"""RadixTree data structure for efficient string lookups."""

from __future__ import annotations


class RadixTreeNode:
    """A node in the RadixTree."""

    def __init__(self) -> None:
        """Initialize a RadixTree node."""
        self.children: dict[str, RadixTreeNode] = {}
        self.is_end_of_word = False
        self.value: str | None = None


class RadixTree:
    """RadixTree data structure for efficient string storage and retrieval."""

    def __init__(self) -> None:
        """Initialize the RadixTree."""
        self.root = RadixTreeNode()

    def insert(self, word: str) -> None:
        """Insert a word into the RadixTree."""
        # TODO: Implement RadixTree insertion
        # This is a placeholder implementation
        pass

    def search(self, word: str) -> bool:
        """Search for a word in the RadixTree."""
        # TODO: Implement RadixTree search
        # This is a placeholder implementation
        return False

    def starts_with(self, prefix: str) -> list[str]:
        """Find all words that start with the given prefix."""
        # TODO: Implement prefix search
        # This is a placeholder implementation
        return []

    def get_suggestions(self, word: str, max_distance: int = 2) -> list[str]:
        """Get word suggestions within edit distance."""
        # TODO: Implement edit distance based suggestions
        # This is a placeholder implementation
        return []

    def delete(self, word: str) -> bool:
        """Delete a word from the RadixTree."""
        # TODO: Implement RadixTree deletion
        # This is a placeholder implementation
        return False

    def size(self) -> int:
        """Get the number of words in the RadixTree."""
        # TODO: Implement size calculation
        # This is a placeholder implementation
        return 0
