```python
import re
import random
from typing import Any, Dict, Optional, Tuple, List
import textarena as ta


class HoneyHeistBattleEnv(ta.Env):
    """
    Environment for "Honey Heist: Battle of the Bears".
    Two rival bears compete for honey in a turn-based deterministic environment.
    """

    def __init__(self, max_turns: Optional[int] = 20):
        self.max_turns = max_turns
        # regex patterns for validation
        self.patterns = {
            "forage": re.compile(r"^\[Forage:(1|2|3)\]$"),
            "steal": re.compile(r"^\[Steal:(1|2|3)\]$"),
            "defend": re.compile(r"^\[Defend\]$"),
        }

    # --------------------------------------------------------------------- #
    # Helper for extracting boxed content
    # --------------------------------------------------------------------- #
    def _extract_answer_content(self, action: str) -> str:
        """Extract content inside \boxed{} or return full stripped string."""
        match = re.search(r'\\boxed\{([^}]*)\}', action, re.DOTALL)
        if match:
            return match.group(1).strip()
        return action.strip()

    # --------------------------------------------------------------------- #
    # Reset / Initialization
    # --------------------------------------------------------------------- #
    def reset(self, num_players: int, seed: Optional[int] = None):
        """
        Resets the environment to an initial state.
        """
        if num_players != 2:
            raise ValueError("Honey Heist: Battle of the Bears requires exactly 2 players.")

        # Initialize TwoPlayerState
        self.state = ta.TwoPlayerState(num_players=num_players, seed=seed, max_turns=self.max_turns)

        rng = random.Random(seed)
        hive_honey = rng.randint(15, 20)

        game_state = {
            "turn_number": 1,
            "current_player": "BearA",
            "hive_honey": hive_honey,
            "max_turns": self.max_turns,
            "players": {
                "BearA": {"stored_honey": 0, "last_action": None, "defending": False, "score": 0},
                "BearB": {"stored_honey": 0, "last_action": None, "defending": False, "score": 0},
            },
            "history": [],
            "winner": None,
            "draw": False,
            "seed": seed if seed is not None else 0,
        }

        role_mapping = {0: "BearA", 1: "BearB"}
        self.state.reset(game_state=game_state, player_prompt_function=self._generate_player_prompt, role_mapping=role_mapping)

        self.state.add_observation("Welcome to Honey Heist: Battle of the Bears!", ta.ObservationType.GAME_MESSAGE)
        self.state.add_observation(
            f"The hive contains {hive_honey} units of honey. BearA goes first.",
            ta.ObservationType.GAME_MESSAGE
        )

        return self.state

    # --------------------------------------------------------------------- #
    # Player Prompt Generator
    # --------------------------------------------------------------------- #
    def _generate_player_prompt(self, player_id: int, game_state: Dict[str, Any]) -> str:
        """Produce role-appropriate prompt for each bear."""
        role = "BearA" if player_id == 0 else "BearB"
        rival = "BearB" if role == "BearA" else "BearA"
        hive_honey = game_state["hive_honey"]
        player_honey = game_state["players"][role]["stored_honey"]
        rival_honey = game_state["players"][rival]["stored_honey"]
        turn_number = game_state["turn_number"]
        max_turns = game_state["max_turns"]

        prompt = f"""
You are a hungry bear competing for the last honey in the forest.

- Your goal: End the game with more honey than your rival.
- Each turn, choose ONE of the following actions:
  [Forage:X]  Gather X units (1–3) from the hive.
  [Defend]    Protect your honey from theft this turn.
  [Steal:X]   Steal X units (1–3) from your rival if they do not defend.

Game facts:
- Hive honey remaining: {hive_honey}
- Your stored honey: {player_honey}
- Rival stored honey: {rival_honey}
- Turn {turn_number} / {max_turns}

Format rule:
State your reasoning briefly, then put your final action in the following format:

"Put your final answer within \\boxed{{}} at the end of your response."

Example valid response:
I think foraging is safe early on.
\\boxed{{[Forage:3]}}

Example invalid response:
\\boxed{{Forage 3}}  <-- Must include brackets and colon.
"""
        return prompt.strip()

    # --------------------------------------------------------------------- #
    # Step - main game logic
    # --------------------------------------------------------------------- #
    def step(self, action: str) -> Tuple[bool, ta.Info]:
        """
        Perform a single environment step for the current player.
        """
        player_id = self.state.current_player_id
        player_role = "BearA" if player_id == 0 else "BearB"
        opponent_role = "BearB" if player_role == "BearA" else "BearA"

        game_state = self.state.game_state

        # record action to transcript
        self.state.add_observation(action, ta.ObservationType.PLAYER_ACTION, from_id=player_id, to_id=-1)

        # extract and validate
        token = self._extract_answer_content(action)
        if game_state["winner"] or game_state["draw"]:
            self.state.set_invalid_move("Game is already over.")
            return self.state.step()

        valid_action = False
        reason = None
        if self.patterns["forage"].match(token):
            valid_action = True
            act_type = "forage"
            qty = int(re.findall(r"\d+", token)[0])
        elif self.patterns["steal"].match(token):
            valid_action = True
            act_type = "steal"
            qty = int(re.findall(r"\d+", token)[0])
        elif self.patterns["defend"].match(token):
            valid_action = True
            act_type = "defend"
            qty = 0
        else:
            reason = "Invalid format, must use [Forage:X], [Steal:X], or [Defend]."

        if not valid_action:
            self.state.set_invalid_move(reason)
            return self.state.step()

        # handle action
        player_data = game_state["players"][player_role]
        opp_data = game_state["players"][opponent_role]

        if act_type == "forage":
            if game_state["hive_honey"] < qty:
                self.state.set_invalid_move("Not enough honey in hive.")
                return self.state.step()
            # update hive and player
            game_state["hive_honey"] -= qty
            player_data["stored_honey"] += qty
            player_data["score"] = player_data["stored_honey"]

        elif act_type == "defend":
            player_data["defending"] = True

        elif act_type == "steal":
            if opp_data["stored_honey"] < qty:
                self.state.set_invalid_move("Opponent has insufficient honey.")
                return self.state.step()
            if opp_data["defending"]:
                transfer = 0  # blocked
            else:
                transfer = qty
                opp_data["stored_honey"] -= transfer
                player_data["stored_honey"] += transfer
            player_data["score"] = player_data["stored_honey"]
            opp_data["score"] = opp_data["stored_honey"]

        # update metadata
        player_data["last_action"] = token
        entry = {"turn": game_state["turn_number"], "actor": player_role, "action": token}
        game_state["history"].append(entry)
        game_state["current_player"] = opponent_role

        # Next player's defending status reset check
        # Every full round (both bears act), clear defending flags
        if player_role == "BearB":
            game_state["players"]["BearA"]["defending"] = False
            game_state["players"]["BearB"]["defending"] = False

        # increment turn number
        game_state["turn_number"] += 1

        # Check terminal conditions
        done = False
        reason_end = ""
        if game_state["hive_honey"] <= 0:
            done = True
            reason_end = "Hive honey depleted."
        elif game_state["turn_number"] > game_state["max_turns"]:
            done = True
            reason_end = "Maximum turns reached."
        else:
            total_honey = (
                game_state["hive_honey"]
                + game_state["players"]["BearA"]["stored_honey"]
                + game_state["players"]["BearB"]["stored_honey"]
            )
            if total_honey <= 0:
                done = True
                reason_end = "All honey depleted."

        if done:
            a_honey = game_state["players"]["BearA"]["stored_honey"]
            b_honey = game_state["players"]["BearB"]["stored_honey"]

            if a_honey > b_honey:
                game_state["winner"] = "BearA"
                self.state.set_winner(player_id=0, reason=reason_end + " BearA has more honey.")
            elif b_honey > a_honey:
                game_state["winner"] = "BearB"
                self.state.set_winner(player_id=1, reason=reason_end + " BearB has more honey.")
            else:
                game_state["draw"] = True
                self.state.set_draw(reason=reason_end + " Equal honey scores.")

        return self.state.step()

    # --------------------------------------------------------------------- #
    # Standard required Env accessors
    # --------------------------------------------------------------------- #
    def get_observation(self) -> Tuple[int, List]:
        """Return current player's observations."""
        return self.state.current_player_id, self.state.observations

    def close(self) -> Tuple[Dict, Dict]:
        """Return rewards and game_info at close."""
        return self.state.rewards, self.state.game_info
```