fix: Home Assistant: allow to override discovery type

[Koenkk]

This PR enables overriding the HA discovery type through expose.withHomeAssistant(). Implemented for the use-case of @jbouwh to expose IR entities, example:

e.text("ir_code_to_send", ea.SET).withDescription("The IR code or timings to send by device").withHomeAssistant({type: "infrared"})

The type overrides the the type in the topic on which the HA discovery payload is published.

CC: @MaxRink

[jbouwh]

We need 2 different entities for IR emitter and receiver. These entities will also require a schema setting: home-assistant/core#172796

[jbouwh]

If the schema property can be added and the value_template be customized like this:

diff --git a/lib/extension/homeassistant.ts b/lib/extension/homeassistant.ts
index b1185cb0..01730a37 100644
--- a/lib/extension/homeassistant.ts
+++ b/lib/extension/homeassistant.ts
@@ -381,6 +381,10 @@ const applyHomeAssistantExposeMetadata = (payload: DiscoveryEntry, homeAssistant
         payload.type = homeAssistant.type;
     }
 
+    if (homeAssistant.property !== undefined) {
+        payload.discovery_payload.schema = homeAssistant.schema;
+    }
+
     if (homeAssistant.entityCategory !== undefined) {
         payload.discovery_payload.entity_category = homeAssistant.entityCategory;
     }
@@ -1424,6 +1428,14 @@ export class HomeAssistant extends Extension {
                 delete entry.discovery_payload.entity_category;
             }
 
+            if (entry.type === "infrared") {
+                if (entry.discovery_payload.schema === "receiver") {
+                    entry.discovery_payload.value_template = "{{ value_json.learned_ir_timings | tojson }}";
+                } else {
+                    delete entry.discovery_payload.value_template;
+                }
+            }
+
             // Let Home Assistant generate entity name when device_class is present.
             // preserve_name allows device_class and explicit name to coexist (e.g. derived sensors).
             if (entry.discovery_payload.device_class && !NUMERIC_DISCOVERY_LOOKUP[firstExpose.name]?.preserve_name) {

Then this could work.

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