#!/usr/bin/env bash

export DEFAULT_PLAYLIST_END=15
export DEFAULT_INC_STEP=10


download() {
  youtube-dl "$1" \
             --download-archive ~/Nextcloud/txt/youtube-dl-seen.conf \
             --prefer-free-formats \
             --playlist-end $2 \
             --output "~/Downloads/yt-dl/%(uploader)s/%(upload_date)s - %(title)s.%(ext)s"
}
export -f download


download_user() {
  download "https://www.youtube.com/user/$1" ${2-$DEFAULT_PLAYLIST_END}
}
export -f download_user


download_channel() {
  download "https://www.youtube.com/channel/$1" ${2-$DEFAULT_PLAYLIST_END}
}
export -f download_channel


download_playlist() {
  download "https://www.youtube.com/playlist?list=$1" ${2-$DEFAULT_PLAYLIST_END}
}
export -f download_playlist


inc_download() {
  local fn="$1"
  local id="$2"
  local step="${3-$DEFAULT_INC_STEP}"

  local file="$HOME/.yt-db/$id"
  local n_count="$(cat $file 2> /dev/null || printf 10)"
  local n_count_new="$(($n_count + $step))"

  echo "$n_count_new" > "$file"

  "$fn" "$id" "$n_count"
}

export -f inc_download