You can now calculate costs from direct resources and indirect task-based resources

src/ifcopenshell-python/ifcopenshell/api/cost/calculate_cost_item_resource_value.py

@@ -0,0 +1,56 @@
+import ifcopenshell.api
+import ifcopenshell.util.date
+
+
+class Usecase:
+    def __init__(self, file, **settings):
+        self.file = file
+        self.settings = {"cost_item": None}
+        for key, value in settings.items():
+            self.settings[key] = value
+
+    def execute(self):
+        for cost_value in self.settings["cost_item"].CostValues or []:
+            ifcopenshell.api.run(
+                "cost.remove_cost_value", self.file, parent=self.settings["cost_item"], cost_value=cost_value
+            )
+
+        resources = []
+        for rel in self.settings["cost_item"].Controls or []:
+            for related_object in rel.RelatedObjects:
+                if related_object.is_a("IfcConstructionResource"):
+                    resources.append(related_object)
+                elif related_object.is_a("IfcTask"):
+                    for rel2 in related_object.OperatesOn or []:
+                        for related_object2 in rel2.RelatedObjects:
+                            if related_object2.is_a("IfcConstructionResource"):
+                                resources.append(related_object2)
+
+        total_cost = 0
+        for resource in resources:
+            cost = self.get_cost(resource)
+            quantity = self.get_quantity(resource)
+            if not cost or not quantity:
+                continue
+            total_cost += cost * quantity
+
+        if total_cost:
+            cost_value = ifcopenshell.api.run("cost.add_cost_value", self.file, parent=self.settings["cost_item"])
+            cost_value.AppliedValue = self.file.createIfcMonetaryMeasure(total_cost)
+
+    def get_cost(self, resource):
+        total = 0
+        for cost_value in resource.BaseCosts or []:
+            total += cost_value.AppliedValue.wrappedValue if cost_value.AppliedValue else 0
+        return total
+
+    def get_quantity(self, resource):
+        total = 0
+        if resource.BaseQuantity:
+            return resource.BaseQuantity[3]
+        if resource.Usage and resource.Usage.ScheduleWork:
+            # For now we assume either hourly or daily depending on how duration is stored
+            duration = ifcopenshell.util.date.ifc2datetime(resource.Usage.ScheduleWork)
+            if duration.days:
+                return duration.days
+            return duration.seconds / 60 / 60