# =============================================================================
# Apache Configuration for KubeDiagrams Frontend
# =============================================================================
# - Serves static React files
# - Proxies /api/* requests to the backend
# - Handles SPA routing (React Router)
# - Forwards real client IP to backend
# =============================================================================

<VirtualHost *:80>
    ServerAdmin webmaster@localhost
    DocumentRoot /usr/local/apache2/htdocs

    # Logs
    ErrorLog /dev/stderr
    CustomLog /dev/stdout combined

    # Enable mod_rewrite for SPA routing
    <Directory "/usr/local/apache2/htdocs">
        Options Indexes FollowSymLinks
        AllowOverride All
        Require all granted

        # React Router: redirect all non-file requests to index.html
        RewriteEngine On
        RewriteBase /
        RewriteRule ^index\.html$ - [L]
        RewriteCond %{REQUEST_FILENAME} !-f
        RewriteCond %{REQUEST_FILENAME} !-d
        RewriteCond %{REQUEST_URI} !^/api/
        RewriteRule . /index.html [L]
    </Directory>

    # Proxy API requests to backend
    ProxyPreserveHost On
    ProxyPass /api/ http://backend:5000/api/
    ProxyPassReverse /api/ http://backend:5000/api/

    # Forward client IP to backend
    # If X-Forwarded-For already exists (from upstream proxy), keep it
    # Otherwise, set it to the client's IP
    RequestHeader setifempty X-Forwarded-For "expr=%{REMOTE_ADDR}"
    RequestHeader setifempty X-Real-IP "expr=%{REMOTE_ADDR}"
    RequestHeader set X-Forwarded-Proto "http"
    RequestHeader set X-Forwarded-Host "expr=%{HTTP_HOST}"

    # Timeout for long diagram generation requests
    ProxyTimeout 300

</VirtualHost>