"""Bounded real Gomocup subprocess comparison; no score or production data writes.
Example: .venvs/gomoku/bin/python games/gomoku/tests/compare.py --output /tmp/gomoku.json
Use --season for the six benchmark openings, or --openings 10 for fresh paired ones.
"""
import argparse
import json
import pathlib
import random
import sys
import time

ROOT = pathlib.Path(__file__).resolve().parents[1]
sys.path.insert(0, str(ROOT / 'referee'))
from gomoku import match

parser = argparse.ArgumentParser()
parser.add_argument('--season', action='store_true')
parser.add_argument('--seed', type=int, default=20261023)
parser.add_argument('--openings', type=int, default=10)
parser.add_argument('--output', type=pathlib.Path)
args = parser.parse_args()
if not 1 <= args.openings <= 30:
    parser.error('--openings must be between 1 and 30')
if args.season:
    openings = [[tuple(map(int, p.split(','))) for p in line.split()]
                for line in (ROOT / 'referee/openings.txt').read_text().splitlines()
                if line and not line.startswith('#')]
else:
    rng = random.Random(args.seed)
    pool = [(x, y) for x in range(4, 11) for y in range(4, 11) if (x, y) != (7, 7)]
    openings = [[(7, 7), *rng.sample(pool, 2)] for _ in range(args.openings)]
new = ([sys.executable, str(ROOT / 'field/threats/bot.py')], str(ROOT))
old = ([sys.executable, str(ROOT / 'tests/fixtures/legacy_threats.py')], str(ROOT))
results, started = [], time.monotonic()
for opening in openings:
    for colour in (0, 1):
        r = match([new, old] if colour == 0 else [old, new], opening)
        results.append({'opening': opening, 'colour': colour, 'winner': r['winner'],
                        'won': r['winner'] == colour, 'moves': len(r['moves']),
                        'max_ms': max(m[2] for m in r['moves']), 'reason': r['reason']})
    print(json.dumps({'games': len(results), 'wins': sum(r['won'] for r in results)}), flush=True)
summary = {'games': len(results), 'wins': sum(r['won'] for r in results),
           'max_ms': max(r['max_ms'] for r in results), 'seconds': time.monotonic() - started}
print(json.dumps(summary))
if args.output:
    args.output.write_text(json.dumps({'summary': summary, 'games': results}, indent=2))