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WESP_REL/app/lab/calc/derived.py

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+from __future__ import annotations
+
+from typing import Any
+
+from app.lab.calc.nutrients import rnb
+
+
+def apply_content_derived(
+    content_by_key: dict[str, float | None],
+    defn: dict[str, Any],
+    *,
+    total_kg: float = 0,
+    heads_per_trip: int = 1,
+    profile_mass_kg: float | None = None,
+    compound_mode: bool = False,
+) -> float | None:
+    derived = defn.get("derived")
+    if derived == "alias":
+        return content_by_key.get(defn.get("alias_of"))
+    if derived == "pct_of_dm":
+        src = content_by_key.get(defn.get("from_key"))
+        dm = content_by_key.get("dry_matter")
+        if src is None or not dm or dm <= 0:
+            return None
+        return src / dm * 100.0
+    if derived == "g_per_kg_dm":
+        src = content_by_key.get(defn.get("from_key"))
+        dm = content_by_key.get("dry_matter")
+        if src is None or not dm or dm <= 0:
+            return None
+        if compound_mode:
+            return src
+        return src / (dm / 1000.0)
+    if derived == "nel_per_kg_dm":
+        dm = content_by_key.get("dry_matter")
+        nel = content_by_key.get("nel")
+        if not dm or dm <= 0 or nel is None:
+            return None
+        if compound_mode:
+            return nel
+        return nel / (dm / 1000.0)
+    if derived == "ratio":
+        num = content_by_key.get(defn.get("ratio_num"))
+        den = content_by_key.get(defn.get("ratio_den"))
+        if num is None or den is None or den == 0:
+            return None
+        return num / den
+    if derived == "dm_pct_bw":
+        dm = content_by_key.get("dry_matter")
+        if dm is None or not profile_mass_kg or profile_mass_kg <= 0:
+            return None
+        return (dm / 1000.0 / profile_mass_kg) * 100.0
+    if derived == "ration_pct_bw":
+        if not profile_mass_kg or profile_mass_kg <= 0 or total_kg <= 0:
+            return None
+        heads = max(int(heads_per_trip or 1), 1)
+        kg_per_head = total_kg / heads
+        return (kg_per_head / profile_mass_kg) * 100.0
+    if derived in ("rnb", "bra_rnb"):
+        return rnb(
+            content_by_key.get("crude_protein"),
+            content_by_key.get("usp"),
+        )
+    return None