'use strict';

/**
 * Which stats serve a calibrated number, and on what basis.
 *
 * The claim that survived on this sample is the bias DIRECTION, tested model-free
 * and map-free. What did not survive is any certification of a specific map's
 * stability. These lock that distinction into the serving path.
 */

const snapshotService = require('../../src/services/snapshotService');
const lp = require('../../src/services/model/lowParamCalibrator');

describe('the deploy set rides a low-parameter correction, not isotonic', () => {
  it('serves the two stats whose correction beat RAW out-of-sample', () => {
    expect(snapshotService.CALIBRATION_DEPLOYED).toEqual(['hits', 'total_bases']);
  });

  it('WITHDRAWS rbi — the low-parameter fit does not beat raw', () => {
    // rbi was deployed at ced4042 on isotonic. Its CI vs raw is [-0.0007, 0],
    // which touches zero, so it serves raw again.
    expect(snapshotService.CALIBRATION_DEPLOYED).not.toContain('rbi');
  });

  it('does NOT serve runs — its fitted slope would invert the forecast', () => {
    expect(snapshotService.CALIBRATION_DEPLOYED).not.toContain('runs');
  });

  it('labels the basis honestly: direction robust, magnitude provisional', () => {
    for (const stat of snapshotService.CALIBRATION_DEPLOYED) {
      expect(snapshotService.CALIBRATION_BASIS[stat]).toBe('direction_robust_magnitude_provisional');
    }
  });

  it('the served correction cannot encode a single odd day', () => {
    // Two parameters over the whole curve is the entire reason for the swap.
    expect(typeof lp.fitPlatt).toBe('function');
    expect(lp.MIN_SLOPE).toBeGreaterThan(0);
  });

  it('is frozen, so a stat cannot be added at runtime', () => {
    expect(Object.isFrozen(snapshotService.CALIBRATION_DEPLOYED)).toBe(true);
    expect(() => { snapshotService.CALIBRATION_DEPLOYED.push('rbi'); }).toThrow();
  });
});