const rateLimit = require('express-rate-limit');
const helmet = require('helmet');
const cors = require('cors');
const express = require('express');
const Ddos = require('ddos');
const sslify = require('express-sslify');
const cookieParser = require('cookie-parser');
const slowDown = require('express-slow-down');
const { logger } = require('./logger');
const validator = require('validator');

// Feature Toggle Booleans
const enableDdosProtection = true;
const enableRateLimiting = true;
const enableHelmet = true;
const enableCORS = true;
const enableHttpsRedirect = false;
const enableCookieSecurity = true;
const enableSlowDown = true;

// Initialize DDoS protection with default configuration
let ddos;
if (enableDdosProtection) {
    try {
        ddos = new Ddos({ burst: 10, limit: 15 });
        logger.info({ message: 'DDoS protection initialized with burst: 10, limit: 15' });
    } catch (error) {
        logger.error({ message: 'Failed to initialize DDoS protection', error });
    }
}

// Function to apply security middlewares to the app
const setupSecurity = (app) => {

    app.set('trust proxy', 'loopback');

    // Configure rate limiting
    let limiter;
    if (enableRateLimiting) {
        try {
            limiter = rateLimit({
                windowMs: 5 * 60 * 1000,   // 15 minutes
                max: 300,                   // Limit each IP to 100 requests per windowMs
                standardHeaders: true,      // Return rate limit info in the `RateLimit-*` headers
                legacyHeaders: false,       // Disable the `X-RateLimit-*` headers
            });
            logger.info({ message: 'Rate limiting configured with windowMs: 15 minutes, max: 100 requests per windowMs' });
        } catch (error) {
            logger.error({ message: 'Failed to configure rate limiting', error });
        }
    }
    // Apply HTTPS redirect if enabled
    if (enableHttpsRedirect) {
        try {
            app.use(sslify.HTTPS({ trustProtoHeader: true }));
            logger.info({ message: 'HTTPS redirect middleware applied' });
        } catch (error) {
            logger.error({ message: 'Failed to apply HTTPS redirect middleware', error });
        }
    } else {
        logger.warn({ message: 'HTTPS redirect is disabled for testing purposes' });
    }

    // Apply Helmet to secure HTTP headers
    if (enableHelmet) {
        try {
            app.use(helmet());
            app.use(helmet.contentSecurityPolicy({
                directives: {
                    defaultSrc: ["'self'"],
                    scriptSrc: ["'self'", "'unsafe-inline'", "'unsafe-eval'"],
                    styleSrc: ["'self'", "'unsafe-inline'"],
                    imgSrc: ["'self'", "data:", "https:"],
                    connectSrc: ["'self'"],
                    fontSrc: ["'self'"],
                    objectSrc: ["'none'"],
                    upgradeInsecureRequests: []
                }
            }));
            app.use(helmet.frameguard({ action: 'deny' }));
            app.use(helmet.xssFilter());
            app.use(helmet.hsts({ maxAge: 31536000, includeSubDomains: true, preload: true }));
            logger.info({ message: 'Helmet middleware applied with custom settings' });
        } catch (error) {
            logger.error({ message: 'Failed to apply Helmet middleware', error });
        }
    } else {
        logger.warn({ message: 'Helmet security is disabled for testing purposes' });
    }

    // Apply CORS if enabled
    if (enableCORS) {
        try {
            app.use(cors({
                origin: ['https://ourdomain.co.za'],
                methods: ['GET', 'POST'],
                allowedHeaders: ['Content-Type', 'Authorization']
            }));
            logger.info({ message: 'CORS configured with specific settings' });
        } catch (error) {
            logger.error({ message: 'Failed to apply CORS settings', error });
        }
    } else {
        logger.warn({ message: 'CORS is disabled for testing purposes' });
    }

    // Apply Cookie security if enabled
    if (enableCookieSecurity) {
        try {
            app.use(cookieParser());
            app.use((req, res, next) => {
                res.cookie('name', 'value', { httpOnly: true, secure: process.env.NODE_ENV === 'production', sameSite: 'Strict' });
                next();
            });
            logger.info({ message: 'Cookie security applied' });
        } catch (error) {
            logger.error({ message: 'Failed to apply cookie security', error });
        }
    } else {
        logger.warn({ message: 'Cookie security is disabled for testing purposes' });
    }

    // Apply rate limiting if enabled
    if (enableRateLimiting) {
        try {
            app.use(limiter);
            logger.info({ message: 'Rate limiting middleware applied to all routes' });
        } catch (error) {
            logger.error({ message: 'Failed to apply rate limiting middleware', error });
        }
    } else {
        logger.warn({ message: 'Rate limiting is disabled for testing purposes' });
    }

    // Apply DDoS protection if enabled
    if (enableDdosProtection) {
        try {
            app.use(ddos.express);
            logger.info({ message: 'DDoS protection middleware applied' });
        } catch (error) {
            logger.error({ message: 'Failed to apply DDoS protection middleware', error });
        }
    } else {
        logger.warn({ message: 'DDoS protection is disabled for testing purposes' });
    }

    // Apply slow down protection if enabled
    if (enableSlowDown) {
        try {
            app.use(slowDown({
                windowMs: 15 * 60 * 1000,  // 15 minutes
                delayAfter: 100,           // Delay after 100 requests
                delayMs: () => 500         // Apply a fixed 500ms delay after exceeding the threshold
            }));
            logger.info({ message: 'Slow down protection applied' });
        } catch (error) {
            logger.error({ message: 'Failed to apply slow down protection', error });
        }
    } else {
        logger.warn({ message: 'Slow down protection is disabled for testing purposes' });
    }


};

module.exports = { setupSecurity };