# -*- coding: utf-8 -*-
# Part of Odoo. See LICENSE file for full copyright and licensing details.
from odoo import api, fields, models, SUPERUSER_ID, _
from odoo.tools.float_utils import float_compare
from datetime import datetime
from dateutil.relativedelta import relativedelta
from odoo.exceptions import UserError

from odoo.addons.purchase.models.purchase import PurchaseOrder as Purchase


class PurchaseOrder(models.Model):
    _inherit = 'purchase.order'

    @api.model
    def _default_picking_type(self):
        return self._get_picking_type(self.env.context.get('company_id') or self.env.company.id)

    incoterm_id = fields.Many2one('account.incoterms', 'Incoterm', states={'done': [('readonly', True)]}, help="International Commercial Terms are a series of predefined commercial terms used in international transactions.")

    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)

    picking_type_id = fields.Many2one('stock.picking.type', 'Deliver To', states=Purchase.READONLY_STATES, required=True, default=_default_picking_type, domain="['|', ('warehouse_id', '=', False), ('warehouse_id.company_id', '=', company_id)]",
        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")
    effective_date = fields.Datetime("Effective Date", compute='_compute_effective_date', store=True, copy=False,
        help="Completion date of the first receipt order.")
    on_time_rate = fields.Float(related='partner_id.on_time_rate')

    @api.depends('order_line.move_ids.picking_id')
    def _compute_picking(self):
        for order in self:
            pickings = order.order_line.move_ids.picking_id
            order.picking_ids = pickings
            order.picking_count = len(pickings)

    @api.depends('picking_ids.date_done')
    def _compute_effective_date(self):
        for order in self:
            pickings = order.picking_ids.filtered(lambda x: x.state == 'done' and x.location_dest_id.usage == 'internal' and x.date_done)
            order.effective_date = min(pickings.mapped('date_done'), default=False)

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

    @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.onchange('company_id')
    def _onchange_company_id(self):
        p_type = self.picking_type_id
        if not(p_type and p_type.code == 'incoming' and (p_type.warehouse_id.company_id == self.company_id or not p_type.warehouse_id)):
            self.picking_type_id = self._get_picking_type(self.company_id.id)

    # --------------------------------------------------
    # CRUD
    # --------------------------------------------------

    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

    # --------------------------------------------------
    # Actions
    # --------------------------------------------------

    def button_approve(self, force=False):
        result = super(PurchaseOrder, self).button_approve(force=force)
        self._create_picking()
        return result

    def button_cancel(self):
        for order in self:
            for move in order.order_line.mapped('move_ids'):
                if move.state == 'done':
                    raise UserError(_('Unable to cancel purchase order %s as some receptions have already been done.') % (order.name))
            # If the product is MTO, change the procure_method of 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', 'purchase'):
                for order_line in order.order_line:
                    order_line.move_ids._action_cancel()
                    if order_line.move_dest_ids:
                        move_dest_ids = order_line.move_dest_ids
                        if order_line.propagate_cancel:
                            move_dest_ids._action_cancel()
                        else:
                            move_dest_ids.write({'procure_method': 'make_to_stock'})
                            move_dest_ids._recompute_state()

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

            order.order_line.write({'move_dest_ids':[(5,0,0)]})

        return super(PurchaseOrder, self).button_cancel()

    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.
        """
        result = self.env["ir.actions.actions"]._for_xml_id('stock.action_picking_tree_all')
        # override the context to get rid of the default filtering on operation type
        result['context'] = {'default_partner_id': self.partner_id.id, 'default_origin': self.name, 'default_picking_type_id': self.picking_type_id.id}
        pick_ids = self.mapped('picking_ids')
        # choose the view_mode accordingly
        if not pick_ids or 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)
            form_view = [(res and res.id or False, 'form')]
            if 'views' in result:
                result['views'] = form_view + [(state,view) for state,view in result['views'] if view != 'form']
            else:
                result['views'] = form_view
            result['res_id'] = pick_ids.id
        return result

    def _prepare_invoice(self):
        invoice_vals = super()._prepare_invoice()
        invoice_vals['invoice_incoterm_id'] = self.incoterm_id.id
        return invoice_vals

    # --------------------------------------------------
    # Business methods
    # --------------------------------------------------

    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_stock.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)

    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 _get_picking_type(self, company_id):
        picking_type = self.env['stock.picking.type'].search([('code', '=', 'incoming'), ('warehouse_id.company_id', '=', company_id)])
        if not picking_type:
            picking_type = self.env['stock.picking.type'].search([('code', '=', 'incoming'), ('warehouse_id', '=', False)])
        return picking_type[:1]

    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,
            'user_id': False,
            '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,
        }

    def _create_picking(self):
        StockPicking = self.env['stock.picking']
        for order in self:
            if any(product.type in ['product', 'consu'] for product in order.order_line.product_id):
                order = order.with_company(order.company_id)
                pickings = order.picking_ids.filtered(lambda x: x.state not in ('done', 'cancel'))
                if not pickings:
                    res = order._prepare_picking()
                    picking = StockPicking.with_user(SUPERUSER_ID).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):
                    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

    def _add_picking_info(self, activity):
        """Helper method to add picking info to the Date Updated activity when
        vender updates date_planned of the po lines.
        """
        validated_picking = self.picking_ids.filtered(lambda p: p.state == 'done')
        if validated_picking:
            activity.note += _("<p>Those dates couldn’t be modified accordingly on the receipt %s which had already been validated.</p>") % validated_picking[0].name
        elif not self.picking_ids:
            activity.note += _("<p>Corresponding receipt not found.</p>")
        else:
            activity.note += _("<p>Those dates have been updated accordingly on the receipt %s.</p>") % self.picking_ids[0].name

    def _create_update_date_activity(self, updated_dates):
        activity = super()._create_update_date_activity(updated_dates)
        self._add_picking_info(activity)

    def _update_update_date_activity(self, updated_dates, activity):
        # remove old picking info to update it
        note_lines = activity.note.split('<p>')
        note_lines.pop()
        activity.note = '<p>'.join(note_lines)
        super()._update_update_date_activity(updated_dates, activity)
        self._add_picking_info(activity)

    @api.model
    def _get_orders_to_remind(self):
        """When auto sending reminder mails, don't send for purchase order with
        validated receipts."""
        return super()._get_orders_to_remind().filtered(lambda p: not p.effective_date)


class PurchaseOrderLine(models.Model):
    _inherit = 'purchase.order.line'

    qty_received_method = fields.Selection(selection_add=[('stock_moves', 'Stock Moves')])

    move_ids = fields.One2many('stock.move', 'purchase_line_id', string='Reservation', readonly=True, copy=False)
    orderpoint_id = fields.Many2one('stock.warehouse.orderpoint', 'Orderpoint')
    move_dest_ids = fields.One2many('stock.move', 'created_purchase_line_id', 'Downstream Moves')
    product_description_variants = fields.Char('Custom Description')
    propagate_cancel = fields.Boolean('Propagate cancellation', default=True)

    def _compute_qty_received_method(self):
        super(PurchaseOrderLine, self)._compute_qty_received_method()
        for line in self.filtered(lambda l: not l.display_type):
            if line.product_id.type in ['consu', 'product']:
                line.qty_received_method = 'stock_moves'

    @api.depends('move_ids.state', 'move_ids.product_uom_qty', 'move_ids.product_uom')
    def _compute_qty_received(self):
        super(PurchaseOrderLine, self)._compute_qty_received()
        for line in self:
            if line.qty_received_method == 'stock_moves':
                total = 0.0
                # In case of a BOM in kit, the products delivered do not correspond to the products in
                # the PO. Therefore, we can skip them since they will be handled later on.
                for move in line.move_ids.filtered(lambda m: m.product_id == line.product_id):
                    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)
                        elif move.origin_returned_move_id and move.origin_returned_move_id._is_dropshipped() and not move._is_dropshipped_returned():
                            # Edge case: the dropship is returned to the stock, no to the supplier.
                            # In this case, the received quantity on the PO is set although we didn't
                            # receive the product physically in our stock. To avoid counting the
                            # quantity twice, we do nothing.
                            pass
                        elif (
                            move.location_dest_id.usage == "internal"
                            and move.to_refund
                            and move.location_dest_id
                            not in self.env["stock.location"].search(
                                [("id", "child_of", move.warehouse_id.view_location_id.id)]
                            )
                        ):
                            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._track_qty_received(total)
                line.qty_received = total

    @api.model_create_multi
    def create(self, vals_list):
        lines = super(PurchaseOrderLine, self).create(vals_list)
        lines.filtered(lambda l: l.order_id.state == 'purchase')._create_or_update_picking()
        return lines

    def write(self, values):
        for line in self.filtered(lambda l: not l.display_type):
            # PO date_planned overrides any PO line date_planned values
            if values.get('date_planned'):
                new_date = fields.Datetime.to_datetime(values['date_planned'])
                self._update_move_date_deadline(new_date)
        result = super(PurchaseOrderLine, self).write(values)
        if 'product_qty' in values:
            self.filtered(lambda l: l.order_id.state == 'purchase')._create_or_update_picking()
        return result

    # --------------------------------------------------
    # Business methods
    # --------------------------------------------------

    def _update_move_date_deadline(self, new_date):
        """ Updates corresponding move picking line deadline dates that are not yet completed. """
        moves_to_update = self.move_ids.filtered(lambda m: m.state not in ('done', 'cancel'))
        if not moves_to_update:
            moves_to_update = self.move_dest_ids.filtered(lambda m: m.state not in ('done', 'cancel'))
        for move in moves_to_update:
            move.date_deadline = new_date + relativedelta(days=move.company_id.po_lead)

    def _create_or_update_picking(self):
        for line in self:
            if line.product_id and 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.
                    line.invoice_lines[0].move_id.activity_schedule(
                        'mail.mail_activity_data_warning',
                        note=_('The quantities on your purchase order indicate less than billed. You should ask for a refund.'))

                # 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', 'customer'))
                picking = pickings and pickings[0] or False
                if not picking:
                    res = line.order_id._prepare_picking()
                    picking = self.env['stock.picking'].create(res)

                moves = line._create_stock_moves(picking)
                moves._action_confirm()._action_assign()

    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_void']
        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

    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()
        outgoing_moves, incoming_moves = self._get_outgoing_incoming_moves()
        for move in outgoing_moves:
            qty -= move.product_uom._compute_quantity(move.product_uom_qty, self.product_uom, rounding_method='HALF-UP')
        for move in incoming_moves:
            qty += move.product_uom._compute_quantity(move.product_uom_qty, self.product_uom, rounding_method='HALF-UP')

        move_dests = self.move_dest_ids
        if not move_dests:
            move_dests = self.move_ids.move_dest_ids.filtered(lambda m: m.state != 'cancel' and not m.location_dest_id.usage == 'supplier')

        if not move_dests:
            qty_to_attach = 0
            qty_to_push = self.product_qty - qty
        else:
            move_dests_initial_demand = self.product_id.uom_id._compute_quantity(
                sum(move_dests.filtered(lambda m: m.state != 'cancel' and not m.location_dest_id.usage == 'supplier').mapped('product_qty')),
                self.product_uom, rounding_method='HALF-UP')
            qty_to_attach = move_dests_initial_demand - qty
            qty_to_push = self.product_qty - move_dests_initial_demand

        if float_compare(qty_to_attach, 0.0, precision_rounding=self.product_uom.rounding) > 0:
            product_uom_qty, product_uom = self.product_uom._adjust_uom_quantities(qty_to_attach, self.product_id.uom_id)
            res.append(self._prepare_stock_move_vals(picking, price_unit, product_uom_qty, product_uom))
        if float_compare(qty_to_push, 0.0, precision_rounding=self.product_uom.rounding) > 0:
            product_uom_qty, product_uom = self.product_uom._adjust_uom_quantities(qty_to_push, self.product_id.uom_id)
            extra_move_vals = self._prepare_stock_move_vals(picking, price_unit, product_uom_qty, product_uom)
            extra_move_vals['move_dest_ids'] = False  # don't attach
            res.append(extra_move_vals)
        return res

    def _prepare_stock_move_vals(self, picking, price_unit, product_uom_qty, product_uom):
        self.ensure_one()
        product = self.product_id.with_context(lang=self.order_id.dest_address_id.lang or self.env.user.lang)
        description_picking = product._get_description(self.order_id.picking_type_id)
        if self.product_description_variants:
            description_picking += self.product_description_variants
        date_planned = self.date_planned or self.order_id.date_planned
        return {
            # truncate to 2000 to avoid triggering index limit error
            # TODO: remove index in master?
            'name': (self.name or '')[:2000],
            'product_id': self.product_id.id,
            'date': date_planned,
            'date_deadline': date_planned + relativedelta(days=self.order_id.company_id.po_lead),
            'location_id': self.order_id.partner_id.property_stock_supplier.id,
            'location_dest_id': (self.orderpoint_id and not (self.move_ids | self.move_dest_ids)) and self.orderpoint_id.location_id.id or 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,
            'description_picking': description_picking,
            'propagate_cancel': self.propagate_cancel,
            '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,
            'product_uom_qty': product_uom_qty,
            'product_uom': product_uom.id,
        }

    @api.model
    def _prepare_purchase_order_line_from_procurement(self, product_id, product_qty, product_uom, company_id, values, po):
        line_description = product_id._get_description(po.picking_type_id)
        if values.get('product_description_variants'):
            line_description += values['product_description_variants']
        supplier = values.get('supplier')
        res = self._prepare_purchase_order_line(product_id, product_qty, product_uom, company_id, supplier, po)
        # We need to keep the vendor name set in _prepare_purchase_order_line. To avoid redundancy
        # in the line name, we add the line_description only if different from the product name.
        # This way, we shoud not lose any valuable information.
        if product_id.name != line_description:
            res['name'] += '\n' + line_description
        res['move_dest_ids'] = [(4, x.id) for x in values.get('move_dest_ids', [])]
        res['orderpoint_id'] = values.get('orderpoint_id', False) and values.get('orderpoint_id').id
        res['propagate_cancel'] = values.get('propagate_cancel')
        res['product_description_variants'] = values.get('product_description_variants')
        return res

    def _create_stock_moves(self, picking):
        values = []
        for line in self.filtered(lambda l: not l.display_type):
            for val in line._prepare_stock_moves(picking):
                values.append(val)
            line.move_dest_ids.created_purchase_line_id = False

        return self.env['stock.move'].create(values)

    def _find_candidate(self, product_id, product_qty, product_uom, location_id, name, origin, company_id, values):
        """ Return the record in self where the procument with values passed as
        args can be merged. If it returns an empty record then a new line will
        be created.
        """
        description_picking = product_id._get_description(self.order_id.picking_type_id) or ''
        if values.get('product_description_variants'):
            description_picking += values['product_description_variants']
        lines = self.filtered(
            lambda l: l.propagate_cancel == values['propagate_cancel']
            and ((values['orderpoint_id'] and not values['move_dest_ids']) and l.orderpoint_id == values['orderpoint_id'] or True)
        )

        # In case 'product_description_variants' is in the values, we also filter on the PO line
        # name. This way, we can merge lines with the same description. To do so, we need the
        # product name in the context of the PO partner.
        if lines and values.get('product_description_variants'):
            partner = self.mapped('order_id.partner_id')[:1]
            product_lang = product_id.with_context(
                lang=partner.lang,
                partner_id=partner.id,
            )
            name = product_lang.display_name
            if product_lang.description_purchase:
                name += '\n' + product_lang.description_purchase
            lines = lines.filtered(lambda l: l.name == name + '\n' + description_picking)
            if lines:
                return lines[0]

        return lines and lines[0] or self.env['purchase.order.line']

    def _get_outgoing_incoming_moves(self):
        outgoing_moves = self.env['stock.move']
        incoming_moves = self.env['stock.move']

        for move in self.move_ids.filtered(lambda r: r.state != 'cancel' and not r.scrapped and self.product_id == r.product_id):
            if move.location_dest_id.usage == "supplier" and move.to_refund:
                outgoing_moves |= move
            elif move.location_dest_id.usage != "supplier":
                if not move.origin_returned_move_id or (move.origin_returned_move_id and move.to_refund):
                    incoming_moves |= move

        return outgoing_moves, incoming_moves

    def _update_date_planned(self, updated_date):
        move_to_update = self.move_ids.filtered(lambda m: m.state not in ['done', 'cancel'])
        if move_to_update:
            super()._update_date_planned(updated_date)
            self._update_move_date_deadline(updated_date)

    @api.model
    def _update_qty_received_method(self):
        """Update qty_received_method for old PO before install this module."""
        self.search([])._compute_qty_received_method()
