def format_file_size(size_bytes):
    """Format file size in bytes to human-readable format"""
    if size_bytes < 1024:
        return f"{size_bytes} bytes"
    elif size_bytes < 1024 * 1024:
        return f"{size_bytes / 1024:.2f} KB"
    elif size_bytes < 1024 * 1024 * 1024:
        return f"{size_bytes / (1024 * 1024):.2f} MB"
    else:
        return f"{size_bytes / (1024 * 1024 * 1024):.2f} GB"

def get_file_icon(mime_type, filename):
    """Get Font Awesome icon class based on file type"""
    # Extract extension from filename
    extension = filename.split('.')[-1].lower() if '.' in filename else ''
    
    # Define icon mapping
    icon_map = {
        # Documents
        'pdf': 'fa-file-pdf',
        'doc': 'fa-file-word',
        'docx': 'fa-file-word',
        'txt': 'fa-file-alt',
        'rtf': 'fa-file-alt',
        'odt': 'fa-file-alt',
        
        # Spreadsheets
        'xls': 'fa-file-excel',
        'xlsx': 'fa-file-excel',
        'csv': 'fa-file-csv',
        
        # Presentations
        'ppt': 'fa-file-powerpoint',
        'pptx': 'fa-file-powerpoint',
        
        # Images
        'jpg': 'fa-file-image',
        'jpeg': 'fa-file-image',
        'png': 'fa-file-image',
        'gif': 'fa-file-image',
        'svg': 'fa-file-image',
        'webp': 'fa-file-image',
        
        # Audio
        'mp3': 'fa-file-audio',
        'wav': 'fa-file-audio',
        'ogg': 'fa-file-audio',
        
        # Video
        'mp4': 'fa-file-video',
        'avi': 'fa-file-video',
        'mov': 'fa-file-video',
        'wmv': 'fa-file-video',
        
        # Archives
        'zip': 'fa-file-archive',
        'rar': 'fa-file-archive',
        '7z': 'fa-file-archive',
        'tar': 'fa-file-archive',
        'gz': 'fa-file-archive',
        
        # Code
        'html': 'fa-file-code',
        'css': 'fa-file-code',
        'js': 'fa-file-code',
        'py': 'fa-file-code',
        'java': 'fa-file-code',
        'php': 'fa-file-code',
        'c': 'fa-file-code',
        'cpp': 'fa-file-code',
        'h': 'fa-file-code',
    }
    
    # Check if we have an icon for this extension
    if extension in icon_map:
        return icon_map[extension]
    
    # If not, try to determine from mime type
    if mime_type:
        if mime_type.startswith('image/'):
            return 'fa-file-image'
        elif mime_type.startswith('audio/'):
            return 'fa-file-audio'
        elif mime_type.startswith('video/'):
            return 'fa-file-video'
        elif mime_type.startswith('text/'):
            return 'fa-file-alt'
        elif 'pdf' in mime_type:
            return 'fa-file-pdf'
        elif 'msword' in mime_type or 'document' in mime_type:
            return 'fa-file-word'
        elif 'excel' in mime_type or 'spreadsheet' in mime_type:
            return 'fa-file-excel'
        elif 'powerpoint' in mime_type or 'presentation' in mime_type:
            return 'fa-file-powerpoint'
        elif 'zip' in mime_type or 'compressed' in mime_type or 'archive' in mime_type:
            return 'fa-file-archive'
    
    # Default icon
    return 'fa-file'