flectra/addons/l10n_in_gst/models/account_invoice.py

# Part of Flectra See LICENSE file for full copyright and licensing details.

from flectra import api, fields, models, _
from flectra.exceptions import ValidationError


class AccountInvoice(models.Model):
    _inherit = 'account.invoice'

    gst_invoice = fields.Selection(
        [('b2b', 'B2B'), ('b2cl', 'B2CL'), ('b2cs', 'B2CS'),
         ('b2bur', 'B2BUR')], string='GST Invoice',
        help='B2B Supplies: Taxable supplies made to other registered '
             'taxpayers.\n\nB2C Large [For outward supplies]: Taxable '
             'outward '
             'supplies to consumers where\na)The place of supply is '
             'outside the state where the supplier is registered and '
             'b)The '
             'total invoice value is more than the limit defined in '
             'company B2C lines.\ne.g., If in B2C line, B2CL limit is '
             'set to Rs 2,50,000 and invoice is of amount Rs 3,00,000 then'
             'invoice '
             'will be considered as of type B2CL.\n\nB2C Small '
             '[For outward supplies]: Supplies made to consumers and '
             'unregistered persons of the following nature\n'
             'a) Intra-State: any value b) Inter-State: Total invoice '
             'value is'
             ' less than the limit defined in company B2C lines.\n'
             'e.g., If in B2C line, B2CS limit is set to Rs 2,50,000 '
             '(for period 01-01-2017 to 31-12-2017) for inter state '
             'supply '
             'and invoice value is Rs 2,00,000 then invoice will be '
             'considered as of type B2CS.\n\nB2BUR [For inward supplies]: '
             'Inward supplies received from an unregistered supplier \n\n',
        copy=False)
    e_commerce_partner_id = fields.Many2one('res.partner',
                                            string='E-Commerce Partner')
    vat = fields.Char(string='GSTIN',
                      help='Goods and Services Taxpayer Identification '
                           'Number', size=15, copy=False)
    gst_type = fields.Selection(
        [('regular', 'Regular'), ('unregistered', 'Unregistered'),
         ('composite', 'Composite'), ('volunteer', 'Volunteer')],
        string='GST Type', copy=False)
    partner_location = fields.Selection(
        [('inter_state', 'Inter State'), ('intra_state', 'Intra State'),
         ('inter_country', 'Inter Country')],
        related='partner_id.partner_location', string="Partner Location")
    fiscal_position_id = fields.Many2one('account.fiscal.position',
                                         string='Nature of Transaction',
                                         oldname='fiscal_position',
                                         readonly=True,
                                         states={
                                             'draft': [('readonly', False)]})
    reverse_charge = fields.Boolean(
        'Reverse Charge', readonly=True,
        states={'draft': [('readonly', False)]})
    reverse_tax_line_ids = fields.One2many(
        'reverse.account.invoice.tax', 'invoice_id', string='Tax Lines',
        readonly=True, states={'draft': [('readonly', False)]}, copy=False)

    @api.one
    @api.depends(
        'state', 'currency_id', 'invoice_line_ids.price_subtotal',
        'move_id.line_ids.amount_residual',
        'move_id.line_ids.currency_id')
    def _compute_residual(self):
        super(AccountInvoice, self)._compute_residual()
        sign = self.type in ['in_refund', 'out_refund'] and -1 or 1
        if self.reverse_charge:
            residual = self.residual - self.amount_tax
            self.residual_signed = abs(residual) * sign
            self.residual = abs(residual)

    @api.multi
    def action_invoice_open(self):
        if not self.reverse_charge:
            return super(AccountInvoice, self).action_invoice_open()
        list_data = []
        account_tax_obj = self.env['account.tax']
        custom_amount = 0.0
        self.reverse_tax_line_ids = [[6, 0, []]]
        for tax_line in self.tax_line_ids:
            tax_id = account_tax_obj.search([('name', '=', tax_line.name)])
            account_id = tax_id.account_id.id
            if self.partner_id.vat:
                account_id = tax_line.account_id.id
            if not account_id:
                account_id = tax_line.account_id.id
            list_data.append((0, 0, {
                'name': tax_line.name,
                'partner_id':
                    self.partner_id.parent_id.id or self.partner_id.id,
                'account_id': account_id,
                'debit': tax_line.amount_total,
                'move_id': False,
                'invoice_id': self.id,
                'tax_line_id': tax_id,
                'quantity': 1,
                }
            ))

        total_tax_amount = self.amount_tax
        reverse_list_data = []
        for tax_line_id in self.tax_line_ids:
            reverse_list_data.append((0, 0, tax_line_id.read()[0]))

        if reverse_list_data:
            self.update({'reverse_tax_line_ids': reverse_list_data})
        for line_id in self.invoice_line_ids:
            line_id.reverse_invoice_line_tax_ids = \
                [[6, 0, line_id.invoice_line_tax_ids.ids]]

        self.invoice_line_ids.update({'invoice_line_tax_ids': [[6, 0, []]]})
        self.update({'tax_line_ids': [[6, 0, []]], 'amount_tax': 0.0})
        res = super(AccountInvoice, self).action_invoice_open()
        for move_line_id in list_data:
            move_line_id[2].update({'move_id': self.move_id.id})
        list_data.append(
            (0, 0, self.get_move_line_vals(total_tax_amount - custom_amount)))
        self.move_id.state = 'draft'
        self.move_id.line_ids = list_data
        self.move_id.post()
        return res

    @api.multi
    def get_move_line_vals(self, credit):
        return {
            'name': '/',
            'partner_id': self.partner_id.parent_id.id or self.partner_id.id,
            'account_id': self.company_id.rc_gst_account_id.id,
            'credit': credit,
            'move_id': self.move_id.id,
            'invoice_id': self.id,
            'quantity': 1,
        }

    @api.onchange('partner_id', 'company_id')
    def _onchange_partner_id(self):
        super(AccountInvoice, self)._onchange_partner_id()
        if self.partner_id and not self.partner_id.partner_location:
            self.partner_id.partner_location = \
                self.partner_id._get_partner_location_details(self.company_id)

    @api.onchange('fiscal_position_id')
    def _onchange_fiscal_position_id(self):
        """ Onchange of Fiscal Position update tax values in invoice lines. """
        if self.fiscal_position_id:
            for line in self.invoice_line_ids:
                line._set_taxes()

    @api.multi
    @api.returns('self')
    def refund(self, date_invoice=None,
               date=None, description=None, journal_id=None):
        result = super(AccountInvoice, self).refund(
            date_invoice=date_invoice, date=date,
            description=description, journal_id=journal_id)
        if result.refund_invoice_id.type == 'in_invoice':
            result.write(
                {'reverse_charge': result.refund_invoice_id.reverse_charge})
        if result.type == 'in_refund' \
                and result.refund_invoice_id.reverse_charge:
            for index, line_id in enumerate(result.invoice_line_ids):
                line_id.invoice_line_tax_ids = [[
                    6, 0, result.refund_invoice_id.invoice_line_ids[
                        index].reverse_invoice_line_tax_ids.ids]]
            result._onchange_invoice_line_ids()
        return result

    @api.multi
    def action_move_create(self):
        """ Do not apply taxes if company has been registered under
        composition scheme. """
        for invoice in self:
            if invoice.type in ('out_invoice',
                                'out_refund') and \
                    invoice.company_id.gst_type == 'composite':
                for line in invoice.invoice_line_ids:
                    line.invoice_line_tax_ids = [(6, 0, [])]
                    line.invoice_id._onchange_invoice_line_ids()
        return super(AccountInvoice, self).action_move_create()

    @api.multi
    def invoice_validate(self):
        """ Apply GST invoice type at the time of invoice validation. """
        for invoice in self:
            partner_location = self.partner_id.partner_location
            if invoice.partner_id.vat:
                invoice.write({
                    'vat': invoice.partner_id.vat,
                    'gst_type': invoice.partner_id.gst_type,
                    'gst_invoice': 'b2b'
                })
            elif invoice.type == 'out_invoice' and partner_location:
                b2c_limit = self.env['res.company.b2c.limit'].search(
                    [('date_from', '<=', invoice.date_invoice),
                     ('date_to', '>=', invoice.date_invoice),
                     ('company_id', '=', invoice.company_id.id)])
                if not b2c_limit:
                    raise ValidationError(_('Please define B2C limit line in '
                                            'company for current period!'))
                if partner_location == 'inter_state' and \
                        invoice.amount_total > b2c_limit.b2cl_limit:
                    invoice.write({'gst_invoice': 'b2cl'})
                if partner_location == 'intra_state' or partner_location == \
                        'inter_state' and invoice.amount_total < \
                        b2c_limit.b2cs_limit:
                    invoice.write({'gst_invoice': 'b2cs'})
            elif invoice.type == 'in_invoice' and partner_location and \
                    partner_location != 'inter_country':
                invoice.write({'gst_invoice': 'b2bur'})

        return super(AccountInvoice, self).invoice_validate()

    @api.model
    def _prepare_refund(self, invoice, date_invoice=None, date=None,
                        description=None, journal_id=None):
        """ Refund invoice creation, update value of GST Invoice from
        base invoice. """
        result = super(AccountInvoice, self)._prepare_refund(
            invoice, date_invoice=date_invoice, date=date,
            description=description, journal_id=journal_id)
        if result.get('refund_invoice_id'):
            invoice = self.env['account.invoice'].browse(
                result.get('refund_invoice_id'))
            result.update({
                'gst_invoice': invoice.gst_invoice, 'vat': invoice.vat,
                'gst_type': invoice.gst_type,
            })
        return result

class ReverseAccountInvoiceTax(models.Model):
    _inherit = 'account.invoice.tax'
    _name = 'reverse.account.invoice.tax'


class AccountInvoiceLine(models.Model):
    _inherit = "account.invoice.line"

    reverse_invoice_line_tax_ids = fields.Many2many(
        'account.tax', string='Taxes', copy=False)