events {
  worker_connections 1024;
}

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

  # Logging
  access_log /var/log/nginx/access.log;
  error_log /var/log/nginx/error.log;

  # Performance
  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 text/javascript application/json application/javascript application/xml+rss application/rss+xml font/truetype font/opentype application/vnd.ms-fontobject image/svg+xml;

  server {
    listen 80;
    server_name _;

    root /usr/share/nginx/html;
    index index.html;

    # 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 "no-referrer-when-downgrade" always;

    # IMPORTANT: Headers required for FFmpeg.wasm SharedArrayBuffer support
    add_header Cross-Origin-Embedder-Policy "require-corp" always;
    add_header Cross-Origin-Opener-Policy "same-origin" always;

    # Cache static assets (including WASM files)
    location ~* \.(js|css|png|jpg|jpeg|gif|ico|svg|woff|woff2|ttf|eot|wasm)$ {
      expires 1y;
      add_header Cache-Control "public, immutable";
      # Ensure COOP/COEP headers are also set for static assets
      add_header Cross-Origin-Embedder-Policy "require-corp" always;
      add_header Cross-Origin-Opener-Policy "same-origin" always;
    }

    # Serve index.html for all routes (SPA)
    location / {
      try_files $uri $uri/ /index.html;
      add_header Cache-Control "no-cache";
      # Ensure COOP/COEP headers for HTML
      add_header Cross-Origin-Embedder-Policy "require-corp" always;
      add_header Cross-Origin-Opener-Policy "same-origin" always;
    }

    # Health check endpoint
    location /health {
      access_log off;
      return 200 "healthy\n";
      add_header Content-Type text/plain;
    }
  }
}