From 9c96ec858a1506a60bcc7ee4031ba030efea530a Mon Sep 17 00:00:00 2001
From: Santobert <tobhaase@gmail.com>
Date: Fri, 4 Oct 2019 23:32:10 +0200
Subject: [PATCH] switch reproduce state (#27202)

---
 .../components/switch/reproduce_state.py      | 61 +++++++++++++++++++
 .../components/switch/test_reproduce_state.py | 50 +++++++++++++++
 2 files changed, 111 insertions(+)
 create mode 100644 homeassistant/components/switch/reproduce_state.py
 create mode 100644 tests/components/switch/test_reproduce_state.py

diff --git a/homeassistant/components/switch/reproduce_state.py b/homeassistant/components/switch/reproduce_state.py
new file mode 100644
index 00000000000..7ed1f70cb97
--- /dev/null
+++ b/homeassistant/components/switch/reproduce_state.py
@@ -0,0 +1,61 @@
+"""Reproduce an Switch state."""
+import asyncio
+import logging
+from typing import Iterable, Optional
+
+from homeassistant.const import (
+    ATTR_ENTITY_ID,
+    STATE_ON,
+    STATE_OFF,
+    SERVICE_TURN_OFF,
+    SERVICE_TURN_ON,
+)
+from homeassistant.core import Context, State
+from homeassistant.helpers.typing import HomeAssistantType
+
+from . import DOMAIN
+
+_LOGGER = logging.getLogger(__name__)
+
+VALID_STATES = {STATE_ON, STATE_OFF}
+
+
+async def _async_reproduce_state(
+    hass: HomeAssistantType, state: State, context: Optional[Context] = None
+) -> None:
+    """Reproduce a single state."""
+    cur_state = hass.states.get(state.entity_id)
+
+    if cur_state is None:
+        _LOGGER.warning("Unable to find entity %s", state.entity_id)
+        return
+
+    if state.state not in VALID_STATES:
+        _LOGGER.warning(
+            "Invalid state specified for %s: %s", state.entity_id, state.state
+        )
+        return
+
+    # Return if we are already at the right state.
+    if cur_state.state == state.state:
+        return
+
+    service_data = {ATTR_ENTITY_ID: state.entity_id}
+
+    if state.state == STATE_ON:
+        service = SERVICE_TURN_ON
+    elif state.state == STATE_OFF:
+        service = SERVICE_TURN_OFF
+
+    await hass.services.async_call(
+        DOMAIN, service, service_data, context=context, blocking=True
+    )
+
+
+async def async_reproduce_states(
+    hass: HomeAssistantType, states: Iterable[State], context: Optional[Context] = None
+) -> None:
+    """Reproduce Switch states."""
+    await asyncio.gather(
+        *(_async_reproduce_state(hass, state, context) for state in states)
+    )
diff --git a/tests/components/switch/test_reproduce_state.py b/tests/components/switch/test_reproduce_state.py
new file mode 100644
index 00000000000..4b6db84bfdd
--- /dev/null
+++ b/tests/components/switch/test_reproduce_state.py
@@ -0,0 +1,50 @@
+"""Test reproduce state for Switch."""
+from homeassistant.core import State
+
+from tests.common import async_mock_service
+
+
+async def test_reproducing_states(hass, caplog):
+    """Test reproducing Switch states."""
+    hass.states.async_set("switch.entity_off", "off", {})
+    hass.states.async_set("switch.entity_on", "on", {})
+
+    turn_on_calls = async_mock_service(hass, "switch", "turn_on")
+    turn_off_calls = async_mock_service(hass, "switch", "turn_off")
+
+    # These calls should do nothing as entities already in desired state
+    await hass.helpers.state.async_reproduce_state(
+        [State("switch.entity_off", "off"), State("switch.entity_on", "on", {})],
+        blocking=True,
+    )
+
+    assert len(turn_on_calls) == 0
+    assert len(turn_off_calls) == 0
+
+    # Test invalid state is handled
+    await hass.helpers.state.async_reproduce_state(
+        [State("switch.entity_off", "not_supported")], blocking=True
+    )
+
+    assert "not_supported" in caplog.text
+    assert len(turn_on_calls) == 0
+    assert len(turn_off_calls) == 0
+
+    # Make sure correct services are called
+    await hass.helpers.state.async_reproduce_state(
+        [
+            State("switch.entity_on", "off"),
+            State("switch.entity_off", "on", {}),
+            # Should not raise
+            State("switch.non_existing", "on"),
+        ],
+        blocking=True,
+    )
+
+    assert len(turn_on_calls) == 1
+    assert turn_on_calls[0].domain == "switch"
+    assert turn_on_calls[0].data == {"entity_id": "switch.entity_off"}
+
+    assert len(turn_off_calls) == 1
+    assert turn_off_calls[0].domain == "switch"
+    assert turn_off_calls[0].data == {"entity_id": "switch.entity_on"}