# Copyright (c) Facebook, Inc. and its affiliates.
#
# This source code is licensed under the MIT license found in the
# LICENSE file in the root directory of this source tree.

import argparse
import numpy as np
import sys


aggregate_funcs = {
    'std': np.std,
    'var': np.var,
    'median': np.median,
    'mean': np.mean,
    'min': np.min,
    'max': np.max,
}


def main():
    parser = argparse.ArgumentParser()
    parser.add_argument('-i', '--input_file', required=True, type=str)
    parser.add_argument('-n', '--repeat_times', required=True, type=int)
    parser.add_argument('-o', '--output_file', required=False)
    parser.add_argument('-f', '--func', required=False, default='mean')
    args = parser.parse_args()

    stream = open(args.output_file, 'w') if args.output_file else sys.stdout

    segment_scores = []
    for line in open(args.input_file):
        segment_scores.append(float(line.strip()))
        if len(segment_scores) == args.repeat_times:
            stream.write('{}\n'.format(aggregate_funcs[args.func](segment_scores)))
            segment_scores = []


if __name__ == '__main__':
    main()
