server {
    listen 80;
    server_name localhost fibdash.local fibdash.growheads.de;
    
    # Enable gzip compression
    gzip on;
    gzip_types text/plain text/css application/json application/javascript text/xml application/xml application/xml+rss text/javascript;
    
    # Security headers
    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";
    
    # Relaxed CSP for development with Google Sign-In
    add_header Content-Security-Policy "default-src 'self'; script-src 'self' 'unsafe-inline' 'unsafe-eval' https://accounts.google.com https://apis.google.com https://www.google.com https://ssl.gstatic.com; style-src 'self' 'unsafe-inline' https://fonts.googleapis.com https://accounts.google.com; font-src 'self' https://fonts.gstatic.com; img-src 'self' data: https: https://accounts.google.com https://ssl.gstatic.com; connect-src 'self' https://accounts.google.com https://www.googleapis.com; frame-src https://accounts.google.com;";
    
    # Proxy settings for WebSocket connections (for hot reload)
    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;
    
    # API routes - proxy to Express backend
    location /api/ {
        proxy_pass http://localhost:5000;
        proxy_redirect off;
        
        # CORS headers for development
        add_header Access-Control-Allow-Origin *;
        add_header Access-Control-Allow-Methods "GET, POST, PUT, DELETE, OPTIONS";
        add_header Access-Control-Allow-Headers "Authorization, Content-Type, Accept";
        
        # Handle preflight requests
        if ($request_method = 'OPTIONS') {
            add_header Access-Control-Allow-Origin *;
            add_header Access-Control-Allow-Methods "GET, POST, PUT, DELETE, OPTIONS";
            add_header Access-Control-Allow-Headers "Authorization, Content-Type, Accept";
            add_header Content-Length 0;
            add_header Content-Type text/plain;
            return 204;
        }
    }
    
    # WebSocket proxy for webpack-dev-server hot reload
    location /ws {
        proxy_pass http://localhost:5001;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "Upgrade";
        proxy_set_header Host $host;
    }
    
    # Webpack HMR specific endpoint
    location /__webpack_hmr {
        proxy_pass http://localhost:5001;
        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;
    }
    
    # Static assets and main application - proxy to webpack-dev-server
    location / {
        proxy_pass http://localhost:5001;
        proxy_redirect off;
        
        # Enable hot module replacement
        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;
        
        # Handle WebSocket upgrade for HMR
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection $connection_upgrade;
        
        # Disable caching for development
        add_header Cache-Control "no-cache, no-store, must-revalidate";
        add_header Pragma "no-cache";
        add_header Expires "0";
    }
    
    # Health check endpoint
    location /health {
        access_log off;
        return 200 "healthy\n";
        add_header Content-Type text/plain;
    }
    
    # Error pages
    error_page 404 /404.html;
    error_page 500 502 503 504 /50x.html;
    
    # Logging
    access_log /var/log/nginx/fibdash_access.log;
    error_log /var/log/nginx/fibdash_error.log warn;
}

# WebSocket upgrade map
map $http_upgrade $connection_upgrade {
    default upgrade;
    '' close;
}