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

from datetime import datetime
from dateutil.relativedelta import relativedelta

from odoo import api, fields, models, SUPERUSER_ID, _
from odoo.tools import DEFAULT_SERVER_DATETIME_FORMAT
from odoo.tools.float_utils import float_is_zero, float_compare
from odoo.exceptions import UserError, AccessError
from odoo.tools.misc import formatLang
from odoo.addons.base.models.res_partner import WARNING_MESSAGE, WARNING_HELP
from odoo.addons import decimal_precision as dp


class PurchaseOrder(models.Model):
    _name = "purchase.order"
    _inherit = ['mail.thread', 'mail.activity.mixin']
    _description = "Purchase Order"
    _order = 'date_order desc, id desc'

    @api.depends('order_line.price_total')
    def _amount_all(self):
        for order in self:
            amount_untaxed = amount_tax = 0.0
            for line in order.order_line:
                amount_untaxed += line.price_subtotal
                amount_tax += line.price_tax
            order.update({
                'amount_untaxed': order.currency_id.round(amount_untaxed),
                'amount_tax': order.currency_id.round(amount_tax),
                'amount_total': amount_untaxed + amount_tax,
            })

    @api.depends('order_line.date_planned')
    def _compute_date_planned(self):
        for order in self:
            min_date = False
            for line in order.order_line:
                if not min_date or line.date_planned < min_date:
                    min_date = line.date_planned
            if min_date:
                order.date_planned = min_date

    @api.depends('state', 'order_line.qty_invoiced', 'order_line.qty_received', 'order_line.product_qty')
    def _get_invoiced(self):
        precision = self.env['decimal.precision'].precision_get('Product Unit of Measure')
        for order in self:
            if order.state not in ('purchase', 'done'):
                order.invoice_status = 'no'
                continue

            if any(float_compare(line.qty_invoiced, line.product_qty if line.product_id.purchase_method == 'purchase' else line.qty_received, precision_digits=precision) == -1 for line in order.order_line):
                order.invoice_status = 'to invoice'
            elif all(float_compare(line.qty_invoiced, line.product_qty if line.product_id.purchase_method == 'purchase' else line.qty_received, precision_digits=precision) >= 0 for line in order.order_line) and order.invoice_ids:
                order.invoice_status = 'invoiced'
            else:
                order.invoice_status = 'no'

    @api.depends('order_line.invoice_lines.invoice_id')
    def _compute_invoice(self):
        for order in self:
            invoices = self.env['account.invoice']
            for line in order.order_line:
                invoices |= line.invoice_lines.mapped('invoice_id')
            order.invoice_ids = invoices
            order.invoice_count = len(invoices)

    @api.model
    def _default_picking_type(self):
        type_obj = self.env['stock.picking.type']
        company_id = self.env.context.get('company_id') or self.env.user.company_id.id
        types = type_obj.search([('code', '=', 'incoming'), ('warehouse_id.company_id', '=', company_id)])
        if not types:
            types = type_obj.search([('code', '=', 'incoming'), ('warehouse_id', '=', False)])
        return types[:1]

    @api.depends('order_line.move_ids.returned_move_ids',
                 'order_line.move_ids.state',
                 'order_line.move_ids.picking_id')
    def _compute_picking(self):
        for order in self:
            pickings = self.env['stock.picking']
            for line in order.order_line:
                # We keep a limited scope on purpose. Ideally, we should also use move_orig_ids and
                # do some recursive search, but that could be prohibitive if not done correctly.
                moves = line.move_ids | line.move_ids.mapped('returned_move_ids')
                pickings |= moves.mapped('picking_id')
            order.picking_ids = pickings
            order.picking_count = len(pickings)

    @api.depends('picking_ids', 'picking_ids.state')
    def _compute_is_shipped(self):
        for order in self:
            if order.picking_ids and all([x.state == 'done' for x in order.picking_ids]):
                order.is_shipped = True

    READONLY_STATES = {
        'purchase': [('readonly', True)],
        'done': [('readonly', True)],
        'cancel': [('readonly', True)],
    }

    name = fields.Char('Order Reference', required=True, index=True, copy=False, default='New')
    origin = fields.Char('Source Document', copy=False,\
        help="Reference of the document that generated this purchase order "
             "request (e.g. a sales order)")
    partner_ref = fields.Char('Vendor Reference', copy=False,\
        help="Reference of the sales order or bid sent by the vendor. "
             "It's used to do the matching when you receive the "
             "products as this reference is usually written on the "
             "delivery order sent by your vendor.")
    date_order = fields.Datetime('Order Date', required=True, states=READONLY_STATES, index=True, copy=False, default=fields.Datetime.now,\
        help="Depicts the date where the Quotation should be validated and converted into a purchase order.")
    date_approve = fields.Date('Approval Date', readonly=1, index=True, copy=False)
    partner_id = fields.Many2one('res.partner', string='Vendor', required=True, states=READONLY_STATES, change_default=True, track_visibility='always')
    dest_address_id = fields.Many2one('res.partner', string='Drop Ship Address', states=READONLY_STATES,\
        help="Put an address if you want to deliver directly from the vendor to the customer. "\
             "Otherwise, keep empty to deliver to your own company.")
    currency_id = fields.Many2one('res.currency', 'Currency', required=True, states=READONLY_STATES,\
        default=lambda self: self.env.user.company_id.currency_id.id)
    state = fields.Selection([
        ('draft', 'RFQ'),
        ('sent', 'RFQ Sent'),
        ('to approve', 'To Approve'),
        ('purchase', 'Purchase Order'),
        ('done', 'Locked'),
        ('cancel', 'Cancelled')
        ], string='Status', readonly=True, index=True, copy=False, default='draft', track_visibility='onchange')
    order_line = fields.One2many('purchase.order.line', 'order_id', string='Order Lines', states={'cancel': [('readonly', True)], 'done': [('readonly', True)]}, copy=True)
    notes = fields.Text('Terms and Conditions')

    invoice_count = fields.Integer(compute="_compute_invoice", string='Bill Count', copy=False, default=0, store=True)
    invoice_ids = fields.Many2many('account.invoice', compute="_compute_invoice", string='Bills', copy=False, store=True)
    invoice_status = fields.Selection([
        ('no', 'Nothing to Bill'),
        ('to invoice', 'Waiting Bills'),
        ('invoiced', 'No Bill to Receive'),
        ], string='Billing Status', compute='_get_invoiced', store=True, readonly=True, copy=False, default='no')

    picking_count = fields.Integer(compute='_compute_picking', string='Picking count', default=0, store=True)
    picking_ids = fields.Many2many('stock.picking', compute='_compute_picking', string='Receptions', copy=False, store=True)

    # There is no inverse function on purpose since the date may be different on each line
    date_planned = fields.Datetime(string='Scheduled Date', compute='_compute_date_planned', store=True, index=True)

    amount_untaxed = fields.Monetary(string='Untaxed Amount', store=True, readonly=True, compute='_amount_all', track_visibility='always')
    amount_tax = fields.Monetary(string='Taxes', store=True, readonly=True, compute='_amount_all')
    amount_total = fields.Monetary(string='Total', store=True, readonly=True, compute='_amount_all')

    fiscal_position_id = fields.Many2one('account.fiscal.position', string='Fiscal Position', oldname='fiscal_position')
    payment_term_id = fields.Many2one('account.payment.term', 'Payment Terms')
    incoterm_id = fields.Many2one('stock.incoterms', 'Incoterm', states={'done': [('readonly', True)]}, help="International Commercial Terms are a series of predefined commercial terms used in international transactions.")

    product_id = fields.Many2one('product.product', related='order_line.product_id', string='Product')
    user_id = fields.Many2one('res.users', string='Purchase Representative', index=True, track_visibility='onchange', default=lambda self: self.env.user)
    company_id = fields.Many2one('res.company', 'Company', required=True, index=True, states=READONLY_STATES, default=lambda self: self.env.user.company_id.id)

    picking_type_id = fields.Many2one('stock.picking.type', 'Deliver To', states=READONLY_STATES, required=True, default=_default_picking_type,\
        help="This will determine operation type of incoming shipment")
    default_location_dest_id_usage = fields.Selection(related='picking_type_id.default_location_dest_id.usage', string='Destination Location Type',\
        help="Technical field used to display the Drop Ship Address", readonly=True)
    group_id = fields.Many2one('procurement.group', string="Procurement Group", copy=False)
    is_shipped = fields.Boolean(compute="_compute_is_shipped")

    website_url = fields.Char(
        'Website URL', compute='_website_url',
        help='The full URL to access the document through the website.')

    def _website_url(self):
        for order in self:
            order.website_url = '/my/purchase/%s' % (order.id)

    @api.model
    def name_search(self, name, args=None, operator='ilike', limit=100):
        args = args or []
        domain = []
        if name:
            domain = ['|', ('name', operator, name), ('partner_ref', operator, name)]
        pos = self.search(domain + args, limit=limit)
        return pos.name_get()

    @api.multi
    @api.depends('name', 'partner_ref')
    def name_get(self):
        result = []
        for po in self:
            name = po.name
            if po.partner_ref:
                name += ' ('+po.partner_ref+')'
            if self.env.context.get('show_total_amount') and po.amount_total:
                name += ': ' + formatLang(self.env, po.amount_total, currency_obj=po.currency_id)
            result.append((po.id, name))
        return result

    @api.model
    def create(self, vals):
        if vals.get('name', 'New') == 'New':
            vals['name'] = self.env['ir.sequence'].next_by_code('purchase.order') or '/'
        return super(PurchaseOrder, self).create(vals)

    def write(self, vals):
        if vals.get('order_line') and self.state == 'purchase':
            for order in self:
                pre_order_line_qty = {order_line: order_line.product_qty for order_line in order.mapped('order_line')}
        res = super(PurchaseOrder, self).write(vals)
        if vals.get('order_line') and self.state == 'purchase':
            for order in self:
                to_log = {}
                for order_line in order.order_line:
                    if pre_order_line_qty.get(order_line, False) and float_compare(pre_order_line_qty[order_line], order_line.product_qty, precision_rounding=order_line.product_uom.rounding) > 0:
                        to_log[order_line] = (order_line.product_qty, pre_order_line_qty[order_line])
                if to_log:
                    order._log_decrease_ordered_quantity(to_log)
        return res

    @api.multi
    def unlink(self):
        for order in self:
            if not order.state == 'cancel':
                raise UserError(_('In order to delete a purchase order, you must cancel it first.'))
        return super(PurchaseOrder, self).unlink()

    @api.multi
    @api.returns('self', lambda value: value.id)
    def copy(self, default=None):
        new_po = super(PurchaseOrder, self).copy(default=default)
        for line in new_po.order_line:
            seller = line.product_id._select_seller(
                partner_id=line.partner_id, quantity=line.product_qty,
                date=line.order_id.date_order and line.order_id.date_order[:10], uom_id=line.product_uom)
            line.date_planned = line._get_date_planned(seller)
        return new_po

    @api.multi
    def _track_subtype(self, init_values):
        self.ensure_one()
        if 'state' in init_values and self.state == 'purchase':
            return 'purchase.mt_rfq_approved'
        elif 'state' in init_values and self.state == 'to approve':
            return 'purchase.mt_rfq_confirmed'
        elif 'state' in init_values and self.state == 'done':
            return 'purchase.mt_rfq_done'
        return super(PurchaseOrder, self)._track_subtype(init_values)

    @api.onchange('partner_id', 'company_id')
    def onchange_partner_id(self):
        if not self.partner_id:
            self.fiscal_position_id = False
            self.payment_term_id = False
            self.currency_id = False
        else:
            self.fiscal_position_id = self.env['account.fiscal.position'].with_context(company_id=self.company_id.id).get_fiscal_position(self.partner_id.id)
            self.payment_term_id = self.partner_id.property_supplier_payment_term_id.id
            if not self.currency_id:
                self.currency_id = self.partner_id.property_purchase_currency_id.id or self.env.user.company_id.currency_id.id
        return {}

    @api.onchange('fiscal_position_id')
    def _compute_tax_id(self):
        """
        Trigger the recompute of the taxes if the fiscal position is changed on the PO.
        """
        for order in self:
            order.order_line._compute_tax_id()

    @api.onchange('partner_id')
    def onchange_partner_id_warning(self):
        if not self.partner_id:
            return
        warning = {}
        title = False
        message = False

        partner = self.partner_id

        # If partner has no warning, check its company
        if partner.purchase_warn == 'no-message' and partner.parent_id:
            partner = partner.parent_id

        if partner.purchase_warn and partner.purchase_warn != 'no-message':
            # Block if partner only has warning but parent company is blocked
            if partner.purchase_warn != 'block' and partner.parent_id and partner.parent_id.purchase_warn == 'block':
                partner = partner.parent_id
            title = _("Warning for %s") % partner.name
            message = partner.purchase_warn_msg
            warning = {
                'title': title,
                'message': message
                }
            if partner.purchase_warn == 'block':
                self.update({'partner_id': False})
            return {'warning': warning}
        return {}

    @api.onchange('picking_type_id')
    def _onchange_picking_type_id(self):
        if self.picking_type_id.default_location_dest_id.usage != 'customer':
            self.dest_address_id = False

    @api.multi
    def action_rfq_send(self):
        '''
        This function opens a window to compose an email, with the edi purchase template message loaded by default
        '''
        self.ensure_one()
        ir_model_data = self.env['ir.model.data']
        try:
            if self.env.context.get('send_rfq', False):
                template_id = ir_model_data.get_object_reference('purchase', 'email_template_edi_purchase')[1]
            else:
                template_id = ir_model_data.get_object_reference('purchase', 'email_template_edi_purchase_done')[1]
        except ValueError:
            template_id = False
        try:
            compose_form_id = ir_model_data.get_object_reference('mail', 'email_compose_message_wizard_form')[1]
        except ValueError:
            compose_form_id = False
        ctx = dict(self.env.context or {})
        ctx.update({
            'default_model': 'purchase.order',
            'default_res_id': self.ids[0],
            'default_use_template': bool(template_id),
            'default_template_id': template_id,
            'default_composition_mode': 'comment',
            'custom_layout': "mail.mail_notification_borders",
            'force_email': True,
            'mark_rfq_as_sent': True,
        })
        return {
            'name': _('Compose Email'),
            'type': 'ir.actions.act_window',
            'view_type': 'form',
            'view_mode': 'form',
            'res_model': 'mail.compose.message',
            'views': [(compose_form_id, 'form')],
            'view_id': compose_form_id,
            'target': 'new',
            'context': ctx,
        }

    @api.multi
    @api.returns('self', lambda value: value.id)
    def message_post(self, **kwargs):
        if self.env.context.get('mark_rfq_as_sent'):
            self.filtered(lambda o: o.state == 'draft').write({'state': 'sent'})
        return super(PurchaseOrder, self.with_context(mail_post_autofollow=True)).message_post(**kwargs)

    @api.multi
    def print_quotation(self):
        return self.env.ref('purchase.report_purchase_quotation').report_action(self)

    @api.multi
    def button_approve(self, force=False):
        self.write({'state': 'purchase', 'date_approve': fields.Date.context_today(self)})
        self._create_picking()
        self.filtered(
            lambda p: p.company_id.po_lock == 'lock').write({'state': 'done'})
        return {}

    @api.multi
    def button_draft(self):
        self.write({'state': 'draft'})
        return {}

    @api.multi
    def button_confirm(self):
        for order in self:
            if order.state not in ['draft', 'sent']:
                continue
            order._add_supplier_to_product()
            # Deal with double validation process
            if order.company_id.po_double_validation == 'one_step'\
                    or (order.company_id.po_double_validation == 'two_step'\
                        and order.amount_total < self.env.user.company_id.currency_id._convert(
                            order.company_id.po_double_validation_amount, order.currency_id, order.company_id, order.date_order or fields.Date.today()))\
                    or order.user_has_groups('purchase.group_purchase_manager'):
                order.button_approve()
            else:
                order.write({'state': 'to approve'})
        return True

    @api.multi
    def button_cancel(self):
        for order in self:
            for pick in order.picking_ids:
                if pick.state == 'done':
                    raise UserError(_('Unable to cancel purchase order %s as some receptions have already been done.') % (order.name))
            for inv in order.invoice_ids:
                if inv and inv.state not in ('cancel', 'draft'):
                    raise UserError(_("Unable to cancel this purchase order. You must first cancel related vendor bills."))

            # If the product is MTO, change the procure_method of the the closest move to purchase to MTS.
            # The purpose is to link the po that the user will manually generate to the existing moves's chain.
            if order.state in ('draft', 'sent', 'to approve'):
                for order_line in order.order_line:
                    if order_line.move_dest_ids:
                        siblings_states = (order_line.move_dest_ids.mapped('move_orig_ids')).mapped('state')
                        if all(state in ('done', 'cancel') for state in siblings_states):
                            order_line.move_dest_ids.write({'procure_method': 'make_to_stock'})
                            order_line.move_dest_ids._recompute_state()

            for pick in order.picking_ids.filtered(lambda r: r.state != 'cancel'):
                pick.action_cancel()

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

    @api.multi
    def button_unlock(self):
        self.write({'state': 'purchase'})

    @api.multi
    def button_done(self):
        self.write({'state': 'done'})

    @api.multi
    def _get_destination_location(self):
        self.ensure_one()
        if self.dest_address_id:
            return self.dest_address_id.property_stock_customer.id
        return self.picking_type_id.default_location_dest_id.id

    @api.model
    def _prepare_picking(self):
        if not self.group_id:
            self.group_id = self.group_id.create({
                'name': self.name,
                'partner_id': self.partner_id.id
            })
        if not self.partner_id.property_stock_supplier.id:
            raise UserError(_("You must set a Vendor Location for this partner %s") % self.partner_id.name)
        return {
            'picking_type_id': self.picking_type_id.id,
            'partner_id': self.partner_id.id,
            'date': self.date_order,
            'origin': self.name,
            'location_dest_id': self._get_destination_location(),
            'location_id': self.partner_id.property_stock_supplier.id,
            'company_id': self.company_id.id,
        }

    @api.multi
    def _create_picking(self):
        StockPicking = self.env['stock.picking']
        for order in self:
            if any([ptype in ['product', 'consu'] for ptype in order.order_line.mapped('product_id.type')]):
                pickings = order.picking_ids.filtered(lambda x: x.state not in ('done','cancel'))
                if not pickings:
                    res = order._prepare_picking()
                    picking = StockPicking.create(res)
                else:
                    picking = pickings[0]
                moves = order.order_line._create_stock_moves(picking)
                moves = moves.filtered(lambda x: x.state not in ('done', 'cancel'))._action_confirm()
                seq = 0
                for move in sorted(moves, key=lambda move: move.date_expected):
                    seq += 5
                    move.sequence = seq
                moves._action_assign()
                picking.message_post_with_view('mail.message_origin_link',
                    values={'self': picking, 'origin': order},
                    subtype_id=self.env.ref('mail.mt_note').id)
        return True

    @api.multi
    def _add_supplier_to_product(self):
        # Add the partner in the supplier list of the product if the supplier is not registered for
        # this product. We limit to 10 the number of suppliers for a product to avoid the mess that
        # could be caused for some generic products ("Miscellaneous").
        for line in self.order_line:
            # Do not add a contact as a supplier
            partner = self.partner_id if not self.partner_id.parent_id else self.partner_id.parent_id
            if partner not in line.product_id.seller_ids.mapped('name') and len(line.product_id.seller_ids) <= 10:
                currency = partner.property_purchase_currency_id or self.env.user.company_id.currency_id
                supplierinfo = {
                    'name': partner.id,
                    'sequence': max(line.product_id.seller_ids.mapped('sequence')) + 1 if line.product_id.seller_ids else 1,
                    'product_uom': line.product_uom.id,
                    'min_qty': 0.0,
                    'price': self.currency_id._convert(line.price_unit, currency, line.company_id, line.date_order or fields.Date.today()),
                    'currency_id': currency.id,
                    'delay': 0,
                }
                vals = {
                    'seller_ids': [(0, 0, supplierinfo)],
                }
                try:
                    line.product_id.write(vals)
                except AccessError:  # no write access rights -> just ignore
                    break

    def _log_decrease_ordered_quantity(self, purchase_order_lines_quantities):

        def _keys_in_sorted(move):
            """ sort by picking and the responsible for the product the
            move.
            """
            return (move.picking_id.id, move.product_id.responsible_id.id)

        def _keys_in_groupby(move):
            """ group by picking and the responsible for the product the
            move.
            """
            return (move.picking_id, move.product_id.responsible_id)

        def _render_note_exception_quantity_po(order_exceptions):
            order_line_ids = self.env['purchase.order.line'].browse([order_line.id for order in order_exceptions.values() for order_line in order[0]])
            purchase_order_ids = order_line_ids.mapped('order_id')
            move_ids = self.env['stock.move'].concat(*rendering_context.keys())
            impacted_pickings = move_ids.mapped('picking_id')._get_impacted_pickings(move_ids) - move_ids.mapped('picking_id')
            values = {
                'purchase_order_ids': purchase_order_ids,
                'order_exceptions': order_exceptions.values(),
                'impacted_pickings': impacted_pickings,
            }
            return self.env.ref('purchase.exception_on_po').render(values=values)

        documents = self.env['stock.picking']._log_activity_get_documents(purchase_order_lines_quantities, 'move_ids', 'DOWN', _keys_in_sorted, _keys_in_groupby)
        filtered_documents = {}
        for (parent, responsible), rendering_context in documents.items():
            if parent._name == 'stock.picking':
                if parent.state == 'cancel':
                    continue
            filtered_documents[(parent, responsible)] = rendering_context
        self.env['stock.picking']._log_activity(_render_note_exception_quantity_po, filtered_documents)

    @api.multi
    def action_view_picking(self):
        '''
        This function returns an action that display existing picking orders of given purchase order ids.
        When only one found, show the picking immediately.
        '''
        action = self.env.ref('stock.action_picking_tree')
        result = action.read()[0]

        #override the context to get rid of the default filtering on operation type
        result['context'] = {}
        pick_ids = self.mapped('picking_ids')
        #choose the view_mode accordingly
        if len(pick_ids) > 1:
            result['domain'] = "[('id','in',%s)]" % (pick_ids.ids)
        elif len(pick_ids) == 1:
            res = self.env.ref('stock.view_picking_form', False)
            result['views'] = [(res and res.id or False, 'form')]
            result['res_id'] = pick_ids.id
        return result

    @api.multi
    def action_view_invoice(self):
        '''
        This function returns an action that display existing vendor bills of given purchase order ids.
        When only one found, show the vendor bill immediately.
        '''
        action = self.env.ref('account.action_invoice_tree2')
        result = action.read()[0]

        #override the context to get rid of the default filtering
        result['context'] = {'type': 'in_invoice',
            'default_purchase_id': self.id,
            'default_currency_id': self.currency_id.id,
            'default_company_id': self.company_id.id,
            'company_id': self.company_id.id
        }

        #choose the view_mode accordingly
        if len(self.invoice_ids) != 1:
            result['domain'] = "[('id', 'in', " + str(self.invoice_ids.ids) + ")]"
        elif len(self.invoice_ids) == 1:
            res = self.env.ref('account.invoice_supplier_form', False)
            result['views'] = [(res and res.id or False, 'form')]
            result['res_id'] = self.invoice_ids.id
        return result

    @api.multi
    def action_set_date_planned(self):
        for order in self:
            order.order_line.update({'date_planned': order.date_planned})


class PurchaseOrderLine(models.Model):
    _name = 'purchase.order.line'
    _description = 'Purchase Order Line'
    _order = 'order_id, sequence, id'

    @api.depends('product_qty', 'price_unit', 'taxes_id')
    def _compute_amount(self):
        for line in self:
            taxes = line.taxes_id.compute_all(line.price_unit, line.order_id.currency_id, line.product_qty, product=line.product_id, partner=line.order_id.partner_id)
            line.update({
                'price_tax': sum(t.get('amount', 0.0) for t in taxes.get('taxes', [])),
                'price_total': taxes['total_included'],
                'price_subtotal': taxes['total_excluded'],
            })

    @api.multi
    def _compute_tax_id(self):
        for line in self:
            fpos = line.order_id.fiscal_position_id or line.order_id.partner_id.property_account_position_id
            # If company_id is set, always filter taxes by the company
            taxes = line.product_id.supplier_taxes_id.filtered(lambda r: not line.company_id or r.company_id == line.company_id)
            line.taxes_id = fpos.map_tax(taxes, line.product_id, line.order_id.partner_id) if fpos else taxes

    @api.depends('invoice_lines.invoice_id.state', 'invoice_lines.quantity')
    def _compute_qty_invoiced(self):
        for line in self:
            qty = 0.0
            for inv_line in line.invoice_lines:
                if inv_line.invoice_id.state not in ['cancel']:
                    if inv_line.invoice_id.type == 'in_invoice':
                        qty += inv_line.uom_id._compute_quantity(inv_line.quantity, line.product_uom)
                    elif inv_line.invoice_id.type == 'in_refund':
                        qty -= inv_line.uom_id._compute_quantity(inv_line.quantity, line.product_uom)
            line.qty_invoiced = qty

    @api.model
    def create(self, values):
        line = super(PurchaseOrderLine, self).create(values)
        if line.order_id.state == 'purchase':
            line._create_or_update_picking()
            msg = _("Extra line with %s ") % (line.product_id.display_name,)
            line.order_id.message_post(body=msg)
        return line

    @api.multi
    def write(self, values):
        if 'product_qty' in values:
            for line in self:
                if line.order_id.state == 'purchase':
                    line.order_id.message_post_with_view('purchase.track_po_line_template',
                                                         values={'line': line, 'product_qty': values['product_qty']},
                                                         subtype_id=self.env.ref('mail.mt_note').id)
        result = super(PurchaseOrderLine, self).write(values)
        # Update expected date of corresponding moves
        if 'date_planned' in values:
            self.env['stock.move'].search([
                ('purchase_line_id', 'in', self.ids), ('state', '!=', 'done')
            ]).write({'date_expected': values['date_planned']})
        if 'product_qty' in values:
            self.filtered(lambda l: l.order_id.state == 'purchase')._create_or_update_picking()
        return result

    name = fields.Text(string='Description', required=True)
    sequence = fields.Integer(string='Sequence', default=10)
    product_qty = fields.Float(string='Quantity', digits=dp.get_precision('Product Unit of Measure'), required=True)
    date_planned = fields.Datetime(string='Scheduled Date', required=True, index=True)
    taxes_id = fields.Many2many('account.tax', string='Taxes', domain=['|', ('active', '=', False), ('active', '=', True)])
    product_uom = fields.Many2one('uom.uom', string='Product Unit of Measure', required=True)
    product_id = fields.Many2one('product.product', string='Product', domain=[('purchase_ok', '=', True)], change_default=True, required=True)
    product_image = fields.Binary(
        'Product Image', related="product_id.image",
        help="Non-stored related field to allow portal user to see the image of the product he has ordered")
    product_type = fields.Selection(related='product_id.type', readonly=True)
    move_ids = fields.One2many('stock.move', 'purchase_line_id', string='Reservation', readonly=True, ondelete='set null', copy=False)
    price_unit = fields.Float(string='Unit Price', required=True, digits=dp.get_precision('Product Price'))

    price_subtotal = fields.Monetary(compute='_compute_amount', string='Subtotal', store=True)
    price_total = fields.Monetary(compute='_compute_amount', string='Total', store=True)
    price_tax = fields.Float(compute='_compute_amount', string='Tax', store=True)

    order_id = fields.Many2one('purchase.order', string='Order Reference', index=True, required=True, ondelete='cascade')
    account_analytic_id = fields.Many2one('account.analytic.account', string='Analytic Account')
    analytic_tag_ids = fields.Many2many('account.analytic.tag', string='Analytic Tags')
    company_id = fields.Many2one('res.company', related='order_id.company_id', string='Company', store=True, readonly=True)
    state = fields.Selection(related='order_id.state', store=True)

    invoice_lines = fields.One2many('account.invoice.line', 'purchase_line_id', string="Bill Lines", readonly=True, copy=False)

    # Replace by invoiced Qty
    qty_invoiced = fields.Float(compute='_compute_qty_invoiced', string="Billed Qty", digits=dp.get_precision('Product Unit of Measure'), store=True)
    qty_received = fields.Float(string="Received Qty", digits=dp.get_precision('Product Unit of Measure'))

    partner_id = fields.Many2one('res.partner', related='order_id.partner_id', string='Partner', readonly=True, store=True)
    currency_id = fields.Many2one(related='order_id.currency_id', store=True, string='Currency', readonly=True)
    date_order = fields.Datetime(related='order_id.date_order', string='Order Date', readonly=True)

    orderpoint_id = fields.Many2one('stock.warehouse.orderpoint', 'Orderpoint')
    move_dest_ids = fields.One2many('stock.move', 'created_purchase_line_id', 'Downstream Moves')

    def _update_received_qty(self):
        for line in self:
            total = 0.0
            for move in line.move_ids:
                if move.state == 'done':
                    if move.location_dest_id.usage == "supplier":
                        if move.to_refund:
                            total -= move.product_uom._compute_quantity(move.product_uom_qty, line.product_uom)
                    else:
                        total += move.product_uom._compute_quantity(move.product_uom_qty, line.product_uom)
            line.qty_received = total

    @api.multi
    def _create_or_update_picking(self):
        for line in self:
            if line.product_id.type in ('product', 'consu'):
                # Prevent decreasing below received quantity
                if float_compare(line.product_qty, line.qty_received, line.product_uom.rounding) < 0:
                    raise UserError(_('You cannot decrease the ordered quantity below the received quantity.\n'
                                      'Create a return first.'))

                if float_compare(line.product_qty, line.qty_invoiced, line.product_uom.rounding) == -1:
                    # If the quantity is now below the invoiced quantity, create an activity on the vendor bill
                    # inviting the user to create a refund.
                    activity = self.env['mail.activity'].sudo().create({
                        'activity_type_id': self.env.ref('mail.mail_activity_data_todo').id,
                        'note': _('The quantities on your purchase order indicate less than billed. You should ask for a refund. '),
                        'res_id': line.invoice_lines[0].invoice_id.id,
                        'res_model_id': self.env.ref('account.model_account_invoice').id,
                    })
                    activity._onchange_activity_type_id()

                # If the user increased quantity of existing line or created a new line
                pickings = line.order_id.picking_ids.filtered(lambda x: x.state not in ('done', 'cancel') and x.location_dest_id.usage in ('internal', 'transit'))
                picking = pickings and pickings[0] or False
                if not picking:
                    res = line.order_id._prepare_picking()
                    picking = self.env['stock.picking'].create(res)
                move_vals = line._prepare_stock_moves(picking)
                for move_val in move_vals:
                    self.env['stock.move']\
                        .create(move_val)\
                        ._action_confirm()\
                        ._action_assign()

    @api.multi
    def _get_stock_move_price_unit(self):
        self.ensure_one()
        line = self[0]
        order = line.order_id
        price_unit = line.price_unit
        if line.taxes_id:
            price_unit = line.taxes_id.with_context(round=False).compute_all(
                price_unit, currency=line.order_id.currency_id, quantity=1.0, product=line.product_id, partner=line.order_id.partner_id
            )['total_excluded']
        if line.product_uom.id != line.product_id.uom_id.id:
            price_unit *= line.product_uom.factor / line.product_id.uom_id.factor
        if order.currency_id != order.company_id.currency_id:
            price_unit = order.currency_id._convert(
                price_unit, order.company_id.currency_id, self.company_id, self.date_order or fields.Date.today(), round=False)
        return price_unit

    @api.multi
    def _prepare_stock_moves(self, picking):
        """ Prepare the stock moves data for one order line. This function returns a list of
        dictionary ready to be used in stock.move's create()
        """
        self.ensure_one()
        res = []
        if self.product_id.type not in ['product', 'consu']:
            return res
        qty = 0.0
        price_unit = self._get_stock_move_price_unit()
        for move in self.move_ids.filtered(lambda x: x.state != 'cancel' and not x.location_dest_id.usage == "supplier"):
            qty += move.product_uom._compute_quantity(move.product_uom_qty, self.product_uom, rounding_method='HALF-UP')
        template = {
            'name': self.name or '',
            'product_id': self.product_id.id,
            'product_uom': self.product_uom.id,
            'date': self.order_id.date_order,
            'date_expected': self.date_planned,
            'location_id': self.order_id.partner_id.property_stock_supplier.id,
            'location_dest_id': self.order_id._get_destination_location(),
            'picking_id': picking.id,
            'partner_id': self.order_id.dest_address_id.id,
            'move_dest_ids': [(4, x) for x in self.move_dest_ids.ids],
            'state': 'draft',
            'purchase_line_id': self.id,
            'company_id': self.order_id.company_id.id,
            'price_unit': price_unit,
            'picking_type_id': self.order_id.picking_type_id.id,
            'group_id': self.order_id.group_id.id,
            'origin': self.order_id.name,
            'route_ids': self.order_id.picking_type_id.warehouse_id and [(6, 0, [x.id for x in self.order_id.picking_type_id.warehouse_id.route_ids])] or [],
            'warehouse_id': self.order_id.picking_type_id.warehouse_id.id,
        }
        diff_quantity = self.product_qty - qty
        if float_compare(diff_quantity, 0.0,  precision_rounding=self.product_uom.rounding) > 0:
            quant_uom = self.product_id.uom_id
            get_param = self.env['ir.config_parameter'].sudo().get_param
            if self.product_uom.id != quant_uom.id and get_param('stock.propagate_uom') != '1':
                product_qty = self.product_uom._compute_quantity(diff_quantity, quant_uom, rounding_method='HALF-UP')
                template['product_uom'] = quant_uom.id
                template['product_uom_qty'] = product_qty
            else:
                template['product_uom_qty'] = diff_quantity
            res.append(template)
        return res

    @api.multi
    def _create_stock_moves(self, picking):
        moves = self.env['stock.move']
        done = self.env['stock.move'].browse()
        for line in self:
            for val in line._prepare_stock_moves(picking):
                done += moves.create(val)
        return done

    @api.multi
    def unlink(self):
        for line in self:
            if line.order_id.state in ['purchase', 'done']:
                raise UserError(_('Cannot delete a purchase order line which is in state \'%s\'.') %(line.state,))
        return super(PurchaseOrderLine, self).unlink()

    @api.model
    def _get_date_planned(self, seller, po=False):
        """Return the datetime value to use as Schedule Date (``date_planned``) for
           PO Lines that correspond to the given product.seller_ids,
           when ordered at `date_order_str`.

           :param Model seller: used to fetch the delivery delay (if no seller
                                is provided, the delay is 0)
           :param Model po: purchase.order, necessary only if the PO line is
                            not yet attached to a PO.
           :rtype: datetime
           :return: desired Schedule Date for the PO line
        """
        date_order = po.date_order if po else self.order_id.date_order
        if date_order:
            return datetime.strptime(date_order, DEFAULT_SERVER_DATETIME_FORMAT) + relativedelta(days=seller.delay if seller else 0)
        else:
            return datetime.today() + relativedelta(days=seller.delay if seller else 0)

    def _merge_in_existing_line(self, product_id, product_qty, product_uom, location_id, name, origin, values):
        """ This function purpose is to be override with the purpose to forbide _run_buy  method
        to merge a new po line in an existing one.
        """
        return True

    @api.onchange('product_id')
    def onchange_product_id(self):
        result = {}
        if not self.product_id:
            return result

        # Reset date, price and quantity since _onchange_quantity will provide default values
        self.date_planned = datetime.today().strftime(DEFAULT_SERVER_DATETIME_FORMAT)
        self.price_unit = self.product_qty = 0.0
        self.product_uom = self.product_id.uom_po_id or self.product_id.uom_id
        result['domain'] = {'product_uom': [('category_id', '=', self.product_id.uom_id.category_id.id)]}

        product_lang = self.product_id.with_context(
            lang=self.partner_id.lang,
            partner_id=self.partner_id.id,
        )
        self.name = product_lang.display_name
        if product_lang.description_purchase:
            self.name += '\n' + product_lang.description_purchase

        fpos = self.order_id.fiscal_position_id
        if self.env.uid == SUPERUSER_ID:
            company_id = self.env.user.company_id.id
            self.taxes_id = fpos.map_tax(self.product_id.supplier_taxes_id.filtered(lambda r: r.company_id.id == company_id))
        else:
            self.taxes_id = fpos.map_tax(self.product_id.supplier_taxes_id)

        self._suggest_quantity()
        self._onchange_quantity()

        return result

    @api.onchange('product_id')
    def onchange_product_id_warning(self):
        if not self.product_id:
            return
        warning = {}
        title = False
        message = False

        product_info = self.product_id

        if product_info.purchase_line_warn != 'no-message':
            title = _("Warning for %s") % product_info.name
            message = product_info.purchase_line_warn_msg
            warning['title'] = title
            warning['message'] = message
            if product_info.purchase_line_warn == 'block':
                self.product_id = False
            return {'warning': warning}
        return {}

    @api.onchange('product_qty', 'product_uom')
    def _onchange_quantity(self):
        if not self.product_id:
            return
        params = {'order_id': self.order_id}
        seller = self.product_id._select_seller(
            partner_id=self.partner_id,
            quantity=self.product_qty,
            date=self.order_id.date_order and self.order_id.date_order[:10],
            uom_id=self.product_uom,
            params=params)

        if seller or not self.date_planned:
            self.date_planned = self._get_date_planned(seller).strftime(DEFAULT_SERVER_DATETIME_FORMAT)

        if not seller:
            return

        price_unit = self.env['account.tax']._fix_tax_included_price_company(seller.price, self.product_id.supplier_taxes_id, self.taxes_id, self.company_id) if seller else 0.0
        if price_unit and seller and self.order_id.currency_id and seller.currency_id != self.order_id.currency_id:
            price_unit = seller.currency_id._convert(
                price_unit, self.order_id.currency_id, self.order_id.company_id, self.date_order or fields.Date.today())

        if seller and self.product_uom and seller.product_uom != self.product_uom:
            price_unit = seller.product_uom._compute_price(price_unit, self.product_uom)

        self.price_unit = price_unit

    def _suggest_quantity(self):
        '''
        Suggest a minimal quantity based on the seller
        '''
        if not self.product_id:
            return

        seller_min_qty = self.product_id.seller_ids\
            .filtered(lambda r: r.name == self.order_id.partner_id)\
            .sorted(key=lambda r: r.min_qty)
        if seller_min_qty:
            self.product_qty = seller_min_qty[0].min_qty or 1.0
            self.product_uom = seller_min_qty[0].product_uom
        else:
            self.product_qty = 1.0
