upstream tx_api {
  server api:8080;
}

server {
  listen 80;
  server_name _;

  client_max_body_size 50m;

  # WebSocket / Socket.IO upgrade for /api/socket.io
  location /api/socket.io/ {
    proxy_pass http://tx_api;
    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 3600s;
    proxy_send_timeout 3600s;
  }

  # Forward all /api requests to the Node API server
  location /api/ {
    proxy_pass http://tx_api;
    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_read_timeout 300s;
    proxy_send_timeout 300s;
  }

  # Static SPA assets with hashed filenames — cache aggressively
  location /assets/ {
    root /usr/share/nginx/html;
    expires 1y;
    access_log off;
    add_header Cache-Control "public, immutable";
    try_files $uri =404;
  }

  # SPA fallback — every unknown path returns index.html
  location / {
    root /usr/share/nginx/html;
    index index.html;
    try_files $uri $uri/ /index.html;
    add_header Cache-Control "no-cache";
  }
}