From 706e8d56128787478c0f1a28061005db097a8a5e Mon Sep 17 00:00:00 2001
From: G Johansson <goran.johansson@shiftit.se>
Date: Tue, 28 Mar 2023 09:35:09 +0200
Subject: [PATCH] Add product calculation to Group sensor (#87373)

* Group product

* config flow
---
 homeassistant/components/group/config_flow.py |  1 +
 homeassistant/components/group/sensor.py      | 14 ++++++++++++++
 tests/components/group/test_sensor.py         |  3 +++
 3 files changed, 18 insertions(+)

diff --git a/homeassistant/components/group/config_flow.py b/homeassistant/components/group/config_flow.py
index 069f74bf707..53a8fd06264 100644
--- a/homeassistant/components/group/config_flow.py
+++ b/homeassistant/components/group/config_flow.py
@@ -31,6 +31,7 @@ _STATISTIC_MEASURES = [
     selector.SelectOptionDict(value="last", label="Most recently updated"),
     selector.SelectOptionDict(value="range", label="Statistical range"),
     selector.SelectOptionDict(value="sum", label="Sum"),
+    selector.SelectOptionDict(value="product", label="Product"),
 ]
 
 
diff --git a/homeassistant/components/group/sensor.py b/homeassistant/components/group/sensor.py
index 265e1640d06..4c6e8dccc1e 100644
--- a/homeassistant/components/group/sensor.py
+++ b/homeassistant/components/group/sensor.py
@@ -54,6 +54,7 @@ ATTR_LAST = "last"
 ATTR_LAST_ENTITY_ID = "last_entity_id"
 ATTR_RANGE = "range"
 ATTR_SUM = "sum"
+ATTR_PRODUCT = "product"
 SENSOR_TYPES = {
     ATTR_MIN_VALUE: "min",
     ATTR_MAX_VALUE: "max",
@@ -62,6 +63,7 @@ SENSOR_TYPES = {
     ATTR_LAST: "last",
     ATTR_RANGE: "range",
     ATTR_SUM: "sum",
+    ATTR_PRODUCT: "product",
 }
 SENSOR_TYPE_TO_ATTR = {v: k for k, v in SENSOR_TYPES.items()}
 
@@ -226,6 +228,17 @@ def calc_sum(
     return {}, result
 
 
+def calc_product(
+    sensor_values: list[tuple[str, float, State]]
+) -> tuple[dict[str, str | None], float]:
+    """Calculate a product of values."""
+    result = 1.0
+    for _, sensor_value, _ in sensor_values:
+        result *= sensor_value
+
+    return {}, result
+
+
 CALC_TYPES: dict[
     str,
     Callable[
@@ -239,6 +252,7 @@ CALC_TYPES: dict[
     "last": calc_last,
     "range": calc_range,
     "sum": calc_sum,
+    "product": calc_product,
 }
 
 
diff --git a/tests/components/group/test_sensor.py b/tests/components/group/test_sensor.py
index 5f85aa64854..39c9b788d56 100644
--- a/tests/components/group/test_sensor.py
+++ b/tests/components/group/test_sensor.py
@@ -1,6 +1,7 @@
 """The tests for the Group Sensor platform."""
 from __future__ import annotations
 
+from math import prod
 import statistics
 from typing import Any
 from unittest.mock import patch
@@ -45,6 +46,7 @@ MEAN = statistics.mean(VALUES)
 MEDIAN = statistics.median(VALUES)
 RANGE = max(VALUES) - min(VALUES)
 SUM_VALUE = sum(VALUES)
+PRODUCT_VALUE = prod(VALUES)
 
 
 @pytest.mark.parametrize(
@@ -57,6 +59,7 @@ SUM_VALUE = sum(VALUES)
         ("last", VALUES[2], {ATTR_LAST_ENTITY_ID: "sensor.test_3"}),
         ("range", RANGE, {}),
         ("sum", SUM_VALUE, {}),
+        ("product", PRODUCT_VALUE, {}),
     ],
 )
 async def test_sensors(