index.js

import express from 'express';
import Lab5 from './lab5/index.js';
import cors from 'cors';
import db from "./Kambaz/Database/index.js";
import UserRoutes from "./Kambaz/Users/routes.js";
import "dotenv/config";
import session from "express-session";
import CourseRoutes from "./Kambaz/Courses/routes.js";
import ModulesRoutes from "./Kambaz/Modules/routes.js";
import AssignmentsRoutes from "./Kambaz/Assignments/routes.js";
import EnrollmentsRoutes from "./Kambaz/Enrollments/routes.js";

import mongoose from "mongoose";

// Check multiple common environment variable names for MongoDB connection string
const CONNECTION_STRING = 
  process.env.DATABASE_CONNECTION_STRING || 
  process.env.MONGODB_URI || 
  process.env.MONGO_URL || 
  process.env.MONGODB_URL ||
  "mongodb://127.0.0.1:27017/kambaz";

if (!process.env.DATABASE_CONNECTION_STRING && process.env.NODE_ENV === 'production') {
  console.error('DATABASE_CONNECTION_STRING environment variable is required in production');
  process.exit(1);
}

// Configure mongoose connection options
const mongooseOptions = {
  serverSelectionTimeoutMS: 5000, // Timeout after 5s instead of 30s
};

// Connect to MongoDB with better error handling
mongoose.connect(CONNECTION_STRING, mongooseOptions).then(() => {
  console.log('Connected to MongoDB successfully');
}).catch(err => {
  console.error('MongoDB connection error:', err.message);
  console.error('Connection string used:', CONNECTION_STRING.replace(/\/\/[^:]+:[^@]+@/, "//***:***@")); // Hide credentials in logs
  if (err.message.includes('ECONNREFUSED')) {
    console.error('\n⚠️  MongoDB is not running!');
    console.error('Please start MongoDB by running:');
    console.error('  mongod --dbpath ./data');
    console.error('\nOr if MongoDB is installed as a service:');
    console.error('  net start MongoDB (Windows)');
    console.error('  brew services start mongodb-community (macOS)');
    console.error('  sudo systemctl start mongod (Linux)');
  }
  if (process.env.NODE_ENV === 'production') {
    process.exit(1);
  } else {
    console.error('\n⚠️  App will continue but database operations will fail until MongoDB is started.');
    console.error('   Start MongoDB and restart the server to enable database functionality.\n');
  }
});

const app = express();

app.use(cors({
  origin: [
    "https://kambaz-next-js-self.vercel.app", 
    "https://kambaz-next-js-assignment6.vercel.app",
    "http://localhost:3000", 
    "https://kambaz-next-js-2hr8.onrender.com"
  ],  
  credentials: true
}));

app.use(express.json());

const sessionOptions = {
  secret: process.env.SESSION_SECRET || "kambaz",
  resave: false,
  saveUninitialized: false,
  cookie: {}
};

if (process.env.SERVER_ENV !== "development") {
  sessionOptions.proxy = true;
  sessionOptions.cookie = {
    sameSite: "none",
    secure: true,
    // Don't set domain for cross-domain cookies - let the browser handle it
    // The Next.js API proxy will forward cookies correctly
  };
} else {
  sessionOptions.cookie = {
    sameSite: "lax",
    secure: false
  };
}

app.use(session(sessionOptions));

UserRoutes(app, db);
CourseRoutes(app, db);
ModulesRoutes(app, db);
AssignmentsRoutes(app, db);
EnrollmentsRoutes(app, db);

Lab5(app);

app.get('/hello', (req, res) => res.send('Life is good!'));
app.get('/', (req, res) => res.send('Welcome to Full Stack Development!'));

// Debug route to inspect database (development only)
if (process.env.NODE_ENV !== 'production') {
  app.get('/api/debug/db', (req, res) => {
    res.json({
      users: db.users,
      courses: db.courses,
      enrollments: db.enrollments,
      stats: {
        userCount: db.users.length,
        courseCount: db.courses.length,
        enrollmentCount: db.enrollments.length
      }
    });
  });
  
  app.get('/api/debug/users', (req, res) => {
    res.json(db.users);
  });
  
  app.get('/api/debug/courses', (req, res) => {
    res.json(db.courses);
  });
  
  app.get('/api/debug/enrollments', (req, res) => {
    res.json(db.enrollments);
  });
}

app.listen(process.env.PORT || 4000);