"""
APE Map Type - Map<K, V>

Key-value mappings with type constraints.

Author: David Van Aelst
Status: v1.0.0 scaffold - implementation pending
"""

from typing import TypeVar, Generic, Dict, Optional

K = TypeVar('K')
V = TypeVar('V')


class ApeMap(Generic[K, V]):
    """
    Type-safe map/dictionary implementation for APE.
    
    Example:
        scores: Map<String, Integer> = {"Alice": 100, "Bob": 95}
        scores["Alice"]  # Returns 100
        scores.set("Charlie", 90)
    
    Operations:
        - Get: map[key]
        - Set: map.set(key, value)
        - Has: map.has(key)
        - Keys: map.keys()
        - Values: map.values()
        - Items: map.items()
    
    TODO:
        - Implement __init__ with type parameters
        - Implement key access with KeyError handling
        - Implement set, get, has, delete
        - Implement keys(), values(), items() iterators
        - Implement type validation on all operations
    """
    
    def __init__(self, key_type: type, value_type: type, items: Optional[Dict[K, V]] = None):
        """
        Initialize a typed map.
        
        Args:
            key_type: The type of keys
            value_type: The type of values
            items: Optional initial items
        """
        self._key_type = key_type
        self._value_type = value_type
        self._items: Dict[K, V] = items if items is not None else {}
        # TODO: Validate all keys and values match types
    
    def __getitem__(self, key: K) -> V:
        """TODO: Implement with key existence checking"""
        raise NotImplementedError("Map key access not yet implemented")
    
    def set(self, key: K, value: V) -> None:
        """TODO: Implement with type checking"""
        raise NotImplementedError("Map.set() not yet implemented")
    
    def has(self, key: K) -> bool:
        """TODO: Check if key exists"""
        raise NotImplementedError("Map.has() not yet implemented")
    
    def __repr__(self) -> str:
        return f"ApeMap<{self._key_type.__name__}, {self._value_type.__name__}>({self._items})"
