Allow finding relevant blueprints

homeassistant/components/blueprint/__init__.py

@@ -1,7 +1,13 @@
 """The blueprint integration."""
 
+from typing import Any
+
+import voluptuous as vol
+
+from homeassistant.const import CONF_NAME, CONF_SELECTOR
 from homeassistant.core import HomeAssistant
-from homeassistant.helpers import config_validation as cv
+from homeassistant.helpers import config_validation as cv, entity_registry as er
+from homeassistant.helpers.selector import selector as create_selector
 from homeassistant.helpers.typing import ConfigType
 
 from . import websocket_api
@@ -29,3 +35,57 @@ async def async_setup(hass: HomeAssistant, config: ConfigType) -> bool:
     """Set up the blueprint integration."""
     websocket_api.async_setup(hass)
     return True
+
+
+async def async_find_relevant_blueprints(
+    hass: HomeAssistant, device_id: str
+) -> dict[str, list[dict[str, Any]]]:
+    """Find all blueprints relevant to a specific device."""
+    results = {}
+    entities = er.async_entries_for_device(er.async_get(hass), device_id)
+
+    async def all_blueprints_generator(hass: HomeAssistant):
+        """Yield all blueprints from all domains."""
+        blueprint_domains: dict[str, DomainBlueprints] = hass.data[DOMAIN]
+        for blueprint_domain in blueprint_domains.values():
+            blueprints = await blueprint_domain.async_get_blueprints()
+            for blueprint in blueprints.values():
+                yield blueprint
+
+    async for blueprint in all_blueprints_generator(hass):
+        blueprint_input_matches: dict[str, list[str]] = {}
+
+        for info in blueprint.inputs.values():
+            if (
+                not info
+                or not (selector_conf := info.get(CONF_SELECTOR))
+                or "entity" not in selector_conf
+            ):
+                continue
+
+            selector = create_selector(selector_conf)
+
+            matched = []
+
+            for entity in entities:
+                try:
+                    entity.entity_id, selector(entity.entity_id)
+                except vol.Invalid:
+                    continue
+
+                matched.append(entity.entity_id)
+
+            if matched:
+                blueprint_input_matches[info[CONF_NAME]] = matched
+
+        if not blueprint_input_matches:
+            continue
+
+        results.setdefault(blueprint.domain, []).append(
+            {
+                "blueprint": blueprint,
+                "matched_input": blueprint_input_matches,
+            }
+        )
+
+    return results

tests/components/blueprint/test_init.py

@@ -1 +1,58 @@
 """Tests for the blueprint init."""
+
+from pathlib import Path
+from unittest.mock import patch
+
+from homeassistant.components import automation, blueprint
+from homeassistant.core import HomeAssistant
+from homeassistant.helpers import device_registry as dr, entity_registry as er
+
+from tests.common import MockConfigEntry
+
+
+async def test_find_relevant_blueprints(
+    hass: HomeAssistant,
+    entity_registry: er.EntityRegistry,
+    device_registry: dr.DeviceRegistry,
+) -> None:
+    """Test finding relevant blueprints."""
+    config_entry = MockConfigEntry()
+    config_entry.add_to_hass(hass)
+
+    device = device_registry.async_get_or_create(
+        config_entry_id=config_entry.entry_id,
+        identifiers={("test_domain", "test_device")},
+        name="Test Device",
+    )
+    entity_registry.async_get_or_create(
+        "person",
+        "test_domain",
+        "test_entity",
+        device_id=device.id,
+        original_name="Test Person",
+    )
+
+    with patch.object(
+        hass.config,
+        "path",
+        return_value=Path(automation.__file__).parent / "blueprints",
+    ):
+        automation.async_get_blueprints(hass)
+        results = await blueprint.async_find_relevant_blueprints(hass, device.id)
+
+    for matches in results.values():
+        for match in matches:
+            match["blueprint"] = match["blueprint"].name
+
+    assert results == {
+        "automation": [
+            {
+                "blueprint": "Motion-activated Light",
+                "matched_input": {
+                    "Person": [
+                        "person.test_domain_test_entity",
+                    ]
+                },
+            }
+        ]
+    }