fix feed initial balance and report button

backend/apps/farms/tests.py

@@ -5,6 +5,7 @@ from rest_framework.test import APIClient
 
 from apps.accounts.models import User
 from apps.farms.models import Cycle, Flock, Kandang, Site
+from apps.operations.models import FeedSacks, ManualInput
 
 
 class FarmAPITests(TestCase):
@@ -85,3 +86,60 @@ class FarmAPITests(TestCase):
         self.assertEqual(response.status_code, 200, response.data)
         results = response.data["results"] if isinstance(response.data, dict) else response.data
         self.assertEqual(len(results), 2)
+
+    def test_set_initial_balance_seeds_feed_sack_snapshot_when_none_exist(self):
+        start = date.today()
+        cycle = Cycle.objects.create(
+            kandang=self.kandang,
+            total_days=35,
+            start_date=start,
+            end_date=start + timedelta(days=34),
+            doc_in_weight=40,
+            doc_in_count=9000,
+            status=Cycle.STATUS_ACTIVE,
+        )
+
+        self.client.force_authenticate(self.user)
+        response = self.client.post(
+            f"/api/v1/cycles/{cycle.pk}/initial-balance/",
+            {"date": start.isoformat(), "feed_in_manual": 120},
+            format="json",
+        )
+        self.assertEqual(response.status_code, 200, response.data)
+
+        row = FeedSacks.objects.get(cycle=cycle)
+        self.assertEqual(row.date, start)
+        self.assertEqual(row.in_total, 120)
+
+    def test_set_initial_balance_recomputes_existing_feed_sack_in_total(self):
+        start = date.today()
+        cycle = Cycle.objects.create(
+            kandang=self.kandang,
+            total_days=35,
+            start_date=start,
+            end_date=start + timedelta(days=34),
+            doc_in_weight=40,
+            doc_in_count=9000,
+            status=Cycle.STATUS_ACTIVE,
+        )
+        feed_row = FeedSacks.objects.create(
+            cycle=cycle,
+            date=start + timedelta(days=1),
+            in_today=4,
+            in_total=4,
+            out_today=0,
+            out_total=0,
+            feed_use_today=0,
+            feed_use_total=0,
+        )
+
+        self.client.force_authenticate(self.user)
+        response = self.client.post(
+            f"/api/v1/cycles/{cycle.pk}/initial-balance/",
+            {"date": start.isoformat(), "feed_in_manual": 120},
+            format="json",
+        )
+        self.assertEqual(response.status_code, 200, response.data)
+
+        feed_row.refresh_from_db()
+        self.assertEqual(feed_row.in_total, 124)

backend/apps/farms/views.py

@@ -10,6 +10,10 @@ from apps.accounts.models import User
 from apps.farms.models import Cycle, Flock, Kandang, Site
 from apps.farms.serializers import CycleSerializer, FlockSerializer, KandangSerializer, SiteSerializer
 from apps.operations.models import FeedSacks, ManualInput
+from apps.operations.services.feed_sacks import (
+    ensure_opening_feed_sack_snapshot,
+    recompute_feed_sack_in_totals,
+)
 from apps.operations.services.karung_web import KarungWebError, request_karung
 from apps.operations.services.manual_input import recompute_manual_totals
 
@@ -145,12 +149,8 @@ class CycleViewSet(viewsets.ModelViewSet):
         recompute_manual_totals(cycle)
 
         # FeedSacks in_total always includes the initial balance as its base.
-        running = cycle.feed_initial_balance
-        for fs_row in FeedSacks.objects.filter(cycle=cycle).order_by("date", "pk"):
-            running += fs_row.in_today
-            if fs_row.in_total != running:
-                fs_row.in_total = running
-                fs_row.save(update_fields=["in_total", "updated_at"])
+        recompute_feed_sack_in_totals(cycle)
+        ensure_opening_feed_sack_snapshot(cycle, balance_date)
 
         accuracy = None
         if feed_in_manual > 0 and iot_in is not None and iot_in > 0:

backend/apps/operations/services/feed_sacks.py

@@ -0,0 +1,32 @@
+from __future__ import annotations
+
+from datetime import date
+
+from apps.farms.models import Cycle
+from apps.operations.models import FeedSacks
+
+
+def recompute_feed_sack_in_totals(cycle: Cycle) -> None:
+    """Rebuild cumulative in_total from the cycle opening balance plus daily IoT in."""
+    running = cycle.feed_initial_balance
+    for fs_row in FeedSacks.objects.filter(cycle=cycle).order_by("date", "pk"):
+        running += fs_row.in_today
+        if fs_row.in_total != running:
+            fs_row.in_total = running
+            fs_row.save(update_fields=["in_total", "updated_at"])
+
+
+def ensure_opening_feed_sack_snapshot(cycle: Cycle, balance_date: date) -> FeedSacks | None:
+    """Seed a zero-activity snapshot when opening balance is saved before any IoT sync."""
+    if FeedSacks.objects.filter(cycle=cycle).exists():
+        return None
+    return FeedSacks.objects.create(
+        cycle=cycle,
+        date=balance_date,
+        in_today=0,
+        out_today=0,
+        in_total=cycle.feed_initial_balance,
+        out_total=0,
+        feed_use_today=0,
+        feed_use_total=0,
+    )