#!/bin/bash
# Prints media info from mpd, youtube, pandora

# Priority:
# 1. Prints the title of the mpd song playing, while scrolling (WORK IN PROGRESS)
# 2. Prints the title of the first open YouTube window, while scrolling (sexy!)
# NOTE: It works if the tab is in focus, so seperate the youtube tab from 
# the rest of the browser so you don't have to keep it in focus and the script will work.
# 3. Prints "Pandora Radio" if there is a browser window with pandora open (same principle as above)

# Note: on tint2, set interval=0 and continuous output=2 or larger
# (in general continuous output should be larger than sleep time)

# TODO: start from the beginning if the output has changed (if the song has changed)

# Another way
# b=${a:12:5}
# (where 12 is the offset (zero-based) and 5 is the length)

# Limit for scrolling text
LIMIT=26
#SEPERATOR=" --- "
#SEPERATOR=" -- "
#SEPERATOR=" ~~~ "
SEPERATOR=" ~~ "
#SEPERATOR=" <> "
SEPERATOR_LENGTH="$(echo ${#SEPERATOR})"

# for multibyte chars (idk if it works): 
# iconv -sc -t UTF-8 -f cp1251
# tr -dc '[:print:]'

i=1
while :
do  
	# For debugging purposes
	# printf "|%02d|" $i
	
	# Seach for ncmpcpp, youtube and pandora windows
	MPDSTATE="$(mpc | head -2 | tail -1 | awk '{print $1}')"
	#NCMPCPP="$(ps cax | grep ncmpcpp)"
	YOUTUBE="$(wmctrl -l | grep -v "wmctrl" | grep -m 1 "YouTube")"
	PANDORA="$(wmctrl -l | grep -v "wmctrl" | grep -m 1 "Pandora Radio")"

	# Grab youtube window title 
	# Depending on your browser, uncomment the correct INPUT line (and comment the others)

	# Vivaldi
	#if [ ${#NCMPCPP} -eq "0" ] && [[ "$MPDSTATE" = "[paused]" ]]; then
	if [[ "$MPDSTATE" != "[playing]" ]]; then
		# Grab youtube window title 
		# Depending on your browser, uncomment the correct INPUT line (and comment the others)
		# Vivaldi
		#INPUT="$(echo $YOUTUBE | awk -v skipstart=3 -v skipend=2 '{delim = ""; for (i=skipstart+1;i<=NF-skipend;i++) {printf delim "%s", $i; delim = OFS};}')"
	
		# Mozilla
		INPUT="$(echo $YOUTUBE | awk -v skipstart=3 -v skipend=3 '{delim = ""; for (i=skipstart+1;i<=NF-skipend;i++) {printf delim "%s", $i; delim = OFS};}')"
	
		# Chromium/Mozilla
		# INPUT="$(echo $YOUTUBE | awk -v skipstart=3 -v skipend=4 '{delim = ""; for (i=skipstart+1;i<=NF-skipend;i++) {printf delim "%s", $i; delim = OFS};}')"
	else
		INPUT="$(mpc | head -1)"
	fi

	# If the song has changed, start from the beginning and send a notification
	if [[ "$INPUT" != "$OLD_INPUT" ]]; then
		i=1
		if [ ${#INPUT} -ne "0" ]; then
			notify-send " Now playing:" "$INPUT"
		fi
	fi

	# Save old input for the next check
	OLD_INPUT="$(echo $INPUT)"

	# Optional: remove multibyte characters 
	# (they dont show up properly while scrolling due to "cut -c" being identical to "cut -b")
	INPUT="$(echo $INPUT | tr -dc '[:print:]')"

	INPUT_LENGTH="$(echo ${#INPUT})"

	# If no youtube window is found (+pandora)
	#if [ ${#YOUTUBE} -eq "0" ] && [ ${#NCMPCPP} -eq "0" ]; then
	if [ ${#YOUTUBE} -eq "0" ] && [[ "$MPDSTATE" != "[playing]" ]]; then
		if [ ${#PANDORA} -eq "0" ]; then
			#echo "  "
			#echo "  "
			#echo "  "
			#echo "  "
			echo " "
		else
			echo "  Pandora Radio"
		fi
	elif [ $INPUT_LENGTH -le $LIMIT ]; then
		# Song has a smaller title than the limit, so no need to scroll.
		echo -n "  "
		#echo -e -n "$INPUT"

		#Justify - left
		#SPACES=$(($LIMIT-$INPUT_LENGTH+1+1))
		#echo -n "$INPUT" | awk -v spaces=$SPACES '{printf "%s%*.s\n", $0, spaces, " "}'

		#Justify - center
		SPACES_AFTER=$(($LIMIT-$(((${#INPUT}+$LIMIT)/2))))
		printf "%*s\n" $(((${#INPUT}+$LIMIT)/2 + 1)) "$INPUT" | awk -v spaces=$SPACES_AFTER '{printf "%s%*.s\n", $0, spaces, " "}'

	else
		LOOPTAIL="$(echo $INPUT | cut -c -$LIMIT)"
		FULLSTRING="$(echo "$INPUT""$SEPERATOR""$LOOPTAIL")"
		#FULLSTRING="$(echo $INPUT | sed "s/$/$SEPERATOR/" | sed "s/$/$LOOPTAIL/" )"


		# This is to prevent the bug when song changes and current i is larger than current song length
		# (Not needed anymore, this bug was fixed differently)
		# if [ $i -gt "${#FULLSTRING}" ]; then
		# 	i=1
		# fi

		echo -n "  "
		# Show only LIMIT characters, from i to i+LIMIT. Output scrolls due to incrementing i
		echo -n $FULLSTRING | cut -c $i-$(($LIMIT+$i))
		#echo -n $FULLSTRING | awk -v charlimit="$LIMIT" -v start="$i" '{print substr($0,start,charlimit)}'

		# If we have shown the full string, start over
		if [ $i -eq $(($INPUT_LENGTH+$SEPERATOR_LENGTH)) ]; then
			i=0
		fi


		i=$(($i+1))
	fi

	# For fat bars/panels, I add this newline so the previous output is not visible
	echo ""

	sleep 1
done

# general method to exlude fields
# awk -v skipstart=1 -v skipend=1 '{delim = ""; for (i=skipstart+1;i<=NF-skipend;i++) {printf delim "%s", $i; delim = OFS}; printf "\n"}'