From 076d0fb58eb95fc33fd4ddd1998d9834e866c97d Mon Sep 17 00:00:00 2001
From: jsetton <jeremy.setton@gmail.com>
Date: Thu, 21 Dec 2023 01:16:57 -0500
Subject: [PATCH] [tuya] Add dimmer reversed value support

Signed-off-by: jsetton <jeremy.setton@gmail.com>
---
 .../tuya/internal/config/ChannelConfiguration.java       | 1 +
 .../binding/tuya/internal/handler/TuyaDeviceHandler.java | 9 ++++++++-
 .../src/main/resources/OH-INF/thing/thing-types.xml      | 6 ++++++
 3 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/bundles/org.smarthomej.binding.tuya/src/main/java/org/smarthomej/binding/tuya/internal/config/ChannelConfiguration.java b/bundles/org.smarthomej.binding.tuya/src/main/java/org/smarthomej/binding/tuya/internal/config/ChannelConfiguration.java
index 092d723211..38d4e9ef42 100644
--- a/bundles/org.smarthomej.binding.tuya/src/main/java/org/smarthomej/binding/tuya/internal/config/ChannelConfiguration.java
+++ b/bundles/org.smarthomej.binding.tuya/src/main/java/org/smarthomej/binding/tuya/internal/config/ChannelConfiguration.java
@@ -25,6 +25,7 @@ public class ChannelConfiguration {
     public int dp2 = 0;
     public int min = Integer.MIN_VALUE;
     public int max = Integer.MAX_VALUE;
+    public boolean reversed = false;
     public String range = "";
     public String irCode = "";
     public int irSendDelay = 300;
diff --git a/bundles/org.smarthomej.binding.tuya/src/main/java/org/smarthomej/binding/tuya/internal/handler/TuyaDeviceHandler.java b/bundles/org.smarthomej.binding.tuya/src/main/java/org/smarthomej/binding/tuya/internal/handler/TuyaDeviceHandler.java
index 5d4f39bfc4..8529f0a879 100644
--- a/bundles/org.smarthomej.binding.tuya/src/main/java/org/smarthomej/binding/tuya/internal/handler/TuyaDeviceHandler.java
+++ b/bundles/org.smarthomej.binding.tuya/src/main/java/org/smarthomej/binding/tuya/internal/handler/TuyaDeviceHandler.java
@@ -172,7 +172,11 @@ private void processChannelStatus(Integer dp, Object value) {
                 return;
             } else if (Double.class.isAssignableFrom(value.getClass())
                     && CHANNEL_TYPE_UID_DIMMER.equals(channelTypeUID)) {
-                updateState(channelId, ConversionUtil.brightnessDecode((double) value, 0, configuration.max));
+                double brightness = (double) value;
+                if (configuration.reversed) {
+                    brightness = configuration.max - brightness;
+                }
+                updateState(channelId, ConversionUtil.brightnessDecode(brightness, 0, configuration.max));
                 return;
             } else if (Double.class.isAssignableFrom(value.getClass())
                     && CHANNEL_TYPE_UID_NUMBER.equals(channelTypeUID)) {
@@ -300,6 +304,9 @@ public void handleCommand(ChannelUID channelUID, Command command) {
         } else if (CHANNEL_TYPE_UID_DIMMER.equals(channelTypeUID)) {
             if (command instanceof PercentType) {
                 int value = ConversionUtil.brightnessEncode((PercentType) command, 0, configuration.max);
+                if (configuration.reversed) {
+                    value = configuration.max - value;
+                }
                 if (value >= configuration.min) {
                     commandRequest.put(configuration.dp, value);
                 }
diff --git a/bundles/org.smarthomej.binding.tuya/src/main/resources/OH-INF/thing/thing-types.xml b/bundles/org.smarthomej.binding.tuya/src/main/resources/OH-INF/thing/thing-types.xml
index d295cb733b..37de3165e3 100644
--- a/bundles/org.smarthomej.binding.tuya/src/main/resources/OH-INF/thing/thing-types.xml
+++ b/bundles/org.smarthomej.binding.tuya/src/main/resources/OH-INF/thing/thing-types.xml
@@ -149,6 +149,12 @@
 			<parameter name="max" type="integer">
 				<label>Maximum</label>
 			</parameter>
+			<parameter name="reversed" type="boolean">
+				<label>Reversed</label>
+				<description>Changes the direction of the scale (e.g. 0 becomes 100, 100 becomes 0).</description>
+				<default>false</default>
+				<advanced>true</advanced>
+			</parameter>
 		</config-description>
 	</channel-type>