refactor: migrate api_client.py prints to structured logging

Replace all print() calls with logger.info/logger.error using
lazy % formatting. Add test verifying error path emits ERROR log.

U2 of P2-001 (replace print with logging)

api_client.py

@@ -1,4 +1,5 @@
 # api_client.py (complete updated version)
+import logging
 import requests
 import json
 import re
@@ -8,6 +9,8 @@ from config import config
 import time
 from collections import defaultdict
 
+logger = logging.getLogger(__name__)
+
 
 class TweedeKamerAPI:
     def __init__(self):
@@ -42,18 +45,18 @@ class TweedeKamerAPI:
             voting_records, besluit_meta = self._get_voting_records(
                 start_date, end_date, limit
             )
-            print(f"Fetched {len(voting_records)} voting records from API")
+            logger.info("Fetched %d voting records from API", len(voting_records))
 
             # Group by Besluit_Id (decision/motion) and get motion details
             motions = self._process_voting_records(
                 voting_records, besluit_meta, skip_details=skip_details
             )
-            print(f"Processed into {len(motions)} unique motions")
+            logger.info("Processed into %d unique motions", len(motions))
 
             return motions
 
         except Exception as e:
-            print(f"Error fetching motions from API: {e}")
+            logger.error("Error fetching motions from API: %s", e)
             return []
 
     def _get_voting_records(
@@ -132,16 +135,18 @@ class TweedeKamerAPI:
                     break  # last page
                 skip += page_size
 
-            print(
-                f"Retrieved {len(all_records)} voting records from {len(besluit_meta)} decisions"
+            logger.info(
+                "Retrieved %d voting records from %d decisions",
+                len(all_records),
+                len(besluit_meta),
             )
             return all_records, besluit_meta
 
         except requests.exceptions.RequestException as e:
-            print(f"API request failed: {e}")
+            logger.error("API request failed: %s", e)
             if hasattr(e, "response") and e.response is not None:
-                print(f"Response status: {e.response.status_code}")
-                print(f"Response text: {e.response.text[:500]}")
+                logger.error("Response status: %d", e.response.status_code)
+                logger.error("Response text: %s", e.response.text[:500])
             return all_records, besluit_meta  # return whatever we got before failure
 
     def _process_voting_records(
@@ -336,7 +341,7 @@ class TweedeKamerAPI:
             }
 
         except Exception as e:
-            print(f"Error getting motion details for {besluit_id}: {e}")
+            logger.error("Error getting motion details for %s: %s", besluit_id, e)
 
         return None
 
@@ -359,7 +364,7 @@ class TweedeKamerAPI:
                     if ext_id:
                         return ext_id
         except Exception as e:
-            print(f"Error fetching ExterneIdentifier for zaak {zaak_id}: {e}")
+            logger.error("Error fetching ExterneIdentifier for zaak %s: %s", zaak_id, e)
 
         return None
 
@@ -412,7 +417,7 @@ class TweedeKamerAPI:
             return body if len(body) > 50 else None
 
         except Exception as e:
-            print(f"Error fetching body text for {externe_identifier}: {e}")
+            logger.error("Error fetching body text for %s: %s", externe_identifier, e)
 
         return None
 
@@ -494,5 +499,5 @@ class TweedeKamerAPI:
             return len(data.get("value", [])) > 0
 
         except Exception as e:
-            print(f"API connection test failed: {e}")
+            logger.error("API connection test failed: %s", e)
             return False

tests/test_api_client.py

@@ -0,0 +1,19 @@
+import logging
+from unittest.mock import patch
+
+import pytest
+
+from api_client import TweedeKamerAPI
+
+
+class TestTweedeKamerAPILogging:
+    def test_get_motions_error_logged(self, caplog):
+        api = TweedeKamerAPI()
+        caplog.set_level(logging.ERROR, logger="api_client")
+
+        with patch.object(api, "_get_voting_records", side_effect=Exception("network down")):
+            result = api.get_motions()
+
+        assert result == []
+        assert any("network down" in rec.message for rec in caplog.records)
+        assert any(rec.levelno == logging.ERROR for rec in caplog.records)