# The COPYRIGHT file at the top level of
# this repository contains the full copyright notices and license terms.
from trytond.model import ModelSQL, fields
from trytond.pool import PoolMeta, Pool
from trytond.modules.company.model import CompanyValueMixin
from trytond import backend
from trytond.tools.multivalue import migrate_property

__all__ = ['Party', 'PartyParty']
parties_names = ['customer_to_invoice', 'supplier_to_invoice']


class Party:
    __name__ = 'party.party'
    __metaclass__ = PoolMeta

    customer_to_invoice = fields.MultiValue(
            fields.Many2One('party.party', 'Customer to invoice'))
    supplier_to_invoice = fields.MultiValue(
            fields.Many2One('party.party', 'Supplier to invoice'))

    @classmethod
    def multivalue_model(cls, field):
        pool = Pool()
        if field in parties_names:
            return pool.get('party.party.party')
        return super(Party, cls).multivalue_model(field)


class PartyParty(ModelSQL, CompanyValueMixin):
    "Party Party"
    __name__ = 'party.party.party'
    customer_to_invoice = fields.Many2One('party.party', 'Customer to invoice')
    supplier_to_invoice = fields.Many2One('party.party', 'Supplier to invoice')

    @classmethod
    def __register__(cls, module_name):
        TableHandler = backend.get('TableHandler')
        exist = TableHandler.table_exist(cls._table)

        super(PartyParty, cls).__register__(module_name)

        if not exist:
            cls._migrate_property([], [], [])

    @classmethod
    def _migrate_property(cls, field_names, value_names, fields):
        field_names.extend(parties_names)
        value_names.extend(parties_names)
        fields.append('company')
        migrate_property('party.party',
            field_names, cls, value_names, fields=fields)