"""Redis scheduler implementation (placeholder)."""

# from __future__ import annotations as _annotations

# import json
# from collections.abc import AsyncIterator
# from typing import Any

# import redis.asyncio as redis
# from opentelemetry.trace import get_current_span

# from bindu.common.protocol.types import TaskIdParams, TaskSendParams
# from bindu.utils.logging import get_logger

# logger = get_logger("bindu.server.scheduler.redis_scheduler")

# from .base import (
#     Scheduler,
#     TaskOperation,
#     _CancelTask,
#     _PauseTask,
#     _ResumeTask,
#     _RunTask,
# )


# class RedisScheduler(Scheduler):
#     """A Redis-based scheduler using Upstash Redis for distributed task operations."""

#     def __init__(
#         self,
#         redis_url: str,
#         queue_name: str = "bindu:tasks",
#         max_connections: int = 10,
#         retry_on_timeout: bool = True,
#     ):
#         """Initialize Redis scheduler.

#         Args:
#             redis_url: Upstash Redis URL (redis://...)
#             queue_name: Redis queue name for task operations
#             max_connections: Maximum Redis connection pool size
#             retry_on_timeout: Whether to retry on Redis timeout
#         """
#         self.redis_url = redis_url
#         self.queue_name = queue_name
#         self.max_connections = max_connections
#         self.retry_on_timeout = retry_on_timeout
#         self._redis_client: redis.Redis | None = None

#     async def __aenter__(self):
#         """Initialize Redis connection pool."""
#         self._redis_client = redis.from_url(
#             self.redis_url,
#             encoding="utf-8",
#             decode_responses=True,
#             max_connections=self.max_connections,
#             retry_on_timeout=self.retry_on_timeout,
#         )

#         # Test connection
#         await self._redis_client.ping()
#         return self

#     async def __aexit__(self, exc_type: Any, exc_value: Any, traceback: Any):
#         """Close Redis connection pool."""
#         if self._redis_client:
#             await self._redis_client.aclose()
#             self._redis_client = None

#     async def run_task(self, params: TaskSendParams) -> None:
#         """Send a run task operation to Redis queue."""
#         task_operation = _RunTask(operation="run", params=params, _current_span=get_current_span())
#         await self._push_task_operation(task_operation)

#     async def cancel_task(self, params: TaskIdParams) -> None:
#         """Send a cancel task operation to Redis queue."""
#         task_operation = _CancelTask(operation="cancel", params=params, _current_span=get_current_span())
#         await self._push_task_operation(task_operation)

#     async def pause_task(self, params: TaskIdParams) -> None:
#         """Send a pause task operation to Redis queue."""
#         task_operation = _PauseTask(operation="pause", params=params, _current_span=get_current_span())
#         await self._push_task_operation(task_operation)

#     async def resume_task(self, params: TaskIdParams) -> None:
#         """Send a resume task operation to Redis queue."""
#         task_operation = _ResumeTask(operation="resume", params=params, _current_span=get_current_span())
#         await self._push_task_operation(task_operation)

#     async def receive_task_operations(self) -> AsyncIterator[TaskOperation]:
#         """Receive task operations from Redis queue using blocking pop."""
#         if not self._redis_client:
#             raise RuntimeError("Redis client not initialized. Use async context manager.")

#         while True:
#             try:
#                 # Blocking pop with 1 second timeout
#                 result = await self._redis_client.blpop(self.queue_name, timeout=1)

#                 if result:
#                     _, task_data = result
#                     task_operation = self._deserialize_task_operation(task_data)
#                     yield task_operation

#             except redis.RedisError as e:
#                 # Log error and continue (could add exponential backoff here)
#                 print(f"Redis error in receive_task_operations: {e}")
#                 continue
#             except Exception as e:
#                 # Log unexpected errors
#                 print(f"Unexpected error in receive_task_operations: {e}")
#                 continue

#     async def _push_task_operation(self, task_operation: TaskOperation) -> None:
#         """Push a task operation to Redis queue."""
#         if not self._redis_client:
#             raise RuntimeError("Redis client not initialized. Use async context manager.")

#         serialized_task = self._serialize_task_operation(task_operation)
#         await self._redis_client.rpush(self.queue_name, serialized_task)

#     def _serialize_task_operation(self, task_operation: TaskOperation) -> str:
#         """Serialize task operation to JSON string for Redis storage."""
#         # Convert span to string representation (spans are not JSON serializable)
#         serializable_task = {
#             "operation": task_operation["operation"],
#             "params": task_operation["params"],
#             "span_id": str(task_operation["_current_span"].get_span_context().span_id),
#             "trace_id": str(task_operation["_current_span"].get_span_context().trace_id),
#         }
#         return json.dumps(serializable_task)

#     def _deserialize_task_operation(self, task_data: str) -> TaskOperation:
#         """Deserialize task operation from JSON string."""
#         data = json.loads(task_data)

#         # Reconstruct the task operation (span will be recreated by the worker)
#         if data["operation"] == "run":
#             return _RunTask(
#                 operation="run",
#                 params=data["params"],
#                 _current_span=get_current_span(),  # Use current span context
#             )
#         elif data["operation"] == "cancel":
#             return _CancelTask(operation="cancel", params=data["params"], _current_span=get_current_span())
#         elif data["operation"] == "pause":
#             return _PauseTask(operation="pause", params=data["params"], _current_span=get_current_span())
#         elif data["operation"] == "resume":
#             return _ResumeTask(operation="resume", params=data["params"], _current_span=get_current_span())
#         else:
#             raise ValueError(f"Unknown operation type: {data['operation']}")

#     async def get_queue_length(self) -> int:
#         """Get the current length of the task queue."""
#         if not self._redis_client:
#             raise RuntimeError("Redis client not initialized. Use async context manager.")

#         return await self._redis_client.llen(self.queue_name)

#     async def clear_queue(self) -> int:
#         """Clear all tasks from the queue. Returns number of tasks removed."""
#         if not self._redis_client:
#             raise RuntimeError("Redis client not initialized. Use async context manager.")

#         return await self._redis_client.delete(self.queue_name)

#     async def health_check(self) -> bool:
#         """Check if Redis connection is healthy."""
#         try:
#             if not self._redis_client:
#                 return False
#             await self._redis_client.ping()
#             return True
#         except Exception:
#             return False
