"""CDEK HTTP client and provider adapter."""

import asyncio
from collections.abc import Awaitable, Callable
from typing import Any

import httpx
import structlog

from app.adapters.delivery_providers.base import (
    DeliveryProvider,
    ProviderClientError,
    ProviderRequestError,
)
from app.adapters.delivery_providers.cdek.auth import CDEKAuthClient
from app.adapters.delivery_providers.cdek.mapper import (
    CDEKMappingError,
    map_cdek_response,
    map_cdek_response_for_tariff_code,
)
from app.adapters.delivery_providers.cdek.order_mapper import (
    CDEKOrderInfo,
    CDEKOrderMappingError,
    CDEKOrderRegistrationResult,
    CDEKWaybillInfo,
    centimeters_string_to_int,
    kilograms_string_to_grams,
    map_cdek_existing_order_response,
    map_cdek_order_info_response,
    map_cdek_order_request,
    map_cdek_order_response,
    map_cdek_waybill_info_response,
    resolve_cdek_city_code,
)
from app.cities import cities_map
from app.config import CDEKDeliveryProviderConfig
from app.schemas.payment import InitPaymentRequest
from app.schemas.request import DeliveryCalculationRequest
from app.schemas.response import DeliveryPrice
log = structlog.get_logger(__name__)


class CDEKClientError(ProviderClientError):
    """Raised when CDEK tariff request fails."""


class CDEKRequestError(CDEKClientError, ProviderRequestError):
    """Raised when CDEK rejects request data as invalid."""


class CDEKClient:
    def __init__(
        self,
        http_client: httpx.AsyncClient,
        auth_client: CDEKAuthClient,
        *,
        base_url: str,
        timeout_seconds: float = 10.0,
        retry_attempts: int = 2,
        retry_backoff_seconds: float = 0.2,
        sleep: Callable[[float], Awaitable[None]] = asyncio.sleep,
    ) -> None:
        self._http_client = http_client
        self._auth_client = auth_client
        normalized_base_url = base_url.rstrip("/")
        self._tariff_url = f"{normalized_base_url}/calculator/tarifflist"
        self._orders_url = f"{normalized_base_url}/orders"
        self._print_orders_url = f"{normalized_base_url}/print/orders"
        self._timeout_seconds = timeout_seconds
        self._retry_attempts = retry_attempts
        self._retry_backoff_seconds = retry_backoff_seconds
        self._sleep = sleep

    async def get_raw_price(
        self, request: DeliveryCalculationRequest
    ) -> dict[str, Any]:
        payload = await self._build_payload(request)
        return await self._post_tariff_payload(
            payload,
            request_error_message=None,
        )

    async def get_raw_payment_price(
        self,
        request: InitPaymentRequest,
    ) -> dict[str, Any]:
        payload = self._build_payment_price_payload(request)
        return await self._post_tariff_payload(
            payload,
            request_error_message=(
                "CDEK payment price validation request was rejected with status"
            ),
        )

    async def _post_tariff_payload(
        self,
        payload: dict[str, Any],
        *,
        request_error_message: str | None,
    ) -> dict[str, Any]:
        for attempt in range(self._retry_attempts + 1):
            try:
                token = await self._auth_client.get_access_token()
                response = await self._http_client.post(
                    self._tariff_url,
                    json=payload,
                    headers={"Authorization": f"Bearer {token}"},
                    timeout=self._timeout_seconds,
                )
            except (httpx.TimeoutException, httpx.TransportError) as exc:
                if attempt < self._retry_attempts:
                    await self._sleep(self._retry_delay(attempt))
                    continue
                raise CDEKClientError(
                    "CDEK tariff request failed after retry attempts."
                ) from exc

            if self._should_retry(response.status_code):
                if attempt < self._retry_attempts:
                    await self._sleep(self._retry_delay(attempt))
                    continue
                log.warning(
                    "cdek_tariff_request_server_error",
                    status_code=response.status_code,
                    response_body=_response_text_or_none(response),
                    request_payload=payload,
                )
                raise CDEKClientError(
                    f"CDEK tariff request failed with status {response.status_code}."
                )

            if request_error_message is not None and 400 <= response.status_code < 500:
                log.warning(
                    "cdek_tariff_request_rejected",
                    status_code=response.status_code,
                    response_body=_response_text_or_none(response),
                    request_payload=payload,
                )
                raise CDEKRequestError(
                    f"{request_error_message} {response.status_code}."
                )

            try:
                response.raise_for_status()
                raw_payload = response.json()
            except (httpx.HTTPError, TypeError, ValueError) as exc:
                raise CDEKClientError("CDEK tariff request returned invalid payload.") from exc

            if not isinstance(raw_payload, dict):
                raise CDEKClientError("CDEK tariff payload must be a JSON object.")
            return raw_payload

        raise CDEKClientError("CDEK tariff request failed unexpectedly.")

    async def register_order(
        self, request: InitPaymentRequest, order_uuid: str
    ) -> CDEKOrderRegistrationResult:
        payload = map_cdek_order_request(request, order_uuid)
        for attempt in range(self._retry_attempts + 1):
            try:
                token = await self._auth_client.get_access_token()
                response = await self._http_client.post(
                    self._orders_url,
                    json=payload,
                    headers={"Authorization": f"Bearer {token}"},
                    timeout=self._timeout_seconds,
                )
            except (httpx.TimeoutException, httpx.TransportError) as exc:
                if attempt < self._retry_attempts:
                    await self._sleep(self._retry_delay(attempt))
                    continue
                raise CDEKClientError(
                    "CDEK order registration failed after retry attempts."
                ) from exc

            if self._should_retry(response.status_code):
                if attempt < self._retry_attempts:
                    await self._sleep(self._retry_delay(attempt))
                    continue
                raise CDEKClientError(
                    "CDEK order registration failed with retriable status "
                    f"{response.status_code}."
                )

            if 400 <= response.status_code < 500:
                response_payload = _response_json_or_none(response)
                existing_result = map_cdek_existing_order_response(response_payload)
                if existing_result is not None:
                    return existing_result
                log.warning(
                    "cdek_order_register_rejected",
                    status_code=response.status_code,
                    request_payload=payload,
                    response_payload=response_payload,
                    response_body=_response_text_or_none(response),
                )
                raise CDEKRequestError(
                    "CDEK order registration request was rejected with status "
                    f"{response.status_code}."
                )

            try:
                response.raise_for_status()
                raw_payload = response.json()
            except (httpx.HTTPError, TypeError, ValueError) as exc:
                raise CDEKClientError(
                    "CDEK order registration returned invalid payload."
                ) from exc

            if not isinstance(raw_payload, dict):
                raise CDEKClientError(
                    "CDEK order registration payload must be a JSON object."
                )

            log.info(
                "cdek_order_register_raw_response",
                status_code=response.status_code,
                response_payload=raw_payload,
            )

            try:
                return map_cdek_order_response(raw_payload)
            except CDEKOrderMappingError as exc:
                raise CDEKClientError(
                    "CDEK order registration response payload is invalid."
                ) from exc

        raise CDEKClientError("CDEK order registration failed unexpectedly.")

    async def get_order(self, cdek_order_uuid: str) -> CDEKOrderInfo:
        url = f"{self._orders_url}/{cdek_order_uuid}"
        raw_payload = await self._get_json(
            url,
            failure_message="CDEK get order failed",
        )
        requests_with_errors = _extract_requests_with_errors(raw_payload)
        if requests_with_errors:
            log.warning(
                "cdek_order_request_errors",
                cdek_order_uuid=cdek_order_uuid,
                requests=requests_with_errors,
            )
        try:
            return map_cdek_order_info_response(raw_payload)
        except CDEKOrderMappingError as exc:
            raise CDEKClientError(
                "CDEK get order response payload is invalid."
            ) from exc

    async def get_waybill(self, cdek_waybill_uuid: str) -> CDEKWaybillInfo:
        url = f"{self._print_orders_url}/{cdek_waybill_uuid}"
        raw_payload = await self._get_json(
            url,
            failure_message="CDEK get waybill failed",
        )
        try:
            return map_cdek_waybill_info_response(raw_payload)
        except CDEKOrderMappingError as exc:
            raise CDEKClientError(
                "CDEK get waybill response payload is invalid."
            ) from exc

    async def download_waybill_pdf(self, url: str) -> bytes:
        failure_message = "CDEK waybill PDF download failed"
        for attempt in range(self._retry_attempts + 1):
            try:
                token = await self._auth_client.get_access_token()
                response = await self._http_client.get(
                    url,
                    headers={"Authorization": f"Bearer {token}"},
                    timeout=self._timeout_seconds,
                )
            except (httpx.TimeoutException, httpx.TransportError) as exc:
                if attempt < self._retry_attempts:
                    await self._sleep(self._retry_delay(attempt))
                    continue
                raise CDEKClientError(
                    f"{failure_message} after retry attempts."
                ) from exc

            if self._should_retry(response.status_code):
                if attempt < self._retry_attempts:
                    await self._sleep(self._retry_delay(attempt))
                    continue
                raise CDEKClientError(
                    f"{failure_message} with retriable status "
                    f"{response.status_code}."
                )

            if 400 <= response.status_code < 500:
                log.warning(
                    "cdek_waybill_pdf_download_rejected",
                    url=url,
                    status_code=response.status_code,
                    response_body=_response_text_or_none(response),
                )
                raise CDEKRequestError(
                    f"{failure_message} with status {response.status_code}."
                )

            try:
                response.raise_for_status()
            except httpx.HTTPError as exc:
                raise CDEKClientError(
                    f"{failure_message}: invalid response."
                ) from exc

            return response.content

        raise CDEKClientError(f"{failure_message} unexpectedly.")

    async def _get_json(self, url: str, *, failure_message: str) -> dict[str, Any]:
        for attempt in range(self._retry_attempts + 1):
            try:
                token = await self._auth_client.get_access_token()
                response = await self._http_client.get(
                    url,
                    headers={"Authorization": f"Bearer {token}"},
                    timeout=self._timeout_seconds,
                )
            except (httpx.TimeoutException, httpx.TransportError) as exc:
                if attempt < self._retry_attempts:
                    await self._sleep(self._retry_delay(attempt))
                    continue
                raise CDEKClientError(
                    f"{failure_message} after retry attempts."
                ) from exc

            if self._should_retry(response.status_code):
                if attempt < self._retry_attempts:
                    await self._sleep(self._retry_delay(attempt))
                    continue
                raise CDEKClientError(
                    f"{failure_message} with retriable status "
                    f"{response.status_code}."
                )

            if 400 <= response.status_code < 500:
                log.warning(
                    "cdek_get_request_rejected",
                    url=url,
                    status_code=response.status_code,
                    response_body=_response_text_or_none(response),
                )
                raise CDEKRequestError(
                    f"{failure_message} with status {response.status_code}."
                )

            try:
                response.raise_for_status()
                raw_payload = response.json()
            except (httpx.HTTPError, TypeError, ValueError) as exc:
                raise CDEKClientError(
                    f"{failure_message}: invalid response payload."
                ) from exc

            if not isinstance(raw_payload, dict):
                raise CDEKClientError(
                    f"{failure_message}: payload must be a JSON object."
                )
            return raw_payload

        raise CDEKClientError(f"{failure_message} unexpectedly.")

    def _retry_delay(self, attempt: int) -> float:
        return self._retry_backoff_seconds * (attempt + 1)

    @staticmethod
    def _should_retry(status_code: int) -> bool:
        return status_code == 429 or status_code >= 500

    async def _build_payload(
        self, request: DeliveryCalculationRequest
    ) -> dict[str, Any]:
        from_city_code = self._get_cdek_city_code(request.from_city)
        to_city_code = self._get_cdek_city_code(request.to_city)
        return {
            "type": 2,
            "from_location": {"code": from_city_code},
            "to_location": {"code": to_city_code},
            "packages": [
                {
                    "weight": int(round(request.weight_kg * 1000)),
                    "length": int(round(request.length_cm)),
                    "width": int(round(request.width_cm)),
                    "height": int(round(request.height_cm)),
                }
            ],
        }

    @staticmethod
    def _build_payment_price_payload(
        request: InitPaymentRequest,
    ) -> dict[str, Any]:
        try:
            from_code = resolve_cdek_city_code(request.sender_address.city_id)
            to_code = resolve_cdek_city_code(request.receiver_address.city_id)
            weight_grams = kilograms_string_to_grams(request.system_data.weight)
        except CDEKOrderMappingError as exc:
            raise CDEKRequestError(str(exc)) from exc

        package: dict[str, Any] = {"weight": weight_grams}
        dimensions = request.system_data.dimensions
        if request.system_data.parcel_type == "parcel" and dimensions is not None:
            try:
                package["length"] = centimeters_string_to_int(dimensions.length, "length")
                package["width"] = centimeters_string_to_int(dimensions.width, "width")
                package["height"] = centimeters_string_to_int(dimensions.height, "height")
            except CDEKOrderMappingError as exc:
                raise CDEKRequestError(str(exc)) from exc

        return {
            "type": 2,
            "from_location": {"code": from_code},
            "to_location": {"code": to_code},
            "packages": [package],
        }

    @staticmethod
    def _get_cdek_city_code(city_id: int) -> int:
        city_entry = cities_map.get(str(city_id))
        if not isinstance(city_entry, dict):
            raise CDEKRequestError(
                f"CDEK city mapping is not configured for city id {city_id}."
            )

        cdek_data = city_entry.get("cdek")
        if not isinstance(cdek_data, dict):
            raise CDEKRequestError(
                f"CDEK city mapping is not configured for city id {city_id}."
            )

        raw_city_code = cdek_data.get("code")
        if raw_city_code is None or isinstance(raw_city_code, bool):
            raise CDEKRequestError(
                f"CDEK city code is invalid for city id {city_id}."
            )

        try:
            return int(raw_city_code)
        except (TypeError, ValueError) as exc:
            raise CDEKRequestError(
                f"CDEK city code is invalid for city id {city_id}."
            ) from exc


class CDEKProvider(DeliveryProvider):
    name = "cdek"

    def __init__(self, client: CDEKClient, *, cache_ttl_seconds: int = 900) -> None:
        self._client = client
        self.cache_ttl_seconds = cache_ttl_seconds

    @classmethod
    def from_config(
        cls,
        *,
        http_client: httpx.AsyncClient,
        config: CDEKDeliveryProviderConfig,
    ) -> "CDEKProvider":
        auth_client = CDEKAuthClient(
            http_client=http_client,
            base_url=config.base_url,
            client_id=config.client_id,
            client_secret=config.client_secret,
            timeout_seconds=config.timeout_seconds,
        )
        client = CDEKClient(
            http_client=http_client,
            auth_client=auth_client,
            base_url=config.base_url,
            timeout_seconds=config.timeout_seconds,
            retry_attempts=config.retry_attempts,
            retry_backoff_seconds=config.retry_backoff_seconds,
        )
        return cls(client=client, cache_ttl_seconds=config.cache_ttl_seconds)

    async def get_prices(
        self, request: DeliveryCalculationRequest
    ) -> list[DeliveryPrice]:
        raw_payload = await self._client.get_raw_price(request)
        return map_cdek_response(raw_payload)

    async def get_payment_price(
        self,
        request: InitPaymentRequest,
    ) -> DeliveryPrice | None:
        raw_payload = await self._client.get_raw_payment_price(request)
        try:
            return map_cdek_response_for_tariff_code(
                raw_payload,
                tariff_code=request.system_data.tariff.tariff_code,
            )
        except CDEKMappingError as exc:
            raise CDEKClientError(
                "CDEK payment price validation response payload is invalid."
            ) from exc

    async def register_order(
        self, request: InitPaymentRequest, order_uuid: str
    ) -> CDEKOrderRegistrationResult:
        return await self._client.register_order(request, order_uuid)

    async def get_order(self, cdek_order_uuid: str) -> CDEKOrderInfo:
        return await self._client.get_order(cdek_order_uuid)

    async def get_waybill(self, cdek_waybill_uuid: str) -> CDEKWaybillInfo:
        return await self._client.get_waybill(cdek_waybill_uuid)


def _response_json_or_none(response: httpx.Response) -> object | None:
    try:
        return response.json()
    except (TypeError, ValueError):
        return None


def _response_text_or_none(response: httpx.Response) -> str | None:
    try:
        return response.text
    except Exception:
        return None


def _extract_requests_with_errors(
    payload: dict[str, Any],
) -> list[dict[str, object]]:
    requests = payload.get("requests")
    if not isinstance(requests, list):
        return []

    requests_with_errors: list[dict[str, object]] = []
    for request in requests:
        if not isinstance(request, dict):
            continue
        errors = request.get("errors")
        if not isinstance(errors, list) or not errors:
            continue
        requests_with_errors.append(
            {
                "request_uuid": request.get("request_uuid"),
                "type": request.get("type"),
                "state": request.get("state"),
                "errors": errors,
            }
        )
    return requests_with_errors