# This file is part of Tryton.  The COPYRIGHT file at the top level of
# this repository contains the full copyright notices and license terms.
from trytond.pool import Pool, PoolMeta
from trytond.model import ModelView, ModelSQL, fields
from trytond.pyson import Eval

from trytond.exceptions import UserError

class Invoice(metaclass=PoolMeta):
    'Account Invoice'
    __name__ = 'account.invoice'

    _states = {
        'readonly': Eval('state') != 'draft',
        }


    account_analytic = fields.Many2One('analytic_account.account', 'Analytic Account', required=True,
                                       domain=[('type', '=', 'normal')],
                                       states=_states)

    
class InvoiceLine(metaclass=PoolMeta):
      'Invoice Line'
      __name__ = 'account.invoice.line'

      @fields.depends('product', 'unit', '_parent_invoice.type', 'analytic_accounts',
                      '_parent_invoice.party', 'party', 'invoice', 'invoice_type',
                      '_parent_invoice.account_analytic', '_parent_invoice.invoice_date',
                      '_parent_invoice.accounting_date','company', methods=['_get_tax_rule_pattern'])
      def on_change_product(self):
          super(InvoiceLine, self).on_change_product()
          self.analytic_accounts = tuple()
          try:
              self.analytic_accounts += ({'root': self.invoice.account_analytic.root,
                                          'account': self.invoice.account_analytic},) 
          except:
              pass