#!/usr/bin/env bash
# ┬┌─┬ ┬┌┐┌┌─┐┌┬┐
# ├┴┐│ ││││└─┐ │
# ┴ ┴└─┘┘└┘└─┘ ┴
# Created by Siddharth Dushantha
#
# Dependencies: sxiv, imagemagick, bash, ffmpeg, mpc, jq


VERSION=1.2.3
COVER=/tmp/kunst.png
MUSIC_DIR=~/Music/
SIZE=250x250
X=50
Y=50


show_help() {
	echo "usage: kunst [-h] [--size "px"] [--music_dir "path/to/dir"] [--silent] [--version]"
	echo " "
	echo "┬┌─┬ ┬┌┐┌┌─┐┌┬┐"
	echo "├┴┐│ ││││└─┐ │"
	echo "┴ ┴└─┘┘└┘└─┘ ┴"
	echo "Download and display album art or display embedded album art"
	echo " "
	echo "optional arguments:"
	echo "	 -h, --help						 show this help message and exit"
	echo "	 --size								 what size to display the album art in"
	echo "	 --x									 X"
	echo "	 --y									 Y"
	echo "	 --music_dir					 the music directory which MPD plays from"
	echo "	 --silent							 dont show the output"
	echo "	 --version						 show the version of kunst you are using"
}


# Parse the arguments
options=$(getopt -o h --long size:,x:,y:,music_dir:,version,silent,help -- "$@")
eval set -- "$options"

while true; do
		case "$1" in 
				--size)
						shift;
						SIZE=$1
						;;
				--x)
						shift;
						X=$1
						;;
				--y)
						shift;
						Y=$1
						;;
				--music_dir)
						shift;
						MUSIC_DIR=$1
						;;
				-h|--help)
				show_help
			exit
						;;
		--version)
				echo $VERSION
			exit
			;;
				--silent)
						SILENT=true
						;;
				--)
						shift
						break
						;;
		esac
		shift
done

# This is a base64 endcoded image which will be used if
# the file does not have an emmbeded album art.
# The image is an image of a music note
read -d '' MUSIC_NOTE << EOF
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
EOF


is_connected() {
	# Check if internet is connected. We are using api.deezer.com to test
	# if the internet is connected because if api.deezer.com is down or 
	# the internet is not connected this script will work as expected
	if ping -q -c 1 -W 1 api.deezer.com >/dev/null; then
		connected=true
	else
				if [ ! $SILENT ];then
						echo "kunst: unable to check online for the album art"
				fi
		connected=false
	fi
}


get_cover_online() {
	# Check if connected to internet
	is_connected

	if [ $connected == false ];then
		ARTLESS=true
		return
	fi

	# Try to get the album cover online from api.deezer.com
	API_URL="http://api.deezer.com/search/autocomplete?q=$(mpc current)" && API_URL=${API_URL//' '/'%20'}

	# Extract the albumcover from the json returned
	IMG_URL=$(curl -s "$API_URL" | jq -r '.playlists.data[0] | .picture_big')

	if [ "$IMG_URL" = '' ] || [ "$IMG_URL" = 'null' ];then
				if [ ! $SILENT ];then
						echo "error: cover not found online"
				fi
		ARTLESS=true
	else
				if [ ! $SILENT ];then
						echo "kunst: cover found online"
				fi
		curl -o $COVER -s $IMG_URL
		ARTLESS=false
	fi

}


update_cover() {
	# Extract the album art from the mp3 file and dont show the messsy
	# output of ffmpeg
	ffmpeg -i "$MUSIC_DIR$(mpc current -f %file%)" $COVER -y &> /dev/null

	# Get the status of the previous command
	STATUS=$?

	# killall n30f

	# Check if the file has a embbeded album art
	if [ $STATUS -eq 0 ];then
				if [ ! $SILENT ];then 
						echo "kunst: extracted album art"
				fi
		ARTLESS=false
	else
				DIR="$MUSIC_DIR$(dirname "$(mpc current -f %file%)")"
				if [ ! $SILENT ];then
						echo "kunst: inspecting $DIR"
				fi

		# Check if there is an album cover/art in the folder.
		# Look at issue #9 for more details
				for CANDIDATE in "$DIR/cover."{png,jpg}; do
						if [ -f "$CANDIDATE" ]; then
								STATUS=0
								ARTLESS=false
								convert "$CANDIDATE" $COVER
								if [ ! $SILENT ];then
										echo "kunst: found cover.png"
								fi
						fi
				done
		fi

	if [ $STATUS -ne 0 ];then
				if [ ! $SILENT ];then
						echo "error: file does not have an album art"
				fi
		get_cover_online
	fi

	# Resize the image to 250x250
	if [ $ARTLESS == false ]; then
		convert $COVER -resize $SIZE $COVER
				if [ ! $SILENT ];then
						echo "kunst: resized album art to $SIZE"
				fi
	fi

}

pre_exit() {
	# Get the proccess ID of kunst and kill it.
		# We are dumping the output of kill to /dev/null
		# because if the user quits sxiv before they
		# exit kunst, an error will be shown
		# from kill and we dont want that
	kill -9 $(cat /tmp/kunst.pid) &> /dev/null
}

main() {

	# Flag to run some commands only once in the loop
	FIRST_RUN=true

	while true; do

		update_cover
		# notify-send "Now Playing ♫" "$(mpc current)" &
		n30f -x $X -y $Y $COVER -t Kunst -c "killall n30f" &

		if [ $ARTLESS == true ];then
			# Dhange the path to COVER because the music note
			# image is a png not jpg
			COVER=/tmp/kunst.png

			# Decode the base64 encoded image and save it
			# to /tmp/kunst.png
			echo "$MUSIC_NOTE" | base64 --decode > $COVER
		fi
				
				if [ ! $SILENT ];then
						echo "kunst: swapped album art to $(mpc current)"
						printf '%*s\n' "${COLUMNS:-$(tput cols)}" '' | tr ' ' -
				fi

		if [ $FIRST_RUN == true ]; then
			FIRST_RUN=false

			# Display the album art using sxiv
			# sxiv -g $SIZE -b $COVER -N "Kunst" &

			# notify-send "Now Playing ♫" "$(mpc current)" &
			n30f -x $X -y $Y $COVER -t Kunst -c "killall n30f" &
			# Save the process ID so that we can kill
			# sxiv when the user exits the script
			echo $! >/tmp/kunst.pid
		fi

		# Waiting for an event from mpd; play/pause/next/previous
		# this is lets kunst use less CPU :)
		mpc idle &> /dev/null
				if [ ! $SILENT ];then
						echo "kunst: received event from mpd"
				fi
	done
}

# Disable CTRL-Z because if we allowed this key press,
# then the script would exit but, sxiv would still be
# running
trap "" SIGTSTP

trap pre_exit EXIT
main