"""Daemon configuration resolution (REQ-005, REQ-010, REQ-012/013)."""
from __future__ import annotations

import os
from dataclasses import dataclass, replace
from typing import Optional


def _load_dotenv() -> None:
    """Best-effort load of a .env file into os.environ (REQ-010).

    Real OS environment variables take precedence over .env (override=False),
    matching 12-factor expectations. If python-dotenv is not installed or no
    .env exists, this is a no-op (no regression).
    """
    try:
        from dotenv import find_dotenv, load_dotenv
    except ImportError:  # pragma: no cover - optional at runtime
        return
    load_dotenv(find_dotenv(usecwd=True), override=False)


@dataclass(frozen=True)
class KISConfig:
    base_url: str
    app_key: str
    app_secret: str
    account_ref: str
    timeout: float
    allow_live: bool
    redis_url: str = ""   # REQ-016: optional token cache backend


@dataclass(frozen=True)
class PortfolioHubConfig:
    """portfolio-hub ledger adapter config (REQ-017)."""

    base_url: str
    token: str = ""
    timeout: float = 5.0


@dataclass(frozen=True)
class PaperBrokerConfig:
    """Paper broker tuning for e2e test scenarios (REQ-011).

    Defaults reproduce immediate, full fills with no rejects, so an unset
    environment is byte-for-byte the prior `PaperBroker()` behaviour.
    """

    fill_after_polls: int = 0
    qty_per_poll: Optional[int] = None
    reject_symbols: frozenset[str] = frozenset()


@dataclass(frozen=True)
class RabbitMQConfig:
    """RabbitMQ transport adapter config (REQ-022, dcy-006 OQ-6)."""

    url: str
    timeout: float = 5.0


@dataclass(frozen=True)
class SnapshotScheduleConfig:
    """Daily snapshot refresh schedule (REQ-030)."""

    kst_time: str = "07:30"
    tick_sec: float = 60.0


@dataclass(frozen=True)
class SafetySellConfig:
    """Safety-sell feature tuning (REQ-041 / BAT-010).

    All five env vars are parsed here even though only WATCHDOG_TIMEOUT and
    WATCHDOG_GRACE_PERIOD are consumed in BAT-010; the remaining three are
    used by BAT-011 trigger loops once they land.
    """

    watchdog_timeout_sec: int = 120
    watchdog_grace_period_sec: int = 60
    forced_close_check_interval_sec: int = 60
    stop_loss_poll_interval_sec: int = 30
    market_close_liquidation_time: Optional[str] = None  # "HH:MM" KST, optional
    # BAT-014 / REQ-053: persistent-rejection retry cooldown (dcy-010).
    min_retry_interval_sec: int = 600       # per-slot cooldown between sell retries
    max_retry_warn_count: int = 3           # WARNING after this many consecutive retries


@dataclass(frozen=True)
class DaemonInstanceConfig:
    """Per-instance TOML settings (REQ-048 / BAT-013).

    `instance_key` and `portfolio_hub_token` live in a TOML file (not .env)
    so they are not committed and so multiple instances can run distinct
    queues. Loaded via `--config <path>.toml`.
    """

    instance_key: str
    portfolio_hub_token: str = ""
    # dcy-014 / REQ-048: trading_date timezone + daily preallocation trigger.
    # Optional — absent keys fall back to KST / midnight defaults.
    trading_timezone: str = "Asia/Seoul"
    daily_preallocation_time: str = "00:00"

    @staticmethod
    def from_toml(path: str) -> "DaemonInstanceConfig":
        import tomllib

        with open(path, "rb") as fh:
            data = tomllib.load(fh)
        instance_key = data.get("instance_key")
        if not instance_key:
            raise RuntimeError(
                f"instance TOML missing required 'instance_key': {path}"
            )
        return DaemonInstanceConfig(
            instance_key=str(instance_key),
            portfolio_hub_token=str(data.get("portfolio_hub_token") or ""),
            trading_timezone=str(data.get("trading_timezone") or "Asia/Seoul"),
            daily_preallocation_time=str(data.get("daily_preallocation_time") or "00:00"),
        )


@dataclass(frozen=True)
class DaemonConfig:
    dsn: str
    total_slots: int
    broker: str                      # 'paper' | 'kis'
    execution_interval_sec: float
    # BAT-013 / REQ-049: instance identity for multi-instance queue naming.
    # "default" keeps legacy literal queue names (backward-compat).
    instance_key: str = "default"
    kis: Optional[KISConfig] = None
    # REQ-011: paper broker tuning (only consulted when broker == 'paper').
    paper: PaperBrokerConfig = PaperBrokerConfig()
    # REQ-017/019: ledger writer config (None => in-memory stub ledger,
    # appropriate for slice-1 paper-broker integration tests).
    portfolio_hub: Optional[PortfolioHubConfig] = None
    ledger_interval_sec: float = 1.0
    # REQ-022 (BAT-007): RabbitMQ transport config. Required by the new
    # sync+thread daemon — HTTP API has been removed (REQ-025).
    rabbitmq: Optional[RabbitMQConfig] = None
    # REQ-030 (BAT-008): daily snapshot refresh.
    snapshot_schedule: SnapshotScheduleConfig = SnapshotScheduleConfig()
    # REQ-041 (BAT-010): safety-sell feature config.
    safety_sell: SafetySellConfig = SafetySellConfig()
    # dcy-013 / REQ-014 (BAT-017): Alert-only pending-order stale watchdog
    # threshold in seconds. 0 disables (default). When >0, dispatched-pending
    # slots older than this are surfaced (WARN + counter) without state change.
    pending_stale_threshold_sec: int = 0
    # dcy-014 / REQ-005 (BAT-018): trading_date timezone (default KST) + daily
    # preallocation trigger time (HH:MM, TZ-local). Operative surface is the
    # per-instance TOML (REQ-048); these are the env-only defaults.
    trading_timezone: str = "Asia/Seoul"
    daily_preallocation_time: str = "00:00"

    @staticmethod
    def from_env() -> "DaemonConfig":
        _load_dotenv()
        dsn = os.environ.get("TREX_POSTGRESQL_DSN")
        if not dsn:
            raise RuntimeError(
                "TREX_POSTGRESQL_DSN is required to start the slot-core daemon."
            )
        broker = os.environ.get("TREX_BROKER", "paper").strip().lower()
        kis: Optional[KISConfig] = None
        if broker == "kis":
            kis = KISConfig(
                base_url=os.environ["TREX_KIS_BROKER_BASE_URL"],
                app_key=os.environ["TREX_KIS_BROKER_APP_KEY"],
                app_secret=os.environ["TREX_KIS_BROKER_APP_SECRET"],
                account_ref=os.environ["TREX_KIS_BROKER_ACCOUNT_REF"],
                timeout=float(os.environ.get("TREX_KIS_BROKER_TIMEOUT", "5")),
                allow_live=os.environ.get("TREX_KIS_ALLOW_LIVE", "").lower() in ("1", "true", "yes"),
                redis_url=os.environ.get("TREX_KIS_REDIS_URL", ""),
            )
        qpp_raw = os.environ.get("TREX_PAPER_QTY_PER_POLL", "").strip()
        reject_raw = os.environ.get("TREX_PAPER_REJECT_SYMBOLS", "")
        paper = PaperBrokerConfig(
            fill_after_polls=int(os.environ.get("TREX_PAPER_FILL_AFTER_POLLS", "0")),
            qty_per_poll=int(qpp_raw) if qpp_raw else None,
            reject_symbols=frozenset(
                s.strip() for s in reject_raw.split(",") if s.strip()
            ),
        )
        portfolio_hub: Optional[PortfolioHubConfig] = None
        pf_base = os.environ.get("TREX_PORTFOLIO_HUB_BASE_URL", "").strip()
        if pf_base:
            portfolio_hub = PortfolioHubConfig(
                base_url=pf_base,
                token=os.environ.get("TREX_PORTFOLIO_HUB_TOKEN", "").strip(),
                timeout=float(os.environ.get("TREX_PORTFOLIO_HUB_TIMEOUT", "5")),
            )
        rabbitmq: Optional[RabbitMQConfig] = None
        mq_url = os.environ.get("TREX_RABBITMQ_URL", "").strip()
        if mq_url:
            rabbitmq = RabbitMQConfig(
                url=mq_url,
                timeout=float(os.environ.get("TREX_RABBITMQ_TIMEOUT", "5")),
            )
        snapshot_schedule = SnapshotScheduleConfig(
            kst_time=os.environ.get("TREX_SNAPSHOT_SCHEDULE_KST", "07:30").strip() or "07:30",
            tick_sec=float(os.environ.get("TREX_SNAPSHOT_TICK_SEC", "60")),
        )
        _mc_time = os.environ.get("TREX_MARKET_CLOSE_LIQUIDATION_TIME", "").strip() or None
        safety_sell = SafetySellConfig(
            watchdog_timeout_sec=int(os.environ.get("TREX_WATCHDOG_TIMEOUT", "120")),
            watchdog_grace_period_sec=int(os.environ.get("TREX_WATCHDOG_GRACE_PERIOD", "60")),
            forced_close_check_interval_sec=int(
                os.environ.get("TREX_FORCED_CLOSE_CHECK_INTERVAL", "60")
            ),
            stop_loss_poll_interval_sec=int(
                os.environ.get("TREX_STOP_LOSS_POLL_INTERVAL", "30")
            ),
            market_close_liquidation_time=_mc_time,
            min_retry_interval_sec=int(
                os.environ.get("TREX_SAFETY_SELL_MIN_RETRY_INTERVAL", "600")
            ),
            max_retry_warn_count=int(
                os.environ.get("TREX_SAFETY_SELL_MAX_RETRY_WARN_COUNT", "3")
            ),
        )
        return DaemonConfig(
            dsn=dsn,
            total_slots=int(os.environ.get("TREX_TOTAL_SLOTS", "10")),
            broker=broker,
            execution_interval_sec=float(os.environ.get("TREX_EXECUTION_INTERVAL_SEC", "1.0")),
            kis=kis,
            paper=paper,
            portfolio_hub=portfolio_hub,
            ledger_interval_sec=float(os.environ.get("TREX_LEDGER_INTERVAL_SEC", "1.0")),
            rabbitmq=rabbitmq,
            snapshot_schedule=snapshot_schedule,
            safety_sell=safety_sell,
            pending_stale_threshold_sec=int(
                os.environ.get("TREX_PENDING_STALE_THRESHOLD", "0")
            ),
        )

    @staticmethod
    def from_config(toml_path: str) -> "DaemonConfig":
        """Build config from env + a per-instance TOML file (REQ-048 / BAT-013).

        `instance_key` and `portfolio_hub_token` come from TOML (not .env).
        TOML `portfolio_hub_token` overrides the (env-derived) PortfolioHubConfig
        token when a portfolio-hub base_url is configured.
        """
        base = DaemonConfig.from_env()
        inst = DaemonInstanceConfig.from_toml(toml_path)
        pf = base.portfolio_hub
        if inst.portfolio_hub_token and pf is not None:
            pf = replace(pf, token=inst.portfolio_hub_token)
        # dcy-014 / REQ-048: trading_date TZ + daily trigger come from TOML.
        return replace(
            base,
            instance_key=inst.instance_key,
            portfolio_hub=pf,
            trading_timezone=inst.trading_timezone,
            daily_preallocation_time=inst.daily_preallocation_time,
        )