# @blade-and-brawn/calculator

Turns a player's raw activity performances (e.g. squat weight, mile time) into
per-attribute and overall "levels", by generating and interpolating strength/
performance standards across age, weight, and gender.

For the algorithm itself and the external standards it's based on, see
[`docs/level-calculator.md`](../../docs/level-calculator.md) at the repo root.

## Exports

- `LevelCalculator` — takes a `Standards` instance; `calculate(player, activityPerformances)`
  returns a level per `Attribute` plus an overall player level.
- `Standards` — takes a `StandardsConfig` (raw `StandardsData` + generation
  `StandardsParams`) and builds the full interpolatable standards table
  (stretching to more levels, generating missing ages/weights, etc.).
- Typebox schemas for the above (`models.ts`), re-exported from the package root.

## Usage

`StandardsConfig` normally comes from the database (see
`apps/api/src/services/calculator.ts`), not a static file, since standards
configs/datasets are editable from the admin portal:

```ts
import { LevelCalculator, Standards, type StandardsConfig } from "@blade-and-brawn/calculator";

const config: StandardsConfig = /* fetched from storage */;
const calculator = new LevelCalculator(new Standards(config));

const { player, attributes } = calculator.calculate(playerMetrics, activityPerformances);
```

## Structure

- `src/index.ts` — `LevelCalculator` and `Standards`
- `src/models.ts` — typebox schemas and types
- `src/avg-weights.ts` + `src/data/avg-weights.json` — average bodyweight by
  age/gender, used when generating age-based standards