#!/usr/bin/env python2
#
# Copyright 2017 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
#
# pylint: disable=cros-logging-import

"""Script to help generate json format report from raw data."""
from __future__ import print_function

import argparse
import config
import json
import logging
import sys

# Turn the logging level to INFO before importing other autotest
# code, to avoid having failed import logging messages confuse the
# test_droid user.
logging.basicConfig(level=logging.INFO)


def _parse_arguments_internal(argv):
  parser = argparse.ArgumentParser(description='Convert result to JSON'
                                   'format')

  parser.add_argument(
      '-b', '--bench', help='Generate JSON format file for which benchmark.')

  parser.add_argument(
      '-i', '--input', help='Specify the input result file name.')

  parser.add_argument(
      '-o', '--output', help='Specify the output JSON format result file')

  parser.add_argument(
      '-p',
      '--platform',
      help='Indicate the platform(experiment or device) name '
      'to be shown in JSON')

  parser.add_argument(
      '--iterations',
      type=int,
      help='How many iterations does the result include.')
  return parser.parse_args(argv)

# Collect data and generate JSON {} tuple from benchmark result
def collect_data(infile, bench, it):
  result_dict = {}
  with open(infile + str(it)) as fin:
    if bench not in config.bench_parser_dict:
      logging.error('Please input the correct benchmark name.')
      raise ValueError('Wrong benchmark name: %s' % bench)
    parse = config.bench_parser_dict[bench]
    result_dict = parse(bench, fin)
  return result_dict

# If there is no original output file, create a new one and init it.
def create_outfile(outfile, bench):
  with open(outfile, 'w') as fout:
    obj_null = {'data': {bench.lower(): []}, 'platforms': []}
    json.dump(obj_null, fout)

# Seek the original output file and try to add new result into it.
def get_outfile(outfile, bench):
  try:
    return open(outfile)
  except IOError:
    create_outfile(outfile, bench)
    return open(outfile)

def main(argv):
  arguments = _parse_arguments_internal(argv)

  bench = arguments.bench
  infile = arguments.input
  outfile = arguments.output
  platform = arguments.platform
  iteration = arguments.iterations

  result = []
  for i in range(iteration):
    result += collect_data(infile, bench, i)

  with get_outfile(outfile, bench) as fout:
    obj = json.load(fout)
  obj['platforms'].append(platform)
  obj['data'][bench.lower()].append(result)
  with open(outfile, 'w') as fout:
    json.dump(obj, fout)


if __name__ == '__main__':
  main(sys.argv[1:])