// Investor Flow — confluenceProducer.test.ts
//
// Guards the confluence_change producer contract:
//   - First evaluation establishes a baseline (silent on first ever check
//     only when the picture can't yet be judged — but with two evaluations it
//     fires on the transition).
//   - Watermarks prevent re-firing on repeated checks of the same evaluation.
//   - Only subscribed users are notified.
//   - Description is a picture observation, never a directive.

import { test, describe } from 'node:test';
import { strict as assert } from 'node:assert';
import { DatabaseSync } from 'node:sqlite';
import { readFileSync } from 'node:fs';
import { dirname, join } from 'node:path';
import { fileURLToPath } from 'node:url';

import { confluenceChangeProducer } from '../producers/confluenceProducer.ts';
import { ConfluenceRepository, rackFromSlots } from '../../db/confluenceRepository.ts';
import { evaluateRack, type SlotAssessment } from '../../confluence/confluenceRack.ts';

const __dirname = dirname(fileURLToPath(import.meta.url));
const SCHEMA_SQL = readFileSync(join(__dirname, '..', '..', 'db', 'schema.sql'), 'utf8');

function freshDb(): DatabaseSync {
  const db = new DatabaseSync(':memory:', { enableForeignKeyConstraints: true });
  db.exec(SCHEMA_SQL);
  return db;
}

function addUser(db: DatabaseSync, id: string) {
  db.prepare(
    `INSERT OR IGNORE INTO users (id, email, pw_hash, complexity, drawdown_tolerance, created_at)
     VALUES (?, ?, '', 'beginner', 20, ?)`,
  ).run(id, `${id}@t.local`, new Date().toISOString());
}

function subscribeGlobal(db: DatabaseSync, userId: string, alertType: string) {
  db.prepare(
    `INSERT INTO alerts (id, owner_id, symbol, alert_type, enabled, params, created_at)
     VALUES (?, ?, NULL, ?, 1, '{}', ?)`,
  ).run(`sub-${userId}-${alertType}`, userId, alertType, new Date().toISOString());
}

function alertCount(db: DatabaseSync, type: string): number {
  const r = db.prepare('SELECT COUNT(*) AS n FROM alert_events WHERE type = ?').get(type) as { n: number };
  return r.n;
}

const fired = (id: string): SlotAssessment => ({ id, state: 'fired' });
const notFired = (id: string): SlotAssessment => ({ id, state: 'not-fired' });

function seedRack(db: DatabaseSync): string {
  const repo = new ConfluenceRepository(db);
  repo.saveRack(rackFromSlots('rt', 'Rack T', ['goldenCross', 'relVolume', 'cotPositioning'], { isSystem: true }));
  return 'rt';
}

describe('confluence_change producer', () => {
  test('fires once when the picture deteriorates between two evaluations', async () => {
    const db = freshDb();
    addUser(db, 'u1');
    subscribeGlobal(db, 'u1', 'confluence_change');
    const rackId = seedRack(db);
    const repo = new ConfluenceRepository(db);

    // Baseline: constructive.
    repo.saveEvaluation(evaluateRack('PLTR', '2026-01-05', [
      fired('goldenCross'), fired('relVolume'), notFired('cotPositioning'),
    ]), rackId, 'ev1');
    // Deterioration: death-cross + cautious signals.
    repo.saveEvaluation(evaluateRack('PLTR', '2026-02-02', [
      notFired('goldenCross'), fired('cotPositioning'), { id: 'deathCross', state: 'fired' },
    ]), rackId, 'ev2');

    const alerts = await confluenceChangeProducer.check(db);
    assert.equal(alerts.length, 1);
    assert.equal(alerts[0].symbol, 'PLTR');
    assert.equal(alerts[0].type, 'confluence_change');
    assert.match(alerts[0].description, /PLTR became more cautious/);
    assert.doesNotMatch(alerts[0].description, /\b(buy|sell|long|short)\b/i);
    assert.equal(alertCount(db, 'confluence_change'), 1);

    // Re-run: watermark prevents re-fire.
    const again = await confluenceChangeProducer.check(db);
    assert.equal(again.length, 0);
    assert.equal(alertCount(db, 'confluence_change'), 1);
  });

  test('fires on improvement too', async () => {
    const db = freshDb();
    addUser(db, 'u1');
    subscribeGlobal(db, 'u1', 'confluence_change');
    const rackId = seedRack(db);
    const repo = new ConfluenceRepository(db);

    repo.saveEvaluation(evaluateRack('PLTR', '2026-01-05', [
      { id: 'deathCross', state: 'fired' }, notFired('goldenCross'),
    ]), rackId, 'ev1');
    repo.saveEvaluation(evaluateRack('PLTR', '2026-02-02', [
      fired('goldenCross'), fired('relVolume'), notFired('cotPositioning'),
    ]), rackId, 'ev2');

    const alerts = await confluenceChangeProducer.check(db);
    assert.equal(alerts.length, 1);
    assert.match(alerts[0].description, /PLTR improved/);
  });

  test('does not alert unsubscribed or empty-data installs', async () => {
    const db = freshDb();
    addUser(db, 'u1');
    const rackId = seedRack(db);
    const repo = new ConfluenceRepository(db);
    repo.saveEvaluation(evaluateRack('PLTR', '2026-01-05', [fired('goldenCross')]), rackId, 'ev1');
    repo.saveEvaluation(evaluateRack('PLTR', '2026-02-02', [notFired('goldenCross')]), rackId, 'ev2');

    const alerts = await confluenceChangeProducer.check(db); // no subscription
    assert.equal(alerts.length, 0);
  });

  test('silent when the picture is unchanged', async () => {
    const db = freshDb();
    addUser(db, 'u1');
    subscribeGlobal(db, 'u1', 'confluence_change');
    const rackId = seedRack(db);
    const repo = new ConfluenceRepository(db);

    repo.saveEvaluation(evaluateRack('PLTR', '2026-01-05', [fired('goldenCross'), fired('relVolume')]), rackId, 'ev1');
    repo.saveEvaluation(evaluateRack('PLTR', '2026-02-02', [fired('goldenCross'), fired('relVolume')]), rackId, 'ev2');

    const alerts = await confluenceChangeProducer.check(db);
    assert.equal(alerts.length, 0); // mixed→mixed at same tier, no drift
  });
});