#!/usr/bin/env bash

PLAYLIST="$1"
COUNT="$2"

set -e

. "$HOME/.local/share/music/common.sh"

PLAYLIST_DIR="$MUSIC_DIR/Playlists"

function rand_num() {
  cat /dev/urandom | tr -dc '0-9' | head -c 10 | sed -e 's/^0*//'
}

function pick_song() {
  playlist="$1"

  playlist_path="$PLAYLIST_DIR/$playlist.pls"
  if [[ ! -f "$playlist_path" ]]
  then
    echo "ERROR: playlist $playlist not found" >&2
    exit 1
  fi

  songs="$(cat "$playlist_path" | grep '^file' | sed -e 's|^[^=]*=\.\./||')"

  num=$(( 1 + $(rand_num) % $(echo "$songs" | wc -l) ))
  song="$(echo "$songs" | sed "${num}q;d")"
  echo "$MUSIC_DIR/$song"
}

function shuffle() {
  playlist="$1"

  song="$(pick_song "$playlist")"
  song="$(music_get_song_info_from_file "$song")"
  song="$(music_process_genre "$song")"
  like=$(echo "$song" | jq '.likeLevel')
  mpd_path="$(echo "$song" | jq -rc '.path.mpd')"
  like_min=$(( -1 + $(rand_num) % 3 ))

  if [[ $like > $like_min ]]
  then
    echo "$like  $mpd_path"
    mpc add "$mpd_path"
  else
    shuffle "$playlist"
  fi
}

if [[ -z "$PLAYLIST" ]]
then
  PLAYLIST=all
fi

if [[ -z "$COUNT" ]]
then
  echo "add one song to que from $PLAYLIST"
  echo "$(shuffle $PLAYLIST)"
else
  echo "add $COUNT songs to que from $PLAYLIST"
  for i in $(seq 1 $COUNT)
  do
    echo "$(shuffle $PLAYLIST)"
    # echo $i
  done
fi