# Vision Videoke Nginx Configuration
# Place this file in /etc/nginx/sites-available/visionvideoke
# Then create symlink: sudo ln -s /etc/nginx/sites-available/visionvideoke /etc/nginx/sites-enabled/

# Rate limiting
limit_req_zone $binary_remote_addr zone=api:10m rate=10r/s;
limit_req_zone $binary_remote_addr zone=upload:10m rate=2r/s;

# Upstream for Node.js application
upstream visionvideoke_app {
    server 127.0.0.1:3000;
    keepalive 32;
}

# HTTP to HTTPS redirect
server {
    listen 80;
    server_name YOUR_DOMAIN_HERE www.YOUR_DOMAIN_HERE;
    
    # Let's Encrypt challenge
    location /.well-known/acme-challenge/ {
        root /var/www/html;
    }
    
    # Redirect all other traffic to HTTPS
    location / {
        return 301 https://$server_name$request_uri;
    }
}

# HTTPS server
server {
    listen 443 ssl http2;
    server_name YOUR_DOMAIN_HERE www.YOUR_DOMAIN_HERE;
    
    # SSL Configuration
    ssl_certificate /etc/letsencrypt/live/YOUR_DOMAIN_HERE/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/YOUR_DOMAIN_HERE/privkey.pem;
    
    # SSL Security Settings
    ssl_protocols TLSv1.2 TLSv1.3;
    ssl_ciphers ECDHE-RSA-AES256-GCM-SHA512:DHE-RSA-AES256-GCM-SHA512:ECDHE-RSA-AES256-GCM-SHA384:DHE-RSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-SHA384;
    ssl_prefer_server_ciphers off;
    ssl_session_cache shared:SSL:10m;
    ssl_session_timeout 10m;
    ssl_stapling on;
    ssl_stapling_verify on;
    
    # Security Headers
    add_header Strict-Transport-Security "max-age=31536000; includeSubDomains" always;
    add_header X-Frame-Options DENY always;
    add_header X-Content-Type-Options nosniff always;
    add_header X-XSS-Protection "1; mode=block" always;
    add_header Referrer-Policy "strict-origin-when-cross-origin" always;
    add_header Content-Security-Policy "default-src 'self'; script-src 'self' 'unsafe-inline' 'unsafe-eval' https://cdn.jsdelivr.net https://unpkg.com; style-src 'self' 'unsafe-inline' https://fonts.googleapis.com; font-src 'self' https://fonts.gstatic.com; img-src 'self' data: https:; media-src 'self' https:; connect-src 'self' https:; frame-src 'none';" always;
    
    # Logging
    access_log /var/log/nginx/visionvideoke_access.log;
    error_log /var/log/nginx/visionvideoke_error.log;
    
    # Root directory for static files
    root /var/www/visionvideoke/dist;
    index index.html;
    
    # Gzip compression
    gzip on;
    gzip_vary on;
    gzip_min_length 1024;
    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/atom+xml
        image/svg+xml;
    
    # Client upload limits
    client_max_body_size 100M;
    client_body_timeout 60s;
    client_header_timeout 60s;
    
    # API routes with rate limiting
    location /api/ {
        limit_req zone=api burst=20 nodelay;
        
        proxy_pass http://visionvideoke_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_cache_bypass $http_upgrade;
        
        # Timeouts
        proxy_connect_timeout 60s;
        proxy_send_timeout 60s;
        proxy_read_timeout 60s;
    }
    
    # Upload endpoints with stricter rate limiting
    location /api/upload {
        limit_req zone=upload burst=5 nodelay;
        
        proxy_pass http://visionvideoke_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_cache_bypass $http_upgrade;
        
        # Extended timeouts for uploads
        proxy_connect_timeout 300s;
        proxy_send_timeout 300s;
        proxy_read_timeout 300s;
    }
    
    # Static files with caching
    location ~* \.(js|css|png|jpg|jpeg|gif|ico|svg|woff|woff2|ttf|eot)$ {
        expires 1y;
        add_header Cache-Control "public, immutable";
        add_header X-Content-Type-Options nosniff;
        
        # Try files first, then proxy to app
        try_files $uri $uri/ @proxy;
    }
    
    # HTML files with short cache
    location ~* \.html$ {
        expires 1h;
        add_header Cache-Control "public, must-revalidate";
        add_header X-Content-Type-Options nosniff;
        
        try_files $uri $uri/ @proxy;
    }
    
    # Health check endpoint
    location /health {
        access_log off;
        return 200 "healthy\n";
        add_header Content-Type text/plain;
    }
    
    # Robots.txt
    location /robots.txt {
        add_header Content-Type text/plain;
        return 200 "User-agent: *\nDisallow: /api/\nDisallow: /admin/\n";
    }
    
    # Favicon
    location /favicon.ico {
        log_not_found off;
        access_log off;
        expires 1y;
        add_header Cache-Control "public, immutable";
    }
    
    # Default location - serve React app
    location / {
        try_files $uri $uri/ @proxy;
    }
    
    # Proxy fallback for SPA routing
    location @proxy {
        proxy_pass http://visionvideoke_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_cache_bypass $http_upgrade;
    }
    
    # Block access to sensitive files
    location ~ /\. {
        deny all;
        access_log off;
        log_not_found off;
    }
    
    location ~ ~$ {
        deny all;
        access_log off;
        log_not_found off;
    }
    
    # Block access to package files
    location ~ (package\.json|package-lock\.json|yarn\.lock)$ {
        deny all;
        access_log off;
        log_not_found off;
    }
}