# -*- 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 decimal import Decimal
from trytond.model import fields
from trytond.pool import PoolMeta
from trytond.pyson import Eval, Or, If
from trytond.modules.cashbook.line import STATES, DEPENDS

STATESQ = {
    'required': Or(
            Eval('feature', '') == 'asset',
            Eval('booktransf_feature', '') == 'asset',
        ),
    'invisible': ~Or(
            Eval('feature', '') == 'asset',
            Eval('booktransf_feature', '') == 'asset',
        ),
    'readonly': Or(
        STATES['readonly'],
        Eval('bookingtype', '').in_(['spin', 'spout']),
        ),
    }
DEPENDSQ = DEPENDS+['feature', 'booktransf_feature',
    'quantity_digits', 'bookingtype']


class Line(metaclass=PoolMeta):
    __name__ = 'cashbook.line'

    quantity = fields.Numeric(string='Quantity',
        digits=(16, Eval('quantity_digits', 4)),
        states=STATESQ, depends=DEPENDSQ)
    quantity_credit = fields.Numeric(string='Quantity Credit',
        digits=(16, Eval('quantity_digits', 4)),
        states=STATESQ, depends=DEPENDSQ)
    quantity_debit = fields.Numeric(string='Quantity Debit',
        digits=(16, Eval('quantity_digits', 4)),
        states=STATESQ, depends=DEPENDSQ)

    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')
    asset_rate = fields.Function(fields.Numeric(string='Rate',
        readonly=True,
        digits=(16, If(
            Eval('currency_digits', 2) > Eval('quantity_digits', 2),
            Eval('currency_digits', 2), Eval('quantity_digits', 2))),
        states={
            'invisible': Eval('feature', '') != 'asset',
        }, depends=['currency_digits', 'quantity_digits', 'feature']),
        'on_change_with_asset_rate')

    @classmethod
    def get_debit_credit(cls, values):
        """ compute quantity_debit/quantity_credit from quantity
        """
        values2 = super(Line, cls).get_debit_credit(values)

        if isinstance(values, dict):
            type_ = values.get('bookingtype', None)
            quantity = values.get('quantity', None)
        else :
            type_ = getattr(values, 'bookingtype', None)
            quantity = getattr(values, 'quantity', None)

        if type_:
            if quantity is not None:
                if type_ in ['in', 'mvin', 'spin']:
                    values2.update({
                        'quantity_debit': Decimal('0.0'),
                        'quantity_credit': quantity,
                        })
                elif type_ in ['out', 'mvout', 'spout']:
                    values2.update({
                        'quantity_debit': quantity,
                        'quantity_credit': Decimal('0.0'),
                        })
                else :
                    raise ValueError('invalid "bookingtype"')
        return values2

    @classmethod
    def get_counterpart_values(cls, line, values={}):
        """ add quantity to counterpart
        """
        result = super(Line, cls).get_counterpart_values(line, values)
        result['quantity'] = line.quantity
        return result

    @fields.depends('quantity', 'amount', 'currency_digits', 'quantity_digits')
    def on_change_with_asset_rate(self, name=None):
        """ get rate
        """
        if (self.quantity is None) or (self.amount is None):
            return
        digit = max(
            self.currency_digits if self.currency_digits is not None else 2,
            self.quantity_digits if self.quantity_digits is not None else 4)
        if self.quantity != Decimal('0.0'):
            return (
                    self.amount / self.quantity
                ).quantize(Decimal(str(1/10**digit)))

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

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

# end LineContext