# CHORUS Services Website - Production Nginx Configuration
# Optimized for performance, security, and Traefik integration

events {
    worker_connections 1024;
    use epoll;
    multi_accept on;
}

http {
    # Basic settings
    sendfile on;
    tcp_nopush on;
    tcp_nodelay on;
    keepalive_timeout 65;
    types_hash_max_size 2048;
    client_max_body_size 20M;
    
    # Hide nginx version
    server_tokens off;
    
    # MIME types
    include /etc/nginx/mime.types;
    default_type application/octet-stream;
    
    # Logging
    log_format main '$remote_addr - $remote_user [$time_local] "$request" '
                    '$status $body_bytes_sent "$http_referer" '
                    '"$http_user_agent" "$http_x_forwarded_for"';
    
    access_log /var/log/nginx/access.log main;
    error_log /var/log/nginx/error.log warn;
    
    # Gzip compression
    gzip on;
    gzip_vary on;
    gzip_min_length 1000;
    gzip_proxied any;
    gzip_comp_level 6;
    gzip_types
        text/plain
        text/css
        text/xml
        text/javascript
        application/javascript
        application/xml+rss
        application/json
        image/svg+xml;
    
    # Brotli compression (if available)
    # brotli on;
    # brotli_comp_level 6;
    # brotli_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 "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 Permissions-Policy "camera=(), microphone=(), geolocation=()" always;
    
    # Cache settings for static assets
    map $sent_http_content_type $expires {
        default                    off;
        text/html                  epoch;
        text/css                   max;
        application/javascript     max;
        ~image/                    1y;
        ~font/                     1y;
        application/pdf            1M;
    }
    
    expires $expires;
    
    # Rate limiting
    limit_req_zone $binary_remote_addr zone=website:10m rate=10r/s;
    
    # Upstream for Next.js server
    upstream nextjs {
        server 127.0.0.1:3000;
        keepalive 32;
    }
    
    server {
        listen 80;
        server_name _;
        root /usr/share/nginx/html;
        index index.html;
        
        # Security: Hide .files
        location ~ /\. {
            deny all;
            access_log off;
            log_not_found off;
        }
        
        # Rate limiting
        limit_req zone=website burst=20 nodelay;
        
        # Health check endpoint
        location /health {
            access_log off;
            return 200 "healthy\n";
            add_header Content-Type text/plain;
        }
        
        # Static assets from Next.js build
        location /_next/static/ {
            alias /usr/share/nginx/html/_next/static/;
            expires 1y;
            add_header Cache-Control "public, immutable";
            
            # Brotli/Gzip pre-compressed files
            location ~* \.(js|css)$ {
                gzip_static on;
                expires 1y;
                add_header Cache-Control "public, immutable";
            }
        }
        
        # Public assets
        location /images/ {
            alias /usr/share/nginx/html/images/;
            expires 1M;
            add_header Cache-Control "public";
        }
        
        location /icons/ {
            alias /usr/share/nginx/html/icons/;
            expires 1M;
            add_header Cache-Control "public";
        }
        
        # Favicon and manifest files
        location ~* ^/(favicon\.ico|manifest\.json|robots\.txt|sitemap\.xml)$ {
            expires 1w;
            add_header Cache-Control "public";
        }
        
        # Next.js API routes and pages
        location / {
            try_files $uri $uri/ @nextjs;
        }
        
        # Proxy to Next.js server
        location @nextjs {
            proxy_pass http://nextjs;
            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;
            
            # Buffer settings
            proxy_buffering on;
            proxy_buffer_size 128k;
            proxy_buffers 4 256k;
            proxy_busy_buffers_size 256k;
        }
        
        # Error pages
        error_page 404 /404.html;
        error_page 500 502 503 504 /500.html;
        
        location = /404.html {
            root /usr/share/nginx/html;
            internal;
        }
        
        location = /500.html {
            root /usr/share/nginx/html;
            internal;
        }
    }
}