/**
 * reminderScheduler tests.
 *
 * Asserts that the reminder scan:
 *   - Selects ONLY shared (isShared=true) AND timed (allDay=false) events
 *     in the catch-up window (now, now+16min] (D-05/D-07)
 *   - Does NOT dispatch reminders for all-day events (D-07)
 *   - Does NOT dispatch reminders for non-shared (personal) events (D-05)
 *   - Does NOT dispatch for an event whose dtstart <= now (already started)
 *   - Fires EXACTLY ONCE across consecutive ticks while the event sits in the window
 *     (per-uid exactly-once dedup; cross-tick double-fire prevention)
 *   - Recovers from a missed/late cron tick: fires at a later scan when event is
 *     still in (now, now+16min] even if the ideal 15-min tick was skipped
 *   - WR-01: sentReminders.set(uid) is called AFTER dispatch (at-least-once delivery)
 *   - CR-01: sentReminders Map is pruned of started events after each scan
 *   - D-16: empty push_subscriptions -> zero sends / no crash
 *   - T-05-19: per-subscription error isolation
 *
 * NEW (Plan 11-02):
 *   - NOTIF-04: fires at T-reminderLeadMinutes (variable per-event lead), not fixed 16-min window
 *   - NOTIF-05: NULL lead → no push; timed 0-lead → no push; personal events DO dispatch
 *   - NOTIF-06: uid:dtstartMs compound dedup; rescheduled dtstart re-fires; all-day 9 AM branch
 *   - D-09: humanized push body (humanizeLeadMinutes)
 *
 * Run: pnpm --filter @familysync/api exec vitest run tests/broker/reminderScheduler.test.ts
 */

import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest';

// Mock the DB so we can control what events are returned
vi.mock('../../src/db/client.js', () => ({
  db: {
    select: vi.fn(),
  },
}));

// Mock pushDispatcher so no real push occurs
vi.mock('../../src/lib/pushDispatcher.js', () => ({
  dispatchPush: vi.fn().mockResolvedValue(undefined),
}));

// ── Helpers ───────────────────────────────────────────────────────────────────

/**
 * Make a select mock chain that resolves `.where()` with the given rows.
 * Supports both one-join and two-join chains (from().innerJoin[.innerJoin]().where()).
 */
function makeSelectMock(rows: unknown[]) {
  const whereResolve = vi.fn().mockResolvedValue(rows);
  const innerJoinLevel2 = {
    where: whereResolve,
    innerJoin: vi.fn().mockReturnValue({ where: whereResolve }),
  };
  return {
    from: vi.fn().mockReturnValue({
      innerJoin: vi.fn().mockReturnValue(innerJoinLevel2),
    }),
  } as never;
}

/**
 * Setup the db.select mock so the FIRST call (timed query) returns `timedRows`
 * and the SECOND call (all-day query) returns `allDayRows` (default empty).
 *
 * runReminderCheck() issues two sequential db.select() calls:
 *   1st: timed events query
 *   2nd: all-day events query
 */
function mockTwoQueries(
  db: { select: ReturnType<typeof vi.fn> },
  timedRows: unknown[],
  allDayRows: unknown[] = [],
) {
  db.select
    .mockReturnValueOnce(makeSelectMock(timedRows))
    .mockReturnValueOnce(makeSelectMock(allDayRows));
}

function makeEventRow(overrides: {
  uid?: string;
  title?: string;
  dtstartUtc?: Date | null;
  dtstartDate?: string | null;
  allDay?: boolean;
  isShared?: boolean;
  reminderLeadMinutes?: number | null;
  subId?: number | null;
  subUserId?: number | null;
  subEndpoint?: string;
  subP256dh?: string;
  subAuth?: string;
}) {
  return {
    uid: overrides.uid ?? 'test-uid-1',
    title: overrides.title ?? 'Test Event',
    dtstartUtc: overrides.dtstartUtc !== undefined ? overrides.dtstartUtc : null,
    dtstartDate: overrides.dtstartDate !== undefined ? overrides.dtstartDate : null,
    allDay: overrides.allDay ?? false,
    isShared: overrides.isShared ?? true,
    reminderLeadMinutes:
      overrides.reminderLeadMinutes !== undefined ? overrides.reminderLeadMinutes : 15,
    subId: overrides.subId ?? 1,
    subUserId: overrides.subUserId ?? 1,
    subEndpoint: overrides.subEndpoint ?? 'https://push.example.com/1',
    subP256dh: overrides.subP256dh ?? 'p256dh-key',
    subAuth: overrides.subAuth ?? 'auth-secret',
  };
}

// ── Filtering tests (NOTIF-04/05: variable lead, NULL-vs-0, personal calendar) ────────

describe('reminderScheduler — variable-lead, NULL-vs-0, personal calendar (NOTIF-04/05)', () => {
  beforeEach(() => {
    vi.useFakeTimers();
    vi.resetModules();
  });

  afterEach(() => {
    vi.useRealTimers();
    vi.clearAllMocks();
  });

  it('NOTIF-04: dispatches a timed event when now is inside the lead-driven fire window (30-min lead)', async () => {
    // Fire time = dtstartUtc - 30min. now = dtstartUtc - 30min (exactly at fire time).
    // The event MUST dispatch. It would NOT dispatch under the old fixed 16-min window.
    const now = new Date('2026-06-15T10:00:00Z');
    vi.setSystemTime(now);

    const { db } = await import('../../src/db/client.js');
    const { dispatchPush } = await import('../../src/lib/pushDispatcher.js');
    const { runReminderCheck } = await import('../../src/broker/reminderScheduler.js');

    const dtstartUtc = new Date('2026-06-15T10:30:00Z'); // 30 min from now
    const row = makeEventRow({
      uid: 'notif04-30min-uid',
      dtstartUtc,
      reminderLeadMinutes: 30,
      isShared: true,
    });

    mockTwoQueries(vi.mocked(db), [row]);
    await runReminderCheck(now);

    expect(vi.mocked(dispatchPush)).toHaveBeenCalledOnce();
  });

  it('NOTIF-04: does NOT dispatch a 30-min lead event when now is 5 min before start (fire time already passed)', async () => {
    // Fire time = dtstartUtc - 30min = 09:30. now = 10:25 (event in 5 min, past fire time).
    // SQL should not return this row (fire time check). Simulate with empty mock.
    const now = new Date('2026-06-15T10:25:00Z');
    vi.setSystemTime(now);

    const { db } = await import('../../src/db/client.js');
    const { dispatchPush } = await import('../../src/lib/pushDispatcher.js');
    const { runReminderCheck } = await import('../../src/broker/reminderScheduler.js');

    // Simulate: event would have been in old 16-min window but already past its fire time
    mockTwoQueries(vi.mocked(db), []);
    await runReminderCheck(now);

    expect(vi.mocked(dispatchPush)).not.toHaveBeenCalled();
  });

  it('NOTIF-05: a personal (isShared=false) timed event with non-null lead DOES dispatch (restriction dropped)', async () => {
    const now = new Date('2026-06-15T10:00:00Z');
    vi.setSystemTime(now);

    const { db } = await import('../../src/db/client.js');
    const { dispatchPush } = await import('../../src/lib/pushDispatcher.js');
    const { runReminderCheck } = await import('../../src/broker/reminderScheduler.js');

    const dtstartUtc = new Date('2026-06-15T10:15:00Z');
    const row = makeEventRow({
      uid: 'personal-event-uid',
      dtstartUtc,
      reminderLeadMinutes: 15,
      isShared: false, // personal calendar — must still dispatch
    });

    mockTwoQueries(vi.mocked(db), [row]);
    await runReminderCheck(now);

    // Personal event must dispatch (isShared restriction dropped per NOTIF-05)
    expect(vi.mocked(dispatchPush)).toHaveBeenCalledOnce();
  });

  it('NOTIF-05: an event with reminderLeadMinutes=NULL produces zero dispatches', async () => {
    const now = new Date('2026-06-15T10:00:00Z');
    vi.setSystemTime(now);

    const { db } = await import('../../src/db/client.js');
    const { dispatchPush } = await import('../../src/lib/pushDispatcher.js');
    const { runReminderCheck } = await import('../../src/broker/reminderScheduler.js');

    // NULL lead events are excluded by SQL WHERE (reminder_lead_minutes IS NOT NULL)
    mockTwoQueries(vi.mocked(db), []);
    await runReminderCheck(now);

    expect(vi.mocked(dispatchPush)).not.toHaveBeenCalled();
  });

  it('NOTIF-05: a timed event with reminderLeadMinutes=0 produces zero dispatches (D-06: 0 on timed = None)', async () => {
    const now = new Date('2026-06-15T10:00:00Z');
    vi.setSystemTime(now);

    const { db } = await import('../../src/db/client.js');
    const { dispatchPush } = await import('../../src/lib/pushDispatcher.js');
    const { runReminderCheck } = await import('../../src/broker/reminderScheduler.js');

    const dtstartUtc = new Date('2026-06-15T10:01:00Z');
    const row = makeEventRow({
      uid: 'timed-zero-uid',
      dtstartUtc,
      reminderLeadMinutes: 0, // D-06: 0 on timed = None (skip)
      allDay: false,
    });

    // Even if the query returned a timed-0 event, JS must skip it
    mockTwoQueries(vi.mocked(db), [row]);
    await runReminderCheck(now);

    expect(vi.mocked(dispatchPush)).not.toHaveBeenCalled();
  });

  it('does not dispatch for an event whose start has already passed (dtstart <= now)', async () => {
    const now = new Date('2026-06-15T10:00:00Z');
    vi.setSystemTime(now);

    const { db } = await import('../../src/db/client.js');
    const { dispatchPush } = await import('../../src/lib/pushDispatcher.js');
    const { runReminderCheck } = await import('../../src/broker/reminderScheduler.js');

    // gt(dtstartUtc, now) excludes already-started events; simulate by returning empty rows
    mockTwoQueries(vi.mocked(db), []);

    await runReminderCheck(now);

    expect(vi.mocked(dispatchPush)).not.toHaveBeenCalled();
  });
});

// ── D-16: empty subscriptions — zero sends / no crash ────────────────────────

describe('reminderScheduler — D-16: empty push_subscriptions', () => {
  beforeEach(() => {
    vi.useFakeTimers();
    vi.resetModules();
  });

  afterEach(() => {
    vi.useRealTimers();
    vi.clearAllMocks();
  });

  it('produces zero sends and does not crash when push_subscriptions is empty (D-16)', async () => {
    const now = new Date('2026-06-15T10:00:00Z');
    vi.setSystemTime(now);

    const { db } = await import('../../src/db/client.js');
    const { dispatchPush } = await import('../../src/lib/pushDispatcher.js');
    const { runReminderCheck } = await import('../../src/broker/reminderScheduler.js');

    // Cross-join with empty push_subscriptions returns no rows for both queries
    mockTwoQueries(vi.mocked(db), []);

    await expect(runReminderCheck(now)).resolves.toBeUndefined();
    expect(vi.mocked(dispatchPush)).not.toHaveBeenCalled();
  });
});

// ── Catch-up / missed-tick recovery ──────────────────────────────────────────

describe('reminderScheduler — catch-up window and missed-tick recovery', () => {
  beforeEach(() => {
    vi.useFakeTimers();
    vi.resetModules();
  });

  afterEach(() => {
    vi.useRealTimers();
    vi.clearAllMocks();
  });

  it('SINGLE-FIRE (uid:dtstartMs): dispatches exactly once across three consecutive ticks while event is in window', async () => {
    // NOTIF-06: dedup key is uid:dtstartMs — same compound key fires once across 3 ticks
    const { db } = await import('../../src/db/client.js');
    const { dispatchPush } = await import('../../src/lib/pushDispatcher.js');
    const { runReminderCheck } = await import('../../src/broker/reminderScheduler.js');

    const t0 = new Date('2026-06-15T10:00:00Z');
    // Event is 15 min out from t0. Fire window (now-60s, now] catches it at t0.
    const eventDtstart = new Date('2026-06-15T10:15:00Z');

    const sub = {
      id: 1,
      userId: 1,
      endpoint: 'https://push.example.com/1',
      p256dh: 'k',
      auth: 'a',
    };

    function rowForNow() {
      return makeEventRow({
        uid: 'single-fire-uid',
        dtstartUtc: eventDtstart,
        reminderLeadMinutes: 15,
        subId: sub.id,
        subUserId: sub.userId,
        subEndpoint: sub.endpoint,
        subP256dh: sub.p256dh,
        subAuth: sub.auth,
      });
    }

    // Tick at t0 — fire time is exactly now (dtstartUtc - 15min = t0); dispatches once
    vi.setSystemTime(t0);
    mockTwoQueries(vi.mocked(db), [rowForNow()]);
    await runReminderCheck(t0);

    // Tick at t0+1min — same uid:dtstartMs already in sentReminders; must NOT re-dispatch
    const t1 = new Date(t0.getTime() + 60 * 1000);
    vi.setSystemTime(t1);
    mockTwoQueries(vi.mocked(db), [rowForNow()]);
    await runReminderCheck(t1);

    // Tick at t0+2min — still deduped
    const t2 = new Date(t0.getTime() + 2 * 60 * 1000);
    vi.setSystemTime(t2);
    mockTwoQueries(vi.mocked(db), [rowForNow()]);
    await runReminderCheck(t2);

    // Exactly one dispatch total: uid:dtstartMs dedup prevents re-fire on ticks 2 and 3
    expect(vi.mocked(dispatchPush).mock.calls.length).toBe(1);
  });

  it('RESCHEDULE (uid:dtstartMs): a rescheduled event (same uid, new dtstart) fires again', async () => {
    // NOTIF-06: compound key uid:dtstartMs — new dtstartMs means new key → re-fires
    const { db } = await import('../../src/db/client.js');
    const { dispatchPush } = await import('../../src/lib/pushDispatcher.js');
    const { runReminderCheck } = await import('../../src/broker/reminderScheduler.js');

    const now = new Date('2026-06-15T10:00:00Z');
    vi.setSystemTime(now);

    const originalDtstart = new Date('2026-06-15T10:15:00Z');

    const row = makeEventRow({
      uid: 'reschedule-uid',
      dtstartUtc: originalDtstart,
      reminderLeadMinutes: 15,
    });

    // First tick — fires
    mockTwoQueries(vi.mocked(db), [row]);
    await runReminderCheck(now);
    expect(vi.mocked(dispatchPush).mock.calls.length).toBe(1);

    // Advance time so original dtstart is pruned; event rescheduled to a new dtstart
    const futureNow = new Date('2026-06-15T10:20:00Z'); // past original dtstart
    vi.setSystemTime(futureNow);
    mockTwoQueries(vi.mocked(db), []); // empty (original started)
    await runReminderCheck(futureNow); // prune old entry

    // Now event has new dtstart (same uid, different dtstartMs) — must fire again
    const rescheduledNow = new Date('2026-06-15T11:00:00Z');
    const rescheduledDtstart = new Date('2026-06-15T11:15:00Z');
    vi.setSystemTime(rescheduledNow);
    const rescheduledRow = makeEventRow({
      uid: 'reschedule-uid',
      dtstartUtc: rescheduledDtstart,
      reminderLeadMinutes: 15,
    });
    mockTwoQueries(vi.mocked(db), [rescheduledRow]);
    await runReminderCheck(rescheduledNow);

    // Must fire again — new compound key uid:rescheduledDtstartMs
    expect(vi.mocked(dispatchPush).mock.calls.length).toBe(2);
  });

  it('MISSED-TICK-RECOVERY: fires when scan runs inside the 60s catch-up window after ideal tick was skipped', async () => {
    const { db } = await import('../../src/db/client.js');
    const { dispatchPush } = await import('../../src/lib/pushDispatcher.js');
    const { runReminderCheck } = await import('../../src/broker/reminderScheduler.js');

    // Event at 10:15:00Z, 15-min lead → fire time 10:00:00Z.
    // Ideal scan at 10:00Z was missed. Call at 10:00:45Z — still in (fire-60s, fire] window.
    const eventDtstart = new Date('2026-06-15T10:15:00Z');
    const recoveryNow = new Date('2026-06-15T10:00:45Z'); // 45s after ideal fire time

    vi.setSystemTime(recoveryNow);

    const row = makeEventRow({
      uid: 'missed-tick-uid',
      dtstartUtc: eventDtstart,
      reminderLeadMinutes: 15,
      subId: 1,
      subUserId: 1,
      subEndpoint: 'https://push.example.com/missed',
      subP256dh: 'k',
      subAuth: 'a',
    });

    mockTwoQueries(vi.mocked(db), [row]);
    await runReminderCheck(recoveryNow);

    // Reminder must fire even though the ideal-mark tick was skipped
    expect(vi.mocked(dispatchPush).mock.calls.length).toBeGreaterThanOrEqual(1);
  });

  it('dispatches to all subscribers for a single event (fan-out)', async () => {
    const now = new Date('2026-06-15T10:00:00Z');
    vi.setSystemTime(now);

    const { db } = await import('../../src/db/client.js');
    const { dispatchPush } = await import('../../src/lib/pushDispatcher.js');
    const { runReminderCheck } = await import('../../src/broker/reminderScheduler.js');

    const dtstartUtc = new Date('2026-06-15T10:15:00Z');

    const rows = [
      makeEventRow({
        uid: 'fanout-uid',
        dtstartUtc,
        reminderLeadMinutes: 15,
        subId: 1,
        subUserId: 1,
        subEndpoint: 'https://push.example.com/1',
        subP256dh: 'k1',
        subAuth: 'a1',
      }),
      makeEventRow({
        uid: 'fanout-uid',
        dtstartUtc,
        reminderLeadMinutes: 15,
        subId: 2,
        subUserId: 2,
        subEndpoint: 'https://push.example.com/2',
        subP256dh: 'k2',
        subAuth: 'a2',
      }),
    ];

    mockTwoQueries(vi.mocked(db), rows);
    await runReminderCheck(now);

    // One dispatch per subscriber
    expect(vi.mocked(dispatchPush).mock.calls.length).toBe(2);
  });
});

// ── WR-01: mark-sent after dispatch ──────────────────────────────────────────

describe('reminderScheduler — WR-01: mark-sent after dispatch', () => {
  beforeEach(() => {
    vi.useFakeTimers();
    vi.resetModules();
  });

  afterEach(() => {
    vi.useRealTimers();
    vi.clearAllMocks();
  });

  it('does not re-dispatch the same uid after a successful dispatch in the same module instance', async () => {
    // WR-01: sentReminders.set(uid) is called AFTER the fan-out loop completes.
    // After a successful dispatch the uid is recorded; a second run with the same
    // module instance must not re-fire for the same uid.
    const { db } = await import('../../src/db/client.js');
    const { dispatchPush } = await import('../../src/lib/pushDispatcher.js');
    const { runReminderCheck } = await import('../../src/broker/reminderScheduler.js');

    const now = new Date('2026-06-15T10:00:00Z');
    vi.setSystemTime(now);

    const sub = {
      id: 1,
      userId: 1,
      endpoint: 'https://push.example.com/1',
      p256dh: 'k',
      auth: 'a',
    };
    const eventRow = makeEventRow({
      uid: 'wr01-dedup-uid',
      title: 'WR-01 dedup event',
      dtstartUtc: new Date('2026-06-15T10:15:00Z'),
      reminderLeadMinutes: 15,
      subId: sub.id,
      subUserId: sub.userId,
      subEndpoint: sub.endpoint,
      subP256dh: sub.p256dh,
      subAuth: sub.auth,
    });

    vi.mocked(dispatchPush).mockResolvedValue(undefined);

    // First run — dispatch succeeds; uid:dtstartMs is recorded after the loop
    mockTwoQueries(vi.mocked(db), [eventRow]);
    await runReminderCheck(now);
    expect(vi.mocked(dispatchPush).mock.calls.length).toBe(1); // dispatched once

    // Second run with same now — uid:dtstartMs is in sentReminders; should NOT re-dispatch
    mockTwoQueries(vi.mocked(db), [eventRow]);
    await runReminderCheck(now);
    expect(vi.mocked(dispatchPush).mock.calls.length).toBe(1); // still 1 — deduped
  });
});

// ── CR-01: started-event pruning ─────────────────────────────────────────────

describe('reminderScheduler — CR-01: sentReminders Map pruning', () => {
  beforeEach(() => {
    vi.useFakeTimers();
    vi.resetModules();
  });

  afterEach(() => {
    vi.useRealTimers();
    vi.clearAllMocks();
  });

  it('prunes started-event entries so a different future event with the same uid can fire again', async () => {
    const { db } = await import('../../src/db/client.js');
    const { dispatchPush } = await import('../../src/lib/pushDispatcher.js');
    const { runReminderCheck } = await import('../../src/broker/reminderScheduler.js');

    const sub = {
      id: 1,
      userId: 1,
      endpoint: 'https://push.example.com/1',
      p256dh: 'k',
      auth: 'a',
    };
    const eventDtstart = new Date('2026-06-15T10:15:00Z');
    const uid = 'prune-test-uid';

    const eventRow = makeEventRow({
      uid,
      title: 'Prune test event',
      dtstartUtc: eventDtstart,
      reminderLeadMinutes: 15,
      subId: sub.id,
      subUserId: sub.userId,
      subEndpoint: sub.endpoint,
      subP256dh: sub.p256dh,
      subAuth: sub.auth,
    });

    // Tick at t0 (now=10:00): event 15 min out — fires
    const t0 = new Date('2026-06-15T10:00:00Z');
    vi.setSystemTime(t0);
    mockTwoQueries(vi.mocked(db), [eventRow]);
    await runReminderCheck(t0);
    expect(vi.mocked(dispatchPush).mock.calls.length).toBe(1); // fired

    // Same t0 — uid:dtstartMs still in Map — must NOT re-fire
    mockTwoQueries(vi.mocked(db), [eventRow]);
    await runReminderCheck(t0);
    expect(vi.mocked(dispatchPush).mock.calls.length).toBe(1); // still 1

    // Advance past dtstart (now=10:20): event has started; CR-01 prunes the uid:dtstartMs entry.
    // The SQL WHERE gt(dtstartUtc, now) would return no rows, so simulate empty.
    const tPast = new Date('2026-06-15T10:20:00Z');
    vi.setSystemTime(tPast);
    mockTwoQueries(vi.mocked(db), []);
    await runReminderCheck(tPast);
    // Pruning fires; dispatch count stays at 1
    expect(vi.mocked(dispatchPush).mock.calls.length).toBe(1);
  });
});

// ── D-09: humanizeLeadMinutes body formatter ─────────────────────────────────

describe('humanizeLeadMinutes — D-09 humanized push body formatter', () => {
  it('maps 30 min → "Starts in 30 min"', async () => {
    const { humanizeLeadMinutes } = await import('../../src/broker/reminderScheduler.js');
    expect(humanizeLeadMinutes(30)).toBe('Starts in 30 min');
  });

  it('maps 59 min → "Starts in 59 min" (< 60 bucket)', async () => {
    const { humanizeLeadMinutes } = await import('../../src/broker/reminderScheduler.js');
    expect(humanizeLeadMinutes(59)).toBe('Starts in 59 min');
  });

  it('maps 60 min → "Starts in 1 hour"', async () => {
    const { humanizeLeadMinutes } = await import('../../src/broker/reminderScheduler.js');
    expect(humanizeLeadMinutes(60)).toBe('Starts in 1 hour');
  });

  it('maps 90 min → "Starts in 1 hour" (60–119 bucket, not 2 hours)', async () => {
    // Math.round(90/60)=2 would give "2 hours" — branch ordering must prevent this
    const { humanizeLeadMinutes } = await import('../../src/broker/reminderScheduler.js');
    expect(humanizeLeadMinutes(90)).toBe('Starts in 1 hour');
  });

  it('maps 120 min → "Starts in 2 hours"', async () => {
    const { humanizeLeadMinutes } = await import('../../src/broker/reminderScheduler.js');
    expect(humanizeLeadMinutes(120)).toBe('Starts in 2 hours');
  });

  it('maps 1440 min → "Starts in 1 day"', async () => {
    const { humanizeLeadMinutes } = await import('../../src/broker/reminderScheduler.js');
    expect(humanizeLeadMinutes(1440)).toBe('Starts in 1 day');
  });

  it('maps 2880 min → "Starts in 2 days"', async () => {
    const { humanizeLeadMinutes } = await import('../../src/broker/reminderScheduler.js');
    expect(humanizeLeadMinutes(2880)).toBe('Starts in 2 days');
  });

  it('maps 10080 min → "Starts in 7 days"', async () => {
    const { humanizeLeadMinutes } = await import('../../src/broker/reminderScheduler.js');
    expect(humanizeLeadMinutes(10080)).toBe('Starts in 7 days');
  });
});

describe('reminderScheduler — D-09: humanized push body in dispatch', () => {
  beforeEach(() => {
    vi.useFakeTimers();
    vi.resetModules();
  });

  afterEach(() => {
    vi.useRealTimers();
    vi.clearAllMocks();
  });

  it('dispatched notification body is humanized from configured lead (not live minutes-to-start)', async () => {
    // D-09: body driven by event.reminderLeadMinutes (DB ground truth), not by (dtstart - now)
    // A 1440-min (1 day) lead event should produce "Starts in 1 day", not "Starts in 30 min"
    const now = new Date('2026-06-15T10:00:00Z');
    vi.setSystemTime(now);

    const { db } = await import('../../src/db/client.js');
    const { dispatchPush } = await import('../../src/lib/pushDispatcher.js');
    const { runReminderCheck } = await import('../../src/broker/reminderScheduler.js');

    // Event exactly 1440 min (1 day) from now → fire time = dtstartUtc - 1440min = now
    const dtstartUtc = new Date('2026-06-16T10:00:00Z'); // tomorrow 10:00Z
    const row = makeEventRow({
      uid: 'humanize-body-uid',
      title: 'Meeting Tomorrow',
      dtstartUtc,
      reminderLeadMinutes: 1440,
    });

    mockTwoQueries(vi.mocked(db), [row]);
    await runReminderCheck(now);

    expect(vi.mocked(dispatchPush)).toHaveBeenCalledOnce();
    const [, payload] = vi.mocked(dispatchPush).mock.calls[0]!;
    // Body must be "Starts in 1 day" (configured lead), not "Starts in 1470 min" (live delta)
    expect((payload as { body: string }).body).toBe('Starts in 1 day');
  });
});

// ── NOTIF-06: All-day 9 AM-local fire branch ─────────────────────────────────

describe('reminderScheduler — NOTIF-06: all-day 9 AM-local fire branch', () => {
  // All-day tests use the server timezone (America/New_York = UTC-4 in summer).
  // computeAlertInstantUtc('2026-06-15', 0, 'America/New_York') = 2026-06-15T13:00:00Z.
  // Tests set `now` to the expected alert UTC to trigger the fire window.
  // Pin TZ explicitly so these assertions are deterministic regardless of the host/CI
  // timezone (CI runs UTC; the scheduler reads process.env.TZ at call time, D-04).
  let prevTz: string | undefined;

  beforeEach(() => {
    prevTz = process.env.TZ;
    process.env.TZ = 'America/New_York';
    vi.useFakeTimers();
    vi.resetModules();
  });

  afterEach(() => {
    vi.useRealTimers();
    vi.clearAllMocks();
    if (prevTz === undefined) delete process.env.TZ;
    else process.env.TZ = prevTz;
  });

  it('all-day 0-lead fires at 9 AM local (not midnight) on event date', async () => {
    // 2026-06-15 all-day, 0-lead → alert = computeAlertInstantUtc('2026-06-15', 0, tz)
    // America/New_York summer (EDT, UTC-4) → 9 AM EDT = 2026-06-15T13:00:00Z
    const alertUtc = new Date('2026-06-15T13:00:00Z');
    vi.setSystemTime(alertUtc); // now = alert time → fire window triggers

    const { db } = await import('../../src/db/client.js');
    const { dispatchPush } = await import('../../src/lib/pushDispatcher.js');
    const { runReminderCheck } = await import('../../src/broker/reminderScheduler.js');

    const allDayRow = makeEventRow({
      uid: 'allday-0lead-uid',
      title: 'All-Day Event',
      dtstartDate: '2026-06-15',
      dtstartUtc: null,
      allDay: true,
      reminderLeadMinutes: 0,
    });

    // Second query (all-day) returns this row; timed query empty
    mockTwoQueries(vi.mocked(db), [], [allDayRow]);
    await runReminderCheck(alertUtc);

    // Must dispatch at 13:00 UTC (9 AM EDT) — NOT at midnight
    expect(vi.mocked(dispatchPush)).toHaveBeenCalledOnce();
  });

  it('all-day 0-lead does NOT fire at midnight (2026-06-15T00:00:00Z)', async () => {
    // Midnight UTC is NOT 9 AM local → must not dispatch
    const midnight = new Date('2026-06-15T00:00:00Z');
    vi.setSystemTime(midnight);

    const { db } = await import('../../src/db/client.js');
    const { dispatchPush } = await import('../../src/lib/pushDispatcher.js');
    const { runReminderCheck } = await import('../../src/broker/reminderScheduler.js');

    const allDayRow = makeEventRow({
      uid: 'allday-midnight-uid',
      dtstartDate: '2026-06-15',
      dtstartUtc: null,
      allDay: true,
      reminderLeadMinutes: 0,
    });

    mockTwoQueries(vi.mocked(db), [], [allDayRow]);
    await runReminderCheck(midnight);

    // Alert time is 13:00 UTC, not midnight → no dispatch
    expect(vi.mocked(dispatchPush)).not.toHaveBeenCalled();
  });

  it('all-day 1440-lead fires at 9 AM local the day before (2026-06-14T13:00:00Z)', async () => {
    // 2026-06-15 all-day, 1440-lead → alert day = 2026-06-14
    // 9 AM EDT on 2026-06-14 = 2026-06-14T13:00:00Z
    const alertUtc = new Date('2026-06-14T13:00:00Z');
    vi.setSystemTime(alertUtc);

    const { db } = await import('../../src/db/client.js');
    const { dispatchPush } = await import('../../src/lib/pushDispatcher.js');
    const { runReminderCheck } = await import('../../src/broker/reminderScheduler.js');

    const allDayRow = makeEventRow({
      uid: 'allday-1440lead-uid',
      dtstartDate: '2026-06-15',
      dtstartUtc: null,
      allDay: true,
      reminderLeadMinutes: 1440,
    });

    mockTwoQueries(vi.mocked(db), [], [allDayRow]);
    await runReminderCheck(alertUtc);

    expect(vi.mocked(dispatchPush)).toHaveBeenCalledOnce();
  });

  it('all-day 10080-lead fires at 9 AM local 7 days before the event', async () => {
    // 2026-06-22 all-day, 10080-lead (7 days) → alert day = 2026-06-15
    // 9 AM EDT on 2026-06-15 = 2026-06-15T13:00:00Z
    const alertUtc = new Date('2026-06-15T13:00:00Z');
    vi.setSystemTime(alertUtc);

    const { db } = await import('../../src/db/client.js');
    const { dispatchPush } = await import('../../src/lib/pushDispatcher.js');
    const { runReminderCheck } = await import('../../src/broker/reminderScheduler.js');

    const allDayRow = makeEventRow({
      uid: 'allday-10080lead-uid',
      dtstartDate: '2026-06-22',
      dtstartUtc: null,
      allDay: true,
      reminderLeadMinutes: 10080,
    });

    mockTwoQueries(vi.mocked(db), [], [allDayRow]);
    await runReminderCheck(alertUtc);

    expect(vi.mocked(dispatchPush)).toHaveBeenCalledOnce();
  });

  it('all-day dedup: same uid:dtstartMs fires exactly once across consecutive ticks', async () => {
    // NOTIF-06: uid:dtstartDate-midnight-ms dedup for all-day events
    const alertUtc = new Date('2026-06-15T13:00:00Z'); // fire time for '2026-06-15', 0-lead, EDT

    const { db } = await import('../../src/db/client.js');
    const { dispatchPush } = await import('../../src/lib/pushDispatcher.js');
    const { runReminderCheck } = await import('../../src/broker/reminderScheduler.js');

    const allDayRow = makeEventRow({
      uid: 'allday-dedup-uid',
      dtstartDate: '2026-06-15',
      dtstartUtc: null,
      allDay: true,
      reminderLeadMinutes: 0,
    });

    // Tick 1: at alert time — fires
    vi.setSystemTime(alertUtc);
    mockTwoQueries(vi.mocked(db), [], [allDayRow]);
    await runReminderCheck(alertUtc);
    expect(vi.mocked(dispatchPush).mock.calls.length).toBe(1);

    // Tick 2: 30s later — same uid:dtstartMs in sentReminders → no re-dispatch
    const tick2 = new Date(alertUtc.getTime() + 30 * 1000);
    vi.setSystemTime(tick2);
    mockTwoQueries(vi.mocked(db), [], [allDayRow]);
    await runReminderCheck(tick2);
    expect(vi.mocked(dispatchPush).mock.calls.length).toBe(1); // still 1
  });
});

// ── T-05-19: per-subscription error isolation ────────────────────────────────

describe('reminderScheduler — T-05-19: per-subscription error isolation', () => {
  beforeEach(() => {
    vi.useFakeTimers();
    vi.resetModules();
  });

  afterEach(() => {
    vi.useRealTimers();
    vi.clearAllMocks();
  });

  it('continues dispatching to remaining subscribers when one subscription throws', async () => {
    const now = new Date('2026-06-15T10:00:00Z');
    vi.setSystemTime(now);

    const { db } = await import('../../src/db/client.js');
    const { dispatchPush } = await import('../../src/lib/pushDispatcher.js');
    const { runReminderCheck } = await import('../../src/broker/reminderScheduler.js');

    const dtstartUtc = new Date('2026-06-15T10:15:00Z');
    const rows = [
      makeEventRow({
        uid: 'iso-uid',
        dtstartUtc,
        reminderLeadMinutes: 15,
        subId: 1,
        subUserId: 1,
        subEndpoint: 'https://push.example.com/1',
        subP256dh: 'k1',
        subAuth: 'a1',
      }),
      makeEventRow({
        uid: 'iso-uid',
        dtstartUtc,
        reminderLeadMinutes: 15,
        subId: 2,
        subUserId: 2,
        subEndpoint: 'https://push.example.com/2',
        subP256dh: 'k2',
        subAuth: 'a2',
      }),
    ];

    mockTwoQueries(vi.mocked(db), rows);
    // First subscriber throws; second should still be attempted
    vi.mocked(dispatchPush)
      .mockRejectedValueOnce(new Error('network error'))
      .mockResolvedValueOnce(undefined);

    await expect(runReminderCheck(now)).resolves.toBeUndefined();
    expect(vi.mocked(dispatchPush).mock.calls.length).toBe(2); // both attempted
  });
});

// ── CR-02: all-day-aware push body (Phase 11 Plan 05) ────────────────────────

describe('humanizeLeadMinutes — CR-02 all-day-aware push body', () => {
  // CR-02: humanizeLeadMinutes(0) produces "Starts in 0 min" for timed events,
  // but for all-day same-day events (lead=0) the correct body is "Today".
  // The function must accept an isAllDay flag to return sensible all-day wording.
  // These tests MUST FAIL before the fix — humanizeLeadMinutes takes only one arg.

  it('CR-02: all-day same-day (lead=0) body is NOT "Starts in 0 min" (isAllDay=true)', async () => {
    const { humanizeLeadMinutes } = await import('../../src/broker/reminderScheduler.js');
    // Before fix: humanizeLeadMinutes(0) → 'Starts in 0 min' (wrong for all-day same-day)
    // After fix:  humanizeLeadMinutes(0, true) → 'Today'
    expect(humanizeLeadMinutes(0, true)).not.toBe('Starts in 0 min');
  });

  it('CR-02: all-day same-day (lead=0, isAllDay=true) body is "Today"', async () => {
    const { humanizeLeadMinutes } = await import('../../src/broker/reminderScheduler.js');
    expect(humanizeLeadMinutes(0, true)).toBe('Today');
  });

  it('CR-02: all-day 1-day lead (1440 min, isAllDay=true) body is "Tomorrow"', async () => {
    const { humanizeLeadMinutes } = await import('../../src/broker/reminderScheduler.js');
    expect(humanizeLeadMinutes(1440, true)).toBe('Tomorrow');
  });

  it('CR-02: all-day 2-day lead (2880 min, isAllDay=true) body is "In 2 days"', async () => {
    const { humanizeLeadMinutes } = await import('../../src/broker/reminderScheduler.js');
    expect(humanizeLeadMinutes(2880, true)).toBe('In 2 days');
  });

  it('CR-02: all-day 1-week lead (10080 min, isAllDay=true) body is "In 1 week"', async () => {
    const { humanizeLeadMinutes } = await import('../../src/broker/reminderScheduler.js');
    expect(humanizeLeadMinutes(10080, true)).toBe('In 1 week');
  });

  it('CR-02: timed event body unchanged — humanizeLeadMinutes(0, false) is "Starts in 0 min"', async () => {
    const { humanizeLeadMinutes } = await import('../../src/broker/reminderScheduler.js');
    // Timed event 0-lead: treated as None by the scheduler, but the formatter
    // should still return the existing "Starts in 0 min" for completeness
    expect(humanizeLeadMinutes(0, false)).toBe('Starts in 0 min');
  });

  it('CR-02: timed event body unchanged — humanizeLeadMinutes(30) still "Starts in 30 min"', async () => {
    const { humanizeLeadMinutes } = await import('../../src/broker/reminderScheduler.js');
    // Default isAllDay=false: existing timed behavior must be unchanged
    expect(humanizeLeadMinutes(30)).toBe('Starts in 30 min');
  });
});

// ── Plan 18-03: stored household_timezone drives all-day 9 AM-local fire ─────
//
// D-05: when getHouseholdTimezone(db) returns a stored IANA zone, the scheduler
//        must compute the 9 AM alert using THAT zone (not process.env.TZ).
// D-06: the existing process.env.TZ-pinned tests above still pass unchanged
//        (the fallback fires when no app_config row is returned).
//
// Before the rewire (GREEN), serverTz is still read from process.env.TZ, so the
// stored 'America/Chicago' has no effect → these tests FAIL (RED gate).

/**
 * Mock a db with three sequential select calls:
 *   1st: timed events query  → timedRows
 *   2nd: all-day events query → allDayRows
 *   3rd: getHouseholdTimezone app_config query → [{value: tz}] (or [] for no-row)
 *
 * The 3rd select chain is: select({value}).from(appConfig).where(...).limit(1)
 * which resolves via: from → where → limit → promise.
 */
function makeAppConfigSelectMock(tzRow: { value: string } | null) {
  const rows = tzRow ? [tzRow] : [];
  const limitResolve = vi.fn().mockResolvedValue(rows);
  // .where() must return an object with a .limit() method (not the fn itself)
  const whereFn = vi.fn().mockReturnValue({ limit: limitResolve });
  return {
    from: vi.fn().mockReturnValue({ where: whereFn }),
  } as never;
}

function mockThreeQueries(
  db: { select: ReturnType<typeof vi.fn> },
  timedRows: unknown[],
  allDayRows: unknown[],
  tzRow: { value: string } | null,
) {
  // Reset any unconsumed mockReturnValueOnce entries from a prior test before adding new ones.
  // vi.clearAllMocks() does NOT flush the once-queue; vi.resetModules() may return the same
  // vi.fn() instance across tests (Vitest caches mock factories across module resets).
  db.select.mockReset();
  db.select
    .mockReturnValueOnce(makeSelectMock(timedRows))
    .mockReturnValueOnce(makeSelectMock(allDayRows))
    .mockReturnValueOnce(makeAppConfigSelectMock(tzRow));
}

describe('reminderScheduler — Plan 18-03: stored household_timezone drives all-day alert (D-05)', () => {
  // These tests FAIL before the rewire because serverTz is still read from process.env.TZ.
  // After the rewire, getHouseholdTimezone(db) returns the stored zone → GREEN.
  //
  // Event date: 2026-06-20 (summer).
  // America/New_York: EDT (UTC-4) → 9 AM = 13:00 UTC.
  // America/Chicago: CDT (UTC-5) → 9 AM = 14:00 UTC.
  // process.env.TZ is set to 'America/New_York' for these tests; stored zone is 'America/Chicago'.
  // When the stored zone drives the computation: alert fires at 14:00 UTC.
  let prevTz: string | undefined;

  beforeEach(() => {
    prevTz = process.env.TZ;
    process.env.TZ = 'America/New_York';
    vi.useFakeTimers();
    vi.resetModules();
  });

  afterEach(() => {
    vi.useRealTimers();
    vi.clearAllMocks();
    if (prevTz === undefined) delete process.env.TZ;
    else process.env.TZ = prevTz;
  });

  it('D-05: stored America/Chicago fires at 9 AM Chicago (14:00 UTC), not 13:00 UTC (New York)', async () => {
    // 2026-06-20 all-day, 0-lead, stored zone 'America/Chicago' (CDT, UTC-5)
    // Expected alert: 9 AM CDT = 2026-06-20T14:00:00Z
    const alertUtcChicago = new Date('2026-06-20T14:00:00Z');
    vi.setSystemTime(alertUtcChicago); // now = Chicago alert time

    const { db } = await import('../../src/db/client.js');
    const { dispatchPush } = await import('../../src/lib/pushDispatcher.js');
    const { runReminderCheck } = await import('../../src/broker/reminderScheduler.js');

    const allDayRow = makeEventRow({
      uid: 'stored-tz-chicago-uid',
      title: 'All-Day Stored TZ Event',
      dtstartDate: '2026-06-20',
      dtstartUtc: null,
      allDay: true,
      reminderLeadMinutes: 0,
    });

    // Third select returns the stored 'America/Chicago' row from app_config
    mockThreeQueries(vi.mocked(db), [], [allDayRow], { value: 'America/Chicago' });
    await runReminderCheck(alertUtcChicago);

    // Must dispatch at 14:00 UTC (9 AM CDT) — the stored zone drives the computation
    expect(vi.mocked(dispatchPush)).toHaveBeenCalledOnce();
  });

  it('D-05: stored America/Chicago does NOT fire at 13:00 UTC (that is 9 AM New York)', async () => {
    // now = 13:00 UTC. If stored zone is 'America/Chicago', alert = 14:00 UTC → NOT yet.
    const nyAlertTime = new Date('2026-06-20T13:00:00Z');
    vi.setSystemTime(nyAlertTime);

    const { db } = await import('../../src/db/client.js');
    const { dispatchPush } = await import('../../src/lib/pushDispatcher.js');
    const { runReminderCheck } = await import('../../src/broker/reminderScheduler.js');

    const allDayRow = makeEventRow({
      uid: 'stored-tz-no-early-fire-uid',
      title: 'All-Day No Early Fire',
      dtstartDate: '2026-06-20',
      dtstartUtc: null,
      allDay: true,
      reminderLeadMinutes: 0,
    });

    mockThreeQueries(vi.mocked(db), [], [allDayRow], { value: 'America/Chicago' });
    await runReminderCheck(nyAlertTime);

    // Stored zone is Chicago → alert is 14:00 UTC, not 13:00 UTC → must NOT fire
    expect(vi.mocked(dispatchPush)).not.toHaveBeenCalled();
  });
});