"""
Relationship management for entity framework.

Handles foreign key validation and relationship resolution.
"""

from dataclasses import dataclass
from typing import Any


@dataclass
class Relationship:
    """Represents a relationship between entities."""

    name: str
    source_entity: str
    target_entity: str
    foreign_key: str
    relationship_type: str


class RelationshipManager:
    """Manages relationships between entities."""

    def __init__(self):
        self._relationships: dict[str, list[Relationship]] = {}

    def register(self, relationship: Relationship) -> None:
        """Register a relationship."""
        if relationship.source_entity not in self._relationships:
            self._relationships[relationship.source_entity] = []

        self._relationships[relationship.source_entity].append(relationship)

    def get_relationships(self, entity_name: str) -> list[Relationship]:
        """Get all relationships for an entity."""
        return self._relationships.get(entity_name, [])

    def validate_foreign_key(
        self, source_entity: str, target_entity: str, foreign_key_value: Any
    ) -> bool:
        """Validate that a foreign key value exists in the target entity."""
        # TODO: Implement foreign key validation
        return True
