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

from odoo import api, fields, models, _
from odoo.tools.float_utils import float_compare

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):
        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]

    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,
        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")

    @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 in ['done', 'cancel'] for x in order.picking_ids]):
                order.is_shipped = True

    @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

    # --------------------------------------------------
    # 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
    # --------------------------------------------------

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

    @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))
            # 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:
                        move_dest_ids = order_line.move_dest_ids.filtered(lambda m: m.state not in ('done', 'cancel'))
                        siblings_states = (move_dest_ids.mapped('move_orig_ids')).mapped('state')
                        if all(state in ('done', 'cancel') for state in siblings_states):
                            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()

    @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_all')
        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 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)
            result['views'] = [(res and res.id or False, 'form')]
            result['res_id'] = pick_ids.id
        return result

    # --------------------------------------------------
    # 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)

    @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


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

    move_ids = fields.One2many('stock.move', 'purchase_line_id', string='Reservation', readonly=True, ondelete='set null', copy=False)
    orderpoint_id = fields.Many2one('stock.warehouse.orderpoint', 'Orderpoint')
    move_dest_ids = fields.One2many('stock.move', 'created_purchase_line_id', 'Downstream Moves')

    @api.model
    def create(self, values):
        line = super(PurchaseOrderLine, self).create(values)
        if line.order_id.state == 'purchase':
            line._create_or_update_picking()
        return line

    @api.multi
    def write(self, values):
        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

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

    @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 = {
            # 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,
            '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):
        values = []
        for line in self:
            for val in line._prepare_stock_moves(picking):
                values.append(val)
        return self.env['stock.move'].create(values)

    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)
                    elif 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
                    else:
                        total += move.product_uom._compute_quantity(move.product_uom_qty, line.product_uom)
            line.qty_received = total

    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
