feature: sync user email notifications

backend/bot/services/user_email_notifications.py

@@ -0,0 +1,84 @@
+import logging
+from typing import Any, Optional
+
+from bot.middlewares.i18n import JsonI18n
+from bot.services.email_auth_service import EmailAuthService
+from bot.services.email_templates import render_user_notification
+from config.settings import Settings
+
+
+def _translate(
+    i18n: Optional[JsonI18n],
+    language: str,
+    key: Optional[str],
+    fallback: str = "",
+    **kwargs: Any,
+) -> str:
+    if not key:
+        return fallback
+    if not i18n:
+        return fallback or key
+    text = i18n.gettext(language, key, **kwargs)
+    return fallback if text == key and fallback else text
+
+
+async def send_user_notification_email(
+    *,
+    settings: Settings,
+    i18n: Optional[JsonI18n],
+    user: Any,
+    subject_key: str,
+    message_text: str,
+    dashboard_url: Optional[str] = None,
+    cta_label_key: str = "email_user_notification_cta",
+    subject_kwargs: Optional[dict[str, Any]] = None,
+    heading_key: Optional[str] = None,
+    intro_key: Optional[str] = None,
+) -> bool:
+    if not getattr(settings, "email_auth_configured", False):
+        return False
+    recipient = str(getattr(user, "email", "") or "").strip()
+    if not recipient:
+        return False
+
+    language = (
+        str(getattr(user, "language_code", "") or "").strip()
+        or getattr(settings, "DEFAULT_LANGUAGE", "ru")
+        or "ru"
+    )
+    kwargs = subject_kwargs or {}
+    subject = _translate(i18n, language, subject_key, subject_key, **kwargs)
+    heading = _translate(i18n, language, heading_key, subject, **kwargs)
+    intro = _translate(
+        i18n,
+        language,
+        intro_key or "email_user_notification_intro",
+        "Notification from your account.",
+    )
+    cta_label = _translate(
+        i18n,
+        language,
+        cta_label_key or "email_user_notification_cta",
+        "Open dashboard",
+    )
+
+    try:
+        content = render_user_notification(
+            settings,
+            language_code=language,
+            subject=subject,
+            heading=heading,
+            intro=intro,
+            message_text=message_text,
+            dashboard_url=dashboard_url,
+            cta_label=cta_label,
+            i18n=i18n,
+        )
+        await EmailAuthService(settings, i18n).send_rendered_email(
+            email=recipient,
+            content=content,
+        )
+        return True
+    except Exception:
+        logging.exception("Failed to send user notification email to %s.", recipient)
+        return False