# Rate limit zone for API endpoints — adjust as needed
limit_req_zone $binary_remote_addr zone=api_limit:10m rate=30r/s;
limit_req_zone $binary_remote_addr zone=auth_limit:10m rate=5r/s;

# Upstream pointing to the Swarm nginx container's published port
upstream cba_swarm {
    server 127.0.0.1:8081;
    keepalive 32;
}

# HTTP → HTTPS redirect (certbot will modify this once cert is issued)
server {
    listen 80;
    listen [::]:80;
    server_name api.viscountmfb.net;

    # Allow Let's Encrypt challenges
    location /.well-known/acme-challenge/ {
        root /var/www/html;
    }

    location / {
        return 301 https://$host$request_uri;
    }
}

# HTTPS server
server {
    listen 443 ssl http2;
    listen [::]:443 ssl http2;
    server_name api.viscountmfb.net;

    # SSL hardening
    ssl_protocols TLSv1.2 TLSv1.3;
    ssl_prefer_server_ciphers on;
    ssl_ciphers ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384;
    ssl_session_timeout 1d;
    ssl_session_cache shared:SSL:50m;
    ssl_session_tickets off;
    ssl_stapling on;
    ssl_stapling_verify on;

    # Security headers
    add_header Strict-Transport-Security "max-age=31536000; includeSubDomains" always;
    add_header X-Frame-Options "SAMEORIGIN" always;
    add_header X-Content-Type-Options "nosniff" always;
    add_header Referrer-Policy "strict-origin-when-cross-origin" always;
    add_header X-XSS-Protection "1; mode=block" always;
    # Tighten this CSP based on your actual frontend needs
    # add_header Content-Security-Policy "default-src 'self'" always;

    # Logging — separate access and error logs for this site
    access_log /var/log/nginx/cbaapi.access.log;
    error_log /var/log/nginx/cbaapi.error.log warn;

    # Body size for KYC uploads, statement attachments, etc.
    client_max_body_size 25M;
    client_body_timeout 60s;
    client_header_timeout 60s;

    # Proxy timeouts — adjust if you have long-running endpoints
    proxy_connect_timeout 30s;
    proxy_send_timeout 60s;
    proxy_read_timeout 60s;

    # Buffering for upstream responses
    proxy_buffering on;
    proxy_buffer_size 8k;
    proxy_buffers 16 8k;

    # Block common probe paths to reduce log noise
    location ~* \.(env|git|sql|bak|log|conf)$ {
        deny all;
        return 404;
    }
    location = /.env { deny all; return 404; }
    location ~ /\.(?!well-known) { deny all; return 404; }

    # Stricter rate limit for auth endpoints
    location ~ ^/(api/(login|register|password)|auth) {
        limit_req zone=auth_limit burst=10 nodelay;
        proxy_pass http://cba_swarm;
        include /etc/nginx/proxy_params_cbaapi;
    }

    # General API rate limit
    location /api/ {
        limit_req zone=api_limit burst=50 nodelay;
        proxy_pass http://cba_swarm;
        include /etc/nginx/proxy_params_cbaapi;
    }

    # Everything else
    location / {
        proxy_pass http://cba_swarm;
        include /etc/nginx/proxy_params_cbaapi;
    }
}