user nginx;
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_types text/plain text/css text/xml application/json application/javascript application/rss+xml application/atom+xml 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 "strict-origin-when-cross-origin" always;

    # Upstream backend
    upstream aoc_backend {
        server backend:8000;
    }

    # HTTP → HTTPS redirect (optional; enable once TLS is configured)
    # server {
    #     listen 80;
    #     server_name _;
    #     return 301 https://$host$request_uri;
    # }

    server {
        listen 80;
        server_name _;

        client_max_body_size 50M;
        proxy_connect_timeout 60s;
        proxy_send_timeout 60s;
        proxy_read_timeout 60s;

        location / {
            proxy_pass http://aoc_backend;
            proxy_http_version 1.1;
            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;
            proxy_buffering off;
        }
    }

    # HTTPS server (uncomment and configure once you have certificates)
    # server {
    #     listen 443 ssl http2;
    #     server_name _;
    #
    #     ssl_certificate /etc/nginx/ssl/cert.pem;
    #     ssl_certificate_key /etc/nginx/ssl/key.pem;
    #     ssl_protocols TLSv1.2 TLSv1.3;
    #     ssl_ciphers HIGH:!aNULL:!MD5;
    #     ssl_prefer_server_ciphers on;
    #
    #     client_max_body_size 50M;
    #
    #     location / {
    #         proxy_pass http://aoc_backend;
    #         proxy_http_version 1.1;
    #         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;
    #         proxy_buffering off;
    #     }
    # }
}