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

import psycopg2
import pytz

from odoo import api, fields, models, tools, _
from odoo.tools import float_is_zero, float_round
from odoo.exceptions import ValidationError, UserError
from odoo.http import request
from odoo.osv.expression import AND
import base64

_logger = logging.getLogger(__name__)


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

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

    @api.model
    def _order_fields(self, ui_order):
        process_line = partial(self.env['pos.order.line']._order_line_fields, session_id=ui_order['pos_session_id'])
        return {
            'user_id':      ui_order['user_id'] or False,
            'session_id':   ui_order['pos_session_id'],
            'lines':        [process_line(l) for l in ui_order['lines']] if ui_order['lines'] else False,
            'pos_reference': ui_order['name'],
            'sequence_number': ui_order['sequence_number'],
            'partner_id':   ui_order['partner_id'] or False,
            'date_order':   ui_order['creation_date'].replace('T', ' ')[:19],
            'fiscal_position_id': ui_order['fiscal_position_id'],
            'pricelist_id': ui_order['pricelist_id'],
            'amount_paid':  ui_order['amount_paid'],
            'amount_total':  ui_order['amount_total'],
            'amount_tax':  ui_order['amount_tax'],
            'amount_return':  ui_order['amount_return'],
            'company_id': self.env['pos.session'].browse(ui_order['pos_session_id']).company_id.id,
            'to_invoice': ui_order['to_invoice'] if "to_invoice" in ui_order else False,
            'is_tipped': ui_order.get('is_tipped', False),
            'tip_amount': ui_order.get('tip_amount', 0),
        }

    @api.model
    def _payment_fields(self, order, ui_paymentline):
        return {
            'amount': ui_paymentline['amount'] or 0.0,
            'payment_date': ui_paymentline['name'],
            'payment_method_id': ui_paymentline['payment_method_id'],
            'card_type': ui_paymentline.get('card_type'),
            'cardholder_name': ui_paymentline.get('cardholder_name'),
            'transaction_id': ui_paymentline.get('transaction_id'),
            'payment_status': ui_paymentline.get('payment_status'),
            'pos_order_id': order.id,
        }

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

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

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

        return new_session


    @api.model
    def _process_order(self, order, draft, existing_order):
        """Create or update an pos.order from a given dictionary.

        :param dict order: dictionary representing the order.
        :param bool draft: Indicate that the pos_order is not validated yet.
        :param existing_order: order to be updated or False.
        :type existing_order: pos.order.
        :returns: id of created/updated pos.order
        :rtype: int
        """
        order = order['data']
        pos_session = self.env['pos.session'].browse(order['pos_session_id'])
        if pos_session.state == 'closing_control' or pos_session.state == 'closed':
            order['pos_session_id'] = self._get_valid_session(order).id

        pos_order = False
        if not existing_order:
            pos_order = self.create(self._order_fields(order))
        else:
            pos_order = existing_order
            pos_order.lines.unlink()
            order['user_id'] = pos_order.user_id.id
            pos_order.write(self._order_fields(order))

        pos_order = pos_order.with_company(pos_order.company_id)
        self = self.with_company(pos_order.company_id)
        self._process_payment_lines(order, pos_order, pos_session, draft)

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

        pos_order._create_order_picking()
        if pos_order.to_invoice and pos_order.state == 'paid':
            pos_order.action_pos_order_invoice()

        return pos_order.id


    def _process_payment_lines(self, pos_order, order, pos_session, draft):
        """Create account.bank.statement.lines from the dictionary given to the parent function.

        If the payment_line is an updated version of an existing one, the existing payment_line will first be
        removed before making a new one.
        :param pos_order: dictionary representing the order.
        :type pos_order: dict.
        :param order: Order object the payment lines should belong to.
        :type order: pos.order
        :param pos_session: PoS session the order was created in.
        :type pos_session: pos.session
        :param draft: Indicate that the pos_order is not validated yet.
        :type draft: bool.
        """
        prec_acc = order.pricelist_id.currency_id.decimal_places

        order_bank_statement_lines= self.env['pos.payment'].search([('pos_order_id', '=', order.id)])
        order_bank_statement_lines.unlink()
        for payments in pos_order['statement_ids']:
            if not float_is_zero(payments[2]['amount'], precision_digits=prec_acc):
                order.add_payment(self._payment_fields(order, payments[2]))

        order.amount_paid = sum(order.payment_ids.mapped('amount'))

        if not draft and not float_is_zero(pos_order['amount_return'], prec_acc):
            cash_payment_method = pos_session.payment_method_ids.filtered('is_cash_count')[:1]
            if not cash_payment_method:
                raise UserError(_("No cash statement found for this session. Unable to record returned cash."))
            return_payment_vals = {
                'name': _('return'),
                'pos_order_id': order.id,
                'amount': -pos_order['amount_return'],
                'payment_date': fields.Datetime.now(),
                'payment_method_id': cash_payment_method.id,
                'is_change': True,
            }
            order.add_payment(return_payment_vals)

    def _prepare_invoice_line(self, order_line):
        return {
            'product_id': order_line.product_id.id,
            'quantity': order_line.qty if self.amount_total >= 0 else -order_line.qty,
            'discount': order_line.discount,
            'price_unit': order_line.price_unit,
            'name': order_line.product_id.display_name,
            'tax_ids': [(6, 0, order_line.tax_ids_after_fiscal_position.ids)],
            'product_uom_id': order_line.product_uom_id.id,
        }

    def _get_pos_anglo_saxon_price_unit(self, product, partner_id, quantity):
        moves = self.filtered(lambda o: o.partner_id.id == partner_id)\
            .mapped('picking_ids.move_lines')\
            .filtered(lambda m: m.product_id.id == product.id)\
            .sorted(lambda x: x.date)
        price_unit = product._compute_average_price(0, quantity, moves)
        return price_unit

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

    session_id = fields.Many2one(
        'pos.session', string='Session', required=True, index=True,
        domain="[('state', '=', 'opened')]", states={'draft': [('readonly', False)]},
        readonly=True)
    config_id = fields.Many2one('pos.config', related='session_id.config_id', string="Point of Sale", readonly=False)
    currency_id = fields.Many2one('res.currency', related='config_id.currency_id', string="Currency")
    currency_rate = fields.Float("Currency Rate", compute='_compute_currency_rate', compute_sudo=True, store=True, digits=0, readonly=True,
        help='The rate of the currency to the currency of rate applicable at the date of the order')

    invoice_group = fields.Boolean(related="config_id.module_account", readonly=False)
    state = fields.Selection(
        [('draft', 'New'), ('cancel', 'Cancelled'), ('paid', 'Paid'), ('done', 'Posted'), ('invoiced', 'Invoiced')],
        'Status', readonly=True, copy=False, default='draft')

    account_move = fields.Many2one('account.move', string='Invoice', readonly=True, copy=False)
    picking_ids = fields.One2many('stock.picking', 'pos_order_id')
    picking_count = fields.Integer(compute='_compute_picking_count')
    failed_pickings = fields.Boolean(compute='_compute_picking_count')
    picking_type_id = fields.Many2one('stock.picking.type', related='session_id.config_id.picking_type_id', string="Operation Type", readonly=False)

    note = fields.Text(string='Internal Notes')
    nb_print = fields.Integer(string='Number of Print', readonly=True, copy=False, default=0)
    pos_reference = fields.Char(string='Receipt Number', readonly=True, copy=False)
    sale_journal = fields.Many2one('account.journal', related='session_id.config_id.journal_id', string='Sales Journal', store=True, readonly=True, ondelete='restrict')
    fiscal_position_id = fields.Many2one(
        comodel_name='account.fiscal.position', string='Fiscal Position',
        readonly=True,
        states={'draft': [('readonly', False)]},
    )
    payment_ids = fields.One2many('pos.payment', 'pos_order_id', string='Payments', readonly=True)
    session_move_id = fields.Many2one('account.move', string='Session Journal Entry', related='session_id.move_id', readonly=True, copy=False)
    to_invoice = fields.Boolean('To invoice')
    is_invoiced = fields.Boolean('Is Invoiced', compute='_compute_is_invoiced')
    is_tipped = fields.Boolean('Is this already tipped?', readonly=True)
    tip_amount = fields.Float(string='Tip Amount', digits=0, readonly=True)

    @api.depends('account_move')
    def _compute_is_invoiced(self):
        for order in self:
            order.is_invoiced = bool(order.account_move)

    @api.depends('picking_ids', 'picking_ids.state')
    def _compute_picking_count(self):
        for order in self:
            order.picking_count = len(order.picking_ids)
            order.failed_pickings = bool(order.picking_ids.filtered(lambda p: p.state != 'done'))

    @api.depends('date_order', 'company_id', 'currency_id', 'company_id.currency_id')
    def _compute_currency_rate(self):
        for order in self:
            order.currency_rate = self.env['res.currency']._get_conversion_rate(order.company_id.currency_id, order.currency_id, order.company_id, order.date_order)

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

    def _compute_batch_amount_all(self):
        """
        Does essentially the same thing as `_onchange_amount_all` but only for actually existing records
        It is intended as a helper method , not as a business one
        Practical to be used for migrations
        """
        amounts = {order_id: {'paid': 0, 'return': 0, 'taxed': 0, 'taxes': 0} for order_id in self.ids}
        for order in self.env['pos.payment'].read_group([('pos_order_id', 'in', self.ids)], ['pos_order_id', 'amount'], ['pos_order_id']):
            amounts[order['pos_order_id'][0]]['paid'] = order['amount']
        for order in self.env['pos.payment'].read_group(['&', ('pos_order_id', 'in', self.ids), ('amount', '<', 0)], ['pos_order_id', 'amount'], ['pos_order_id']):
            amounts[order['pos_order_id'][0]]['return'] = order['amount']
        for order in self.env['pos.order.line'].read_group([('order_id', 'in', self.ids)], ['order_id', 'price_subtotal', 'price_subtotal_incl'], ['order_id']):
            amounts[order['order_id'][0]]['taxed'] = order['price_subtotal_incl']
            amounts[order['order_id'][0]]['taxes'] = order['price_subtotal_incl'] - order['price_subtotal']

        for order in self:
            currency = order.pricelist_id.currency_id
            order.write({
                'amount_paid': amounts[order.id]['paid'],
                'amount_return': amounts[order.id]['return'],
                'amount_tax': currency.round(amounts[order.id]['taxes']),
                'amount_total': currency.round(amounts[order.id]['taxed'])
            })

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

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

    @api.model
    def create(self, values):
        session = self.env['pos.session'].browse(values['session_id'])
        values = self._complete_values_from_session(session, values)
        return super(PosOrder, self).create(values)

    @api.model
    def _complete_values_from_session(self, session, values):
        if values.get('state') and values['state'] == 'paid':
            values['name'] = session.config_id.sequence_id._next()
        values.setdefault('pricelist_id', session.config_id.pricelist_id.id)
        values.setdefault('fiscal_position_id', session.config_id.default_fiscal_position_id.id)
        values.setdefault('company_id', session.config_id.company_id.id)
        return values

    def write(self, vals):
        for order in self:
            if vals.get('state') and vals['state'] == 'paid' and order.name == '/':
                vals['name'] = order.config_id.sequence_id._next()
        return super(PosOrder, self).write(vals)

    def action_stock_picking(self):
        self.ensure_one()
        action = self.env['ir.actions.act_window']._for_xml_id('stock.action_picking_tree_ready')
        action['context'] = {}
        action['domain'] = [('id', 'in', self.picking_ids.ids)]
        return action

    def action_view_invoice(self):
        return {
            'name': _('Customer Invoice'),
            'view_mode': 'form',
            'view_id': self.env.ref('account.view_move_form').id,
            'res_model': 'account.move',
            'context': "{'move_type':'out_invoice'}",
            'type': 'ir.actions.act_window',
            'res_id': self.account_move.id,
        }

    def _is_pos_order_paid(self):
        return float_is_zero(self._get_rounded_amount(self.amount_total) - self.amount_paid, precision_rounding=self.currency_id.rounding)

    def _get_rounded_amount(self, amount):
        if self.config_id.cash_rounding:
            amount = float_round(amount, precision_rounding=self.config_id.rounding_method.rounding, rounding_method=self.config_id.rounding_method.rounding_method)
        currency = self.currency_id
        return currency.round(amount) if currency else amount

    def action_pos_order_paid(self):
        self.ensure_one()

        if not self.config_id.cash_rounding:
            total = self.amount_total
        else:
            total = float_round(self.amount_total, precision_rounding=self.config_id.rounding_method.rounding, rounding_method=self.config_id.rounding_method.rounding_method)

        if not float_is_zero(total - self.amount_paid, precision_rounding=self.currency_id.rounding):
            raise UserError(_("Order %s is not fully paid.", self.name))

        self.write({'state': 'paid'})

        return True

    def _prepare_invoice_vals(self):
        self.ensure_one()
        timezone = pytz.timezone(self._context.get('tz') or self.env.user.tz or 'UTC')
        vals = {
            'payment_reference': self.name,
            'invoice_origin': self.name,
            'journal_id': self.session_id.config_id.invoice_journal_id.id,
            'move_type': 'out_invoice' if self.amount_total >= 0 else 'out_refund',
            'ref': self.name,
            'partner_id': self.partner_id.id,
            'narration': self.note or '',
            # considering partner's sale pricelist's currency
            'currency_id': self.pricelist_id.currency_id.id,
            'invoice_user_id': self.user_id.id,
            'invoice_date': self.date_order.astimezone(timezone).date(),
            'fiscal_position_id': self.fiscal_position_id.id,
            'invoice_line_ids': [(0, None, self._prepare_invoice_line(line)) for line in self.lines],
            'invoice_cash_rounding_id': self.config_id.rounding_method.id if self.config_id.cash_rounding else False
        }
        return vals

    def action_pos_order_invoice(self):
        moves = self.env['account.move']

        for order in self:
            # Force company for all SUPERUSER_ID action
            if order.account_move:
                moves += order.account_move
                continue

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

            move_vals = order._prepare_invoice_vals()
            new_move = moves.sudo()\
                            .with_company(order.company_id)\
                            .with_context(default_move_type=move_vals['move_type'])\
                            .create(move_vals)
            message = _("This invoice has been created from the point of sale session: <a href=# data-oe-model=pos.order data-oe-id=%d>%s</a>") % (order.id, order.name)
            new_move.message_post(body=message)
            order.write({'account_move': new_move.id, 'state': 'invoiced'})
            new_move.sudo().with_company(order.company_id)._post()
            moves += new_move

        if not moves:
            return {}

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

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

    @api.model
    def create_from_ui(self, orders, draft=False):
        """ Create and update Orders from the frontend PoS application.

        Create new orders and update orders that are in draft status. If an order already exists with a status
        diferent from 'draft'it will be discareded, otherwise it will be saved to the database. If saved with
        'draft' status the order can be overwritten later by this function.

        :param orders: dictionary with the orders to be created.
        :type orders: dict.
        :param draft: Indicate if the orders are ment to be finalised or temporarily saved.
        :type draft: bool.
        :Returns: list -- list of db-ids for the created and updated orders.
        """
        order_ids = []
        for order in orders:
            existing_order = False
            if 'server_id' in order['data']:
                existing_order = self.env['pos.order'].search(['|', ('id', '=', order['data']['server_id']), ('pos_reference', '=', order['data']['name'])], limit=1)
            if (existing_order and existing_order.state == 'draft') or not existing_order:
                order_ids.append(self._process_order(order, draft, existing_order))

        return self.env['pos.order'].search_read(domain = [('id', 'in', order_ids)], fields = ['id', 'pos_reference'])

    def _create_order_picking(self):
        self.ensure_one()
        if not self.session_id.update_stock_at_closing or (self.company_id.anglo_saxon_accounting and self.to_invoice):
            picking_type = self.config_id.picking_type_id
            if self.partner_id.property_stock_customer:
                destination_id = self.partner_id.property_stock_customer.id
            elif not picking_type or not picking_type.default_location_dest_id:
                destination_id = self.env['stock.warehouse']._get_partner_locations()[0].id
            else:
                destination_id = picking_type.default_location_dest_id.id

            pickings = self.env['stock.picking']._create_picking_from_pos_order_lines(destination_id, self.lines, picking_type, self.partner_id)
            pickings.write({'pos_session_id': self.session_id.id, 'pos_order_id': self.id, 'origin': self.name})

    def add_payment(self, data):
        """Create a new payment for the order"""
        self.ensure_one()
        self.env['pos.payment'].create(data)
        self.amount_paid = sum(self.payment_ids.mapped('amount'))

    def _prepare_refund_values(self, current_session):
        self.ensure_one()
        return {
            'name': self.name + _(' REFUND'),
            'session_id': current_session.id,
            'date_order': fields.Datetime.now(),
            'pos_reference': self.pos_reference,
            'lines': False,
            'amount_tax': -self.amount_tax,
            'amount_total': -self.amount_total,
            'amount_paid': 0,
        }

    def refund(self):
        """Create a copy of order  for refund order"""
        refund_orders = self.env['pos.order']
        for order in self:
            # When a refund is performed, we are creating it in a session having the same config as the original
            # order. It can be the same session, or if it has been closed the new one that has been opened.
            current_session = order.session_id.config_id.current_session_id
            if not current_session:
                raise UserError(_('To return product(s), you need to open a session in the POS %s', order.session_id.config_id.display_name))
            refund_order = order.copy(
                order._prepare_refund_values(current_session)
            )
            for line in order.lines:
                PosOrderLineLot = self.env['pos.pack.operation.lot']
                for pack_lot in line.pack_lot_ids:
                    PosOrderLineLot += pack_lot.copy()
                line.copy(line._prepare_refund_data(refund_order, PosOrderLineLot))
            refund_orders |= refund_order

        return {
            'name': _('Return Products'),
            'view_mode': 'form',
            'res_model': 'pos.order',
            'res_id': refund_orders.ids[0],
            'view_id': False,
            'context': self.env.context,
            'type': 'ir.actions.act_window',
            'target': 'current',
        }

    def action_receipt_to_customer(self, name, client, ticket):
        if not self:
            return False
        if not client.get('email'):
            return False

        message = _("<p>Dear %s,<br/>Here is your electronic ticket for the %s. </p>") % (client['name'], name)
        filename = 'Receipt-' + name + '.jpg'
        receipt = self.env['ir.attachment'].create({
            'name': filename,
            'type': 'binary',
            'datas': ticket,
            'res_model': 'pos.order',
            'res_id': self.ids[0],
            'store_fname': filename,
            'mimetype': 'image/jpeg',
        })
        mail_values = {
            'subject': _('Receipt %s', name),
            'body_html': message,
            'author_id': self.env.user.partner_id.id,
            'email_from': self.env.company.email or self.env.user.email_formatted,
            'email_to': client['email'],
            'attachment_ids': [(4, receipt.id)],
        }

        if self.mapped('account_move'):
            report = self.env.ref('point_of_sale.pos_invoice_report')._render_qweb_pdf(self.ids[0])
            filename = name + '.pdf'
            attachment = self.env['ir.attachment'].create({
                'name': filename,
                'type': 'binary',
                'datas': base64.b64encode(report[0]),
                'store_fname': filename,
                'res_model': 'pos.order',
                'res_id': self.ids[0],
                'mimetype': 'application/x-pdf'
            })
            mail_values['attachment_ids'] += [(4, attachment.id)]

        mail = self.env['mail.mail'].sudo().create(mail_values)
        mail.send()

    @api.model
    def remove_from_ui(self, server_ids):
        """ Remove orders from the frontend PoS application

        Remove orders from the server by id.
        :param server_ids: list of the id's of orders to remove from the server.
        :type server_ids: list.
        :returns: list -- list of db-ids for the removed orders.
        """
        orders = self.search([('id', 'in', server_ids),('state', '=', 'draft')])
        orders.write({'state': 'cancel'})
        # TODO Looks like delete cascade is a better solution.
        orders.mapped('payment_ids').sudo().unlink()
        orders.sudo().unlink()
        return orders.ids

    @api.model
    def search_paid_order_ids(self, config_id, domain, limit, offset):
        """Search for 'paid' orders that satisfy the given domain, limit and offset."""
        default_domain = ['&', ('config_id', '=', config_id), '!', '|', ('state', '=', 'draft'), ('state', '=', 'cancelled')]
        real_domain = AND([domain, default_domain])
        ids = self.search(AND([domain, default_domain]), limit=limit, offset=offset).ids
        totalCount = self.search_count(real_domain)
        return {'ids': ids, 'totalCount': totalCount}

    def _export_for_ui(self, order):
        timezone = pytz.timezone(self._context.get('tz') or self.env.user.tz or 'UTC')
        return {
            'lines': [[0, 0, line] for line in order.lines.export_for_ui()],
            'statement_ids': [[0, 0, payment] for payment in order.payment_ids.export_for_ui()],
            'name': order.pos_reference,
            'uid': order.pos_reference[6:],
            'amount_paid': order.amount_paid,
            'amount_total': order.amount_total,
            'amount_tax': order.amount_tax,
            'amount_return': order.amount_return,
            'pos_session_id': order.session_id.id,
            'is_session_closed': order.session_id.state == 'closed',
            'pricelist_id': order.pricelist_id.id,
            'partner_id': order.partner_id.id,
            'user_id': order.user_id.id,
            'sequence_number': order.sequence_number,
            'creation_date': order.date_order.astimezone(timezone),
            'fiscal_position_id': order.fiscal_position_id.id,
            'to_invoice': order.to_invoice,
            'state': order.state,
            'account_move': order.account_move.id,
            'id': order.id,
            'is_tipped': order.is_tipped,
            'tip_amount': order.tip_amount,
        }

    def export_for_ui(self):
        """ Returns a list of dict with each item having similar signature as the return of
            `export_as_JSON` of models.Order. This is useful for back-and-forth communication
            between the pos frontend and backend.
        """
        return self.mapped(self._export_for_ui) if self else []


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

    def _order_line_fields(self, line, session_id=None):
        if line and 'name' not in line[2]:
            session = self.env['pos.session'].browse(session_id).exists() if session_id else None
            if session and session.config_id.sequence_line_id:
                # set name based on the sequence specified on the config
                line[2]['name'] = session.config_id.sequence_line_id._next()
            else:
                # fallback on any pos.order.line sequence
                line[2]['name'] = self.env['ir.sequence'].next_by_code('pos.order.line')

        if line and 'tax_ids' not in line[2]:
            product = self.env['product.product'].browse(line[2]['product_id'])
            line[2]['tax_ids'] = [(6, 0, [x.id for x in product.taxes_id])]
        # Clean up fields sent by the JS
        line = [
            line[0], line[1], {k: v for k, v in line[2].items() if k in self.env['pos.order.line']._fields}
        ]
        return line

    company_id = fields.Many2one('res.company', string='Company', related="order_id.company_id", store=True)
    name = fields.Char(string='Line No', required=True, copy=False)
    notice = fields.Char(string='Discount Notice')
    product_id = fields.Many2one('product.product', string='Product', domain=[('sale_ok', '=', True)], required=True, change_default=True)
    price_unit = fields.Float(string='Unit Price', digits=0)
    qty = fields.Float('Quantity', digits='Product Unit of Measure', default=1)
    price_subtotal = fields.Float(string='Subtotal w/o Tax', digits=0,
        readonly=True, required=True)
    price_subtotal_incl = fields.Float(string='Subtotal', digits=0,
        readonly=True, required=True)
    discount = fields.Float(string='Discount (%)', digits=0, default=0.0)
    order_id = fields.Many2one('pos.order', string='Order Ref', ondelete='cascade', required=True)
    tax_ids = fields.Many2many('account.tax', string='Taxes', readonly=True)
    tax_ids_after_fiscal_position = fields.Many2many('account.tax', compute='_get_tax_ids_after_fiscal_position', string='Taxes to Apply')
    pack_lot_ids = fields.One2many('pos.pack.operation.lot', 'pos_order_line_id', string='Lot/serial Number')
    product_uom_id = fields.Many2one('uom.uom', string='Product UoM', related='product_id.uom_id')
    currency_id = fields.Many2one('res.currency', related='order_id.currency_id')
    full_product_name = fields.Char('Full Product Name')

    def _prepare_refund_data(self, refund_order, PosOrderLineLot):
        """
        This prepares data for refund order line. Inheritance may inject more data here

        @param refund_order: the pre-created refund order
        @type refund_order: pos.order

        @param PosOrderLineLot: the pre-created Pack operation Lot
        @type PosOrderLineLot: pos.pack.operation.lot

        @return: dictionary of data which is for creating a refund order line from the original line
        @rtype: dict
        """
        self.ensure_one()
        return {
            'name': self.name + _(' REFUND'),
            'qty': -self.qty,
            'order_id': refund_order.id,
            'price_subtotal': -self.price_subtotal,
            'price_subtotal_incl': -self.price_subtotal_incl,
            'pack_lot_ids': PosOrderLineLot,
        }

    @api.model
    def create(self, values):
        if values.get('order_id') and not values.get('name'):
            # set name based on the sequence specified on the config
            config = self.env['pos.order'].browse(values['order_id']).session_id.config_id
            if config.sequence_line_id:
                values['name'] = config.sequence_line_id._next()
        if not values.get('name'):
            # fallback on any pos.order sequence
            values['name'] = self.env['ir.sequence'].next_by_code('pos.order.line')
        return super(PosOrderLine, self).create(values)

    def write(self, values):
        if values.get('pack_lot_line_ids'):
            for pl in values.get('pack_lot_ids'):
                if pl[2].get('server_id'):
                    pl[2]['id'] = pl[2]['server_id']
                    del pl[2]['server_id']
        return super().write(values)

    @api.onchange('price_unit', 'tax_ids', 'qty', 'discount', 'product_id')
    def _onchange_amount_line_all(self):
        for line in self:
            res = line._compute_amount_line_all()
            line.update(res)

    def _compute_amount_line_all(self):
        self.ensure_one()
        fpos = self.order_id.fiscal_position_id
        tax_ids_after_fiscal_position = fpos.map_tax(self.tax_ids, self.product_id, self.order_id.partner_id)
        price = self.price_unit * (1 - (self.discount or 0.0) / 100.0)
        taxes = tax_ids_after_fiscal_position.compute_all(price, self.order_id.pricelist_id.currency_id, self.qty, product=self.product_id, partner=self.order_id.partner_id)
        return {
            'price_subtotal_incl': taxes['total_included'],
            'price_subtotal': taxes['total_excluded'],
        }

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

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

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

    def _export_for_ui(self, orderline):
        return {
            'qty': orderline.qty,
            'price_unit': orderline.price_unit,
            'price_subtotal': orderline.price_subtotal,
            'price_subtotal_incl': orderline.price_subtotal_incl,
            'product_id': orderline.product_id.id,
            'discount': orderline.discount,
            'tax_ids': [[6, False, orderline.tax_ids.mapped(lambda tax: tax.id)]],
            'id': orderline.id,
            'pack_lot_ids': [[0, 0, lot] for lot in orderline.pack_lot_ids.export_for_ui()],
        }

    def export_for_ui(self):
        return self.mapped(self._export_for_ui) if self else []


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

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

    def _export_for_ui(self, lot):
        return {
            'lot_name': lot.lot_name,
        }

    def export_for_ui(self):
        return self.mapped(self._export_for_ui) if self else []

class ReportSaleDetails(models.AbstractModel):

    _name = 'report.point_of_sale.report_saledetails'
    _description = 'Point of Sale Details'


    @api.model
    def get_sale_details(self, date_start=False, date_stop=False, config_ids=False, session_ids=False):
        """ Serialise the orders of the requested time period, configs and sessions.

        :param date_start: The dateTime to start, default today 00:00:00.
        :type date_start: str.
        :param date_stop: The dateTime to stop, default date_start + 23:59:59.
        :type date_stop: str.
        :param config_ids: Pos Config id's to include.
        :type config_ids: list of numbers.
        :param session_ids: Pos Config id's to include.
        :type session_ids: list of numbers.

        :returns: dict -- Serialised sales.
        """
        domain = [('state', 'in', ['paid','invoiced','done'])]

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

            if date_stop:
                date_stop = fields.Datetime.from_string(date_stop)
                # avoid a date_stop smaller than date_start
                if (date_stop < date_start):
                    date_stop = date_start + timedelta(days=1, seconds=-1)
            else:
                # stop by default today 23:59:59
                date_stop = date_start + timedelta(days=1, seconds=-1)

            domain = AND([domain,
                [('date_order', '>=', fields.Datetime.to_string(date_start)),
                ('date_order', '<=', fields.Datetime.to_string(date_stop))]
            ])

            if config_ids:
                domain = AND([domain, [('config_id', 'in', config_ids)]])

        orders = self.env['pos.order'].search(domain)

        user_currency = self.env.company.currency_id

        total = 0.0
        products_sold = {}
        taxes = {}
        for order in orders:
            if user_currency != order.pricelist_id.currency_id:
                total += order.pricelist_id.currency_id._convert(
                    order.amount_total, user_currency, order.company_id, order.date_order or fields.Date.today())
            else:
                total += order.amount_total
            currency = order.session_id.currency_id

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

                if line.tax_ids_after_fiscal_position:
                    line_taxes = line.tax_ids_after_fiscal_position.compute_all(line.price_unit * (1-(line.discount or 0.0)/100.0), currency, line.qty, product=line.product_id, partner=line.order_id.partner_id or False)
                    for tax in line_taxes['taxes']:
                        taxes.setdefault(tax['id'], {'name': tax['name'], 'tax_amount':0.0, 'base_amount':0.0})
                        taxes[tax['id']]['tax_amount'] += tax['amount']
                        taxes[tax['id']]['base_amount'] += tax['base']
                else:
                    taxes.setdefault(0, {'name': _('No Taxes'), 'tax_amount':0.0, 'base_amount':0.0})
                    taxes[0]['base_amount'] += line.price_subtotal_incl

        payment_ids = self.env["pos.payment"].search([('pos_order_id', 'in', orders.ids)]).ids
        if payment_ids:
            self.env.cr.execute("""
                SELECT method.name, sum(amount) total
                FROM pos_payment AS payment,
                     pos_payment_method AS method
                WHERE payment.payment_method_id = method.id
                    AND payment.id IN %s
                GROUP BY method.name
            """, (tuple(payment_ids),))
            payments = self.env.cr.dictfetchall()
        else:
            payments = []

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

    @api.model
    def _get_report_values(self, docids, data=None):
        data = dict(data or {})
        configs = self.env['pos.config'].browse(data['config_ids'])
        data.update(self.get_sale_details(data['date_start'], data['date_stop'], configs.ids))
        return data

class AccountCashRounding(models.Model):
    _inherit = 'account.cash.rounding'

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