const fs = require('fs');
const path = require('path');
const os = require('os');

let tmpDir;
let dbPath;
let server;
let dbRef;

function createFreshApp() {
  process.env.DB_PATH = dbPath;

  // Drop EVERY app module from the require cache so each test gets a fresh app + DB handle.
  // (A hand-picked list missed routes/*, which kept services bound to a previous, closed DB.)
  const root = path.resolve(__dirname, '..');
  for (const id of Object.keys(require.cache)) {
    if (id.startsWith(path.join(root, 'src') + path.sep) || id.startsWith(path.join(root, 'scripts') + path.sep)) {
      delete require.cache[id];
    }
  }

  const { runMigrations } = require('../scripts/migrate');
  runMigrations();

  // Capture the DB instance before creating the app (session store uses it)
  const dbModule = require('../src/db');
  dbRef = dbModule.getDb();

  const { createApp } = require('../src/app');
  return createApp();
}

async function setup() {
  tmpDir = fs.mkdtempSync(path.join(os.tmpdir(), 'emberfall-test-'));
  dbPath = path.join(tmpDir, 'test.db');

  const app = createFreshApp();

  return new Promise((resolve, reject) => {
    server = app.listen(0, () => {
      const port = server.address().port;
      resolve(`http://localhost:${port}`);
    });
    server.on('error', reject);
  });
}

function teardown() {
  return new Promise((resolve) => {
    if (server) {
      // Close server first to stop accepting connections
      try { server.closeAllConnections(); } catch (_) {}
      server.close(() => {
        server = null;
        // Then close DB to stop session store's cleanup interval
        if (dbRef) {
          try { dbRef.close(); } catch (_) {}
          dbRef = null;
        }
        resolve();
      });
    } else {
      // No server, just close DB
      if (dbRef) {
        try { dbRef.close(); } catch (_) {}
        dbRef = null;
      }
      resolve();
    }
  });
}

function cleanup() {
  if (tmpDir && fs.existsSync(tmpDir)) {
    try { fs.rmSync(tmpDir, { recursive: true }); } catch (_) {}
  }
  tmpDir = undefined;
  dbPath = undefined;
}

module.exports = { setup, teardown, cleanup };