# -*- coding: utf-8 -*-
# This file is part of the cashbook-module from m-ds.de for Tryton.
# The COPYRIGHT file at the top level of this repository contains the
# full copyright notices and license terms.


from trytond.pool import PoolMeta, Pool
from trytond.model import fields
from trytond.pyson import Eval, Or
from .mixin import SecondUomMixin


STATES = {
    'readonly': Or(
            Eval('state', '') != 'edit',
            Eval('state_cashbook', '') != 'open',
        ),
    'required': Eval('feature', '') == 'asset',
    'invisible': Eval('feature', '') != 'asset',
    }
DEPENDS=['state', 'state_cashbook', 'feature']


class SplitLine(SecondUomMixin, metaclass=PoolMeta):
    __name__ = 'cashbook.split'

    quantity = fields.Numeric(string='Quantity',
        digits=(16, Eval('quantity_digits', 4)),
        states=STATES, depends=DEPENDS+['quantity_digits'])
    quantity_digits = fields.Function(fields.Integer(string='Digits',
        readonly=True, states={'invisible': True}),
        'on_change_with_quantity_digits')
    quantity_uom = fields.Function(fields.Many2One(string='Symbol',
        readonly=True, model_name='product.uom'),
        'on_change_with_quantity_uom')

    @fields.depends('line', '_parent_line.cashbook')
    def on_change_with_quantity_uom(self, name=None):
        """ get quantity-unit of asset
        """
        if self.line:
            if self.line.cashbook.quantity_uom:
                return self.cashbook.quantity_uom.id

    @fields.depends('line', '_parent_line.cashbook')
    def on_change_with_quantity_digits(self, name=None):
        """ get digits from cashbook
        """
        if self.line:
            return self.line.cashbook.quantity_digits
        return 4

    @classmethod
    def add_2nd_unit_values(cls, values):
        """ extend create-values
        """
        Line2 = Pool().get('cashbook.line')

        values = super(SplitLine, cls).add_2nd_unit_values(values)
        line = Line2(values.get('line', None))

        if line:
            values.update(cls.add_2nd_quantity(values, line.cashbook.quantity_uom))
        return values

# end SplitLine