#!/usr/bin/env python2.7
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""" Python utility to build opt and counters benchmarks """

import bm_constants

import argparse
import subprocess
import multiprocessing
import os
import shutil


def _args():
  argp = argparse.ArgumentParser(description='Builds microbenchmarks')
  argp.add_argument(
    '-b',
    '--benchmarks',
    nargs='+',
    choices=bm_constants._AVAILABLE_BENCHMARK_TESTS,
    default=bm_constants._AVAILABLE_BENCHMARK_TESTS,
    help='Which benchmarks to build')
  argp.add_argument(
    '-j',
    '--jobs',
    type=int,
    default=multiprocessing.cpu_count(),
    help='How many CPUs to dedicate to this task')
  argp.add_argument(
    '-n',
    '--name',
    type=str,
    help='Unique name of this build. To be used as a handle to pass to the other bm* scripts'
  )
  args = argp.parse_args()
  assert args.name
  return args


def _make_cmd(cfg, benchmarks, jobs):
  return ['make'] + benchmarks + ['CONFIG=%s' % cfg, '-j', '%d' % jobs]


def build(name, benchmarks, jobs):
  shutil.rmtree('bm_diff_%s' % name, ignore_errors=True)
  subprocess.check_call(['git', 'submodule', 'update'])
  try:
    subprocess.check_call(_make_cmd('opt', benchmarks, jobs))
    subprocess.check_call(_make_cmd('counters', benchmarks, jobs))
  except subprocess.CalledProcessError, e:
    subprocess.check_call(['make', 'clean'])
    subprocess.check_call(_make_cmd('opt', benchmarks, jobs))
    subprocess.check_call(_make_cmd('counters', benchmarks, jobs))
  os.rename(
    'bins',
    'bm_diff_%s' % name,)


if __name__ == '__main__':
  args = _args()
  build(args.name, args.benchmarks, args.jobs)