"""
Realm class as main interface (placeholder).

This module will contain the Realm class that serves as the main interface
for the molecular space representation system.
"""

from typing import List, Optional, Union

import numpy as np

from .bond_list import BondList
from .structure import Structure
from .structure_ensemble import StructureEnsemble


class Realm:
    """
    Placeholder for Realm class.

    This will be implemented in Phase 5, Task 5.1 of the implementation plan.
    """

    def __init__(self, structure: Optional[Structure] = None):
        """
        Placeholder initialization.

        Args:
            structure: Optional Structure to initialize with
        """
        self.structure = structure

    def __repr__(self) -> str:
        return f"Realm(structure={self.structure})"
