# --- Bandcamp ----------------------------------------------------------------

# bandcampdl <url>: download an album/track as MP3 (best quality) with
# metadata and cover art, sorted into Artist/Year - Album/
bandcampdl() {
    if [[ -z "$1" ]]; then
        echo "Usage: bandcampdl <bandcamp-url>"
        return 1
    fi

    yt-dlp \
        -x \
        --audio-format mp3 \
        --audio-quality 0 \
        --embed-metadata \
        --embed-thumbnail \
        --convert-thumbnails jpg \
        -o "%(album_artist)s/%(release_year)s - %(album)s/%(album_artist)s - %(album)s - %(track_number)02d - %(title)s.%(ext)s" \
        "$1"
}

# bandcampbatch <file>: run bandcampdl for every URL in a file
# (empty lines and lines starting with # are skipped)
bandcampbatch() {
    local file="$1" url

    if [[ ! -r "$file" ]]; then
        echo "Usage: bandcampbatch <url-file>"
        return 1
    fi

    while IFS= read -r url; do
        [[ -z "$url" || "$url" == \#* ]] && continue
        bandcampdl "$url"
    done < "$file"
}

# bandcamplist <https://band.bandcamp.com/music> [output.txt]:
# write all album/track URLs of an artist to a file
# (default: bandcamp-<band>.txt) - input for bandcampbatch
bandcamplist() {
    local url outfile tmpfile band count

    if (( ! $+commands[yt-dlp] )); then
        echo "Fehler: yt-dlp wurde nicht gefunden."
        return 1
    fi

    if (( $# < 1 || $# > 2 )); then
        echo "Usage:"
        echo "    bandcamplist <https://band.bandcamp.com/music> [output.txt]"
        return 1
    fi

    url="$1"

    # zsh stores capture groups of =~ in $match
    if [[ ! "$url" =~ ^https?://([^.]+)\.bandcamp\.com/music/?$ ]]; then
        echo "Fehler: Keine gueltige Bandcamp-/music-URL:"
        echo "    $url"
        return 1
    fi

    band="${match[1]}"
    outfile="${2:-bandcamp-${band}.txt}"
    tmpfile=$(mktemp)

    if ! yt-dlp --flat-playlist --print webpage_url "$url" | sort -u > "$tmpfile"; then
        rm -f "$tmpfile"
        echo "Fehler beim Abrufen der Links."
        return 1
    fi

    count=$(wc -l < "$tmpfile")

    if (( count == 0 )); then
        rm -f "$tmpfile"
        echo "Keine Album- oder Track-Links gefunden."
        return 1
    fi

    mv "$tmpfile" "$outfile"
    echo "✓ $count Links nach '$outfile' geschrieben."
}