import { describe, it, expect } from 'vitest';
import { scopeScalarsToTimeframe, UNAVAILABLE } from '../insightScope.ts';

/**
 * Real shape of the FCR page's 7-day history for this cycle: the IoT scale
 * stopped reporting at day 38 and has written 0 ever since, and the flock was
 * fully harvested on day 48 so `ayam` ends at 0 too.
 */
const ROWS = [
  { day: 42, fcr: 1.8, pakan: 1064, bobot_kg: 0, ayam: 1424 },
  { day: 44, fcr: 1.81, pakan: 1067, bobot_kg: 0, ayam: 1314 },
  { day: 46, fcr: 1.82, pakan: 1072, bobot_kg: 0, ayam: 1253 },
  { day: 47, fcr: 1.78, pakan: 1073, bobot_kg: 1.38, ayam: 822 },
  { day: 48, fcr: 1.7, pakan: 1073, bobot_kg: 0, ayam: 0 },
];

const spec = (agg: 'last' | 'lastValid') => ({
  historyKey: 'tren',
  derive: {
    bobot_kg_out: { field: 'bobot_kg', agg },
    ayam_out: { field: 'ayam', agg },
  },
});

describe('lastValid aggregation', () => {
  it('last takes the trailing zero — the reported bug', () => {
    const out = scopeScalarsToTimeframe({ tren: ROWS }, 'mingguan', spec('last'));
    expect(out.bobot_kg_out).toBe(0);
    expect(out.ayam_out).toBe(0);
  });

  it('lastValid walks back past the zeros', () => {
    const out = scopeScalarsToTimeframe({ tren: ROWS }, 'mingguan', spec('lastValid'));
    expect(out.bobot_kg_out).toBe(1.38);
    expect(out.ayam_out).toBe(822);
  });

  it('reports unavailable when every reading in the window is zero', () => {
    const allZero = [
      { day: 47, bobot_kg: 0, ayam: 0 },
      { day: 48, bobot_kg: 0, ayam: 0 },
    ];
    const out = scopeScalarsToTimeframe({ tren: allZero }, 'mingguan', spec('lastValid'));
    expect(out.bobot_kg_out).toBe(UNAVAILABLE);
    expect(out.ayam_out).toBe(UNAVAILABLE);
  });

  it('leaves a genuine non-zero final reading alone', () => {
    const rows = [
      { day: 47, bobot_kg: 1.3, ayam: 900 },
      { day: 48, bobot_kg: 1.45, ayam: 850 },
    ];
    const out = scopeScalarsToTimeframe({ tren: rows }, 'mingguan', spec('lastValid'));
    expect(out.bobot_kg_out).toBe(1.45);
    expect(out.ayam_out).toBe(850);
  });
});