[ADD] Basic tax processing from the bank statement line

account_bank_statement_tax/model/account_bank_statement.py

@@ -0,0 +1,102 @@
+# -*- coding: utf-8 -*-
+##############################################################################
+#
+#    Copyright (C) 2012 - 2013 Therp BV (<http://therp.nl>).
+#    All Rights Reserved
+#
+#    This program is free software: you can redistribute it and/or modify
+#    it under the terms of the GNU Affero General Public License as
+#    published by the Free Software Foundation, either version 3 of the
+#    License, or (at your option) any later version.
+#
+#    This program is distributed in the hope that it will be useful,
+#    but WITHOUT ANY WARRANTY; without even the implied warranty of
+#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#    GNU Affero General Public License for more details.
+#
+#    You should have received a copy of the GNU Affero General Public License
+#    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+##############################################################################
+
+from openerp.osv import orm
+from openerp.tools import ustr
+
+
+class AccountBankStatement(orm.Model):
+    _inherit = 'account.bank.statement'
+
+    def get_tax_move_lines(
+            self, cr, uid, st_line, defaults,
+            company_currency_id, context=None):
+        """
+        Process inclusive taxes on bank statement lines.
+
+        @param st_line: browse record of the statement line
+        @param defaults: dictionary of default move line values. Usually
+        the same as the originating move line.
+
+        return one or more serialized tax move lines and a set of values to 
+        update the originating move line with, containing the new amount.
+        
+        TODO: apply fiscal position, multicurrency
+        """
+
+        if not st_line.tax_id:
+            return False, False
+        tax_obj = self.pool.get('account.tax')
+        move_lines = []
+        update_move_line = {}
+        import pdb
+        pdb.set_trace()
+        base_amount = -defaults['credit'] or defaults['debit']
+        computed_taxes = tax_obj.compute_all(
+            cr, uid, [st_line.tax_id], base_amount, 1.00)
+
+        for tax in computed_taxes['taxes']:
+            if tax['tax_code_id']:
+                if not update_move_line.get('tax_code_id'):
+                    update_move_line['tax_code_id'] = tax['base_code_id']
+                    update_move_line['tax_amount'] = tax['base_sign'] * abs(
+                        computed_taxes.get('total', 0.0))
+                    # As the tax is inclusive, we need to correct the amount on the
+                    # original move line
+                    amount = computed_taxes.get('total', 0.0)
+                    update_move_line['credit'] = ((amount < 0) and -amount) or 0.0
+                    update_move_line['debit'] = ((amount > 0) and amount) or 0.0
+
+                move_lines.append({
+                    'move_id': defaults['move_id'],
+                    'name': defaults.get('name', '') + ' ' + ustr(tax['name'] or ''),
+                    'date': defaults.get('date', False),
+                    'partner_id': defaults.get('partner_id', False),
+                    'ref': defaults.get('ref', False),
+                    'statement_id': defaults.get('statement_id'),
+                    'tax_code_id': tax['tax_code_id'],
+                    'tax_amount': tax['tax_sign'] * abs(tax.get('amount', 0.0)),
+                    'account_id': tax.get('account_collected_id', defaults['account_id']),
+                    'credit': tax['amount'] < 0 and - tax['amount'] or 0.0,
+                    'debit': tax['amount'] > 0 and tax['amount'] or 0.0,
+                    'account_id': tax.get('account_collected_id', defaults['account_id']),
+                    })
+
+        return move_lines, update_move_line
+
+    def _prepare_counterpart_move_line(
+            self, cr, uid, st_line, move_id, amount, company_currency_id,
+            context=None):
+        """
+        Overload of the original method from the account module. Create
+        the tax move lines.
+        """
+        res = super(AccountBankStatement, self)._prepare_counterpart_move_line(
+            cr, uid, st_line, move_id, amount, company_currency_id,
+            context=context)
+        if st_line.tax_id:
+            tax_move_lines, counterpart_update_vals = self.get_tax_move_lines(
+                cr, uid, st_line, res, company_currency_id, context=context)
+            res.update(counterpart_update_vals)
+            for tax_move_line in tax_move_lines:
+                self.pool.get('account.move.line').create(
+                    cr, uid, tax_move_line, context=context)
+        return res