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

from collections import defaultdict

from odoo import api, fields, models, _
from odoo.tools import OrderedSet


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

    mrp_production_count = fields.Integer(
        "Count of MO Source",
        compute='_compute_mrp_production_count',
        groups='mrp.group_mrp_user')

    @api.depends('reference_ids', 'reference_ids.production_ids')
    def _compute_mrp_production_count(self):
        for purchase in self:
            purchase.mrp_production_count = len(purchase._get_mrp_productions())

    def _get_mrp_productions(self, **kwargs):
        return self.reference_ids.production_ids

    def action_view_mrp_productions(self):
        self.ensure_one()
        mrp_production_ids = self._get_mrp_productions().ids
        action = {
            'res_model': 'mrp.production',
            'type': 'ir.actions.act_window',
        }
        if len(mrp_production_ids) == 1:
            action.update({
                'view_mode': 'form',
                'res_id': mrp_production_ids[0],
            })
        else:
            action.update({
                'name': _("Manufacturing Source of %s", self.name),
                'domain': [('id', 'in', mrp_production_ids)],
                'view_mode': 'list,form',
            })
        return action


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

    def _compute_kit_quantities_from_moves(self, moves, kit_bom):
        self.ensure_one()
        moves_to_consider = moves.filtered(lambda m: m.state == 'done' and m.location_dest_usage != 'inventory')
        order_qty = self.product_uom_id._compute_quantity(self.product_uom_qty, kit_bom.product_uom_id)
        filters = {
            'incoming_moves': lambda m:
                m._is_incoming() and
                (not m.origin_returned_move_id or (m.origin_returned_move_id and m.to_refund)),
            'outgoing_moves': lambda m:
                m._is_outgoing() and m.to_refund,
        }
        return moves_to_consider._compute_kit_quantities(self.product_id, order_qty, kit_bom, filters)

    def _prepare_qty_received(self):
        kit_invoiced_qties = defaultdict(float)
        kit_lines = self.env['purchase.order.line']
        lines_stock = self.filtered(lambda l: l.qty_received_method == 'stock_moves' and l.move_ids and l.state != 'cancel')
        product_by_company = defaultdict(OrderedSet)
        for line in lines_stock:
            product_by_company[line.company_id].add(line.product_id.id)
        kits_by_company = {
            company: self.env['mrp.bom']._bom_find(self.env['product.product'].browse(product_ids), company_id=company.id, bom_type='phantom')
            for company, product_ids in product_by_company.items()
        }
        for line in lines_stock:
            kit_bom = kits_by_company[line.company_id].get(line.product_id)
            if kit_bom:
                kit_invoiced_qties[line] = line._compute_kit_quantities_from_moves(line.move_ids, kit_bom)
                kit_lines += line
        invoiced_qties = super(PurchaseOrderLine, self - kit_lines)._prepare_qty_received()
        invoiced_qties.update(kit_invoiced_qties)
        return invoiced_qties

    def _prepare_stock_moves(self, picking):
        res = super()._prepare_stock_moves(picking)
        if len(self.order_id.reference_ids.move_ids.production_group_id) == 1:
            for re in res:
                re['production_group_id'] = self.order_id.reference_ids.move_ids.production_group_id.id
        sale_line_product = self._get_sale_order_line_product()
        if sale_line_product:
            bom = self.env['mrp.bom']._bom_find(self.env['product.product'].browse(sale_line_product.id), company_id=picking.company_id.id, bom_type='phantom')
            # Was a kit sold?
            bom_kit = bom.get(sale_line_product)
            if bom_kit:
                _dummy, bom_sub_lines = bom_kit.explode(sale_line_product, self.sale_line_id.product_uom_qty)
                bom_kit_component = {line['product_id'].id: line.id for line, _ in bom_sub_lines}
                # Find the sml for the kit component
                for vals in res:
                    if vals['product_id'] in bom_kit_component:
                        vals['bom_line_id'] = bom_kit_component[vals['product_id']]
        return res

    def _get_upstream_documents_and_responsibles(self, visited):
        return [(self.order_id, self.order_id.user_id, visited)]

    def _get_qty_procurement(self):
        self.ensure_one()
        # Specific case when we change the qty on a PO for a kit product.
        # We don't try to be too smart and keep a simple approach: we compare the quantity before
        # and after update, and return the difference. We don't take into account what was already
        # sent, or any other exceptional case.
        bom = self.env['mrp.bom'].sudo()._bom_find(self.product_id, bom_type='phantom')[self.product_id]
        if bom and 'previous_product_qty' in self.env.context:
            return self.env.context['previous_product_qty'].get(self.id, 0.0)
        return super()._get_qty_procurement()

    def _get_move_dests_initial_demand(self, move_dests):
        kit_bom = self.env['mrp.bom']._bom_find(self.product_id, bom_type='phantom')[self.product_id]
        if kit_bom:
            filters = {'incoming_moves': lambda m: True, 'outgoing_moves': lambda m: False}
            return move_dests._compute_kit_quantities(self.product_id, self.product_qty, kit_bom, filters)
        return super()._get_move_dests_initial_demand(move_dests)

    def _get_sale_order_line_product(self):
        return False