From 307a3802dc7c9637b9b3a1a95ff47c0686fa1a01 Mon Sep 17 00:00:00 2001
From: Ben Burwell <ben@benburwell.com>
Date: Thu, 24 May 2018 21:24:24 -0400
Subject: Move all CT functionality into colortemp.go

---
 main.go | 82 ++++++++++++++++++++++++-----------------------------------------
 1 file changed, 30 insertions(+), 52 deletions(-)

(limited to 'main.go')

diff --git a/main.go b/main.go
index 7636ad2..481f712 100644
--- a/main.go
+++ b/main.go
@@ -2,7 +2,6 @@ package main
 
 import (
 	"log"
-	"math"
 	"os"
 	"time"
 
@@ -17,60 +16,39 @@ func main() {
 		log.Fatalf("Error finding bridges: %s\n", err.Error())
 	}
 	log.Printf("Found %d bridge(s)\n", len(bridges))
+	desiredColorTemp := getDesiredColorTemperature(time.Now())
 	for _, bridge := range bridges {
 		log.Printf("Bridge: %s\n", bridge.IPAddress)
-		//username, err := bridge.CreateUser(username)
-		//if err != nil {
-		//	panic("Could not create user on bridge")
-		//}
-		//fmt.Printf("Made user %s for bridge %s\n", username, bridge.IPAddress)
-		err = bridge.Login(os.Getenv("HUE_LOGIN"))
-		if err != nil {
-			log.Fatalf("Could not log in to bridge: %s", err.Error())
-		}
-		log.Println("Logged in to bridge")
-		lights, err := bridge.GetAllLights()
-		if err != nil {
-			log.Fatalf("Error getting lights: %s\n", err.Error())
-		}
-		log.Printf("Found %d lights\n", len(lights))
-		for _, light := range lights {
-			log.Printf("Light %d: %s (%s)\n", light.Index, light.Name, light.Type)
-			if supportsColorTemp(light) {
-				log.Printf("  CT range: %d-%d\n", light.Capabilities.Control.CT.Min, light.Capabilities.Control.CT.Max)
-				if light.Index == 8 {
-					newCt := translateCtForLight(getDesiredColorTemperature(time.Now()), light)
-					log.Printf("  Setting CT to %d\n", newCt)
-					light.SetState(hue.LightState{
-						On: light.State.On,
-						CT: newCt,
-					})
-				}
-			}
-		}
+		updateBridge(bridge, desiredColorTemp)
 	}
 }
 
-// Determine whether there is a non-zero color temperature range for the given light
-func supportsColorTemp(l hue.Light) bool {
-	return l.Capabilities.Control.CT.Max > l.Capabilities.Control.CT.Min
-}
-
-// Translate a desired color temperature in Kelvins to a value comprehensible
-// by a Hue luminaire. According to Hue documentation, the value 153
-// corresponds to 6500K, and 500 corresponds to 2000K. Using these known
-// values, we'll create a mapping between spaces, and additionally limit the
-// resulting value by the range that the luminaire supports.
-//
-//   153 <=> 6500K
-//   500 <=> 2000K
-//   =============
-//   347     4500
-func translateCtForLight(ct ColorTemperature, light hue.Light) uint16 {
-	divisor := 12.968
-	scaled := float64(ct) / divisor
-	inverted := 500 - scaled + 153
-	min := float64(light.Capabilities.Control.CT.Min)
-	max := float64(light.Capabilities.Control.CT.Max)
-	return uint16(math.Max(min, math.Min(max, inverted)))
+func updateBridge(bridge hue.Bridge, desiredColorTemp ColorTemperature) {
+	//username, err := bridge.CreateUser(username)
+	//if err != nil {
+	//	panic("Could not create user on bridge")
+	//}
+	//fmt.Printf("Made user %s for bridge %s\n", username, bridge.IPAddress)
+	err := bridge.Login(os.Getenv("HUE_LOGIN"))
+	if err != nil {
+		log.Fatalf("Could not log in to bridge: %s", err.Error())
+	}
+	log.Println("Logged in to bridge")
+	lights, err := bridge.GetAllLights()
+	if err != nil {
+		log.Fatalf("Error getting lights: %s\n", err.Error())
+	}
+	log.Printf("Found %d lights\n", len(lights))
+	for _, light := range lights {
+		log.Printf("Light %d: %s (%s)\n", light.Index, light.Name, light.Type)
+		if supportsColorTemp(light) {
+			log.Printf("  CT range: %d-%d\n", light.Capabilities.Control.CT.Min, light.Capabilities.Control.CT.Max)
+			newCt := translateCtForLight(desiredColorTemp, light)
+			log.Printf("  Setting CT to %d\n", newCt)
+			light.SetState(hue.LightState{
+				On: light.State.On,
+				CT: newCt,
+			})
+		}
+	}
 }
-- 
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