// Integration test for minimal telemetry (Step 13)
// Run with: npm run test:telemetry

import fs from 'node:fs';
import path from 'node:path';
import os from 'node:os';

const tmpDir = fs.mkdtempSync(path.join(os.tmpdir(), 'newtube-telemetry-test-'));
process.env.NEWTUBE_DB_FILE = path.join(tmpDir, 'test.db');

const dbMod = await import('../db.mjs');
const { insertUser, cryptoRandomUUID, insertTelemetryEvent, listTelemetryEvents, countTelemetryEvents } = dbMod;

function expect(cond, msg) {
  if (!cond) throw new Error(`Assertion failed: ${msg}`);
}
function logOk(msg) { console.log(`✓ ${msg}`); }

const user = cryptoRandomUUID();
insertUser({ id: user, username: 'tel-a', email: null, passwordHash: 'x' });

// 1) Insert + read back
const row = insertTelemetryEvent({ userId: user, event: 'search_submit', meta: { providers: ['yt', 'dm'], queryLength: 5 } });
expect(row && row.id, 'insert returns a row with id');
logOk('insertTelemetryEvent returns id');

// 2) List filters by event
const all = listTelemetryEvents({ userId: undefined });
expect(all.length === 1, `one event stored (got ${all.length})`);
const mine = listTelemetryEvents({ event: 'search_submit' });
expect(mine.length === 1, 'list filters by event name');
const none = listTelemetryEvents({ event: 'provider_apply' });
expect(none.length === 0, 'unknown event name yields empty list');
logOk('listTelemetryEvents filters by event');

// 3) Count
expect(countTelemetryEvents({ event: 'search_submit' }) === 1, 'count by event');
expect(countTelemetryEvents({}) === 1, 'count all');
logOk('countTelemetryEvents');

// 4) Meta round-trips as JSON
const meta = JSON.parse(mine[0].metaJson);
expect(Array.isArray(meta.providers) && meta.providers.join(',') === 'yt,dm', 'meta.providers round-trips');
expect(meta.queryLength === 5, 'meta.queryLength round-trips');
logOk('meta JSON round-trip');

// 5) Long event names are truncated, never thrown
const longOk = insertTelemetryEvent({ userId: user, event: 'x'.repeat(500), meta: null });
expect(longOk !== null, 'oversized event name does not throw');
logOk('oversized event name handled');

console.log('\nAll telemetry tests passed.');