Keep the ambient colour when the light turns on

The MCU resets the colour to Cycle on every turn-on. Remember the chosen colour
across restarts and send it again just after the MCU reports the light on.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

wake-up-light-ii.yaml

@@ -22,7 +22,7 @@ external_components:
   - source:
       type: git
       url: https://mangavalk.com/mangavalk/esphome-wake-up-light-ii.git
-      ref: v1.0.4
+      ref: v1.0.5
     components: [uart]
     refresh: 1d
 
@@ -136,6 +136,23 @@ globals:
     restore_value: no
     initial_value: '0'
 
+  # Ambient colour (DP132). The MCU resets it to Cycle (0) whenever the ambient
+  # light turns on, so the chosen colour is kept here and sent again.
+  - id: ambient_color_saved
+    type: uint8_t
+    restore_value: yes
+    initial_value: '0'
+
+  - id: ambient_color_now
+    type: uint8_t
+    restore_value: no
+    initial_value: '0'
+
+  - id: ambient_on_ms
+    type: uint32_t
+    restore_value: no
+    initial_value: '0'
+
   # When the MCU last sent its once-a-minute clock report.
   - id: last_mcu_report
     type: uint32_t
@@ -301,6 +318,24 @@ tuya:
             id(alarm_raw_valid) = true;
             id(publish_alarm_summaries).execute();
 
+    # DP129: ambient light. On every turn-on the MCU resets DP132 to Cycle.
+    - sensor_datapoint: 129
+      datapoint_type: bool
+      then:
+        - lambda: |-
+            if (!x) return;
+            id(ambient_on_ms) = millis();
+            id(restore_ambient_color).execute();
+
+    # DP132: ambient colour. A change reported while the light has been on for a
+    # moment came from the user (lamp buttons or here), so remember it.
+    - sensor_datapoint: 132
+      datapoint_type: enum
+      then:
+        - lambda: |-
+            id(ambient_color_now) = x;
+            if (millis() - id(ambient_on_ms) > 1500) id(ambient_color_saved) = x;
+
     # DP128: sunset settings, 10 bytes, per Tuya's data model:
     # [0] switch (unused) [1] mode: 0=sound, 1=sound+light, 2=radio, 3=radio+light
     # [2] sound 1..4 [3] sound volume 1..16 [4] sound duration 10..120
@@ -400,6 +435,15 @@ script:
                 call.set_transition_length(0);
                 call.perform();
 
+  - id: restore_ambient_color
+    mode: restart
+    then:
+      - delay: 400ms
+      - lambda: |-
+          if (id(ambient_color_saved) == 0) return;
+          ESP_LOGI("ambient", "Restoring ambient colour %u", (unsigned) id(ambient_color_saved));
+          id(tuya_mcu).set_enum_datapoint_value(132, id(ambient_color_saved));
+
   - id: radio_step
     mode: queued
     parameters:
@@ -682,19 +726,32 @@ select:
       sorting_group_id: group_snooze
       sorting_weight: 3
 
-  - platform: tuya
+  - platform: template
     id: ambient_color
     name: "Ambient Color"
-    enum_datapoint: 132
     options:
-      0: "Cycle"
-      1: "Red"
-      2: "Orange"
-      3: "Yellow"
-      4: "Green"
-      5: "Cyan"
-      6: "Blue"
-      7: "Purple"
+      - "Cycle"
+      - "Red"
+      - "Orange"
+      - "Yellow"
+      - "Green"
+      - "Cyan"
+      - "Blue"
+      - "Purple"
+    update_interval: 1s
+    lambda: |-
+      static const char *const names[8] = {"Cycle", "Red", "Orange", "Yellow", "Green", "Cyan", "Blue", "Purple"};
+      if (id(ambient_color_now) > 7) return {};
+      return std::string(names[id(ambient_color_now)]);
+    set_action:
+      - lambda: |-
+          static const char *const names[8] = {"Cycle", "Red", "Orange", "Yellow", "Green", "Cyan", "Blue", "Purple"};
+          for (uint8_t i = 0; i < 8; i++) {
+            if (x == names[i]) {
+              id(ambient_color_saved) = i;
+              id(tuya_mcu).set_enum_datapoint_value(132, i);
+            }
+          }
     web_server:
       sorting_group_id: group_light
       sorting_weight: 3