import argparse
import os
import shlex
import subprocess
import sys

from setup_helpers.cuda import USE_CUDA

if __name__ == '__main__':
    # Placeholder for future interface. For now just gives a nice -h.
    parser = argparse.ArgumentParser(description='Build libtorch')
    args = parser.parse_args()

    os.environ['BUILD_TORCH'] = 'ON'
    os.environ['ONNX_NAMESPACE'] = 'onnx_torch'

    tools_path = os.path.dirname(os.path.abspath(__file__))
    build_pytorch_libs = os.path.join(tools_path, 'build_pytorch_libs.sh')

    command = '{} --use-nnpack '.format(build_pytorch_libs)
    if USE_CUDA:
        command += '--use-cuda '
    command += 'caffe2'

    sys.stdout.flush()
    sys.stderr.flush()
    subprocess.check_call(shlex.split(command), universal_newlines=True)