"""Gameplay trace log — console + logs/trace.log.

Tags: flow (game events), llm (transport: live/mock/timing), ai (full model
payloads), vald (validation rejects with reason), econ (guardrails/economy).
"""
from __future__ import annotations

import json
import logging
import pathlib

LOG_PATH = pathlib.Path(__file__).resolve().parent.parent / "logs" / "trace.log"

logger = logging.getLogger("bds")
if not logger.handlers:
    logger.setLevel(logging.INFO)
    logger.propagate = False
    fmt = logging.Formatter("%(asctime)s %(message)s", datefmt="%H:%M:%S")
    stream = logging.StreamHandler()
    stream.setFormatter(fmt)
    logger.addHandler(stream)  # always log to stdout (HF captures this)
    # file log is best-effort — on read-only / non-writable hosts (HF Spaces)
    # just skip it rather than crash the whole app at import
    try:
        LOG_PATH.parent.mkdir(exist_ok=True)
        filehandler = logging.FileHandler(LOG_PATH, encoding="utf-8")
        filehandler.setFormatter(fmt)
        logger.addHandler(filehandler)
    except OSError:
        pass


def trace(tag: str, msg: str) -> None:
    logger.info(f"[{tag:<4}] {msg}")


def trace_payload(payload: dict) -> None:
    try:
        trace("ai", json.dumps(payload, ensure_ascii=False))
    except (TypeError, ValueError):
        trace("ai", repr(payload)[:800])