# /etc/nginx/sites-available/it-ticket-system
# Symlink to sites-enabled:
#   sudo ln -s /etc/nginx/sites-available/it-ticket-system /etc/nginx/sites-enabled/

upstream it_ticket_app {
    server 127.0.0.1:5000 fail_timeout=0;
}

# Redirect HTTP → HTTPS
server {
    listen 80;
    server_name tickets.yourdomain.com;
    return 301 https://$host$request_uri;
}

server {
    listen 443 ssl http2;
    server_name tickets.yourdomain.com;

    # ── SSL Certificates (Let's Encrypt / certbot) ──────────────────────────
    ssl_certificate     /etc/letsencrypt/live/tickets.yourdomain.com/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/tickets.yourdomain.com/privkey.pem;
    ssl_protocols       TLSv1.2 TLSv1.3;
    ssl_ciphers         HIGH:!aNULL:!MD5;
    ssl_prefer_server_ciphers on;
    ssl_session_cache   shared:SSL:10m;
    ssl_session_timeout 10m;

    # ── Security Headers ────────────────────────────────────────────────────
    add_header Strict-Transport-Security "max-age=63072000; includeSubDomains; preload";
    add_header X-Frame-Options           SAMEORIGIN;
    add_header X-Content-Type-Options    nosniff;
    add_header X-XSS-Protection          "1; mode=block";
    add_header Referrer-Policy           "strict-origin-when-cross-origin";

    # ── Logging ─────────────────────────────────────────────────────────────
    access_log /var/log/nginx/it_tickets_access.log;
    error_log  /var/log/nginx/it_tickets_error.log warn;

    # ── Client limits ───────────────────────────────────────────────────────
    client_max_body_size 20M;

    # ── Static files (served directly by nginx) ─────────────────────────────
    location /static/ {
        alias /var/www/it-ticket-system/app/static/;
        expires 7d;
        add_header Cache-Control "public, immutable";
        access_log off;
    }

    # ── WebSocket (Socket.IO) ───────────────────────────────────────────────
    location /socket.io/ {
        proxy_pass         http://it_ticket_app;
        proxy_http_version 1.1;
        proxy_set_header   Upgrade    $http_upgrade;
        proxy_set_header   Connection "upgrade";
        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_read_timeout 86400;
    }

    # ── Application ─────────────────────────────────────────────────────────
    location / {
        proxy_pass         http://it_ticket_app;
        proxy_redirect     off;
        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_connect_timeout 60s;
        proxy_send_timeout    60s;
        proxy_read_timeout    60s;
        proxy_buffering       on;
        proxy_buffer_size     8k;
        proxy_buffers         8 8k;
    }
}