from __future__ import annotations

import random
from typing import Dict


class BotRandomizer:
    """
    Encapsulates weighted random selection for bot generation style groups.
    """

    def __init__(self, weights_cfg: Dict[str, Dict[str, int]]) -> None:
        # Shallow copy to avoid external mutation
        self._weights_cfg: Dict[str, Dict[str, int]] = dict(weights_cfg or {})

    def choose_style(self) -> Dict[str, str]:
        selected: Dict[str, str] = {}
        for group_name, options in self._weights_cfg.items():
            option_names = list(options.keys())
            if not option_names:
                continue
            option_weights = [int(w) for w in options.values()]
            normalized = [w if w > 0 else 1 for w in option_weights]
            chosen = random.choices(option_names, weights=normalized, k=1)[0]
            selected[group_name] = chosen
        return selected