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# to you under the Apache License, Version 2.0 (the
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#
#   http://www.apache.org/licenses/LICENSE-2.0
#
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"""Vulkan-owned backend hooks."""

from pathlib import Path

from tvm_ffi.libinfo import load_lib_ctypes

from tvm.base import _LOADED_LIBS


def _detect_target_from_device(dev):
    from tvm import get_global_func  # pylint: disable=import-outside-toplevel
    from tvm.target import Target  # pylint: disable=import-outside-toplevel

    f_get_target_property = get_global_func("device_api.vulkan.get_target_property")
    return Target(
        {
            "kind": "vulkan",
            "max_threads_per_block": dev.max_threads_per_block,
            "max_shared_memory_per_block": dev.max_shared_memory_per_block,
            "thread_warp_size": dev.warp_size,
            "supports_float16": f_get_target_property(dev, "supports_float16"),
            "supports_int8": f_get_target_property(dev, "supports_int8"),
            "supports_int16": f_get_target_property(dev, "supports_int16"),
            "supports_int64": f_get_target_property(dev, "supports_int64"),
            "supports_8bit_buffer": f_get_target_property(dev, "supports_8bit_buffer"),
            "supports_16bit_buffer": f_get_target_property(dev, "supports_16bit_buffer"),
            "supports_storage_buffer_storage_class": f_get_target_property(
                dev, "supports_storage_buffer_storage_class"
            ),
        }
    )


def register_backend():
    """Register Vulkan-owned Python semantics."""
    from tvm.target.detect_target import register_device_target_detector

    runtime_dir = Path(_LOADED_LIBS["tvm_runtime"]._name).resolve().parent
    try:
        # Runtime sidecars only need registration side effects; libtvm_runtime is global.
        _LOADED_LIBS["tvm_runtime_vulkan"] = load_lib_ctypes(
            package="tvm",
            target_name="tvm_runtime_vulkan",
            extra_lib_paths=[runtime_dir],
            mode="RTLD_LOCAL",
        )
    except (OSError, FileNotFoundError, RuntimeError):
        pass
    register_device_target_detector("vulkan", _detect_target_from_device)
    return None


__all__ = ["register_backend"]
