worker_processes auto;
error_log /var/log/nginx/error.log warn;
pid /var/run/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 2048;

    # Gzip compression
    gzip on;
    gzip_vary on;
    gzip_proxied any;
    gzip_comp_level 6;
    gzip_min_length 1000;
    gzip_types
        text/plain
        text/css
        text/javascript
        application/javascript
        application/json
        application/x-javascript
        application/xml
        application/xml+rss
        image/svg+xml
        font/woff
        font/woff2;

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

        # 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;

        # SPA routing: all routes fall back to index.html
        location / {
            try_files $uri $uri/ /index.html;
        }

        # No cache for index.html (ensures updates are picked up)
        location = /index.html {
            add_header Cache-Control "no-cache, no-store, must-revalidate";
            add_header Pragma "no-cache";
            add_header Expires "0";
        }

        # Long cache for Flutter assets (content-hash naming ensures freshness)
        location ~* \.(js|css|woff|woff2|ttf|eot|ico|png|jpg|jpeg|gif|svg|webp)$ {
            expires 1y;
            add_header Cache-Control "public, immutable";
            access_log off;
        }

        # Cache manifest and version files briefly
        location ~* \.(json|webmanifest)$ {
            expires 1h;
            add_header Cache-Control "public";
        }

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