#!/bin/sh

FILENAME="$(echo "$*" | rev | cut -d' ' -f1 | rev)"

# check for flags
for i; do
  case "$i" in
    "-"*) unset ARTISTFLAG ALBUMFLAG SONGFLAG
      ;;
  esac
  [ -n "$ARTISTFLAG" ] && ARTISTNAME="$ARTISTNAME $i"
  [ -n "$ALBUMFLAG" ] && ALBUMNAME="$ALBUMNAME $i"
  [ -n "$SONGFLAG" ] && SONGNAME="$SONGNAME $i"
  [ -n "$TRACKFLAG" ] && TRACKNUMBER="$i" && unset TRACKFLAG
  [ -n "$YEARFLAG" ] && YEARNUMBER="$i" && unset YEARFLAG
  case "$i" in
    "-a")
      ARTISTFLAG="y"
      ;;
    "-A")
      ALBUMFLAG="y"
      ;;
    "-t")
      SONGFLAG="y"
      ;;
    "-T")
      TRACKFLAG="y"
      ;;
    "-y")
      YEARFLAG="y"
      ;;
  esac
done

ARTISTNAME="$(echo "$ARTISTNAME" | sed 's/^ //')"
ALBUMNAME="$(echo "$ALBUMNAME" | sed 's/^ //')"
SONGNAME="$(echo "$SONGNAME" | sed 's/^ //')"

printf "\n%s\n\n" "$FILENAME"

# guess artist name from title
ARTISTNAME_GUESS="$(echo "$FILENAME" | cut -d'-' -f1 | sed 's/_*$//;s/_/ /g')"

# guess album name from title
ALBUMNAME_GUESS="$(echo "$FILENAME" | cut -d'-' -f2 | sed 's/^_*//;s/_*$//;s/_/ /g')"

# guess track number from title
TRACKNUMBER_GUESS="$(echo "$FILENAME" | cut -d'-' -f3 | cut -d'_' -f2)"

# guess song name from title
SONGNAME_GUESS="$(echo "$FILENAME" | cut -d'-' -f3 | sed 's/^_[0-9]*_//;s/_/ /g;s/\.mp3$//;s/\.flac$//')"

# get the artist name input
[ -z "$ARTISTNAME" ] && printf "Input the Artist name:\nGuessed name is %s" "$ARTISTNAME_GUESS" && read -r ARTISTNAME
[ -z "$ARTISTNAME" ] && ARTISTNAME="$ARTISTNAME_GUESS"

echo "$ARTISTNAME"

# get the album name input
[ -z "$ALBUMNAME" ] && printf "Input the Album name:\nGuessed name is %s" "$ALBUMNAME_GUESS" && read -r ALBUMNAME
[ -z "$ALBUMNAME" ] && ALBUMNAME="$ALBUMNAME_GUESS"

echo "$ALBUMNAME"

# get the track number input
[ -z "$TRACKNUMBER" ] && printf "Input the track number:\nGuessed number is %s" "$TRACKNUMBER_GUESS" && read -r TRACKNUMBER
[ -z "$TRACKNUMBER" ] && TRACKNUMBER="$TRACKNUMBER_GUESS"

echo "$TRACKNUMBER"

# get the song name input
[ -z "$SONGNAME" ] && printf "Input the song name:\nGuessed name is %s" "$SONGNAME_GUESS" && read -r SONGNAME
[ -z "$SONGNAME" ] && SONGNAME="$SONGNAME_GUESS"

echo "$SONGNAME"

# get the year input
[ -z "$YEARNUMBER" ] && echo "Input the year number:" && read -r YEARNUMBER
[ -n "$YEARNUMBER" ] && mid3v2 -y "$YEARNUMBER" "$FILENAME"
# set tags for file
mid3v2 -a "$ARTISTNAME" -A "$ALBUMNAME" -t "$SONGNAME" -T "$TRACKNUMBER" "$FILENAME"