING_BOTH, BRANDING_ORG_BANNER]


class BrandingTypes(db.Model):
    __tablename__ = 'branding_type'
    name = db.Column(db.String(255), primary_key=True)


class EmailBranding(db.Model):
    __tablename__ = 'email_branding'
    id = db.Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    colour = db.Column(db.String(7), nullable=True)
    logo = db.Column(db.String(255), nullable=True)
    name = db.Column(db.String(255), unique=True, nullable=False)
    text = db.Column(db.String(255), nullable=True)
    brand_type = db.Column(
        db.String(255),
        db.ForeignKey('branding_type.name'),
        index=True,
        nullable=False,
        default=BRANDING_ORG
    )

    def serialize(self):
        serialized = {
            "id": str(self.id),
            "colour": self.colour,
            "logo": self.logo,
            "name": self.name,
            "text": self.text,
            "brand_type": self.brand_type
        }

        return serialized


service_email_branding = db.Table(
    'service_email_branding',
    db.Model.metadata,
    # service_id is a primary key as you can only have one email branding per service
    db.Column('service_id', UUID(as_uuid=True), db.ForeignKey('services.id'), primary_key=True, nullable=False),
    db.Column('email_branding_id', UUID(as_uuid=True), db.ForeignKey('email_branding.id'), nullable=False),
)


INTERNATIONAL_SMS_TYPE = 'international_sms'
INBOUND_SMS_TYPE = 'inbound_sms'
SCHEDULE_NOTIFICATIONS = 'schedule_notifications'
EMAIL_AUTH = 'email_auth'
UPLOAD_DOCUMENT = 'upload_document'
EDIT_FOLDER_PERMISSIONS = 'edit_folder_permissions'

SERVICE_PERMISSION_TYPES = [
    EMAIL_TYPE,
    SMS_TYPE,
    INTERNATIONAL_SMS_TYPE,
    INBOUND_SMS_TYPE,
    SCHEDULE_NOTIFICATIONS,
    EMAIL_AUTH,
    UPLOAD_DOCUMENT,
    EDIT_FOLDER_PERMISSIONS,
]


class ServicePermissionTypes(db.Model):
    __tablename__ = 'service_permission_types'

    name = db.Column(db.String(255), primary_key=True)


class Domain(db.Model):
    __tablename__ = "domain"
    domain = db.Column(db.String(255), primary_key=True)
    organisation_id = db.Column('organisation_id', UUID(as_uuid=True), db.ForeignKey('organisation.id'), nullable=False)


ORGANISATION_TYPES = [
    "federal", "state", "other"
]


class OrganisationTypes(db.Model):
    __tablename__ = 'organisation_types'

    name = db.Column(db.String(255), primary_key=True)
    is_crown = db.Column(db.Boolean, nullable=True)
    annual_free_sms_fragment_limit = db.Column(db.BigInteger, nullable=False)


class Organisation(db.Model):
    __tablename__ = "organisation"
    id = db.Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4, unique=False)
    name = db.Column(db.String(255), nullable=False, unique=True, index=True)
    active = db.Column(db.Boolean, nullable=False, default=True)
    created_at = db.Column(db.DateTime, nullable=False, default=datetime.datetime.utcnow)
    updated_at = db.Column(db.DateTime, nullable=True, onupdate=datetime.datetime.utcnow)
    agreement_signed = db.Column(db.Boolean, nullable=True)
    agreement_signed_at = db.Column(db.DateTime, nullable=True)
    agreement_signed_by_id = db.Column(
        UUID(as_uuid=True),
        db.ForeignKey('users.id'),
        nullable=True,
    )
    agreement_signed_by = db.relationship('User')
    agreement_signed_on_behalf_of_name = db.Column(db.String(255), nullable=True)
    agreement_signed_on_behalf_of_email_address = db.Column(db.String(255), nullable=True)
    agreement_signed_version = db.Column(db.Float, nullable=True)
    crown = db.Column(db.Boolean, nullable=True)
    organisation_type = db.Column(
        db.String(255),
        db.ForeignKey('organisation_types.name'),
        unique=False,
        nullable=True,
    )
    request_to_go_live_notes = db.Column(db.Text)

    domains = db.relationship(
        'Domain',
    )

    email_branding = db.relationship('EmailBranding')
    email_branding_id = db.Column(
        UUID(as_uuid=True),
        db.ForeignKey('email_branding.id'),
        nullable=True,
    )

    notes = db.Column(db.Text, nullable=True)
    purchase_order_number = db.Column(db.String(255), nullable=True)
    billing_contact_names = db.Column(db.Text, nullable=True)
    billing_contact_email_addresses = db.Column(db.Text, nullable=True)
    billing_reference = db.Column(db.String(255), nullable=True)

    @property
    def live_services(self):
        return [
            service for service in self.services
            if service.active and not service.restricted
        ]

    @property
    def domain_list(self):
        return [
            domain.domain for domain in self.domains
        ]

    def serialize(self):
        return {
            "id": str(self.id),
            "name": self.name,
            "active": self.active,
            "crown": self.crown,
            "organisation_type": self.organisation_type,
            "email_branding_id": self.email_branding_id,
            "agreement_signed": self.agreement_signed,
            "agreement_signed_at": self.agreement_signed_at,
            "agreement_signed_by_id": self.agreement_signed_by_id,
            "agreement_signed_on_behalf_of_name": self.agreement_signed_on_behalf_of_name,
            "agreement_signed_on_behalf_of_email_address": self.agreement_signed_on_behalf_of_email_address,
            "agreement_signed_version": self.agreement_signed_version,
            "domains": self.domain_list,
            "request_to_go_live_notes": self.request_to_go_live_notes,
            "count_of_live_services": len(self.live_services),
            "notes": self.notes,
            "purchase_order_number": self.purchase_order_number,
            "billing_contact_names": self.billing_contact_names,
            "billing_contact_email_addresses": self.billing_contact_email_addresses,
            "billing_reference": self.billing_reference,
        }

    def serialize_for_list(self):
        return {
            'name': self.name,
            'id': str(self.id),
            'active': self.active,
            'count_of_live_services': len(self.live_services),
            'domains': self.domain_list,
            'organisation_type': self.organisation_type,
        }


class Service(db.Model, Versioned):
    __tablename__ = 'services'

    id = db.Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    name = db.Column(db.String(255), nullable=False, unique=True)
    created_at = db.Column(
        db.DateTime,
        index=False,
        unique=False,
        nullable=False,
        default=datetime.datetime.utcnow)
    updated_at = db.Column(
        db.DateTime,
        index=False,
        unique=False,
        nullable=True,
        onupdate=datetime.datetime.utcnow)
    active = db.Column(db.Boolean, index=False, unique=False, nullable=False, default=True)
    message_limit = db.Column(db.BigInteger, index=False, unique=False, nullable=False)
    restricted = db.Column(db.Boolean, index=False, unique=False, nullable=False)
    research_mode = db.Column(db.Boolean, index=False, unique=False, nullable=False, default=False)
    email_from = db.Column(db.Text, index=False, unique=True, nullable=False)
    created_by_id = db.Column(UUID(as_uuid=True), db.ForeignKey('users.id'), index=True, nullable=False)
    created_by = db.relationship('User', foreign_keys=[created_by_id])
    prefix_sms = db.Column(db.Boolean, nullable=False, default=True)
    organisation_type = db.Column(
        db.String(255),
        db.ForeignKey('organisation_types.name'),
        unique=False,
        nullable=True,
    )
    crown = db.Column(db.Boolean, index=False, nullable=True)
    rate_limit = db.Column(db.Integer, index=False, nullable=False, default=3000)
    contact_link = db.Column(db.String(255), nullable=True, unique=False)
    volume_sms = db.Column(db.Integer(), nullable=True, unique=False)
    volume_email = db.Column(db.Integer(), nullable=True, unique=False)
    volume_letter = db.Column(db.Integer(), nullable=True, unique=False)
    consent_to_research = db.Column(db.Boolean, nullable=True)
    count_as_live = db.Column(db.Boolean, nullable=False, default=True)
    go_live_user_id = db.Column(UUID(as_uuid=True), db.ForeignKey('users.id'), nullable=True)
    go_live_user = db.relationship('User', foreign_keys=[go_live_user_id])
    go_live_at = db.Column(db.DateTime, nullable=True)

    organisation_id = db.Column(UUID(as_uuid=True), db.ForeignKey('organisation.id'), index=True, nullable=True)
    organisation = db.relationship('Organisation', backref='services')

    notes = db.Column(db.Text, nullable=True)
    purchase_order_number = db.Column(db.String(255), nullable=True)
    billing_contact_names = db.Column(db.Text, nullable=True)
    billing_contact_email_addresses = db.Column(db.Text, nullable=True)
    billing_reference = db.Column(db.String(255), nullable=True)

    email_branding = db.relationship(
        'EmailBranding',
        secondary=service_email_branding,
        uselist=False,
        backref=db.backref('services', lazy='dynamic'))

    @classmethod
    def from_json(cls, data):
        """
        Assumption: data has been validated appropriately.

        Returns a Service object based on the provided data. Deserialises created_by to created_by_id as marshmallow
        would.
        """
        # validate json with marshmallow
        fields = data.copy()

        fields['created_by_id'] = fields.pop('created_by')

        return cls(**fields)

    def get_inbound_number(self):
        if self.inbound_number and self.inbound_number.active:
            return self.inbound_number.number

    def get_default_sms_sender(self):
        default_sms_sender = [x for x in self.service_sms_senders if x.is_default]
        return default_sms_sender[0].sms_sender

    def get_default_reply_to_email_address(self):
        default_reply_to = [x for x in self.reply_to_email_addresses if x.is_default]
        return default_reply_to[0].email_address if default_reply_to else None

    def get_default_letter_contact(self):
        default_letter_contact = [x for x in self.letter_contacts if x.is_default]
        return default_letter_contact[0].contact_block if default_letter_contact else None

    def has_permission(self, permission):
        return permission in [p.permission for p in self.permissions]

    def serialize_for_org_dashboard(self):
        return {
            'id': str(self.id),
            'name': self.name,
            'active': self.active,
            'restricted': self.restricted,
            'research_mode': self.research_mode
        }


class AnnualBilling(db.Model):
    __tablename__ = "annual_billing"
    id = db.Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4, unique=False)
    service_id = db.Column(UUID(as_uuid=True), db.ForeignKey('services.id'), unique=False, index=True, nullable=False)
    financial_year_start = db.Column(db.Integer, nullable=False, default=True, unique=False)
    free_sms_fragment_limit = db.Column(db.Integer, nullable=False, index=False, unique=False)
    updated_at = db.Column(db.DateTime, nullable=True, onupdate=datetime.datetime.utcnow)
    created_at = db.Column(db.DateTime, nullable=False, default=datetime.datetime.utcnow)
    UniqueConstraint('financial_year_start', 'service_id', name='ix_annual_billing_service_id')
    service = db.relationship(Service, backref=db.backref("annual_billing", uselist=True))

    __table_args__ = (UniqueConstraint(
        'service_id', 'financial_year_start', name='uix_service_id_financial_year_start'),)

    def serialize_free_sms_items(self):
        return {
            'free_sms_fragment_limit': self.free_sms_fragment_limit,
            'financial_year_start': self.financial_year_start,
        }

    def serialize(self):
        def serialize_service():
            return {
                "id": str(self.service_id),
                "name": self.service.name
            }

        return {
            "id": str(self.id),
            'free_sms_fragment_limit': self.free_sms_fragment_limit,
            'service_id': self.service_id,
            'financial_year_start': self.financial_year_start,
            "created_at": self.created_at.strftime(DATETIME_FORMAT),
            "updated_at": get_dt_string_or_none(self.updated_at),
            "service": serialize_service() if self.service else None,
        }


class InboundNumber(db.Model):
    __tablename__ = "inbound_numbers"

    id = db.Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    number = db.Column(db.String(11), unique=True, nullable=False)
    provider = db.Column(db.String(), nullable=False)
    service_id = db.Column(UUID(as_uuid=True), db.ForeignKey('services.id'), unique=True, index=True, nullable=True)
    service = db.relationship(Service, backref=db.backref("inbound_number", uselist=False))
    active = db.Column(db.Boolean, index=False, unique=False, nullable=False, default=True)
    created_at = db.Column(db.DateTime, default=datetime.datetime.utcnow, nullable=False)
    updated_at = db.Column(db.DateTime, nullable=True, onupdate=datetime.datetime.utcnow)

    def serialize(self):
        def serialize_service():
            return {
                "id": str(self.service_id),
                "name": self.service.name
            }

        return {
            "id": str(self.id),
            "number": self.number,
            "provider": self.provider,
            "service": serialize_service() if self.service else None,
            "active": self.active,
            "created_at": self.created_at.strftime(DATETIME_FORMAT),
            "updated_at": get_dt_string_or_none(self.updated_at),
        }


class ServiceSmsSender(db.Model):
    __tablename__ = "service_sms_senders"

    id = db.Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    sms_sender = db.Column(db.String(11), nullable=False)
    service_id = db.Column(UUID(as_uuid=True), db.ForeignKey('services.id'), index=True, nullable=False, unique=False)
    service = db.relationship(Service, backref=db.backref("service_sms_senders", uselist=True))
    is_default = db.Column(db.Boolean, nullable=False, default=True)
    archived = db.Column(db.Boolean, nullable=False, default=False)
    inbound_number_id = db.Column(UUID(as_uuid=True), db.ForeignKey('inbound_numbers.id'),
                                  unique=True, index=True, nullable=True)
    inbound_number = db.relationship(InboundNumber, backref=db.backref("inbound_number", uselist=False))
    created_at = db.Column(db.DateTime, default=datetime.datetime.utcnow, nullable=False)
    updated_at = db.Column(db.DateTime, nullable=True, onupdate=datetime.datetime.utcnow)

    def get_reply_to_text(self):
        return try_validate_and_format_phone_number(self.sms_sender)

    def serialize(self):
        return {
            "id": str(self.id),
            "sms_sender": self.sms_sender,
            "service_id": str(self.service_id),
            "is_default": self.is_default,
            "archived": self.archived,
            "inbound_number_id": str(self.inbound_number_id) if self.inbound_number_id else None,
            "created_at": self.created_at.strftime(DATETIME_FORMAT),
            "updated_at": get_dt_string_or_none(self.updated_at),
        }


class ServicePermission(db.Model):
    __tablename__ = "service_permissions"

    service_id = db.Column(UUID(as_uuid=True), db.ForeignKey('services.id'),
                           primary_key=True, index=True, nullable=False)
    permission = db.Column(db.String(255), db.ForeignKey('service_permission_types.name'),
                           index=True, primary_key=True, nullable=False)
    created_at = db.Column(db.DateTime, default=datetime.datetime.utcnow, nullable=False)

    service_permission_types = db.relationship(
        Service, backref=db.backref("permissions", cascade="all, delete-orphan"))

    def __repr__(self):
        return '<{} has service permission: {}>'.format(self.service_id, self.permission)


MOBILE_TYPE = 'mobile'
EMAIL_TYPE = 'email'

GUEST_LIST_RECIPIENT_TYPE = [MOBILE_TYPE, EMAIL_TYPE]
guest_list_recipient_types = db.Enum(*GUEST_LIST_RECIPIENT_TYPE, name='recipient_type')


class ServiceGuestList(db.Model):
    __tablename__ = 'service_whitelist'

    id = db.Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    service_id = db.Column(UUID(as_uuid=True), db.ForeignKey('services.id'), index=True, nullable=False)
    service = db.relationship('Service', backref='guest_list')
    recipient_type = db.Column(guest_list_recipient_types, nullable=False)
    recipient = db.Column(db.String(255), nullable=False)
    created_at = db.Column(db.DateTime, default=datetime.datetime.utcnow)

    @classmethod
    def from_string(cls, service_id, recipient_type, recipient):
        instance = cls(service_id=service_id, recipient_type=recipient_type)

        try:
            if recipient_type == MOBILE_TYPE:
                instance.recipient = validate_phone_number(recipient, international=True)
            elif recipient_type == EMAIL_TYPE:
                instance.recipient = validate_email_address(recipient)
            else:
                raise ValueError('Invalid recipient type')
        except InvalidPhoneError:
            raise ValueError('Invalid guest list: "{}"'.format(recipient))
        except InvalidEmailError:
            raise ValueError('Invalid guest list: "{}"'.format(recipient))
        else:
            return instance

    def __repr__(self):
        return 'Recipient {} of type: {}'.format(self.recipient, self.recipient_type)


class ServiceInboundApi(db.Model, Versioned):
    __tablename__ = 'service_inbound_api'
    id = db.Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    service_id = db.Column(UUID(as_uuid=True), db.ForeignKey('services.id'), index=True, nullable=False, unique=True)
    service = db.relationship('Service', backref='inbound_api')
    url = db.Column(db.String(), nullable=False)
    _bearer_token = db.Column("bearer_token", db.String(), nullable=False)
    created_at = db.Column(db.DateTime, default=datetime.datetime.utcnow, nullable=False)
    updated_at = db.Column(db.DateTime, nullable=True)
    updated_by = db.relationship('User')
    updated_by_id = db.Column(UUID(as_uuid=True), db.ForeignKey('users.id'), index=True, nullable=False)

    @property
    def bearer_token(self):
        if self._bearer_token:
            return encryption.decrypt(self._bearer_token)
        return None

    @bearer_token.setter
    def bearer_token(self, bearer_token):
        if bearer_token:
            self._bearer_token = encryption.encrypt(str(bearer_token))

    def serialize(self):
        return {
            "id": str(self.id),
            "service_id": str(self.service_id),
            "url": self.url,
            "updated_by_id": str(self.updated_by_id),
            "created_at": self.created_at.strftime(DATETIME_FORMAT),
            "updated_at": get_dt_string_or_none(self.updated_at),
        }


class ServiceCallbackApi(db.Model, Versioned):
    __tablename__ = 'service_callback_api'
    id = db.Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    service_id = db.Column(UUID(as_uuid=True), db.ForeignKey('services.id'), index=True, nullable=False)
    service = db.relationship('Service', backref='service_callback_api')
    url = db.Column(db.String(), nullable=False)
    callback_type = db.Column(db.String(), db.ForeignKey('service_callback_type.name'), nullable=True)
    _bearer_token = db.Column("bearer_token", db.String(), nullable=False)
    created_at = db.Column(db.DateTime, default=datetime.datetime.utcnow, nullable=False)
    updated_at = db.Column(db.DateTime, nullable=True)
    updated_by = db.relationship('User')
    updated_by_id = db.Column(UUID(as_uuid=True), db.ForeignKey('users.id'), index=True, nullable=False)

    __table_args__ = (
        UniqueConstraint('service_id', 'callback_type', name='uix_service_callback_type'),
    )

    @property
    def bearer_token(self):
        if self._bearer_token:
            return encryption.decrypt(self._bearer_token)
        return None

    @bearer_token.setter
    def bearer_token(self, bearer_token):
        if bearer_token:
            self._bearer_token = encryption.encrypt(str(bearer_token))

    def serialize(self):
        return {
            "id": str(self.id),
            "service_id": str(self.service_id),
            "url": self.url,
            "updated_by_id": str(self.updated_by_id),
            "created_at": self.created_at.strftime(DATETIME_FORMAT),
            "updated_at": get_dt_string_or_none(self.updated_at),
        }


class ServiceCallbackType(db.Model):
    __tablename__ = 'service_callback_type'

    name = db.Column(db.String, primary_key=True)


class ApiKey(db.Model, Versioned):
    __tablename__ = 'api_keys'

    id = db.Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    name = db.Column(db.String(255), nullable=False)
    _secret = db.Column("secret", db.String(255), unique=True, nullable=False)
    service_id = db.Column(UUID(as_uuid=True), db.ForeignKey('services.id'), index=True, nullable=False)
    service = db.relationship('Service', backref='api_keys')
    key_type = db.Column(db.String(255), db.ForeignKey('key_types.name'), index=True, nullable=False)
    expiry_date = db.Column(db.DateTime)
    created_at = db.Column(
        db.DateTime,
        index=False,
        unique=False,
        nullable=False,
        default=datetime.datetime.utcnow)
    updated_at = db.Column(
        db.DateTime,
        index=False,
        unique=False,
        nullable=True,
        onupdate=datetime.datetime.utcnow)
    created_by = db.relationship('User')
    created_by_id = db.Column(UUID(as_uuid=True), db.ForeignKey('users.id'), index=True, nullable=False)

    __table_args__ = (
        Index('uix_service_to_key_name', 'service_id', 'name', unique=True, postgresql_where=expiry_date.is_(None)),
    )

    @property
    def secret(self):
        if self._secret:
            return encryption.decrypt(self._secret)
        return None

    @secret.setter
    def secret(self, secret):
        if secret:
            self._secret = encryption.encrypt(str(secret))


KEY_TYPE_NORMAL = 'normal'
KEY_TYPE_TEAM = 'team'
KEY_TYPE_TEST = 'test'


class KeyTypes(db.Model):
    __tablename__ = 'key_types'

    name = db.Column(db.String(255), primary_key=True)


class TemplateProcessTypes(db.Model):
    __tablename__ = 'template_process_type'
    name = db.Column(db.String(255), primary_key=True)


class TemplateFolder(db.Model):
    __tablename__ = 'template_folder'

    id = db.Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    service_id = db.Column(UUID(as_uuid=True), db.ForeignKey('services.id'), nullable=False)
    name = db.Column(db.String, nullable=False)
    parent_id = db.Column(UUID(as_uuid=True), db.ForeignKey('template_folder.id'), nullable=True)

    service = db.relationship('Service', backref='all_template_folders')
    parent = db.relationship('TemplateFolder', remote_side=[id], backref='subfolders')
    users = db.relationship(
        'ServiceUser',
        uselist=True,
        backref=db.backref('folders', foreign_keys='user_folder_permissions.c.template_folder_id'),
        secondary='user_folder_permissions',
        primaryjoin='TemplateFolder.id == user_folder_permissions.c.template_folder_id'
    )

    __table_args__ = (
        UniqueConstraint('id', 'service_id', name='ix_id_service_id'), {}
    )

    def serialize(self):
        return {
            'id': self.id,
            'name': self.name,
            'parent_id': self.parent_id,
            'service_id': self.service_id,
            'users_with_permission': self.get_users_with_permission()
        }

    def is_parent_of(self, other):
        while other.parent is not None:
            if other.parent == self:
                return True
            other = other.parent
        return False

    def get_users_with_permission(self):
        service_users = self.users
        users_with_permission = [str(service_user.user_id) for service_user in service_users]

        return users_with_permission


template_folder_map = db.Table(
    'template_folder_map',
    db.Model.metadata,
    # template_id is a primary key as a template can only belong in one folder
    db.Column('template_id', UUID(as_uuid=True), db.ForeignKey('templates.id'), primary_key=True, nullable=False),
    db.Column('template_folder_id', UUID(as_uuid=True), db.ForeignKey('template_folder.id'), nullable=False),
)


class TemplateBase(db.Model):
    __abstract__ = True

    def __init__(self, **kwargs):
        if 'template_type' in kwargs:
            self.template_type = kwargs.pop('template_type')

        super().__init__(**kwargs)

    id = db.Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    name = db.Column(db.String(255), nullable=False)
    template_type = db.Column(template_types, nullable=False)
    created_at = db.Column(db.DateTime, nullable=False, default=datetime.datetime.utcnow)
    updated_at = db.Column(db.DateTime, onupdate=datetime.datetime.utcnow)
    content = db.Column(db.Text, nullable=False)
    archived = db.Column(db.Boolean, nullable=False, default=False)
    hidden = db.Column(db.Boolean, nullable=False, default=False)
    subject = db.Column(db.Text)

    @declared_attr
    def service_id(cls):
        return db.Column(UUID(as_uuid=True), db.ForeignKey('services.id'), index=True, nullable=False)

    @declared_attr
    def created_by_id(cls):
        return db.Column(UUID(as_uuid=True), db.ForeignKey('users.id'), index=True, nullable=False)

    @declared_attr
    def created_by(cls):
        return db.relationship('User')

    @declared_attr
    def process_type(cls):
        return db.Column(
            db.String(255),
            db.ForeignKey('template_process_type.name'),
            index=True,
            nullable=False,
            default=NORMAL
        )

    redact_personalisation = association_proxy('template_redacted', 'redact_personalisation')

    @declared_attr
    def service_letter_contact_id(cls):
        return db.Column(UUID(as_uuid=True), db.ForeignKey('service_letter_contacts.id'), nullable=True)

    @declared_attr
    def service_letter_contact(cls):
        return db.relationship('ServiceLetterContact', viewonly=True)

    @property
    def reply_to(self):
        if self.template_type == LETTER_TYPE:
            return self.service_letter_contact_id
        else:
            return None

    @reply_to.setter
    def reply_to(self, value):
        if self.template_type == LETTER_TYPE:
            self.service_letter_contact_id = value
        elif value is None:
            pass
        else:
            raise ValueError('Unable to set sender for {} template'.format(self.template_type))

    def get_reply_to_text(self):
        if self.template_type == LETTER_TYPE:
            return self.service_letter_contact.contact_block if self.service_letter_contact else None
        elif self.template_type == EMAIL_TYPE:
            return self.service.get_default_reply_to_email_address()
        elif self.template_type == SMS_TYPE:
            return try_validate_and_format_phone_number(self.service.get_default_sms_sender())
        else:
            return None

    def _as_utils_template(self):
        if self.template_type == EMAIL_TYPE:
            return PlainTextEmailTemplate(self.__dict__)
        if self.template_type == SMS_TYPE:
            return SMSMessageTemplate(self.__dict__)
        if self.template_type == LETTER_TYPE:
            return LetterPrintTemplate(
                self.__dict__,
                contact_block=self.get_reply_to_text(),
            )

    def _as_utils_template_with_personalisation(self, values):
        template = self._as_utils_template()
        template.values = values
        return template

    def serialize_for_v2(self):
        serialized = {
            "id": str(self.id),
            "type": self.template_type,
            "created_at": self.created_at.strftime(DATETIME_FORMAT),
            "updated_at": get_dt_string_or_none(self.updated_at),
            "created_by": self.created_by.email_address,
            "version": self.version,
            "body": self.content,
            "subject": self.subject if self.template_type in {EMAIL_TYPE, LETTER_TYPE} else None,
            "name": self.name,
            "personalisation": {
                key: {
                    'required': True,
                }
                for key in self._as_utils_template().placeholders
            },
            "letter_contact_block": self.service_letter_contact.contact_block if self.service_letter_contact else None,
        }

        return serialized


class Template(TemplateBase):
    __tablename__ = 'templates'

    service = db.relationship('Service', backref='templates')
    version = db.Column(db.Integer, default=0, nullable=False)

    folder = db.relationship(
        'TemplateFolder',
        secondary=template_folder_map,
        uselist=False,
        # eagerly load the folder whenever the template object is fetched
        lazy='joined',
        backref=db.backref('templates')
    )

    def get_link(self):
        # TODO: use "/v2/" route once available
        return url_for(
            "template.get_template_by_id_and_service_id",
            service_id=self.service_id,
            template_id=self.id,
            _external=True
        )

    @classmethod
    def from_json(cls, data, folder):
        """
        Assumption: data has been validated appropriately.
        Returns a Template object based on the provided data.
        """
        fields = data.copy()

        fields['created_by_id'] = fields.pop('created_by')
        fields['service_id'] = fields.pop('service')
        fields['folder'] = folder
        return cls(**fields)


class TemplateRedacted(db.Model):
    __tablename__ = 'template_redacted'

    template_id = db.Column(UUID(as_uuid=True), db.ForeignKey('templates.id'), primary_key=True, nullable=False)
    redact_personalisation = db.Column(db.Boolean, nullable=False, default=False)
    updated_at = db.Column(db.DateTime, nullable=False, default=datetime.datetime.utcnow)
    updated_by_id = db.Column(UUID(as_uuid=True), db.ForeignKey('users.id'), nullable=False, index=True)
    updated_by = db.relationship('User')

    # uselist=False as this is a one-to-one relationship
    template = db.relationship('Template', uselist=False, backref=db.backref('template_redacted', uselist=False))


class TemplateHistory(TemplateBase):
    __tablename__ = 'templates_history'

    service = db.relationship('Service')
    version = db.Column(db.Integer, primary_key=True, nullable=False)

    @declared_attr
    def template_redacted(cls):
        return db.relationship('TemplateRedacted', foreign_keys=[cls.id],
                               primaryjoin='TemplateRedacted.template_id == TemplateHistory.id')

    def get_link(self):
        return url_for(
            "v2_template.get_template_by_id",
            template_id=self.id,
            version=self.version,
            _external=True
        )


SNS_PROVIDER = 'sns'
SES_PROVIDER = 'ses'

SMS_PROVIDERS = [SNS_PROVIDER]
EMAIL_PROVIDERS = [SES_PROVIDER]
PROVIDERS = SMS_PROVIDERS + EMAIL_PROVIDERS

NOTIFICATION_TYPE = [EMAIL_TYPE, SMS_TYPE, LETTER_TYPE]
notification_types = db.Enum(*NOTIFICATION_TYPE, name='notification_type')


class ProviderDetails(db.Model):
    __tablename__ = 'provider_details'

    id = db.Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    display_name = db.Column(db.String, nullable=False)
    identifier = db.Column(db.String, nullable=False)
    priority = db.Column(db.Integer, nullable=False)
    notification_type = db.Column(notification_types, nullable=False)
    active = db.Column(db.Boolean, default=False, nullable=False)
    version = db.Column(db.Integer, default=1, nullable=False)
    updated_at = db.Column(db.DateTime, nullable=True, onupdate=datetime.datetime.utcnow)
    created_by_id = db.Column(UUID(as_uuid=True), db.ForeignKey('users.id'), index=True, nullable=True)
    created_by = db.relationship('User')
    supports_international = db.Column(db.Boolean, nullable=False, default=False)


class ProviderDetailsHistory(db.Model, HistoryModel):
    __tablename__ = 'provider_details_history'

    id = db.Column(UUID(as_uuid=True), primary_key=True, nullable=False)
    display_name = db.Column(db.String, nullable=False)
    identifier = db.Column(db.String, nullable=False)
    priority = db.Column(db.Integer, nullable=False)
    notification_type = db.Column(notification_types, nullable=False)
    active = db.Column(db.Boolean, nullable=False)
    version = db.Column(db.Integer, primary_key=True, nullable=False)
    updated_at = db.Column(db.DateTime, nullable=True, onupdate=datetime.datetime.utcnow)
    created_by_id = db.Column(UUID(as_uuid=True), db.ForeignKey('users.id'), index=True, nullable=True)
    created_by = db.relationship('User')
    supports_international = db.Column(db.Boolean, nullable=False, default=False)


JOB_STATUS_PENDING = 'pending'
JOB_STATUS_IN_PROGRESS = 'in progress'
JOB_STATUS_FINISHED = 'finished'
JOB_STATUS_SENDING_LIMITS_EXCEEDED = 'sending limits exceeded'
JOB_STATUS_SCHEDULED = 'scheduled'
JOB_STATUS_CANCELLED = 'cancelled'
JOB_STATUS_READY_TO_SEND = 'ready to send'
JOB_STATUS_SENT_TO_DVLA = 'sent to dvla'
JOB_STATUS_ERROR = 'error'
JOB_STATUS_TYPES = [
    JOB_STATUS_PENDING,
    JOB_STATUS_IN_PROGRESS,
    JOB_STATUS_FINISHED,
    JOB_STATUS_SENDING_LIMITS_EXCEEDED,
    JOB_STATUS_SCHEDULED,
    JOB_STATUS_CANCELLED,
    JOB_STATUS_READY_TO_SEND,
    JOB_STATUS_SENT_TO_DVLA,
    JOB_STATUS_ERROR
]


class JobStatus(db.Model):
    __tablename__ = 'job_status'

    name = db.Column(db.String(255), primary_key=True)


class Job(db.Model):
    __tablename__ = 'jobs'

    id = db.Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    original_file_name = db.Column(db.String, nullable=False)
    service_id = db.Column(UUID(as_uuid=True), db.ForeignKey('services.id'), index=True, unique=False, nullable=False)
    service = db.relationship('Service', backref=db.backref('jobs', lazy='dynamic'))
    template_id = db.Column(UUID(as_uuid=True), db.ForeignKey('templates.id'), index=True, unique=False)
    template = db.relationship('Template', backref=db.backref('jobs', lazy='dynamic'))
    template_version = db.Column(db.Integer, nullable=False)
    created_at = db.Column(
        db.DateTime,
        index=False,
        unique=False,
        nullable=False,
        default=datetime.datetime.utcnow)
    updated_at = db.Column(
        db.DateTime,
        index=False,
        unique=False,
        nullable=True,
        onupdate=datetime.datetime.utcnow)
    notification_count = db.Column(db.Integer, nullable=False)
    notifications_sent = db.Column(db.Integer, nullable=False, default=0)
    notifications_delivered = db.Column(db.Integer, nullable=False, default=0)
    notifications_failed = db.Column(db.Integer, nullable=False, default=0)

    processing_started = db.Column(
        db.DateTime,
        index=False,
        unique=False,
        nullable=True)
    processing_finished = db.Column(
        db.DateTime,
        index=False,
        unique=False,
        nullable=True)
    created_by = db.relationship('User')
    created_by_id = db.Column(UUID(as_uuid=True), db.ForeignKey('users.id'), index=True, nullable=True)
    scheduled_for = db.Column(
        db.DateTime,
        index=True,
        unique=False,
        nullable=True)
    job_status = db.Column(
        db.String(255), db.ForeignKey('job_status.name'), index=True, nullable=False, default='pending'
    )
    archived = db.Column(db.Boolean, nullable=False, default=False)
    contact_list_id = db.Column(UUID(as_uuid=True), db.ForeignKey('service_contact_list.id'), nullable=True)


VERIFY_CODE_TYPES = [EMAIL_TYPE, SMS_TYPE]


class VerifyCode(db.Model):
    __tablename__ = 'verify_codes'

    id = db.Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    user_id = db.Column(UUID(as_uuid=True), db.ForeignKey('users.id'), index=True, nullable=False)
    user = db.relationship('User', backref=db.backref('verify_codes', lazy='dynamic'))
    _code = db.Column(db.String, nullable=False)
    code_type = db.Column(db.Enum(*VERIFY_CODE_TYPES, name='verify_code_types'),
                          index=False, unique=False, nullable=False)
    expiry_datetime = db.Column(db.DateTime, nullable=False)
    code_used = db.Column(db.Boolean, default=False)
    created_at = db.Column(
        db.DateTime,
        index=False,
        unique=False,
        nullable=False,
        default=datetime.datetime.utcnow)

    @property
    def code(self):
        raise AttributeError("Code not readable")

    @code.setter
    def code(self, cde):
        self._code = hashpw(cde)

    def check_code(self, cde):
        return check_hash(cde, self._code)


NOTIFICATION_CANCELLED = 'cancelled'
NOTIFICATION_CREATED = 'created'
NOTIFICATION_SENDING = 'sending'
NOTIFICATION_SENT = 'sent'
NOTIFICATION_DELIVERED = 'delivered'
NOTIFICATION_PENDING = 'pending'
NOTIFICATION_FAILED = 'failed'
NOTIFICATION_TECHNICAL_FAILURE = 'technical-failure'
NOTIFICATION_TEMPORARY_FAILURE = 'temporary-failure'
NOTIFICATION_PERMANENT_FAILURE = 'permanent-failure'
NOTIFICATION_PENDING_VIRUS_CHECK = 'pending-virus-check'
NOTIFICATION_VALIDATION_FAILED = 'validation-failed'
NOTIFICATION_VIRUS_SCAN_FAILED = 'virus-scan-failed'
NOTIFICATION_RETURNED_LETTER = 'returned-letter'

NOTIFICATION_STATUS_TYPES_FAILED = [
    NOTIFICATION_TECHNICAL_FAILURE,
    NOTIFICATION_TEMPORARY_FAILURE,
    NOTIFICATION_PERMANENT_FAILURE,
    NOTIFICATION_VALIDATION_FAILED,
    NOTIFICATION_VIRUS_SCAN_FAILED,
    NOTIFICATION_RETURNED_LETTER,
]

NOTIFICATION_STATUS_TYPES_COMPLETED = [
    NOTIFICATION_SENT,
    NOTIFICATION_DELIVERED,
    NOTIFICATION_FAILED,
    NOTIFICATION_TECHNICAL_FAILURE,
    NOTIFICATION_TEMPORARY_FAILURE,
    NOTIFICATION_PERMANENT_FAILURE,
    NOTIFICATION_RETURNED_LETTER,
    NOTIFICATION_CANCELLED,
]

NOTIFICATION_STATUS_SUCCESS = [
    NOTIFICATION_SENT,
    NOTIFICATION_DELIVERED
]

NOTIFICATION_STATUS_TYPES_BILLABLE = [
    NOTIFICATION_SENDING,
    NOTIFICATION_SENT,
    NOTIFICATION_DELIVERED,
    NOTIFICATION_PENDING,
    NOTIFICATION_FAILED,
    NOTIFICATION_TEMPORARY_FAILURE,
    NOTIFICATION_PERMANENT_FAILURE,
    NOTIFICATION_RETURNED_LETTER,
]

NOTIFICATION_STATUS_TYPES_BILLABLE_SMS = [
    NOTIFICATION_SENDING,
    NOTIFICATION_SENT,  # internationally
    NOTIFICATION_DELIVERED,
    NOTIFICATION_PENDING,
    NOTIFICATION_TEMPORARY_FAILURE,
    NOTIFICATION_PERMANENT_FAILURE,
]

NOTIFICATION_STATUS_TYPES_BILLABLE_FOR_LETTERS = [
    NOTIFICATION_SENDING,
    NOTIFICATION_DELIVERED,
    NOTIFICATION_RETURNED_LETTER,
]
# we don't really have a concept of billable emails - however the ft billing table only includes emails that we have
# actually sent.
NOTIFICATION_STATUS_TYPES_SENT_EMAILS = [
    NOTIFICATION_SENDING,
    NOTIFICATION_DELIVERED,
    NOTIFICATION_TEMPORARY_FAILURE,
    NOTIFICATION_PERMANENT_FAILURE,
]

NOTIFICATION_STATUS_TYPES = [
    NOTIFICATION_CANCELLED,
    NOTIFICATION_CREATED,
    NOTIFICATION_SENDING,
    NOTIFICATION_SENT,
    NOTIFICATION_DELIVERED,
    NOTIFICATION_PENDING,
    NOTIFICATION_FAILED,
    NOTIFICATION_TECHNICAL_FAILURE,
    NOTIFICATION_TEMPORARY_FAILURE,
    NOTIFICATION_PERMANENT_FAILURE,
    NOTIFICATION_PENDING_VIRUS_CHECK,
    NOTIFICATION_VALIDATION_FAILED,
    NOTIFICATION_VIRUS_SCAN_FAILED,
    NOTIFICATION_RETURNED_LETTER,
]

NOTIFICATION_STATUS_TYPES_NON_BILLABLE = list(set(NOTIFICATION_STATUS_TYPES) - set(NOTIFICATION_STATUS_TYPES_BILLABLE))

NOTIFICATION_STATUS_TYPES_ENUM = db.Enum(*NOTIFICATION_STATUS_TYPES, name='notify_status_type')

NOTIFICATION_STATUS_LETTER_ACCEPTED = 'accepted'
NOTIFICATION_STATUS_LETTER_RECEIVED = 'received'


class NotificationStatusTypes(db.Model):
    __tablename__ = 'notification_status_types'

    name = db.Column(db.String(), primary_key=True)


class NotificationAllTimeView(db.Model):
    """
    WARNING: this view is a union of rows in "notifications" and
    "notification_history". Any query on this view will query both
    tables and therefore rely on *both* sets of indices.
    """
    __tablename__ = 'notifications_all_time_view'

    # Tell alembic not to create this as a table. We have a migration where we manually set this up as a view.
    # This is custom logic we apply - not built-in logic. See `migrations/env.py`
    __table_args__ = {"info": {"managed_by_alembic": False}}

    id = db.Column(UUID(as_uuid=True), primary_key=True)
    job_id = db.Column(UUID(as_uuid=True))
    job_row_number = db.Column(db.Integer)
    service_id = db.Column(UUID(as_uuid=True))
    template_id = db.Column(UUID(as_uuid=True))
    template_version = db.Column(db.Integer)
    api_key_id = db.Column(UUID(as_uuid=True))
    key_type = db.Column(db.String)
    billable_units = db.Column(db.Integer)
    notification_type = db.Column(notification_types)
    created_at = db.Column(db.DateTime)
    sent_at = db.Column(db.DateTime)
    sent_by = db.Column(db.String)
    updated_at = db.Column(db.DateTime)
    status = db.Column('notification_status', db.Text)
    reference = db.Column(db.String)
    client_reference = db.Column(db.String)
    international = db.Column(db.Boolean)
    phone_prefix = db.Column(db.String)
    rate_multiplier = db.Column(db.Numeric(asdecimal=False))
    created_by_id = db.Column(UUID(as_uuid=True))
    document_download_count = db.Column(db.Integer)


class Notification(db.Model):
    __tablename__ = 'notifications'

    id = db.Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    to = db.Column(db.String, nullable=False)
    normalised_to = db.Column(db.String, nullable=True)
    job_id = db.Column(UUID(as_uuid=True), db.ForeignKey('jobs.id'), index=True, unique=False)
    job = db.relationship('Job', backref=db.backref('notifications', lazy='dynamic'))
    job_row_number = db.Column(db.Integer, nullable=True)
    service_id = db.Column(UUID(as_uuid=True), db.ForeignKey('services.id'), unique=False)
    service = db.relationship('Service')
    template_id = db.Column(UUID(as_uuid=True), index=True, unique=False)
    template_version = db.Column(db.Integer, nullable=False)
    template = db.relationship('TemplateHistory')
    api_key_id = db.Column(UUID(as_uuid=True), db.ForeignKey('api_keys.id'), unique=False)
    api_key = db.relationship('ApiKey')
    key_type = db.Column(db.String, db.ForeignKey('key_types.name'), unique=False, nullable=False)
    billable_units = db.Column(db.Integer, nullable=False, default=0)
    notification_type = db.Column(notification_types, nullable=False)
    created_at = db.Column(
        db.DateTime,
        index=True,
        unique=False,
        nullable=False)
    sent_at = db.Column(
        db.DateTime,
        index=False,
        unique=False,
        nullable=True)
    sent_by = db.Column(db.String, nullable=True)
    updated_at = db.Column(
        db.DateTime,
        index=False,
        unique=False,
        nullable=True,
        onupdate=datetime.datetime.utcnow)
    status = db.Column(
        'notification_status',
        db.Text,
        db.ForeignKey('notification_status_types.name'),
        nullable=True,
        default='created',
        key='status'  # http://docs.sqlalchemy.org/en/latest/core/metadata.html#sqlalchemy.schema.Column
    )
    reference = db.Column(db.String, nullable=True, index=True)
    client_reference = db.Column(db.String, index=True, nullable=True)
    _personalisation = db.Column(db.String, nullable=True)

    international = db.Column(db.Boolean, nullable=False, default=False)
    phone_prefix = db.Column(db.String, nullable=True)
    rate_multiplier = db.Column(db.Numeric(asdecimal=False), nullable=True)

    created_by = db.relationship('User')
    created_by_id = db.Column(UUID(as_uuid=True), db.ForeignKey('users.id'), nullable=True)

    reply_to_text = db.Column(db.String, nullable=True)

    document_download_count = db.Column(db.Integer, nullable=True)

    provider_response = db.Column(db.Text, nullable=True)
    # queue_name = db.Column(db.Text, nullable=True)

    __table_args__ = (
        db.ForeignKeyConstraint(
            ['template_id', 'template_version'],
            ['templates_history.id', 'templates_history.version'],
        ),
        UniqueConstraint('job_id', 'job_row_number', name='uq_notifications_job_row_number'),
        Index(
            'ix_notifications_notification_type_composite',
            'notification_type',
            'status',
            'created_at'
        ),
        Index('ix_notifications_service_created_at', 'service_id', 'created_at'),
        Index(
            "ix_notifications_service_id_composite",
            'service_id',
            'notification_type',
            'status',
            'created_at'
        )
    )

    @property
    def personalisation(self):
        if self._personalisation:
            try:
                return encryption.decrypt(self._personalisation)
            except EncryptionError:
                current_app.logger.error("Error decrypting notification.personalisation, returning empty dict")
        return {}

    @personalisation.setter
    def personalisation(self, personalisation):
        self._personalisation = encryption.encrypt(personalisation or {})

    def completed_at(self):
        if self.status in NOTIFICATION_STATUS_TYPES_COMPLETED:
            return self.updated_at.strftime(DATETIME_FORMAT)

        return None

    @staticmethod
    def substitute_status(status_or_statuses):
        """
        static function that takes a status or list of statuses and substitutes our new failure types if it finds
        the deprecated one

        > IN
        'failed'

        < OUT
        ['technical-failure', 'temporary-failure', 'permanent-failure']

        -

        > IN
        ['failed', 'created', 'accepted']

        < OUT
        ['technical-failure', 'temporary-failure', 'permanent-failure', 'created', 'sending']


        -

        > IN
        'delivered'

        < OUT
        ['received']

        :param status_or_statuses: a single status or list of statuses
        :return: a single status or list with the current failure statuses substituted for 'failure'
        """

        def _substitute_status_str(_status):
            return (
                NOTIFICATION_STATUS_TYPES_FAILED if _status == NOTIFICATION_FAILED else
                [NOTIFICATION_CREATED, NOTIFICATION_SENDING] if _status == NOTIFICATION_STATUS_LETTER_ACCEPTED else
                NOTIFICATION_DELIVERED if _status == NOTIFICATION_STATUS_LETTER_RECEIVED else
                [_status]
            )

        def _substitute_status_seq(_statuses):
            return list(set(itertools.chain.from_iterable(_substitute_status_str(status) for status in _statuses)))

        if isinstance(status_or_statuses, str):
            return _substitute_status_str(status_or_statuses)
        return _substitute_status_seq(status_or_statuses)

    @property
    def content(self):
        return self.template._as_utils_template_with_personalisation(
            self.personalisation
        ).content_with_placeholders_filled_in

    @property
    def subject(self):
        template_object = self.template._as_utils_template_with_personalisation(
            self.personalisation
        )
        return getattr(template_object, 'subject', None)

    @property
    def formatted_status(self):
        return {
            'email': {
                'failed': 'Failed',
                'technical-failure': 'Technical failure',
                'temporary-failure': 'Inbox not accepting messages right now',
                'permanent-failure': 'Email address doesn’t exist',
                'delivered': 'Delivered',
                'sending': 'Sending',
                'created': 'Sending',
                'sent': 'Delivered'
            },
            'sms': {
                'failed': 'Failed',
                'technical-failure': 'Technical failure',
                'temporary-failure': 'Phone not accepting messages right now',
                'permanent-failure': 'Phone number doesn’t exist',
                'delivered': 'Delivered',
                'sending': 'Sending',
                'created': 'Sending',
                'sent': 'Sent internationally'
            },
            'letter': {
                'technical-failure': 'Technical failure',
                'permanent-failure': 'Permanent failure',
                'sending': 'Accepted',
                'created': 'Accepted',
                'delivered': 'Received',
                'returned-letter': 'Returned',
            }
        }[self.template.template_type].get(self.status, self.status)

    def get_letter_status(self):
        """
        Return the notification_status, as we should present for letters. The distinction between created and sending is
        a bit more confusing for letters, not to mention that there's no concept of temporary or permanent failure yet.


        """
        # this should only ever be called for letter notifications - it makes no sense otherwise and I'd rather not
        # get the two code flows mixed up at all
        assert self.notification_type == LETTER_TYPE  # nosec B101 - current calling code validates correct type

        if self.status in [NOTIFICATION_CREATED, NOTIFICATION_SENDING]:
            return NOTIFICATION_STATUS_LETTER_ACCEPTED
        elif self.status in [NOTIFICATION_DELIVERED, NOTIFICATION_RETURNED_LETTER]:
            return NOTIFICATION_STATUS_LETTER_RECEIVED
        else:
            # Currently can only be technical-failure OR pending-virus-check OR validation-failed
            return self.status

    def get_created_by_name(self):
        if self.created_by:
            return self.created_by.name
        else:
            return None

    def get_created_by_email_address(self):
        if self.created_by:
            return self.created_by.email_address
        else:
            return None

    def serialize_for_csv(self):
        created_at_in_est = convert_utc_to_local_timezone(self.created_at)
        serialized = {
            "row_number": '' if self.job_row_number is None else self.job_row_number + 1,
            "recipient": self.to,
            "client_reference": self.client_reference or '',
            "template_name": self.template.name,
            "template_type": self.template.template_type,
            "job_name": self.job.original_file_name if self.job else '',
            "status": self.formatted_status,
            "created_at": created_at_in_est.strftime("%Y-%m-%d %H:%M:%S"),
            "created_by_name": self.get_created_by_name(),
            "created_by_email_address": self.get_created_by_email_address(),
        }

        return serialized

    def serialize(self):
        template_dict = {
            'version': self.template.version,
            'id': self.template.id,
            'uri': self.template.get_link()
        }

        serialized = {
            "id": self.id,
            "reference": self.client_reference,
            "email_address": self.to if self.notification_type == EMAIL_TYPE else None,
            "phone_number": self.to if self.notification_type == SMS_TYPE else None,
            "line_1": None,
            "line_2": None,
            "line_3": None,
            "line_4": None,
            "line_5": None,
            "line_6": None,
            "postcode": None,
            "type": self.notification_type,
            "status": self.get_letter_status() if self.notification_type == LETTER_TYPE else self.status,
            "provider_response": self.provider_response,
            "template": template_dict,
            "body": self.content,
            "subject": self.subject,
            "created_at": self.created_at.strftime(DATETIME_FORMAT),
            "created_by_name": self.get_created_by_name(),
            "sent_at": get_dt_string_or_none(self.sent_at),
            "completed_at": self.completed_at(),
            "scheduled_for": None,
        }

        return serialized


class NotificationHistory(db.Model, HistoryModel):
    __tablename__ = 'notification_history'

    id = db.Column(UUID(as_uuid=True), primary_key=True)
    job_id = db.Column(UUID(as_uuid=True), db.ForeignKey('jobs.id'), index=True, unique=False)
    job = db.relationship('Job')
    job_row_number = db.Column(db.Integer, nullable=True)
    service_id = db.Column(UUID(as_uuid=True), db.ForeignKey('services.id'), unique=False)
    service = db.relationship('Service')
    template_id = db.Column(UUID(as_uuid=True), unique=False)
    template_version = db.Column(db.Integer, nullable=False)
    api_key_id = db.Column(UUID(as_uuid=True), db.ForeignKey('api_keys.id'), unique=False)
    api_key = db.relationship('ApiKey')
    key_type = db.Column(db.String, db.ForeignKey('key_types.name'), unique=False, nullable=False)
    billable_units = db.Column(db.Integer, nullable=False, default=0)
    notification_type = db.Column(notification_types, nullable=False)
    created_at = db.Column(db.DateTime, unique=False, nullable=False)
    sent_at = db.Column(db.DateTime, index=False, unique=False, nullable=True)
    sent_by = db.Column(db.String, nullable=True)
    updated_at = db.Column(db.DateTime, index=False, unique=False, nullable=True, onupdate=datetime.datetime.utcnow)
    status = db.Column(
        'notification_status',
        db.Text,
        db.ForeignKey('notification_status_types.name'),
        nullable=True,
        default='created',
        key='status'  # http://docs.sqlalchemy.org/en/latest/core/metadata.html#sqlalchemy.schema.Column
    )
    reference = db.Column(db.String, nullable=True, index=True)
    client_reference = db.Column(db.String, nullable=True)

    international = db.Column(db.Boolean, nullable=True, default=False)
    phone_prefix = db.Column(db.String, nullable=True)
    rate_multiplier = db.Column(db.Numeric(asdecimal=False), nullable=True)

    created_by_id = db.Column(UUID(as_uuid=True), nullable=True)

    document_download_count = db.Column(db.Integer, nullable=True)

    __table_args__ = (
        db.ForeignKeyConstraint(
            ['template_id', 'template_version'],
            ['templates_history.id', 'templates_history.version'],
        ),
        Index(
            'ix_notification_history_service_id_composite',
            'service_id',
            'key_type',
            'notification_type',
            'created_at'
        )
    )

    @classmethod
    def from_original(cls, notification):
        history = super().from_original(notification)
        history.status = notification.status
        return history

    def update_from_original(self, original):
        super().update_from_original(original)
        self.status = original.status


INVITE_PENDING = 'pending'
INVITE_ACCEPTED = 'accepted'
INVITE_CANCELLED = 'cancelled'
INVITED_USER_STATUS_TYPES = [INVITE_PENDING, INVITE_ACCEPTED, INVITE_CANCELLED]


class InviteStatusType(db.Model):
    __tablename__ = 'invite_status_type'

    name = db.Column(db.String, primary_key=True)


class InvitedUser(db.Model):
    __tablename__ = 'invited_users'

    id = db.Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    email_address = db.Column(db.String(255), nullable=False)
    user_id = db.Column(UUID(as_uuid=True), db.ForeignKey('users.id'), index=True, nullable=False)
    from_user = db.relationship('User')
    service_id = db.Column(UUID(as_uuid=True), db.ForeignKey('services.id'), index=True, unique=False)
    service = db.relationship('Service')
    created_at = db.Column(
        db.DateTime,
        index=False,
        unique=False,
        nullable=False,
        default=datetime.datetime.utcnow)
    status = db.Column(
        db.Enum(*INVITED_USER_STATUS_TYPES, name='invited_users_status_types'), nullable=False, default=INVITE_PENDING)
    permissions = db.Column(db.String, nullable=False)
    auth_type = db.Column(
        db.String,
        db.ForeignKey('auth_type.name'),
        index=True,
        nullable=False,
        default=EMAIL_AUTH_TYPE
    )
    folder_permissions = db.Column(JSONB(none_as_null=True), nullable=False, default=[])

    # would like to have used properties for this but haven't found a way to make them
    # play nice with marshmallow yet
    def get_permissions(self):
        return self.permissions.split(',')


class InvitedOrganisationUser(db.Model):
    __tablename__ = 'invited_organisation_users'

    id = db.Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    email_address = db.Column(db.String(255), nullable=False)
    invited_by_id = db.Column(UUID(as_uuid=True), db.ForeignKey('users.id'), nullable=False)
    invited_by = db.relationship('User')
    organisation_id = db.Column(UUID(as_uuid=True), db.ForeignKey('organisation.id'), nullable=False)
    organisation = db.relationship('Organisation')
    created_at = db.Column(db.DateTime, nullable=False, default=datetime.datetime.utcnow)

    status = db.Column(
        db.String,
        db.ForeignKey('invite_status_type.name'),
        nullable=False,
        default=INVITE_PENDING
    )

    def serialize(self):
        return {
            'id': str(self.id),
            'email_address': self.email_address,
            'invited_by': str(self.invited_by_id),
            'organisation': str(self.organisation_id),
            'created_at': self.created_at.strftime(DATETIME_FORMAT),
            'status': self.status
        }


# Service Permissions
MANAGE_USERS = 'manage_users'
MANAGE_TEMPLATES = 'manage_templates'
MANAGE_SETTINGS = 'manage_settings'
SEND_TEXTS = 'send_texts'
SEND_EMAILS = 'send_emails'
MANAGE_API_KEYS = 'manage_api_keys'
PLATFORM_ADMIN = 'platform_admin'
VIEW_ACTIVITY = 'view_activity'

# List of permissions
PERMISSION_LIST = [
    MANAGE_USERS,
    MANAGE_TEMPLATES,
    MANAGE_SETTINGS,
    SEND_TEXTS,
    SEND_EMAILS,
    MANAGE_API_KEYS,
    PLATFORM_ADMIN,
    VIEW_ACTIVITY,
]


class Permission(db.Model):
    __tablename__ = 'permissions'

    id = db.Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    # Service id is optional, if the service is omitted we will assume the permission is not service specific.
    service_id = db.Column(UUID(as_uuid=True), db.ForeignKey('services.id'), index=True, unique=False, nullable=True)
    service = db.relationship('Service')
    user_id = db.Column(UUID(as_uuid=True), db.ForeignKey('users.id'), index=True, nullable=False)
    user = db.relationship('User')
    permission = db.Column(
        db.Enum(*PERMISSION_LIST, name='permission_types'),
        index=False,
        unique=False,
        nullable=False)
    created_at = db.Column(
        db.DateTime,
        index=False,
        unique=False,
        nullable=False,
        default=datetime.datetime.utcnow)

    __table_args__ = (
        UniqueConstraint('service_id', 'user_id', 'permission', name='uix_service_user_permission'),
    )


class Event(db.Model):
    __tablename__ = 'events'

    id = db.Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    event_type = db.Column(db.String(255), nullable=False)
    created_at = db.Column(
        db.DateTime,
        index=False,
        unique=False,
        nullable=False,
        default=datetime.datetime.utcnow)
    data = db.Column(JSON, nullable=False)


class Rate(db.Model):
    __tablename__ = 'rates'

    id = db.Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    valid_from = db.Column(db.DateTime, nullable=False)
    rate = db.Column(db.Float(asdecimal=False), nullable=False)
    notification_type = db.Column(notification_types, index=True, nullable=False)

    def __str__(self):
        the_string = "{}".format(self.rate)
        the_string += " {}".format(self.notification_type)
        the_string += " {}".format(self.valid_from)
        return the_string


class InboundSms(db.Model):
    __tablename__ = 'inbound_sms'

    id = db.Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    created_at = db.Column(db.DateTime, nullable=False, default=datetime.datetime.utcnow)
    service_id = db.Column(UUID(as_uuid=True), db.ForeignKey('services.id'), index=True, nullable=False)
    service = db.relationship('Service', backref='inbound_sms')

    notify_number = db.Column(db.String, nullable=False)  # the service's number, that the msg was sent to
    user_number = db.Column(db.String, nullable=False, index=True)  # the end user's number, that the msg was sent from
    provider_date = db.Column(db.DateTime)
    provider_reference = db.Column(db.String)
    provider = db.Column(db.String, nullable=False)
    _content = db.Column('content', db.String, nullable=False)

    @property
    def content(self):
        return encryption.decrypt(self._content)

    @content.setter
    def content(self, content):
        self._content = encryption.encrypt(content)

    def serialize(self):
        return {
            'id': str(self.id),
            'created_at': self.created_at.strftime(DATETIME_FORMAT),
            'service_id': str(self.service_id),
            'notify_number': self.notify_number,
            'user_number': self.user_number,
            'content': self.content,
        }


class InboundSmsHistory(db.Model, HistoryModel):
    __tablename__ = 'inbound_sms_history'
    id = db.Column(UUID(as_uuid=True), primary_key=True)
    created_at = db.Column(db.DateTime, index=True, unique=False, nullable=False)
    service_id = db.Column(UUID(as_uuid=True), db.ForeignKey('services.id'), index=True, unique=False)
    service = db.relationship('Service')
    notify_number = db.Column(db.String, nullable=False)
    provider_date = db.Column(db.DateTime)
    provider_reference = db.Column(db.String)
    provider = db.Column(db.String, nullable=False)


class ServiceEmailReplyTo(db.Model):
    __tablename__ = "service_email_reply_to"

    id = db.Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)

    service_id = db.Column(UUID(as_uuid=True), db.ForeignKey('services.id'), unique=False, index=True, nullable=False)
    service = db.relationship(Service, backref=db.backref("reply_to_email_addresses"))

    email_address = db.Column(db.Text, nullable=False, index=False, unique=False)
    is_default = db.Column(db.Boolean, nullable=False, default=True)
    archived = db.Column(db.Boolean, nullable=False, default=False)
    created_at = db.Column(db.DateTime, nullable=False, default=datetime.datetime.utcnow)
    updated_at = db.Column(db.DateTime, nullable=True, onupdate=datetime.datetime.utcnow)

    def serialize(self):
        return {
            'id': str(self.id),
            'service_id': str(self.service_id),
            'email_address': self.email_address,
            'is_default': self.is_default,
            'archived': self.archived,
            'created_at': self.created_at.strftime(DATETIME_FORMAT),
            'updated_at': get_dt_string_or_none(self.updated_at),
        }


class ServiceLetterContact(db.Model):
    __tablename__ = "service_letter_contacts"

    id = db.Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)

    service_id = db.Column(UUID(as_uuid=True), db.ForeignKey('services.id'), unique=False, index=True, nullable=False)
    service = db.relationship(Service, backref=db.backref("letter_contacts"))

    contact_block = db.Column(db.Text, nullable=False, index=False, unique=False)
    is_default = db.Column(db.Boolean, nullable=False, default=True)
    archived = db.Column(db.Boolean, nullable=False, default=False)
    created_at = db.Column(db.DateTime, nullable=False, default=datetime.datetime.utcnow)
    updated_at = db.Column(db.DateTime, nullable=True, onupdate=datetime.datetime.utcnow)

    def serialize(self):
        return {
            'id': str(self.id),
            'service_id': str(self.service_id),
            'contact_block': self.contact_block,
            'is_default': self.is_default,
            'archived': self.archived,
            'created_at': self.created_at.strftime(DATETIME_FORMAT),
            'updated_at': get_dt_string_or_none(self.updated_at),
        }


class AuthType(db.Model):
    __tablename__ = 'auth_type'

    name = db.Column(db.String, primary_key=True)


class DailySortedLetter(db.Model):
    __tablename__ = "daily_sorted_letter"

    id = db.Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    billing_day = db.Column(db.Date, nullable=False, index=True)
    file_name = db.Column(db.String, nullable=True, index=True)
    unsorted_count = db.Column(db.Integer, nullable=False, default=0)
    sorted_count = db.Column(db.Integer, nullable=False, default=0)
    updated_at = db.Column(db.DateTime, nullable=True, onupdate=datetime.datetime.utcnow)

    __table_args__ = (UniqueConstraint('file_name', 'billing_day', name='uix_file_name_billing_day'),
                      )


class FactBilling(db.Model):
    __tablename__ = "ft_billing"

    local_date = db.Column(db.Date, nullable=False, primary_key=True, index=True)
    template_id = db.Column(UUID(as_uuid=True), nullable=False, primary_key=True, index=True)
    service_id = db.Column(UUID(as_uuid=True), nullable=False, primary_key=True, index=True)
    notification_type = db.Column(db.Text, nullable=False, primary_key=True)
    provider = db.Column(db.Text, nullable=False, primary_key=True)
    rate_multiplier = db.Column(db.Integer(), nullable=False, primary_key=True)
    international = db.Column(db.Boolean, nullable=False, primary_key=True)
    rate = db.Column(db.Numeric(), nullable=False, primary_key=True)
    billable_units = db.Column(db.Integer(), nullable=True)
    notifications_sent = db.Column(db.Integer(), nullable=True)
    created_at = db.Column(db.DateTime, nullable=False, default=datetime.datetime.utcnow)
    updated_at = db.Column(db.DateTime, nullable=True, onupdate=datetime.datetime.utcnow)


class FactNotificationStatus(db.Model):
    __tablename__ = "ft_notification_status"

    local_date = db.Column(db.Date, index=True, primary_key=True, nullable=False)
    template_id = db.Column(UUID(as_uuid=True), primary_key=True, index=True, nullable=False)
    service_id = db.Column(UUID(as_uuid=True), primary_key=True, index=True, nullable=False, )
    job_id = db.Column(UUID(as_uuid=True), primary_key=True, index=True, nullable=False)
    notification_type = db.Column(db.Text, primary_key=True, nullable=False)
    key_type = db.Column(db.Text, primary_key=True, nullable=False)
    notification_status = db.Column(db.Text, primary_key=True, nullable=False)
    notification_count = db.Column(db.Integer(), nullable=False)
    created_at = db.Column(db.DateTime, nullable=False, default=datetime.datetime.utcnow)
    updated_at = db.Column(db.DateTime, nullable=True, onupdate=datetime.datetime.utcnow)


class FactProcessingTime(db.Model):
    __tablename__ = "ft_processing_time"

    local_date = db.Column(db.Date, index=True, primary_key=True, nullable=False)
    messages_total = db.Column(db.Integer(), nullable=False)
    messages_within_10_secs = db.Column(db.Integer(), nullable=False)
    created_at = db.Column(db.DateTime, nullable=False, default=datetime.datetime.utcnow)
    updated_at = db.Column(db.DateTime, nullable=True, onupdate=datetime.datetime.utcnow)


class Complaint(db.Model):
    __tablename__ = 'complaints'

    id = db.Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    notification_id = db.Column(UUID(as_uuid=True), index=True, nullable=False)
    service_id = db.Column(UUID(as_uuid=True), db.ForeignKey('services.id'), unique=False, index=True, nullable=False)
    service = db.relationship(Service, backref=db.backref('complaints'))
    ses_feedback_id = db.Column(db.Text, nullable=True)
    complaint_type = db.Column(db.Text, nullable=True)
    complaint_date = db.Column(db.DateTime, nullable=True)
    created_at = db.Column(db.DateTime, nullable=False, default=datetime.datetime.utcnow)

    def serialize(self):
        return {
            'id': str(self.id),
            'notification_id': str(self.notification_id),
            'service_id': str(self.service_id),
            'service_name': self.service.name,
            'ses_feedback_id': str(self.ses_feedback_id),
            'complaint_type': self.complaint_type,
            'complaint_date': get_dt_string_or_none(self.complaint_date),
            'created_at': self.created_at.strftime(DATETIME_FORMAT),
        }


class ServiceDataRetention(db.Model):
    __tablename__ = 'service_data_retention'

    id = db.Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    service_id = db.Column(UUID(as_uuid=True), db.ForeignKey('services.id'), unique=False, index=True, nullable=False)
    service = db.relationship(
        Service,
        backref=db.backref(
            'data_retention',
            collection_class=attribute_mapped_collection('notification_type')
        )
    )
    notification_type = db.Column(notification_types, nullable=False)
    days_of_retention = db.Column(db.Integer, nullable=False)
    created_at = db.Column(db.DateTime, nullable=False, default=datetime.datetime.utcnow)
    updated_at = db.Column(db.DateTime, nullable=True, onupdate=datetime.datetime.utcnow)

    __table_args__ = (
        UniqueConstraint('service_id', 'notification_type', name='uix_service_data_retention'),
    )

    def serialize(self):
        return {
            "id": str(self.id),
            "service_id": str(self.service_id),
            "service_name": self.service.name,
            "notification_type": self.notification_type,
            "days_of_retention": self.days_of_retention,
            "created_at": self.created_at.strftime(DATETIME_FORMAT),
            "updated_at": get_dt_string_or_none(self.updated_at),
        }


class ReturnedLetter(db.Model):
    __tablename__ = 'returned_letters'

    id = db.Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    reported_at = db.Column(db.Date, nullable=False)
    service_id = db.Column(UUID(as_uuid=True), db.ForeignKey('services.id'), unique=False, index=True, nullable=False)
    service = db.relationship(Service, backref=db.backref('returned_letters'))
    notification_id = db.Column(UUID(as_uuid=True), unique=True, nullable=False)
    created_at = db.Column(db.DateTime, nullable=False)
    updated_at = db.Column(db.DateTime, nullable=True, onupdate=datetime.datetime.utcnow)


class ServiceContactList(db.Model):
    __tablename__ = 'service_contact_list'

    id = db.Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    original_file_name = db.Column(db.String, nullable=False)
    row_count = db.Column(db.Integer, nullable=False)
    template_type = db.Column(template_types, nullable=False)
    service_id = db.Column(UUID(as_uuid=True), db.ForeignKey('services.id'), unique=False, index=True, nullable=False)
    service = db.relationship(Service, backref=db.backref('contact_list'))
    created_by = db.relationship('User')
    created_by_id = db.Column(UUID(as_uuid=True), db.ForeignKey('users.id'), index=True, nullable=True)
    created_at = db.Column(db.DateTime, nullable=False)
    updated_at = db.Column(db.DateTime, nullable=True, onupdate=datetime.datetime.utcnow)
    archived = db.Column(db.Boolean, nullable=False, default=False)

    @property
    def job_count(self):
        today = datetime.datetime.utcnow().date()
        return Job.query.filter(
            Job.contact_list_id == self.id,
            func.coalesce(
                Job.processing_started, Job.created_at
            ) >= today - func.coalesce(ServiceDataRetention.days_of_retention, 7)
        ).outerjoin(
            ServiceDataRetention, and_(
                self.service_id == ServiceDataRetention.service_id,
                func.cast(self.template_type, String) == func.cast(ServiceDataRetention.notification_type, String)
            )
        ).count()

    @property
    def has_jobs(self):
        return bool(Job.query.filter(
            Job.contact_list_id == self.id,
        ).first())

    def serialize(self):
        contact_list = {
            "id": str(self.id),
            "original_file_name": self.original_file_name,
            "row_count": self.row_count,
            "recent_job_count": self.job_count,
            "has_jobs": self.has_jobs,
            "template_type": self.template_type,
            "service_id": str(self.service_id),
            "created_by": self.created_by.name,
            "created_at": self.created_at.strftime(DATETIME_FORMAT),
        }
        return contact_list


class WebauthnCredential(db.Model):
    """
    A table that stores data for registered webauthn credentials.
    """
    __tablename__ = "webauthn_credential"

    id = db.Column(UUID(as_uuid=True), primary_key=True, nullable=False, default=uuid.uuid4)

    user_id = db.Column(UUID(as_uuid=True), db.ForeignKey('users.id'), nullable=False)
    user = db.relationship(User, backref=db.backref("webauthn_credentials"))

    name = db.Column(db.String, nullable=False)

    # base64 encoded CBOR. used for logging in. https://w3c.github.io/webauthn/#sctn-attested-credential-data
    credential_data = db.Column(db.String, nullable=False)

    # base64 encoded CBOR. used for auditing. https://www.w3.org/TR/webauthn-2/#authenticatorattestationresponse
    registration_response = db.Column(db.String, nullable=False)

    created_at = db.Column(db.DateTime, nullable=False, default=datetime.datetime.utcnow)
    updated_at = db.Column(db.DateTime, nullable=True, onupdate=datetime.datetime.utcnow)

    def serialize(self):
        return {
            'id': str(self.id),
            'user_id': str(self.user_id),
            'name': self.name,
            'credential_data': self.credential_data,
            'created_at': self.created_at.strftime(DATETIME_FORMAT),
            'updated_at': get_dt_string_or_none(self.updated_at),
        }