# -*- 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 ModelView, ModelSQL, Workflow, fields, Check
from trytond.pool import Pool
from trytond.pyson import Eval, If
from trytond.report import Report
from trytond.i18n import gettext
from trytond.transaction import Transaction
from .line import sel_linetype, sel_bookingtype, STATES, DEPENDS
from .book import sel_state_book


class SplitLine(ModelSQL, ModelView):
    'Split booking line'
    __name__ = 'cashbook.split'

    line = fields.Many2One(string='Line', required=True,
        select=True, ondelete='CASCADE', model_name='cashbook.line',
        readonly=True)
    description = fields.Text(string='Description',
        states=STATES, depends=DEPENDS)
    category = fields.Many2One(string='Category',
        model_name='cashbook.category', ondelete='RESTRICT',
        states=STATES, depends=DEPENDS+['bookingtype'], required=True,
        domain=[
            If(
                Eval('bookingtype', '') == 'spin',
                ('cattype', '=', 'in'),
                ('cattype', '=', 'out'),
            )])
    category_view = fields.Function(fields.Char(string='Category', readonly=True),
        'on_change_with_category_view')
    amount = fields.Numeric(string='Amount', digits=(16, Eval('currency_digits', 2)),
        required=True, states=STATES, depends=DEPENDS+['currency_digits'])

    currency = fields.Function(fields.Many2One(model_name='currency.currency',
        string="Currency", readonly=True), 'on_change_with_currency')
    currency_digits = fields.Function(fields.Integer(string='Currency Digits',
        readonly=True), 'on_change_with_currency_digits')
    bookingtype = fields.Function(fields.Selection(string='Type', readonly=True,
        selection=sel_bookingtype), 'on_change_with_bookingtype')
    state = fields.Function(fields.Selection(string='State', readonly=True,
        selection=sel_linetype), 'on_change_with_state')
    state_cashbook = fields.Function(fields.Selection(string='State of Cashbook',
        readonly=True, states={'invisible': True}, selection=sel_state_book),
        'on_change_with_state_cashbook')

    def get_rec_name(self, name):
        """ short + name
        """
        return '%(type)s|%(amount)s %(symbol)s|%(desc)s [%(category)s]' % {
            'desc': (self.description or '-')[:40],
            'amount': Report.format_number(self.amount, None),
            'symbol': getattr(self.currency, 'symbol', '-'),
            'category': self.category_view,
            'type': gettext('cashbook.msg_line_bookingtype_%s' % self.line.bookingtype),
            }

    def get_amount_by_second_currency(self, to_currency):
        """ get amount, calculate credit/debit from currency of current
            cashbook to 'to_currency'
        """
        Currency = Pool().get('currency.currency')

        values = {
            'amount': self.amount,
            }

        if to_currency.id != self.line.cashbook.currency.id:
            with Transaction().set_context({
                'date': self.line.date,
                }):
                values['amount'] = Currency.compute(
                        self.line.cashbook.currency,
                        self.amount,
                        to_currency)
        return values

    @fields.depends('category')
    def on_change_with_category_view(self, name=None):
        """ show optimizef form of category for list-view
        """
        Configuration = Pool().get('cashbook.configuration')

        if self.category:
            cfg1 = Configuration.get_singleton()

            if getattr(cfg1, 'catnamelong', True) == True:
                return self.category.rec_name
            else :
                return self.category.name

    @fields.depends('line', '_parent_line.state')
    def on_change_with_state(self, name=None):
        """ get state
        """
        if self.line:
            return self.line.state

    @fields.depends('line', '_parent_line.cashbook')
    def on_change_with_state_cashbook(self, name=None):
        """ get state of cashbook
        """
        if self.line:
            return self.line.cashbook.state

    @fields.depends('line', '_parent_line.bookingtype')
    def on_change_with_bookingtype(self, name=None):
        """ get type
        """
        if self.line:
            return self.line.bookingtype

    @fields.depends('line', '_parent_line.cashbook')
    def on_change_with_currency(self, name=None):
        """ currency of cashbook
        """
        if self.line:
            return self.line.cashbook.currency.id

    @fields.depends('line', '_parent_line.cashbook')
    def on_change_with_currency_digits(self, name=None):
        """ currency-digits of cashbook
        """
        if self.line:
            return self.line.cashbook.currency.digits
        else:
            return 2

    @classmethod
    def create(cls, vlist):
        """ add debit/credit
        """
        Line2 = Pool().get('cashbook.line')

        vlist = [x.copy() for x in vlist]
        records = super(SplitLine, cls).create(vlist)

        to_update_line = []
        for record in records:
            if not record.line in to_update_line:
                to_update_line.append(record.line)

        if len(to_update_line) > 0:
            Line2.update_amount_by_splitlines(to_update_line)

    @classmethod
    def write(cls, *args):
        """ deny update if cashbook.line!='open',
            add or update debit/credit
        """
        Line2 = Pool().get('cashbook.line')

        actions = iter(args)
        to_update_line = []
        for records, values in zip(actions, actions):
            Line2.check_permission_write([x.line for x in records])

            if 'amount' in values.keys():
                for record in records:
                    if not record.line in to_update_line:
                        to_update_line.append(record.line)
        super(SplitLine, cls).write(*args)

        if len(to_update_line) > 0:
            Line2.update_amount_by_splitlines(to_update_line)

    @classmethod
    def delete(cls, splitlines):
        """ deny delete if book is not 'open' or wf is not 'edit'
        """
        Line2 = Pool().get('cashbook.line')

        Line2.check_permission_delete([x.line for x in splitlines])
        return super(SplitLine, cls).delete(splitlines)

# end SplitLine