def parse_bsrate_report(report):
    """Parse bsrate report file."""
    bsrate_dict = {}
    with open(report, 'r') as r:
        first_line = r.readline()
        if not first_line.startswith(
            'Bisulfite conversion rate process skipped.'):
            bsrate_dict['Overall conversion rate'] = first_line.split()[-1]
            for strand in ['positive', 'negative']:
                line = r.readline().split()
                bsrate_dict[f'Conversion rate on {strand}'] = line[-2]
                bsrate_dict[f'Number of nucleotides used on {strand} strand'
                    ] = line[-1]
    return bsrate_dict
