Add tts get engine ws command (#92336)

Co-authored-by: Erik Montnemery <erik@montnemery.com>

homeassistant/components/tts/__init__.py

@@ -206,6 +206,7 @@ def async_get_text_to_speech_languages(hass: HomeAssistant) -> set[str]:
 async def async_setup(hass: HomeAssistant, config: ConfigType) -> bool:
     """Set up TTS."""
     websocket_api.async_register_command(hass, websocket_list_engines)
+    websocket_api.async_register_command(hass, websocket_get_engine)
     websocket_api.async_register_command(hass, websocket_list_engine_voices)
 
     # Legacy config options
@@ -969,6 +970,47 @@ def websocket_list_engines(
     )
 
 
+@websocket_api.websocket_command(
+    {
+        "type": "tts/engine/get",
+        vol.Required("engine_id"): str,
+    }
+)
+@callback
+def websocket_get_engine(
+    hass: HomeAssistant, connection: websocket_api.ActiveConnection, msg: dict
+) -> None:
+    """Get text to speech engine info."""
+    component: EntityComponent[TextToSpeechEntity] = hass.data[DOMAIN]
+    manager: SpeechManager = hass.data[DATA_TTS_MANAGER]
+
+    engine_id = msg["engine_id"]
+    provider_info: dict[str, Any]
+
+    provider: TextToSpeechEntity | Provider | None = next(
+        (entity for entity in component.entities if entity.entity_id == engine_id), None
+    )
+    if not provider:
+        provider = manager.providers.get(engine_id)
+
+    if not provider:
+        connection.send_error(
+            msg["id"],
+            websocket_api.const.ERR_NOT_FOUND,
+            f"tts engine {engine_id} not found",
+        )
+        return
+
+    provider_info = {
+        "engine_id": engine_id,
+        "supported_languages": provider.supported_languages,
+    }
+
+    connection.send_message(
+        websocket_api.result_message(msg["id"], {"provider": provider_info})
+    )
+
+
 @websocket_api.websocket_command(
     {
         "type": "tts/engine/voices",

tests/components/tts/test_init.py

@@ -1623,7 +1623,7 @@ async def async_get_tts_audio(
 async def test_ws_list_engines(
     hass: HomeAssistant, hass_ws_client: WebSocketGenerator, setup: str, engine_id: str
 ) -> None:
-    """Test streaming audio and getting response."""
+    """Test listing tts engines and supported languages."""
     client = await hass_ws_client()
 
     await client.send_json_auto_id({"type": "tts/engine/list"})
@@ -1690,6 +1690,50 @@ async def test_ws_list_engines(
     }
 
 
+@pytest.mark.parametrize(
+    ("setup", "engine_id"),
+    [
+        ("mock_setup", "test"),
+        ("mock_config_entry_setup", "tts.test"),
+    ],
+    indirect=["setup"],
+)
+async def test_ws_get_engine(
+    hass: HomeAssistant, hass_ws_client: WebSocketGenerator, setup: str, engine_id: str
+) -> None:
+    """Test getting an tts engine."""
+    client = await hass_ws_client()
+
+    await client.send_json_auto_id({"type": "tts/engine/get", "engine_id": engine_id})
+
+    msg = await client.receive_json()
+    assert msg["success"]
+    assert msg["result"] == {
+        "provider": {
+            "engine_id": engine_id,
+            "supported_languages": ["de_CH", "de_DE", "en_GB", "en_US"],
+        }
+    }
+
+
+@pytest.mark.parametrize(
+    ("setup", "engine_id"),
+    [("mock_setup", "not_existing"), ("mock_config_entry_setup", "tts.not_existing")],
+    indirect=["setup"],
+)
+async def test_ws_get_engine_none_existing(
+    hass: HomeAssistant, hass_ws_client: WebSocketGenerator, setup: str, engine_id: str
+) -> None:
+    """Test getting a non existing tts engine."""
+    client = await hass_ws_client()
+
+    await client.send_json_auto_id({"type": "tts/engine/get", "engine_id": engine_id})
+
+    msg = await client.receive_json()
+    assert not msg["success"]
+    assert msg["error"]["code"] == "not_found"
+
+
 @pytest.mark.parametrize(
     ("setup", "engine_id"),
     [
@@ -1701,7 +1745,7 @@ async def test_ws_list_engines(
 async def test_ws_list_voices(
     hass: HomeAssistant, hass_ws_client: WebSocketGenerator, setup: str, engine_id: str
 ) -> None:
-    """Test streaming audio and getting response."""
+    """Test listing supported voices for a tts engine and language."""
     client = await hass_ws_client()
 
     await client.send_json_auto_id(