import logging
from typing import Tuple, Optional, List, Dict, Any

from . import element_mapper

logger = logging.getLogger(__name__)

class PrefixResolver:
    """Resolve prefixes for element mapping"""
    
    @staticmethod
    def get_element_prefix(element_label: str) -> str:
        """Extract prefix from element label"""
        if element_label and "_" in element_label:
            return element_label.split("_")[0]
        return ""
    
    @staticmethod
    def determine_prefix_to_use(element_candidate_prefix: str, group_prefix: str, 
                               element_mappings: List[Dict[str, Any]], svg_type: str) -> Tuple[Optional[str], str]:
        """Determine which prefix to use for mapping lookup
        
        Group prefixes always take precedence over element prefixes.
        """
        # First check group prefix since it should take precedence
        if group_prefix:
            _, group_match_type = element_mapper.find_mapping_for_element(
                svg_type, group_prefix, element_mappings, debug=False
            )
            if group_match_type == 'exact':
                return group_prefix, "group"
        
        # Only check element prefix if no valid group prefix exists
        if element_candidate_prefix:
            _, element_match_type = element_mapper.find_mapping_for_element(
                svg_type, element_candidate_prefix, element_mappings, debug=False
            )
            if element_match_type == 'exact':
                return element_candidate_prefix, "element"
                
        return None, "none"