From 914b88480ec5ebc41d6c6ea4c7c2dfe9e5bdaaa1 Mon Sep 17 00:00:00 2001
From: Ben Burwell <ben@benburwell.com>
Date: Wed, 23 May 2018 23:56:45 -0400
Subject: Initial commit

---
 .gitignore   |  1 +
 Makefile     |  2 ++
 colortemp.go | 11 +++++++++
 main.go      | 76 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 90 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 Makefile
 create mode 100644 colortemp.go
 create mode 100644 main.go

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..2b6a5ff
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+phlux
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..230b023
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,2 @@
+phlux: main.go colortemp.go
+	go build .
diff --git a/colortemp.go b/colortemp.go
new file mode 100644
index 0000000..d621043
--- /dev/null
+++ b/colortemp.go
@@ -0,0 +1,11 @@
+package main
+
+import (
+	"time"
+)
+
+type ColorTemperature uint
+
+func getDesiredColorTemperature(at time.Time) ColorTemperature {
+	return 1800
+}
diff --git a/main.go b/main.go
new file mode 100644
index 0000000..7636ad2
--- /dev/null
+++ b/main.go
@@ -0,0 +1,76 @@
+package main
+
+import (
+	"log"
+	"math"
+	"os"
+	"time"
+
+	hue "github.com/benburwell/gohue"
+)
+
+const username = "phlux"
+
+func main() {
+	bridges, err := hue.FindBridges()
+	if err != nil {
+		log.Fatalf("Error finding bridges: %s\n", err.Error())
+	}
+	log.Printf("Found %d bridge(s)\n", len(bridges))
+	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,
+					})
+				}
+			}
+		}
+	}
+}
+
+// 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)))
+}
-- 
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