#!/usr/bin/env python3
"""
kis_trader/backtest/optuna_search_space.py — Optuna 탐색 공간 (Grid 축 재사용)
==============================================================================
각 전략 Grid 와 동일한 이산 축을 trial.suggest_categorical 로 샘플링.
"""
from __future__ import annotations

from typing import Any, Dict, List

import optuna

from kis_trader.backtest.param_search_breakout import _breakout_grids
from kis_trader.backtest.param_search_momentum import (
    _momentum_combo_grid_valid,
    _momentum_grids,
)
from kis_trader.backtest.tail_param_search import _tail_grids


def _dedupe_preserve_order(values: List[Any]) -> List[Any]:
    seen = set()
    out: List[Any] = []
    for v in values:
        key = v if isinstance(v, (int, float, str, bool)) else repr(v)
        if key in seen:
            continue
        seen.add(key)
        out.append(v)
    return out


def _suggest_from_grid(trial: optuna.Trial, grid: Dict[str, List[Any]]) -> Dict[str, Any]:
    combo: Dict[str, Any] = {}
    for key, values in grid.items():
        if not values:
            continue
        choices = _dedupe_preserve_order(list(values))
        combo[key] = trial.suggest_categorical(key, choices)
    return combo


def suggest_tail_params(trial: optuna.Trial, mode: str) -> Dict[str, Any]:
    return _suggest_from_grid(trial, _tail_grids(mode))


def suggest_momentum_params(trial: optuna.Trial, mode: str) -> Dict[str, Any]:
    combo = _suggest_from_grid(trial, _momentum_grids()[mode])
    if not _momentum_combo_grid_valid(combo):
        raise optuna.TrialPruned("momentum invalid combo")
    return combo


def suggest_breakout_params(trial: optuna.Trial, mode: str) -> Dict[str, Any]:
    combo = _suggest_from_grid(trial, _breakout_grids()[mode])
    if "prev_chg_min" in combo and "prev_chg_max" in combo:
        if float(combo["prev_chg_min"]) >= float(combo["prev_chg_max"]):
            raise optuna.TrialPruned("breakout prev_chg invalid")
    return combo


def tail_grid_axis_keys(mode: str) -> List[str]:
    return list(_tail_grids(mode).keys())


def momentum_grid_axis_keys(mode: str) -> List[str]:
    return list(_momentum_grids()[mode].keys())


def breakout_grid_axis_keys(mode: str) -> List[str]:
    return list(_breakout_grids()[mode].keys())
