#!/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)