From 6fa5b38bed3f8e73d6f86a844ef775735a3cad29 Mon Sep 17 00:00:00 2001
From: makefu <github@syntax-fehler.de>
Date: Tue, 31 Aug 2021 15:14:37 +0200
Subject: ma ham: consolidate button management

---
 makefu/2configs/home/ham/lib/default.nix | 76 ++++++++++++++++++++++++++++++++
 1 file changed, 76 insertions(+)

(limited to 'makefu/2configs/home/ham/lib/default.nix')

diff --git a/makefu/2configs/home/ham/lib/default.nix b/makefu/2configs/home/ham/lib/default.nix
index 45c86138..75be5273 100644
--- a/makefu/2configs/home/ham/lib/default.nix
+++ b/makefu/2configs/home/ham/lib/default.nix
@@ -40,5 +40,81 @@ in
       entity = "firetv";
     };
   };
+
   zigbee.prefix = "/ham/zigbee";
+
+  btn_cycle_light = light: btn: halfbright:
+  let
+    maxbright = 255;
+    transition = 0.2; # seconds
+  in
+  # this function implements a simple state machine based on the state and brightness of the light (light must support brightness
+  {
+    alias = "Cycle through states of ${light} via button ${btn}";
+    trigger = {
+      platform = "state";
+      entity_id = "sensor.${btn}_click";
+      to = "single";
+    };
+    action = {
+      choose = [
+        {
+          # state 0: off to half
+          conditions = {
+            condition = "template";
+            value_template = ''{{ states("${light}")  == "off" }}'';
+          };
+          sequence = [
+            {
+              service = "light.turn_on";
+              data = {
+                entity_id = light;
+                brightness = halfbright;
+              };
+            }
+          ];
+        }
+        {
+          # state 1: half to full
+          conditions = {
+            condition = "template";
+            value_template = ''{{ states('${light}')  == 'on' and ( ${toString (halfbright - 1)} <= state_attr("${light}","brightness") <= ${toString (halfbright + 1)})}}'';
+          };
+          sequence = [
+            {
+              service = "light.turn_on";
+              data = {
+                entity_id = light;
+                brightness = maxbright;
+              };
+            }
+          ];
+        }
+        {
+          # state 2: full to off
+          conditions =  {
+            condition = "template";
+            # TODO: it seems like the devices respond with brightness-1 , maybe off-by-one somewhere?
+            value_template = ''{{ states("${light}")  == "on" and state_attr("${light}","brightness") >= ${toString (maxbright - 1)}}}'';
+          };
+          sequence = [
+            {
+              service = "light.turn_off";
+              data = {
+                entity_id = light;
+              };
+            }
+          ];
+        }
+      ];
+      # default: on to off
+      # this works because state 0 checks for "state == off"
+      default = [{
+        service = "light.turn_off";
+        data = {
+          entity_id = light;
+        };
+      }];
+    };
+  };
 }
-- 
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