from __future__ import annotations

from functools import lru_cache

from pydantic_settings import BaseSettings, SettingsConfigDict


class Settings(BaseSettings):
    model_config = SettingsConfigDict(
        env_file=(".env", "../.env"),
        env_file_encoding="utf-8",
        extra="ignore",
    )

    mode: str = "SIM"
    tz: str = "Asia/Shanghai"
    env_name: str = "test"  # test / prod
    exchange: str = "okx"  # okx | binance（币安占位）

    api_host: str = "0.0.0.0"
    api_port: int = 5155

    # Web 登录（仅本机 .env，勿提交真密码）
    auth_username: str = "admin"
    auth_password: str = "admin123"
    auth_secret: str = "change-me-eth-hedge-sim-secret"
    auth_token_ttl_sec: int = 60 * 60 * 24 * 7

    okx_api_key: str = ""
    okx_api_secret: str = ""
    okx_api_passphrase: str = ""
    okx_rest_base: str = "https://www.okx.com"
    okx_ws_public: str = "wss://ws.okx.com:8443/ws/v5/public"
    okx_http_proxy: str = ""

    perp_inst_id: str = "ETH-USDT-SWAP"
    option_inst_family: str = "ETH-USD_UM"
    index_inst_id: str = "ETH-USD"

    fee_rate: float = 0.0005
    initial_equity: float = 100_000.0
    max_rounds: int = 3  # 已不再强管控，仅兼容旧字段
    open_hhmm: str = "16:00"  # 已废弃开仓窗
    stop_open_hhmm: str = "08:00"  # 已废弃开仓窗
    exit_move_points: float = 30.0  # 旧字段，改用 exit_move_pct
    exit_move_pct: float = 2.0  # 相对开仓指数波动 % 全平
    rest_seconds: int = 300
    leverage: float = 3.0  # 永续杠杆
    min_option_hours: float = 12.0  # 期权最小剩余小时
    min_option_leverage: float = 100.0  # 现价/卖一权利金 下限
    perp_qty_eth: float = 1.0
    option_qty_eth: float = 2.0
    option_ct_mult_default: float = 0.01
    db_path: str = ""  # empty -> backend/data/hedge.db

    @property
    def is_sim(self) -> bool:
        return self.mode.strip().upper() != "LIVE"


@lru_cache
def get_settings() -> Settings:
    return Settings()