// ============================================================
// BILIRUBIN parity tests — drives the TS port against vectors
// captured from the authoritative vanilla implementation.
// Regenerate vectors with `node scripts/capture-calc-vectors.js`.
// ============================================================

import { describe, expect, it } from 'vitest';
import * as fs from 'node:fs';
import * as path from 'node:path';
import { classifyBhutani, classifyAapBili, type BiliRisk } from './bilirubin';

interface BhutaniCase {
  name: string;
  inputs: { hours: number; tsb: number };
  output: { p95: number; p75: number; p40: number; zone: string };
}
interface AapCase {
  name: string;
  inputs: { gaWeeks: number; hours: number; tsb: number; risk: BiliRisk };
  output: { photoThreshold: number; exchangeThreshold: number; status: string };
}
interface Vectors {
  bhutani: BhutaniCase[];
  aap: AapCase[];
}

const vectors: Vectors = JSON.parse(
  fs.readFileSync(path.join(__dirname, '..', '..', 'e2e', 'fixtures', 'calc-vectors.json'), 'utf8'),
);

describe('Bhutani nomogram — parity with vanilla calculators.js', () => {
  it.each(vectors.bhutani)('$name', ({ inputs, output }) => {
    const actual = classifyBhutani(inputs.hours, inputs.tsb);
    expect(actual.p95).toBeCloseTo(output.p95, 10);
    expect(actual.p75).toBeCloseTo(output.p75, 10);
    expect(actual.p40).toBeCloseTo(output.p40, 10);
    expect(actual.zone).toBe(output.zone);
  });
});

describe('AAP 2022 bilirubin — parity with vanilla calculators.js', () => {
  it.each(vectors.aap)('$name', ({ inputs, output }) => {
    const actual = classifyAapBili(inputs.gaWeeks, inputs.hours, inputs.tsb, inputs.risk);
    expect(actual.photoThreshold).toBeCloseTo(output.photoThreshold, 10);
    expect(actual.exchangeThreshold).toBeCloseTo(output.exchangeThreshold, 10);
    expect(actual.status).toBe(output.status);
  });
});