"""Position reconciliation between portfolio-hub and broker (REQ-031).

The broker account is single (invariant B) so portfolio-hub quantities are
aggregated to `symbol` before being compared with `BrokerPort.get_balance()`.
Mismatches flip the asset's `warning` overlay; a subsequent successful match
clears it automatically (in-memory only — pause is the durable channel for
manual holds).
"""
from __future__ import annotations

import logging
from typing import Optional

from trex_core.application.alarm_emitter import AlarmEmitter
from trex_core.application.broker_port import BrokerPort
from trex_core.application.portfolio import SnapshotStore
from trex_core.domain.slot.state import SlotState

_log = logging.getLogger(__name__)


def reconcile_core_holdings(
    *,
    slot_repo,
    slot_service,
    broker: BrokerPort,
    instance_key: str,
    alarm_emitter: Optional[AlarmEmitter] = None,
) -> dict[str, str]:
    """dcy-020 / REQ-062 (BAT-029): surface core-slot holding ↔ broker divergence.

    Broker balance is the reconcile ground truth. Decisions (no silent auto-fix,
    no auto-liquidation — issue #15):
    - A. core holding but broker flat (qty 0)  -> slot to `error` + WARN (operator resolve)
    - C. both hold but qty differs             -> WARN (mirror is non-authoritative)
    - B. broker holds, no core holding slot    -> WARN (unmanaged position)
    Returns {key: 'error'|'qty_warning'|'ok'|'unmanaged_warning'} for telemetry.
    (Liquidation qty = broker authoritative in execution dispatch is BAT-δ.)"""
    broker_qty: dict[str, int] = {
        item.symbol: int(item.hldg_qty) for item in broker.get_balance()
    }
    decisions: dict[str, str] = {}
    matched: set[str] = set()
    for slot in slot_repo.list_holding_slots(instance_key):
        sym = slot.symbol
        matched.add(sym)
        bq = broker_qty.get(sym, 0)
        if bq == 0:  # A — phantom holding
            try:
                slot_service.transit_slot(
                    slot.slot_id, SlotState.HOLDING, SlotState.ERROR,
                    reason="reconcile_mismatch:broker_flat", actor="reconcile",
                )
                decisions[str(slot.slot_id)] = "error"
                _log.warning(
                    "core holding but broker flat: slot=%s symbol=%s -> error",
                    slot.slot_id, sym,
                )
                # dcy-033 / REQ-100: CRITICAL alarm — position mismatch.
                if alarm_emitter is not None:
                    alarm_emitter.publish_alarm(
                        "core_holding_broker_flat",
                        f"슬롯 보유인데 브로커 잔고 0 (slot={slot.slot_id} symbol={sym})",
                        fields={"slot_id": str(slot.slot_id), "symbol": sym},
                    )
            except Exception:  # noqa: BLE001 - never let reconcile crash the loop
                _log.exception("failed to error-quarantine slot %s", slot.slot_id)
        elif slot.qty is not None and int(slot.qty) != bq:  # C — qty mismatch
            decisions[str(slot.slot_id)] = "qty_warning"
            _log.warning(
                "qty mismatch: slot=%s symbol=%s core=%s broker=%d (mirror non-authoritative)",
                slot.slot_id, sym, slot.qty, bq,
            )
        else:
            decisions[str(slot.slot_id)] = "ok"
    for sym, bq in broker_qty.items():  # B — unmanaged broker position
        if bq > 0 and sym not in matched:
            decisions[f"broker:{sym}"] = "unmanaged_warning"
            _log.warning(
                "broker holds %s qty=%d with no core holding slot (unmanaged position)",
                sym, bq,
            )
    return decisions


def reconcile_positions(*, store: SnapshotStore, broker: BrokerPort) -> dict[str, str]:
    """Run one reconciliation pass.

    Returns a `{portfolio_id: 'warning' | 'cleared' | 'ok'}` map for telemetry.
    The map is also reflected onto `store` via `set_warning(...)`.
    """
    broker_qty: dict[str, int] = {
        item.symbol: int(item.hldg_qty) for item in broker.get_balance()
    }

    # Group portfolio-hub quantities by symbol so we can compare to broker's
    # per-symbol aggregate.
    by_symbol: dict[str, list[tuple[str, float]]] = {}
    assets = store.list_assets()
    for a in assets:
        sym = a.item.symbol
        by_symbol.setdefault(sym, []).append((a.item.portfolio_id, a.item.asset_quantity))

    decisions: dict[str, str] = {}
    for symbol, entries in by_symbol.items():
        hub_total = int(sum(qty for _, qty in entries))
        broker_total = broker_qty.get(symbol, 0)
        match = hub_total == broker_total
        for pid, _ in entries:
            asset = store.get(pid)
            was_warned = bool(asset and asset.warning)
            if not match:
                if not was_warned:
                    _log.warning(
                        "position warning raised: portfolio_id=%s symbol=%s "
                        "hub=%d broker=%d", pid, symbol, hub_total, broker_total,
                    )
                store.set_warning(pid, True)
                decisions[pid] = "warning"
            else:
                if was_warned:
                    store.set_warning(pid, False)
                    decisions[pid] = "cleared"
                else:
                    decisions[pid] = "ok"
    return decisions