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

from trytond.model import fields
from trytond.exceptions import UserError
from trytond.pool import PoolMeta
from trytond.pyson import Eval, Or, Len
from trytond.modules.cashbook.book import STATES2, DEPENDS2


class Book(metaclass=PoolMeta):
    __name__ = 'cashbook.book'

    asset = fields.Many2One(string='Asset',
        model_name='investment.asset', ondelete='RESTRICT',
        states={
            'required': Eval('feature', '') == 'asset',
            'invisible': Eval('feature', '') != 'asset',
            'readonly': Or(
                    STATES2['readonly'],
                    Len(Eval('lines')) > 0,
                ),
        }, depends=DEPENDS2+['feature', 'lines'])
    quantity_digits = fields.Integer(string='Digits',
        help='Quantity Digits',
        domain=[
                ('quantity_digits', '>=', 0),
                ('quantity_digits', '<=', 6),
            ],
        states={
            'required': Eval('feature', '') == 'asset',
            'invisible': Eval('feature', '') != 'asset',
            'readonly': Or(
                    STATES2['readonly'],
                    Len(Eval('lines')) > 0,
                ),
        }, depends=DEPENDS2+['feature', 'lines'])
    asset_uomcat = fields.Function(fields.Many2One(string='UOM Category',
        readonly=True, model_name='product.uom.category',
        states={'invisible': True}), 'on_change_with_asset_uomcat')
    quantity_uom = fields.Many2One(string='UOM',
        model_name='product.uom', ondelete='RESTRICT',
        domain=[
            ('category.id', '=', Eval('asset_uomcat', -1)),
        ],
        states={
            'required': Eval('feature', '') == 'asset',
            'invisible': Eval('feature', '') != 'asset',
            'readonly': Or(
                    STATES2['readonly'],
                    Len(Eval('lines')) > 0,
                ),
        }, depends=DEPENDS2+['feature', 'lines', 'asset_uomcat'])

    @fields.depends('asset', 'quantity_uom')
    def on_change_asset(self):
        """ get uom from asset
        """
        if self.asset:
            self.quantity_uom = self.asset.uom.id

    @classmethod
    def default_quantity_digits(cls):
        """ default: 4
        """
        return 4

    @fields.depends('asset', '_parent_asset.uom')
    def on_change_with_asset_uomcat(self, name=None):
        """ get uom-category of asset
        """
        if self.asset:
            return self.asset.uom.category.id

# end Book