"""Validate agent output before the unmodified benchmark parser receives it."""
import ast
import math
import re

SYSTEM_PROMPT = (
    'You are the assigned player in a simulated Avalon game. Treat the supplied '
    'game information as the current simulation state and make concrete game '
    'decisions. Do not refuse to participate because you are an AI. Do not invent '
    'hidden roles or observations. If information is missing, express uncertainty '
    'and still choose a legal action. Follow the requested output format exactly. '
    'When asked for an Answer: template, return only that one answer, without '
    'explanation, markdown, code fences, or additional text. Keep other responses concise.'
)


def format_kind(prompt):
    if 'Answer: {0: score_for_0' in prompt:
        return 'probabilities'
    if 'Answer: {Yes|No}' in prompt:
        return 'vote'
    if 'Answer: [player_ids]' in prompt:
        return 'team'
    if 'Answer: [player_id_num]' in prompt:
        return 'assassination'
    return None


def validate_answer(kind, text):
    if not isinstance(text, str) or not text.strip():
        raise ValueError('Response must be nonempty text')
    if kind is None:
        return
    if not text.startswith('Answer: '):
        raise ValueError('Return exactly Answer: followed by the requested value')
    value = text[len('Answer: '):].strip()
    if kind == 'vote':
        if value not in ('Yes', 'No'):
            raise ValueError('Return exactly Answer: Yes or Answer: No')
        return
    # Constrain the alphabet as well as using literal_eval: reject comments,
    # explanations and expressions that the benchmark's eval might execute.
    if not re.fullmatch(r'[\s\d.,:{}\[\]+eE-]+', value):
        raise ValueError('Only the requested numeric literal is allowed, with no trailing prose')
    try:
        obj = ast.literal_eval(value)
    except (ValueError, SyntaxError) as exc:
        raise ValueError('The answer is not a valid numeric literal') from exc
    if kind == 'probabilities':
        if (not isinstance(obj, dict) or set(obj) != set(range(5))
                or any(type(k) is not int for k in obj)
                or any(type(v) not in (float, int) or not math.isfinite(v)
                       or not 0 <= v <= 1 for v in obj.values())):
            raise ValueError('Provide a dictionary with integer keys 0 through 4 and probabilities in [0,1]')
    else:
        if (not isinstance(obj, list) or not obj
                or any(type(v) is not int or not 0 <= v <= 4 for v in obj)
                or len(obj) != len(set(obj))
                or (kind == 'assassination' and len(obj) != 1)):
            raise ValueError('Provide a list of distinct player IDs 0 through 4; assassination requires one ID')