ISS Fade Light Controller Script

#!/bin/bash

# Title: ISS Fade Light Controller Script
#
# Abstract: This Bash script is designed for home automation systems and
# controls a Philips Hue light to simulate the International Space Station
# (ISS) passing overhead. The script prevents multiple instances from
# running simultaneously. It sets up a logging system in a specified
# directory, where it records the details of each operation. The script
# contains key functions: 'iss_fade' for adjusting the light's brightness,
# 'iss_color' for changing the light's color, and 'iss_start' for
# initiating the light sequence. It takes two parameters: the duration of
# the light effect and the start time, to align with the ISS's visible
# pass. The script incrementally increases the light's brightness to
# simulate the ISS's approach, changes the color to signify the ISS at its
# brightest, and then gradually dims the light, emulating the ISS moving
# away, finally turning the light off. This script provides a unique and
# interactive way to experience ISS passes using home lighting systems.
#
# hue lights are controlled by
# https://github.com/bahamas10/hue-cli

# Wenn das Programm schon laeuft, dann direkt abbrechen. Kein Logfile beschreiben.
current_pid=$$
# Prüfen, ob das Programm bereits läuft (ohne die aktuelle Instanz)
if pgrep -f "iss-fader.sh" | grep -qv "^$current_pid\$"; then
    echo "Programm wartet bereits auf einen Start. Abbruch."
    exit 1
fi



## DEBUG
# Der Basispfad, unter dem der neue Ordner erstellt werden soll
base_path="/var/log/"

# Generieren der aktuellen Epoch-Zeit
epoch_time=$(date +%s)
jetzt=$(date -d @"$epoch_time" '+%d.%m., %H:%M:%S Uhr')

# Vollständiger Pfad für den neuen Ordner
new_folder="${base_path}1/"

# Erstellen des neuen Ordners
#mkdir -p "$new_folder"

echo "bash /volume1/web/iss-fader.sh" > "${new_folder}/script.log"
echo "Debug iss-fader.sh" > "${new_folder}/output.log"
## DEBUG


# Funktionen
iss_fade() {
    echo "iss_fade($level)" >> "${new_folder}/output.log"
    level=$1
    if [[ $level -eq 0 ]]; then
        /usr/local/bin/hue -H 192.168.0.90 lights 3 off >> "${new_folder}/output.log" 2>&1
    else
        /usr/local/bin/hue -H 192.168.0.90 lights 3 =$level% >> "${new_folder}/output.log" 2>&1
    fi
}

iss_color() {
    echo "iss_color($color)" >> "${new_folder}/output.log"
    color=$1
    /usr/local/bin/hue -H 192.168.0.90 lights 3 $color >> "${new_folder}/output.log" 2>&1
}

iss_start() {
    echo "iss_start()" >> "${new_folder}/output.log"
    /usr/local/bin/hue -H 192.168.0.90 lights 3 on >> "${new_folder}/output.log" 2>&1
    /usr/local/bin/hue -H 192.168.0.90 lights 3 =1% >> "${new_folder}/output.log" 2>&1
}
# Funktionen


# Parameter übernehmen
dauer="$1"
aufgang="$2"
start=$(date -d @"$aufgang" '+%d.%m., %H:%M:%S Uhr')

echo "ISS Fade mit $dauer Sekunden um $aufgang" >>"${new_folder}/output.log"

# Warten bis zum ISS Aufgang
echo "Aktuelle Zeit: $jetzt" >> "${new_folder}/output.log"
echo "Schlafe bis:   $start"  >> "${new_folder}/output.log"
echo "...zzz..."  >> "${new_folder}/output.log"
sleep $((aufgang - $(date +%s)))
echo "Aufgewacht. $(date +%s)" >> "${new_folder}/output.log"

stufen=20    # Anzahl Helligkeitsstufen
dim=10       # Starthelligkeit
dimstep=10   # Erhöhung pro Stufe in Prozent

intervall=$((dauer / stufen))
fade=false

# Anfangs an und auf gelb
iss_start
sleep 1
iss_color "00ffff"
sleep 1

for ((i=1; i<=stufen; i++)); do
    iss_fade $dim
    sleep $intervall

    # Volle Helligkeit erreicht, Farbe auf orange
    if [[ $dim -ge 100 ]]; then
        fade=true
        iss_color "ff8500"
    fi

    # Zunehmend oder abnehmend
    if [ "$fade" = false ]; then
        dim=$((dim + dimstep))
    else
        dim=$((dim - dimstep))
    fi
done

# Ende, Lampe aus
iss_fade 0
echo >> "${new_folder}/output.log"