#!/bin/bash

runtime="${XDG_RUNTIME_DIR}/i3blocks"
[[ ! -d "$runtime" ]] && mkdir -p "$runtime"

human_time() {
	local seconds="${1}"
	local minutes=$(( seconds / 60 ))
	local hours=$(( minutes / 60 ))
	minutes=$(( minutes % 60 ))
	printf "%d:%02d\n" "$hours" "$minutes"
	return
}

# Récupération des infos de la batterie

source /sys/class/power_supply/BAT1/uevent
time="$(date +%s)"

# Min et max personnalisés (20 et 80 % ici)
MIN="$(( POWER_SUPPLY_CHARGE_FULL * 2 / 10 ))"
MAX="$(( POWER_SUPPLY_CHARGE_FULL * 8 / 10 ))"

# Utiliser toute la plage de la batterie
#MIN=0
#MAX="$POWER_SUPPLY_CHARGE_FULL"

# %age réel
#percentage="$POWER_SUPPLY_CAPACITY"

# %age relatif aux MIN/MAX
percentage=$(( (POWER_SUPPLY_CHARGE_NOW - MIN) * 100 / (MAX - MIN) ))

# État de la batterie
status="$POWER_SUPPLY_STATUS"

# Indiquer la limite mise dans le BIOS, si la batterie n’indique pas qu’elle
# est chargée d’elle-même
if [[ "$status" == "Charging" && "$POWER_SUPPLY_CAPACITY" -eq 80 ]]
then
	status="Full"
fi

if [[ -f "${runtime}/bat" ]]
then
	mapfile -t old < "${runtime}/bat"
fi

# Estimation naïve du temps restant
if [[ "${old[0]}" != "$status" ]]
then
	printf "%s\n" "$status" "$time" "$POWER_SUPPLY_CHARGE_NOW" > "${runtime}/bat"
fi

if [[ "$status" == "Discharging" ]]
then
	remaining_secs="$(( (POWER_SUPPLY_CHARGE_NOW - MIN) / ((old[2] - POWER_SUPPLY_CHARGE_NOW) / (time - old[1])) ))"
elif [[ "$status" == "Charging" ]]
then
	remaining_secs="$(( (MAX - POWER_SUPPLY_CHARGE_NOW) / ((POWER_SUPPLY_CHARGE_NOW - old[2]) / (time - old[1])) ))"
else
	remaining_secs=0
fi

[[ "$remaining_secs" -lt 0 ]] && remaining_secs=0

remaining="$(human_time "$remaining_secs")"

# Définition des couleurs
dis_colors=("#F2777A" "#F2777A" "#F99157" "#F99157" "#FFCC66" "#FFCC66" "#99CC99" "#99CC99")
charging_color="#66CCCC"
ac_color="#6699CC"
full_color="#D3D0C8"

# Création de la barre « graphique », 48 états affichables

## à partir du pourcentage de calculé plus tôt

percents=$(( percentage / 2 ))
(( percents > 48 )) && percents=48

## à partir des données brutes
# percents=$(( (POWER_SUPPLY_CHARGE_NOW - MIN) * 48 / (MAX - MIN) ))

# Définition des symboles
chars=("█" "░" "░" "▒" "▒" "▓" "▓" "█")
#chars=("█" "▏" "▎" "▍" "▌" "▋" "▊" "▉")
#chars=("█" "▁" "▂" "▃" "▄" "▅" "▆" "▇")

full_squares=$(( percents / 8 ))
for t in $(seq 1 $full_squares)
do
        squares+="${chars[0]}"
done

squares+="${chars[$(( percents - ( full_squares * 8 ) ))]}"

# Complétion de la barre afin d'avoir une taille fixe
blanks=$(( 6 - ${#squares} ))
for t in $(seq 1 $blanks)
do
	squares+=" "
done

# Choix de la couleur
case "${status}" in
"Charging")
	color="$charging_color"
;;
"Full")
	color="$full_color"
;;
"AC")
	color="$ac_color"
;;
"Discharging"|"Unknown")
	if (( percentage < 10 )); then
		color="${dis_colors[0]}"
	elif (( percentage >= 10 && percentage < 20 )); then
		color="${dis_colors[1]}"
	elif (( percentage >= 20 && percentage < 30 )); then
		color="${dis_colors[2]}"
	elif (( percentage >= 30 && percentage < 40 )); then
		color="${dis_colors[3]}"
	elif (( percentage >= 40 && percentage < 60 )); then
		color="${dis_colors[4]}"
	elif (( percentage >= 60 && percentage < 70 )); then
		color="${dis_colors[5]}"
	elif (( percentage >= 70 && percentage < 80 )); then
		color="${dis_colors[6]}"
	elif (( percentage >= 80 )); then
		color="${dis_colors[7]}"
	fi
;;
esac

# Format détaillé en cas de clic
if [[ -n "$BLOCK_BUTTON" ]]
then
	message="<span foreground=\"$color\">${status} ${percentage}%</span> ${remaining}"
	message=${message% }
else
	message="<span foreground=\"$color\" background=\"#515151\">$squares</span> ${remaining}"
fi

# Affichage
echo "bat $message"
echo "bat <span foreground=\"$color\">${percentage}%</span>"
declare -p MIN MAX percents percentage >&2
