"""大分歧 / 小分歧开仓类型（趋势户）；日内户沿用 trade_style，单独 profile。"""
from __future__ import annotations

from dataclasses import dataclass
from typing import Any, Mapping, Optional, Sequence, Tuple

from lib.trade.trade_policy_lib import TradePolicy

PROFILE_TREND_DIV = "trend_div"
PROFILE_INTRADAY = "intraday"

ENTRY_MODEL_BIG_DIV_A = "big_div_a"
ENTRY_MODEL_BIG_DIV_B = "big_div_b"
ENTRY_MODEL_SMALL_DIV = "small_div"

VALID_ENTRY_MODEL_CODES = frozenset(
    {
        ENTRY_MODEL_BIG_DIV_A,
        ENTRY_MODEL_BIG_DIV_B,
        ENTRY_MODEL_SMALL_DIV,
    }
)

TREND_DIV_ENTRY_REASON_LABELS: Tuple[str, ...] = (
    "大分歧A",
    "大分歧B",
    "小分歧",
)

INTRADAY_LEGACY_TREND_ENTRY_REASONS: Tuple[str, ...] = (
    "趋势多头：4h大结构突破前进场，确认条件：三次探顶，5m收敛不创新低",
    "趋势空头：4h大结构突破前进场，确认条件：三次探底，5m收敛不创新高",
    "趋势多头：小分歧低吸入场（左侧），确认条件：二次探底",
    "趋势空头：小分歧高吸入场（左侧），确认条件：二次探顶",
    "波段单：5m顺势突破，确认条件：2根k线+成交量放大+4h同向+日成交量前20",
)

_ENTRY_SPECS: Tuple[Tuple[str, str, str, str], ...] = (
    (
        ENTRY_MODEL_BIG_DIV_A,
        "大分歧A",
        "trend",
        "突破前收敛小结构，不创新低企稳（空：不创新高）",
    ),
    (
        ENTRY_MODEL_BIG_DIV_B,
        "大分歧B",
        "trend",
        "结构突破确认后入场",
    ),
    (
        ENTRY_MODEL_SMALL_DIV,
        "小分歧",
        "swing",
        "二次探底 N 字突破，或 5m 三均线重新多头（空：二次探顶 / 空头均线）",
    ),
)

_CODE_TO_LABEL = {code: label for code, label, _, _ in _ENTRY_SPECS}
_CODE_TO_STYLE = {code: style for code, _, style, _ in _ENTRY_SPECS}
_LABEL_TO_CODE = {label: code for code, label, _, _ in _ENTRY_SPECS}
_CODE_TO_HELP = {code: help for code, _, _, help in _ENTRY_SPECS}

_INTRADAY_WHITELIST = frozenset({"BTC", "ETH"})


@dataclass(frozen=True)
class EntryModelOption:
    code: str
    label: str
    trade_style: str
    help: str


def is_intraday_trading_profile(policy: TradePolicy) -> bool:
    """日内户：启用 BTC/ETH 白名单（env 中 TRADE_SYMBOL_WHITELIST）。"""
    if not policy.symbol_restrict_enabled:
        return False
    if not policy.symbol_whitelist:
        return False
    return all(s in _INTRADAY_WHITELIST for s in policy.symbol_whitelist)


def order_entry_profile(policy: TradePolicy) -> str:
    return PROFILE_INTRADAY if is_intraday_trading_profile(policy) else PROFILE_TREND_DIV


def entry_model_options() -> Tuple[EntryModelOption, ...]:
    return tuple(
        EntryModelOption(code=code, label=label, trade_style=style, help=help)
        for code, label, style, help in _ENTRY_SPECS
    )


def normalize_entry_model_code(raw: Optional[str]) -> str:
    v = (raw or "").strip().lower()
    if v in VALID_ENTRY_MODEL_CODES:
        return v
    label = (raw or "").strip()
    if label in _LABEL_TO_CODE:
        return _LABEL_TO_CODE[label]
    return ""


def entry_model_label(code: Optional[str]) -> str:
    c = normalize_entry_model_code(code)
    return _CODE_TO_LABEL.get(c, "")


def trade_style_for_entry_model(code: Optional[str]) -> str:
    c = normalize_entry_model_code(code)
    return _CODE_TO_STYLE.get(c, "trend")


def trade_style_label_zh(trade_style: str) -> str:
    return "波段单" if (trade_style or "").strip().lower() == "swing" else "趋势单"


def trend_manual_entry_reason_count(policy: TradePolicy) -> int:
    if is_intraday_trading_profile(policy):
        return len(INTRADAY_LEGACY_TREND_ENTRY_REASONS)
    return len(TREND_DIV_ENTRY_REASON_LABELS)


def build_trend_div_entry_reason_options(
    strategy_options: Sequence[str],
) -> Tuple[str, ...]:
    return TREND_DIV_ENTRY_REASON_LABELS + tuple(strategy_options)


def build_intraday_entry_reason_options(
    key_options: Sequence[str],
    strategy_options: Sequence[str],
) -> Tuple[str, ...]:
    return INTRADAY_LEGACY_TREND_ENTRY_REASONS + tuple(key_options) + tuple(strategy_options)


def entry_reason_options_for_policy(
    policy: TradePolicy,
    key_options: Sequence[str],
    strategy_options: Sequence[str],
) -> Tuple[str, ...]:
    if is_intraday_trading_profile(policy):
        return build_intraday_entry_reason_options(key_options, strategy_options)
    return build_trend_div_entry_reason_options(strategy_options)


def parse_manual_order_style_fields(
    policy: TradePolicy,
    form: Mapping[str, Any],
    *,
    default_trade_style: str = "trend",
) -> Tuple[str, Optional[str], Optional[str]]:
    """返回 (trade_style, entry_model_code|None, error_message|None)。"""
    if is_intraday_trading_profile(policy):
        trade_style = (form.get("trade_style") or default_trade_style or "trend").strip().lower()
        if trade_style not in ("trend", "swing"):
            trade_style = "trend"
        return trade_style, None, None

    entry_model = normalize_entry_model_code(form.get("entry_model"))
    if not entry_model:
        return "", None, "请选择开仓类型（大分歧A / 大分歧B / 小分歧）"
    trade_style = trade_style_for_entry_model(entry_model)
    return trade_style, entry_model, None


def resolve_trade_record_entry_reason(
    *,
    entry_reason: Optional[str] = None,
    entry_model: Optional[str] = None,
    key_signal_type: Optional[str] = None,
    monitor_type: Optional[str] = None,
    entry_reason_from_key_signal=None,
    entry_reason_for_monitor_type=None,
) -> str:
    er = (entry_reason or "").strip()
    if er:
        return er
    label = entry_model_label(entry_model)
    if label:
        return label
    kst = (key_signal_type or "").strip()
    if kst and entry_reason_from_key_signal is not None:
        from_key = (entry_reason_from_key_signal(kst) or "").strip()
        if from_key:
            return from_key
    if entry_reason_for_monitor_type is not None:
        from_mt = (entry_reason_for_monitor_type(monitor_type) or "").strip()
        if from_mt:
            return from_mt
    return ""


def enrich_entry_model_display(item: dict) -> dict:
    code = normalize_entry_model_code(item.get("entry_model"))
    if code:
        item["entry_model"] = code
        item["entry_model_label"] = entry_model_label(code)
    else:
        item.setdefault("entry_model_label", "")
    return item


def order_entry_template_context(policy: TradePolicy) -> dict:
    profile = order_entry_profile(policy)
    opts = entry_model_options()
    return {
        "order_entry_profile": profile,
        "intraday_discipline": profile == PROFILE_INTRADAY,
        "entry_model_options": [
            {"code": o.code, "label": o.label, "trade_style": o.trade_style, "help": o.help}
            for o in opts
        ],
        "entry_model_trade_style_map": {o.code: o.trade_style for o in opts},
    }


def hub_meta_entry_context(policy: TradePolicy) -> dict:
    """供 /api/hub/meta：中控按 profile 隐藏平仓/委托等。"""
    profile = order_entry_profile(policy)
    return {
        "order_entry_profile": profile,
        "intraday_discipline": profile == PROFILE_INTRADAY,
    }


def migrate_entry_model_columns(conn) -> None:
    for table in ("order_monitors", "trade_records"):
        try:
            conn.execute(f"ALTER TABLE {table} ADD COLUMN entry_model TEXT")
        except Exception:
            pass