# --- persistence/db_storage.py ---
# Purpose: Implements persistence using a database.
# Responsibilities:
# - Connects to a DB (e.g., PostgreSQL, SQLite).
# - Serializes the WorkflowState to JSON and saves it.
# - Deserializes JSON from the DB to restore a WorkflowState.

from highway_core.engine.state import WorkflowState
from .manager import PersistenceManager


class DatabasePersistence(PersistenceManager):
    def __init__(self, connection_string: str = "sqlite:///highway.db"):
        self.connection_string = connection_string
        print(f"DatabasePersistence initialized: {connection_string}")
        # self._create_tables()

    def _create_tables(self):
        # Logic to create 'workflow_runs' table if not exists
        pass

    def save_workflow_state(self, workflow_id: str, state: WorkflowState):
        # We can't use model_dump_json() as WorkflowState is not a Pydantic model
        # This is a stub implementation
        print(f"  [Persistence] STUB: Saving state for {workflow_id} to DB.")
        # DB connection logic:
        # INSERT OR UPDATE workflow_runs SET state = ? WHERE id = ?
        pass

    def load_workflow_state(self, workflow_id: str) -> WorkflowState:
        print(f"  [Persistence] STUB: Loading state for {workflow_id} from DB.")
        # DB connection logic:
        # SELECT state FROM workflow_runs WHERE id = ?
        # state_json = ...
        # return WorkflowState.model_validate_json(state_json)
        # For now, return a new empty state
        return WorkflowState({})
