// Session 45 — snapshot pipeline. Every dependency is injected, so the whole
// cycle runs with zero network / Redis.

const svc = require('../../src/services/snapshotService');

// A tiny in-memory cache to back cacheGet/cacheSet.
function memCache() {
  const store = {};
  return {
    store,
    cacheGet: async (k) => (k in store ? store[k] : null),
    cacheSet: async (k, v) => { store[k] = v; },
  };
}

const sampleProps = [
  { player: 'Aaron Judge', stat_type: 'total_bases', line: 1.5, over_odds: -115, under_odds: -105, book: 'dk' },
  { player: 'Mookie Betts', stat_type: 'hits', line: 1.5, over_odds: -130, under_odds: 100, book: 'dk' },
];

// Fake grader output captured via gradeAndCacheSlate's cacheSet.
function fakeGradeAndCacheSlate(grades) {
  return async (_sport, _props, opts) => {
    await opts.cacheSet(`grades:x`, { grades, updated_at: opts.now(), source: 'test' });
    return { written: true, count: grades.length };
  };
}

describe('computeLineDeltas', () => {
  it('detects movements >= 0.5 and ignores noise', () => {
    const prev = [{ player: 'A', stat_type: 'pts', direction: 'over', gradedAt: { line: 26.5 } }];
    const cur = [
      { player: 'A', stat_type: 'pts', direction: 'over', line: 27.5, grade: 'A' }, // +1.0
      { player: 'B', stat_type: 'reb', direction: 'over', line: 9.5, grade: 'B' },   // no prev
    ];
    const d = svc.computeLineDeltas(cur, prev);
    expect(d).toHaveLength(1);
    expect(d[0].delta).toBe(1);
    expect(d[0].gradedLine).toBe(26.5);
    expect(d[0].currentLine).toBe(27.5);
  });

  it('marks direction toward/away by graded side', () => {
    const prev = [
      { player: 'A', stat_type: 'pts', direction: 'over', gradedAt: { line: 26.5 } },
      { player: 'B', stat_type: 'pts', direction: 'under', gradedAt: { line: 20.5 } },
    ];
    const cur = [
      { player: 'A', stat_type: 'pts', direction: 'over', line: 28, grade: 'A' },   // over + rising = toward
      { player: 'B', stat_type: 'pts', direction: 'under', line: 22, grade: 'B' },  // under + rising = away
    ];
    const d = svc.computeLineDeltas(cur, prev);
    expect(d.find((x) => x.player === 'A').direction).toBe('toward');
    expect(d.find((x) => x.player === 'B').direction).toBe('away');
  });
});

describe('generateTickerEvents', () => {
  const grades = [
    { player: 'Aaron Judge', stat_type: 'TB', line: 1.5, direction: 'over', grade: 'A+', archetype: 'BOMBER' },
    { player: 'Mookie Betts', stat_type: 'Hits', line: 1.5, direction: 'over', grade: 'B' },
  ];
  it('emits a SCAN summary + GRADE events for A/A+ only', () => {
    const ev = svc.generateTickerEvents('mlb', grades, [], '2026-06-18T20:00:00Z');
    expect(ev[0].tag).toBe('SCAN');
    expect(ev[0].text).toContain('2 props graded');
    const grade = ev.find((e) => e.tag === 'A+');
    expect(grade.text).toContain('BOMBER');
    expect(grade.text).toContain('Judge');
    expect(ev.find((e) => e.tag === 'B')).toBeUndefined(); // only top grades
  });
  it('emits MOVE events for |delta| >= 1.0', () => {
    const deltas = [{ player: 'V Wemby', stat: 'pts', side: 'O', gradedLine: 26.5, currentLine: 27.5, delta: 1.0, direction: 'toward' }];
    const ev = svc.generateTickerEvents('nba', grades, deltas, 't');
    const move = ev.find((e) => e.tag === 'MOVE');
    expect(move.text).toContain('▲+1');
  });
});

describe('runSnapshot (fully injected)', () => {
  const baseGrades = [
    { player: 'Aaron Judge', stat_type: 'total_bases', line: 1.5, direction: 'over', grade: 'A+', confidence: 80 },
    { player: 'Mookie Betts', stat_type: 'hits', line: 1.5, direction: 'over', grade: 'B', confidence: 65 },
  ];
  const deps = (cache) => ({
    getOdds: async () => ({ sport: 'mlb', props: sampleProps, provider: 'propline' }),
    gradeAndCacheSlate: fakeGradeAndCacheSlate(baseGrades),
    resolveStats: async (player) => (player === 'Aaron Judge'
      ? { found: true, classifierInput: { hr: 34, avg: 0.28, ops: 0.95, k_rate: 28 } }
      : { found: false }),
    classify: require('../../src/services/archetypeService').classify,
    cacheGet: cache.cacheGet,
    cacheSet: cache.cacheSet,
    now: () => '2026-06-18T20:00:00Z',
    nowMs: () => 1000,
  });

  it('returns an ok summary with gradeCount + topGrades', async () => {
    const cache = memCache();
    const r = await svc.runSnapshot('mlb', deps(cache));
    expect(r.status).toBe('ok');
    expect(r.gradeCount).toBe(2);
    expect(r.topGrades[0].player).toBe('Aaron Judge');
    expect(r.topGrades[0].archetype).toBe('BOMBER'); // classified from real stats
  });

  it('writes snapshot:{sport}:latest + grades:{sport} with gradedAt + archetype', async () => {
    const cache = memCache();
    await svc.runSnapshot('mlb', deps(cache));
    const snap = cache.store['snapshot:mlb:latest'];
    expect(snap).toBeTruthy();
    expect(snap.grades[0].gradedAt.line).toBe(1.5);
    expect(snap.grades[0].gradedAt.timestamp).toBe('2026-06-18T20:00:00Z');
    expect(snap.grades[0].archetype).toBe('BOMBER');
    expect(cache.store['grades:mlb'].grades).toHaveLength(2);
  });

  it('rotates latest → previous and computes deltas on the second run', async () => {
    const cache = memCache();
    let line = 1.5;
    const d = deps(cache);
    d.gradeAndCacheSlate = (sport, props, opts) => fakeGradeAndCacheSlate([
      { player: 'Aaron Judge', stat_type: 'total_bases', line, direction: 'over', grade: 'A+', confidence: 80 },
    ])(sport, props, opts);
    await svc.runSnapshot('mlb', d);
    line = 2.5; // line moved +1.0
    const r2 = await svc.runSnapshot('mlb', d);
    expect(cache.store['snapshot:mlb:previous']).toBeTruthy();
    expect(r2.deltas).toBe(1);
  });

  it('pushes ticker events (capped) into ticker:items', async () => {
    const cache = memCache();
    await svc.runSnapshot('mlb', deps(cache));
    const items = cache.store['ticker:items'];
    expect(Array.isArray(items)).toBe(true);
    expect(items.find((e) => e.tag === 'SCAN')).toBeTruthy();
    expect(items.length).toBeLessThanOrEqual(50);
  });

  it('skips gracefully on an empty slate', async () => {
    const cache = memCache();
    const d = deps(cache);
    d.getOdds = async () => ({ sport: 'mlb', props: [] });
    const r = await svc.runSnapshot('mlb', d);
    expect(r.status).toBe('skipped');
    expect(r.gradeCount).toBe(0);
  });
});