erp5_core: add MovingAverageSetToZeroWhenNegatif valuation method

product/ERP5/Tool/SimulationTool.py

@@ -1847,6 +1847,7 @@ class SimulationTool(BaseTool):
         WeightedAverage
         MonthlyWeightedAverage
         MovingAverage
+        MovingAverageSetToZeroWhenNegatif
       When using a specific valuation method, a resource_uid is expected
       as well as one of (section_uid or node_uid).
       """
@@ -1868,7 +1869,7 @@ class SimulationTool(BaseTool):
         return total_result
 
       if valuation_method not in ('Fifo', 'Filo', 'WeightedAverage',
-        'MonthlyWeightedAverage', 'MovingAverage'):
+        'MonthlyWeightedAverage', 'MovingAverage', 'MovingAverageSetToZeroWhenNegatif'):
         raise ValueError("Invalid valuation method: %s" % valuation_method)
 
       if unit_price and valuation_method in ('Fifo', 'Filo'):

product/ERP5/bootstrap/erp5_core/SkinTemplateItem/portal_skins/erp5_core/Resource_zGetAssetPrice.sql

@@ -64,6 +64,26 @@ where
   <dtml-var where_expression>
 order by date
 
+<dtml-elif "'MovingAverageSetToZeroWhenNegatif'==valuation_method">
+/*
+Very similar to WeightedAverage except it set total_asset_price to zero
+when total_quantity is negatif
+*/
+
+set @total_asset_price=0, @total_quantity=0
+<dtml-var sql_delimiter>
+select
+    (@incoming_total_price:=IF(quantity>0, total_price, 0)) as incoming_total_price,
+    (@base_total_quantity:= @total_quantity+GREATEST(0, quantity)) as dummy,
+    (@unit_price:=IF(@base_total_quantity=0, 0, (@total_asset_price+@incoming_total_price)/@base_total_quantity)) as unit_price,
+    (@total_asset_price:= GREATEST(@total_asset_price + @incoming_total_price + LEAST(0, quantity) * @unit_price, 0)) as total_asset_price,
+    (@total_quantity:=GREATEST(@total_quantity+quantity, 0)) as dummy2
+from
+   stock, catalog
+where
+  <dtml-var where_expression>
+order by date
+
 <dtml-elif "valuation_method=='Fifo'">
 
 /*