[IMP] stock: products availability

Add two compute fields for picking model:
  - `products_availability` will indicate the products' availability for
delivery (outgoing picking).
  - `products_availability_state` is used to decorate the field in the
    list view.

task-2058495

addons/stock/models/stock_picking.py

@@ -371,6 +371,12 @@ class Picking(models.Model):
     immediate_transfer = fields.Boolean(default=False)
     package_level_ids = fields.One2many('stock.package_level', 'picking_id')
     package_level_ids_details = fields.One2many('stock.package_level', 'picking_id')
+    products_availability = fields.Char(
+        string="Product Availability", compute='_compute_products_availability')
+    products_availability_state = fields.Selection([
+        ('available', 'Available'),
+        ('expected', 'Expected'),
+        ('late', 'Late')], compute='_compute_products_availability')
 
     _sql_constraints = [
         ('name_uniq', 'unique(name, company_id)', 'Reference must be unique per company!'),
@@ -387,6 +393,25 @@ class Picking(models.Model):
         for picking in self:
             picking.delay_alert_date = delay_alert_date_data.get(picking.id, False)
 
+    @api.depends('move_lines', 'state')
+    def _compute_products_availability(self):
+        self.products_availability = False
+        self.products_availability_state = 'available'
+        pickings = self.filtered(lambda picking: picking.state not in ['cancel', 'draft', 'done'] and picking.picking_type_code == 'outgoing')
+        for picking in pickings:
+            forecast_data = []
+            for move in picking.move_lines:
+                if move.json_forecast:
+                    forecast_data.append(json.loads(move.json_forecast))
+            picking.products_availability = 'Available'
+            forecast_data.sort(key=lambda line: line.get('sortingDate', ''), reverse=True)
+            if len(forecast_data) > 0 and forecast_data[0].get('sortingDate', False):
+                picking.products_availability = _('Exp %s', forecast_data[0]['expectedDate'])
+                picking.products_availability_state = 'late' if forecast_data[0]['isLate'] else 'expected'
+            elif any(not data.get('reservedAvailability', False) for data in forecast_data):
+                picking.products_availability = 'Not Available'
+                picking.products_availability_state = 'late'
+
     @api.depends('picking_type_id.show_operations')
     def _compute_show_operations(self):
         for picking in self:

addons/stock/views/stock_picking_views.xml

@@ -199,6 +199,10 @@
                     <field name="partner_id" optional="show"/>
                     <field name="signature" string="Signed" optional="hide" widget="boolean" groups="stock.group_stock_sign_delivery"/>
                     <field name="user_id" optional="hide" widget="many2one_avatar_user"/>
+                    <field name="products_availability_state" invisible="1"/>
+                    <field name="products_availability" optional="show"
+                        decoration-danger="products_availability_state == 'late'"
+                        decoration-warning="products_availability_state == 'expected'"/>
                     <field name="date" invisible="1"/>
                     <field name="scheduled_date" optional="show" decoration-danger="scheduled_date &lt; current_date and state not in ('done', 'cancel')"/>
                     <field name="origin" optional="show"/>