'use strict';

/**
 * CHAIN v1 — does the shadow accrue on the SCHEDULED path, and does it leak?
 *
 * Two questions, and the second one is the gate.
 *
 * A5's whole finding was a factor that was built, correct, and never invoked.
 * A6's answer was to drive the real path rather than read the code. Same here:
 * this runs the REAL `snapshotService.runSnapshot` with injected deps and checks
 * that a `chain_shadow` block lands on a retention row — because evidence that
 * is generated and never persisted is that same failure one layer along.
 *
 * Then it proves the thing that actually matters: the served `p_win` is
 * BYTE-IDENTICAL with the shadow on and off. A shadow that moves a served number
 * is not a shadow, and no amount of labelling fixes it.
 */

const fs = require('fs');
const path = require('path');
const svc = require('../../src/services/snapshotService');
const retention = require('../../src/services/retentionService');
const cs = require('../../src/services/model/chainShadow');
const { nameKey } = require('../../src/utils/playerName');

const ROOT = path.join(__dirname, '..', '..');

/** A chainable Supabase stub — the context builders are gated on a client. */
function fakeSbTop() {
  const q = {};
  for (const m of ['select', 'eq', 'lte', 'gte', 'in', 'order', 'not', 'is']) q[m] = () => q;
  q.range = async () => ({ data: [], error: null });
  return { from: () => q };
}

function memCache() {
  const store = {};
  return {
    store,
    cacheGet: async (k) => (k in store ? store[k] : null),
    cacheSet: async (k, v) => { store[k] = v; },
  };
}

const PROPS = [
  { player: 'Mookie Betts', stat_type: 'hits', line: 0.5, over_odds: -130, under_odds: 100, book: 'dk' },
  { player: 'Aaron Judge', stat_type: 'hits', line: 0.5, over_odds: -140, under_odds: 110, book: 'dk' },
];

/** Served grades, with the counter's p_win — the number that must not move. */
const GRADES = [
  {
    player: 'Mookie Betts', stat_type: 'hits', line: 0.5, direction: 'over',
    grade: 'B', confidence: 61, p_win: 0.61, game_id: 'mlb:2026-08-12:LAD@SFG',
  },
  {
    player: 'Aaron Judge', stat_type: 'hits', line: 0.5, direction: 'under',
    grade: 'C', confidence: 42, p_win: 0.42, game_id: 'mlb:2026-08-12:NYY@BOS',
  },
];

const statcastRow = (key, over = {}) => ({
  player_key: key, role: 'batter',
  k_pct: 20.0, bb_pct: 9.0, barrel_pct: 10.0, hard_hit_pct: 43.0,
  avg_exit_velo: 90.5, avg_launch_angle: 13.0, bats: 'R', sample_pa: 420,
  ...over,
});

const STATCAST = new Map([
  [nameKey('Mookie Betts'), statcastRow(nameKey('Mookie Betts'))],
  [nameKey('Aaron Judge'), statcastRow(nameKey('Aaron Judge'), { barrel_pct: 16.0 })],
]);

/** Retention stub that captures rows instead of writing them. */
function captureRetention(sink) {
  return {
    ...retention,
    persist: async (rows) => { sink.push(...rows); return { attempted: rows.length, written: rows.length }; },
  };
}

/**
 * The challenger pass fetches park/weather and probable pitchers over the
 * network. Stubbed to no-ops so this suite is hermetic — the shadow reuses the
 * SAME statcast handle either way, which is the coupling under test.
 */
const inertChallengerDeps = () => ({
  notify: async () => {},
  gameBinder: { attachGameTimes: async () => ({ bound: 0, alreadyHad: 2, unresolved: 0, ambiguous: 0 }) },
  environmentContext: {
    buildContext: async () => ({
      _internals: { oppPitcherByTeam: new Map() },
      contextFor: () => null,
      stats: {},
    }),
  },
  challenger: { attachChallenger: async (g) => g },
  archetypeAxes: { classifyPlayer: () => null },
  contactChallenger: { buildRefs: () => ({}), attachContactChallenger: async (g) => g },
  projectionChallenger: { attachProjection: async (g) => g },
  loadArsenals: async () => new Map(),
  mlbAdapter: { getPlayerGameLog: async () => [] },
  lineupContext: { refreshContext: async () => ({ lineups: 0, opportunity: 0 }) },
  ledger: { recordPipelineGrades: async () => ({ written: 0 }), captureClosing: async () => {} },
  buildEspnIndex: async () => ({}),
  captureBookPrices: () => ({}),
  lockLineCapture: { buildLockRows: () => [], persist: async () => ({ retired: true, attempted: 0 }) },
});

function deps(cache, sink, over = {}) {
  return {
    ...inertChallengerDeps(),
    getOdds: async () => ({ sport: 'mlb', props: PROPS, provider: 'propline' }),
    gradeAndCacheSlate: async (_sport, props, opts) => {
      // The REAL collector path: rowsFromSides is what writes model_snapshots.
      for (const base of props) {
        const sides = GRADES.filter((g) => g.player === base.player)
          .map((g) => ({ ...g, stat_type: g.stat_type, line: g.line }));
        if (opts.onGraded) opts.onGraded({ ...base, game_id: sides[0] && sides[0].game_id }, sides);
      }
      await opts.cacheSet('grades:x', { grades: GRADES, updated_at: opts.now(), source: 'test' });
    },
    resolveStats: async () => ({ found: true, classifierInput: { hr: 30, avg: 0.29, ops: 0.93, k_rate: 20 } }),
    classify: require('../../src/services/archetypeService').classify,
    retention: captureRetention(sink),
    loadStatcast: async () => STATCAST,
    cacheGet: cache.cacheGet,
    cacheSet: cache.cacheSet,
    now: () => '2026-08-12T18:00:00Z',
    nowMs: () => 1000,
    ...over,
  };
}

describe('the chain shadow accrues on the REAL scheduled path', () => {
  it('a graded hits row lands with chain_shadow on it', async () => {
    const sink = [];
    await svc.runSnapshot('mlb', deps(memCache(), sink));
    const row = sink.find((r) => r.chain_shadow);
    expect(row).toBeDefined();
    expect(row.chain_shadow.chain_p).toBeGreaterThan(0);
    expect(row.chain_shadow.chain_p).toBeLessThan(1);
  });

  it('THE TRIPLE: chain_p and counter_p on the same row, both side-aligned', async () => {
    const sink = [];
    await svc.runSnapshot('mlb', deps(memCache(), sink));
    for (const r of sink.filter((x) => x.chain_shadow)) {
      expect(r.chain_shadow.side).toBe(r.side);
      expect(r.chain_shadow.counter_p).toBe(r.p_win);
      expect(r.chain_shadow.divergence)
        .toBeCloseTo(r.chain_shadow.chain_p - r.chain_shadow.counter_p, 4);
    }
    // `outcome` is the third leg and is written by the ordinary settle pass —
    // it is null here because these games have not been played.
    expect(sink.every((r) => r.outcome === undefined || r.outcome === null)).toBe(true);
  });

  it('an UNDER row carries 1 - p_over, so no later comparison inverts', async () => {
    const sink = [];
    await svc.runSnapshot('mlb', deps(memCache(), sink));
    const pair = sink.filter((r) => r.player_key === nameKey('Aaron Judge') && r.chain_shadow);
    const over = pair.find((r) => r.side === 'over');
    const under = pair.find((r) => r.side === 'under');
    if (over && under) expect(over.chain_shadow.chain_p + under.chain_shadow.chain_p).toBeCloseTo(1, 4);
  });

  it('every stored block declares itself UN-SERVABLE', async () => {
    const sink = [];
    await svc.runSnapshot('mlb', deps(memCache(), sink));
    for (const r of sink.filter((x) => x.chain_shadow)) {
      expect(r.chain_shadow.servable).toBe(false);
      expect(r.chain_shadow.status).toBe('UN-SERVABLE');
    }
  });

  it('the run reports its own counts, so a shadow reading NOTHING is visible', async () => {
    const r = await svc.runSnapshot('mlb', deps(memCache(), []));
    expect(r.chainShadow).toBeTruthy();
    expect(r.chainShadow.atoms).toBeGreaterThan(0);
    expect(r.chainShadow.servable).toBe(false);
  });

  it('no statcast profiles => no shadow, and the snapshot still succeeds', async () => {
    const sink = [];
    const r = await svc.runSnapshot('mlb', deps(memCache(), sink, { loadStatcast: async () => new Map() }));
    expect(r.status).toBe('ok');
    expect(sink.every((x) => !x.chain_shadow)).toBe(true);
  });

  it('a THROWING shadow never breaks the snapshot', async () => {
    const sink = [];
    const r = await svc.runSnapshot('mlb', deps(memCache(), sink, {
      chainShadow: { runShadow: () => { throw new Error('boom'); } },
    }));
    expect(r.status).toBe('ok');
    expect(r.gradeCount).toBe(2);
    expect(r.chainShadow).toBeNull();
  });
});

describe('CHAIN v2 — the hand split reaches the shadow through the REAL path', () => {
  const SPLIT = { vl: { pa: 220, atBats: 200, hits: 57 }, vr: { pa: 480, atBats: 430, hits: 95 } };

  /**
   * The A4 context resolver and the A6 key resolver, in miniature. The shadow
   * composes them: keys give the opposing starter's hand, the context gives the
   * hitter's own split. WITHOUT the keys the resolver's `throws` is null — the
   * A5 finding — and the split silently never fires, which is the exact failure
   * this order exists inside.
   */
  const factorContext = (prop, sport, keys) => ({
    spray: null, positionOaa: null, bats: 'R',
    throws: keys && keys.opposing_pitcher ? 'L' : null,
    pitcherHardHit: null, platoonSplits: SPLIT, as_of: '2026-08-12',
  });
  const KEYS = { opponent: 'Boston Red Sox', opposing_pitcher: 'Chris Sale', source: 'lineup_context+schedule', refused: null };

  /** A chainable Supabase stub — the context builders are gated on a client. */
  const fakeSb = () => {
    const q = {};
    for (const m of ['select', 'eq', 'lte', 'gte', 'in', 'order', 'not', 'is']) q[m] = () => q;
    q.range = async () => ({ data: [], error: null });
    q.then = undefined;
    return { from: () => q };
  };

  it('FIRES when both the context and the join keys are present', async () => {
    const sink = [];
    await svc.runSnapshot('mlb', deps(memCache(), sink, {
      supabase: fakeSb(),
      hitsFactorContext: { build: async () => factorContext },
      matchupKeys: { build: async () => Object.assign(() => KEYS, { stats: {} }) },
    }));
    const row = sink.find((r) => r.chain_shadow);
    expect(row).toBeDefined();
    expect(row.chain_shadow.platoon_applied).toBe(true);
    expect(row.chain_shadow.platoon_multiplier).toBeGreaterThan(0);
    expect(row.chain_shadow.platoon_reason).toBeNull();
  });

  it('WITHOUT the join keys it falls to a SEASON read — and says which', async () => {
    // This is the A5 shape reproduced deliberately: the context loads, the
    // hitter's own split is right there, and the pitcher hand is missing, so
    // the matchup conditioner cannot run. It must be visible, not silent.
    const sink = [];
    await svc.runSnapshot('mlb', deps(memCache(), sink, {
      supabase: fakeSb(),
      hitsFactorContext: { build: async () => factorContext },
      matchupKeys: { build: async () => null },
    }));
    const row = sink.find((r) => r.chain_shadow);
    expect(row.chain_shadow.platoon_applied).toBe(false);
    expect(row.chain_shadow.platoon_reason).toBe('no_pitcher_hand');
  });

  it('the run reports the matchup rate SEPARATELY from the fire rate', async () => {
    const r = await svc.runSnapshot('mlb', deps(memCache(), [], {
      supabase: fakeSb(),
      hitsFactorContext: { build: async () => factorContext },
      matchupKeys: { build: async () => Object.assign(() => KEYS, { stats: {} }) },
    }));
    // Two different questions: did the chain produce a probability at all, and
    // did it read tonight's matchup or this season's average?
    expect(r.chainShadow.readable).toBeGreaterThan(0);
    expect(r.chainShadow.platoon_applied).toBeGreaterThan(0);
  });

  it('THE HAND SPLIT MOVES THE NUMBER — otherwise plumbing it changed nothing', async () => {
    const withSplit = [];
    await svc.runSnapshot('mlb', deps(memCache(), withSplit, {
      supabase: fakeSb(),
      hitsFactorContext: { build: async () => factorContext },
      matchupKeys: { build: async () => Object.assign(() => KEYS, { stats: {} }) },
    }));
    const seasonOnly = [];
    await svc.runSnapshot('mlb', deps(memCache(), seasonOnly, {
      supabase: fakeSb(),
      hitsFactorContext: { build: async () => null },
      matchupKeys: { build: async () => null },
    }));
    const a = withSplit.find((r) => r.chain_shadow).chain_shadow.chain_p;
    const b = seasonOnly.find((r) => r.chain_shadow).chain_shadow.chain_p;
    expect(a).not.toBeCloseTo(b, 3);
  });
});

describe('CHAIN v3 — the opportunity term is REALLY fed, not a constant 4.1', () => {
  const KEYS_WITH_SLOT = (slot) => ({
    opponent: 'Boston Red Sox', opposing_pitcher: 'Chris Sale',
    batting_order: slot, source: 'lineup_context+schedule', refused: null,
  });
  const ctxFor = (prop, sport, keys) => ({
    spray: null, positionOaa: null, bats: 'R',
    throws: keys && keys.opposing_pitcher ? 'L' : null,
    pitcherHardHit: null, platoonSplits: null, as_of: '2026-08-12',
  });
  const withSlot = (slot, sink) => svc.runSnapshot('mlb', deps(memCache(), sink, {
    supabase: fakeSbTop(),
    hitsFactorContext: { build: async () => ctxFor },
    matchupKeys: { build: async () => Object.assign(() => KEYS_WITH_SLOT(slot), { stats: {} }) },
  }));

  it('a POSTED lineup slot reaches the chain and sets E[PA]', async () => {
    const sink = [];
    await withSlot(1, sink);
    const row = sink.find((r) => r.chain_shadow);
    expect(row.chain_shadow.opportunity_source).toBe('lineup_slot');
    expect(row.chain_shadow.expected_pa).toBe(4.65);      // leadoff, not 4.1
  });

  it('LEADOFF and the NINE HOLE do not get the same probability', async () => {
    // This is the v2 defect made a test: without the slot every hitter ran on
    // DEFAULT_PA (4.1), so the opportunity half of `rate x opportunity` was a
    // constant across the entire lineup.
    const lead = []; const nine = [];
    await withSlot(1, lead);
    await withSlot(9, nine);
    const a = lead.find((r) => r.chain_shadow).chain_shadow;
    const b = nine.find((r) => r.chain_shadow).chain_shadow;
    expect(a.expected_pa).toBeGreaterThan(b.expected_pa);
    expect(a.chain_p).not.toBeCloseTo(b.chain_p, 3);
  });

  it('an UNPOSTED lineup falls to a regular AND SAYS SO', async () => {
    const sink = [];
    await svc.runSnapshot('mlb', deps(memCache(), sink, {
      supabase: fakeSbTop(),
      hitsFactorContext: { build: async () => ctxFor },
      matchupKeys: { build: async () => Object.assign(() => KEYS_WITH_SLOT(null), { stats: {} }) },
    }));
    const row = sink.find((r) => r.chain_shadow);
    expect(row.chain_shadow.opportunity_source).toBe('default_regular');
    // 4.1 is "a regular", which is a claim about the league, not about him. It
    // must never be reported as if the lineup had been read.
    expect(row.chain_shadow.expected_pa).toBeNull();
  });

  it('the run reports posted-slot coverage separately from the fire rate', async () => {
    const r = await svc.runSnapshot('mlb', deps(memCache(), [], {
      supabase: fakeSbTop(),
      hitsFactorContext: { build: async () => ctxFor },
      matchupKeys: { build: async () => Object.assign(() => KEYS_WITH_SLOT(3), { stats: {} }) },
    }));
    expect(r.chainShadow.opportunity_posted).toBeGreaterThan(0);
    expect(r.chainShadow.props).toBeGreaterThan(0);
  });

  it('matchupKeys carries batting_order on EVERY return shape, including refusals', () => {
    // A field present only on the happy path is a field consumers cannot rely
    // on; the refusal shapes must carry it as an explicit null.
    const src = fs.readFileSync(path.join(ROOT, 'src/services/model/matchupKeys.js'), 'utf8');
    const returns = src.slice(src.indexOf('function resolve(prop)'));
    expect(returns).toMatch(/const empty = \{[^}]*batting_order: null/);
    expect((returns.match(/batting_order/g) || []).length).toBeGreaterThanOrEqual(4);
  });
});

describe('SERVED-GRADE-UNCHANGED — the gate this whole order sits behind', () => {
  /** Everything a user can see, pulled from what the snapshot actually wrote. */
  const servedShape = (store) => JSON.stringify({
    grades: (store['grades:mlb'] || {}).grades,
    snapshot: (store['snapshot:mlb:latest'] || {}).grades,
  });

  it('the served payload is BYTE-IDENTICAL with the shadow on and off', async () => {
    const on = memCache();
    await svc.runSnapshot('mlb', deps(on, []));

    const off = memCache();
    // `chainShadow: null` cannot be injected (the ?? default would re-require
    // it), so the OFF arm is a shadow service that reads and returns nothing.
    await svc.runSnapshot('mlb', deps(off, [], {
      chainShadow: { runShadow: () => ({ version: 'off', byKey: new Map(), summary: { atoms: 0, readable: 0, refused: 0, games: 0, games_read: 0, per_game: [] } }) },
    }));

    expect(servedShape(on)).toBe(servedShape(off));
  });

  it('p_win on every served grade is exactly the counter value', async () => {
    const cache = memCache();
    await svc.runSnapshot('mlb', deps(cache, []));
    const byPlayer = Object.fromEntries(GRADES.map((g) => [g.player, g.p_win]));
    for (const g of cache.store['grades:mlb'].grades) {
      expect(g.p_win).toBe(byPlayer[g.player]);
    }
  });

  it('NO served grade carries a chain field at all', async () => {
    const cache = memCache();
    await svc.runSnapshot('mlb', deps(cache, []));
    for (const g of cache.store['grades:mlb'].grades) {
      for (const k of Object.keys(g)) {
        expect(k).not.toMatch(/^chain/);
      }
    }
  });
});

describe('0 LEAKS — measured against the source, not asserted in prose', () => {
  const read = (p) => fs.readFileSync(path.join(ROOT, p), 'utf8');
  const walk = (dir, out = []) => {
    for (const e of fs.readdirSync(path.join(ROOT, dir), { withFileTypes: true })) {
      const rel = `${dir}/${e.name}`;
      if (e.isDirectory()) { if (e.name !== 'node_modules' && e.name !== '.next') walk(rel, out); }
      else if (/\.(js|ts|tsx)$/.test(e.name)) out.push(rel);
    }
    return out;
  };

  it('nothing under src/routes reads the chain shadow', () => {
    for (const f of walk('src/routes')) {
      const src = read(f);
      expect(src).not.toMatch(/chain_shadow|chainShadow|chain_p\b/);
    }
  });

  it('nothing in the web app reads the chain shadow', () => {
    for (const f of walk('web/src')) {
      const src = read(f);
      expect(src).not.toMatch(/chain_shadow|chainShadow|chain_p\b/);
    }
  });

  it('the ONLY writers are the shadow service, retention and the snapshot', () => {
    const writers = walk('src').filter((f) => /chain_shadow|chainShadow/.test(read(f)));
    expect(writers.sort()).toEqual([
      'src/services/model/chainShadow.js',
      'src/services/retentionService.js',
      'src/services/snapshotService.js',
    ]);
  });

  it('the shadow runs with requireCalibrated FALSE and says so where it is stored', () => {
    expect(read('src/services/model/chainShadow.js')).toMatch(/requireCalibrated:\s*false/);
    expect(cs.SHADOW_VERSION).toBe('chain-shadow@1');
  });

  it('CALIBRATION_DEPLOYED is still empty — nothing is served calibrated', () => {
    expect(svc.CALIBRATION_DEPLOYED).toEqual([]);
    expect(Object.isFrozen(svc.CALIBRATION_DEPLOYED)).toBe(true);
  });

  it('the counter still serves: probabilityEstimator is what analyzeViaEngine1 calls', () => {
    const engine = read('src/services/intelligence/analyzeViaEngine1.js');
    expect(engine).toMatch(/require\('\.\/probabilityEstimator'\)/);
    // And the engine knows nothing about the chain — the shadow is downstream.
    expect(engine).not.toMatch(/chainShadow|baseballChain/);
  });

  it('A8 and the factor freeze are untouched — factor_inputs still lands', async () => {
    const rows = require('../../src/services/retentionService').rowsFromSides(
      { player: 'X', stat_type: 'hits', line: 0.5 },
      [{ player: 'X', stat_type: 'hits', line: 0.5, direction: 'over', grade: 'B', factor_inputs: { v: 'hits-factors@1' } }],
      { snapshotId: 's', capturedAt: 't', sport: 'mlb', gameDate: '2026-08-12' },
    );
    expect(rows[0].factor_inputs).toEqual({ v: 'hits-factors@1' });
    expect(rows[0].chain_shadow).toBeNull();   // declared, so batches keep one shape
  });

  it('WNBA is untouched — the shadow is MLB-gated', async () => {
    const src = read('src/services/snapshotService.js');
    const i = src.indexOf('CHAIN v1 — THE SHADOW READ');
    const block = src.slice(i, src.indexOf('LINEUP + BASERUNNER CONTEXT', i));
    expect(block).toMatch(/if \(sp === 'mlb'\)/);
  });
});