# -*- coding: utf-8 -*-
# Part of Odoo. See LICENSE file for full copyright and licensing details.

from datetime import datetime
from uuid import uuid4
import pytz

from odoo import api, fields, models, _
from odoo.exceptions import ValidationError, UserError


class AccountBankStmtCashWizard(models.Model):
    _inherit = 'account.bank.statement.cashbox'

    @api.depends('pos_config_ids')
    @api.depends_context('current_currency_id')
    def _compute_currency(self):
        super(AccountBankStmtCashWizard, self)._compute_currency()
        for cashbox in self:
            if cashbox.pos_config_ids:
                cashbox.currency_id = cashbox.pos_config_ids[0].currency_id.id
            elif self.env.context.get('current_currency_id'):
                cashbox.currency_id = self.env.context.get('current_currency_id')

    pos_config_ids = fields.One2many('pos.config', 'default_cashbox_id')
    is_a_template = fields.Boolean(default=False)

    @api.model
    def default_get(self, fields):
        vals = super(AccountBankStmtCashWizard, self).default_get(fields)
        if "is_a_template" in fields and self.env.context.get('default_is_a_template'):
            vals['is_a_template'] = True
        config_id = self.env.context.get('default_pos_id')
        if config_id:
            config = self.env['pos.config'].browse(config_id)
            if config.last_session_closing_cashbox.cashbox_lines_ids:
                lines = config.last_session_closing_cashbox.cashbox_lines_ids
            else:
                lines = config.default_cashbox_id.cashbox_lines_ids
            if self.env.context.get('balance', False) == 'start':
                vals['cashbox_lines_ids'] = [[0, 0, {'coin_value': line.coin_value, 'number': line.number, 'subtotal': line.subtotal}] for line in lines]
            else:
                vals['cashbox_lines_ids'] = [[0, 0, {'coin_value': line.coin_value, 'number': 0, 'subtotal': 0.0}] for line in lines]
        return vals

    def _validate_cashbox(self):
        super(AccountBankStmtCashWizard, self)._validate_cashbox()
        session_id = self.env.context.get('pos_session_id')
        if session_id:
            current_session = self.env['pos.session'].browse(session_id)
            if current_session.state == 'new_session':
                current_session.write({'state': 'opening_control'})

    def set_default_cashbox(self):
        self.ensure_one()
        current_session = self.env['pos.session'].browse(self.env.context['pos_session_id'])
        lines = current_session.config_id.default_cashbox_id.cashbox_lines_ids
        context = dict(self._context)
        self.cashbox_lines_ids.unlink()
        self.cashbox_lines_ids = [[0, 0, {'coin_value': line.coin_value, 'number': line.number, 'subtotal': line.subtotal}] for line in lines]

        return {
            'name': _('Cash Control'),
            'view_type': 'form',
            'view_mode': 'form',
            'res_model': 'account.bank.statement.cashbox',
            'view_id': self.env.ref('point_of_sale.view_account_bnk_stmt_cashbox_footer').id,
            'type': 'ir.actions.act_window',
            'context': context,
            'target': 'new',
            'res_id': self.id,
        }


class PosConfig(models.Model):
    _name = 'pos.config'
    _description = 'Point of Sale Configuration'

    def _default_picking_type_id(self):
        return self.env['stock.warehouse'].search([('company_id', '=', self.env.company.id)], limit=1).pos_type_id.id

    def _default_sale_journal(self):
        return self.env['account.journal'].search([('type', '=', 'sale'), ('company_id', '=', self.env.company.id), ('code', '=', 'POSS')], limit=1)

    def _default_invoice_journal(self):
        return self.env['account.journal'].search([('type', '=', 'sale'), ('company_id', '=', self.env.company.id)], limit=1)

    def _default_payment_methods(self):
        return self.env['pos.payment.method'].search([('split_transactions', '=', False), ('company_id', '=', self.env.company.id)])

    def _default_pricelist(self):
        return self.env['product.pricelist'].search([('company_id', 'in', (False, self.env.company.id)), ('currency_id', '=', self.env.company.currency_id.id)], limit=1)

    def _get_group_pos_manager(self):
        return self.env.ref('point_of_sale.group_pos_manager')

    def _get_group_pos_user(self):
        return self.env.ref('point_of_sale.group_pos_user')

    def _compute_customer_html(self):
        for config in self:
            config.customer_facing_display_html = self.env['ir.qweb'].render('point_of_sale.customer_facing_display_html')

    name = fields.Char(string='Point of Sale', index=True, required=True, help="An internal identification of the point of sale.")
    is_installed_account_accountant = fields.Boolean(string="Is the Full Accounting Installed",
        compute="_compute_is_installed_account_accountant")
    picking_type_id = fields.Many2one(
        'stock.picking.type',
        string='Operation Type',
        default=_default_picking_type_id,
        domain="[('code', '=', 'outgoing'), ('warehouse_id.company_id', '=', company_id)]",
        ondelete='restrict')
    use_existing_lots = fields.Boolean(related='picking_type_id.use_existing_lots', readonly=False)
    journal_id = fields.Many2one(
        'account.journal', string='Sales Journal',
        domain=[('type', '=', 'sale')],
        help="Accounting journal used to post sales entries.",
        default=_default_sale_journal)
    invoice_journal_id = fields.Many2one(
        'account.journal', string='Invoice Journal',
        domain=[('type', '=', 'sale')],
        help="Accounting journal used to create invoices.",
        default=_default_invoice_journal)
    currency_id = fields.Many2one('res.currency', compute='_compute_currency', string="Currency")
    iface_cashdrawer = fields.Boolean(string='Cashdrawer', help="Automatically open the cashdrawer.")
    iface_electronic_scale = fields.Boolean(string='Electronic Scale', help="Enables Electronic Scale integration.")
    iface_vkeyboard = fields.Boolean(string='Virtual KeyBoard', help=u"Don’t turn this option on if you take orders on smartphones or tablets. \n Such devices already benefit from a native keyboard.")
    iface_customer_facing_display = fields.Boolean(string='Customer Facing Display', help="Show checkout to customers with a remotely-connected screen.")
    iface_print_via_proxy = fields.Boolean(string='Print via Proxy', help="Bypass browser printing and prints via the hardware proxy.")
    iface_scan_via_proxy = fields.Boolean(string='Scan via Proxy', help="Enable barcode scanning with a remotely connected barcode scanner.")
    iface_big_scrollbars = fields.Boolean('Large Scrollbars', help='For imprecise industrial touchscreens.')
    iface_print_auto = fields.Boolean(string='Automatic Receipt Printing', default=False,
        help='The receipt will automatically be printed at the end of each order.')
    iface_print_skip_screen = fields.Boolean(string='Skip Preview Screen', default=True,
        help='The receipt screen will be skipped if the receipt can be printed automatically.')
    iface_precompute_cash = fields.Boolean(string='Prefill Cash Payment',
        help='The payment input will behave similarily to bank payment input, and will be prefilled with the exact due amount.')
    iface_tax_included = fields.Selection([('subtotal', 'Tax-Excluded Price'), ('total', 'Tax-Included Price')], string="Tax Display", default='subtotal', required=True)
    iface_start_categ_id = fields.Many2one('pos.category', string='Initial Category',
        help='The point of sale will display this product category by default. If no category is specified, all available products will be shown.')
    iface_available_categ_ids = fields.Many2many('pos.category', string='Available PoS Product Categories',
        help='The point of sale will only display products which are within one of the selected category trees. If no category is specified, all available products will be shown')
    selectable_categ_ids = fields.Many2many('pos.category', compute='_compute_selectable_categories')
    iface_display_categ_images = fields.Boolean(string='Display Category Pictures',
        help="The product categories will be displayed with pictures.")
    restrict_price_control = fields.Boolean(string='Restrict Price Modifications to Managers',
        help="Only users with Manager access rights for PoS app can modify the product prices on orders.")
    cash_control = fields.Boolean(string='Cash Control', help="Check the amount of the cashbox at opening and closing.")
    receipt_header = fields.Text(string='Receipt Header', help="A short text that will be inserted as a header in the printed receipt.")
    receipt_footer = fields.Text(string='Receipt Footer', help="A short text that will be inserted as a footer in the printed receipt.")
    proxy_ip = fields.Char(string='IP Address', size=45,
        help='The hostname or ip address of the hardware proxy, Will be autodetected if left empty.')
    active = fields.Boolean(default=True)
    uuid = fields.Char(readonly=True, default=lambda self: str(uuid4()),
        help='A globally unique identifier for this pos configuration, used to prevent conflicts in client-generated data.')
    sequence_id = fields.Many2one('ir.sequence', string='Order IDs Sequence', readonly=True,
        help="This sequence is automatically created by Odoo but you can change it "
        "to customize the reference numbers of your orders.", copy=False, ondelete='restrict')
    sequence_line_id = fields.Many2one('ir.sequence', string='Order Line IDs Sequence', readonly=True,
        help="This sequence is automatically created by Odoo but you can change it "
        "to customize the reference numbers of your orders lines.", copy=False)
    session_ids = fields.One2many('pos.session', 'config_id', string='Sessions')
    current_session_id = fields.Many2one('pos.session', compute='_compute_current_session', string="Current Session")
    current_session_state = fields.Char(compute='_compute_current_session')
    last_session_closing_cash = fields.Float(compute='_compute_last_session')
    last_session_closing_date = fields.Date(compute='_compute_last_session')
    last_session_closing_cashbox = fields.Many2one('account.bank.statement.cashbox', compute='_compute_last_session')
    pos_session_username = fields.Char(compute='_compute_current_session_user')
    pos_session_state = fields.Char(compute='_compute_current_session_user')
    pos_session_duration = fields.Char(compute='_compute_current_session_user')
    pricelist_id = fields.Many2one('product.pricelist', string='Default Pricelist', required=True, default=_default_pricelist,
        help="The pricelist used if no customer is selected or if the customer has no Sale Pricelist configured.")
    available_pricelist_ids = fields.Many2many('product.pricelist', string='Available Pricelists', default=_default_pricelist,
        help="Make several pricelists available in the Point of Sale. You can also apply a pricelist to specific customers from their contact form (in Sales tab). To be valid, this pricelist must be listed here as an available pricelist. Otherwise the default pricelist will apply.")
    allowed_pricelist_ids = fields.Many2many(
        'product.pricelist',
        string='Allowed Pricelists',
        compute='_compute_allowed_pricelist_ids',
        help='This is a technical field used for the domain of pricelist_id.',
    )
    company_id = fields.Many2one('res.company', string='Company', required=True, default=lambda self: self.env.company)
    barcode_nomenclature_id = fields.Many2one('barcode.nomenclature', string='Barcode Nomenclature',
        help='Defines what kind of barcodes are available and how they are assigned to products, customers and cashiers.',
        default=lambda self: self.env.company.nomenclature_id, required=True)
    group_pos_manager_id = fields.Many2one('res.groups', string='Point of Sale Manager Group', default=_get_group_pos_manager,
        help='This field is there to pass the id of the pos manager group to the point of sale client.')
    group_pos_user_id = fields.Many2one('res.groups', string='Point of Sale User Group', default=_get_group_pos_user,
        help='This field is there to pass the id of the pos user group to the point of sale client.')
    iface_tipproduct = fields.Boolean(string="Product tips")
    tip_product_id = fields.Many2one('product.product', string='Tip Product',
        help="This product is used as reference on customer receipts.")
    fiscal_position_ids = fields.Many2many('account.fiscal.position', string='Fiscal Positions', help='This is useful for restaurants with onsite and take-away services that imply specific tax rates.')
    default_fiscal_position_id = fields.Many2one('account.fiscal.position', string='Default Fiscal Position')
    default_cashbox_id = fields.Many2one('account.bank.statement.cashbox', string='Default Balance')
    customer_facing_display_html = fields.Html(string='Customer facing display content', translate=True, compute=_compute_customer_html)
    use_pricelist = fields.Boolean("Use a pricelist.")
    tax_regime = fields.Boolean("Tax Regime")
    tax_regime_selection = fields.Boolean("Tax Regime Selection value")
    start_category = fields.Boolean("Set Start Category", default=False)
    limit_categories = fields.Boolean("Restrict Available Product Categories")
    module_account = fields.Boolean(string='Invoicing', help='Enables invoice generation from the Point of Sale.')
    module_pos_restaurant = fields.Boolean("Is a Bar/Restaurant")
    module_pos_discount = fields.Boolean("Global Discounts")
    module_pos_loyalty = fields.Boolean("Loyalty Program")
    module_pos_mercury = fields.Boolean(string="Integrated Card Payments")
    module_pos_reprint = fields.Boolean(string="Reprint Receipt")
    is_posbox = fields.Boolean("PosBox")
    is_header_or_footer = fields.Boolean("Header & Footer")
    module_pos_hr = fields.Boolean(help="Show employee login screen")
    amount_authorized_diff = fields.Float('Amount Authorized Difference',
        help="This field depicts the maximum difference allowed between the ending balance and the theoretical cash when "
             "closing a session, for non-POS managers. If this maximum is reached, the user will have an error message at "
             "the closing of his session saying that he needs to contact his manager.")
    payment_method_ids = fields.Many2many('pos.payment.method', string='Payment Methods', default=lambda self: self._default_payment_methods())
    company_has_template = fields.Boolean(string="Company has chart of accounts", compute="_compute_company_has_template")
    current_user_id = fields.Many2one('res.users', string='Current Session Responsible', compute='_compute_current_session_user')
    other_devices = fields.Boolean(string="Other Devices", help="Connect devices to your PoS without an IoT Box.")

    @api.depends('use_pricelist', 'available_pricelist_ids')
    def _compute_allowed_pricelist_ids(self):
        for config in self:
            if config.use_pricelist:
                config.allowed_pricelist_ids = config.available_pricelist_ids.ids
            else:
                config.allowed_pricelist_ids = self.env['product.pricelist'].search([]).ids

    @api.depends('company_id')
    def _compute_company_has_template(self):
        for config in self:
            if config.company_id.chart_template_id:
                config.company_has_template = True
            else:
                config.company_has_template = False

    def _compute_is_installed_account_accountant(self):
        account_accountant = self.env['ir.module.module'].sudo().search([('name', '=', 'account_accountant'), ('state', '=', 'installed')])
        for pos_config in self:
            pos_config.is_installed_account_accountant = account_accountant and account_accountant.id

    @api.depends('journal_id.currency_id', 'journal_id.company_id.currency_id', 'company_id', 'company_id.currency_id')
    def _compute_currency(self):
        for pos_config in self:
            if pos_config.journal_id:
                pos_config.currency_id = pos_config.journal_id.currency_id.id or pos_config.journal_id.company_id.currency_id.id
            else:
                pos_config.currency_id = pos_config.company_id.currency_id.id

    @api.depends('session_ids', 'session_ids.state')
    def _compute_current_session(self):
        """If there is an open session, store it to current_session_id / current_session_State.
        """
        for pos_config in self:
            session = pos_config.session_ids.filtered(lambda s: not s.state == 'closed' and not s.rescue)
            # sessions ordered by id desc
            pos_config.current_session_id = session and session[0].id or False
            pos_config.current_session_state = session and session[0].state or False

    @api.depends('session_ids')
    def _compute_last_session(self):
        PosSession = self.env['pos.session']
        for pos_config in self:
            session = PosSession.search_read(
                [('config_id', '=', pos_config.id), ('state', '=', 'closed')],
                ['cash_register_balance_end_real', 'stop_at', 'cash_register_id'],
                order="stop_at desc", limit=1)
            if session:
                timezone = pytz.timezone(self._context.get('tz') or self.env.user.tz or 'UTC')
                pos_config.last_session_closing_date = session[0]['stop_at'].astimezone(timezone).date()
                if session[0]['cash_register_id']:
                    pos_config.last_session_closing_cash = session[0]['cash_register_balance_end_real']
                    pos_config.last_session_closing_cashbox = self.env['account.bank.statement'].browse(session[0]['cash_register_id'][0]).cashbox_end_id
                else:
                    pos_config.last_session_closing_cash = 0
                    pos_config.last_session_closing_cashbox = False
            else:
                pos_config.last_session_closing_cash = 0
                pos_config.last_session_closing_date = False
                pos_config.last_session_closing_cashbox = False

    @api.depends('session_ids')
    def _compute_current_session_user(self):
        for pos_config in self:
            session = pos_config.session_ids.filtered(lambda s: s.state in ['new_session', 'opening_control', 'opened', 'closing_control'] and not s.rescue)
            if session:
                pos_config.pos_session_username = session[0].user_id.sudo().name
                pos_config.pos_session_state = session[0].state
                pos_config.pos_session_duration = (
                    datetime.now() - session[0].start_at
                ).days if session[0].start_at else 0
                pos_config.current_user_id = session[0].user_id
            else:
                pos_config.pos_session_username = False
                pos_config.pos_session_state = False
                pos_config.pos_session_duration = 0
                pos_config.current_user_id = False

    @api.depends('iface_available_categ_ids')
    def _compute_selectable_categories(self):
        for config in self:
            if config.iface_available_categ_ids:
                config.selectable_categ_ids = config.iface_available_categ_ids
            else:
                config.selectable_categ_ids = self.env['pos.category'].search([])

    @api.constrains('cash_control')
    def _check_session_state(self):
        open_session = self.env['pos.session'].search([('config_id', '=', self.id), ('state', '!=', 'closed')])
        if open_session:
            raise ValidationError(_("You are not allowed to change the cash control status while a session is already opened."))

    @api.constrains('company_id', 'journal_id')
    def _check_company_journal(self):
        if self.journal_id and self.journal_id.company_id.id != self.company_id.id:
            raise ValidationError(_("The sales journal and the point of sale must belong to the same company."))

    @api.constrains('company_id', 'invoice_journal_id')
    def _check_company_invoice_journal(self):
        if self.invoice_journal_id and self.invoice_journal_id.company_id.id != self.company_id.id:
            raise ValidationError(_("The invoice journal and the point of sale must belong to the same company."))

    @api.constrains('company_id', 'payment_method_ids')
    def _check_company_payment(self):
        if self.env['pos.payment.method'].search_count([('id', 'in', self.payment_method_ids.ids), ('company_id', '!=', self.company_id.id)]):
            raise ValidationError(_("The method payments and the point of sale must belong to the same company."))

    @api.constrains('pricelist_id', 'use_pricelist', 'available_pricelist_ids', 'journal_id', 'invoice_journal_id', 'payment_method_ids')
    def _check_currencies(self):
        for config in self:
            if config.use_pricelist and config.pricelist_id not in config.available_pricelist_ids:
                raise ValidationError(_("The default pricelist must be included in the available pricelists."))
        if any(self.available_pricelist_ids.mapped(lambda pricelist: pricelist.currency_id != self.currency_id)):
            raise ValidationError(_("All available pricelists must be in the same currency as the company or"
                                    " as the Sales Journal set on this point of sale if you use"
                                    " the Accounting application."))
        if self.invoice_journal_id.currency_id and self.invoice_journal_id.currency_id != self.currency_id:
            raise ValidationError(_("The invoice journal must be in the same currency as the Sales Journal or the company currency if that is not set."))
        if any(
            self.payment_method_ids\
                .filtered(lambda pm: pm.is_cash_count)\
                .mapped(lambda pm: self.currency_id not in (self.company_id.currency_id | pm.cash_journal_id.currency_id))
        ):
            raise ValidationError(_("All payment methods must be in the same currency as the Sales Journal or the company currency if that is not set."))

    @api.constrains('company_id', 'available_pricelist_ids')
    def _check_companies(self):
        if any(self.available_pricelist_ids.mapped(lambda pl: pl.company_id.id not in (False, self.company_id.id))):
            raise ValidationError(_("The selected pricelists must belong to no company or the company of the point of sale."))

    @api.onchange('iface_tipproduct')
    def _onchange_tipproduct(self):
        if self.iface_tipproduct:
            self.tip_product_id = self.env.ref('point_of_sale.product_product_tip', False)
        else:
            self.tip_product_id = False

    @api.onchange('iface_print_via_proxy')
    def _onchange_iface_print_via_proxy(self):
        self.iface_print_auto = self.iface_print_via_proxy

    @api.onchange('module_account')
    def _onchange_module_account(self):
        if self.module_account and not self.invoice_journal_id:
            self.invoice_journal_id = self._default_invoice_journal()

    @api.onchange('use_pricelist')
    def _onchange_use_pricelist(self):
        """
        If the 'pricelist' box is unchecked, we reset the pricelist_id to stop
        using a pricelist for this iotbox.
        """
        if not self.use_pricelist:
            self.pricelist_id = self._default_pricelist()

    @api.onchange('available_pricelist_ids')
    def _onchange_available_pricelist_ids(self):
        if self.pricelist_id not in self.available_pricelist_ids._origin:
            self.pricelist_id = False

    @api.onchange('is_posbox')
    def _onchange_is_posbox(self):
        if not self.is_posbox:
            self.proxy_ip = False
            self.iface_scan_via_proxy = False
            self.iface_electronic_scale = False
            self.iface_cashdrawer = False
            self.iface_print_via_proxy = False
            self.iface_customer_facing_display = False

    @api.onchange('tax_regime')
    def _onchange_tax_regime(self):
        if not self.tax_regime:
            self.default_fiscal_position_id = False

    @api.onchange('tax_regime_selection')
    def _onchange_tax_regime_selection(self):
        if not self.tax_regime_selection:
            self.fiscal_position_ids = [(5, 0, 0)]

    @api.onchange('start_category')
    def _onchange_start_category(self):
        if not self.start_category:
            self.iface_start_categ_id = False

    @api.onchange('limit_categories', 'iface_available_categ_ids', 'iface_start_categ_id')
    def _onchange_limit_categories(self):
        res = {}
        if not self.limit_categories:
            self.iface_available_categ_ids = False
        if self.iface_available_categ_ids and self.iface_start_categ_id.id not in self.iface_available_categ_ids.ids:
            self.iface_start_categ_id = False
        return res

    @api.onchange('is_header_or_footer')
    def _onchange_header_footer(self):
        if not self.is_header_or_footer:
            self.receipt_header = False
            self.receipt_footer = False

    def name_get(self):
        result = []
        for config in self:
            last_session = self.env['pos.session'].search([('config_id', '=', config.id)], limit=1)
            if (not last_session) or (last_session.state == 'closed'):
                result.append((config.id, config.name + ' (' + _('not used') + ')'))
                continue
            result.append((config.id, config.name + ' (' + last_session.user_id.name + ')'))
        return result

    @api.model
    def create(self, values):
        IrSequence = self.env['ir.sequence'].sudo()
        val = {
            'name': _('POS Order %s') % values['name'],
            'padding': 4,
            'prefix': "%s/" % values['name'],
            'code': "pos.order",
            'company_id': values.get('company_id', False),
        }
        # force sequence_id field to new pos.order sequence
        values['sequence_id'] = IrSequence.create(val).id

        val.update(name=_('POS order line %s') % values['name'], code='pos.order.line')
        values['sequence_line_id'] = IrSequence.create(val).id
        pos_config = super(PosConfig, self).create(values)
        pos_config.sudo()._check_modules_to_install()
        pos_config.sudo()._check_groups_implied()
        # If you plan to add something after this, use a new environment. The one above is no longer valid after the modules install.
        return pos_config

    def write(self, vals):
        opened_session = self.mapped('session_ids').filtered(lambda s: s.state != 'closed')
        if opened_session:
            raise UserError(_('Unable to modify this PoS Configuration because there is an open PoS Session based on it.'))
        result = super(PosConfig, self).write(vals)

        self.sudo()._set_fiscal_position()
        self.sudo()._check_modules_to_install()
        self.sudo()._check_groups_implied()
        return result

    def unlink(self):
        # Delete the pos.config records first then delete the sequences linked to them
        sequences_to_delete = self.sequence_id | self.sequence_line_id
        res = super(PosConfig, self).unlink()
        sequences_to_delete.unlink()
        return res

    def _set_fiscal_position(self):
        for config in self:
            if config.tax_regime and config.default_fiscal_position_id.id not in config.fiscal_position_ids.ids:
                config.fiscal_position_ids = [(4, config.default_fiscal_position_id.id)]
            elif not config.tax_regime_selection and not config.tax_regime and config.fiscal_position_ids.ids:
                config.fiscal_position_ids = [(5, 0, 0)]

    def _check_modules_to_install(self):
        # determine modules to install
        expected = [
            fname[7:]           # 'module_account' -> 'account'
            for fname in self.fields_get_keys()
            if fname.startswith('module_')
            if any(pos_config[fname] for pos_config in self)
        ]
        if expected:
            STATES = ('installed', 'to install', 'to upgrade')
            modules = self.env['ir.module.module'].sudo().search([('name', 'in', expected)])
            modules = modules.filtered(lambda module: module.state not in STATES)
            if modules:
                modules.button_immediate_install()
                # just in case we want to do something if we install a module. (like a refresh ...)
                return True
        return False

    def _check_groups_implied(self):
        for pos_config in self:
            for field_name in [f for f in pos_config.fields_get_keys() if f.startswith('group_')]:
                field = pos_config._fields[field_name]
                if field.type in ('boolean', 'selection') and hasattr(field, 'implied_group'):
                    field_group_xmlids = getattr(field, 'group', 'base.group_user').split(',')
                    field_groups = self.env['res.groups'].concat(*(self.env.ref(it) for it in field_group_xmlids))
                    field_groups.write({'implied_ids': [(4, self.env.ref(field.implied_group).id)]})


    def execute(self):
        return {
             'type': 'ir.actions.client',
             'tag': 'reload',
             'params': {'wait': True}
         }

    # Methods to open the POS
    def open_ui(self):
        """Open the pos interface with config_id as an extra argument.
    
        In vanilla PoS each user can only have one active session, therefore it was not needed to pass the config_id
        on opening a session. It is also possible to login to sessions created by other users.
        
        :returns: dict
        """
        self.ensure_one()
        # check all constraints, raises if any is not met
        self._validate_fields(set(self._fields) - {"cash_control"})
        return {
            'type': 'ir.actions.act_url',
            'url':   '/pos/web?config_id=%d' % self.id,
            'target': 'self',
        }

    def open_session_cb(self):
        """ new session button

        create one if none exist
        access cash control interface if enabled or start a session
        """
        self.ensure_one()
        if not self.current_session_id:
            if not self.company_has_template:
                raise UserError(_("A Chart of Accounts is not yet installed in your current company. Please install a "
                                  "Chart of Accounts through the Invoicing/Accounting settings before launching a PoS session." ))
            self._check_company_journal()
            self._check_company_invoice_journal()
            self._check_company_payment()
            self._check_currencies()
            self.env['pos.session'].create({
                'user_id': self.env.uid,
                'config_id': self.id
            })
            if self.current_session_id.state == 'opened':
                return self.open_ui()
        return self._open_session(self.current_session_id.id)

    def open_existing_session_cb(self):
        """ close session button

        access session form to validate entries
        """
        self.ensure_one()
        return self._open_session(self.current_session_id.id)

    def _open_session(self, session_id):
        return {
            'name': _('Session'),
            'view_mode': 'form,tree',
            'res_model': 'pos.session',
            'res_id': session_id,
            'view_id': False,
            'type': 'ir.actions.act_window',
        }

    # All following methods are made to create data needed in POS, when a localisation
    # is installed, or if POS is installed on database having companies that already have
    # a localisation installed
    @api.model
    def post_install_pos_localisation(self):
        self.assign_payment_journals()
        self.generate_pos_journal()

    @api.model
    def assign_payment_journals(self, companies=False):
        self = self.sudo()
        if not companies:
            companies = self.env['res.company'].search([])
        for company in companies:
            if company.chart_template_id:
                cash_journal = self.env['account.journal'].search([('company_id', '=', company.id), ('type', '=', 'cash')], limit=1)
                pos_receivable_account = company.account_default_pos_receivable_account_id
                payment_methods = self.env['pos.payment.method']
                if cash_journal:
                    payment_methods |= payment_methods.create({
                        'name': _('Cash'),
                        'receivable_account_id': pos_receivable_account.id,
                        'is_cash_count': True,
                        'cash_journal_id': cash_journal.id,
                        'company_id': company.id,
                    })
                payment_methods |= payment_methods.create({
                    'name': _('Bank'),
                    'receivable_account_id': pos_receivable_account.id,
                    'is_cash_count': False,
                    'company_id': company.id,
                })
                existing_pos_config = self.env['pos.config'].search([('company_id', '=', company.id), ('payment_method_ids', '=', False)])
                existing_pos_config.write({'payment_method_ids': [(6, 0, payment_methods.ids)]})

    @api.model
    def generate_pos_journal(self, companies=False):
        self = self.sudo()
        if not companies:
            companies = self.env['res.company'].search([])
        for company in companies:
            pos_journal = self.env['account.journal'].search([('company_id', '=', company.id), ('code', '=', 'POSS')])
            if company.chart_template_id and not pos_journal:
                pos_journal = self.env['account.journal'].create({
                    'type': 'sale',
                    'name': 'Point of Sale',
                    'code': 'POSS',
                    'company_id': company.id,
                    'sequence': 20
                })
                existing_pos_config = self.env['pos.config'].search([('company_id', '=', company.id), ('journal_id', '=', False)])
                existing_pos_config.write({'journal_id': pos_journal.id})
