"""开仓统一管道：定仓 → 兑 USDC → 资金门（fail-closed）。

策略自动开仓与手动开一组共用，避免双路径打架。
基线假设：运行中不在交易所人工开平仓、也不人工手动平仓。
"""

from __future__ import annotations

import logging
from dataclasses import dataclass
from typing import Any

from ..models.db import Database, get_db
from .open_capacity import assess_open_capacity, funds_gate_blocks
from .risk_sizing import apply_risk_sizing_to_ledger

logger = logging.getLogger(__name__)


@dataclass(slots=True)
class OpenPrepResult:
    ok: bool
    detail: str = ""
    capacity: dict[str, Any] | None = None
    sizing_detail: str = ""
    convert_detail: str = ""


def prepare_usdc_while_waiting(db: Database | None = None) -> dict[str, Any]:
    """空仓等待选约：预览名义检测 USDC 并兑换，不落库改写 qty/exit。"""
    from .auto_usdc import prepare_okx_trading_usdc

    return prepare_okx_trading_usdc(db)


def size_and_gate(
    *,
    index_px: float,
    option_ask: float,
    db: Database | None = None,
    call_ask: float | None = None,
    put_ask: float | None = None,
    hedge_mode: str | None = None,
) -> OpenPrepResult:
    """
    选约成功后：写入以损定仓 → 交易账户兑 USDC → 资金门。
    资金门 fail-closed：异常 / can_open 非 True 一律拦截。
    """
    database = db or get_db()
    mode = str(hedge_mode or "").strip().lower()
    if not mode:
        try:
            from ..config import get_settings
            from ..sim.ledger import Ledger

            s = get_settings()
            mode = str(
                Ledger(database).get_setting_str("hedge_mode", s.hedge_mode)
                or s.hedge_mode
            ).strip().lower()
        except Exception:
            mode = "perp_option"

    try:
        if mode == "option_option":
            from .risk_sizing import apply_oo_sizing_to_ledger

            if call_ask is None or put_ask is None:
                return OpenPrepResult(ok=False, detail="期期定仓缺少 call/put 卖一")
            rs = apply_oo_sizing_to_ledger(
                call_ask=float(call_ask),
                put_ask=float(put_ask),
                index_px=float(index_px),
                db=database,
            )
            if not rs.ok:
                return OpenPrepResult(ok=False, detail=rs.detail, sizing_detail=rs.detail)
        else:
            from ..sim.ledger import Ledger
            from .risk_sizing import is_risk_based
            from .semi_auto import is_semi_auto, read_semi_params

            led = Ledger(database)
            semi_perp = None
            semi_opt = None
            semi_exit = None
            semi_basis = None
            if is_semi_auto(led):
                sp = read_semi_params(led)
                semi_perp = float(sp["perp_unit"])
                semi_opt = float(sp["option_unit"])
                semi_exit = float(sp["perp_exit_unit"])
                # 半自动以损定仓：按盘口卖一推期权量，再按配比乘 k 得永续量
                semi_basis = "actual"
                if not is_risk_based(led):
                    # 手动仓：半自动直接写入 永续:期权 配比名义
                    database.set_setting("perp_qty_eth", f"{semi_perp:.4f}")
                    database.set_setting("option_qty_eth", f"{semi_opt:.4f}")
            rs = apply_risk_sizing_to_ledger(
                index_px=float(index_px),
                option_ask=float(option_ask),
                db=database,
                perp_unit=semi_perp,
                option_unit=semi_opt,
                exit_unit=semi_exit,
                leverage_basis=semi_basis,
            )
            if not rs.ok:
                return OpenPrepResult(ok=False, detail=rs.detail, sizing_detail=rs.detail)
    except Exception as e:
        logger.exception("risk sizing failed in open pipeline")
        return OpenPrepResult(ok=False, detail=f"以损定仓计算异常：{e}")

    convert_detail = ""
    try:
        from .auto_usdc import ensure_okx_trading_usdc

        # 选约后名义已更新；仍受冷却约束，禁止 force 砸单
        conv = ensure_okx_trading_usdc(
            database,
            cap=assess_open_capacity(
                database,
                option_ask=float(option_ask),
                call_ask=call_ask,
                put_ask=put_ask,
            ),
            force=False,
        )
        convert_detail = str(conv.get("detail") or "")
        if conv.get("acted"):
            logger.info("open_pipeline auto_usdc: %s", convert_detail)
    except Exception:
        logger.exception("auto USDC in open pipeline failed")
        convert_detail = "自动兑 USDC 异常（已记日志）"

    try:
        cap = assess_open_capacity(
            database,
            option_ask=float(option_ask),
            call_ask=call_ask,
            put_ask=put_ask,
        )
    except Exception as e:
        logger.exception("open capacity assess failed")
        return OpenPrepResult(
            ok=False,
            detail=f"资金可开判定失败，拒绝开仓：{e}",
            convert_detail=convert_detail,
        )

    blocked, why = funds_gate_blocks(cap)
    if blocked:
        return OpenPrepResult(
            ok=False,
            detail=why or "资金不足或状态未知，拒绝开仓",
            capacity=cap,
            convert_detail=convert_detail,
        )
    return OpenPrepResult(
        ok=True,
        detail="ready",
        capacity=cap,
        convert_detail=convert_detail,
    )