From 7f7d60ac3c99dee96184c22cc1bfd7cabc735e94 Mon Sep 17 00:00:00 2001
From: Simon Vieille <simon@deblan.fr>
Date: Sun, 7 Dec 2025 11:10:32 +0100
Subject: [PATCH] feat: add color delta checker to limit requests

---
 cmd/main.go                               | 15 ++++++++++++---
 go.mod                                    |  1 +
 go.sum                                    |  2 ++
 internal/{img/image.go => color/color.go} | 21 +++++++++++++++++++--
 internal/config/config.go                 |  6 ++++++
 internal/ha/client.go                     |  4 ++--
 6 files changed, 42 insertions(+), 7 deletions(-)
 rename internal/{img/image.go => color/color.go} (58%)

diff --git a/cmd/main.go b/cmd/main.go
index 2a70559..a163ade 100644
--- a/cmd/main.go
+++ b/cmd/main.go
@@ -5,9 +5,9 @@ import (
 	"os"
 	"time"
 
+	"gitnet.fr/deblan/ha-rgb-screen/internal/color"
 	"gitnet.fr/deblan/ha-rgb-screen/internal/config"
 	"gitnet.fr/deblan/ha-rgb-screen/internal/ha"
-	"gitnet.fr/deblan/ha-rgb-screen/internal/img"
 	"gitnet.fr/deblan/ha-rgb-screen/internal/screen"
 )
 
@@ -21,14 +21,23 @@ func main() {
 
 	s := screen.NewScreen(params)
 	client := ha.NewClient(params)
+	var lastValue color.RGB
 
 	for {
 		capture, err := s.Capture()
 
 		if err == nil {
-			if err := client.Update(img.GetRgbAverage(capture)); err != nil {
-				log.Println("Error: %s", err.Error())
+			newValue := color.GetRgbAverage(capture)
+			delta := color.Delta(newValue, lastValue)
+
+			if delta > params.Delta {
+				lastValue = newValue
+
+				if err := client.Update(newValue); err != nil && !params.Debug {
+					log.Printf("Error: %s\n", err.Error())
+				}
 			}
+
 		} else {
 			log.Fatalf("Fatal error: %s", err.Error())
 		}
diff --git a/go.mod b/go.mod
index 73c0784..a3053a2 100644
--- a/go.mod
+++ b/go.mod
@@ -8,6 +8,7 @@ require (
 	github.com/gen2brain/shm v0.1.0 // indirect
 	github.com/godbus/dbus/v5 v5.1.0 // indirect
 	github.com/jezek/xgb v1.1.1 // indirect
+	github.com/lucasb-eyer/go-colorful v1.3.0 // indirect
 	github.com/lxn/win v0.0.0-20210218163916-a377121e959e // indirect
 	golang.org/x/sys v0.24.0 // indirect
 )
diff --git a/go.sum b/go.sum
index 1322ea2..2a7839d 100644
--- a/go.sum
+++ b/go.sum
@@ -6,6 +6,8 @@ github.com/jezek/xgb v1.1.1 h1:bE/r8ZZtSv7l9gk6nU0mYx51aXrvnyb44892TwSaqS4=
 github.com/jezek/xgb v1.1.1/go.mod h1:nrhwO0FX/enq75I7Y7G8iN1ubpSGZEiA3v9e9GyRFlk=
 github.com/kbinani/screenshot v0.0.0-20250624051815-089614a94018 h1:NQYgMY188uWrS+E/7xMVpydsI48PMHcc7SfR4OxkDF4=
 github.com/kbinani/screenshot v0.0.0-20250624051815-089614a94018/go.mod h1:Pmpz2BLf55auQZ67u3rvyI2vAQvNetkK/4zYUmpauZQ=
+github.com/lucasb-eyer/go-colorful v1.3.0 h1:2/yBRLdWBZKrf7gB40FoiKfAWYQ0lqNcbuQwVHXptag=
+github.com/lucasb-eyer/go-colorful v1.3.0/go.mod h1:R4dSotOR9KMtayYi1e77YzuveK+i7ruzyGqttikkLy0=
 github.com/lxn/win v0.0.0-20210218163916-a377121e959e h1:H+t6A/QJMbhCSEH5rAuRxh+CtW96g0Or0Fxa9IKr4uc=
 github.com/lxn/win v0.0.0-20210218163916-a377121e959e/go.mod h1:KxxjdtRkfNoYDCUP5ryK7XJJNTnpC8atvtmTheChOtk=
 golang.org/x/sys v0.0.0-20201018230417-eeed37f84f13/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
diff --git a/internal/img/image.go b/internal/color/color.go
similarity index 58%
rename from internal/img/image.go
rename to internal/color/color.go
index 767ac0b..9401e26 100644
--- a/internal/img/image.go
+++ b/internal/color/color.go
@@ -1,6 +1,16 @@
-package img
+package color
 
-import "image"
+import (
+	"image"
+
+	"github.com/lucasb-eyer/go-colorful"
+)
+
+type XYZ struct {
+	X float64
+	Y float64
+	Z float64
+}
 
 type RGB struct {
 	R float64
@@ -8,6 +18,13 @@ type RGB struct {
 	B float64
 }
 
+func Delta(color1, color2 RGB) float64 {
+	c1 := colorful.Color{color1.R, color1.G, color1.B} // valeurs en [0..1], donc 1.0 = 255
+	c2 := colorful.Color{color2.R, color2.G, color2.B} // valeurs en [0..1], donc 1.0 = 255
+
+	return c1.DistanceCIE76(c2)
+}
+
 func GetRgbAverage(i *image.RGBA) RGB {
 	bounds := i.Bounds()
 
diff --git a/internal/config/config.go b/internal/config/config.go
index f3a5a33..4700908 100644
--- a/internal/config/config.go
+++ b/internal/config/config.go
@@ -6,7 +6,9 @@ type Config struct {
 	Url     string
 	Delay   int
 	Screen  int
+	Delta   float64
 	Verbose bool
+	Debug   bool
 	Usage   func()
 }
 
@@ -22,7 +24,9 @@ func GetConfig() *Config {
 	url := flag.String("url", "", "Webhook URL")
 	delay := flag.Int("delay", 500, "Delay in ms")
 	screen := flag.Int("screen", 0, "Screen index")
+	delta := flag.Float64("delta", 7.0, "Delta")
 	verbose := flag.Bool("v", false, "Verbose mode")
+	debug := flag.Bool("debug", false, "Debug mode (no http request)")
 
 	flag.Parse()
 
@@ -30,7 +34,9 @@ func GetConfig() *Config {
 		Url:     *url,
 		Delay:   *delay,
 		Screen:  *screen,
+		Delta:   *delta,
 		Verbose: *verbose,
+		Debug:   *debug,
 		Usage:   flag.Usage,
 	}
 }
diff --git a/internal/ha/client.go b/internal/ha/client.go
index 008eeb2..48d439a 100644
--- a/internal/ha/client.go
+++ b/internal/ha/client.go
@@ -6,8 +6,8 @@ import (
 	"log"
 	"net/http"
 
+	"gitnet.fr/deblan/ha-rgb-screen/internal/color"
 	"gitnet.fr/deblan/ha-rgb-screen/internal/config"
-	"gitnet.fr/deblan/ha-rgb-screen/internal/img"
 )
 
 type Client struct {
@@ -22,7 +22,7 @@ func NewClient(params *config.Config) *Client {
 	}
 }
 
-func (c *Client) Update(rgb img.RGB) error {
+func (c *Client) Update(rgb color.RGB) error {
 	data := fmt.Sprintf(`{"rgb": [%.0f, %.0f, %.0f]}`, rgb.R, rgb.G, rgb.B)
 
 	if c.params.Verbose {