"""Intent admission RPC handler + dedup tests (REQ-021/022/023, dcy-006).

The handler calls IntentService.submit_*, so dedup uses the IntentStore
(intent_log) gate (REQ-007). Two messages with the same correlation_id
trigger exactly ONE slot transition (REQ-023 AC-1).
"""
from __future__ import annotations

from datetime import date


from trex_core.adapters.persistence.in_memory_intent_store import InMemoryIntentStore
from trex_core.application.intents import IntentService
from trex_core.application.messaging import RpcRequest
from trex_core.application.messaging_handlers import make_intent_rpc_handler
from trex_core.domain.slot import SlotService, SlotState
from trex_core.domain.slot.in_memory_repository import InMemorySlotRepository

DAY = date(2026, 6, 5)


def _wire():
    repo = InMemorySlotRepository()
    svc = SlotService(repo)
    intents = IntentService(svc, repo, InMemoryIntentStore())
    svc.preallocate_daily_slots(DAY, 3)
    return repo, svc, intents


def _buy_req(intent_id: str, symbol: str = "005930") -> RpcRequest:
    return RpcRequest(
        payload={
            "intent_type": "buy",
            "intent_id": intent_id,
            "trading_date": DAY.isoformat(),
            "symbol": symbol,
            "qty": 10,
        },
        correlation_id=intent_id,
    )


def test_buy_admission_returns_admitted_and_transitions_slot():
    repo, _, intents = _wire()
    handler = make_intent_rpc_handler(intents)
    resp = handler(_buy_req("buy-1"))
    assert resp.payload["status"] == "admitted"
    assert resp.payload["slot_id"]
    from uuid import UUID
    slot = repo.fetch_slot(UUID(resp.payload["slot_id"]))
    assert slot.status is SlotState.PENDING_BUY and slot.symbol == "005930"


def test_duplicate_correlation_id_dedups_via_intent_log():
    """REQ-023 AC-1: same intent_id ⇒ slot transition exactly once."""
    repo, _, intents = _wire()
    handler = make_intent_rpc_handler(intents)
    r1 = handler(_buy_req("buy-dup"))
    r2 = handler(_buy_req("buy-dup"))
    assert r1.payload == r2.payload
    pending = [s for s in repo.list_slots(DAY) if s.status is SlotState.PENDING_BUY]
    assert len(pending) == 1


def test_buy_rejected_when_no_idle_slot():
    repo, _, intents = _wire()
    handler = make_intent_rpc_handler(intents)
    for i in range(3):
        assert handler(_buy_req(f"buy-{i}")).payload["status"] == "admitted"
    resp = handler(_buy_req("overflow"))
    assert resp.payload["status"] == "rejected"
    assert resp.payload["reason"] == "no_idle_slot"


def test_sell_admission_from_holding():
    repo, svc, intents = _wire()
    handler = make_intent_rpc_handler(intents)
    sid = handler(_buy_req("buy-h")).payload["slot_id"]
    from uuid import UUID
    svc.transit_slot(UUID(sid), SlotState.PENDING_BUY, SlotState.HOLDING,
                     reason="filled", actor="t")
    resp = handler(RpcRequest(
        payload={"intent_type": "sell", "intent_id": "sell-h", "slot_id": sid},
        correlation_id="sell-h",
    ))
    assert resp.payload["status"] == "admitted"
    assert repo.fetch_slot(UUID(sid)).status is SlotState.PENDING_SELL


def test_bad_payload_returns_rejected_not_exception():
    """Handler must not raise — bad input ⇒ structured rejection."""
    _, _, intents = _wire()
    handler = make_intent_rpc_handler(intents)
    # missing slot_id for sell
    resp = handler(RpcRequest(
        payload={"intent_type": "sell", "intent_id": "bad"},
        correlation_id="bad",
    ))
    assert resp.payload["status"] == "rejected"
    assert resp.payload["reason"].startswith("bad_request:")


def test_unknown_intent_type_rejected():
    _, _, intents = _wire()
    handler = make_intent_rpc_handler(intents)
    resp = handler(RpcRequest(
        payload={"intent_type": "ping", "intent_id": "x"},
        correlation_id="x",
    ))
    assert resp.payload["status"] == "rejected"
    assert "unknown_intent_type" in resp.payload["reason"]


def test_correlation_id_is_used_as_intent_id_when_missing_in_payload():
    """The transport's correlation_id is the canonical idempotency key."""
    repo, _, intents = _wire()
    handler = make_intent_rpc_handler(intents)
    req = RpcRequest(
        payload={
            "intent_type": "buy",
            "trading_date": DAY.isoformat(),
            "symbol": "005930",
            "qty": 5,
        },
        correlation_id="cid-only",
    )
    r1 = handler(req)
    r2 = handler(req)
    assert r1.payload["status"] == "admitted"
    assert r1.payload == r2.payload
    pending = [s for s in repo.list_slots(DAY) if s.status is SlotState.PENDING_BUY]
    assert len(pending) == 1