# Copyright 2020 The Nod Team. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

# All the iree_cpu related functionalities go here.

import functools
import subprocess
import platform
from shark.parser import shark_args


def get_cpu_count():
    import multiprocessing

    try:
        cpu_count = multiprocessing.cpu_count()
        return cpu_count
    except NotImplementedError:
        return None


# Get the default cpu args.
@functools.cache
def get_iree_cpu_args():
    uname = platform.uname()
    os_name, proc_name = uname.system, uname.machine

    if os_name == "Darwin":
        kernel_version = uname.release
        target_triple = f"{proc_name}-apple-darwin{kernel_version}"
    elif os_name == "Linux":
        target_triple = f"{proc_name}-linux-gnu"
    elif os_name == "Windows":
        target_triple = "x86_64-pc-windows-msvc"
    else:
        error_message = f"OS Type f{os_name} not supported and triple can't be determined, open issue to dSHARK team please :)"
        raise Exception(error_message)
    print(f"Target triple found:{target_triple}")
    return [
        f"--iree-llvmcpu-target-triple={target_triple}",
    ]


# Get iree runtime flags for cpu
@functools.cache
def get_iree_cpu_rt_args():
    default = get_cpu_count()
    default = default if default <= 8 else default - 2
    cpu_count = (
        default
        if shark_args.task_topology_max_group_count is None
        else shark_args.task_topology_max_group_count
    )
    return [f"--task_topology_max_group_count={cpu_count}"]