#!/usr/bin/env python3
"""Check decoded NEC32 hex samples; does not capture or transmit infrared."""
import argparse
from collections import Counter

def check(lines):
    counts = Counter()
    for number, line in enumerate(lines, 1):
        value = line.partition('#')[0].strip()
        if not value:
            continue
        try:
            frame = bytes.fromhex(value)
        except ValueError as error:
            raise ValueError(f'line {number}: invalid hex') from error
        if len(frame) != 4:
            raise ValueError(f'line {number}: expected 4 bytes')
        if frame[2] ^ frame[3] != 0xff:
            raise ValueError(f'line {number}: command complement mismatch')
        counts[frame.hex(' ').upper()] += 1
    return counts

def main():
    p = argparse.ArgumentParser(description=__doc__)
    p.add_argument('samples', help='UTF-8 text: one decoded 4-byte frame per line')
    args = p.parse_args()
    try:
        with open(args.samples, encoding='utf-8') as stream:
            counts = check(stream)
    except (OSError, ValueError) as error:
        p.exit(2, str(error) + '\n')
    if not counts:
        p.exit(2, 'no frames\n')
    for value, count in counts.most_common():
        print(f'{value}: {count} frame(s); repeated={count >= 2}')
    print('This checks bytes only, not timing, origin or appliance response.')

if __name__ == '__main__':
    main()