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"""Global communication backend management.

Provides global singleton instances for CommBackend and TritonRSAGBackend.
"""

from tokenspeed.runtime.distributed.comm_backend.base import CommBackend

_global_backend: CommBackend | None = None


def initialize_comm_backend(
    use_pynccl: bool = False,
    use_custom_allreduce: bool = False,
) -> CommBackend:
    """Create and configure the global communication backend."""
    global _global_backend

    from tokenspeed.runtime.distributed.comm_backend.auto import AutoBackend

    _global_backend = AutoBackend()
    _global_backend.configure(
        use_pynccl=use_pynccl,
        use_custom_allreduce=use_custom_allreduce,
    )
    return _global_backend


def get_global_backend() -> CommBackend:
    """Get the global CommBackend, creating AutoBackend if not initialized."""
    global _global_backend
    if _global_backend is None:
        initialize_comm_backend()
    return _global_backend