events {
    worker_connections 1024;
}

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

    # Access log format – captures real client IP via X-Forwarded-For
    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;

    gzip       on;
    gzip_types text/plain text/css application/json application/javascript;
    sendfile   on;

    # ── HTTP → HTTPS redirect ─────────────────────────────────────────────────
    server {
        listen 80;
        server_name DOMAIN_PLACEHOLDER;
        return 301 https://$host$request_uri;
    }

    # ── HTTPS server ──────────────────────────────────────────────────────────
    server {
        listen 443 ssl;
        server_name DOMAIN_PLACEHOLDER;

        ssl_certificate     /etc/letsencrypt/live/DOMAIN_PLACEHOLDER/fullchain.pem;
        ssl_certificate_key /etc/letsencrypt/live/DOMAIN_PLACEHOLDER/privkey.pem;
        ssl_protocols       TLSv1.2 TLSv1.3;
        ssl_ciphers         HIGH:!aNULL:!MD5;

        access_log /var/log/nginx/access.log main;

        # Static frontend (served by nginx directly)
        location / {
            root  /usr/share/nginx/html;
            index index.html;
            try_files $uri $uri/ /index.html;
        }

        # Backend API
        location /api/ {
            proxy_pass         http://backend:8000;
            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;
        }

        # Short link redirects
        location /s/ {
            proxy_pass         http://backend:8000;
            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;
        }

        # Health check
        location /health {
            proxy_pass http://backend:8000;
        }
    }
}