#!/bin/bash

DB=/var/lib/navidrome/navidrome.db

no_cover_flag=.no_cover

cover_img=cover

mbz_agent='getCover/0.1 (https://seb.lautre.net/git/seb/scripts)'

test -e $0.conf && source $0.conf

coverartarchive_api="https://coverartarchive.org/release"

coverart=$(mktemp --dry-run /dev/shm/XXXXXXXX)

sizes=(small 250 500 large 1200)

ERROR   () { echo -e "\e[3;31m ${1:-erreur} \e[0;m"; }

OK      () { echo -e "\e[3;32m ${1:-OK} \e[0;m";     }

WARNING () { echo -e "\e[3;33m ${1:-alerte} \e[0;m"; }

sql_request () {

    sqlite3 $DB <<< "$1"

}

covered () {

    case "${forcing_level:-none}" in

        retry)

            if compgen -G "${album#*:}/$no_cover_flag" > /dev/null; then

                rm -f "${album#*:}/$no_cover_flag" 2>/dev/null

                return 1

            else

                return 0

            fi

            ;;

        force)

            return 1

            ;;

        none)

            compgen -G "${album#*:}/$cover_img.*" > /dev/null \

            || compgen -G "${album#*:}/$no_cover_flag" > /dev/null

            ;;

    esac

}

get_image () {

    if curl -Ls $1 > /dev/shm/$2; then

        mime_type=$(file -bn --mime-type /dev/shm/$2)

        if [[ ${mime_type:-erreur} =~ ^image/ ]]; then

            mv -f /dev/shm/$2 ${album#*:}/$cover_img.${2##*.} \

            && OK \

            || ERROR "échec en écriture"

        else

            WARNING "${album%%:*} type $mime_type"

        fi

    else

        ERROR "${album%%:*} échec du téléchargement"

    fi

}

if test -n "$spotifyID" -a -n "$spotifySecret"; then

    spotify_access_token=$(curl --silent \

        --request POST \

        --url https://accounts.spotify.com/api/token \

        --header 'Content-Type: application/x-www-form-urlencoded' \

        --header "Authorization: Basic $(base64 -w0 <<< $spotifyID:$spotifySecret | sed 's/K$/=/')" \

        -d 'grant_type=client_credentials' | jq -r '.access_token // empty')

    if test -z "$spotify_access_token"; then

        ERROR "problème d'identifant Spotify"

        echo ID: $spotifyID

        exit 1

    fi

fi

if declare -f pre_get_cover > /dev/null; then

    pre_get_cover

fi

IFS=$'\n'

for arg in $@; do

    if [[ $arg =~ ^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}:/ ]]; then

        albums[${#albums[@]}]=$arg

    elif [[ $arg =~ ^(force|retry)$ ]]; then

        forcing_level=$arg

    else

        WARNING "incohérence sur $arg"

    fi

done

if test ${#albums[@]} -eq 0; then

    albums=($(sql_request "select mbz_album_id || ':' || path

                           from media_file

                           where mbz_album_id is not ''

                           and path not like '/media/musique/la mule/%'

                           and has_cover_art = FALSE" | sed -r 's|/[^/]+$||' | sort -u))

fi

for album in ${albums[@]}; do

    if ! test -d "${album#*:}"; then

        WARNING "${album#*:}: chemin inconnu"

        continue

    fi

    if ! covered; then

        echo -n "${album#*:} "

        curl -Ls $coverartarchive_api/${album%%:*} > $coverart

        if test $(file -bn --mime-type $coverart) = application/json; then

            unset img

            for size in ${sizes[@]}; do

                img=$(jq -r '.images | .[] | select(.front == true) | .thumbnails | ."'$size'"?' $coverart 2>/dev/null)

                test -n "$img" && break

            done

            if test -n "$img"; then

                get_image "$img" "${album%%:*}.${img##*.}"

            fi

        elif test -n "$spotify_access_token"; then

            curl --user-agent "$mbz_agent" --silent \

                "https://musicbrainz.org/ws/2/release/${album%%:*}?fmt=json&inc=artists" > $coverart

            artist=$(jq -r '."artist-credit"? | .[0].name // empty' $coverart)

            if [[ ${artist:-__erreur__} = @(Various Artists|__erreur__) ]]; then

                unset artist

                WARNING "artiste inconnu ou multiples (compilation ?)"

                continue

            fi

            album_name=$(jq -r '.title' $coverart)

            if test -n "$album_name"; then

                curl --request GET --silent --show-error --http1.1 \

                    --header "Authorization: Bearer $spotify_access_token" \

                    --header 'Content-Type: application/json' \

                    --url "https://api.spotify.com/v1/search?type=album&query=album:${album_name// /%20}${artist:+%20artist:${artist// /%20}}" > $coverart

                found_albums=$(jq -r '.albums .total // empty' $coverart)

                if test ${found_albums:-0} -gt 0; then

                    img=$(jq --raw-output --arg artist "$artist" --arg album "$album_name" "

                            .albums .items

                            | .[]

                            | select(.name == \$album${artist:+ and (.artists | .[].name == \$artist)})

                            | .images

                            | .[]

                            | select(.height == 300)

                            | .url // empty" $coverart)

                    if test -n "$img"; then

                        get_image "$img" "${img##*/}.jpg"

                    else

                        touch "${album#*:}/$no_cover_flag" 

                        WARNING "${album%%:*} aucune image trouvée"

                    fi

                elif test ${found_albums:-1} -eq 0; then

                    WARNING "album indisponible sur spotify"

                else

                    WARNING "${found_albums:-NULL} albums trouvés sur spotify"

                    echo $artist

                    echo $album_name

                fi

            fi

        else

            touch "${album#*:}/$no_cover_flag" 

            WARNING "${album%%:*} aucune image trouvée"

        fi

    fi

done

rm -f $coverart 

if declare -f post_get_cover > /dev/null; then

    post_get_cover

fi