add difficulty to daily quests

app/services/dailyquests.py

@@ -34,6 +34,42 @@ class DailyQuestsService:
     """
 
     DEFAULT_DAILY_COUNT = 3
+    
+    def _choose_by_difficulty(self, pool: List[dict]) -> List[dict]:
+        # группируем по сложности
+        buckets = {"easy": [], "medium": [], "hard": []}
+        for it in pool:
+            diff = str(it.get("difficulty", "")).lower()
+            if diff in buckets:
+                buckets[diff].append(it)
+
+        chosen: List[dict] = []
+
+        # по 1 из каждой сложности, weighted, без повторов
+        for diff in ("easy", "medium", "hard"):
+            items = buckets[diff]
+            if not items:
+                continue
+            pick = random.choices(
+                items,
+                weights=[max(1, int(x.get("weight", 1) or 1)) for x in items],
+                k=1
+            )[0]
+            chosen.append(pick)
+
+        # если чего-то не хватило (например нет hard в пуле) —
+        # добиваем случайными из оставшихся enabled, чтобы всё равно было 3
+        need_total = 3
+        if len(chosen) < need_total:
+            already = {c.get("key") for c in chosen}
+            rest = [x for x in pool if x.get("key") not in already]
+            if rest:
+                extra = self._weighted_sample_without_replacement(
+                    rest, k=min(need_total - len(chosen), len(rest))
+                )
+                chosen.extend(extra)
+
+        return chosen
 
     async def get_status(self, username: str) -> dict:
         now_utc = datetime.now(timezone.utc)
@@ -228,9 +264,7 @@ class DailyQuestsService:
             await user_daily_quests_collection.insert_one(doc)
             return doc
 
-        count = self.DEFAULT_DAILY_COUNT
-        # weighted random without replacement
-        chosen = self._weighted_sample_without_replacement(pool, k=min(count, len(pool)))
+        chosen = self._choose_by_difficulty(pool)
 
         quests = []
         for tpl in chosen: