import type { Gender, Metrics, StandardUnit } from "@blade-and-brawn/domain";
import avgWeightDataJson from "./data/avg-weights.json" with { 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;
};