events {
    worker_connections 1024;
}

http {
    include /etc/nginx/mime.types;
    default_type application/octet-stream;

    # Logging
    log_format main '$remote_addr - $remote_user [$time_local] "$request" '
                    '$status $body_bytes_sent "$http_referer" '
                    '"$http_user_agent" "$http_x_forwarded_for"';
    
    access_log /var/log/nginx/access.log main;
    error_log /var/log/nginx/error.log warn;

    # 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;

    server {
        listen 80;
        server_name localhost;
        root /usr/share/nginx/html;
        index index.html;

        # Security headers (adjusted)
        add_header X-Frame-Options "SAMEORIGIN" 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;

        # Frontend - serve index.html for all routes
        location / {
            try_files $uri $uri/ /index.html;
            add_header Cache-Control "no-cache, no-store, must-revalidate";
            add_header Pragma "no-cache";
            add_header Expires "0";
        }

        # Static assets with correct MIME types
        location ~* \.(css|js)$ {
            try_files $uri =404;
            expires 1y;
            add_header Cache-Control "public, immutable";
            access_log off;
            
            # Ensure correct MIME types
            types {
                text/css css;
                application/javascript js;
            }
        }

        # Images and fonts
        location ~* \.(png|jpg|jpeg|gif|ico|svg|woff|woff2|ttf|eot)$ {
            try_files $uri =404;
            expires 1y;
            add_header Cache-Control "public, immutable";
            access_log off;
        }

        # API Proxy - remove from frontend nginx
        # Backend will be accessed directly by frontend JavaScript

        # Health check
        location /health {
            access_log off;
            return 200 "healthy\n";
            add_header Content-Type text/plain;
        }

        # Deny access to hidden files
        location ~ /\. {
            deny all;
            access_log off;
            log_not_found off;
        }

        # Error pages
        error_page 404 /index.html;
        error_page 500 502 503 504 /50x.html;
        location = /50x.html {
            root /usr/share/nginx/html;
            internal;
        }
    }
}