import asyncio
from dataclasses import dataclass, field
from typing import Any

import pytest

from app.adapters.delivery_providers.cdek.order_mapper import (
    CDEKOrderRegistrationResult,
)
from app.adapters.tbank.base import TBankPaymentNotificationTokenError
from app.schemas.payment import InitPaymentRequest, TBankPaymentNotification
from app.services.aggregator import (
    AggregatorService,
    InvalidTBankPaymentNotificationError,
    TBankPaymentNotificationProcessingError,
)
from tests.payment_fixtures import make_init_payment_payload


def _default_payload() -> dict[str, Any]:
    return make_init_payment_payload()


@dataclass
class StoredOrder:
    order_uuid: str = "order-uuid-1"
    payment_url: str = "https://pay.test/payment/1"
    price: int = 125000
    tariff_code: str = "535"
    provider: str = "cdek"
    account_email: str = "client@example.com"
    payload: dict[str, Any] = field(default_factory=_default_payload)
    payment_status: str | None = None
    tbank_payment_id: int | None = None
    cdek_order_uuid: str | None = None
    cse_order_number: str | None = None
    cdek_waybill_uuid: str | None = None
    cdek_waybill_url: str | None = None
    payment_email_sent_at: object | None = None


class StubPaymentAdapter:
    def __init__(self, *, verify_error: Exception | None = None) -> None:
        self._verify_error = verify_error
        self.notifications: list[TBankPaymentNotification] = []

    async def create_payment_link(self, order_uuid: str, amount_kopecks: int) -> str:
        raise NotImplementedError

    def verify_payment_notification(
        self,
        notification: TBankPaymentNotification,
    ) -> None:
        self.notifications.append(notification)
        if self._verify_error is not None:
            raise self._verify_error


class StubOrderSessionContext:
    def __init__(self, session: object) -> None:
        self._session = session

    async def __aenter__(self) -> object:
        return self._session

    async def __aexit__(self, exc_type, exc, traceback) -> None:
        return None


class StubOrderRepository:
    def __init__(
        self,
        *,
        orders: list[StoredOrder] | None = None,
        mark_cdek_errors: list[Exception | None] | None = None,
    ) -> None:
        self._orders = {order.order_uuid: order for order in orders or []}
        self._mark_cdek_errors = mark_cdek_errors or []
        self.session_value = object()
        self.calls: list[tuple[str, tuple[object, ...]]] = []

    def session(self) -> StubOrderSessionContext:
        self.calls.append(("session", ()))
        return StubOrderSessionContext(self.session_value)

    async def create_order(self, session: object, order_data: object) -> object:
        raise NotImplementedError

    async def get_order_by_order_uuid(
        self,
        session: object,
        order_uuid: str,
        *,
        for_update: bool = False,
    ) -> StoredOrder | None:
        self.calls.append(("get_order_by_order_uuid", (session, order_uuid)))
        return self._orders.get(order_uuid)

    async def mark_payment_status(
        self,
        session: object,
        order_uuid: str,
        status: str,
        payment_id: int,
    ) -> StoredOrder | None:
        self.calls.append(
            ("mark_payment_status", (session, order_uuid, status, payment_id))
        )
        order = self._orders.get(order_uuid)
        if order is None:
            return None
        order.payment_status = status
        order.tbank_payment_id = payment_id
        return order

    async def mark_cdek_order_registered(
        self,
        session: object,
        order_uuid: str,
        cdek_order_uuid: str,
    ) -> StoredOrder | None:
        self.calls.append(
            ("mark_cdek_order_registered", (session, order_uuid, cdek_order_uuid))
        )
        if self._mark_cdek_errors:
            error = self._mark_cdek_errors.pop(0)
            if error is not None:
                raise error

        order = self._orders.get(order_uuid)
        if order is None:
            return None
        order.cdek_order_uuid = cdek_order_uuid
        return order

    async def record_payment_email_sent(
        self,
        session: object,
        *,
        order_uuid: str,
        sent_at: object,
    ) -> StoredOrder | None:
        self.calls.append(
            ("record_payment_email_sent", (session, order_uuid, sent_at))
        )
        order = self._orders.get(order_uuid)
        if order is not None and order.payment_email_sent_at is None:
            order.payment_email_sent_at = sent_at
        return order


class StubEmailSender:
    def __init__(self, *, error: Exception | None = None) -> None:
        self._error = error
        self.calls: list[dict[str, str]] = []

    async def send_email(
        self, *, to: str, subject: str, body: str
    ) -> None:
        self.calls.append({"to": to, "subject": subject, "body": body})
        if self._error is not None:
            raise self._error


class StubCDEKOrderAdapter:
    def __init__(
        self,
        *,
        responses: list[CDEKOrderRegistrationResult] | None = None,
        error: Exception | None = None,
    ) -> None:
        self._responses = responses or [
            CDEKOrderRegistrationResult(
                order_uuid="cdek-order-uuid-1",
                waybill_uuid=None,
                waybill_url=None,
            )
        ]
        self._error = error
        self.calls: list[tuple[InitPaymentRequest, str]] = []

    async def register_order(
        self, request: InitPaymentRequest, order_uuid: str
    ) -> CDEKOrderRegistrationResult:
        self.calls.append((request, order_uuid))
        if self._error is not None:
            raise self._error
        return self._responses.pop(0)


def _make_notification(**overrides: object) -> TBankPaymentNotification:
    payload: dict[str, object] = {
        "TerminalKey": "TestTerminal",
        "OrderId": "order-uuid-1",
        "Success": True,
        "Status": "CONFIRMED",
        "PaymentId": 8347568144,
        "ErrorCode": "0",
        "Amount": 125000,
        "Token": "signed-token",
    }
    payload.update(overrides)
    return TBankPaymentNotification(**payload)


def test_confirmed_notification_registers_cdek_order_and_saves_uuid() -> None:
    order = StoredOrder()
    payment_adapter = StubPaymentAdapter()
    order_repository = StubOrderRepository(orders=[order])
    cdek_adapter = StubCDEKOrderAdapter(
        responses=[
            CDEKOrderRegistrationResult(
                order_uuid="cdek-order-uuid-1",
                waybill_uuid="waybill-uuid-1",
                waybill_url="https://cdek.test/waybill/1.pdf",
            )
        ]
    )
    service = AggregatorService(
        providers=[],
        payment_adapter=payment_adapter,
        order_repository=order_repository,
        order_registration_adapters={"cdek": cdek_adapter},
    )
    notification = _make_notification()

    result = asyncio.run(service.handle_tbank_payment_notification(notification))

    assert result == "OK"
    assert payment_adapter.notifications == [notification]
    assert order.payment_status == "CONFIRMED"
    assert order.tbank_payment_id == 8347568144
    assert order.cdek_order_uuid == "cdek-order-uuid-1"
    assert order.cdek_waybill_uuid is None
    assert order.cdek_waybill_url is None
    assert len(cdek_adapter.calls) == 1
    assert cdek_adapter.calls[0][1] == "order-uuid-1"


def test_duplicate_confirmed_notification_does_not_call_cdek() -> None:
    order = StoredOrder(cdek_order_uuid="existing-cdek-order-uuid")
    cdek_adapter = StubCDEKOrderAdapter()
    service = AggregatorService(
        providers=[],
        payment_adapter=StubPaymentAdapter(),
        order_repository=StubOrderRepository(orders=[order]),
        order_registration_adapters={"cdek": cdek_adapter},
    )

    result = asyncio.run(
        service.handle_tbank_payment_notification(_make_notification())
    )

    assert result == "OK"
    assert cdek_adapter.calls == []
    assert order.cdek_order_uuid == "existing-cdek-order-uuid"


def test_non_confirmed_notification_acknowledges_without_cdek() -> None:
    order = StoredOrder()
    cdek_adapter = StubCDEKOrderAdapter()
    service = AggregatorService(
        providers=[],
        payment_adapter=StubPaymentAdapter(),
        order_repository=StubOrderRepository(orders=[order]),
        order_registration_adapters={"cdek": cdek_adapter},
    )

    result = asyncio.run(
        service.handle_tbank_payment_notification(
            _make_notification(Status="AUTHORIZED")
        )
    )

    assert result == "OK"
    assert order.payment_status == "AUTHORIZED"
    assert cdek_adapter.calls == []


def test_invalid_token_does_not_access_repository_or_cdek() -> None:
    order_repository = StubOrderRepository(orders=[StoredOrder()])
    cdek_adapter = StubCDEKOrderAdapter()
    service = AggregatorService(
        providers=[],
        payment_adapter=StubPaymentAdapter(
            verify_error=TBankPaymentNotificationTokenError("bad token")
        ),
        order_repository=order_repository,
        order_registration_adapters={"cdek": cdek_adapter},
    )

    with pytest.raises(InvalidTBankPaymentNotificationError):
        asyncio.run(service.handle_tbank_payment_notification(_make_notification()))

    assert order_repository.calls == []
    assert cdek_adapter.calls == []


def test_missing_order_returns_processing_error_without_cdek() -> None:
    cdek_adapter = StubCDEKOrderAdapter()
    service = AggregatorService(
        providers=[],
        payment_adapter=StubPaymentAdapter(),
        order_repository=StubOrderRepository(),
        order_registration_adapters={"cdek": cdek_adapter},
    )

    with pytest.raises(TBankPaymentNotificationProcessingError):
        asyncio.run(service.handle_tbank_payment_notification(_make_notification()))

    assert cdek_adapter.calls == []


def test_cdek_registration_failure_returns_processing_error() -> None:
    cdek_adapter = StubCDEKOrderAdapter(error=RuntimeError("cdek down"))
    service = AggregatorService(
        providers=[],
        payment_adapter=StubPaymentAdapter(),
        order_repository=StubOrderRepository(orders=[StoredOrder()]),
        order_registration_adapters={"cdek": cdek_adapter},
    )

    with pytest.raises(TBankPaymentNotificationProcessingError):
        asyncio.run(service.handle_tbank_payment_notification(_make_notification()))

    assert len(cdek_adapter.calls) == 1


def test_repeated_confirmed_after_cdek_uuid_save_failure_uses_same_external_id() -> None:
    order = StoredOrder()
    order_repository = StubOrderRepository(
        orders=[order],
        mark_cdek_errors=[RuntimeError("db down"), None],
    )
    cdek_adapter = StubCDEKOrderAdapter(
        responses=[
            CDEKOrderRegistrationResult(
                order_uuid="same-cdek-order-uuid",
                waybill_uuid=None,
                waybill_url=None,
            ),
            CDEKOrderRegistrationResult(
                order_uuid="same-cdek-order-uuid",
                waybill_uuid=None,
                waybill_url=None,
            ),
        ]
    )
    service = AggregatorService(
        providers=[],
        payment_adapter=StubPaymentAdapter(),
        order_repository=order_repository,
        order_registration_adapters={"cdek": cdek_adapter},
    )
    notification = _make_notification()

    with pytest.raises(TBankPaymentNotificationProcessingError):
        asyncio.run(service.handle_tbank_payment_notification(notification))

    assert order.cdek_order_uuid is None

    result = asyncio.run(service.handle_tbank_payment_notification(notification))

    assert result == "OK"
    assert order.cdek_order_uuid == "same-cdek-order-uuid"
    assert [order_uuid for _, order_uuid in cdek_adapter.calls] == [
        "order-uuid-1",
        "order-uuid-1",
    ]


def test_confirmed_notification_sends_payment_confirmation_email() -> None:
    order = StoredOrder()
    email_sender = StubEmailSender()
    service = AggregatorService(
        providers=[],
        payment_adapter=StubPaymentAdapter(),
        order_repository=StubOrderRepository(orders=[order]),
        order_registration_adapters={"cdek": StubCDEKOrderAdapter()},
        email_sender=email_sender,
    )

    result = asyncio.run(
        service.handle_tbank_payment_notification(_make_notification())
    )

    assert result == "OK"
    assert len(email_sender.calls) == 1
    assert email_sender.calls[0]["to"] == "client@example.com"
    assert "order-uuid-1" in email_sender.calls[0]["subject"]
    assert order.payment_email_sent_at is not None


def test_non_confirmed_notification_does_not_send_email() -> None:
    order = StoredOrder()
    email_sender = StubEmailSender()
    service = AggregatorService(
        providers=[],
        payment_adapter=StubPaymentAdapter(),
        order_repository=StubOrderRepository(orders=[order]),
        order_registration_adapters={"cdek": StubCDEKOrderAdapter()},
        email_sender=email_sender,
    )

    result = asyncio.run(
        service.handle_tbank_payment_notification(
            _make_notification(Status="AUTHORIZED")
        )
    )

    assert result == "OK"
    assert email_sender.calls == []
    assert order.payment_email_sent_at is None


def test_duplicate_notification_does_not_resend_payment_email() -> None:
    from datetime import datetime, timezone

    order = StoredOrder(
        cdek_order_uuid="existing-cdek-order-uuid",
        payment_email_sent_at=datetime(2026, 1, 1, tzinfo=timezone.utc),
    )
    email_sender = StubEmailSender()
    service = AggregatorService(
        providers=[],
        payment_adapter=StubPaymentAdapter(),
        order_repository=StubOrderRepository(orders=[order]),
        order_registration_adapters={"cdek": StubCDEKOrderAdapter()},
        email_sender=email_sender,
    )

    result = asyncio.run(
        service.handle_tbank_payment_notification(_make_notification())
    )

    assert result == "OK"
    assert email_sender.calls == []


def test_email_failure_does_not_break_notification_handling() -> None:
    order = StoredOrder()
    email_sender = StubEmailSender(error=RuntimeError("smtp down"))
    service = AggregatorService(
        providers=[],
        payment_adapter=StubPaymentAdapter(),
        order_repository=StubOrderRepository(orders=[order]),
        order_registration_adapters={"cdek": StubCDEKOrderAdapter()},
        email_sender=email_sender,
    )

    result = asyncio.run(
        service.handle_tbank_payment_notification(_make_notification())
    )

    assert result == "OK"
    assert len(email_sender.calls) == 1
    assert order.cdek_order_uuid == "cdek-order-uuid-1"