pos_order.py

# -*- coding: utf-8 -*-
# Part of Odoo. See LICENSE file for full copyright and licensing details.
import logging
from datetime import timedelta
from functools import partial

import psycopg2
import pytz

from odoo import api, fields, models, tools, _
from odoo.tools import float_is_zero
from odoo.exceptions import UserError
from odoo.http import request
import odoo.addons.decimal_precision as dp

_logger = logging.getLogger(__name__)


class PosOrder(models.Model):
    _name = "pos.order"
    _description = "Point of Sale Orders"
    _order = "id desc"

    @api.model
    def _amount_line_tax(self, line, fiscal_position_id):
        taxes = line.tax_ids.filtered(lambda t: t.company_id.id == line.order_id.company_id.id)
        if fiscal_position_id:
            taxes = fiscal_position_id.map_tax(taxes, line.product_id, line.order_id.partner_id)
        price = line.price_unit * (1 - (line.discount or 0.0) / 100.0)
        taxes = taxes.compute_all(price, line.order_id.pricelist_id.currency_id, line.qty, product=line.product_id, partner=line.order_id.partner_id or False)['taxes']
        return sum(tax.get('amount', 0.0) for tax in taxes)

    @api.model
    def _order_fields(self, ui_order):
        process_line = partial(self.env['pos.order.line']._order_line_fields)
        return {
            'name':         ui_order['name'],
            'user_id':      ui_order['user_id'] or False,
            'session_id':   ui_order['pos_session_id'],
            'lines':        [process_line(l) for l in ui_order['lines']] if ui_order['lines'] else False,
            'pos_reference': ui_order['name'],
            'partner_id':   ui_order['partner_id'] or False,
            'date_order':   ui_order['creation_date'],
            'fiscal_position_id': ui_order['fiscal_position_id']
        }

    def _payment_fields(self, ui_paymentline):
        return {
            'amount':       ui_paymentline['amount'] or 0.0,
            'payment_date': ui_paymentline['name'],
            'statement_id': ui_paymentline['statement_id'],
            'payment_name': ui_paymentline.get('note', False),
            'journal':      ui_paymentline['journal_id'],
        }

    # This deals with orders that belong to a closed session. In order
    # to recover from this situation we create a new rescue session,
    # making it obvious that something went wrong.
    # A new, separate, rescue session is preferred for every such recovery,
    # to avoid adding unrelated orders to live sessions.
    def _get_valid_session(self, order):
        PosSession = self.env['pos.session']
        closed_session = PosSession.browse(order['pos_session_id'])

        _logger.warning('session %s (ID: %s) was closed but received order %s (total: %s) belonging to it',
                        closed_session.name,
                        closed_session.id,
                        order['name'],
                        order['amount_total'])
        rescue_session = PosSession.search([
            ('name', 'like', '(RESCUE FOR %(session)s)' % {'session': closed_session.name}),
            ('state', 'not in', ('closed', 'closing_control')),
        ], limit=1)
        if rescue_session:
            _logger.warning('reusing recovery session %s for saving order %s', rescue_session.name, order['name'])
            return rescue_session

        _logger.warning('attempting to create recovery session for saving order %s', order['name'])
        new_session = PosSession.create({
            'config_id': closed_session.config_id.id,
            'name': '(RESCUE FOR %(session)s)' % {'session': closed_session.name},
        })
        # bypass opening_control (necessary when using cash control)
        new_session.action_pos_session_open()

        return new_session

    def _match_payment_to_invoice(self, order):
        account_precision = self.env['decimal.precision'].precision_get('Account')

        # ignore orders with an amount_paid of 0 because those are returns through the POS
        if not float_is_zero(order['amount_return'], account_precision) and not float_is_zero(order['amount_paid'], account_precision):
            cur_amount_paid = 0
            payments_to_keep = []
            for payment in order.get('statement_ids'):
                if cur_amount_paid + payment[2]['amount'] > order['amount_total']:
                    payment[2]['amount'] = order['amount_total'] - cur_amount_paid
                    payments_to_keep.append(payment)
                    break
                cur_amount_paid += payment[2]['amount']
                payments_to_keep.append(payment)
            order['statement_ids'] = payments_to_keep
            order['amount_return'] = 0

    @api.model
    def _process_order(self, pos_order):
        prec_acc = self.env['decimal.precision'].precision_get('Account')
        pos_session = self.env['pos.session'].browse(pos_order['pos_session_id'])
        if pos_session.state == 'closing_control' or pos_session.state == 'closed':
            pos_order['pos_session_id'] = self._get_valid_session(pos_order).id
        order = self.create(self._order_fields(pos_order))
        journal_ids = set()
        for payments in pos_order['statement_ids']:
            if not float_is_zero(payments[2]['amount'], precision_digits=prec_acc):
                order.add_payment(self._payment_fields(payments[2]))
            journal_ids.add(payments[2]['journal_id'])

        if pos_session.sequence_number <= pos_order['sequence_number']:
            pos_session.write({'sequence_number': pos_order['sequence_number'] + 1})
            pos_session.refresh()

        if not float_is_zero(pos_order['amount_return'], prec_acc):
            cash_journal_id = pos_session.cash_journal_id.id
            if not cash_journal_id:
                # Select for change one of the cash journals used in this
                # payment
                cash_journal = self.env['account.journal'].search([
                    ('type', '=', 'cash'),
                    ('id', 'in', list(journal_ids)),
                ], limit=1)
                if not cash_journal:
                    # If none, select for change one of the cash journals of the POS
                    # This is used for example when a customer pays by credit card
                    # an amount higher than total amount of the order and gets cash back
                    cash_journal = [statement.journal_id for statement in pos_session.statement_ids if statement.journal_id.type == 'cash']
                    if not cash_journal:
                        raise UserError(_("No cash statement found for this session. Unable to record returned cash."))
                cash_journal_id = cash_journal[0].id
            order.add_payment({
                'amount': -pos_order['amount_return'],
                'payment_date': fields.Datetime.now(),
                'payment_name': _('return'),
                'journal': cash_journal_id,
            })
        return order

    def _prepare_analytic_account(self, line):
        '''This method is designed to be inherited in a custom module'''
        return False

    def _create_account_move(self, dt, ref, journal_id, company_id):
        date_tz_user = fields.Datetime.context_timestamp(self, fields.Datetime.from_string(dt))
        date_tz_user = fields.Date.to_string(date_tz_user)
        return self.env['account.move'].sudo().create({'ref': ref, 'journal_id': journal_id, 'date': date_tz_user})

    def _prepare_invoice(self):
        """
        Prepare the dict of values to create the new invoice for a pos order.
        """
        return {
            'name': self.name,
            'origin': self.name,
            'account_id': self.partner_id.property_account_receivable_id.id,
            'journal_id': self.session_id.config_id.invoice_journal_id.id,
            'company_id': self.company_id.id,
            'type': 'out_invoice',
            'reference': self.name,
            'partner_id': self.partner_id.id,
            'comment': self.note or '',
            # considering partner's sale pricelist's currency
            'currency_id': self.pricelist_id.currency_id.id,
            'user_id': self.user_id.id,
        }

    def _action_create_invoice_line(self, line=False, invoice_id=False):
        InvoiceLine = self.env['account.invoice.line']
        inv_name = line.product_id.name_get()[0][1]
        inv_line = {
            'invoice_id': invoice_id,
            'product_id': line.product_id.id,
            'quantity': line.qty,
            'account_analytic_id': self._prepare_analytic_account(line),
            'name': inv_name,
        }
        # Oldlin trick
        invoice_line = InvoiceLine.sudo().new(inv_line)
        invoice_line._onchange_product_id()
        invoice_line.invoice_line_tax_ids = invoice_line.invoice_line_tax_ids.filtered(lambda t: t.company_id.id == line.order_id.company_id.id).ids
        fiscal_position_id = line.order_id.fiscal_position_id
        if fiscal_position_id:
            invoice_line.invoice_line_tax_ids = fiscal_position_id.map_tax(invoice_line.invoice_line_tax_ids, line.product_id, line.order_id.partner_id)
        invoice_line.invoice_line_tax_ids = invoice_line.invoice_line_tax_ids.ids
        # We convert a new id object back to a dictionary to write to
        # bridge between old and new api
        inv_line = invoice_line._convert_to_write({name: invoice_line[name] for name in invoice_line._cache})
        inv_line.update(price_unit=line.price_unit, discount=line.discount)
        return InvoiceLine.sudo().create(inv_line)

    def _create_account_move_line(self, session=None, move=None):
        def _flatten_tax_and_children(taxes, group_done=None):
            children = self.env['account.tax']
            if group_done is None:
                group_done = set()
            for tax in taxes.filtered(lambda t: t.amount_type == 'group'):
                if tax.id not in group_done:
                    group_done.add(tax.id)
                    children |= _flatten_tax_and_children(tax.children_tax_ids, group_done)
            return taxes + children

        # Tricky, via the workflow, we only have one id in the ids variable
        """Create a account move line of order grouped by products or not."""
        IrProperty = self.env['ir.property']
        ResPartner = self.env['res.partner']

        if session and not all(session.id == order.session_id.id for order in self):
            raise UserError(_('Selected orders do not have the same session!'))

        grouped_data = {}
        have_to_group_by = session and session.config_id.group_by or False
        rounding_method = session and session.config_id.company_id.tax_calculation_rounding_method

        def add_anglosaxon_lines(grouped_data):
            Product = self.env['product.product']
            Analytic = self.env['account.analytic.account']
            for product_key in list(grouped_data.keys()):
                if product_key[0] == "product":
                    line = grouped_data[product_key][0]
                    product = Product.browse(line['product_id'])
                    # In the SO part, the entries will be inverted by function compute_invoice_totals
                    price_unit = - product._get_anglo_saxon_price_unit()
                    account_analytic = Analytic.browse(line.get('analytic_account_id'))
                    res = Product._anglo_saxon_sale_move_lines(
                        line['name'], product, product.uom_id, line['quantity'], price_unit,
                            fiscal_position=order.fiscal_position_id,
                            account_analytic=account_analytic)
                    if res:
                        line1, line2 = res
                        line1 = Product._convert_prepared_anglosaxon_line(line1, order.partner_id)
                        insert_data('counter_part', {
                            'name': line1['name'],
                            'account_id': line1['account_id'],
                            'credit': line1['credit'] or 0.0,
                            'debit': line1['debit'] or 0.0,
                            'partner_id': line1['partner_id']

                        })

                        line2 = Product._convert_prepared_anglosaxon_line(line2, order.partner_id)
                        insert_data('counter_part', {
                            'name': line2['name'],
                            'account_id': line2['account_id'],
                            'credit': line2['credit'] or 0.0,
                            'debit': line2['debit'] or 0.0,
                            'partner_id': line2['partner_id']
                        })

        for order in self.filtered(lambda o: not o.account_move or o.state == 'paid'):
            current_company = order.sale_journal.company_id
            account_def = IrProperty.get(
                'property_account_receivable_id', 'res.partner')
            order_account = order.partner_id.property_account_receivable_id.id or account_def and account_def.id
            partner_id = ResPartner._find_accounting_partner(order.partner_id).id or False
            if move is None:
                # Create an entry for the sale
                journal_id = self.env['ir.config_parameter'].sudo().get_param(
                    'pos.closing.journal_id_%s' % current_company.id, default=order.sale_journal.id)
                move = self._create_account_move(
                    order.session_id.start_at, order.name, int(journal_id), order.company_id.id)

            def insert_data(data_type, values):
                # if have_to_group_by:
                values.update({
                    'partner_id': partner_id,
                    'move_id': move.id,
                })

                if data_type == 'product':
                    key = ('product', values['partner_id'], (values['product_id'], tuple(values['tax_ids'][0][2]), values['name']), values['analytic_account_id'], values['debit'] > 0)
                elif data_type == 'tax':
                    key = ('tax', values['partner_id'], values['tax_line_id'], values['debit'] > 0)
                elif data_type == 'counter_part':
                    key = ('counter_part', values['partner_id'], values['account_id'], values['debit'] > 0)
                else:
                    return

                grouped_data.setdefault(key, [])

                if have_to_group_by:
                    if not grouped_data[key]:
                        grouped_data[key].append(values)
                    else:
                        current_value = grouped_data[key][0]
                        current_value['quantity'] = current_value.get('quantity', 0.0) + values.get('quantity', 0.0)
                        current_value['credit'] = current_value.get('credit', 0.0) + values.get('credit', 0.0)
                        current_value['debit'] = current_value.get('debit', 0.0) + values.get('debit', 0.0)
                else:
                    grouped_data[key].append(values)

            # because of the weird way the pos order is written, we need to make sure there is at least one line,
            # because just after the 'for' loop there are references to 'line' and 'income_account' variables (that
            # are set inside the for loop)
            # TOFIX: a deep refactoring of this method (and class!) is needed
            # in order to get rid of this stupid hack
            assert order.lines, _('The POS order must have lines when calling this method')
            # Create an move for each order line
            cur = order.pricelist_id.currency_id
            for line in order.lines:
                amount = line.price_subtotal

                # Search for the income account
                if line.product_id.property_account_income_id.id:
                    income_account = line.product_id.property_account_income_id.id
                elif line.product_id.categ_id.property_account_income_categ_id.id:
                    income_account = line.product_id.categ_id.property_account_income_categ_id.id
                else:
                    raise UserError(_('Please define income '
                                      'account for this product: "%s" (id:%d).')
                                    % (line.product_id.name, line.product_id.id))

                name = line.product_id.name
                if line.notice:
                    # add discount reason in move
                    name = name + ' (' + line.notice + ')'

                # Create a move for the line for the order line
                # Just like for invoices, a group of taxes must be present on this base line
                # As well as its children
                base_line_tax_ids = _flatten_tax_and_children(line.tax_ids_after_fiscal_position).filtered(lambda tax: tax.type_tax_use in ['sale', 'none'])
                insert_data('product', {
                    'name': name,
                    'quantity': line.qty,
                    'product_id': line.product_id.id,
                    'account_id': income_account,
                    'analytic_account_id': self._prepare_analytic_account(line),
                    'credit': ((amount > 0) and amount) or 0.0,
                    'debit': ((amount < 0) and -amount) or 0.0,
                    'tax_ids': [(6, 0, base_line_tax_ids.ids)],
                    'partner_id': partner_id
                })

                # Create the tax lines
                taxes = line.tax_ids_after_fiscal_position.filtered(lambda t: t.company_id.id == current_company.id)
                if not taxes:
                    continue
                price = line.price_unit * (1 - (line.discount or 0.0) / 100.0)
                for tax in taxes.compute_all(price, cur, line.qty)['taxes']:
                    insert_data('tax', {
                        'name': _('Tax') + ' ' + tax['name'],
                        'product_id': line.product_id.id,
                        'quantity': line.qty,
                        'account_id': tax['account_id'] or income_account,
                        'credit': ((tax['amount'] > 0) and tax['amount']) or 0.0,
                        'debit': ((tax['amount'] < 0) and -tax['amount']) or 0.0,
                        'tax_line_id': tax['id'],
                        'partner_id': partner_id
                    })

            # round tax lines per order
            if rounding_method == 'round_globally':
                for group_key, group_value in grouped_data.iteritems():
                    if group_key[0] == 'tax':
                        for line in group_value:
                            line['credit'] = cur.round(line['credit'])
                            line['debit'] = cur.round(line['debit'])

            # counterpart
            insert_data('counter_part', {
                'name': _("Trade Receivables"),  # order.name,
                'account_id': order_account,
                'credit': ((order.amount_total < 0) and -order.amount_total) or 0.0,
                'debit': ((order.amount_total > 0) and order.amount_total) or 0.0,
                'partner_id': partner_id
            })

            order.write({'state': 'done', 'account_move': move.id})

        if self and order.company_id.anglo_saxon_accounting:
            add_anglosaxon_lines(grouped_data)

        all_lines = []
        for group_key, group_data in grouped_data.iteritems():
            for value in group_data:
                all_lines.append((0, 0, value),)
        if move:  # In case no order was changed
            move.sudo().write({'line_ids': all_lines})
            move.sudo().post()
        return True

    def _reconcile_payments(self):
        for order in self:
            aml = order.statement_ids.mapped('journal_entry_ids').mapped('line_ids') | order.account_move.line_ids | order.invoice_id.move_id.line_ids
            aml = aml.filtered(lambda r: not r.reconciled and r.account_id.internal_type == 'receivable' and r.partner_id == order.partner_id.commercial_partner_id)

            try:
                # Cash returns will be well reconciled
                # Whereas freight returns won't be
                # "c'est la vie..."
                aml.reconcile()
            except:
                # There might be unexpected situations where the automatic reconciliation won't
                # work. We don't want the user to be blocked because of this, since the automatic
                # reconciliation is introduced for convenience, not for mandatory accounting
                # reasons.
                # It may be interesting to have the Traceback logged anyway
                # for debugging and support purposes
                _logger.exception('Reconciliation did not work for order %s', order.name)

    def _filtered_for_reconciliation(self):
        filter_states = ['invoiced', 'done']
        if self.env['ir.config_parameter'].sudo().get_param('point_of_sale.order_reconcile_mode', 'all') == 'partner_only':
            return self.filtered(lambda order: order.state in filter_states and order.partner_id)
        return self.filtered(lambda order: order.state in filter_states)

    def _default_session(self):
        return self.env['pos.session'].search([('state', '=', 'opened'), ('user_id', '=', self.env.uid)], limit=1)

    def _default_pricelist(self):
        return self._default_session().config_id.pricelist_id

    name = fields.Char(string='Order Ref', required=True, readonly=True, copy=False, default='/')
    company_id = fields.Many2one('res.company', string='Company', required=True, readonly=True, default=lambda self: self.env.user.company_id)
    date_order = fields.Datetime(string='Order Date', readonly=True, index=True, default=fields.Datetime.now)
    user_id = fields.Many2one(
        comodel_name='res.users', string='Salesman',
        help="Person who uses the cash register. It can be a reliever, a student or an interim employee.",
        default=lambda self: self.env.uid,
        states={'done': [('readonly', True)], 'invoiced': [('readonly', True)]},
    )
    amount_tax = fields.Float(compute='_compute_amount_all', string='Taxes', digits=0)
    amount_total = fields.Float(compute='_compute_amount_all', string='Total', digits=0)
    amount_paid = fields.Float(compute='_compute_amount_all', string='Paid', states={'draft': [('readonly', False)]}, readonly=True, digits=0)
    amount_return = fields.Float(compute='_compute_amount_all', string='Returned', digits=0)
    lines = fields.One2many('pos.order.line', 'order_id', string='Order Lines', states={'draft': [('readonly', False)]}, readonly=True, copy=True)
    statement_ids = fields.One2many('account.bank.statement.line', 'pos_statement_id', string='Payments', states={'draft': [('readonly', False)]}, readonly=True)
    pricelist_id = fields.Many2one('product.pricelist', string='Pricelist', required=True, states={
                                   'draft': [('readonly', False)]}, readonly=True, default=_default_pricelist)
    partner_id = fields.Many2one('res.partner', string='Customer', change_default=True, index=True, states={'draft': [('readonly', False)], 'paid': [('readonly', False)]})
    sequence_number = fields.Integer(string='Sequence Number', help='A session-unique sequence number for the order', default=1)

    session_id = fields.Many2one(
        'pos.session', string='Session', required=True, index=True,
        domain="[('state', '=', 'opened')]", states={'draft': [('readonly', False)]},
        readonly=True, default=_default_session)
    config_id = fields.Many2one('pos.config', related='session_id.config_id', string="Point of Sale")
    state = fields.Selection(
        [('draft', 'New'), ('cancel', 'Cancelled'), ('paid', 'Paid'), ('done', 'Posted'), ('invoiced', 'Invoiced')],
        'Status', readonly=True, copy=False, default='draft')

    invoice_id = fields.Many2one('account.invoice', string='Invoice', copy=False)
    account_move = fields.Many2one('account.move', string='Journal Entry', readonly=True, copy=False)
    picking_id = fields.Many2one('stock.picking', string='Picking', readonly=True, copy=False)
    picking_type_id = fields.Many2one('stock.picking.type', related='session_id.config_id.picking_type_id', string="Picking Type")
    location_id = fields.Many2one(
        comodel_name='stock.location',
        related='session_id.config_id.stock_location_id',
        string="Location", store=True,
        readonly=True,
    )
    note = fields.Text(string='Internal Notes')
    nb_print = fields.Integer(string='Number of Print', readonly=True, copy=False, default=0)
    pos_reference = fields.Char(string='Receipt Ref', readonly=True, copy=False)
    sale_journal = fields.Many2one('account.journal', related='session_id.config_id.journal_id', string='Sale Journal', store=True, readonly=True)
    fiscal_position_id = fields.Many2one(
        comodel_name='account.fiscal.position', string='Fiscal Position',
        default=lambda self: self._default_session().config_id.default_fiscal_position_id,
        readonly=True,
        states={'draft': [('readonly', False)]},
    )

    @api.depends('statement_ids', 'lines.price_subtotal_incl', 'lines.discount')
    def _compute_amount_all(self):
        for order in self:
            order.amount_paid = order.amount_return = order.amount_tax = 0.0
            currency = order.pricelist_id.currency_id
            order.amount_paid = sum(payment.amount for payment in order.statement_ids)
            order.amount_return = sum(payment.amount < 0 and payment.amount or 0 for payment in order.statement_ids)
            order.amount_tax = currency.round(sum(self._amount_line_tax(line, order.fiscal_position_id) for line in order.lines))
            amount_untaxed = currency.round(sum(line.price_subtotal for line in order.lines))
            order.amount_total = order.amount_tax + amount_untaxed

    @api.onchange('partner_id')
    def _onchange_partner_id(self):
        if self.partner_id:
            self.pricelist = self.partner_id.property_product_pricelist.id

    @api.multi
    def write(self, vals):
        res = super(PosOrder, self).write(vals)
        Partner = self.env['res.partner']
        # If you change the partner of the PoS order, change also the partner of the associated bank statement lines
        if 'partner_id' in vals:
            for order in self:
                partner_id = False
                if order.invoice_id:
                    raise UserError(_("You cannot change the partner of a POS order for which an invoice has already been issued."))
                if vals['partner_id']:
                    partner = Partner.browse(vals['partner_id'])
                    partner_id = Partner._find_accounting_partner(partner).id
                order.statement_ids.write({'partner_id': partner_id})
        return res

    @api.multi
    def unlink(self):
        for pos_order in self.filtered(lambda pos_order: pos_order.state not in ['draft', 'cancel']):
            raise UserError(_('In order to delete a sale, it must be new or cancelled.'))
        return super(PosOrder, self).unlink()

    @api.model
    def create(self, values):
        if values.get('session_id'):
            # set name based on the sequence specified on the config
            session = self.env['pos.session'].browse(values['session_id'])
            values['name'] = session.config_id.sequence_id._next()
            values.setdefault('pricelist_id', session.config_id.pricelist_id.id)
        else:
            # fallback on any pos.order sequence
            values['name'] = self.env['ir.sequence'].next_by_code('pos.order')
        return super(PosOrder, self).create(values)

    @api.multi
    def action_view_invoice(self):
        return {
            'name': _('Customer Invoice'),
            'view_mode': 'form',
            'view_id': self.env.ref('account.invoice_form').id,
            'res_model': 'account.invoice',
            'context': "{'type':'out_invoice'}",
            'type': 'ir.actions.act_window',
            'res_id': self.invoice_id.id,
        }

    @api.multi
    def action_pos_order_paid(self):
        if not self.test_paid():
            raise UserError(_("Order is not paid."))
        self.write({'state': 'paid'})
        return self.create_picking()

    @api.multi
    def action_pos_order_invoice(self):
        Invoice = self.env['account.invoice']

        for order in self:
            # Force company for all SUPERUSER_ID action
            local_context = dict(self.env.context, force_company=order.company_id.id, company_id=order.company_id.id)
            if order.invoice_id:
                Invoice += order.invoice_id
                continue

            if not order.partner_id:
                raise UserError(_('Please provide a partner for the sale.'))

            invoice = Invoice.new(order._prepare_invoice())
            invoice._onchange_partner_id()
            invoice.fiscal_position_id = order.fiscal_position_id

            inv = invoice._convert_to_write({name: invoice[name] for name in invoice._cache})
            new_invoice = Invoice.with_context(local_context).sudo().create(inv)
            message = _("This invoice has been created from the point of sale session: <a href=# data-oe-model=pos.order data-oe-id=%d>%s</a>") % (order.id, order.name)
            new_invoice.message_post(body=message)
            order.write({'invoice_id': new_invoice.id, 'state': 'invoiced'})
            Invoice += new_invoice

            for line in order.lines:
                self.with_context(local_context)._action_create_invoice_line(line, new_invoice.id)

            new_invoice.with_context(local_context).sudo().compute_taxes()
            order.sudo().write({'state': 'invoiced'})
            # this workflow signal didn't exist on account.invoice -> should it have been 'invoice_open' ? (and now method .action_invoice_open())
            # shouldn't the created invoice be marked as paid, seing the customer paid in the POS?
            # new_invoice.sudo().signal_workflow('validate')

        if not Invoice:
            return {}

        return {
            'name': _('Customer Invoice'),
            'view_type': 'form',
            'view_mode': 'form',
            'view_id': self.env.ref('account.invoice_form').id,
            'res_model': 'account.invoice',
            'context': "{'type':'out_invoice'}",
            'type': 'ir.actions.act_window',
            'nodestroy': True,
            'target': 'current',
            'res_id': Invoice and Invoice.ids[0] or False,
        }

    # this method is unused, and so is the state 'cancel'
    @api.multi
    def action_pos_order_cancel(self):
        return self.write({'state': 'cancel'})

    @api.multi
    def action_pos_order_done(self):
        return self._create_account_move_line()

    @api.model
    def create_from_ui(self, orders):
        # Keep only new orders
        submitted_references = [o['data']['name'] for o in orders]
        pos_order = self.search([('pos_reference', 'in', submitted_references)])
        existing_orders = pos_order.read(['pos_reference'])
        existing_references = set([o['pos_reference'] for o in existing_orders])
        orders_to_save = [o for o in orders if o['data']['name'] not in existing_references]
        order_ids = []

        for tmp_order in orders_to_save:
            to_invoice = tmp_order['to_invoice']
            order = tmp_order['data']
            if to_invoice:
                self._match_payment_to_invoice(order)
            pos_order = self._process_order(order)
            order_ids.append(pos_order.id)

            try:
                pos_order.action_pos_order_paid()
            except psycopg2.DatabaseError:
                # do not hide transactional errors, the order(s) won't be saved!
                raise
            except Exception as e:
                _logger.error('Could not fully process the POS Order: %s', tools.ustr(e))

            if to_invoice:
                pos_order.action_pos_order_invoice()
                pos_order.invoice_id.sudo().action_invoice_open()
                pos_order.account_move = pos_order.invoice_id.move_id
        return order_ids

    def test_paid(self):
        """A Point of Sale is paid when the sum
        @return: True
        """
        for order in self:
            if order.lines and not order.amount_total:
                continue
            if (not order.lines) or (not order.statement_ids) or (abs(order.amount_total - order.amount_paid) > 0.00001):
                return False
        return True

    def create_picking(self):
        """Create a picking for each order and validate it."""
        Picking = self.env['stock.picking']
        Move = self.env['stock.move']
        StockWarehouse = self.env['stock.warehouse']
        for order in self:
            if not order.lines.filtered(lambda l: l.product_id.type in ['product', 'consu']):
                continue
            address = order.partner_id.address_get(['delivery']) or {}
            picking_type = order.picking_type_id
            return_pick_type = order.picking_type_id.return_picking_type_id or order.picking_type_id
            order_picking = Picking
            return_picking = Picking
            moves = Move
            location_id = order.location_id.id
            if order.partner_id:
                destination_id = order.partner_id.property_stock_customer.id
            else:
                if (not picking_type) or (not picking_type.default_location_dest_id):
                    customerloc, supplierloc = StockWarehouse._get_partner_locations()
                    destination_id = customerloc.id
                else:
                    destination_id = picking_type.default_location_dest_id.id

            if picking_type:
                message = _("This transfer has been created from the point of sale session: <a href=# data-oe-model=pos.order data-oe-id=%d>%s</a>") % (order.id, order.name)
                picking_vals = {
                    'origin': order.name,
                    'partner_id': address.get('delivery', False),
                    'date_done': order.date_order,
                    'picking_type_id': picking_type.id,
                    'company_id': order.company_id.id,
                    'move_type': 'direct',
                    'note': order.note or "",
                    'location_id': location_id,
                    'location_dest_id': destination_id,
                }
                pos_qty = any([x.qty > 0 for x in order.lines if x.product_id.type in ['product', 'consu']])
                if pos_qty:
                    order_picking = Picking.create(picking_vals.copy())
                    order_picking.message_post(body=message)
                neg_qty = any([x.qty < 0 for x in order.lines if x.product_id.type in ['product', 'consu']])
                if neg_qty:
                    return_vals = picking_vals.copy()
                    return_vals.update({
                        'location_id': destination_id,
                        'location_dest_id': return_pick_type != picking_type and return_pick_type.default_location_dest_id.id or location_id,
                        'picking_type_id': return_pick_type.id
                    })
                    return_picking = Picking.create(return_vals)
                    return_picking.message_post(body=message)

            for line in order.lines.filtered(lambda l: l.product_id.type in ['product', 'consu'] and not float_is_zero(l.qty, precision_rounding=l.product_id.uom_id.rounding)):
                moves |= Move.create({
                    'name': line.name,
                    'product_uom': line.product_id.uom_id.id,
                    'picking_id': order_picking.id if line.qty >= 0 else return_picking.id,
                    'picking_type_id': picking_type.id if line.qty >= 0 else return_pick_type.id,
                    'product_id': line.product_id.id,
                    'product_uom_qty': abs(line.qty),
                    'state': 'draft',
                    'location_id': location_id if line.qty >= 0 else destination_id,
                    'location_dest_id': destination_id if line.qty >= 0 else return_pick_type != picking_type and return_pick_type.default_location_dest_id.id or location_id,
                })

            # prefer associating the regular order picking, not the return
            order.write({'picking_id': order_picking.id or return_picking.id})

            if return_picking:
                order._force_picking_done(return_picking)
            if order_picking:
                order._force_picking_done(order_picking)

            # when the pos.config has no picking_type_id set only the moves will be created
            if moves and not return_picking and not order_picking:
                tracked_moves = moves.filtered(lambda move: move.product_id.tracking != 'none')
                untracked_moves = moves - tracked_moves
                tracked_moves.action_confirm()
                untracked_moves.action_assign()
                moves.filtered(lambda m: m.state in ['confirmed', 'waiting']).force_assign()
                moves.filtered(lambda m: m.product_id.tracking == 'none').action_done()

        return True

    def _force_picking_done(self, picking):
        """Force picking in order to be set as done."""
        self.ensure_one()
        contains_tracked_products = any([(product_id.tracking != 'none') for product_id in self.lines.mapped('product_id')])

        # do not reserve for tracked products, the user will have manually specified the serial/lot numbers
        if contains_tracked_products:
            picking.action_confirm()
        else:
            picking.action_assign()

        picking.force_assign()
        self.set_pack_operation_lot(picking)
        if not contains_tracked_products:
            picking.action_done()

    def set_pack_operation_lot(self, picking=None):
        """Set Serial/Lot number in pack operations to mark the pack operation done."""

        StockProductionLot = self.env['stock.production.lot']
        PosPackOperationLot = self.env['pos.pack.operation.lot']

        for order in self:
            for pack_operation in (picking or self.picking_id).pack_operation_ids:
                qty = 0
                qty_done = 0
                pack_lots = []
                pos_pack_lots = PosPackOperationLot.search([('order_id', '=', order.id), ('product_id', '=', pack_operation.product_id.id)])
                pack_lot_names = [pos_pack.lot_name for pos_pack in pos_pack_lots]

                if pack_lot_names:
                    for lot_name in list(set(pack_lot_names)):
                        stock_production_lot = StockProductionLot.search([('name', '=', lot_name), ('product_id', '=', pack_operation.product_id.id)])
                        if stock_production_lot:
                            if stock_production_lot.product_id.tracking == 'lot':
                                qty = pack_lot_names.count(lot_name)
                            else:
                                qty = 1.0
                            qty_done += qty
                            pack_lots.append({'lot_id': stock_production_lot.id, 'qty': qty})
                else:
                    qty_done = pack_operation.product_qty
                pack_operation.write({'pack_lot_ids': map(lambda x: (0, 0, x), pack_lots), 'qty_done': qty_done})

    def _prepare_bank_statement_line_payment_values(self, data):
        """Create a new payment for the order"""
        args = {
            'amount': data['amount'],
            'date': data.get('payment_date', fields.Date.today()),
            'name': self.name + ': ' + (data.get('payment_name', '') or ''),
            'partner_id': self.env["res.partner"]._find_accounting_partner(self.partner_id).id or False,
        }

        journal_id = data.get('journal', False)
        statement_id = data.get('statement_id', False)
        assert journal_id or statement_id, "No statement_id or journal_id passed to the method!"

        journal = self.env['account.journal'].browse(journal_id)
        # use the company of the journal and not of the current user
        company_cxt = dict(self.env.context, force_company=journal.company_id.id)
        account_def = self.env['ir.property'].with_context(company_cxt).get('property_account_receivable_id', 'res.partner')
        args['account_id'] = (self.partner_id.property_account_receivable_id.id) or (account_def and account_def.id) or False

        if not args['account_id']:
            if not args['partner_id']:
                msg = _('There is no receivable account defined to make payment.')
            else:
                msg = _('There is no receivable account defined to make payment for the partner: "%s" (id:%d).') % (
                    self.partner_id.name, self.partner_id.id,)
            raise UserError(msg)

        context = dict(self.env.context)
        context.pop('pos_session_id', False)
        for statement in self.session_id.statement_ids:
            if statement.id == statement_id:
                journal_id = statement.journal_id.id
                break
            elif statement.journal_id.id == journal_id:
                statement_id = statement.id
                break
        if not statement_id:
            raise UserError(_('You have to open at least one cashbox.'))

        args.update({
            'statement_id': statement_id,
            'pos_statement_id': self.id,
            'journal_id': journal_id,
            'ref': self.session_id.name,
        })

        return args

    def add_payment(self, data):
        """Create a new payment for the order"""
        args = self._prepare_bank_statement_line_payment_values(data)
        context = dict(self.env.context)
        context.pop('pos_session_id', False)
        self.env['account.bank.statement.line'].with_context(context).create(args)
        return args.get('statement_id', False)

    @api.multi
    def refund(self):
        """Create a copy of order  for refund order"""
        PosOrder = self.env['pos.order']
        current_session = self.env['pos.session'].search([('state', '!=', 'closed'), ('user_id', '=', self.env.uid)], limit=1)
        if not current_session:
            raise UserError(_('To return product(s), you need to open a session that will be used to register the refund.'))
        for order in self:
            clone = order.copy({
                # ot used, name forced by create
                'name': order.name + _(' REFUND'),
                'session_id': current_session.id,
                'date_order': fields.Datetime.now(),
                'pos_reference': order.pos_reference,
            })
            PosOrder += clone

        for clone in PosOrder:
            for order_line in clone.lines:
                order_line.write({'qty': -order_line.qty})
        return {
            'name': _('Return Products'),
            'view_type': 'form',
            'view_mode': 'form',
            'res_model': 'pos.order',
            'res_id': PosOrder.ids[0],
            'view_id': False,
            'context': self.env.context,
            'type': 'ir.actions.act_window',
            'target': 'current',
        }


class PosOrderLine(models.Model):
    _name = "pos.order.line"
    _description = "Lines of Point of Sale"
    _rec_name = "product_id"

    def _order_line_fields(self, line):
        if line and 'tax_ids' not in line[2]:
            product = self.env['product.product'].browse(line[2]['product_id'])
            line[2]['tax_ids'] = [(6, 0, [x.id for x in product.taxes_id])]
        return line

    company_id = fields.Many2one('res.company', string='Company', required=True, default=lambda self: self.env.user.company_id)
    name = fields.Char(string='Line No', required=True, copy=False)
    notice = fields.Char(string='Discount Notice')
    product_id = fields.Many2one('product.product', string='Product', domain=[('sale_ok', '=', True)], required=True, change_default=True)
    price_unit = fields.Float(string='Unit Price', digits=0)
    qty = fields.Float('Quantity', digits=dp.get_precision('Product Unit of Measure'), default=1)
    price_subtotal = fields.Float(compute='_compute_amount_line_all', digits=0, string='Subtotal w/o Tax')
    price_subtotal_incl = fields.Float(compute='_compute_amount_line_all', digits=0, string='Subtotal')
    discount = fields.Float(string='Discount (%)', digits=0, default=0.0)
    order_id = fields.Many2one('pos.order', string='Order Ref', ondelete='cascade')
    create_date = fields.Datetime(string='Creation Date', readonly=True)
    tax_ids = fields.Many2many('account.tax', string='Taxes', readonly=True)
    tax_ids_after_fiscal_position = fields.Many2many('account.tax', compute='_get_tax_ids_after_fiscal_position', string='Taxes')
    pack_lot_ids = fields.One2many('pos.pack.operation.lot', 'pos_order_line_id', string='Lot/serial Number')

    @api.model
    def create(self, values):
        if values.get('order_id') and not values.get('name'):
            # set name based on the sequence specified on the config
            config_id = self.order_id.browse(values['order_id']).session_id.config_id.id
            # HACK: sequence created in the same transaction as the config
            # cf TODO master is pos.config create
            # remove me saas-15
            self.env.cr.execute("""
                SELECT s.id
                FROM ir_sequence s
                JOIN pos_config c
                  ON s.create_date=c.create_date
                WHERE c.id = %s
                  AND s.code = 'pos.order.line'
                LIMIT 1
                """, (config_id,))
            sequence = self.env.cr.fetchone()
            if sequence:
                values['name'] = self.env['ir.sequence'].browse(sequence[0])._next()
        if not values.get('name'):
            # fallback on any pos.order sequence
            values['name'] = self.env['ir.sequence'].next_by_code('pos.order.line')
        return super(PosOrderLine, self).create(values)

    @api.depends('price_unit', 'tax_ids', 'qty', 'discount', 'product_id')
    def _compute_amount_line_all(self):
        for line in self:
            fpos = line.order_id.fiscal_position_id
            tax_ids_after_fiscal_position = fpos.map_tax(line.tax_ids, line.product_id, line.order_id.partner_id) if fpos else line.tax_ids
            price = line.price_unit * (1 - (line.discount or 0.0) / 100.0)
            taxes = tax_ids_after_fiscal_position.compute_all(price, line.order_id.pricelist_id.currency_id, line.qty, product=line.product_id, partner=line.order_id.partner_id)
            line.update({
                'price_subtotal_incl': taxes['total_included'],
                'price_subtotal': taxes['total_excluded'],
            })

    @api.onchange('product_id')
    def _onchange_product_id(self):
        if self.product_id:
            if not self.order_id.pricelist_id:
                raise UserError(
                    _('You have to select a pricelist in the sale form !\n'
                      'Please set one before choosing a product.'))
            price = self.order_id.pricelist_id.get_product_price(
                self.product_id, self.qty or 1.0, self.order_id.partner_id)
            self._onchange_qty()
            self.tax_ids = self.product_id.taxes_id.filtered(lambda r: not self.company_id or r.company_id == self.company_id)
            fpos = self.order_id.fiscal_position_id
            tax_ids_after_fiscal_position = fpos.map_tax(self.tax_ids, self.product_id, self.order_id.partner_id) if fpos else self.tax_ids
            self.price_unit = self.env['account.tax']._fix_tax_included_price_company(price, self.product_id.taxes_id, tax_ids_after_fiscal_position, self.company_id)

    @api.onchange('qty', 'discount', 'price_unit', 'tax_ids')
    def _onchange_qty(self):
        if self.product_id:
            if not self.order_id.pricelist_id:
                raise UserError(_('You have to select a pricelist in the sale form !'))
            price = self.price_unit * (1 - (self.discount or 0.0) / 100.0)
            self.price_subtotal = self.price_subtotal_incl = price * self.qty
            if (self.product_id.taxes_id):
                taxes = self.product_id.taxes_id.compute_all(price, self.order_id.pricelist_id.currency_id, self.qty, product=self.product_id, partner=False)
                self.price_subtotal = taxes['total_excluded']
                self.price_subtotal_incl = taxes['total_included']

    @api.multi
    def _get_tax_ids_after_fiscal_position(self):
        for line in self:
            line.tax_ids_after_fiscal_position = line.order_id.fiscal_position_id.map_tax(line.tax_ids, line.product_id, line.order_id.partner_id)


class PosOrderLineLot(models.Model):
    _name = "pos.pack.operation.lot"
    _description = "Specify product lot/serial number in pos order line"

    pos_order_line_id = fields.Many2one('pos.order.line')
    order_id = fields.Many2one('pos.order', related="pos_order_line_id.order_id")
    lot_name = fields.Char('Lot Name')
    product_id = fields.Many2one('product.product', related='pos_order_line_id.product_id')


class ReportSaleDetails(models.AbstractModel):

    _name = 'report.point_of_sale.report_saledetails'


    @api.model
    def get_sale_details(self, date_start=False, date_stop=False, configs=False):
        """ Serialise the orders of the day information

        params: date_start, date_stop string representing the datetime of order
        """
        if not configs:
            configs = self.env['pos.config'].search([])

        user_tz = pytz.timezone(self.env.context.get('tz') or self.env.user.tz or 'UTC')
        today = user_tz.localize(fields.Datetime.from_string(fields.Date.context_today(self)))
        today = today.astimezone(pytz.timezone('UTC'))
        if date_start:
            date_start = fields.Datetime.from_string(date_start)
        else:
            # start by default today 00:00:00
            date_start = today

        if date_stop:
            # set time to 23:59:59
            date_stop = fields.Datetime.from_string(date_stop)
        else:
            # stop by default today 23:59:59
            date_stop = today + timedelta(days=1, seconds=-1)

        # avoid a date_stop smaller than date_start
        date_stop = max(date_stop, date_start)

        date_start = fields.Datetime.to_string(date_start)
        date_stop = fields.Datetime.to_string(date_stop)

        orders = self.env['pos.order'].search([
            ('date_order', '>=', date_start),
            ('date_order', '<=', date_stop),
            ('state', 'in', ['paid','invoiced','done']),
            ('config_id', 'in', configs.ids)])

        user_currency = self.env.user.company_id.currency_id

        total = 0.0
        products_sold = {}
        taxes = {}
        for order in orders:
            if user_currency != order.pricelist_id.currency_id:
                total += order.pricelist_id.currency_id.compute(order.amount_total, user_currency)
            else:
                total += order.amount_total
            currency = order.session_id.currency_id

            for line in order.lines:
                key = (line.product_id, line.price_unit, line.discount)
                products_sold.setdefault(key, 0.0)
                products_sold[key] += line.qty

                if line.tax_ids_after_fiscal_position:
                    line_taxes = line.tax_ids_after_fiscal_position.compute_all(line.price_unit * (1-(line.discount or 0.0)/100.0), currency, line.qty, product=line.product_id, partner=line.order_id.partner_id or False)
                    for tax in line_taxes['taxes']:
                        taxes.setdefault(tax['id'], {'name': tax['name'], 'total':0.0})
                        taxes[tax['id']]['total'] += tax['amount']

        st_line_ids = self.env["account.bank.statement.line"].search([('pos_statement_id', 'in', orders.ids)]).ids
        if st_line_ids:
            self.env.cr.execute("""
                SELECT aj.name, sum(amount) total
                FROM account_bank_statement_line AS absl,
                     account_bank_statement AS abs,
                     account_journal AS aj 
                WHERE absl.statement_id = abs.id
                    AND abs.journal_id = aj.id 
                    AND absl.id IN %s 
                GROUP BY aj.name
            """, (tuple(st_line_ids),))
            payments = self.env.cr.dictfetchall()
        else:
            payments = []

        return {
            'currency_precision': user_currency.decimal_places,
            'total_paid': user_currency.round(total),
            'payments': payments,
            'company_name': self.env.user.company_id.name,
            'taxes': taxes.values(),
            'products': sorted([{
                'product_id': product.id,
                'product_name': product.name,
                'code': product.default_code,
                'quantity': qty,
                'price_unit': price_unit,
                'discount': discount,
                'uom': product.uom_id.name
            } for (product, price_unit, discount), qty in products_sold.items()], key=lambda l: l['product_name'])
        }

    @api.multi
    def render_html(self, docids, data=None):
        data = dict(data or {})
        configs = self.env['pos.config'].browse(data['config_ids'])
        data.update(self.get_sale_details(data['date_start'], data['date_stop'], configs))
        return self.env['report'].render('point_of_sale.report_saledetails', data)