"""What every game's referee shares: where the bots are, how a match is seated, and the files a run leaves.

check:    the route's bot plays every bot of the season's field (field/<name>/), seats swapped; the score is the mean
          over the field and each opponent is a subtask. metrics.json is what the site keeps (scienceslack.json names it).
practice: a few matches against the field, each leaving a replay in replays/ and an entry in replays/matches.json.
"""
import json, os, sys


def bot_dir(arg):
    """The route's folder the check was given, absolute (bots run in their own folder); a missing bot is the route's
    mistake, said plainly."""
    if not os.path.isdir(arg):
        sys.exit(f'No route folder at {arg}')
    return os.path.abspath(arg)


def field(root='field'):
    return sorted(d for d in os.listdir(root) if os.path.isdir(os.path.join(root, d)) and not d.startswith('.'))


def route_name():
    d = os.environ.get('SS_ROUTE_DIR', 'routes').rstrip('/')
    return 'main' if d == 'routes' else d.split('/', 1)[-1]


def write_metrics(score, subtasks, cost=None, path='metrics.json'):
    out = {'score': round(score, 6), 'subtasks': {k: round(v, 6) for k, v in subtasks.items()}}
    if cost is not None:
        out['cost'] = round(cost, 3)
    with open(path, 'w') as f:
        json.dump(out, f, indent=2, sort_keys=True)
    print(f'score {out["score"]} over {len(subtasks)}: ' + ', '.join(f'{k} {v:.3g}' for k, v in out['subtasks'].items()))


class Replays:
    """replays/<file> per match, and replays/matches.json saying who sat where and how it ended."""

    def __init__(self, root='replays'):
        self.root, self.index = root, []
        os.makedirs(root, exist_ok=True)

    def add(self, file, data, title, seats, result):
        with open(os.path.join(self.root, file), 'w') as f:
            f.write(data if isinstance(data, str) else json.dumps(data, separators=(',', ':')))
        self.index.append({'file': file, 'title': title, 'seats': seats, 'result': result})
        with open(os.path.join(self.root, 'matches.json'), 'w') as f:
            json.dump(self.index, f, indent=2)