server {
    listen 80;
    server_name localhost;

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

    # Increase max request size for logo uploads (32MB)
    client_max_body_size 32M;

    # Gzip compression
    gzip on;
    gzip_types text/plain text/css application/json application/javascript text/xml application/xml application/xml+rss text/javascript;

    # Cache static assets
    location ~* \.(js|css|png|jpg|jpeg|gif|svg|ico|woff|woff2|ttf|eot)$ {
        expires 1y;
        add_header Cache-Control "public, immutable";
    }

    # API proxy to backend
    location /api/ {
        client_max_body_size 32M;
        proxy_pass http://backend:8080/;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection 'upgrade';
        proxy_set_header Host $host;
        proxy_cache_bypass $http_upgrade;
        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;
        
        # CORS headers - Allow all origins
        add_header 'Access-Control-Allow-Origin' '*' always;
        add_header 'Access-Control-Allow-Methods' 'GET, POST, PUT, DELETE, OPTIONS, PATCH, HEAD' always;
        add_header 'Access-Control-Allow-Headers' '*' always;
        add_header 'Access-Control-Expose-Headers' '*' always;
        add_header 'Access-Control-Max-Age' '3600' always;
        
        # Handle preflight requests
        if ($request_method = 'OPTIONS') {
            return 204;
        }
    }

    # SPA fallback
    location / {
        # CORS headers - Allow all origins for static content
        add_header 'Access-Control-Allow-Origin' '*' always;
        add_header 'Access-Control-Allow-Methods' 'GET, POST, PUT, DELETE, OPTIONS, PATCH, HEAD' always;
        add_header 'Access-Control-Allow-Headers' '*' always;
        
        try_files $uri $uri/ /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;
}