preview() {
    yay -Syy && yay -Qu
    [[ -x /usr/bin/flatpak ]] && flatpak remote-ls --updates
}

flatpak-update() {
    TMP="/tmp/update"
    DATE="$(date +"%Y-%m-%dT%H:%M:%S%:z")"
    BACKUP_LOCATION="/opt"

    [[ -d $TMP ]] && rm --recursive --force "$TMP"
    mkdir --parents "$TMP"/before-backup_"$DATE" "$TMP"/after-backup_"$DATE"

    flatpak list --all --show-details > "$TMP"/before-backup_"$DATE"/flatpak-before.txt
    tar --create --zstd --file "$TMP"/before-backup_"$DATE".tar.zst "$TMP"/before-backup_"$DATE"

    flatpak update --assumeyes

    flatpak list --all --show-details > "$TMP"/after-backup_"$DATE"/flatpak-after.txt
    tar --create --zstd --file "$TMP"/after-backup_"$DATE".tar.zst "$TMP"/after-backup_"$DATE"

    rsync -a "$TMP"/before-backup_"$DATE".tar.zst "$TMP"/after-backup_"$DATE".tar.zst "$BACKUP_LOCATION"

    rm --recursive --force "$TMP"
}

update () {
    yay
    flatpak-update
}