"""Operator command bus consumer (plan 007).

The dashboard / qabot emit ``operator_command`` events (a guarded kill switch);
the live loop polls this consumer on its 5s guard cadence and executes each new
command through the execution service's existing protective-close helpers, then
echoes an ``operator_command_done`` event so a restart never re-runs it.

Replay safety (three layers):
  1. an in-session consumed-nonce set (deduped within the process),
  2. persisted ``operator_command_done`` events reloaded on boot (deduped across
     restarts),
  3. a staleness window — commands older than ``stale_seconds`` are ignored, so a
     command issued while the loop was down does not fire on the next boot.

Deliberately minimal: a closed command vocabulary (OPERATOR_COMMANDS), no
parameters beyond an optional symbol. flatten_all routes through
``close_session`` DIRECTLY (never ``step_eod_flatten``) so it can never trip
plan 003's daily-restart exit.
"""

from __future__ import annotations

import json
import logging
from datetime import datetime, timedelta

from storage.event_schema import EventMode, OperatorCommandEvent, EventType

logger = logging.getLogger(__name__)

STALE_SECONDS = 600  # ignore commands older than 10 minutes (boot-replay guard)


class OperatorCommandConsumer:
    def __init__(self, store, execution, *, session_id=None, now_fn=None,
                 stale_seconds: float = STALE_SECONDS, mode: EventMode = EventMode.PAPER):
        self.store = store
        self.execution = execution
        self.session_id = session_id
        self._now = now_fn or datetime.now
        self._stale = float(stale_seconds)
        self._mode = mode
        # nonces already handled — seeded from persisted _done events so a restart
        # doesn't re-execute a command the previous process already ran.
        self._consumed: set[str] = self._load_done_nonces()

    def _cutoff_iso(self) -> str:
        return (self._now() - timedelta(seconds=self._stale)).isoformat()

    def _load_done_nonces(self) -> set[str]:
        done: set[str] = set()
        try:
            for e in self.store.query_events(
                event_type=EventType.OPERATOR_COMMAND_DONE.value,
                since=self._cutoff_iso(), limit=None,
            ):
                nonce = json.loads(e.get("payload_json") or "{}").get("nonce")
                if nonce:
                    done.add(str(nonce))
        except Exception:  # noqa: BLE001 — a rebuild failure must not block boot
            logger.warning("operator-command done-nonce reload skipped", exc_info=True)
        return done

    def poll(self) -> list[str]:
        """Execute any new, in-window operator commands. Returns nonces executed."""
        try:
            events = self.store.query_events(
                event_type=EventType.OPERATOR_COMMAND.value,
                since=self._cutoff_iso(), limit=None,
            )
        except Exception:  # noqa: BLE001
            logger.warning("operator-command poll failed", exc_info=True)
            return []
        executed: list[str] = []
        for e in events:
            p = json.loads(e.get("payload_json") or "{}")
            nonce = str(p.get("nonce") or "")
            if not nonce or nonce in self._consumed:
                continue
            self._consumed.add(nonce)  # mark BEFORE executing so a raising command can't loop
            result = self._execute(p)
            self._emit_done(p, result)
            executed.append(nonce)
            logger.info("operator command %s (%s) -> %s",
                        p.get("command"), p.get("symbol") or "-", result)
        return executed

    def _execute(self, p: dict) -> str:
        cmd = p.get("command")
        sym = p.get("symbol")
        ex = self.execution
        if ex is None:
            return "error: no execution service"
        try:
            if cmd == "flatten_all":
                # DIRECT close_session — never step_eod_flatten, so this cannot
                # request plan 003's daily-restart exit. close_session also blocks
                # re-entry for the session (the kill-switch semantic).
                res = ex.close_session("operator_flatten")
                errs = res.get("errors") if isinstance(res, dict) else None
                closed = ", ".join(res.get("closed_positions") or []) if isinstance(res, dict) else ""
                return f"error: {errs}" if errs else f"ok: flattened [{closed or 'none'}]"
            if cmd == "flatten_symbol":
                if not sym:
                    return "error: flatten_symbol requires a symbol"
                res = ex.flatten_symbol(sym)
                return "ok" if res.get("ok") else f"error: {res.get('error')}"
            if cmd == "pause_entries":
                ex.set_operator_paused(True)
                return "ok: entries paused"
            if cmd == "resume_entries":
                ex.set_operator_paused(False)
                return "ok: entries resumed"
            return f"error: unknown command {cmd!r}"
        except Exception as exc:  # noqa: BLE001 — one bad command must not kill the loop
            logger.warning("operator command %s failed", cmd, exc_info=True)
            return f"error: {exc}"

    def _emit_done(self, p: dict, result: str) -> None:
        try:
            self.store.emit(OperatorCommandEvent(
                timestamp=self._now(), mode=self._mode, correlation_id=self.session_id,
                event_type=EventType.OPERATOR_COMMAND_DONE,
                message=f"operator command {p.get('command')} done: {result}",
                command=str(p.get("command") or ""), symbol=p.get("symbol"),
                requested_by=str(p.get("requested_by") or "operator"),
                nonce=str(p.get("nonce") or ""), result=result,
            ))
        except Exception:  # noqa: BLE001
            logger.warning("operator-command done-echo emit failed", exc_info=True)