import asyncio
from typing import Any

import httpx
import pytest

from app.adapters.delivery_providers.cdek.client import (
    CDEKClient,
    CDEKClientError,
    CDEKProvider,
    CDEKRequestError,
)
from app import config as config_module
from app.config import AdapterConfig, Settings
from app.schemas.request import DeliveryEntity, DeliveryRequest


class StubAuthClient:
    async def get_access_token(self) -> str:
        return "test-token"


class SequenceHTTPClient:
    def __init__(self, results: list[Any]) -> None:
        self._results = results
        self.calls: list[dict[str, Any]] = []

    def _next_result(self) -> Any:
        return self._results[len(self.calls) - 1]

    async def post(
        self,
        url: str,
        *,
        json: dict[str, Any] | None = None,
        data: dict[str, Any] | None = None,
        headers: dict[str, str] | None = None,
        timeout: float | None = None,
    ) -> httpx.Response:
        self.calls.append(
            {
                "method": "POST",
                "url": url,
                "json": json,
                "data": data,
                "params": None,
                "headers": headers,
                "timeout": timeout,
            }
        )
        result = self._next_result()
        if isinstance(result, Exception):
            raise result
        return result

    async def get(
        self,
        url: str,
        *,
        params: dict[str, Any] | None = None,
        headers: dict[str, str] | None = None,
        timeout: float | None = None,
    ) -> httpx.Response:
        self.calls.append(
            {
                "method": "GET",
                "url": url,
                "json": None,
                "data": None,
                "params": params,
                "headers": headers,
                "timeout": timeout,
            }
        )
        result = self._next_result()
        if isinstance(result, Exception):
            raise result
        return result


class RecordingHTTPClient:
    def __init__(self) -> None:
        self.auth_timeouts: list[float | None] = []
        self.city_lookup_timeouts: list[float | None] = []
        self.tariff_timeouts: list[float | None] = []

    async def get(
        self,
        url: str,
        *,
        params: dict[str, Any] | None = None,
        headers: dict[str, str] | None = None,
        timeout: float | None = None,
    ) -> httpx.Response:
        request = httpx.Request("GET", url, params=params)
        self.city_lookup_timeouts.append(timeout)
        assert headers == {"Authorization": "Bearer provider-token"}
        city = params.get("name") if params else None
        code_by_city = {"Moscow": 44, "Kazan": 424}
        return httpx.Response(
            200,
            json={"code": code_by_city.get(city, 44), "full_name": city},
            request=request,
        )

    async def post(
        self,
        url: str,
        *,
        json: dict[str, Any] | None = None,
        data: dict[str, Any] | None = None,
        headers: dict[str, str] | None = None,
        timeout: float | None = None,
    ) -> httpx.Response:
        request = httpx.Request("POST", url)
        if url.endswith("/oauth/token"):
            self.auth_timeouts.append(timeout)
            return httpx.Response(
                200,
                json={"access_token": "provider-token", "expires_in": 3600},
                request=request,
            )
        self.tariff_timeouts.append(timeout)
        assert headers == {"Authorization": "Bearer provider-token"}
        assert data is None
        assert json is not None
        return httpx.Response(
            200,
            json={
                "tariff_codes": [
                    {
                        "tariff_name": "Express",
                        "delivery_sum": "899.00",
                        "currency": "RUB",
                        "period_min": 1,
                        "period_max": 2,
                    }
                ]
            },
            request=request,
        )


def _make_request(**overrides: object) -> DeliveryRequest:
    payload: dict[str, object] = {
        "entity": DeliveryEntity.INDIVIDUAL,
        "from_city": "Moscow",
        "to_city": "Kazan",
        "country_code": None,
        "weight_kg": 1.2,
        "length_cm": 20,
        "width_cm": 10,
        "height_cm": 5,
    }
    payload.update(overrides)
    return DeliveryRequest(**payload)


def test_cdek_client_retries_timeout_and_applies_timeout_seconds() -> None:
    request = _make_request()
    city_lookup_moscow = httpx.Response(
        200,
        json={"code": 44, "full_name": "Moscow"},
        request=httpx.Request("GET", "https://api.cdek.test/v2/location/suggest/cities"),
    )
    city_lookup_kazan = httpx.Response(
        200,
        json={"code": 424, "full_name": "Kazan"},
        request=httpx.Request("GET", "https://api.cdek.test/v2/location/suggest/cities"),
    )
    first_error = httpx.ReadTimeout(
        "read timeout",
        request=httpx.Request("POST", "https://api.cdek.test/v2/calculator/tarifflist"),
    )
    second_response = httpx.Response(
        200,
        json={"tariff_codes": [{"delivery_sum": 500}]},
        request=httpx.Request("POST", "https://api.cdek.test/v2/calculator/tarifflist"),
    )
    http_client = SequenceHTTPClient(
        [city_lookup_moscow, city_lookup_kazan, first_error, second_response]
    )
    sleep_calls: list[float] = []

    async def fake_sleep(seconds: float) -> None:
        sleep_calls.append(seconds)

    client = CDEKClient(
        http_client=http_client,  # type: ignore[arg-type]
        auth_client=StubAuthClient(),  # type: ignore[arg-type]
        base_url="https://api.cdek.test/v2",
        timeout_seconds=10.0,
        retry_attempts=1,
        retry_backoff_seconds=0.5,
        sleep=fake_sleep,
    )

    result = asyncio.run(client.get_raw_price(request))

    assert result == {"tariff_codes": [{"delivery_sum": 500}]}
    assert len(http_client.calls) == 4
    assert http_client.calls[0]["method"] == "GET"
    assert http_client.calls[0]["params"] == {
        "name": "Moscow",
    }
    assert http_client.calls[1]["method"] == "GET"
    assert http_client.calls[2]["method"] == "POST"
    assert http_client.calls[2]["json"]["from_location"] == {"code": 44}
    assert http_client.calls[2]["json"]["to_location"] == {"code": 424}
    assert http_client.calls[2]["timeout"] == 10.0
    assert sleep_calls == [0.5]


def test_cdek_client_passes_country_code_when_provided() -> None:
    request = _make_request(country_code="KZ")
    city_lookup_from = httpx.Response(
        200,
        json={"code": 88, "full_name": "Moscow"},
        request=httpx.Request("GET", "https://api.cdek.test/v2/location/suggest/cities"),
    )
    city_lookup_to = httpx.Response(
        200,
        json={"code": 99, "full_name": "Kazan"},
        request=httpx.Request("GET", "https://api.cdek.test/v2/location/suggest/cities"),
    )
    tariff_response = httpx.Response(
        200,
        json={"tariff_codes": [{"delivery_sum": 500}]},
        request=httpx.Request("POST", "https://api.cdek.test/v2/calculator/tarifflist"),
    )
    http_client = SequenceHTTPClient([city_lookup_from, city_lookup_to, tariff_response])
    client = CDEKClient(
        http_client=http_client,  # type: ignore[arg-type]
        auth_client=StubAuthClient(),  # type: ignore[arg-type]
        base_url="https://api.cdek.test/v2",
        retry_attempts=0,
    )

    asyncio.run(client.get_raw_price(request))

    assert http_client.calls[0]["params"] == {
        "name": "Moscow",
        "country_code": "KZ",
    }


def test_cdek_client_raises_on_non_retriable_http_error() -> None:
    request = _make_request()
    city_lookup_moscow = httpx.Response(
        200,
        json={"code": 44, "full_name": "Moscow"},
        request=httpx.Request("GET", "https://api.cdek.test/v2/location/suggest/cities"),
    )
    city_lookup_kazan = httpx.Response(
        200,
        json={"code": 424, "full_name": "Kazan"},
        request=httpx.Request("GET", "https://api.cdek.test/v2/location/suggest/cities"),
    )
    bad_response = httpx.Response(
        400,
        json={"error": "bad request"},
        request=httpx.Request("POST", "https://api.cdek.test/v2/calculator/tarifflist"),
    )
    http_client = SequenceHTTPClient([city_lookup_moscow, city_lookup_kazan, bad_response])
    client = CDEKClient(
        http_client=http_client,  # type: ignore[arg-type]
        auth_client=StubAuthClient(),  # type: ignore[arg-type]
        base_url="https://api.cdek.test/v2",
        retry_attempts=3,
    )

    with pytest.raises(CDEKClientError):
        asyncio.run(client.get_raw_price(request))

    assert len(http_client.calls) == 3


def test_cdek_client_raises_when_city_code_not_found() -> None:
    request = _make_request()
    city_lookup_empty = httpx.Response(
        200,
        json=[],
        request=httpx.Request("GET", "https://api.cdek.test/v2/location/suggest/cities"),
    )
    http_client = SequenceHTTPClient([city_lookup_empty])
    client = CDEKClient(
        http_client=http_client,  # type: ignore[arg-type]
        auth_client=StubAuthClient(),  # type: ignore[arg-type]
        base_url="https://api.cdek.test/v2",
        retry_attempts=0,
    )

    with pytest.raises(CDEKRequestError, match="no matches"):
        asyncio.run(client.get_raw_price(request))


def test_provider_uses_adapter_yaml_config_for_timeout_and_cache_ttl(
    tmp_path, monkeypatch
) -> None:
    config_file = tmp_path / "config.yaml"
    config_file.write_text(
        """
controller:
  api_prefix: "/api/v1"
  request_id_header: "X-Request-ID"

service:
  provider_timeout_seconds: 10.0
  max_parallel_providers: 8

business_logic:
  weight_round_scale: 2
  provider_price_multiplier: 1.0

repository:
  redis_dsn: "redis://localhost:6379/0"
  price_cache_ttl_seconds: 900

adapter:
  cdek_base_url: "https://api.cdek.test/v2"
  cdek_client_id: "yaml-id"
  cdek_client_secret: "yaml-secret"
  cdek_retry_attempts: 0
  cdek_retry_backoff_seconds: 0.1
  cdek_timeout_seconds: 7.5
  cdek_cache_ttl_seconds: 777

observability:
  enabled: false
  service_name: "cdek-adapter-test-service"
  otlp_endpoint: "http://collector:4317"
  otlp_insecure: true
""".strip(),
        encoding="utf-8",
    )
    monkeypatch.setattr(config_module, "_resolve_runtime_config_file", lambda: str(config_file))
    settings = Settings()
    http_client = RecordingHTTPClient()
    provider = CDEKProvider.from_adapter_config(
        http_client=http_client,  # type: ignore[arg-type]
        adapter_config=settings.adapter,
    )

    result = asyncio.run(provider.get_price(_make_request()))

    assert provider.cache_ttl_seconds == 777
    assert http_client.auth_timeouts == [7.5]
    assert http_client.city_lookup_timeouts == [7.5, 7.5]
    assert http_client.tariff_timeouts == [7.5]
    assert result.provider == "cdek"


def test_provider_uses_default_adapter_timeout_and_cache_ttl() -> None:
    adapter_config = AdapterConfig(
        cdek_client_id="default-id",
        cdek_client_secret="default-secret",
    )
    http_client = RecordingHTTPClient()
    provider = CDEKProvider.from_adapter_config(
        http_client=http_client,  # type: ignore[arg-type]
        adapter_config=adapter_config,
    )

    asyncio.run(provider.get_price(_make_request()))

    assert provider.cache_ttl_seconds == 900
    assert http_client.auth_timeouts == [10.0]
    assert http_client.city_lookup_timeouts == [10.0, 10.0]
    assert http_client.tariff_timeouts == [10.0]