[ADD] pos_order_workflow: Add Send to Pick button & backend picking workflow

- Added send to pick functionality in POS frontend to allow sending orders for
picking
- Created a new XML template to show the Send to Pick button on the POS
product screen
- Added a method check existing picking in pos order model to check if a picking
 exists for the order
- Implemented create picking set shipping method to set the shipping date and
create picking
- Updated process saved order method to handle picking creation and shipping
 logic
- Connected frontend and backend using RPC with order access token for
identification

This improves the POS workflow by linking order processing with the picking and
delivery system

Author: agir-odoo

pos_order_workflow/__init__.py

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+from . import models

pos_order_workflow/__manifest__.py

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+{
+    'name': 'POS Order Workflow',
+    'version': '1.0',
+    'summary': 'POS Order Workflow',
+    'author': 'Raghav Agiwal',
+    'depends': ['point_of_sale'],
+    "assets": {
+        "point_of_sale._assets_pos": [
+            "pos_order_workflow/static/src/*",
+        ],
+    },
+    'installable': True,
+    'application': True,
+    'auto_install': True,
+    'license': 'LGPL-3'
+}

pos_order_workflow/models/__init__.py

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+from . import pos_order

pos_order_workflow/models/pos_order.py

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+import logging
+from odoo import fields, models
+
+_logger = logging.getLogger(__name__)
+
+
+class PosOrder(models.Model):
+    _inherit = "pos.order"
+
+    def create_picking_set_shipping(self, order_id):
+        order = self.browse(order_id)
+        order.ensure_one()
+
+        if order.name == "/":
+            order.name = order._compute_order_name()
+
+        if not order.shipping_date:
+            order.shipping_date = fields.Date.today()
+
+        if not order.picking_ids:
+            order._create_order_picking()
+
+    def check_existing_picking(self, order_id):
+        order = self.search([('access_token', '=', order_id)], limit=1)
+        return {
+            'hasPicking': bool(order.picking_ids),
+            'trackingNumber': order.tracking_number or 'N/A'
+        }
+
+    def _process_saved_order(self, draft):
+        self.ensure_one()
+        if not draft:
+            self.action_pos_order_paid()
+
+            if not self.picking_ids:
+                self._create_order_picking()
+
+            self.picking_ids.scheduled_date = self.shipping_date
+            self._compute_total_cost_in_real_time()
+
+        if self.to_invoice and self.state == 'paid':
+            self._generate_pos_order_invoice()
+
+        return self.id

pos_order_workflow/static/src/send_to_pick.js

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+import { patch } from "@web/core/utils/patch";
+import { _t } from "@web/core/l10n/translation";
+import { useService } from "@web/core/utils/hooks";
+import { ProductScreen } from "@point_of_sale/app/screens/product_screen/product_screen";
+
+patch(ProductScreen.prototype, {
+    setup() {
+        super.setup(...arguments);
+        this.orm = useService("orm");
+    },
+
+    async checkOrderPickingStatus(order_id) {
+        const result = await this.orm.call("pos.order","check_existing_picking",["pos.order", order_id]);
+        return result;
+    },
+
+    async sendToPick() {
+        const currentOrder = this.pos.get_order();
+        if (!currentOrder) {
+            this.notification.add(_t("No active order found!"), { type: "warning" });
+            return;
+        }
+
+        const { hasPicking, trackingNumber } = await this.checkOrderPickingStatus(currentOrder.access_token);
+        if (hasPicking) {
+            this.notification.add(_t(`Order Already Processed. This order already has a picking associated with it.
+                Tracking Number : (${trackingNumber})`), {
+                type: "danger",
+            })
+            return;
+        }
+
+        if (!currentOrder.partner_id) {
+            this.notification.add(_t(`Select Customer`), {
+                type: "warning",
+            })
+            return;
+        }
+
+        if (!currentOrder.shipping_date) {
+            const today = new Date().toISOString().split("T")[0];
+            currentOrder.shipping_date = today;
+        }
+
+        const syncOrderResult = await this.pos.push_single_order(currentOrder);
+
+        await this.orm.call("pos.order", "create_picking_set_shipping", ["pos.order" , syncOrderResult[0].id]);
+
+        this.notification.add(_t("Order Sent to Pick"), {
+            type: "success",
+        });
+    },
+});

pos_order_workflow/static/src/send_to_pick.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<templates id="send_to_pick_template" xml:space="preserve">
+    <t t-name="pos_order.send_to_pick_button" t-inherit="point_of_sale.ProductScreen" t-inherit-mode="extension">
+        <xpath expr="//Numpad" position="after">
+            <button t-if="!currentOrder?.is_empty()" class="'button btn btn-primary btn-lg py-3 d-flex align-items-center justify-content-center flex-fill" t-on-click="sendToPick">Send To Pick</button>
+        </xpath>
+    </t>
+</templates>