#!/usr/bin/env bash

PLAYLIST="$1"

set -e

SONGS="$(find $HOME/Music -type f)"
SONG_COUNT="$(echo "$SONGS" | wc -l)"

function pick_song() {
  num=$(( 1 + $RANDOM % $SONG_COUNT ))
  echo "$SONGS" | sed "${num}q;d"
}

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 in_playlist() {
  flags="$1"
  playlist="$2"

  playlists="
    ALL:(HE|ME|LE)
    HE:HE
    MHE:(ME|HE)
    ME:ME
    LME:(LE|ME)
    LO:LO
    LOFI:LOFI
    LE_LOFI:(LE|LOFI)
  "
  query="$(echo "$playlists" | grep --ignore-case " ${playlist}:" | sed 's/^.*://')"
  
  if [[ "$(echo "$flags" | grep -E --no-ignore-case "$query")" != "" ]]
  then
    echo true
  else
    echo false
  fi
}

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
  fi
}

function shuffle() {
  playlist="$1"

  song="$(pick_song)"
  flags="$(get_flags "$song")"
  in_list=$(in_playlist "$flags" "$playlist")
  like=$(get_like_level "$flags")
  like_min=$(( 1 + $RANDOM % 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
}

echo "$(shuffle $PLAYLIST)"