"""Юнит-тесты сервиса заказов. Без БД и без сети — сессия подменяется заглушкой."""

from __future__ import annotations

import asyncio
from datetime import UTC, datetime
from typing import Any

import pytest

from app.db.models.order import Order
from app.schemas.orders import OrderUpdateIn
from app.services.orders import OrderEditError, _parse_crm_datetime, _to_kopecks, update_order


class TestToKopecks:
    def test_converts_decimal_string_to_kopecks(self) -> None:
        assert _to_kopecks("599.00") == 59900

    def test_handles_fractional_kopecks(self) -> None:
        assert _to_kopecks("12.34") == 1234

    def test_handles_integer_without_fraction(self) -> None:
        assert _to_kopecks("100") == 10000

    def test_handles_zero(self) -> None:
        assert _to_kopecks("0.00") == 0


class TestParseCrmDatetime:
    def test_parses_crm_format(self) -> None:
        assert _parse_crm_datetime("2026-09-20 10:00:00") == datetime(2026, 9, 20, 10, 0, 0)


class _FakeSession:
    def __init__(self, order: Order | None) -> None:
        self.order = order

    async def scalar(self, query: Any) -> Order | None:
        return self.order


def _order(**overrides: Any) -> Order:
    fields: dict[str, Any] = {
        "id": "1",
        "recipient_name": "Тест",
        "recipient_phone": "0501112233",
        "recipient_email": None,
        "waybill_number": "20450000000001",
        "notes": None,
        "total_amount_kopecks": 120000,
        "goods": [],
        "is_deleted": False,
        "receipt_created_at": None,
        "edited_at": None,
        "np_status": "Прибув",
        "np_status_code": "7",
        "np_cod_amount_kopecks": 120000,
        "np_payment_status": "NeedPayment",
    }
    fields.update(overrides)
    return Order(**fields)


_GOOD = {
    "id": "1",
    "sku": "A",
    "name": "Товар",
    "price": "600.00",
    "quantity": "2",
    "discount_amount": "50.00",
}


def _payload(**overrides: Any) -> OrderUpdateIn:
    data: dict[str, Any] = {
        "recipient_name": "Тест",
        "recipient_phone": "0501112233",
        "recipient_email": "",
        "waybill_number": "20450000000001",
        "notes": "",
        "total_amount": "1100.00",
        "goods": [_GOOD],
    }
    data.update(overrides)
    return OrderUpdateIn.model_validate(data)


def _update(order: Order | None, payload: OrderUpdateIn) -> tuple[Order, list[str]]:
    result = asyncio.run(update_order(_FakeSession(order), "1", payload))  # type: ignore[arg-type]
    assert result is not None
    return result


class TestUpdateOrder:
    def test_recomputes_line_amount_and_marks_edited(self) -> None:
        order, changed = _update(_order(), _payload())

        assert order.goods[0]["amount"] == "1150.00"
        assert order.goods[0]["quantity"] == "2.000"
        assert order.total_amount_kopecks == 110000
        assert order.edited_at is not None
        assert set(changed) == {"goods", "total_amount"}

    def test_blank_strings_become_null(self) -> None:
        order, _ = _update(_order(), _payload(notes="  "))

        assert order.notes is None
        assert order.recipient_email is None

    def test_new_line_gets_generated_id(self) -> None:
        good = {"sku": "", "name": "Новый", "price": "10.00", "quantity": "1"}
        order, _ = _update(_order(), _payload(goods=[good], total_amount="10.00"))

        assert order.goods[0]["id"].startswith("new-")

    def test_waybill_change_resets_np_tracking(self) -> None:
        order, changed = _update(_order(), _payload(waybill_number="20450000000002"))

        assert "waybill_number" in changed
        assert order.np_status is None
        assert order.np_cod_amount_kopecks is None

    def test_no_changes_does_not_mark_edited(self) -> None:
        # Снимок в формате CRM ("2", а не "2.000") — формат строк не считается правкой.
        stored = {**_GOOD, "discount_percent": "4.17", "amount": "1150.00"}
        order, changed = _update(_order(goods=[stored], total_amount_kopecks=110000), _payload())

        assert changed == []
        assert order.edited_at is None
        assert order.goods == [stored]

    def test_total_above_goods_sum_is_rejected(self) -> None:
        with pytest.raises(OrderEditError, match="больше суммы товаров"):
            _update(_order(), _payload(total_amount="1200.00"))

    def test_discount_above_line_sum_is_rejected(self) -> None:
        good = {"name": "Товар", "price": "10.00", "quantity": "1", "discount_amount": "11"}
        with pytest.raises(OrderEditError, match="скидка больше"):
            _update(_order(), _payload(goods=[good], total_amount="0"))

    def test_order_with_receipt_is_locked(self) -> None:
        with pytest.raises(OrderEditError, match="уже создан чек"):
            _update(_order(receipt_created_at=datetime.now(UTC)), _payload())

    def test_missing_or_deleted_order_returns_none(self) -> None:
        payload = _payload()
        assert asyncio.run(update_order(_FakeSession(None), "1", payload)) is None  # type: ignore[arg-type]
        deleted = _FakeSession(_order(is_deleted=True))
        assert asyncio.run(update_order(deleted, "1", payload)) is None  # type: ignore[arg-type]