"""Low-level connection management for Jena stores."""

from __future__ import annotations

import time
from queue import Queue
from typing import Any, Self

from libraries.ontology.bnop.rdf_jena.configurations.jena_configurations import (
    JenaConfigurations,
)


class JenaConnectionError(Exception):
    """Raised when a Jena connection cannot be established."""


class JenaConnections:
    """Manage pooled connections to a Jena store."""

    def __init__(
        self,
        configuration: JenaConfigurations,
        pool_size: int = 1,
        max_retries: int = 3,
        retry_delay: float = 0.1,
    ) -> None:
        self.configuration = configuration
        self.pool: Queue[Any] = Queue(maxsize=pool_size)
        self.max_retries = max_retries
        self.retry_delay = retry_delay
        for _ in range(pool_size):
            self.pool.put(self._create_connection_with_retry())

    def _create_connection(self) -> dict[str, str]:
        """Create a raw connection object.

        Placeholder implementation to avoid heavy dependencies.
        """
        return {"store_type": self.configuration.jena_store_type}

    def _close_connection(self, connection: dict[str, str]) -> None:
        """Close a connection if necessary."""

    def _health_check(self, connection: dict[str, str]) -> bool:
        """Verify that the connection is alive."""
        return True

    def _create_connection_with_retry(self) -> dict[str, str]:
        for attempt in range(1, self.max_retries + 1):
            connection = self._create_connection()
            if self._health_check(connection):
                return connection
            time.sleep(self.retry_delay * attempt)
        raise JenaConnectionError("unable to establish connection")

    def acquire(self) -> dict[str, str]:
        """Get a connection from the pool."""
        connection = self.pool.get()
        if not self._health_check(connection):
            connection = self._create_connection_with_retry()
        return connection

    def release(self, connection: dict[str, str]) -> None:
        """Return a connection to the pool."""
        self.pool.put(connection)

    def close(self) -> None:
        """Close all pooled connections."""
        while not self.pool.empty():
            connection = self.pool.get()
            self._close_connection(connection)

    def __enter__(self) -> Self:
        return self

    def __exit__(
        self,
        exc_type,
        exc_value,
        traceback,
    ) -> None:
        self.close()
