'use strict';

/**
 * Jest integration test setup.
 * Uses an in-memory MongoDB instance (mongodb-memory-server) so tests run
 * without any external database credentials or infrastructure.
 *
 * TOKEN_SECRET may optionally be set in the environment; a safe default
 * is used when it is absent (tests only, never production).
 */

// Ensure NODE_ENV=test so application code skips production-only paths.
process.env.NODE_ENV = 'test';
// Provide a default token secret for JWT signing in tests.
if (!process.env.TOKEN_SECRET) {
  process.env.TOKEN_SECRET = 'test-secret-not-for-production';
}

const { MongoMemoryServer } = require('mongodb-memory-server');
const mongoose = require('mongoose');

let mongod = null;

/**
 * Start the in-memory MongoDB server and connect mongoose.
 * Call this inside beforeAll() in each test file.
 */
async function connectDB() {
  if (mongoose.connection.readyState !== 0) return; // already connected

  mongod = await MongoMemoryServer.create();
  const uri = mongod.getUri();

  mongoose.set('strictPopulate', false);
  await mongoose.connect(uri, {
    connectTimeoutMS: 15000,
    socketTimeoutMS:  30000,
  });

  // Register all discriminators in the correct order (user → sub-types).
  // Require-ordering matters – base model first.
  require('../../model');
}

/**
 * Disconnect mongoose and stop the in-memory server.
 * Call this inside afterAll() in each test file.
 */
async function disconnectDB() {
  await mongoose.disconnect();
  if (mongod) {
    await mongod.stop();
    mongod = null;
  }
}

/**
 * Remove all documents from a collection.
 * Call this inside beforeEach() / afterEach() to keep tests isolated.
 */
async function clearCollection(model) {
  await model.deleteMany({});
}

module.exports = { connectDB, disconnectDB, clearCollection };