#!/usr/bin/env bash

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

set -e

PLAYLIST_DIR="$HOME/Music/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"
    exit 1
  fi

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

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

function get_flags() {
  path="$1"
  meuadata="flac"
  genre="$(ffmpeg -i "${path}" 2>&1 | grep GENRE | sed -e 's/^.*: //')"
  if [[ "$(echo "${path}" | sed -e 's/^.*\.\([^\.]*\)$/\1/')" == "mp3" ]]
  then
    metadata="mp3"
    genre="$(id3v2 -l "${path}" | grep '^TCON' | sed -e 's/^.*: //')"
  fi
  echo $genre
}

function get_like_level() {
  flags="$1"

  level="$(echo "$flags" | sed -e 's/^.*L\([0-3]\).*$/\1/')"
  if [[ "$level" == "$(echo "$level" | tr -dc '0-3')" ]]
  then
    echo $level
  else
    echo 2 # default like level
  fi
}

function shuffle() {
  playlist="$1"

  song="$(pick_song "$playlist")"
  flags="$(get_flags "$song")"
  like=$(get_like_level "$flags")
  like_min=$(( 1 + $(rand_num) % 3 ))

  if [[ "$in_list" == "false" || "$like" -lt "$like_min" ]]
  then
    shuffle "$playlist"
  else
    mpd_song="$(echo "$song" | sed -e 's|.*/Music/||')"
    echo "$mpd_song"
    mpc add "$mpd_song"
  fi
}

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

# pick_song "$PLAYLIST"

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