Move domain models into domain package with schemas and validate with zod + elysia. Some maintenence as well

packages/calculator/src/avg-weights.ts

@@ -0,0 +1,30 @@
+import type { Gender, Metrics, StandardUnit } from "@blade-and-brawn/domain";
+import avgWeightDataJson from "./data/avg-weights.json" assert { type: "json" };
+
+export const getAvgWeight = (gender: Gender, age: number) => {
+    type AvgWeightData = {
+        metadata: {
+            unit: StandardUnit;
+        };
+        weights: Metrics[];
+    };
+    const avgWeightData = avgWeightDataJson as AvgWeightData;
+
+    const avgWeights = avgWeightData.weights.filter((a) => a.gender === gender);
+    const firstAvgWeight = avgWeights[0];
+    if (!firstAvgWeight) throw new Error("No average weights");
+
+    const closest = {
+        diff: Math.abs(firstAvgWeight.age - age),
+        avg: firstAvgWeight,
+    };
+    for (const avg of avgWeights) {
+        const diff = Math.abs(avg.age - age);
+        if (diff < closest.diff) {
+            closest.diff = diff;
+            closest.avg = avg;
+        }
+    }
+
+    return closest.avg.weight;
+};