From 29e105b0ef985531c8561f5cbc8ca8f8f4c5de94 Mon Sep 17 00:00:00 2001
From: Paulus Schoutsen <balloob@gmail.com>
Date: Wed, 16 Jul 2025 12:19:31 +0200
Subject: [PATCH] Set default mode for number selector to box (#148773)

---
 homeassistant/helpers/selector.py | 10 ++++++----
 tests/helpers/test_selector.py    | 21 ++++++++++++++++++++-
 2 files changed, 26 insertions(+), 5 deletions(-)

diff --git a/homeassistant/helpers/selector.py b/homeassistant/helpers/selector.py
index 0fa5403ad2b..7bd1ee9ddf3 100644
--- a/homeassistant/helpers/selector.py
+++ b/homeassistant/helpers/selector.py
@@ -1108,10 +1108,12 @@ class NumberSelectorMode(StrEnum):
 
 def validate_slider(data: Any) -> Any:
     """Validate configuration."""
-    if data["mode"] == "box":
-        return data
+    has_min_max = "min" in data and "max" in data
 
-    if "min" not in data or "max" not in data:
+    if "mode" not in data:
+        data["mode"] = "slider" if has_min_max else "box"
+
+    if data["mode"] == "slider" and not has_min_max:
         raise vol.Invalid("min and max are required in slider mode")
 
     return data
@@ -1134,7 +1136,7 @@ class NumberSelector(Selector[NumberSelectorConfig]):
                     "any", vol.All(vol.Coerce(float), vol.Range(min=1e-3))
                 ),
                 vol.Optional(CONF_UNIT_OF_MEASUREMENT): str,
-                vol.Optional(CONF_MODE, default=NumberSelectorMode.SLIDER): vol.All(
+                vol.Optional(CONF_MODE): vol.All(
                     vol.Coerce(NumberSelectorMode), lambda val: val.value
                 ),
                 vol.Optional("translation_key"): str,
diff --git a/tests/helpers/test_selector.py b/tests/helpers/test_selector.py
index 159f295ab2f..dc25206177b 100644
--- a/tests/helpers/test_selector.py
+++ b/tests/helpers/test_selector.py
@@ -427,6 +427,7 @@ def test_assist_pipeline_selector_schema(
         ({"mode": "box"}, (10,), ()),
         ({"mode": "box", "step": "any"}, (), ()),
         ({"mode": "slider", "min": 0, "max": 1, "step": "any"}, (), ()),
+        ({}, (), ()),
     ],
 )
 def test_number_selector_schema(schema, valid_selections, invalid_selections) -> None:
@@ -434,10 +435,28 @@ def test_number_selector_schema(schema, valid_selections, invalid_selections) ->
     _test_selector("number", schema, valid_selections, invalid_selections)
 
 
+def test_number_selector_schema_default_mode() -> None:
+    """Test number selector default mode set on min/max."""
+    assert selector.selector({"number": {"min": 10, "max": 50}}).config == {
+        "mode": "slider",
+        "min": 10.0,
+        "max": 50.0,
+        "step": 1.0,
+    }
+    assert selector.selector({"number": {}}).config == {
+        "mode": "box",
+        "step": 1.0,
+    }
+    assert selector.selector({"number": {"min": "10"}}).config == {
+        "mode": "box",
+        "min": 10.0,
+        "step": 1.0,
+    }
+
+
 @pytest.mark.parametrize(
     "schema",
     [
-        {},  # Must have mandatory fields
         {"mode": "slider"},  # Must have min+max in slider mode
     ],
 )