"""
Maintenance field interpreter.

This interpreter extracts structured information about maintenance
capabilities from standardized AIP fields.
"""

import re
import logging
from typing import Dict, List, Any, Optional
from .base import BaseInterpreter, InterpretationResult

logger = logging.getLogger(__name__)

class MaintenanceInterpreter(BaseInterpreter):
    """
    Interprets maintenance field information.
    
    Processes standardized field 406 (Maintenance) to extract:
    - Small aircraft maintenance availability
    - Maintenance types available
    - Maintenance capabilities
    """
    
    def get_standard_field_id(self) -> int:
        """Return the standard field ID for maintenance (406)."""
        return 406
    
    def get_structured_fields(self) -> List[str]:
        """Return list of structured fields this interpreter calculates."""
        return [
            'small_aircraft_available',  # Whether small aircraft maintenance is available
            'maintenance_available',     # Whether any maintenance is available
            'maintenance_types',         # List of maintenance types available
            'engine_maintenance',        # Whether engine maintenance is available
            'airframe_maintenance',      # Whether airframe maintenance is available
            'avionics_maintenance'       # Whether avionics maintenance is available
        ]
    
    def interpret_field_value(self, field_value: str, airport: Optional['Airport'] = None) -> Optional[Dict[str, Any]]:
        """
        Interpret a maintenance field value into structured data.
        
        Args:
            field_value: The raw field value to interpret
            airport: Optional airport object for additional context
            
        Returns:
            Dictionary with structured maintenance information, or None if interpretation failed
        """
        return self._interpret_maintenance_field(field_value, airport.ident if airport else None)
    
    def _interpret_maintenance_field(self, field_value: str, airport_icao: str) -> Optional[Dict[str, Any]]:
        """
        Interpret a maintenance field value into structured data.
        
        Args:
            field_value: The raw field value to interpret
            airport_icao: ICAO code for logging purposes
            
        Returns:
            Dictionary with structured maintenance information, or None if interpretation failed
        """
        # TODO: Implement maintenance field interpretation logic
        # This is where we'll add regex patterns and parsing logic
        
        # For now, return a placeholder structure
        return {
            'small_aircraft_available': None,
            'maintenance_available': None,
            'maintenance_types': [],
            'engine_maintenance': None,
            'airframe_maintenance': None,
            'avionics_maintenance': None,
            'raw_value': field_value  # Keep original value for reference
        } 