# -*- coding: utf-8 -*-
from odoo import models, api

class SaleOrderLine(models.Model):
    _inherit = 'sale.order.line'
    
    def _link_to_po_lines(self, po):
        """Map SO lines back to PO lines for proper receipt/delivery linking."""
        for sol, pol in zip(self, po.order_line):
            # For intercompany automation matching logic if needed later
            pass

class StockPicking(models.Model):
    _inherit = 'stock.picking'

    def button_validate(self):
        res = super(StockPicking, self).button_validate()
        for picking in self:
            if picking.picking_type_code == 'outgoing' and picking.sale_id:
                # If this is a delivery for an intercompany SA, auto validate the receipt on the caller's side
                po = self.env['purchase.order'].sudo().search([('name', '=', picking.sale_id.client_order_ref)], limit=1)
                if po and picking.company_id.intercompany_auto_invoice:
                    # Time to validate PO receipts (for intercompany sync)
                    # For a real implementation, you would dynamically match stock moves. 
                    # Simulating auto-receipt for simplicity in Week 3 demonstration
                    receipts = po.picking_ids.filtered(lambda p: p.state not in ['done', 'cancel'])
                    for receipt in receipts:
                        receipt.sudo().action_assign()
                        for move in receipt.move_ids_without_package:
                            move.quantity = move.product_uom_qty
                        receipt.sudo().button_validate()
                        
                    # Auto generate invoice on SO side
                    picking.sale_id.sudo()._create_invoices()
                    invoices = picking.sale_id.invoice_ids
                    for inv in invoices:
                        inv.action_post()
                        
                    # Auto generate vendor bill on PO side
                    po.sudo().action_create_invoice()
                    bills = po.invoice_ids
                    for bill in bills:
                        bill.action_post()
        return res