# -*- coding: utf-8 -*-
##############################################################################
#
#    OpenERP, Open Source Management Solution
#    Copyright (C) 2004-2010 Tiny SPRL (<http://tiny.be>).
#
#    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/>.
#
##############################################################################

import time
from lxml import etree

from openerp import netsvc
from openerp.osv import fields, osv
import openerp.addons.decimal_precision as dp
from openerp.tools.translate import _
from openerp.tools import float_compare

class res_company(osv.osv):
    _inherit = "res.company"
    _columns = {
        'income_currency_exchange_account_id': fields.many2one(
            'account.account',
            string="Gain Exchange Rate Account",
            domain="[('type', '=', 'other')]",),
        'expense_currency_exchange_account_id': fields.many2one(
            'account.account',
            string="Loss Exchange Rate Account",
            domain="[('type', '=', 'other')]",),
    }

res_company()

class account_config_settings(osv.osv_memory):
    _inherit = 'account.config.settings'
    _columns = {
        'income_currency_exchange_account_id': fields.related(
            'company_id', 'income_currency_exchange_account_id',
            type='many2one',
            relation='account.account',
            string="Gain Exchange Rate Account"),
        'expense_currency_exchange_account_id': fields.related(
            'company_id', 'expense_currency_exchange_account_id',
            type="many2one",
            relation='account.account',
            string="Loss Exchange Rate Account"),
    }

class account_voucher(osv.osv):
    def _check_paid(self, cr, uid, ids, name, args, context=None):
        res = {}
        for voucher in self.browse(cr, uid, ids, context=context):
            res[voucher.id] = any([((line.account_id.type, 'in', ('receivable', 'payable')) and line.reconcile_id) for line in voucher.move_ids])
        return res

    def _get_type(self, cr, uid, context=None):
        if context is None:
            context = {}
        return context.get('type', False)

    def _get_period(self, cr, uid, context=None):
        if context is None: context = {}
        if context.get('period_id', False):
            return context.get('period_id')
        periods = self.pool.get('account.period').find(cr, uid)
        return periods and periods[0] or False

    def _make_journal_search(self, cr, uid, ttype, context=None):
        journal_pool = self.pool.get('account.journal')
        return journal_pool.search(cr, uid, [('type', '=', ttype)], limit=1)

    def _get_journal(self, cr, uid, context=None):
        if context is None: context = {}
        invoice_pool = self.pool.get('account.invoice')
        journal_pool = self.pool.get('account.journal')
        if context.get('invoice_id', False):
            currency_id = invoice_pool.browse(cr, uid, context['invoice_id'], context=context).currency_id.id
            journal_id = journal_pool.search(cr, uid, [('currency', '=', currency_id)], limit=1)
            return journal_id and journal_id[0] or False
        if context.get('journal_id', False):
            return context.get('journal_id')
        if not context.get('journal_id', False) and context.get('search_default_journal_id', False):
            return context.get('search_default_journal_id')

        ttype = context.get('type', 'bank')
        if ttype in ('payment', 'receipt'):
            ttype = 'bank'
        res = self._make_journal_search(cr, uid, ttype, context=context)
        return res and res[0] or False

    def _get_tax(self, cr, uid, context=None):
        if context is None: context = {}
        journal_pool = self.pool.get('account.journal')
        journal_id = context.get('journal_id', False)
        if not journal_id:
            ttype = context.get('type', 'bank')
            res = journal_pool.search(cr, uid, [('type', '=', ttype)], limit=1)
            if not res:
                return False
            journal_id = res[0]

        if not journal_id:
            return False
        journal = journal_pool.browse(cr, uid, journal_id, context=context)
        account_id = journal.default_credit_account_id or journal.default_debit_account_id
        if account_id and account_id.tax_ids:
            tax_id = account_id.tax_ids[0].id
            return tax_id
        return False

    def _get_payment_rate_currency(self, cr, uid, context=None):
        """
        Return the default value for field payment_rate_currency_id: the currency of the journal
        if there is one, otherwise the currency of the user's company
        """
        if context is None: context = {}
        journal_pool = self.pool.get('account.journal')
        journal_id = context.get('journal_id', False)
        if journal_id:
            journal = journal_pool.browse(cr, uid, journal_id, context=context)
            if journal.currency:
                return journal.currency.id
        #no journal given in the context, use company currency as default
        return self.pool.get('res.users').browse(cr, uid, uid, context=context).company_id.currency_id.id

    def _get_currency(self, cr, uid, context=None):
        if context is None: context = {}
        journal_pool = self.pool.get('account.journal')
        journal_id = context.get('journal_id', False)
        if journal_id:
            journal = journal_pool.browse(cr, uid, journal_id, context=context)
            if journal.currency:
                return journal.currency.id
        return False

    def _get_partner(self, cr, uid, context=None):
        if context is None: context = {}
        return context.get('partner_id', False)

    def _get_reference(self, cr, uid, context=None):
        if context is None: context = {}
        return context.get('reference', False)

    def _get_narration(self, cr, uid, context=None):
        if context is None: context = {}
        return context.get('narration', False)

    def _get_amount(self, cr, uid, context=None):
        if context is None:
            context= {}
        return context.get('amount', 0.0)

    def name_get(self, cr, uid, ids, context=None):
        if not ids:
            return []
        if context is None: context = {}
        return [(r['id'], (str("%.2f" % r['amount']) or '')) for r in self.read(cr, uid, ids, ['amount'], context, load='_classic_write')]

    def fields_view_get(self, cr, uid, view_id=None, view_type=False, context=None, toolbar=False, submenu=False):
        mod_obj = self.pool.get('ir.model.data')
        if context is None: context = {}

        if view_type == 'form':
            if not view_id and context.get('invoice_type'):
                if context.get('invoice_type') in ('out_invoice', 'out_refund'):
                    result = mod_obj.get_object_reference(cr, uid, 'account_voucher', 'view_vendor_receipt_form')
                else:
                    result = mod_obj.get_object_reference(cr, uid, 'account_voucher', 'view_vendor_payment_form')
                result = result and result[1] or False
                view_id = result
            if not view_id and context.get('line_type'):
                if context.get('line_type') == 'customer':
                    result = mod_obj.get_object_reference(cr, uid, 'account_voucher', 'view_vendor_receipt_form')
                else:
                    result = mod_obj.get_object_reference(cr, uid, 'account_voucher', 'view_vendor_payment_form')
                result = result and result[1] or False
                view_id = result

        res = super(account_voucher, self).fields_view_get(cr, uid, view_id=view_id, view_type=view_type, context=context, toolbar=toolbar, submenu=submenu)
        doc = etree.XML(res['arch'])

        if context.get('type', 'sale') in ('purchase', 'payment'):
            nodes = doc.xpath("//field[@name='partner_id']")
            for node in nodes:
                node.set('context', "{'search_default_supplier': 1}")
                if context.get('invoice_type','') in ('in_invoice', 'in_refund'):
                    node.set('string', _("Supplier"))
        res['arch'] = etree.tostring(doc)
        return res

    def _compute_writeoff_amount(self, cr, uid, line_dr_ids, line_cr_ids, amount, type):
        debit = credit = 0.0
        sign = type == 'payment' and -1 or 1
        for l in line_dr_ids:
            debit += l['amount']
        for l in line_cr_ids:
            credit += l['amount']
        return amount - sign * (credit - debit)

    def onchange_line_ids(self, cr, uid, ids, line_dr_ids, line_cr_ids, amount, voucher_currency, type, context=None):
        context = context or {}
        if not line_dr_ids and not line_cr_ids:
            return {'value':{}}
        line_osv = self.pool.get("account.voucher.line")
        line_dr_ids = resolve_o2m_operations(cr, uid, line_osv, line_dr_ids, ['amount'], context)
        line_cr_ids = resolve_o2m_operations(cr, uid, line_osv, line_cr_ids, ['amount'], context)

        #compute the field is_multi_currency that is used to hide/display options linked to secondary currency on the voucher
        is_multi_currency = False
        if voucher_currency:
            # if the voucher currency is not False, it means it is different than the company currency and we need to display the options
            is_multi_currency = True
        else:
            #loop on the voucher lines to see if one of these has a secondary currency. If yes, we need to define the options
            for voucher_line in line_dr_ids+line_cr_ids:
                company_currency = False
                company_currency = voucher_line.get('move_line_id', False) and self.pool.get('account.move.line').browse(cr, uid, voucher_line.get('move_line_id'), context=context).company_id.currency_id.id
                if voucher_line.get('currency_id', company_currency) != company_currency:
                    is_multi_currency = True
                    break
        return {'value': {'writeoff_amount': self._compute_writeoff_amount(cr, uid, line_dr_ids, line_cr_ids, amount, type), 'is_multi_currency': is_multi_currency}}

    def _get_writeoff_amount(self, cr, uid, ids, name, args, context=None):
        if not ids: return {}
        currency_obj = self.pool.get('res.currency')
        res = {}
        debit = credit = 0.0
        for voucher in self.browse(cr, uid, ids, context=context):
            sign = voucher.type == 'payment' and -1 or 1
            for l in voucher.line_dr_ids:
                debit += l.amount
            for l in voucher.line_cr_ids:
                credit += l.amount
            currency = voucher.currency_id or voucher.company_id.currency_id
            res[voucher.id] =  currency_obj.round(cr, uid, currency, voucher.amount - sign * (credit - debit))
        return res

    def _paid_amount_in_company_currency(self, cr, uid, ids, name, args, context=None):
        if not ids: return {}
        res = {}
        rate = 1.0
        for voucher in self.browse(cr, uid, ids, context=context):
            if voucher.currency_id:
                if voucher.company_id.currency_id.id == voucher.payment_rate_currency_id.id:
                    rate =  1 / voucher.payment_rate
                else:
                    ctx = context.copy()
                    ctx.update({'date': voucher.date})
                    voucher_rate = self.browse(cr, uid, voucher.id, context=ctx).currency_id.rate
                    company_currency_rate = voucher.company_id.currency_id.rate
                    rate = voucher_rate * company_currency_rate
            res[voucher.id] =  voucher.amount / rate
        return res

    _name = 'account.voucher'
    _description = 'Accounting Voucher'
    _inherit = ['mail.thread']
    _order = "date desc, id desc"
#    _rec_name = 'number'
    _track = {
        'state': {
            'account_voucher.mt_voucher_state_change': lambda self, cr, uid, obj, ctx=None: True,
        },
    }

    _columns = {
        'active': fields.boolean('Active', help="By default, reconciliation vouchers made on draft bank statements are set as inactive, which allow to hide the customer/supplier payment while the bank statement isn't confirmed."),
        'type':fields.selection([
            ('sale','Sale'),
            ('purchase','Purchase'),
            ('payment','Payment'),
            ('receipt','Receipt'),
        ],'Default Type', readonly=True, states={'draft':[('readonly',False)]}),
        'name':fields.char('Memo', size=256, readonly=True, states={'draft':[('readonly',False)]}),
        'date':fields.date('Date', readonly=True, select=True, states={'draft':[('readonly',False)]}, help="Effective date for accounting entries"),
        'journal_id':fields.many2one('account.journal', 'Journal', required=True, readonly=True, states={'draft':[('readonly',False)]}),
        'account_id':fields.many2one('account.account', 'Account', required=True, readonly=True, states={'draft':[('readonly',False)]}),
        'line_ids':fields.one2many('account.voucher.line','voucher_id','Voucher Lines', readonly=True, states={'draft':[('readonly',False)]}),
        'line_cr_ids':fields.one2many('account.voucher.line','voucher_id','Credits',
            domain=[('type','=','cr')], context={'default_type':'cr'}, readonly=True, states={'draft':[('readonly',False)]}),
        'line_dr_ids':fields.one2many('account.voucher.line','voucher_id','Debits',
            domain=[('type','=','dr')], context={'default_type':'dr'}, readonly=True, states={'draft':[('readonly',False)]}),
        'period_id': fields.many2one('account.period', 'Period', required=True, readonly=True, states={'draft':[('readonly',False)]}),
        'narration':fields.text('Notes', readonly=True, states={'draft':[('readonly',False)]}),
#        'currency_id':fields.many2one('res.currency', 'Currency', required=True, readonly=True, states={'draft':[('readonly',False)]}),
        'currency_id': fields.related('journal_id','currency', type='many2one', relation='res.currency', string='Currency', readonly=True),
        'company_id': fields.many2one('res.company', 'Company', required=True, readonly=True, states={'draft':[('readonly',False)]}),
        'state':fields.selection(
            [('draft','Draft'),
             ('cancel','Cancelled'),
             ('proforma','Pro-forma'),
             ('posted','Posted')
            ], 'Status', readonly=True, size=32, track_visibility='onchange',
            help=' * The \'Draft\' status is used when a user is encoding a new and unconfirmed Voucher. \
                        \n* The \'Pro-forma\' when voucher is in Pro-forma status,voucher does not have an voucher number. \
                        \n* The \'Posted\' status is used when user create voucher,a voucher number is generated and voucher entries are created in account \
                        \n* The \'Cancelled\' status is used when user cancel voucher.'),
        'amount': fields.float('Total', digits_compute=dp.get_precision('Account'), required=True, readonly=True, states={'draft':[('readonly',False)]}),
        'tax_amount':fields.float('Tax Amount', digits_compute=dp.get_precision('Account'), readonly=True, states={'draft':[('readonly',False)]}),
        'reference': fields.char('Ref #', size=64, readonly=True, states={'draft':[('readonly',False)]}, help="Transaction reference number."),
        'number': fields.char('Number', size=32, readonly=True,),
        'move_id':fields.many2one('account.move', 'Account Entry'),
        'move_ids': fields.related('move_id','line_id', type='one2many', relation='account.move.line', string='Journal Items', readonly=True),
        'partner_id':fields.many2one('res.partner', 'Partner', change_default=1, readonly=True, states={'draft':[('readonly',False)]}),
        'audit': fields.related('move_id','to_check', type='boolean', help='Check this box if you are unsure of that journal entry and if you want to note it as \'to be reviewed\' by an accounting expert.', relation='account.move', string='To Review'),
        'paid': fields.function(_check_paid, string='Paid', type='boolean', help="The Voucher has been totally paid."),
        'pay_now':fields.selection([
            ('pay_now','Pay Directly'),
            ('pay_later','Pay Later or Group Funds'),
        ],'Payment', select=True, readonly=True, states={'draft':[('readonly',False)]}),
        'tax_id': fields.many2one('account.tax', 'Tax', readonly=True, states={'draft':[('readonly',False)]}, domain=[('price_include','=', False)], help="Only for tax excluded from price"),
        'pre_line':fields.boolean('Previous Payments ?', required=False),
        'date_due': fields.date('Due Date', readonly=True, select=True, states={'draft':[('readonly',False)]}),
        'payment_option':fields.selection([
                                           ('without_writeoff', 'Keep Open'),
                                           ('with_writeoff', 'Reconcile Payment Balance'),
                                           ], 'Payment Difference', required=True, readonly=True, states={'draft': [('readonly', False)]}, help="This field helps you to choose what you want to do with the eventual difference between the paid amount and the sum of allocated amounts. You can either choose to keep open this difference on the partner's account, or reconcile it with the payment(s)"),
        'writeoff_acc_id': fields.many2one('account.account', 'Counterpart Account', readonly=True, states={'draft': [('readonly', False)]}),
        'comment': fields.char('Counterpart Comment', size=64, required=True, readonly=True, states={'draft': [('readonly', False)]}),
        'analytic_id': fields.many2one('account.analytic.account','Write-Off Analytic Account', readonly=True, states={'draft': [('readonly', False)]}),
        'writeoff_amount': fields.function(_get_writeoff_amount, string='Difference Amount', type='float', readonly=True, help="Computed as the difference between the amount stated in the voucher and the sum of allocation on the voucher lines."),
        'payment_rate_currency_id': fields.many2one('res.currency', 'Payment Rate Currency', required=True, readonly=True, states={'draft':[('readonly',False)]}),
        'payment_rate': fields.float('Exchange Rate', digits=(12,6), required=True, readonly=True, states={'draft': [('readonly', False)]},
            help='The specific rate that will be used, in this voucher, between the selected currency (in \'Payment Rate Currency\' field)  and the voucher currency.'),
        'paid_amount_in_company_currency': fields.function(_paid_amount_in_company_currency, string='Paid Amount in Company Currency', type='float', readonly=True),
        'is_multi_currency': fields.boolean('Multi Currency Voucher', help='Fields with internal purpose only that depicts if the voucher is a multi currency one or not'),
    }
    _defaults = {
        'active': True,
        'period_id': _get_period,
        'partner_id': _get_partner,
        'journal_id':_get_journal,
        'currency_id': _get_currency,
        'reference': _get_reference,
        'narration':_get_narration,
        'amount': _get_amount,
        'type':_get_type,
        'state': 'draft',
        'pay_now': 'pay_now',
        'name': '',
        'date': lambda *a: time.strftime('%Y-%m-%d'),
        'company_id': lambda self,cr,uid,c: self.pool.get('res.company')._company_default_get(cr, uid, 'account.voucher',context=c),
        'tax_id': _get_tax,
        'payment_option': 'without_writeoff',
        'comment': _('Write-Off'),
        'payment_rate': 1.0,
        'payment_rate_currency_id': _get_payment_rate_currency,
    }

    def compute_tax(self, cr, uid, ids, context=None):
        tax_pool = self.pool.get('account.tax')
        partner_pool = self.pool.get('res.partner')
        position_pool = self.pool.get('account.fiscal.position')
        voucher_line_pool = self.pool.get('account.voucher.line')
        voucher_pool = self.pool.get('account.voucher')
        if context is None: context = {}

        for voucher in voucher_pool.browse(cr, uid, ids, context=context):
            voucher_amount = 0.0
            for line in voucher.line_ids:
                voucher_amount += line.untax_amount or line.amount
                line.amount = line.untax_amount or line.amount
                voucher_line_pool.write(cr, uid, [line.id], {'amount':line.amount, 'untax_amount':line.untax_amount})

            if not voucher.tax_id:
                self.write(cr, uid, [voucher.id], {'amount':voucher_amount, 'tax_amount':0.0})
                continue

            tax = [tax_pool.browse(cr, uid, voucher.tax_id.id, context=context)]
            partner = partner_pool.browse(cr, uid, voucher.partner_id.id, context=context) or False
            taxes = position_pool.map_tax(cr, uid, partner and partner.property_account_position or False, tax)
            tax = tax_pool.browse(cr, uid, taxes, context=context)

            total = voucher_amount
            total_tax = 0.0

            if not tax[0].price_include:
                for line in voucher.line_ids:
                    for tax_line in tax_pool.compute_all(cr, uid, tax, line.amount, 1).get('taxes', []):
                        total_tax += tax_line.get('amount', 0.0)
                total += total_tax
            else:
                for line in voucher.line_ids:
                    line_total = 0.0
                    line_tax = 0.0

                    for tax_line in tax_pool.compute_all(cr, uid, tax, line.untax_amount or line.amount, 1).get('taxes', []):
                        line_tax += tax_line.get('amount', 0.0)
                        line_total += tax_line.get('price_unit')
                    total_tax += line_tax
                    untax_amount = line.untax_amount or line.amount
                    voucher_line_pool.write(cr, uid, [line.id], {'amount':line_total, 'untax_amount':untax_amount})

            self.write(cr, uid, [voucher.id], {'amount':total, 'tax_amount':total_tax})
        return True

    def onchange_price(self, cr, uid, ids, line_ids, tax_id, partner_id=False, context=None):
        context = context or {}
        tax_pool = self.pool.get('account.tax')
        partner_pool = self.pool.get('res.partner')
        position_pool = self.pool.get('account.fiscal.position')
        line_pool = self.pool.get('account.voucher.line')
        res = {
            'tax_amount': False,
            'amount': False,
        }
        voucher_total = 0.0

        line_ids = resolve_o2m_operations(cr, uid, line_pool, line_ids, ["amount"], context)

        total_tax = 0.0
        for line in line_ids:
            line_amount = 0.0
            line_amount = line.get('amount',0.0)

            if tax_id:
                tax = [tax_pool.browse(cr, uid, tax_id, context=context)]
                if partner_id:
                    partner = partner_pool.browse(cr, uid, partner_id, context=context) or False
                    taxes = position_pool.map_tax(cr, uid, partner and partner.property_account_position or False, tax)
                    tax = tax_pool.browse(cr, uid, taxes, context=context)

                if not tax[0].price_include:
                    for tax_line in tax_pool.compute_all(cr, uid, tax, line_amount, 1).get('taxes', []):
                        total_tax += tax_line.get('amount')

            voucher_total += line_amount
        total = voucher_total + total_tax

        res.update({
            'amount': total or voucher_total,
            'tax_amount': total_tax
        })
        return {
            'value': res
        }

    def onchange_term_id(self, cr, uid, ids, term_id, amount):
        term_pool = self.pool.get('account.payment.term')
        terms = False
        due_date = False
        default = {'date_due':False}
        if term_id and amount:
            terms = term_pool.compute(cr, uid, term_id, amount)
        if terms:
            due_date = terms[-1][0]
            default.update({
                'date_due':due_date
            })
        return {'value':default}

    def onchange_journal_voucher(self, cr, uid, ids, line_ids=False, tax_id=False, price=0.0, partner_id=False, journal_id=False, ttype=False, company_id=False, context=None):
        """price
        Returns a dict that contains new values and context

        @param partner_id: latest value from user input for field partner_id
        @param args: other arguments
        @param context: context arguments, like lang, time zone

        @return: Returns a dict which contains new values, and context
        """
        default = {
            'value':{},
        }

        if not partner_id or not journal_id:
            return default

        partner_pool = self.pool.get('res.partner')
        journal_pool = self.pool.get('account.journal')

        journal = journal_pool.browse(cr, uid, journal_id, context=context)
        partner = partner_pool.browse(cr, uid, partner_id, context=context)
        account_id = False
        tr_type = False
        if journal.type in ('sale','sale_refund'):
            account_id = partner.property_account_receivable.id
            tr_type = 'sale'
        elif journal.type in ('purchase', 'purchase_refund','expense'):
            account_id = partner.property_account_payable.id
            tr_type = 'purchase'
        else:
            if not journal.default_credit_account_id or not journal.default_debit_account_id:
                raise osv.except_osv(_('Error!'), _('Please define default credit/debit accounts on the journal "%s".') % (journal.name))
            account_id = journal.default_credit_account_id.id or journal.default_debit_account_id.id
            tr_type = 'receipt'

        default['value']['account_id'] = account_id
        default['value']['type'] = ttype or tr_type

        vals = self.onchange_journal(cr, uid, ids, journal_id, line_ids, tax_id, partner_id, time.strftime('%Y-%m-%d'), price, ttype, company_id, context)
        default['value'].update(vals.get('value'))

        return default

    def onchange_rate(self, cr, uid, ids, rate, amount, currency_id, payment_rate_currency_id, company_id, context=None):
        res =  {'value': {'paid_amount_in_company_currency': amount}}
        company_currency = self.pool.get('res.company').browse(cr, uid, company_id, context=context).currency_id
        if rate and amount and currency_id:# and currency_id == payment_rate_currency_id:
            voucher_rate = self.pool.get('res.currency').browse(cr, uid, currency_id, context).rate
            if company_currency.id == payment_rate_currency_id:
                company_rate = rate
            else:
                company_rate = self.pool.get('res.company').browse(cr, uid, company_id, context=context).currency_id.rate
            res['value']['paid_amount_in_company_currency'] = amount / voucher_rate * company_rate
        return res

    def onchange_amount(self, cr, uid, ids, amount, rate, partner_id, journal_id, currency_id, ttype, date, payment_rate_currency_id, company_id, context=None):
        if context is None:
            context = {}
        res = self.recompute_voucher_lines(cr, uid, ids, partner_id, journal_id, amount, currency_id, ttype, date, context=context)
        ctx = context.copy()
        ctx.update({'date': date})
        vals = self.onchange_rate(cr, uid, ids, rate, amount, currency_id, payment_rate_currency_id, company_id, context=ctx)
        for key in vals.keys():
            res[key].update(vals[key])
        return res

    def recompute_payment_rate(self, cr, uid, ids, vals, currency_id, date, ttype, journal_id, amount, context=None):
        if context is None:
            context = {}
        #on change of the journal, we need to set also the default value for payment_rate and payment_rate_currency_id
        currency_obj = self.pool.get('res.currency')
        journal = self.pool.get('account.journal').browse(cr, uid, journal_id, context=context)
        company_id = journal.company_id.id
        payment_rate = 1.0
        payment_rate_currency_id = currency_id
        ctx = context.copy()
        ctx.update({'date': date})
        o2m_to_loop = False
        if ttype == 'receipt':
            o2m_to_loop = 'line_cr_ids'
        elif ttype == 'payment':
            o2m_to_loop = 'line_dr_ids'
        if o2m_to_loop and 'value' in vals and o2m_to_loop in vals['value']:
            for voucher_line in vals['value'][o2m_to_loop]:
                if voucher_line['currency_id'] != currency_id:
                    # we take as default value for the payment_rate_currency_id, the currency of the first invoice that
                    # is not in the voucher currency
                    payment_rate_currency_id = voucher_line['currency_id']
                    tmp = currency_obj.browse(cr, uid, payment_rate_currency_id, context=ctx).rate
                    voucher_currency_id = currency_id or journal.company_id.currency_id.id
                    payment_rate = tmp / currency_obj.browse(cr, uid, voucher_currency_id, context=ctx).rate
                    break
        res = self.onchange_rate(cr, uid, ids, payment_rate, amount, currency_id, payment_rate_currency_id, company_id, context=ctx)
        for key in res.keys():
            vals[key].update(res[key])
        vals['value'].update({'payment_rate': payment_rate})
        if payment_rate_currency_id:
            vals['value'].update({'payment_rate_currency_id': payment_rate_currency_id})
        return vals

    def onchange_partner_id(self, cr, uid, ids, partner_id, journal_id, amount, currency_id, ttype, date, context=None):
        if not journal_id:
            return {}
        res = self.recompute_voucher_lines(cr, uid, ids, partner_id, journal_id, amount, currency_id, ttype, date, context=context)
        vals = self.recompute_payment_rate(cr, uid, ids, res, currency_id, date, ttype, journal_id, amount, context=context)
        for key in vals.keys():
            res[key].update(vals[key])
        #TODO: onchange_partner_id() should not returns [pre_line, line_dr_ids, payment_rate...] for type sale, and not 
        # [pre_line, line_cr_ids, payment_rate...] for type purchase.
        # We should definitively split account.voucher object in two and make distinct on_change functions. In the 
        # meanwhile, bellow lines must be there because the fields aren't present in the view, what crashes if the 
        # onchange returns a value for them
        if ttype == 'sale':
            del(res['value']['line_dr_ids'])
            del(res['value']['pre_line'])
            del(res['value']['payment_rate'])
        elif ttype == 'purchase':
            del(res['value']['line_cr_ids'])
            del(res['value']['pre_line'])
            del(res['value']['payment_rate'])
        return res

    def recompute_voucher_lines(self, cr, uid, ids, partner_id, journal_id, price, currency_id, ttype, date, context=None):
        """
        Returns a dict that contains new values and context

        @param partner_id: latest value from user input for field partner_id
        @param args: other arguments
        @param context: context arguments, like lang, time zone

        @return: Returns a dict which contains new values, and context
        """
        def _remove_noise_in_o2m():
            """if the line is partially reconciled, then we must pay attention to display it only once and
                in the good o2m.
                This function returns True if the line is considered as noise and should not be displayed
            """
            if line.reconcile_partial_id:
                if currency_id == line.currency_id.id:
                    if line.amount_residual_currency <= 0:
                        return True
                else:
                    if line.amount_residual <= 0:
                        return True
            return False

        if context is None:
            context = {}
        context_multi_currency = context.copy()
        if date:
            context_multi_currency.update({'date': date})

        currency_pool = self.pool.get('res.currency')
        move_line_pool = self.pool.get('account.move.line')
        partner_pool = self.pool.get('res.partner')
        journal_pool = self.pool.get('account.journal')
        line_pool = self.pool.get('account.voucher.line')

        #set default values
        default = {
            'value': {'line_dr_ids': [] ,'line_cr_ids': [] ,'pre_line': False,},
        }

        #drop existing lines
        line_ids = ids and line_pool.search(cr, uid, [('voucher_id', '=', ids[0])]) or False
        if line_ids:
            line_pool.unlink(cr, uid, line_ids)

        if not partner_id or not journal_id:
            return default

        journal = journal_pool.browse(cr, uid, journal_id, context=context)
        partner = partner_pool.browse(cr, uid, partner_id, context=context)
        currency_id = currency_id or journal.company_id.currency_id.id
        account_id = False
        if journal.type in ('sale','sale_refund'):
            account_id = partner.property_account_receivable.id
        elif journal.type in ('purchase', 'purchase_refund','expense'):
            account_id = partner.property_account_payable.id
        else:
            account_id = journal.default_credit_account_id.id or journal.default_debit_account_id.id

        default['value']['account_id'] = account_id

        if journal.type not in ('cash', 'bank'):
            return default

        total_credit = 0.0
        total_debit = 0.0
        account_type = 'receivable'
        if ttype == 'payment':
            account_type = 'payable'
            total_debit = price or 0.0
        else:
            total_credit = price or 0.0
            account_type = 'receivable'

        if not context.get('move_line_ids', False):
            ids = move_line_pool.search(cr, uid, [('state','=','valid'), ('account_id.type', '=', account_type), ('reconcile_id', '=', False), ('partner_id', '=', partner_id)], context=context)
        else:
            ids = context['move_line_ids']
        invoice_id = context.get('invoice_id', False)
        company_currency = journal.company_id.currency_id.id
        move_line_found = False

        #order the lines by most old first
        ids.reverse()
        account_move_lines = move_line_pool.browse(cr, uid, ids, context=context)

        #compute the total debit/credit and look for a matching open amount or invoice
        for line in account_move_lines:
            if _remove_noise_in_o2m():
                continue

            if invoice_id:
                if line.invoice.id == invoice_id:
                    #if the invoice linked to the voucher line is equal to the invoice_id in context
                    #then we assign the amount on that line, whatever the other voucher lines
                    move_line_found = line.id
                    break
            elif currency_id == company_currency:
                #otherwise treatments is the same but with other field names
                if line.amount_residual == price:
                    #if the amount residual is equal the amount voucher, we assign it to that voucher
                    #line, whatever the other voucher lines
                    move_line_found = line.id
                    break
                #otherwise we will split the voucher amount on each line (by most old first)
                total_credit += line.credit or 0.0
                total_debit += line.debit or 0.0
            elif currency_id == line.currency_id.id:
                if line.amount_residual_currency == price:
                    move_line_found = line.id
                    break
                total_credit += line.credit and line.amount_currency or 0.0
                total_debit += line.debit and line.amount_currency or 0.0

        #voucher line creation
        for line in account_move_lines:

            if _remove_noise_in_o2m():
                continue

            if line.currency_id and currency_id==line.currency_id.id:
                amount_original = abs(line.amount_currency)
                amount_unreconciled = abs(line.amount_residual_currency)
            else:
                amount_original = currency_pool.compute(cr, uid, company_currency, currency_id, line.credit or line.debit or 0.0)
                amount_unreconciled = currency_pool.compute(cr, uid, company_currency, currency_id, abs(line.amount_residual))
            line_currency_id = line.currency_id and line.currency_id.id or company_currency
            rs = {
                'name':line.move_id.name,
                'type': line.credit and 'dr' or 'cr',
                'move_line_id':line.id,
                'account_id':line.account_id.id,
                'amount_original': amount_original,
                'amount': (move_line_found == line.id) and min(abs(price), amount_unreconciled) or 0.0,
                'date_original':line.date,
                'date_due':line.date_maturity,
                'amount_unreconciled': amount_unreconciled,
                'currency_id': line_currency_id,
            }
            #in case a corresponding move_line hasn't been found, we now try to assign the voucher amount
            #on existing invoices: we split voucher amount by most old first, but only for lines in the same currency
            if not move_line_found:
                if currency_id == line_currency_id:
                    if line.credit:
                        amount = min(amount_unreconciled, abs(total_debit))
                        rs['amount'] = amount
                        total_debit -= amount
                    else:
                        amount = min(amount_unreconciled, abs(total_credit))
                        rs['amount'] = amount
                        total_credit -= amount

            if rs['amount_unreconciled'] == rs['amount']:
                rs['reconcile'] = True

            if rs['type'] == 'cr':
                default['value']['line_cr_ids'].append(rs)
            else:
                default['value']['line_dr_ids'].append(rs)

            if ttype == 'payment' and len(default['value']['line_cr_ids']) > 0:
                default['value']['pre_line'] = 1
            elif ttype == 'receipt' and len(default['value']['line_dr_ids']) > 0:
                default['value']['pre_line'] = 1
            default['value']['writeoff_amount'] = self._compute_writeoff_amount(cr, uid, default['value']['line_dr_ids'], default['value']['line_cr_ids'], price, ttype)
        return default

    def onchange_payment_rate_currency(self, cr, uid, ids, currency_id, payment_rate, payment_rate_currency_id, date, amount, company_id, context=None):
        if context is None:
            context = {}
        res = {'value': {}}
        #set the default payment rate of the voucher and compute the paid amount in company currency
        if currency_id and currency_id == payment_rate_currency_id:
            ctx = context.copy()
            ctx.update({'date': date})
            vals = self.onchange_rate(cr, uid, ids, payment_rate, amount, currency_id, payment_rate_currency_id, company_id, context=ctx)
            for key in vals.keys():
                res[key].update(vals[key])
        return res

    def onchange_date(self, cr, uid, ids, date, currency_id, payment_rate_currency_id, amount, company_id, context=None):
        """
        @param date: latest value from user input for field date
        @param args: other arguments
        @param context: context arguments, like lang, time zone
        @return: Returns a dict which contains new values, and context
        """
        if context is None:
            context ={}
        res = {'value': {}}
        #set the period of the voucher
        period_pool = self.pool.get('account.period')
        currency_obj = self.pool.get('res.currency')
        ctx = context.copy()
        ctx.update({'company_id': company_id})
        pids = period_pool.find(cr, uid, date, context=ctx)
        if pids:
            res['value'].update({'period_id':pids[0]})
        if payment_rate_currency_id:
            ctx.update({'date': date})
            payment_rate = 1.0
            if payment_rate_currency_id != currency_id:
                tmp = currency_obj.browse(cr, uid, payment_rate_currency_id, context=ctx).rate
                voucher_currency_id = currency_id or self.pool.get('res.company').browse(cr, uid, company_id, context=ctx).currency_id.id
                payment_rate = tmp / currency_obj.browse(cr, uid, voucher_currency_id, context=ctx).rate
            vals = self.onchange_payment_rate_currency(cr, uid, ids, currency_id, payment_rate, payment_rate_currency_id, date, amount, company_id, context=context)
            vals['value'].update({'payment_rate': payment_rate})
            for key in vals.keys():
                res[key].update(vals[key])
        return res

    def onchange_journal(self, cr, uid, ids, journal_id, line_ids, tax_id, partner_id, date, amount, ttype, company_id, context=None):
        if not journal_id:
            return False
        journal_pool = self.pool.get('account.journal')
        journal = journal_pool.browse(cr, uid, journal_id, context=context)
        account_id = journal.default_credit_account_id or journal.default_debit_account_id
        tax_id = False
        if account_id and account_id.tax_ids:
            tax_id = account_id.tax_ids[0].id

        vals = {'value':{} }
        if ttype in ('sale', 'purchase'):
            vals = self.onchange_price(cr, uid, ids, line_ids, tax_id, partner_id, context)
            vals['value'].update({'tax_id':tax_id,'amount': amount})
        currency_id = False
        if journal.currency:
            currency_id = journal.currency.id
        vals['value'].update({'currency_id': currency_id})
        res = self.onchange_partner_id(cr, uid, ids, partner_id, journal_id, amount, currency_id, ttype, date, context)
        for key in res.keys():
            vals[key].update(res[key])
        return vals

    def button_proforma_voucher(self, cr, uid, ids, context=None):
        context = context or {}
        wf_service = netsvc.LocalService("workflow")
        for vid in ids:
            wf_service.trg_validate(uid, 'account.voucher', vid, 'proforma_voucher', cr)
        return {'type': 'ir.actions.act_window_close'}

    def proforma_voucher(self, cr, uid, ids, context=None):
        self.action_move_line_create(cr, uid, ids, context=context)
        return True

    def action_cancel_draft(self, cr, uid, ids, context=None):
        wf_service = netsvc.LocalService("workflow")
        for voucher_id in ids:
            wf_service.trg_create(uid, 'account.voucher', voucher_id, cr)
        self.write(cr, uid, ids, {'state':'draft'})
        return True

    def cancel_voucher(self, cr, uid, ids, context=None):
        reconcile_pool = self.pool.get('account.move.reconcile')
        move_pool = self.pool.get('account.move')

        for voucher in self.browse(cr, uid, ids, context=context):
            recs = []
            for line in voucher.move_ids:
                if line.reconcile_id:
                    recs += [line.reconcile_id.id]
                if line.reconcile_partial_id:
                    recs += [line.reconcile_partial_id.id]

            reconcile_pool.unlink(cr, uid, recs)

            if voucher.move_id:
                move_pool.button_cancel(cr, uid, [voucher.move_id.id])
                move_pool.unlink(cr, uid, [voucher.move_id.id])
        res = {
            'state':'cancel',
            'move_id':False,
        }
        self.write(cr, uid, ids, res)
        return True

    def unlink(self, cr, uid, ids, context=None):
        for t in self.read(cr, uid, ids, ['state'], context=context):
            if t['state'] not in ('draft', 'cancel'):
                raise osv.except_osv(_('Invalid Action!'), _('Cannot delete voucher(s) which are already opened or paid.'))
        return super(account_voucher, self).unlink(cr, uid, ids, context=context)

    def onchange_payment(self, cr, uid, ids, pay_now, journal_id, partner_id, ttype='sale'):
        res = {}
        if not partner_id:
            return res
        res = {'account_id':False}
        partner_pool = self.pool.get('res.partner')
        journal_pool = self.pool.get('account.journal')
        if pay_now == 'pay_later':
            partner = partner_pool.browse(cr, uid, partner_id)
            journal = journal_pool.browse(cr, uid, journal_id)
            if journal.type in ('sale','sale_refund'):
                account_id = partner.property_account_receivable.id
            elif journal.type in ('purchase', 'purchase_refund','expense'):
                account_id = partner.property_account_payable.id
            else:
                account_id = journal.default_credit_account_id.id or journal.default_debit_account_id.id
            res['account_id'] = account_id
        return {'value':res}

    def _sel_context(self, cr, uid, voucher_id, context=None):
        """
        Select the context to use accordingly if it needs to be multicurrency or not.

        :param voucher_id: Id of the actual voucher
        :return: The returned context will be the same as given in parameter if the voucher currency is the same
                 than the company currency, otherwise it's a copy of the parameter with an extra key 'date' containing
                 the date of the voucher.
        :rtype: dict
        """
        company_currency = self._get_company_currency(cr, uid, voucher_id, context)
        current_currency = self._get_current_currency(cr, uid, voucher_id, context)
        if current_currency <> company_currency:
            context_multi_currency = context.copy()
            voucher_brw = self.pool.get('account.voucher').browse(cr, uid, voucher_id, context)
            context_multi_currency.update({'date': voucher_brw.date})
            return context_multi_currency
        return context

    def first_move_line_get(self, cr, uid, voucher_id, move_id, company_currency, current_currency, context=None):
        '''
        Return a dict to be use to create the first account move line of given voucher.

        :param voucher_id: Id of voucher what we are creating account_move.
        :param move_id: Id of account move where this line will be added.
        :param company_currency: id of currency of the company to which the voucher belong
        :param current_currency: id of currency of the voucher
        :return: mapping between fieldname and value of account move line to create
        :rtype: dict
        '''
        voucher_brw = self.pool.get('account.voucher').browse(cr,uid,voucher_id,context)
        debit = credit = 0.0
        # TODO: is there any other alternative then the voucher type ??
        # ANSWER: We can have payment and receipt "In Advance".
        # TODO: Make this logic available.
        # -for sale, purchase we have but for the payment and receipt we do not have as based on the bank/cash journal we can not know its payment or receipt
        if voucher_brw.type in ('purchase', 'payment'):
            credit = voucher_brw.paid_amount_in_company_currency
        elif voucher_brw.type in ('sale', 'receipt'):
            debit = voucher_brw.paid_amount_in_company_currency
        if debit < 0: credit = -debit; debit = 0.0
        if credit < 0: debit = -credit; credit = 0.0
        sign = debit - credit < 0 and -1 or 1
        #set the first line of the voucher
        move_line = {
                'name': voucher_brw.name or '/',
                'debit': debit,
                'credit': credit,
                'account_id': voucher_brw.account_id.id,
                'move_id': move_id,
                'journal_id': voucher_brw.journal_id.id,
                'period_id': voucher_brw.period_id.id,
                'partner_id': voucher_brw.partner_id.id,
                'currency_id': company_currency <> current_currency and  current_currency or False,
                'amount_currency': company_currency <> current_currency and sign * voucher_brw.amount or 0.0,
                'date': voucher_brw.date,
                'date_maturity': voucher_brw.date_due
            }
        return move_line

    def account_move_get(self, cr, uid, voucher_id, context=None):
        '''
        This method prepare the creation of the account move related to the given voucher.

        :param voucher_id: Id of voucher for which we are creating account_move.
        :return: mapping between fieldname and value of account move to create
        :rtype: dict
        '''
        seq_obj = self.pool.get('ir.sequence')
        voucher_brw = self.pool.get('account.voucher').browse(cr,uid,voucher_id,context)
        if voucher_brw.number:
            name = voucher_brw.number
        elif voucher_brw.journal_id.sequence_id:
            if not voucher_brw.journal_id.sequence_id.active:
                raise osv.except_osv(_('Configuration Error !'),
                    _('Please activate the sequence of selected journal !'))
            name = seq_obj.next_by_id(cr, uid, voucher_brw.journal_id.sequence_id.id, context=context)
        else:
            raise osv.except_osv(_('Error!'),
                        _('Please define a sequence on the journal.'))
        if not voucher_brw.reference:
            ref = name.replace('/','')
        else:
            ref = voucher_brw.reference

        move = {
            'name': name,
            'journal_id': voucher_brw.journal_id.id,
            'narration': voucher_brw.narration,
            'date': voucher_brw.date,
            'ref': ref,
            'period_id': voucher_brw.period_id and voucher_brw.period_id.id or False
        }
        return move

    def _get_exchange_lines(self, cr, uid, line, move_id, amount_residual, company_currency, current_currency, context=None):
        '''
        Prepare the two lines in company currency due to currency rate difference.

        :param line: browse record of the voucher.line for which we want to create currency rate difference accounting
            entries
        :param move_id: Account move wher the move lines will be.
        :param amount_residual: Amount to be posted.
        :param company_currency: id of currency of the company to which the voucher belong
        :param current_currency: id of currency of the voucher
        :return: the account move line and its counterpart to create, depicted as mapping between fieldname and value
        :rtype: tuple of dict
        '''
        if amount_residual > 0:
            account_id = line.voucher_id.company_id.expense_currency_exchange_account_id
            if not account_id:
                raise osv.except_osv(_('Insufficient Configuration!'),_("You should configure the 'Loss Exchange Rate Account' in the accounting settings, to manage automatically the booking of accounting entries related to differences between exchange rates."))
        else:
            account_id = line.voucher_id.company_id.income_currency_exchange_account_id
            if not account_id:
                raise osv.except_osv(_('Insufficient Configuration!'),_("You should configure the 'Gain Exchange Rate Account' in the accounting settings, to manage automatically the booking of accounting entries related to differences between exchange rates."))
        # Even if the amount_currency is never filled, we need to pass the foreign currency because otherwise
        # the receivable/payable account may have a secondary currency, which render this field mandatory
        account_currency_id = company_currency <> current_currency and current_currency or False
        move_line = {
            'journal_id': line.voucher_id.journal_id.id,
            'period_id': line.voucher_id.period_id.id,
            'name': _('change')+': '+(line.name or '/'),
            'account_id': line.account_id.id,
            'move_id': move_id,
            'partner_id': line.voucher_id.partner_id.id,
            'currency_id': account_currency_id,
            'amount_currency': 0.0,
            'quantity': 1,
            'credit': amount_residual > 0 and amount_residual or 0.0,
            'debit': amount_residual < 0 and -amount_residual or 0.0,
            'date': line.voucher_id.date,
        }
        move_line_counterpart = {
            'journal_id': line.voucher_id.journal_id.id,
            'period_id': line.voucher_id.period_id.id,
            'name': _('change')+': '+(line.name or '/'),
            'account_id': account_id.id,
            'move_id': move_id,
            'amount_currency': 0.0,
            'partner_id': line.voucher_id.partner_id.id,
            'currency_id': account_currency_id,
            'quantity': 1,
            'debit': amount_residual > 0 and amount_residual or 0.0,
            'credit': amount_residual < 0 and -amount_residual or 0.0,
            'date': line.voucher_id.date,
        }
        return (move_line, move_line_counterpart)

    def _convert_amount(self, cr, uid, amount, voucher_id, context=None):
        '''
        This function convert the amount given in company currency. It takes either the rate in the voucher (if the
        payment_rate_currency_id is relevant) either the rate encoded in the system.

        :param amount: float. The amount to convert
        :param voucher: id of the voucher on which we want the conversion
        :param context: to context to use for the conversion. It may contain the key 'date' set to the voucher date
            field in order to select the good rate to use.
        :return: the amount in the currency of the voucher's company
        :rtype: float
        '''
        currency_obj = self.pool.get('res.currency')
        voucher = self.browse(cr, uid, voucher_id, context=context)
        res = amount
        if voucher.payment_rate_currency_id.id == voucher.company_id.currency_id.id:
            # the rate specified on the voucher is for the company currency
            res = currency_obj.round(cr, uid, voucher.company_id.currency_id, (amount * voucher.payment_rate))
        else:
            # the rate specified on the voucher is not relevant, we use all the rates in the system
            res = currency_obj.compute(cr, uid, voucher.currency_id.id, voucher.company_id.currency_id.id, amount, context=context)
        return res

    def voucher_move_line_create(self, cr, uid, voucher_id, line_total, move_id, company_currency, current_currency, context=None):
        '''
        Create one account move line, on the given account move, per voucher line where amount is not 0.0.
        It returns Tuple with tot_line what is total of difference between debit and credit and
        a list of lists with ids to be reconciled with this format (total_deb_cred,list_of_lists).

        :param voucher_id: Voucher id what we are working with
        :param line_total: Amount of the first line, which correspond to the amount we should totally split among all voucher lines.
        :param move_id: Account move wher those lines will be joined.
        :param company_currency: id of currency of the company to which the voucher belong
        :param current_currency: id of currency of the voucher
        :return: Tuple build as (remaining amount not allocated on voucher lines, list of account_move_line created in this method)
        :rtype: tuple(float, list of int)
        '''
        if context is None:
            context = {}
        move_line_obj = self.pool.get('account.move.line')
        currency_obj = self.pool.get('res.currency')
        tax_obj = self.pool.get('account.tax')
        tot_line = line_total
        rec_lst_ids = []

        voucher_brw = self.pool.get('account.voucher').browse(cr, uid, voucher_id, context)
        ctx = context.copy()
        ctx.update({'date': voucher_brw.date})
        prec = self.pool.get('decimal.precision').precision_get(cr, uid, 'Account')
        for line in voucher_brw.line_ids:
            #create one move line per voucher line where amount is not 0.0
            # AND (second part of the clause) only if the original move line was not having debit = credit = 0 (which is a legal value)
            if not line.amount and not (line.move_line_id and not float_compare(line.move_line_id.debit, line.move_line_id.credit, precision_rounding=prec) and not float_compare(line.move_line_id.debit, 0.0, precision_rounding=prec)):
                continue
            # convert the amount set on the voucher line into the currency of the voucher's company
            amount = self._convert_amount(cr, uid, line.untax_amount or line.amount, voucher_brw.id, context=ctx)
            # if the amount encoded in voucher is equal to the amount unreconciled, we need to compute the
            # currency rate difference
            if line.amount == line.amount_unreconciled:
                if not line.move_line_id:
                    raise osv.except_osv(_('Wrong voucher line'),_("The invoice you are willing to pay is not valid anymore."))
                sign = voucher_brw.type in ('payment', 'purchase') and -1 or 1
                currency_rate_difference = sign * (line.move_line_id.amount_residual - amount)
            else:
                currency_rate_difference = 0.0
            move_line = {
                'journal_id': voucher_brw.journal_id.id,
                'period_id': voucher_brw.period_id.id,
                'name': line.name or '/',
                'account_id': line.account_id.id,
                'move_id': move_id,
                'partner_id': voucher_brw.partner_id.id,
                'currency_id': line.move_line_id and (company_currency <> line.move_line_id.currency_id.id and line.move_line_id.currency_id.id) or False,
                'analytic_account_id': line.account_analytic_id and line.account_analytic_id.id or False,
                'quantity': 1,
                'credit': 0.0,
                'debit': 0.0,
                'date': voucher_brw.date
            }
            if amount < 0:
                amount = -amount
                if line.type == 'dr':
                    line.type = 'cr'
                else:
                    line.type = 'dr'

            if (line.type=='dr'):
                tot_line += amount
                move_line['debit'] = amount
            else:
                tot_line -= amount
                move_line['credit'] = amount

            if voucher_brw.tax_id and voucher_brw.type in ('sale', 'purchase'):
                move_line.update({
                    'account_tax_id': voucher_brw.tax_id.id,
                })

            if move_line.get('account_tax_id', False):
                tax_data = tax_obj.browse(cr, uid, [move_line['account_tax_id']], context=context)[0]
                if not (tax_data.base_code_id and tax_data.tax_code_id):
                    raise osv.except_osv(_('No Account Base Code and Account Tax Code!'),_("You have to configure account base code and account tax code on the '%s' tax!") % (tax_data.name))

            # compute the amount in foreign currency
            foreign_currency_diff = 0.0
            amount_currency = False
            if line.move_line_id:
                voucher_currency = voucher_brw.currency_id and voucher_brw.currency_id.id or voucher_brw.journal_id.company_id.currency_id.id
                # We want to set it on the account move line as soon as the original line had a foreign currency
                if line.move_line_id.currency_id and line.move_line_id.currency_id.id != company_currency:
                    # we compute the amount in that foreign currency.
                    if line.move_line_id.currency_id.id == current_currency:
                        # if the voucher and the voucher line share the same currency, there is no computation to do
                        sign = (move_line['debit'] - move_line['credit']) < 0 and -1 or 1
                        amount_currency = sign * (line.amount)
                    elif line.move_line_id.currency_id.id == voucher_brw.payment_rate_currency_id.id:
                        # if the rate is specified on the voucher, we must use it
                        voucher_rate = currency_obj.browse(cr, uid, voucher_currency, context=ctx).rate
                        amount_currency = (move_line['debit'] - move_line['credit']) * voucher_brw.payment_rate * voucher_rate
                    else:
                        # otherwise we use the rates of the system (giving the voucher date in the context)
                        amount_currency = currency_obj.compute(cr, uid, company_currency, line.move_line_id.currency_id.id, move_line['debit']-move_line['credit'], context=ctx)
                if line.amount == line.amount_unreconciled and line.move_line_id.currency_id.id == voucher_currency:
                    sign = voucher_brw.type in ('payment', 'purchase') and -1 or 1
                    foreign_currency_diff = sign * line.move_line_id.amount_residual_currency + amount_currency

            move_line['amount_currency'] = amount_currency
            voucher_line = move_line_obj.create(cr, uid, move_line)
            rec_ids = [voucher_line, line.move_line_id.id]

            if not currency_obj.is_zero(cr, uid, voucher_brw.company_id.currency_id, currency_rate_difference):
                # Change difference entry in company currency
                exch_lines = self._get_exchange_lines(cr, uid, line, move_id, currency_rate_difference, company_currency, current_currency, context=context)
                new_id = move_line_obj.create(cr, uid, exch_lines[0],context)
                move_line_obj.create(cr, uid, exch_lines[1], context)
                rec_ids.append(new_id)

            if line.move_line_id and line.move_line_id.currency_id and not currency_obj.is_zero(cr, uid, line.move_line_id.currency_id, foreign_currency_diff):
                # Change difference entry in voucher currency
                move_line_foreign_currency = {
                    'journal_id': line.voucher_id.journal_id.id,
                    'period_id': line.voucher_id.period_id.id,
                    'name': _('change')+': '+(line.name or '/'),
                    'account_id': line.account_id.id,
                    'move_id': move_id,
                    'partner_id': line.voucher_id.partner_id.id,
                    'currency_id': line.move_line_id.currency_id.id,
                    'amount_currency': -1 * foreign_currency_diff,
                    'quantity': 1,
                    'credit': 0.0,
                    'debit': 0.0,
                    'date': line.voucher_id.date,
                }
                new_id = move_line_obj.create(cr, uid, move_line_foreign_currency, context=context)
                rec_ids.append(new_id)

            if line.move_line_id.id:
                rec_lst_ids.append(rec_ids)

        return (tot_line, rec_lst_ids)

    def writeoff_move_line_get(self, cr, uid, voucher_id, line_total, move_id, name, company_currency, current_currency, context=None):
        '''
        Set a dict to be use to create the writeoff move line.

        :param voucher_id: Id of voucher what we are creating account_move.
        :param line_total: Amount remaining to be allocated on lines.
        :param move_id: Id of account move where this line will be added.
        :param name: Description of account move line.
        :param company_currency: id of currency of the company to which the voucher belong
        :param current_currency: id of currency of the voucher
        :return: mapping between fieldname and value of account move line to create
        :rtype: dict
        '''
        currency_obj = self.pool.get('res.currency')
        move_line = {}

        voucher_brw = self.pool.get('account.voucher').browse(cr,uid,voucher_id,context)
        current_currency_obj = voucher_brw.currency_id or voucher_brw.journal_id.company_id.currency_id

        if not currency_obj.is_zero(cr, uid, current_currency_obj, line_total):
            diff = line_total
            account_id = False
            write_off_name = ''
            if voucher_brw.payment_option == 'with_writeoff':
                account_id = voucher_brw.writeoff_acc_id.id
                write_off_name = voucher_brw.comment
            elif voucher_brw.type in ('sale', 'receipt'):
                account_id = voucher_brw.partner_id.property_account_receivable.id
            else:
                account_id = voucher_brw.partner_id.property_account_payable.id
            sign = voucher_brw.type == 'payment' and -1 or 1
            move_line = {
                'name': write_off_name or name,
                'account_id': account_id,
                'move_id': move_id,
                'partner_id': voucher_brw.partner_id.id,
                'date': voucher_brw.date,
                'credit': diff > 0 and diff or 0.0,
                'debit': diff < 0 and -diff or 0.0,
                'amount_currency': company_currency <> current_currency and (sign * -1 * voucher_brw.writeoff_amount) or False,
                'currency_id': company_currency <> current_currency and current_currency or False,
                'analytic_account_id': voucher_brw.analytic_id and voucher_brw.analytic_id.id or False,
            }

        return move_line

    def _get_company_currency(self, cr, uid, voucher_id, context=None):
        '''
        Get the currency of the actual company.

        :param voucher_id: Id of the voucher what i want to obtain company currency.
        :return: currency id of the company of the voucher
        :rtype: int
        '''
        return self.pool.get('account.voucher').browse(cr,uid,voucher_id,context).journal_id.company_id.currency_id.id

    def _get_current_currency(self, cr, uid, voucher_id, context=None):
        '''
        Get the currency of the voucher.

        :param voucher_id: Id of the voucher what i want to obtain current currency.
        :return: currency id of the voucher
        :rtype: int
        '''
        voucher = self.pool.get('account.voucher').browse(cr,uid,voucher_id,context)
        return voucher.currency_id.id or self._get_company_currency(cr,uid,voucher.id,context)

    def action_move_line_create(self, cr, uid, ids, context=None):
        '''
        Confirm the vouchers given in ids and create the journal entries for each of them
        '''
        if context is None:
            context = {}
        move_pool = self.pool.get('account.move')
        move_line_pool = self.pool.get('account.move.line')
        for voucher in self.browse(cr, uid, ids, context=context):
            if voucher.move_id:
                continue
            company_currency = self._get_company_currency(cr, uid, voucher.id, context)
            current_currency = self._get_current_currency(cr, uid, voucher.id, context)
            # we select the context to use accordingly if it's a multicurrency case or not
            context = self._sel_context(cr, uid, voucher.id, context)
            # But for the operations made by _convert_amount, we always need to give the date in the context
            ctx = context.copy()
            ctx.update({'date': voucher.date})
            # Create the account move record.
            move_id = move_pool.create(cr, uid, self.account_move_get(cr, uid, voucher.id, context=context), context=context)
            # Get the name of the account_move just created
            name = move_pool.browse(cr, uid, move_id, context=context).name
            # Create the first line of the voucher
            move_line_id = move_line_pool.create(cr, uid, self.first_move_line_get(cr,uid,voucher.id, move_id, company_currency, current_currency, context), context)
            move_line_brw = move_line_pool.browse(cr, uid, move_line_id, context=context)
            line_total = move_line_brw.debit - move_line_brw.credit
            rec_list_ids = []
            if voucher.type == 'sale':
                line_total = line_total - self._convert_amount(cr, uid, voucher.tax_amount, voucher.id, context=ctx)
            elif voucher.type == 'purchase':
                line_total = line_total + self._convert_amount(cr, uid, voucher.tax_amount, voucher.id, context=ctx)
            # Create one move line per voucher line where amount is not 0.0
            line_total, rec_list_ids = self.voucher_move_line_create(cr, uid, voucher.id, line_total, move_id, company_currency, current_currency, context)

            # Create the writeoff line if needed
            ml_writeoff = self.writeoff_move_line_get(cr, uid, voucher.id, line_total, move_id, name, company_currency, current_currency, context)
            if ml_writeoff:
                move_line_pool.create(cr, uid, ml_writeoff, context)
            # We post the voucher.
            self.write(cr, uid, [voucher.id], {
                'move_id': move_id,
                'state': 'posted',
                'number': name,
            })
            if voucher.journal_id.entry_posted:
                move_pool.post(cr, uid, [move_id], context={})
            # We automatically reconcile the account move lines.
            reconcile = False
            for rec_ids in rec_list_ids:
                if len(rec_ids) >= 2:
                    reconcile = move_line_pool.reconcile_partial(cr, uid, rec_ids, writeoff_acc_id=voucher.writeoff_acc_id.id, writeoff_period_id=voucher.period_id.id, writeoff_journal_id=voucher.journal_id.id)
        return True

    def copy(self, cr, uid, id, default=None, context=None):
        if default is None:
            default = {}
        default.update({
            'state': 'draft',
            'number': False,
            'move_id': False,
            'line_cr_ids': False,
            'line_dr_ids': False,
            'reference': False
        })
        if 'date' not in default:
            default['date'] = time.strftime('%Y-%m-%d')
        return super(account_voucher, self).copy(cr, uid, id, default, context)


class account_voucher_line(osv.osv):
    _name = 'account.voucher.line'
    _description = 'Voucher Lines'
    _order = "move_line_id"

    # If the payment is in the same currency than the invoice, we keep the same amount
    # Otherwise, we compute from company currency to payment currency
    def _compute_balance(self, cr, uid, ids, name, args, context=None):
        currency_pool = self.pool.get('res.currency')
        rs_data = {}
        for line in self.browse(cr, uid, ids, context=context):
            ctx = context.copy()
            ctx.update({'date': line.voucher_id.date})
            res = {}
            company_currency = line.voucher_id.journal_id.company_id.currency_id.id
            voucher_currency = line.voucher_id.currency_id and line.voucher_id.currency_id.id or company_currency
            move_line = line.move_line_id or False

            if not move_line:
                res['amount_original'] = 0.0
                res['amount_unreconciled'] = 0.0
            elif move_line.currency_id and voucher_currency==move_line.currency_id.id:
                res['amount_original'] = currency_pool.compute(cr, uid, move_line.currency_id.id, voucher_currency, abs(move_line.amount_currency), context=ctx)
                res['amount_unreconciled'] = currency_pool.compute(cr, uid, move_line.currency_id and move_line.currency_id.id or company_currency, voucher_currency, abs(move_line.amount_residual_currency), context=ctx)
            elif move_line and move_line.credit > 0:
                res['amount_original'] = currency_pool.compute(cr, uid, company_currency, voucher_currency, move_line.credit, context=ctx)
                res['amount_unreconciled'] = currency_pool.compute(cr, uid, company_currency, voucher_currency, abs(move_line.amount_residual), context=ctx)
            else:
                res['amount_original'] = currency_pool.compute(cr, uid, company_currency, voucher_currency, move_line.debit, context=ctx)
                res['amount_unreconciled'] = currency_pool.compute(cr, uid, company_currency, voucher_currency, abs(move_line.amount_residual), context=ctx)

            rs_data[line.id] = res
        return rs_data

    def _currency_id(self, cr, uid, ids, name, args, context=None):
        '''
        This function returns the currency id of a voucher line. It's either the currency of the
        associated move line (if any) or the currency of the voucher or the company currency.
        '''
        res = {}
        for line in self.browse(cr, uid, ids, context=context):
            move_line = line.move_line_id
            if move_line:
                res[line.id] = move_line.currency_id and move_line.currency_id.id or move_line.company_id.currency_id.id
            else:
                res[line.id] = line.voucher_id.currency_id and line.voucher_id.currency_id.id or line.voucher_id.company_id.currency_id.id
        return res

    _columns = {
        'voucher_id':fields.many2one('account.voucher', 'Voucher', required=1, ondelete='cascade'),
        'name':fields.char('Description', size=256),
        'account_id':fields.many2one('account.account','Account', required=True),
        'partner_id':fields.related('voucher_id', 'partner_id', type='many2one', relation='res.partner', string='Partner'),
        'untax_amount':fields.float('Untax Amount'),
        'amount':fields.float('Amount', digits_compute=dp.get_precision('Account')),
        'reconcile': fields.boolean('Full Reconcile'),
        'type':fields.selection([('dr','Debit'),('cr','Credit')], 'Dr/Cr'),
        'account_analytic_id':  fields.many2one('account.analytic.account', 'Analytic Account'),
        'move_line_id': fields.many2one('account.move.line', 'Journal Item'),
        'date_original': fields.related('move_line_id','date', type='date', relation='account.move.line', string='Date', readonly=1),
        'date_due': fields.related('move_line_id','date_maturity', type='date', relation='account.move.line', string='Due Date', readonly=1),
        'amount_original': fields.function(_compute_balance, multi='dc', type='float', string='Original Amount', store=True, digits_compute=dp.get_precision('Account')),
        'amount_unreconciled': fields.function(_compute_balance, multi='dc', type='float', string='Open Balance', store=True, digits_compute=dp.get_precision('Account')),
        'company_id': fields.related('voucher_id','company_id', relation='res.company', type='many2one', string='Company', store=True, readonly=True),
        'currency_id': fields.function(_currency_id, string='Currency', type='many2one', relation='res.currency', readonly=True),
    }
    _defaults = {
        'name': '',
    }

    def onchange_reconcile(self, cr, uid, ids, reconcile, amount, amount_unreconciled, context=None):
        vals = {'amount': 0.0}
        if reconcile:
            vals = { 'amount': amount_unreconciled}
        return {'value': vals}

    def onchange_amount(self, cr, uid, ids, amount, amount_unreconciled, context=None):
        vals = {}
        if amount:
            vals['reconcile'] = (amount == amount_unreconciled)
        return {'value': vals}

    def onchange_move_line_id(self, cr, user, ids, move_line_id, context=None):
        """
        Returns a dict that contains new values and context

        @param move_line_id: latest value from user input for field move_line_id
        @param args: other arguments
        @param context: context arguments, like lang, time zone

        @return: Returns a dict which contains new values, and context
        """
        res = {}
        move_line_pool = self.pool.get('account.move.line')
        if move_line_id:
            move_line = move_line_pool.browse(cr, user, move_line_id, context=context)
            if move_line.credit:
                ttype = 'dr'
            else:
                ttype = 'cr'
            res.update({
                'account_id': move_line.account_id.id,
                'type': ttype,
                'currency_id': move_line.currency_id and move_line.currency_id.id or move_line.company_id.currency_id.id,
            })
        return {
            'value':res,
        }

    def default_get(self, cr, user, fields_list, context=None):
        """
        Returns default values for fields
        @param fields_list: list of fields, for which default values are required to be read
        @param context: context arguments, like lang, time zone

        @return: Returns a dict that contains default values for fields
        """
        if context is None:
            context = {}
        journal_id = context.get('journal_id', False)
        partner_id = context.get('partner_id', False)
        journal_pool = self.pool.get('account.journal')
        partner_pool = self.pool.get('res.partner')
        values = super(account_voucher_line, self).default_get(cr, user, fields_list, context=context)
        if (not journal_id) or ('account_id' not in fields_list):
            return values
        journal = journal_pool.browse(cr, user, journal_id, context=context)
        account_id = False
        ttype = 'cr'
        if journal.type in ('sale', 'sale_refund'):
            account_id = journal.default_credit_account_id and journal.default_credit_account_id.id or False
            ttype = 'cr'
        elif journal.type in ('purchase', 'expense', 'purchase_refund'):
            account_id = journal.default_debit_account_id and journal.default_debit_account_id.id or False
            ttype = 'dr'
        elif partner_id:
            partner = partner_pool.browse(cr, user, partner_id, context=context)
            if context.get('type') == 'payment':
                ttype = 'dr'
                account_id = partner.property_account_payable.id
            elif context.get('type') == 'receipt':
                account_id = partner.property_account_receivable.id

        values.update({
            'account_id':account_id,
            'type':ttype
        })
        return values
account_voucher_line()

class account_bank_statement(osv.osv):
    _inherit = 'account.bank.statement'

    def button_confirm_bank(self, cr, uid, ids, context=None):
        voucher_obj = self.pool.get('account.voucher')
        voucher_ids = []
        for statement in self.browse(cr, uid, ids, context=context):
            voucher_ids += [line.voucher_id.id for line in statement.line_ids if line.voucher_id]
        if voucher_ids:
            voucher_obj.write(cr, uid, voucher_ids, {'active': True}, context=context)
        return super(account_bank_statement, self).button_confirm_bank(cr, uid, ids, context=context)

    def button_cancel(self, cr, uid, ids, context=None):
        voucher_obj = self.pool.get('account.voucher')
        for st in self.browse(cr, uid, ids, context=context):
            voucher_ids = []
            for line in st.line_ids:
                if line.voucher_id:
                    voucher_ids.append(line.voucher_id.id)
            voucher_obj.cancel_voucher(cr, uid, voucher_ids, context)
        return super(account_bank_statement, self).button_cancel(cr, uid, ids, context=context)

    def create_move_from_st_line(self, cr, uid, st_line_id, company_currency_id, next_number, context=None):
        voucher_obj = self.pool.get('account.voucher')
        wf_service = netsvc.LocalService("workflow")
        move_line_obj = self.pool.get('account.move.line')
        bank_st_line_obj = self.pool.get('account.bank.statement.line')
        st_line = bank_st_line_obj.browse(cr, uid, st_line_id, context=context)
        if st_line.voucher_id:
            voucher_obj.write(cr, uid, [st_line.voucher_id.id], {'number': next_number}, context=context)
            if st_line.voucher_id.state == 'cancel':
                voucher_obj.action_cancel_draft(cr, uid, [st_line.voucher_id.id], context=context)
            wf_service.trg_validate(uid, 'account.voucher', st_line.voucher_id.id, 'proforma_voucher', cr)

            v = voucher_obj.browse(cr, uid, st_line.voucher_id.id, context=context)
            bank_st_line_obj.write(cr, uid, [st_line_id], {
                'move_ids': [(4, v.move_id.id, False)]
            })

            return move_line_obj.write(cr, uid, [x.id for x in v.move_ids], {'statement_id': st_line.statement_id.id}, context=context)
        return super(account_bank_statement, self).create_move_from_st_line(cr, uid, st_line.id, company_currency_id, next_number, context=context)

    def write(self, cr, uid, ids, vals, context=None):
        # Restrict to modify the journal if we already have some voucher of reconciliation created/generated.
        # Because the voucher keeps in memory the journal it was created with.
        for bk_st in self.browse(cr, uid, ids, context=context):
            if vals.get('journal_id') and bk_st.line_ids:
                if any([x.voucher_id and True or False for x in bk_st.line_ids]):
                    raise osv.except_osv(_('Unable to change journal !'), _('You can not change the journal as you already reconciled some statement lines!'))
        return super(account_bank_statement, self).write(cr, uid, ids, vals, context=context)

account_bank_statement()

class account_bank_statement_line(osv.osv):
    _inherit = 'account.bank.statement.line'

    def onchange_partner_id(self, cr, uid, ids, partner_id, context=None):
        res = super(account_bank_statement_line, self).onchange_partner_id(cr, uid, ids, partner_id, context=context)
        if 'value' not in res:
            res['value'] = {}
        res['value'].update({'voucher_id' : False})
        return res

    def onchange_amount(self, cr, uid, ids, amount, context=None):
        return {'value' :  {'voucher_id' : False}}

    def _amount_reconciled(self, cursor, user, ids, name, args, context=None):
        if not ids:
            return {}
        res = {}
        for line in self.browse(cursor, user, ids, context=context):
            if line.voucher_id:
                res[line.id] = line.voucher_id.amount#
            else:
                res[line.id] = 0.0
        return res

    def _check_amount(self, cr, uid, ids, context=None):
        for obj in self.browse(cr, uid, ids, context=context):
            if obj.voucher_id:
                diff = abs(obj.amount) - obj.voucher_id.amount
                if not self.pool.get('res.currency').is_zero(cr, uid, obj.statement_id.currency, diff):
                    return False
        return True

    _constraints = [
        (_check_amount, 'The amount of the voucher must be the same amount as the one on the statement line.', ['amount']),
    ]

    _columns = {
        'amount_reconciled': fields.function(_amount_reconciled,
            string='Amount reconciled', type='float'),
        'voucher_id': fields.many2one('account.voucher', 'Reconciliation'),
    }

    def unlink(self, cr, uid, ids, context=None):
        voucher_obj = self.pool.get('account.voucher')
        statement_line = self.browse(cr, uid, ids, context=context)
        unlink_ids = []
        for st_line in statement_line:
            if st_line.voucher_id:
                unlink_ids.append(st_line.voucher_id.id)
        voucher_obj.unlink(cr, uid, unlink_ids, context=context)
        return super(account_bank_statement_line, self).unlink(cr, uid, ids, context=context)

account_bank_statement_line()

def resolve_o2m_operations(cr, uid, target_osv, operations, fields, context):
    results = []
    for operation in operations:
        result = None
        if not isinstance(operation, (list, tuple)):
            result = target_osv.read(cr, uid, operation, fields, context=context)
        elif operation[0] == 0:
            # may be necessary to check if all the fields are here and get the default values?
            result = operation[2]
        elif operation[0] == 1:
            result = target_osv.read(cr, uid, operation[1], fields, context=context)
            if not result: result = {}
            result.update(operation[2])
        elif operation[0] == 4:
            result = target_osv.read(cr, uid, operation[1], fields, context=context)
        if result != None:
            results.append(result)
    return results


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