#!/bin/bash -x

# Fonction de réinitialisation en cas de perte de la connexion
self-reset() {
	echo "<span foreground=\"#515151\">[--:-- --:-- --:--]</span>"
	sleep 5
	exec "$0"
}

trap self-reset PIPE

# Initialisation de la connexion au serveur
coproc nc -U /home/breizh/.mpd/socket
IN=${COPROC[1]}
OUT=${COPROC[0]}
#echo "password xxx" >&${IN}
sed '/^OK/q' <&$OUT &>/dev/null 

# Initialisation des valeurs par défaut et des fonctions
declare -i SCROLL=50 I=0
declare -- artist song oldfile

human_time() {
	local seconds="$1"
	if [[ "$seconds" -lt 0 ]]
	then
		echo "--:--"
		return
	fi
	local minutes=$(( $seconds / 60 ))
	seconds=$(( $seconds % 60 ))
	if [[ "$minutes" -ge 60 ]]
	then
		local hours=$(( $minutes / 60 ))
		minutes=$(( $minutes % 60 ))
		printf "%02dh%02d\n" "$hours" "$minutes"
	else
		printf "%02d:%02d\n" "$minutes" "$seconds"
	fi
	return
}

# Initialisation de l’état
echo "status" >&$IN
while read -t 1 -u $OUT output
do
	[[ "$output" == "OK" ]] && break
	o[${output%%:*}]="${output##*: }"
done

# Boucle principale
while [[ -n "$COPROC_PID" ]]
do
	# Gestion du clic, fait office de délai si aucune action (une seconde).
	# En cas de clic, l’actualisation de l’affichage sera instantanné.
	read -t 1 BLOCK_BUTTON
	
	case $BLOCK_BUTTON in
		1|3) [[ "${o["state"]}" == stop ]] \
			&& echo "play" >&${IN} \
			&& sed '/^OK$/q' <&$OUT &>/dev/null \
			|| self-reset ;;&
		2) [[ "${o["state"]}" == stop ]] \
			&& echo "play" >&${IN} \
			|| echo "pause" >&${IN} \
			|| self-reset ;;&
		1) echo "previous" >&${IN} || self-reset ;;&
		3) echo "next" >&${IN} || self-reset ;;&
		1|2|3) sed '/^OK$/q' <&$OUT &>/dev/null ;;
	esac
	
	# Réinitialisation de l’état
	unset o
	declare -A o
	
	# Récupération de l’état
	echo "status" >&$IN || self-reset
	while read -t 1 -u $OUT output
	do
		[[ "$output" == "OK" ]] && break
		o[${output%%:*}]="${output##*: }"
	done
	
	# Récupération des informations du morceau en cours
	echo "currentsong" >&$IN || self-reset
	while read -t 1 -u $OUT output
	do
		[[ "$output" == "OK" ]] && break
		o[${output%%:*}]="${output##*: }"
	done

	# Choix des couleurs selon l’état
	case "${o["state"]}" in
		play ) status="<span foreground=\"#99CC99\">" ;;
		pause ) status="<span foreground=\"#FFCC66\">" ;;
		stop ) status="<span foreground=\"#F2777A\">" ;;
	esac


	# En cas de changement de morceau,
	# on réinitialise l’affichage défilant
	if [[ "${o["file"]}" != "$oldfile" ]]
	then
		unset bloc1 bloc2 bloc3 bloc4
		artist="${o["Artist"]:-${o["Name"]}}"
		song="${o["Title"]}"
		[[ -z "$artist$song" ]] && song="$(basename "${o["file"]}")"

		if [[ "$(( ${#song} + ${#artist} + 1 ))" -gt "$SCROLL" ]]
		then
			scroll=true
			song=" $song     "
		else
			scroll=false
			song=" $song"
		fi
		
		bloc1="$artist"
		bloc2="$song"

		oldfile="${o["file"]}"
		I=0
	fi

	# Gestion du défilement
	if "$scroll"
	then
		unset bloc1 bloc2 bloc3 bloc4
		declare -- bloc1 bloc2 bloc3 bloc4
		bloc1="${artist:$I:$SCROLL}"
		if [[ "${#bloc1}" -eq 0 ]]
		then
			bloc2="${song:$(( I - ${#artist} )):$SCROLL}"
			if [[ "$(( ${#bloc1} + ${#bloc2} ))" -lt "$SCROLL" ]]
			then
				bloc3="${artist:0:$(( SCROLL - ${#bloc2} ))}"
				if [[ "$(( ${#bloc1} + ${#bloc2} + ${#bloc3} ))" -lt "$SCROLL" ]]
				then
					bloc4="${song:0:$(( SCROLL - ${#bloc1} - ${#bloc2} - ${#bloc3} ))}"
				fi
			fi
		else
			bloc2="${song:0:$(( SCROLL - ${#bloc1} ))}"
			if [[ "$(( ${#bloc1} + ${#bloc2} ))" -lt "$SCROLL" ]]
			then
				bloc3="${artist:0:$(( SCROLL - ${#bloc2} - ${#bloc1} ))}"
			fi
		fi

		I+=1
		[[ "$I" -ge "$(( ${#artist} + ${#song} ))" ]] && I=0
	fi

	# Gestion du temps
	time_elapsed=$(human_time "${o["time"]%:*}")
	time_total=$(human_time "${o["time"]#*:}")
	time_left=$(human_time "$(( ${o["time"]#*:} - ${o["time"]%:*} ))")

	time="[${time_elapsed:---:--} ${time_left:---:--} ${time_total:---:--}]"

	# DEBUG
	printf '<b>%s</b>%s<b>%s</b>%s%s\n' "$bloc1" "$bloc2" "$bloc3" "$bloc4" " $status$time</span>"
done
done