server {
    listen       8080;
    server_name  localhost;
    root   /usr/share/nginx/html;
    index  index.html;

    # CORS headers for API endpoints
    add_header Access-Control-Allow-Origin *;
    add_header Access-Control-Allow-Methods "GET, OPTIONS";
    add_header Access-Control-Allow-Headers "DNT,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range";

    # Security headers
    add_header X-Frame-Options DENY;
    add_header X-Content-Type-Options nosniff;
    add_header Referrer-Policy same-origin;

    # Gzip
    gzip on;
    gzip_types text/html text/css application/javascript application/json;

    # Jaeger API proxy
    location /api/jaeger/ {
        proxy_pass http://jaeger:16686/;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_http_version 1.1;
        proxy_read_timeout 30s;
    }

    # Jaeger UI
    location /jaeger/ {
        proxy_pass http://jaeger:16686/;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
        proxy_read_timeout 86400s;
    }

    # OTel collector prometheus metrics
    location /api/metrics {
        proxy_pass http://otel-collector:8889/metrics;
        proxy_set_header Host $host;
        proxy_read_timeout 10s;
    }

    # OTel collector health
    location /api/health {
        proxy_pass http://otel-collector:8888/healthz;
        proxy_set_header Host $host;
        proxy_read_timeout 5s;
    }

    # Static files (including index.html)
    location / {
        try_files $uri $uri/ /index.html;
        expires 5s;
        add_header Cache-Control "public, must-revalidate";
    }

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

    error_page 404 /index.html;
}