Fix due date calculation for future dailies in Habitica integration (#126403)

Calculate next due date for dailies with startdate in the future

homeassistant/components/habitica/util.py

@@ -3,7 +3,7 @@
 from __future__ import annotations
 
 import datetime
-from typing import Any
+from typing import TYPE_CHECKING, Any
 
 from homeassistant.components.automation import automations_with_entity
 from homeassistant.components.script import scripts_with_entity
@@ -14,25 +14,44 @@ from homeassistant.util import dt as dt_util
 def next_due_date(task: dict[str, Any], last_cron: str) -> datetime.date | None:
     """Calculate due date for dailies and yesterdailies."""
 
+    today = to_date(last_cron)
+    startdate = to_date(task["startDate"])
+    if TYPE_CHECKING:
+        assert today
+        assert startdate
+
     if task["isDue"] and not task["completed"]:
-        return dt_util.as_local(datetime.datetime.fromisoformat(last_cron)).date()
+        return to_date(last_cron)
+
+    if startdate > today:
+        if task["frequency"] == "daily" or (
+            task["frequency"] in ("monthly", "yearly") and task["daysOfMonth"]
+        ):
+            return startdate
+
+        if (
+            task["frequency"] in ("weekly", "monthly")
+            and (nextdue := to_date(task["nextDue"][0]))
+            and startdate > nextdue
+        ):
+            return to_date(task["nextDue"][1])
+
+    return to_date(task["nextDue"][0])
+
+
+def to_date(date: str) -> datetime.date | None:
+    """Convert an iso date to a datetime.date object."""
     try:
-        return dt_util.as_local(
+        return dt_util.as_local(datetime.datetime.fromisoformat(date)).date()
-            datetime.datetime.fromisoformat(task["nextDue"][0])
-        ).date()
     except ValueError:
-        # sometimes nextDue dates are in this format instead of iso:
+        # sometimes nextDue dates are JavaScript datetime strings instead of iso:
         # "Mon May 06 2024 00:00:00 GMT+0200"
         try:
             return dt_util.as_local(
-                datetime.datetime.strptime(
+                datetime.datetime.strptime(date, "%a %b %d %Y %H:%M:%S %Z%z")
-                    task["nextDue"][0], "%a %b %d %Y %H:%M:%S %Z%z"
-                )
             ).date()
         except ValueError:
             return None
-    except IndexError:
-        return None
 
 
 def entity_used_in(hass: HomeAssistant, entity_id: str) -> list[str]: