# Running as non-root user defined by container user; omit nginx "user" directive
worker_processes auto;
error_log /var/log/nginx/error.log notice;
pid /tmp/nginx.pid;

events {
    worker_connections 1024;
}

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

    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;

    sendfile        on;
    tcp_nopush      on;
    tcp_nodelay     on;
    keepalive_timeout  65;
    types_hash_max_size 4096;

    # Gzip Settings
    gzip on;
    gzip_vary on;
    gzip_min_length 10240;
    gzip_proxied expired no-cache no-store private auth;
    gzip_types
        text/plain
        text/css
        text/xml
        text/javascript
        application/javascript
        application/xml+rss
        application/json
        image/svg+xml;

    # Security Headers
    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 "no-referrer-when-downgrade" always;
    add_header Content-Security-Policy "default-src 'self'; script-src 'self' 'wasm-unsafe-eval'; style-src 'self' 'unsafe-inline'; img-src 'self' data:; font-src 'self';" always;
    add_header Strict-Transport-Security "max-age=31536000; includeSubDomains" always;

    server {
        listen 4000;
        server_name localhost;

        root /usr/share/nginx/html;
        index index.html;

        # Main application route
        location / {
            try_files $uri $uri/ /index.html;

            # Cache static assets
            location ~* \.(js|css|png|jpg|jpeg|gif|ico|svg|woff|woff2|ttf|eot)$ {
                expires 1y;
                add_header Cache-Control "public, immutable";
            }

            # Source maps - no cache for development
            location ~* \.map$ {
                expires off;
                add_header Cache-Control "no-cache, no-store, must-revalidate";
            }
        }

        # Handle webpack development paths (return 404 gracefully)
        location ~* ^/webpack:// {
            return 404;
        }

        # Health check endpoint
        location /health {
            access_log off;
            add_header Content-Type application/json;
            return 200 '{"status":"ok","service":"web-app"}\n';
        }

        # API proxy (if needed for backend communication)
        location /api/ {
            proxy_pass http://localhost:8081/;
            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;
        }

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