From 39358133364e2613689f661633bc485c8f3e1a1f Mon Sep 17 00:00:00 2001
From: Egor <egor.andrianovv@gmail.com>
Date: Thu, 20 Nov 2025 01:16:25 +0300
Subject: [PATCH] Trim Platega descriptions by byte length

---
 app/services/platega_service.py        | 31 +++++++++++++++++---------
 tests/services/test_platega_service.py | 25 +++++++++++++++++++++
 2 files changed, 46 insertions(+), 10 deletions(-)
 create mode 100644 tests/services/test_platega_service.py

diff --git a/app/services/platega_service.py b/app/services/platega_service.py
index 126f66ff..484ced42 100644
--- a/app/services/platega_service.py
+++ b/app/services/platega_service.py
@@ -181,19 +181,30 @@ class PlategaService:
         return None, raw_text
 
     @staticmethod
-    def _sanitize_description(description: str, max_length: int) -> str:
-        """Обрезает описание до максимально допустимой длины."""
+    def _sanitize_description(description: str, max_bytes: int) -> str:
+        """Обрезает описание с учётом байтового лимита Platega."""
 
         cleaned = (description or "").strip()
-        if max_length and len(cleaned) > max_length:
-            logger.debug(
-                "Platega description trimmed from %s to %s characters",
-                len(cleaned),
-                max_length,
-            )
-            return cleaned[:max_length]
+        if not max_bytes:
+            return cleaned
+
+        encoded = cleaned.encode("utf-8")
+        if len(encoded) <= max_bytes:
+            return cleaned
+
+        logger.debug(
+            "Platega description trimmed from %s to %s bytes",
+            len(encoded),
+            max_bytes,
+        )
+
+        trimmed_bytes = encoded[:max_bytes]
+        while True:
+            try:
+                return trimmed_bytes.decode("utf-8")
+            except UnicodeDecodeError:
+                trimmed_bytes = trimmed_bytes[:-1]
 
-        return cleaned
 
     @staticmethod
     def parse_expires_at(expires_in: Optional[str]) -> Optional[datetime]:
diff --git a/tests/services/test_platega_service.py b/tests/services/test_platega_service.py
new file mode 100644
index 00000000..62ff1913
--- /dev/null
+++ b/tests/services/test_platega_service.py
@@ -0,0 +1,25 @@
+import logging
+
+import pytest
+
+from app.services.platega_service import PlategaService
+
+
+def test_sanitize_description_limits_utf8_bytes(caplog: pytest.LogCaptureFixture) -> None:
+    caplog.set_level(logging.DEBUG)
+    original = "Интернет-сервис - Пополнение баланса на 50 ₽ и ещё чуть-чуть"
+
+    trimmed = PlategaService._sanitize_description(original, 64)
+
+    assert len(trimmed.encode("utf-8")) <= 64
+    assert trimmed != original
+    assert any("trimmed" in record.message for record in caplog.records)
+
+
+def test_sanitize_description_returns_clean_value() -> None:
+    original = "  Обычное описание  "
+
+    trimmed = PlategaService._sanitize_description(original, 64)
+
+    assert trimmed == "Обычное описание"
+    assert len(trimmed.encode("utf-8")) <= 64