import { describe, it, expect } from 'vitest';
import { demandWeight, releaseCurve } from '../../src/sim/demand';
import { getGame } from '../../src/sim/catalog';
import { START_DATE } from '../../src/sim/calendar';
import { testCatalog } from './helpers';

describe('demand', () => {
  it('is zero before release and peaks at launch', () => {
    expect(releaseCurve(-1)).toBe(0);
    expect(releaseCurve(0)).toBe(1.5);
    expect(releaseCurve(29)).toBe(1.5);
  });

  it('decays to 0.5 after two years and floors at 0.3', () => {
    expect(releaseCurve(730)).toBeCloseTo(0.5);
    expect(releaseCurve(5000)).toBeCloseTo(0.3);
  });

  it('never increases over time after release', () => {
    let prev = releaseCurve(0);
    for (let d = 10; d <= 6000; d += 10) {
      const v = releaseCurve(d);
      expect(v).toBeLessThanOrEqual(prev + 1e-9);
      prev = v;
    }
  });

  it('scales by base popularity', () => {
    const catalog = testCatalog();
    expect(demandWeight(getGame(catalog, 'sml'), START_DATE)).toBeCloseTo(0.95 * 1.5);
    expect(demandWeight(getGame(catalog, 'future'), START_DATE)).toBe(0);
  });
});