dotfiles/.local/bin/dl

#!/bin/sh

# Downloader
# Depends: aria2, youtube-dl

b=$(tput bold)
blue=$(tput setf 1)
red=$(tput setf 4)
u=$(tput smul)
n=$(tput sgr0)

help() {
	cat << EOF
${b}NAME${n}
	dl - Downloader

${b}SYNOPSIS${n}
	${b}dl${n} [${u}OPTION${n}...] [${u}URL${n}...]

${b}DESCRIPTION${n}
	${b}dl${n} Download audio/video with youtube-dl, using aria2, for each URL.

	A ${u}URL${n} of "${b}-${n}" stands for standard input.

${b}OPTIONS${n}
	${b}-h${n}	Display usage message and exit.

	${b}-a${n}	Download audio files from ${u}URL${n}.

	${b}-b${n}	Enable the best video quality.

	${b}-t${n}	Enable embedding of thumbnails into audio.

	${b}-v${n}	Download video files from ${u}URL${n}.
EOF
}

# Exit if no option is provided
[ "$#" -eq 0 ] && help && exit 1

script="$(basename "$0")"

# Option handling
while getopts ':h?abtv' opt; do
	case $opt in
		h)
			help
			exit 0
			;;
		a)
			audioDownload="true"
			;;
		b)
			videoBest="true"
			;;
		t)
			audioThumbnail="true"
			;;
		v)
			videoDownload="true"
			;;
		:)
			echo "$script: option requires an argument '$OPTARG'"
			echo "Try '$script -h' for more information."
			exit 1
			;;
		\?)
			echo "$script: invalid option '$OPTARG'"
			echo "Try '$script -h' for more information."
			exit 1
			;;
	esac
done

embedAudioThumbnail()
{
	# Get file name
	fileName="$(youtube-dl --get-filename "$1")"
	fileName="${fileName%.*}"

	# Convert thumbnail to actually be a jpg
	yes y | ffmpeg -i "${fileName}.webp" "${fileName}_converted.jpg" > /dev/null 2>&1
	yes y | ffmpeg -i "${fileName}.jpg" "${fileName}_converted.jpg" > /dev/null 2>&1

	# Embed thumbnail into mp3
	yes y | ffmpeg -i "${fileName}.mp3" -i "${fileName}_converted.jpg" \
				  -map 0:0 -map 1:0 -c copy -id3v2_version 3 \
				  -metadata:s:v title="Album cover" \
				  -metadata:s:v comment="Cover (front)" \
				  "${fileName}_embed.mp3" > /dev/null 2>&1

	# Remove left over files
	rm -f "./${fileName}_converted.jpg" "./${fileName}.jpg" "./${fileName}.mp3"
	mv "${fileName}_embed.mp3" "${fileName}.mp3"
}

downloadAudio()
{
	[ -z "$1" ] && return 1

	[ -n "$audioThumbnail" ] && thumbnail="--write-thumbnail"
	youtube-dl --format bestaudio/best \
			   --extract-audio --audio-format mp3 --audio-quality 0 $thumbnail \
			   --external-downloader aria2c \
			   --cookies "$HOME/documents/youtube.com-cookies.txt" "$1"
	[ -n "$audioThumbnail" ] && embedAudioThumbnail "$1"
}

downloadVideo()
{
	[ -z "$1" ] && return 1

	[ -z "$videoBest" ] && videoLimit="[height<=?1080]"
	youtube-dl --format "bestvideo${videoLimit}+bestaudio/best" \
			   --add-metadata \
			   --external-downloader aria2c \
			   --cookies "$HOME/documents/youtube.com-cookies.txt" "$1"
}

handleUrls()
{
	argumentUrls="$(echo "$@" | tr ' ' "\n")"
	urls="$(echo "$argumentUrls" | sed 's/^-$//')"
	[ "$argumentUrls" != "$urls" ] && urls="$(printf '%s\n%s' "$urls" "$(cat /dev/stdin)")"
	parsedUrls="$(echo "$urls" | sed -nE 's#^(https?://\S+\.\S+)$#\1#p')"
	[ "$urls" != "$parsedUrls" ] && printf '%sReceived invalid URL%s\n' "${b}${red}" "${n}" && exit 1
}

startDownloads()
{
	# Start downloads
	printf "%s::%s Downloading... %s \n" "${b}${blue}" "${n}${b}" "${n}"

	for url in $parsedUrls; do
		[ -n "$audioDownload" ] && downloadAudio "$url"
		[ -n "$videoDownload" ] && downloadVideo "$url"
	done
}

shift $((OPTIND - 1))
handleUrls "$@"
startDownloads