Support Next/Previous for InputSelector (#38378)

* Support Next/Previous for InputSelector

* Update homeassistant/components/google_assistant/trait.py

Co-authored-by: Paulus Schoutsen <paulus@home-assistant.io>

* Adjust to match new version of _next_selected

Co-authored-by: Paulus Schoutsen <paulus@home-assistant.io>

homeassistant/components/google_assistant/const.py

@@ -97,6 +97,7 @@ ERR_NOT_SUPPORTED = "notSupported"
 ERR_PROTOCOL_ERROR = "protocolError"
 ERR_UNKNOWN_ERROR = "unknownError"
 ERR_FUNCTION_NOT_SUPPORTED = "functionNotSupported"
+ERR_UNSUPPORTED_INPUT = "unsupportedInput"
 
 ERR_ALREADY_DISARMED = "alreadyDisarmed"
 ERR_ALREADY_ARMED = "alreadyArmed"

homeassistant/components/google_assistant/trait.py

@@ -1,5 +1,6 @@
 """Implement the Google Smart Home traits."""
 import logging
+from typing import List, Optional
 
 from homeassistant.components import (
     alarm_control_panel,
@@ -68,6 +69,7 @@ from .const import (
     ERR_CHALLENGE_NOT_SETUP,
     ERR_FUNCTION_NOT_SUPPORTED,
     ERR_NOT_SUPPORTED,
+    ERR_UNSUPPORTED_INPUT,
     ERR_VALUE_OUT_OF_RANGE,
 )
 from .error import ChallengeNeeded, SmartHomeError
@@ -114,6 +116,8 @@ COMMAND_LOCKUNLOCK = f"{PREFIX_COMMANDS}LockUnlock"
 COMMAND_FANSPEED = f"{PREFIX_COMMANDS}SetFanSpeed"
 COMMAND_MODES = f"{PREFIX_COMMANDS}SetModes"
 COMMAND_INPUT = f"{PREFIX_COMMANDS}SetInput"
+COMMAND_NEXT_INPUT = f"{PREFIX_COMMANDS}NextInput"
+COMMAND_PREVIOUS_INPUT = f"{PREFIX_COMMANDS}PreviousInput"
 COMMAND_OPENCLOSE = f"{PREFIX_COMMANDS}OpenClose"
 COMMAND_SET_VOLUME = f"{PREFIX_COMMANDS}setVolume"
 COMMAND_VOLUME_RELATIVE = f"{PREFIX_COMMANDS}volumeRelative"
@@ -145,6 +149,20 @@ def _google_temp_unit(units):
     return "C"
 
 
+def _next_selected(items: List[str], selected: Optional[str]) -> Optional[str]:
+    """Return the next item in a item list starting at given value.
+
+    If selected is missing in items, None is returned
+    """
+    try:
+        index = items.index(selected)
+    except ValueError:
+        return None
+
+    next_item = 0 if index == len(items) - 1 else index + 1
+    return items[next_item]
+
+
 class _Trait:
     """Represents a Trait inside Google Assistant skill."""
 
@@ -1395,7 +1413,7 @@ class InputSelectorTrait(_Trait):
     """
 
     name = TRAIT_INPUTSELECTOR
-    commands = [COMMAND_INPUT]
+    commands = [COMMAND_INPUT, COMMAND_NEXT_INPUT, COMMAND_PREVIOUS_INPUT]
 
     SYNONYMS = {}
 
@@ -1428,7 +1446,20 @@ class InputSelectorTrait(_Trait):
 
     async def execute(self, command, data, params, challenge):
         """Execute an SetInputSource command."""
-        requested_source = params.get("newInput")
+        sources = self.state.attributes.get(media_player.ATTR_INPUT_SOURCE_LIST) or []
+        source = self.state.attributes.get(media_player.ATTR_INPUT_SOURCE)
+
+        if command == COMMAND_INPUT:
+            requested_source = params.get("newInput")
+        elif command == COMMAND_NEXT_INPUT:
+            requested_source = _next_selected(sources, source)
+        elif command == COMMAND_PREVIOUS_INPUT:
+            requested_source = _next_selected(list(reversed(sources)), source)
+        else:
+            raise SmartHomeError(ERR_NOT_SUPPORTED, "Unsupported command")
+
+        if requested_source not in sources:
+            raise SmartHomeError(ERR_UNSUPPORTED_INPUT, "Unsupported input")
 
         await self.hass.services.async_call(
             media_player.DOMAIN,

tests/components/google_assistant/test_trait.py

@@ -24,6 +24,7 @@ from homeassistant.components import (
 )
 from homeassistant.components.climate import const as climate
 from homeassistant.components.google_assistant import const, error, helpers, trait
+from homeassistant.components.google_assistant.error import SmartHomeError
 from homeassistant.components.humidifier import const as humidifier
 from homeassistant.config import async_process_ha_core_config
 from homeassistant.const import (
@@ -1428,6 +1429,87 @@ async def test_inputselector(hass):
     assert calls[0].data == {"entity_id": "media_player.living_room", "source": "media"}
 
 
+@pytest.mark.parametrize(
+    "sources,source,source_next,source_prev",
+    [
+        (["a"], "a", "a", "a"),
+        (["a", "b"], "a", "b", "b"),
+        (["a", "b", "c"], "a", "b", "c"),
+    ],
+)
+async def test_inputselector_nextprev(hass, sources, source, source_next, source_prev):
+    """Test input selector trait."""
+    trt = trait.InputSelectorTrait(
+        hass,
+        State(
+            "media_player.living_room",
+            media_player.STATE_PLAYING,
+            attributes={
+                media_player.ATTR_INPUT_SOURCE_LIST: sources,
+                media_player.ATTR_INPUT_SOURCE: source,
+            },
+        ),
+        BASIC_CONFIG,
+    )
+
+    assert trt.can_execute("action.devices.commands.NextInput", params={})
+    assert trt.can_execute("action.devices.commands.PreviousInput", params={})
+
+    calls = async_mock_service(
+        hass, media_player.DOMAIN, media_player.SERVICE_SELECT_SOURCE
+    )
+    await trt.execute(
+        "action.devices.commands.NextInput", BASIC_DATA, {}, {},
+    )
+    await trt.execute(
+        "action.devices.commands.PreviousInput", BASIC_DATA, {}, {},
+    )
+
+    assert len(calls) == 2
+    assert calls[0].data == {
+        "entity_id": "media_player.living_room",
+        "source": source_next,
+    }
+    assert calls[1].data == {
+        "entity_id": "media_player.living_room",
+        "source": source_prev,
+    }
+
+
+@pytest.mark.parametrize(
+    "sources,source", [(None, "a"), (["a", "b"], None), (["a", "b"], "c")]
+)
+async def test_inputselector_nextprev_invalid(hass, sources, source):
+    """Test input selector trait."""
+    trt = trait.InputSelectorTrait(
+        hass,
+        State(
+            "media_player.living_room",
+            media_player.STATE_PLAYING,
+            attributes={
+                media_player.ATTR_INPUT_SOURCE_LIST: sources,
+                media_player.ATTR_INPUT_SOURCE: source,
+            },
+        ),
+        BASIC_CONFIG,
+    )
+
+    with pytest.raises(SmartHomeError):
+        await trt.execute(
+            "action.devices.commands.NextInput", BASIC_DATA, {}, {},
+        )
+
+    with pytest.raises(SmartHomeError):
+        await trt.execute(
+            "action.devices.commands.PreviousInput", BASIC_DATA, {}, {},
+        )
+
+    with pytest.raises(SmartHomeError):
+        await trt.execute(
+            "action.devices.commands.InvalidCommand", BASIC_DATA, {}, {},
+        )
+
+
 async def test_modes_input_select(hass):
     """Test Input Select Mode trait."""
     assert helpers.get_google_type(input_select.DOMAIN, None) is not None