#!/bin/bash


########################################################
# Get data from spotify api                            #
########################################################
sudo rm -rf _temp && mkdir _temp && cd _temp;

pwd && ls

FILE=../playlist.json
if [ -f "$FILE" ]; then
    echo "$FILE exists."
    cp ../playlist.json ./
else 
    echo "$FILE does not exist"
    ID=APPLICATION_ID
    TOKEN=TOKEN_HERE
    curl -X "GET" "https://api.spotify.com/v1/playlists/$ID/tracks" \
	-H "Accept: application/json" \
	-H "Content-Type: application/json" \
	-H "Authorization: Bearer $TOKEN" > playlist.json
fi

########################################################
# Create temporary text files                          #
########################################################
pwd && ls

# Release dates
cat playlist.json | jq -r ".items[].track.album.release_date" > release_dates.txt

# Artists
cat playlist.json | jq -r ".items[].track.album.artists[0].name" > artists.txt

# Images
cat playlist.json | jq -r ".items[].track.album.images[0].url" > images.txt

# Album artists
cat playlist.json | jq -r ".items[].track.album.artists[0].name" > album_artists.txt

# Track names
cat playlist.json | jq -r ".items[].track.name" > names.txt

# Track numbers
cat playlist.json | jq -r ".items[].track.track_number" > track_numbers.txt

# Albums
cat playlist.json | jq -r ".items[].track.album.name" > albums.txt

############################################################

SONG_COUNT=$(wc -l names.txt | awk '{ print $1 }');

############################################################
# Define line function                                     #
############################################################

function line(){
    sed "$1q;d" "$2";
}

function silent(){
    `$@ >/dev/null 2>&1`
}
############################################################
# Iterate over lines of files                              #
############################################################

# TODO: add song count again
for ((i=1;i<=$SONG_COUNT;i++)); do
    sudo rm -rf *.mp3
    
    NAME=$(line "$i" names.txt)
    TRACK_NUM=$(line "$i" track_numbers.txt)
    ARTIST=$(line "$i" artists.txt)
    IMAGE=$(line "$i" images.txt)
    ALBUM_ARTIST=$(line "$i" album_artists.txt)
    ALBUM=$(line "$i" albums.txt)
    # Get release year
    RELEASE_DATE=$(line "$i" release_dates.txt | cut -d "-" -f1)
    echo "Downloading song $i/$SONG_COUNT: $NAME ($RELEASE_DATE)"
    
    sudo youtube-dl \
	--quiet \
	-f bestaudio \
	-x \
	--audio-format mp3 \
	-o "_$NAME.mp3" \
	"ytsearch1:$NAME $ARTIST $ALBUM $RELEASE_DATE"
   pwd && ls
   echo "Adding metadata to $NAME"
   
   sudo ffmpeg -i "_$NAME.mp3" \
	-hide_banner -loglevel error \
	-nostdin -y \
	-c:a libmp3lame \
	-metadata "title=$NAME" \
	-metadata "artist=$ARTIST" \
	-metadata "album_artist=$ALBUM_ARTIST" \
	-metadata "album=$ALBUM" \
	-metadata "year=$RELEASE_DATE" \
	-metadata "date=$RELEASE_DATE" \
	-metadata "track=$TRACK_NUM" \
	"__$NAME.mp3" 
   
   echo "Adding cover image to $NAME"
   sudo ffmpeg -i "__$NAME.mp3" \
	-hide_banner -loglevel error \
	-nostdin \
	-y \
	-i $IMAGE \
	-c:a copy \
	-c:v copy -map 0:0 -map 1:0 -id3v2_version 3 \
	-metadata:s:v title="Album cover" \
	-metadata:s:v comment="Cover (front)" "$NAME.mp3"
  sudo rm "__$NAME.mp3"
  sudo rm "_$NAME.mp3"
  sudo mv "$NAME.mp3" ../
done

sudo rm *.txt;
mv playlist.json ../
cd ../