003 Add cdek

app/adapters/delivery_providers/cdek/mapper.py

@@ -1,8 +1,51 @@
-"""CDEK response mapper skeleton."""
+"""CDEK response mapper to unified delivery schema."""
+
+from decimal import Decimal
+from typing import Any
 
 from app.schemas.response import DeliveryPrice
 
 
-def map_cdek_response(payload: dict) -> DeliveryPrice:
-    _ = payload
-    raise NotImplementedError("CDEK mapper implementation is added in task 003.")
+class CDEKMappingError(ValueError):
+    """Raised when CDEK response cannot be mapped."""
+
+
+def map_cdek_response(payload: dict[str, Any]) -> DeliveryPrice:
+    tariff = _get_first_tariff(payload)
+
+    service_name = tariff.get("tariff_name") or tariff.get("tariff_code")
+    if service_name is None:
+        raise CDEKMappingError("CDEK tariff_name is missing.")
+
+    raw_price = tariff.get("delivery_sum")
+    if raw_price is None:
+        raise CDEKMappingError("CDEK delivery_sum is missing.")
+
+    period_min = tariff.get("period_min")
+    if period_min is None:
+        raise CDEKMappingError("CDEK period_min is missing.")
+    period_max = tariff.get("period_max", period_min)
+
+    raw_currency = tariff.get("currency") or payload.get("currency") or "RUB"
+
+    try:
+        return DeliveryPrice(
+            provider="cdek",
+            service_name=str(service_name),
+            price=Decimal(str(raw_price)),
+            currency=str(raw_currency).upper(),
+            delivery_days_min=int(period_min),
+            delivery_days_max=int(period_max),
+        )
+    except (ArithmeticError, TypeError, ValueError) as exc:
+        raise CDEKMappingError("CDEK response fields have invalid values.") from exc
+
+
+def _get_first_tariff(payload: dict[str, Any]) -> dict[str, Any]:
+    tariff_codes = payload.get("tariff_codes")
+    if not isinstance(tariff_codes, list) or not tariff_codes:
+        raise CDEKMappingError("CDEK response must include non-empty tariff_codes.")
+    tariff = tariff_codes[0]
+    if not isinstance(tariff, dict):
+        raise CDEKMappingError("CDEK tariff entry must be an object.")
+    return tariff