#!/bin/sh

#shellcheck disable=SC2030,SC2031,SC2059

help() {
	case $1 in
		search*)
			name="search_play"
			args='"search_query"'
			description="this function first searches the $args, then opens the menu(fzf,[d|be]menu,[t|r|w]ofi) with the results,then calls the play function to play the music"
			;;
		play)
			name="play"
			args='"valid_youtube_url_or_id"'
			description="immediately plays the $args in mpv(audio only)"
			;;
		loop)
			name="loop"
			args='"print"'
			description="this function runs in a loop to play the next music if the current music is successfully finished
			this function should be put as background process or put it in startup
			passing print argument will show the progress to stdout"
			;;
		play*)
			name="play_next"
			args='"menu"'
			description="immediately plays the next song stored in $logdir/next file in mpv if argument is empty
			passing $args argument will show the $args(fzf,[d|be]menu,[t|r|w]ofi) for selecting what should be played"
			;;
		*)
			name="[ <function_name> ]"
			args="[ <function_arg> ]"
			description="
			<function_name>	<function_arg>	<function_description>

			search_play	search_query	searches first then plays the music in mpv
			play		youtube_url	plays the music in mpv
			play_next	menu(optional)	plays the next music in $logdir/next file
			loop		print(optional)	plays the next music after the current is finished (run it as background process)

			tip:
			type ${0##*/} help <function_name> to get individual help
			"
			;;
	esac
	while read -r line; do
		printf "%s\n" "$line"
	done <<-EOF

		Usage :
		${0##*/} $name $args

		Description :
		$description
	EOF
	exit 0
}

cleanup_shit(){
	pkill -f "nc -U $discord_ipc" > /dev/null
	rm -rdf "$logdir"
	exit 0
}

get_cookies() {
	for i in $(sqlite3 "$HOME/.config/google-chrome/Default/Cookies" "SELECT name,REPLACE(base64(SUBSTR(encrypted_value,4)),CHAR(10),'') FROM cookies WHERE host_key='.youtube.com';")
	do 
		printf "%s=%s; " "$(printf '%s' "$i" | cut -d'|' -f1)" "$(printf '%s' "$i" | cut -d'|' -f2 | base64 -d | openssl enc -d -aes-128-cbc -K fd621fe5a2b402539dfa147ca9272778 -iv 20202020202020202020202020202020)" 
	done > "$cookie"
}

get_data() {
	grep -q "SAPISID" "$logdir/cookies" 2>/dev/null && sapisid_header="Authorization: SAPISIDHASH $(printf '%s_%s' "$(date +%s)" "$(printf '%s %s %s' "$(date +%s)" "$(sed -nE 's|.*SAPISID=([^;]*);.*|\1|p' "$logdir/cookies")" "$base_url" | sha1sum | cut -d' ' -f1)")" || sapisid_header=""
	curl -X POST -A "${3:-$agent}" -s "$base_url/youtubei/v1/$1?key=${4:-AIzaSyC9XL3ZjWddXya6X74dJoCTL-WEYFDNX30}&prettyPrint=false" -H "content-type:application/json" -d "$2" -b "$(cat "$cookie")" -e "$base_url" -H "$sapisid_header"
}

get_music_list(){
	json_next="{
	\"enablePersistentPlaylistPanel\": true,
	\"tunerSettingValue\": \"AUTOMIX_SETTING_NORMAL\",
	\"playlistId\": \"RDAMVM$(cat "$logdir/start")\",
	\"index\": $(cat "$logdir/counter"),
	\"params\": \"wAEB\",
	$([ -e "$logdir/continue_token" ] && cat "$logdir/continue_token")
	\"isAudioOnly\": true,
	\"context\": $(cat "$logdir/context")
	}"
	next_data=$(get_data "next" "$json_next" | sed 's/playlistPanelVideoRenderer/\n/g;s/hasPersistentPlaylistPanel/\n/g' | sed -nE 's|.*text":"(.*)"}.*longBylineText":\{"runs":\[\{"text":"([^"]*)","navigationEndpoint.*videoId":"([^"]*)".*|\1 - \2\t\3|p;s|.*nextRadioContinuationData":\{([^,]*).*|\1,|p')
	printf '%s' "$next_data" | sed -e "$(cut -f2 "/tmp/yt-music/next" | sed 's|^|/|g;s|$|/d|g')" -e '/"continuation"/d' >> "$logdir/next"
	printf '%s' "$next_data" | sed -n '/"continuation"/p' > "$logdir/continue_token"
}

get_song_lyrics() {
	json_next="{
	\"enablePersistentPlaylistPanel\": true,
	\"tunerSettingValue\": \"AUTOMIX_SETTING_NORMAL\",
	\"playlistId\": \"RDAMVM$(cat "$logdir/start")\",
	\"index\": $(cat "$logdir/counter"),
	\"videoId\": \"$1\",
	\"isAudioOnly\": true,
	\"context\": $(cat "$logdir/context")
	}"

	browseId=$(get_data "next" "$json_next" | sed -nE 's|.*"browseId":"(MPLYt[^"]*)".*TRACK_LYRICS.*|\1|p')
	if [ -n "$browseId" ]; then
		json_lyrics="{
		  \"context\": {
		    \"client\": {
		      \"clientName\": \"ANDROID_MUSIC\",
		      \"clientVersion\": \"$andy_yt_ver\",
		      \"androidSdkVersion\": $(( random_no + extra_up + 29 )),
		      \"userAgent\": \"$droid_agent\",
		      \"hl\": \"en\",
		      \"timeZone\": \"UTC\",
		      \"utcOffsetMinutes\": 0
		    }
		  },
		  \"browseId\": \"$browseId\"
  		}"
		get_data "browse" "$json_lyrics" "$droid_agent" "AIzaSyAOghZGza2MQSZkY_zfZ370N-PUdXEo8AI" | sed 's/metadata"/\n/g' | sed -nE 's|.*lyricLine":"([^"]*)","cueRange".*"endTimeMilliseconds":"([^"]*)".*|\2\t\1|p' > "$logdir/lyrics"
	fi
}

loop() {
	#this function does exactly what it says, it should run in the background
	#it plays next song after the current song get played completely,it does nothing until u run the search_play function then this code kicks in
	trap cleanup_shit INT HUP TERM
	socat - "UNIX-CONNECT:$socket" | while read -r event;do
		#look for eof event
		if printf "%s" "$event" | grep -q "end-file.*eof";then
			i=$(cat "$logdir/counter")
			: $((i+=1))
			pgrep -f "$socket" >/dev/null || continue
			[ -n "$(cat "$logdir/next")" ]
			play "$(sed -n "$((i+=1))p" "$logdir/next")" "$1"
			printf '%s' "$i" > "$logdir/counter"
			tail -1 "$logdir/next" | grep -q "$(cut -d'>' -f2 < "$logdir/current")" && get_music_list
		fi
	done
	cleanup_shit
}

#discord rich presence written in a nut-shell code
set_activity() {
	op=0
	handshake='{"v":1,"client_id":"'$presence_client_id'"}'
	datalen=${#handshake}
	for i in $(seq 0 3); do
		byte=$(((op >> (i * 8)) & 255))
		printf "\\$(printf "%03o" "$byte")"
	done
	for i in $(seq 0 3); do
		byte=$(((datalen >> (i * 8)) & 255))
		printf "\\$(printf "%03o" "$byte")"
	done
	printf "%s" "$handshake"
	op=1
	datalen=${#1}
	for i in $(seq 0 3); do
		byte=$(((op >> (i * 8)) & 255))
		printf "\\$(printf "%03o" "$byte")"
	done
	for i in $(seq 0 3); do
		byte=$(((datalen >> (i * 8)) & 255))
		printf "\\$(printf "%03o" "$byte")"
	done
	printf "%s" "$1"
}

update_rich_presence() {
	pkill -f "nc -U $discord_ipc" > /dev/null
	sleep 2
	title=$1
	id=$2
	start=$(date +%s)
	dur=$(printf '{ "command": ["get_property", "duration"] }\n' | socat - "$socket" | sed -nE 's|.*data":([^.]*).*|\1|p')
	payload='{"cmd": "SET_ACTIVITY", "args": {"activity": {"details": "'$(printf "%s" "$title" | sed 's|[^-]*$||;s|-$||;s| $||;s|^ ||')'", "state": "'$(printf "%s" "$title" | sed 's_.* - __;s| $||')'", "timestamps": {"start": '"$start"',"end": '"$((start + dur))"'}, "assets": {"large_image": "https://i.ytimg.com/vi/'$id'/mqdefault.jpg","large_text":"Checkmate Premium Users"}}}, "nonce": "1"}'

	#with buttons, but this MF is not working --
	#payload='{"cmd": "SET_ACTIVITY", "args": {"activity": {"details": "'$(printf "%s" "$title" | sed 's|[^-]*$||;s|-$||;s| $||;s|^ ||')'", "state": "'$(printf "%s" "$title" | sed 's_.* - __;s| $||')'", "timestamps": {"start": '"$(date +%s)"'}, "assets": {"large_image": "https://i.ytimg.com/vi/'$id'/mqdefault.jpg","large_text":"Checkmate Premium Users","buttons": [{"label":"Listen Here", "url": "https://www.youtube.com/watch?v='$id'"}]}}}, "nonce": "1"}'
	set_activity "$payload" | nc -U "$discord_ipc"
}

play() {
	#this function does all the heavy lifting of extracting url from given videoId
	#it's also callable, u can use this function to play ur custom youtube URLs
	title=$(printf "%s" "$1" | cut -f1)
	id=$(printf "%s" "$1" | cut -f2 | cut -d"=" -f2 | cut -d"/" -f4 | cut -d'&' -f1)
	[ -z "$id" ] && printf "[ youtube ] Invalid link\n" && exit 1

	#get song's audio url
	random_no=$(head /dev/urandom | tr -dc '0-4' | cut -c1)
	andy_yt_ver="6.22.51"
	extra_up=$((random_no >= 2))
	droid_agent="com.google.android.apps.youtube.music/$andy_yt_ver (Linux; U; Android 1$random_no) gzip"
	json="{
	  \"context\": {
	    \"client\": {
	      \"clientName\": \"ANDROID_MUSIC\",
	      \"clientVersion\": \"$andy_yt_ver\",
	      \"androidSdkVersion\": $(( random_no + extra_up + 29 )),
	      \"userAgent\": \"$droid_agent\",
	      \"hl\": \"en\",
	      \"timeZone\": \"UTC\",
	      \"utcOffsetMinutes\": 0
	    }
	  },
	  \"videoId\": \"$id\",
	  \"playbackContext\": {
	    \"contentPlaybackContext\": {
	      \"html5Preference\": \"HTML5_PREF_WANTS\"
	    }
	  },
	  \"contentCheckOk\": true,
	  \"racyCheckOk\": true
	}"

	audio_url=$(get_data "player" "$json" "$droid_agent" "AIzaSyAOghZGza2MQSZkY_zfZ370N-PUdXEo8AI" | sed -nE 's_.*itag":251,"url":"([^"]*)".*_\1_p')
	[ -z "$audio_url" ] && return 0
	if [ -n "$2" ]; then
		printf "Name >> %s\n" "$title"
		printf "videoID >> %s\n" "$id"
		printf "Audio URL >> %s\n" "$audio_url"
	fi

	curl -s "https://i.ytimg.com/vi/$id/hqdefault.jpg" -o - | convert - -crop 270x270+105+45 "$logdir/default.jpg" && notify-send -h "string:x-canonical-private-synchronous:${0##*/}" -i "$logdir/default.jpg" "Now Playing" "$title" -t 5000
	pgrep -f "$socket" >/dev/null || (setsid -f mpv --really-quiet --input-ipc-server="$socket" --idle --quiet >/dev/null && sleep 1)
	printf '{"command":["loadfile","%s","replace"]}\n' "$audio_url" | socat - "$socket"
	printf "currently playing : %s >%s\n" "$title" "$id" >"$logdir/current"

	#self explainatory
	get_song_lyrics "$id" &

	#update the discord rich presence, requires client id
	update_rich_presence "$title" "$id" &

	#next songs data
	[ -n "$3" ] && get_music_list &

	pgrep -f "${0##*/} loop" >/dev/null || setsid -f "$0" loop
}

search_play() {
	#run this if u r starting the script first time like this
	#call this by "script-name" "search_play" [ search_query | youtube_id by prefixing with ID:<youtube_id> | youtube url ]
	[ -z "$1" ] && query=$(: | menu "Yt-music [Search]:" "" "60") || query="$1"
	[ -z "$query" ] && notify-send "Err.. Search query empty" -u critical -h "string:x-canonical-private-synchronous:${0##*/}" && exit 1

	#storing context
	printf '{"client":{"clientName":"WEB_REMIX","clientVersion":"1.20231010.05.00"}}' >"$logdir/context"

	if ! (printf '%s' "$query" | grep -q 'https:' || printf '%s' "$query" | grep -q 'ID:');then
	#json for song search
		json_search="{
		\"context\" : $(cat "$logdir/context"),
		\"query\": \"$query\",
		\"params\": \"EgWKAQIIAWoKEAMQBBAJEAoQBQ%3D%3D\"
		}"

		res=$(get_data "search" "$json_search" "$agent" | sed 's/watchEndpoint"/\n/g' | sed -nE 's_.*videoId":"([^"]*)",.*label":"Play ([^"]*)".*_\2\t\1_p' | menu "Yt-music [Play]:")
	else
		id=$(printf '%s' "$query" | cut -d':' -f2 | cut -d"=" -f2 | cut -d"/" -f4 | cut -d'&' -f1)
		title=$(curl -s "https://www.youtube.com/oembed?url=http://www.youtube.com/watch?v=$id&format=xml" | sed -nE 's|.*<title>([^<]*)<.*|\1|p' | sed 's|&amp;|\&|g')
		res=$(printf '%s\t%s' "$title" "$id")

	fi

	#extracting your cookies so that the song list are according to your taste
	get_cookies
	printf '' > "$logdir/next"
	printf "%s\n" "$res" >> "$logdir/next"
	printf "%s" "$res" | cut -f2 > "$logdir/start"
	printf "0" > "$logdir/counter"
	rm -f "$logdir/continue_token"
	[ -z "$res" ] || play "$res" "verbose" "1"
}

play_next() {
	#call this by script-name "play_next" for playing next song immediately
	#or add "menu" after "play_next" to show menu for selecting and playing next song immediately
	#like this script-name "play_next" "menu"
	pgrep -f "$socket" || return 0
	i=$(cat "$logdir/counter")
	if [ -z "$1" ]; then 
		: $((i+=1))
		play "$(sed -n "$((i+=1))p" "$logdir/next")" "$1"
	else
		notify-send -h "string:x-canonical-private-synchronous:${0##*/}" -i "$logdir/default.jpg" "$(cut -d">" -f1 "$logdir/current" | tr ':' '\n')"
		next=$(nl -n'ln' -v0 "$logdir/next" | sed "s/^$i /& /" | menu "YT-music [play-next]: " "$i")
		[ -z "$next" ] && return 0
		i=$(printf '%s' "$next" | sed 's///g' | cut -f1 | tr -d ' ')
		play "$(printf '%s' "$next" | cut -f2-)" "verbose"
	fi
	printf '%s' "$i" > "$logdir/counter"
	tail -1 "$logdir/next" | grep -q "$(cut -d'>' -f2 < "$logdir/current")" && get_music_list
}

menu() {
	bemenu --fn 'IBM Plex Sans 15' -i -c -W 0.5 -B 3 -p "$1" -l 25 -I "${2:-0}" -P ">>" 
}

logdir="/tmp/${0##*/}"
socket="$logdir/${0##*/}-mpvsocket"
discord_ipc="${XDG_RUNTIME_DIR}/discord-ipc-0"
presence_client_id="1165951947245879316"
base_url="https://music.youtube.com"
[ -d "$logdir" ] || mkdir "$logdir"
cookie="$logdir/cookies"
agent="Mozilla/5.0 (X11; Linux x86_64; rv:109.0) Gecko/20100101 Firefox/116.0"

#call this script by script-name "function_name" "query"
[ -z "$1" ] && help "$@"
$1 "$2" "$3"