Add conversation reload service (#86175)

* Add preload and reload service calls to conversation

* Add conversation preload/reload to websocket API

* Merge prepare into reload

* reload service and prepare websocket API

* Add preload and reload service calls to conversation

* Add conversation preload/reload to websocket API

* Merge prepare into reload

* reload service and prepare websocket API

* Add language lock for loading intents

* Add more tests for code coverage

tests/components/conversation/test_init.py

@@ -329,6 +329,34 @@ async def test_ws_api(hass, hass_ws_client, payload):
     }
 
 
+# pylint: disable=protected-access
+async def test_ws_prepare(hass, hass_ws_client):
+    """Test the Websocket prepare conversation API."""
+    assert await async_setup_component(hass, "conversation", {})
+    agent = await conversation._get_agent(hass)
+    assert isinstance(agent, conversation.DefaultAgent)
+
+    # No intents should be loaded yet
+    assert not agent._lang_intents.get(hass.config.language)
+
+    client = await hass_ws_client(hass)
+
+    await client.send_json(
+        {
+            "id": 5,
+            "type": "conversation/prepare",
+        }
+    )
+
+    msg = await client.receive_json()
+
+    assert msg["success"]
+    assert msg["id"] == 5
+
+    # Intents should now be load
+    assert agent._lang_intents.get(hass.config.language)
+
+
 async def test_custom_sentences(hass, hass_client, hass_admin_user):
     """Test custom sentences with a custom intent."""
     assert await async_setup_component(hass, "homeassistant", {})
@@ -367,3 +395,39 @@ async def test_custom_sentences(hass, hass_client, hass_admin_user):
             },
             "conversation_id": None,
         }
+
+
+# pylint: disable=protected-access
+async def test_prepare_reload(hass):
+    """Test calling the reload service."""
+    language = hass.config.language
+    assert await async_setup_component(hass, "conversation", {})
+
+    # Load intents
+    agent = await conversation._get_agent(hass)
+    assert isinstance(agent, conversation.DefaultAgent)
+    await agent.async_prepare(language)
+
+    # Confirm intents are loaded
+    assert agent._lang_intents.get(language)
+
+    # Clear cache
+    await hass.services.async_call("conversation", "reload", {})
+    await hass.async_block_till_done()
+
+    # Confirm intent cache is cleared
+    assert not agent._lang_intents.get(language)
+
+
+# pylint: disable=protected-access
+async def test_prepare_fail(hass):
+    """Test calling prepare with a non-existent language."""
+    assert await async_setup_component(hass, "conversation", {})
+
+    # Load intents
+    agent = await conversation._get_agent(hass)
+    assert isinstance(agent, conversation.DefaultAgent)
+    await agent.async_prepare("not-a-language")
+
+    # Confirm no intents were loaded
+    assert not agent._lang_intents.get("not-a-language")