events {
    worker_connections 1024;
}

http {
    upstream lmdpro_app {
        server lmdpro:3000;
    }

    # Rate limiting
    limit_req_zone $binary_remote_addr zone=api:10m rate=10r/s;
    limit_req_zone $binary_remote_addr zone=general:10m rate=5r/s;

    # Gzip compression
    gzip on;
    gzip_vary on;
    gzip_min_length 1024;
    gzip_types
        text/plain
        text/css
        text/xml
        text/javascript
        application/javascript
        application/xml+rss
        application/json;

    # Security headers
    add_header X-Frame-Options DENY always;
    add_header X-Content-Type-Options nosniff always;
    add_header X-XSS-Protection "1; mode=block" always;
    add_header Referrer-Policy "strict-origin-when-cross-origin" always;

    # HTTP to HTTPS redirect
    server {
        listen 80;
        server_name lmdpro.com www.lmdpro.com;
        return 301 https://www.lmdpro.com$request_uri;
    }

    # HTTPS server
    server {
        listen 443 ssl http2;
        server_name www.lmdpro.com;

        # SSL configuration
        ssl_certificate /etc/nginx/ssl/fullchain.pem;
        ssl_certificate_key /etc/nginx/ssl/privkey.pem;
        ssl_protocols TLSv1.2 TLSv1.3;
        ssl_ciphers ECDHE-RSA-AES256-GCM-SHA512:DHE-RSA-AES256-GCM-SHA512:ECDHE-RSA-AES256-GCM-SHA384:DHE-RSA-AES256-GCM-SHA384;
        ssl_prefer_server_ciphers off;
        ssl_session_cache shared:SSL:10m;
        ssl_session_timeout 10m;

        # HSTS
        add_header Strict-Transport-Security "max-age=63072000; includeSubDomains; preload" always;

        # Root and index
        root /var/www/html;
        index index.html;

        # Client max body size
        client_max_body_size 10M;

        # API routes with rate limiting
        location /api/ {
            limit_req zone=api burst=20 nodelay;
            proxy_pass http://lmdpro_app;
            proxy_http_version 1.1;
            proxy_set_header Upgrade $http_upgrade;
            proxy_set_header Connection 'upgrade';
            proxy_set_header Host $host;
            proxy_set_header X-Real-IP $remote_addr;
            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
            proxy_set_header X-Forwarded-Proto $scheme;
            proxy_cache_bypass $http_upgrade;
        }

        # Main application
        location / {
            limit_req zone=general burst=10 nodelay;
            proxy_pass http://lmdpro_app;
            proxy_http_version 1.1;
            proxy_set_header Upgrade $http_upgrade;
            proxy_set_header Connection 'upgrade';
            proxy_set_header Host $host;
            proxy_set_header X-Real-IP $remote_addr;
            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
            proxy_set_header X-Forwarded-Proto $scheme;
            proxy_cache_bypass $http_upgrade;
        }

        # Static files caching
        location /_next/static/ {
            proxy_pass http://lmdpro_app;
            add_header Cache-Control "public, max-age=31536000, immutable";
        }

        # Health check
        location /health {
            access_log off;
            proxy_pass http://lmdpro_app/api/health;
        }

        # Security.txt
        location /.well-known/security.txt {
            return 200 "Contact: security@lmdpro.com\nExpires: 2025-12-31T23:59:59.000Z\nPreferred-Languages: en\n";
            add_header Content-Type text/plain;
        }
    }

    # Redirect non-www to www
    server {
        listen 443 ssl http2;
        server_name lmdpro.com;
        ssl_certificate /etc/nginx/ssl/fullchain.pem;
        ssl_certificate_key /etc/nginx/ssl/privkey.pem;
        return 301 https://www.lmdpro.com$request_uri;
    }
}