package main

import (
    "bytes"
    "fmt"
    "math/rand"
    "net/http"
    "sync"
    "time"
)

func setLight(lightID int) {
    url := fmt.Sprintf("http://192.168.1.23/api/fqaj6KtOHPSNpPzTzFy4g5rce98CIf2uAFlXbViH/lights/%d/state", lightID)

    for {
        rand.Seed(time.Now().UnixNano())
        hue := rand.Intn(65535)
        fmt.Printf("Light %d - hue: %d\n", lightID, hue)
        str := fmt.Sprintf(`{"on":true, "sat":254, "bri":100,"hue":%d}`, hue)
        jsonStr := []byte(str)
        req, err := http.NewRequest("PUT", url, bytes.NewBuffer(jsonStr))

        client := &http.Client{}
        resp, err := client.Do(req)
        if err != nil {
            panic(err)
        }

        defer resp.Body.Close()
        time.Sleep(time.Millisecond * 600)
    }
}

func main() {

    lights := [...]int{1, 3, 6}

    var wg sync.WaitGroup
    wg.Add(len(lights))

    for _, i := range lights {
        go func(lightID int) {
            setLight(lightID)
            wg.Done()
        }(i)
        time.Sleep(time.Millisecond * 200)
    }
    wg.Wait()
}