# -*- coding: utf-8; -*-
################################################################################
#
#  Rattail -- Retail Software Framework
#  Copyright © 2010-2022 Lance Edgar
#
#  This file is part of Rattail.
#
#  Rattail is free software: you can redistribute it and/or modify it under the
#  terms of the GNU General Public License as published by the Free Software
#  Foundation, either version 3 of the License, or (at your option) any later
#  version.
#
#  Rattail is distributed in the hope that it will be useful, but WITHOUT ANY
#  WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
#  FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
#  details.
#
#  You should have received a copy of the GNU General Public License along with
#  Rattail.  If not, see <http://www.gnu.org/licenses/>.
#
################################################################################
"""
Clientele Handler
"""

from __future__ import unicode_literals, absolute_import

from rattail.util import load_object
from rattail.app import GenericHandler


class ClienteleHandler(GenericHandler):
    """
    Base class and default implementation for clientele handlers.
    """

    def choice_uses_dropdown(self):
        """
        Returns boolean indicating whether a customer choice should be
        presented to the user via a dropdown (select) element, vs.  an
        autocomplete field.  The latter is the default because
        potentially the customer list can be quite large, so we avoid
        loading them all in the dropdown unless so configured.

        :returns: Boolean; if true then a dropdown should be used;
           otherwise (false) autocomplete is used.
        """
        return self.config.getbool('rattail', 'customers.choice_uses_dropdown',
                                   default=False)

    def ensure_customer(self, person):
        """
        Returns the customer record associated with the given person, creating
        it first if necessary.
        """
        customer = self.get_customer(person)
        if customer:
            return customer

        session = self.get_session(person)
        customer = self.make_customer(person)
        session.add(customer)
        session.flush()
        session.refresh(person)
        return customer

    def get_customer(self, person):
        """
        Returns the customer associated with the given person, if there is one.
        """
        return person.only_customer(require=False)

    def get_person(self, customer):
        """
        Returns the person associated with the given customer, if there is one.
        """
        return customer.only_person(require=False)

    def make_customer(self, person, **kwargs):
        """
        Create and return a new customer record.
        """
        customer = self.model.Customer()
        customer.name = person.display_name
        customer.people.append(person)
        return customer

    def get_first_phone(self, customer, **kwargs):
        """
        Return the first available phone record found, either for the
        customer, or its first person.
        """
        phone = customer.first_phone()
        if phone:
            return phone

        person = self.get_person(customer)
        if person:
            return person.first_phone()

    def get_first_phone_number(self, customer, **kwargs):
        """
        Return the first available phone number found, either for the
        customer, or its first person.
        """
        phone = self.get_first_phone(customer)
        if phone:
            return phone.number

    def get_first_email(self, customer, invalid=False, **kwargs):
        """
        Return the first available email record found, either for the
        customer, or its first person.
        """
        email = customer.first_email(invalid=invalid)
        if email:
            return email

        person = self.get_person(customer)
        if person:
            return person.first_email(invalid=invalid)

    def get_first_email_address(self, customer, invalid=False, **kwargs):
        """
        Return the first available email address found, either for the
        customer, or its first person.
        """
        email = self.get_first_email(customer, invalid=invalid)
        if email:
            return email.address


def get_clientele_handler(config, **kwargs):
    """
    Create and return the configured :class:`ClienteleHandler` instance.
    """
    spec = config.get('rattail', 'clientele.handler')
    if spec:
        factory = load_object(spec)
    else:
        factory = ClienteleHandler
    return factory(config, **kwargs)
