feat(projection): add complete observation day gate (issue #94)

src/fenris/projection.py

@@ -483,6 +483,31 @@ def _build_pu_context_line(conn, rate, days, clock_now):
     return "Percentage Used: %d%%" % pu
 
 
+# ---------------------------------------------------------------------------
+# Complete observation day gate (issue #94)
+# ---------------------------------------------------------------------------
+
+def _has_complete_local_day(conn):
+    """Check if at least one complete local observation day exists.
+
+    A complete local day is a full midnight-to-midnight calendar day
+    within a monitoring period that has usable observation evidence.
+    This is the prerequisite for showing an endurance outlook.
+    """
+    row = conn.execute(
+        "SELECT 1 FROM local_days WHERE complete = 1 LIMIT 1"
+    ).fetchone()
+    return row is not None
+
+
+def _count_complete_local_days(conn):
+    """Count the number of complete local observation days."""
+    row = conn.execute(
+        "SELECT COUNT(*) FROM local_days WHERE complete = 1"
+    ).fetchone()
+    return row[0] if row else 0
+
+
 # ---------------------------------------------------------------------------
 # Main projection function
 # ---------------------------------------------------------------------------
@@ -499,6 +524,30 @@ def compute_projection(conn, clock_now):
     tier, baseline, baseline_label, baseline_facts = _resolve_baseline(conn, current_segment)
     facts.extend(baseline_facts)
 
+    # --- Complete observation day gate (issue #94) ---
+    # An endurance outlook requires at least one complete local
+    # midnight-to-midnight calendar day with usable observation evidence.
+    has_complete_day = _has_complete_local_day(conn)
+    if not has_complete_day:
+        facts.append("waiting for a full local observation day")
+        return ProjectionResult(
+            confidence_state=ConfidenceState.UNSUPPORTED,
+            contributing_facts=facts,
+            headline_remaining_seconds=None,
+            scenario_range=None,
+            pu_context_line="Percentage Used: unknown" if _get_latest_pu(conn) is None else "Percentage Used: %d%%" % (_get_latest_pu(conn) or 0),
+            disclosure_text=list(DISCLOSURES),
+            baseline_tier=tier,
+            baseline_label=baseline_label,
+            regime_days=None,
+            habit_change_fact=None,
+            warming_fact=None,
+            staleness_fact=None,
+            degraded_identity_fact=None,
+            zero_rate_fact=None,
+            qualifying_days_progress=None,
+        )
+
     segment_days = _get_days_in_segment(conn, current_segment["opened_at"]) if current_segment else _get_all_days(conn)
     all_days = _get_all_days(conn)