#!/usr/bin/env bun
/**
 * Smart api test runner.
 *
 * Almost every api test is an integration test against the Postgres on black,
 * which is only low-latency from the apricot/LAN path. Run from elsewhere (e.g.
 * plum, over the mesh) the per-test DB round-trips blow the timeout and the
 * suite grinds through 60s-timeout failures. This runner probes the test DB and,
 * when it is unreachable or too slow, skips the DB-dependent test files (and
 * tells the harness — via QUINN_SKIP_DB_TESTS — to no-op its DB setup) so the
 * DB-free subset still runs and the suite stays meaningful off-LAN.
 *
 * Decision order:
 *   1. CI or QUINN_REQUIRE_DB_TESTS=1 → always run the FULL suite (fail loud;
 *      CI must never silently skip a broken DB).
 *   2. QUINN_SKIP_DB_TESTS=1          → always skip DB tests.
 *   3. otherwise (auto)              → skip DB tests if the DB is unreachable or
 *      its round-trip exceeds QUINN_DB_LATENCY_SKIP_MS (default 250ms).
 *
 * What gets skipped is always logged — never a silent truncation.
 */
import { readFileSync } from 'node:fs';
import { Glob } from 'bun';
import postgres from 'postgres';

const TIMEOUT = process.env['QUINN_TEST_TIMEOUT'] ?? '60000';
const LATENCY_THRESHOLD_MS = Number(process.env['QUINN_DB_LATENCY_SKIP_MS'] ?? '250');
const DB_URL =
  process.env['QUINN_TEST_DB_URL'] ??
  'postgresql://quinn:devpassword@black.lan:25435/quinn_test';
const ADMIN_URL = DB_URL.replace(/\/[^/]+$/, '/postgres');

const isCi = process.env['CI'] != null || process.env['GITHUB_ACTIONS'] != null || process.env['GITEA_ACTIONS'] != null;
const forceRequire = isCi || process.env['QUINN_REQUIRE_DB_TESTS'] === '1';
const forceSkip = process.env['QUINN_SKIP_DB_TESTS'] === '1';

/** Files referencing the DB harness are integration tests needing the live DB. */
const HARNESS_RE = /test-db|openTestDb|initTestDb|createTestApp|injectDb|activeTestTx|runMigrations/;

function log(line: string): void {
  process.stdout.write(`${line}\n`);
}

async function probeDb(): Promise<{ reachable: boolean; rttMs: number | null }> {
  const sql = postgres(ADMIN_URL, { max: 1, connect_timeout: 4, idle_timeout: 1, onnotice: () => { /* quiet */ } });
  try {
    await sql`SELECT 1`; // connect + warm up
    const t0 = performance.now();
    for (let i = 0; i < 3; i++) await sql`SELECT 1`;
    return { reachable: true, rttMs: Math.round((performance.now() - t0) / 3) };
  } catch {
    return { reachable: false, rttMs: null };
  } finally {
    await sql.end({ timeout: 2 }).catch(() => { /* ignore */ });
  }
}

async function decide(): Promise<{ skipDb: boolean; reason: string }> {
  if (forceRequire) return { skipDb: false, reason: isCi ? 'CI — full suite required' : 'QUINN_REQUIRE_DB_TESTS=1' };
  if (forceSkip) return { skipDb: true, reason: 'QUINN_SKIP_DB_TESTS=1' };
  const { reachable, rttMs } = await probeDb();
  if (!reachable) return { skipDb: true, reason: 'test DB unreachable' };
  if (rttMs != null && rttMs > LATENCY_THRESHOLD_MS) {
    return { skipDb: true, reason: `DB round-trip ${rttMs}ms > ${LATENCY_THRESHOLD_MS}ms (not on the fast LAN path)` };
  }
  return { skipDb: false, reason: `DB round-trip ${rttMs ?? 0}ms` };
}

function isDbDependent(file: string): boolean {
  try {
    return HARNESS_RE.test(readFileSync(file, 'utf8'));
  } catch {
    return false;
  }
}

const { skipDb, reason } = await decide();

const allFiles = [...new Glob('src/**/*.test.ts').scanSync('.')].sort();
const filesToRun = skipDb ? allFiles.filter((f) => !isDbDependent(f)) : allFiles;
const skippedCount = allFiles.length - filesToRun.length;

log(`[run-tests] DB tests ${skipDb ? 'SKIPPED' : 'enabled'} — ${reason}`);
if (skipDb) {
  log(`[run-tests] skipping ${skippedCount} DB-dependent file(s); running ${filesToRun.length} DB-free file(s).`);
  log('[run-tests] run on apricot (fast LAN to black) or set QUINN_REQUIRE_DB_TESTS=1 to include them.');
}

if (filesToRun.length === 0) {
  log('[run-tests] no files to run — nothing to do.');
  process.exit(0);
}

const childEnv: Record<string, string> = { ...(process.env as Record<string, string>) };
// Tell the harness which mode it is in so its module-load DB setup matches the
// file selection above (skip → no-op DB setup; require → force it on).
if (skipDb) childEnv['QUINN_SKIP_DB_TESTS'] = '1';
else childEnv['QUINN_REQUIRE_DB_TESTS'] = '1';

const proc = Bun.spawn(['bun', 'test', '--parallel=1', `--timeout=${TIMEOUT}`, ...filesToRun], {
  env: childEnv,
  stdout: 'inherit',
  stderr: 'inherit',
  stdin: 'inherit',
});
process.exit(await proc.exited);