#!/bin/bash

# Plaiter -- front end to mpg123 et al
#
# Copyright (C) 2005, 2006 Stephen Jungels
# 
#

# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.  
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# General Public License for more details.
#
# See COPYING for the full text of the license.
#
# See README.plaiter for supported platforms and installation
# instructions.
#
# To contact the author: sjungels@gmail.com

usage ()
{
  echo "Usage is:"
  echo "  \"plaiter [options] [file, playlist, directory or stream ...]\""
  echo "Options:"
  echo "  --daemon,-d      -- daemon mode"
  echo "  --queue,-q       -- add tracks to queue"
  echo "  --enqueue        -- add tracks to queue"
  echo "  --random         -- random shuffle"
  echo "  --play           -- play"
  echo "  --pause          -- toggle pause mode"
  echo "  --stop,-s        -- stop"
  echo "  --latch [on|off] -- toggle or set stop after current track"
  echo "  --next,-n [n]    -- skip forward [n tracks]"
  echo "  --prev [n]       -- skip backward [n tracks]"
  echo "  --search <str>   -- search in playlist"
  echo "  --rsearch <str>  -- reverse search in playlist"
  echo "  --reset,-r       -- play track 1"
  echo "  --loop [on|off]  -- toggle or set loop mode"
  echo "  --quit           -- quit daemon"
  echo "  --status         -- show status"
  echo "  --list,-l        -- show playlist"
  echo "  --help           -- show help"
  echo "  --version        -- show version"
  echo "  -v               -- be verbose"
}


version ()
{
  echo "Plaiter v 1.4.1"
  echo "Written by Stephen Jungels (sjungels@gmail.com)"
  echo ""
  echo "Copyright (c) 2005, 2006 by Stephen Jungels.  Released under the GPL."
  echo "Latest version and more info at http://jungels.net/projects/plait/"
}


maybe_install ()
{
  mkdir -p "$HOME/.plait"
  if ! test -f "$HOME/.plait/helpers" || test $INSTALL -gt 0
  then
    echo Detecting helper applications...
    rm -f "$HOME/.plait/helpers"
    touch "$HOME/.plait/helpers"
    ogg=`which ogg123 2>/dev/null`
    if ! test "-$ogg-" = "--"
    then
      echo "ogg:ogg123" >> "$HOME/.plait/helpers"
      echo "httpogg:ogg123" >> "$HOME/.plait/helpers"
      echo "flac:ogg123" >> "$HOME/.plait/helpers"
    fi
    mpg=`which mpg123-esd 2>/dev/null`
    if ! test "-$mpg-" = "--"
    then
      echo "mp3:mpg123-esd" >> "$HOME/.plait/helpers"
      echo "httpmp3:mpg123-esd" >> "$HOME/.plait/helpers"
      echo "http:mpg123-esd" >> "$HOME/.plait/helpers"
    else
      mpg=`which mpg123 2>/dev/null`
      if ! test "-$mpg-" = "--"
      then
        echo "mp3:mpg123" >> "$HOME/.plait/helpers"
        echo "httpmp3:mpg123" >> "$HOME/.plait/helpers"
        echo "http:mpg123" >> "$HOME/.plait/helpers"
      else
        mpg=`which mpg321 2>/dev/null`
        if ! test "-$mpg-" = "--"
        then
          echo "mp3:mpg321" >> "$HOME/.plait/helpers"
          echo "httpmp3:mpg321" >> "$HOME/.plait/helpers"
          echo "http:mpg321" >> "$HOME/.plait/helpers"
        fi
      fi
    fi
    echo Wrote $HOME/.plait/helpers
  fi

  if ! test -f "$HOME/.plait/key.awk" || test $INSTALL -gt 0
  then
    cat > "$HOME/.plait/key.awk" <<EOF
{
  n = split (\$0, protocol, "://");
  if (n > 1) {
    mime = protocol[1];
    n = split (\$0, suffix, ".");
    if (suffix[n]=="mp3" || suffix[n]=="ogg") {
      mime = mime suffix[n];
    }
  } else {
    n = split (\$0, suffix, ".");
    mime = suffix[n];
  }
  print mime
}
EOF
  fi
}


next_track ()
{
  if test "-$1-" = "--"
  then
    jump=1
  else
    jump=$1
  fi
  maxindex=`cat "$HOME/.plait/plaiter.m3u" | wc -l`
  j2=`expr $jump % $maxindex`
  if test $j2 -ne 0
  then
    track=`expr $listindex + $j2`
    if test $track -gt $maxindex
    then
      if test $loopmode = 0
      then
        track=$maxindex
      else
        track=`expr $track % $maxindex`
      fi
    fi
  else
    track=$listindex
  fi
}


prev_track ()
{
  if test "-$1-" = "--"
  then
    jump=1
  else
    jump=$1
  fi
  maxindex=`cat "$HOME/.plait/plaiter.m3u" | wc -l`
  j2=`expr $jump % $maxindex`
  if test $j2 -ne 0
  then
    track=`expr $listindex - $j2`
    if test $track -lt 1
    then
      if test $loopmode = 0
      then
        track=1
      else
        track=`expr $maxindex + $track`
      fi
    fi
  else
    track=$listindex
  fi
}


play_current_song ()
{
  while true
  do
    song=`cat "$HOME/.plait/plaiter.m3u" | awk "{if (FNR==$listindex) print}"`
    if ! test "-$song-" = "--"
    then
      key=`echo "$song" | awk -f "$HOME/.plait/key.awk"`
      HELPER=`cat "$HOME/.plait/helpers" | awk -v key=$key \
        'BEGIN{FS=":"}{if (tolower($1)==tolower(key)) {print $2; exit}}'`

      if ! test "-$HELPER-" = "--"
      then
        $HELPER "$song" &
        playerpid=$!
        HELPERNAME=`echo "$HELPER" | awk '{print $1}'`  
        if test $VERBOSE -gt 0
        then
          echo Ran command $HELPER $song
          echo "playerpid = $playerpid"
          echo helpername = $HELPERNAME
        fi
        break
      else
        if test $VERBOSE -gt 0
        then
          echo "I don't have a helper for the key $key"
        fi
        next_track
        if test $listindex = $track
        then
          paused=1
          break
        else
          listindex=$track
        fi
      fi
    else
      if test $VERBOSE -gt 0
      then
        echo No current song
      fi
      paused=1
      break
    fi
  done
}


handle_interrupt ()
{
  # if HELPER exited, restart it on the next track
  if test $paused = 0 && ! test $playerpid = 0 
  then
    tries=0
    while true
    do
      ps -p $playerpid > /tmp/ps.$$
      foo=`grep "$HELPERNAME" /tmp/ps.$$`
      if test "-$foo-" = "--"
      then
        if test $VERBOSE -gt 0
        then
          echo Did not find $HELPERNAME
          echo Selecting next track
        fi
        playerpid=0
  
        next_track
        if test $listindex = $track
        then
          if test $VERBOSE -gt 0
          then
            echo Reached end of playlist
          fi
          paused=1
        else
          listindex=$track
          if test $stoplatch = 0
          then
            play_current_song
          else
            stoplatch=0
            paused=1
          fi
        fi
        break
      else
        if test $tries -ge 1
        then
          if test $VERBOSE -gt 0
          then
            echo Found $HELPERNAME, giving up after second try
          fi
          break
        else
          if test $VERBOSE -gt 0
          then
            echo Found $HELPERNAME, trying again
          fi
          tries=`expr $tries + 1`
          sleep 1
        fi
      fi
    done
  fi
}


maybe_kill_player ()
{
  if ! test $playerpid = 0
  then
    kill -9 >/dev/null 2>&1 $playerpid
    playerpid=0
    return 1
  else
    return 0
  fi
}


do_quit ()
{
  maybe_kill_player
  rm -f $HOME/.plait/pdaemon
  exit 0
}


write_status ()
{
  if test -e "$HOME/.plait/plaiter.m3u"
  then
    numtracks=`cat "$HOME/.plait/plaiter.m3u" | wc -l`
    song=`cat "$HOME/.plait/plaiter.m3u" | awk "{if (FNR==$listindex) print}"`
  else
    numtracks = 0
    song = ""
  fi
  if test $playerpid = 0
  then
    status="STOPPED on track $listindex of $numtracks"
  elif test $paused = 1
  then
    status="PAUSED on track $listindex of $numtracks"
  else
    status="PLAYING track $listindex of $numtracks"
  fi
  if test $loopmode = 1
  then 
    status="$status -- Loop on"
  fi
  if test $stoplatch = 1
  then 
    status="$status -- Latch on"
  fi
  echo $status > "$HOME/.plait/status"
  echo $song >> "$HOME/.plait/status"
}


daemon_mode ()
{
  if test -e "$HOME/.plait/pdaemon"
  then
    echo Daemon seems to be running
    sleep 3 &
    echo nop > "$HOME/.plait/pdaemon"
    if test $? = 0
    then
      kill $!
      echo Yes, it is running, exiting
      exit 1
    else
      echo No response from daemon, cleaning up
      rm "$HOME/.plait/pdaemon"
    fi
  fi
  mkfifo "$HOME/.plait/pdaemon"

  trap "echo Got SIGINT, cleaning up; do_quit" INT

  stoplatch=0
  loopmode=0
  playerpid=0
  listindex=1
  paused=1
  while true
  do
    write_status
    while true
    do
      read cmd args < $HOME/.plait/pdaemon
      if test $? -ne 0
      then
        if test $VERBOSE -gt 0
        then
          echo Got interrupt
        fi
        handle_interrupt
        write_status
      else
        break
      fi
    done
    if test $VERBOSE -gt 0
    then
      echo Read command $cmd
    fi
    case "$cmd" in
      play)
        if test $playerpid = 0
        then
          play_current_song
          paused=0
        elif test $paused = 1
        then
          paused=0
          kill -s CONT $playerpid
        fi
      ;;

      pause)
        if ! test $playerpid = 0
        then
          if test $paused = 0
          then
            paused=1
            kill -s STOP $playerpid
            if test $VERBOSE -gt 0
            then
              echo Pausing
            fi
          else
            paused=0
            kill -s CONT $playerpid
            if test $VERBOSE -gt 0
            then
              echo Unpausing
            fi
          fi
        fi

      ;;

      stoplatch)
        if test "-$args-" = "-on-"
        then
          stoplatch=1
        elif test "-$args-" = "-off-"
        then
          stoplatch=0
        elif test $stoplatch = 0
        then
          stoplatch=1
        else
          stoplatch=0
        fi
        if test $VERBOSE -gt 0
        then
          echo Setting stop latch: $stoplatch
        fi

      ;;

      stop)
        maybe_kill_player
        if test $? = 1
        then
          paused=1
          if test $VERBOSE -gt 0
          then
            echo Stopping
          fi
        fi

      ;;

      next)
        maybe_kill_player
        if test $? = 1
        then
          next_track $args
          if test $track = $listindex
          then
            paused=1
          else
            listindex=$track
            play_current_song
          fi
        else
          next_track $args
          listindex=$track
        fi
        if test $VERBOSE -gt 0
        then
          echo New track: $listindex
        fi

      ;;

      prev)
        maybe_kill_player
        if test $? = 1
        then
          prev_track $args
          if test $listindex = $track
          then
            paused=1
          else
            listindex=$track
            play_current_song
          fi
        else
          prev_track $args
          listindex=$track
        fi
        if test $VERBOSE -gt 0
        then
          echo New track: $listindex
        fi

      ;;


      search)
        track=`cat "$HOME/.plait/plaiter.m3u" | awk -v a="$args" -v li=$listindex \
        '{if (tolower($0) ~ tolower(a) && (track==0 || (track<=li && FNR > li)) && FNR!=li) track=FNR}END{print track}'`
        if ! test $track = 0
        then
          maybe_kill_player
          listindex=$track
          if test $VERBOSE -gt 0
          then
            echo New track: $listindex
          fi
          play_current_song
        fi

      ;;


      rsearch)
        track=`cat "$HOME/.plait/plaiter.m3u" | awk -v a="$args" -v li=$listindex \
        '{if (tolower($0) ~ tolower(a) && (FNR<li || track==0 || track>li) && FNR!=li) track=FNR}END{print track}'`
        if ! test $track = 0
        then
          maybe_kill_player
          listindex=$track
          if test $VERBOSE -gt 0
          then
            echo New track: $listindex
          fi
          play_current_song
        fi

      ;;


      reset)
        maybe_kill_player
        listindex=1
        paused=0
        stoplatch=0
        play_current_song
        if test $VERBOSE -gt 0
        then
          echo New track: $listindex
        fi

      ;;

      loop)
        if test "-$args-" = "-on-"
        then
          loopmode=1
        elif test "-$args-" = "-off-"
        then
          loopmode=0
        elif test $loopmode = 0
        then
          loopmode=1
        else
          loopmode=0
        fi
        if test $VERBOSE -gt 0
        then
          echo Setting loop mode: $loopmode
        fi

      ;;

      quit)
        if test $VERBOSE -gt 0
        then
          echo Quitting
        fi
        do_quit

      ;;

      nop)

      ;;

      *)
        if test $VERBOSE -gt 0
        then
          echo Ignoring unknown command $cmd
        fi

      ;;

    esac
  done
}


start_daemon ()
{
  if test $VERBOSE -gt 0
  then
    echo Starting daemon
  fi
  plaiter --daemon > /dev/null 2>&1 &
  # pause a moment to let the daemon start up
  for i in 1 2 3 4; do for j in 1 2 3 4; do echo > /dev/null; done; done
  while true
  do
    if test -e "$HOME/.plait/pdaemon"
    then
      break
    fi
    sleep 1
  done
}


controller_mode ()
{
  if test $QUEUE = 0 && ! test "-$1-" = "--"
  then
    rm -f "$HOME/.plait/plaiter.m3u"
  fi
  rm -f "$HOME/.plait/plaiter0.m3u" 

  while test $# -gt 0
  do
    if test $VERBOSE -gt 0
    then
      echo Adding $1 to playlist
    fi
    if test -d "$1"
    then
      odir="`pwd`"
      cd "$1"
      dir="`pwd`"
      cd "$odir"
      find "$dir" -type f | sort >> "$HOME/.plait/plaiter0.m3u"
    elif test -f "$1"
    then
      case "$1" in
        *.m3u|*.M3U|*.m3U|*.M3u)
          cat "$1" | awk '{if ($0 !~ /^#/) print}' >> "$HOME/.plait/plaiter0.m3u"
        ;;
  
        *)
          odir="`pwd`"
          cd "`dirname \"$1\"`"
          dir="`pwd`"
          cd "$odir"
          file="`basename \"$1\"`"
          echo "$dir/$file" >> "$HOME/.plait/plaiter0.m3u"
        ;;
      esac
    else
      case "$1" in
        http*)
          echo "$1" >> "$HOME/.plait/plaiter0.m3u"
        ;;
      esac
    fi
    shift
  done
  touch "$HOME/.plait/plaiter0.m3u"

  # possibly shuffle the playlist
  if test $ORDER = "random"
  then
    cat "$HOME/.plait/plaiter0.m3u" | awk 'BEGIN{srand()} {print rand() "\t" $0}' | \
      sort -n | cut -f "2-" > /tmp/cut.$$
    mv /tmp/cut.$$ "$HOME/.plait/plaiter0.m3u"
  fi

  cat "$HOME/.plait/plaiter0.m3u" >> "$HOME/.plait/plaiter.m3u"

  # before sending a command, make sure daemon is active
  if ! test -e "$HOME/.plait/pdaemon"
  then
    start_daemon
  fi

  # --status is a pseudo command that doesn't get sent to the daemon
  if test $DOSTATUS -gt 0
  then
    if test -e "$HOME/.plait/status"
    then
      cat "$HOME/.plait/status"
    fi
  fi

  # --list is a pseudo command that doesn't get sent to the daemon
  if test $DOLIST -gt 0
  then
    if test -e "$HOME/.plait/plaiter.m3u"
    then
      cat "$HOME/.plait/plaiter.m3u"
    fi
  fi

  # there are default commands in certain cases
  if test $QUEUE = 0 && test "-$COMMAND-" = "--" && test $DOSTATUS = 0 && test $DOLIST = 0
  then
    COMMAND=reset
  elif test $QUEUE -gt 0 && test "-$COMMAND-" = "--" && test $DOSTATUS = 0 && test $DOLIST = 0
  then
    COMMAND=play
  fi
  if ! test "-$COMMAND-" = "--"
  then
    while true
    do
      if test $VERBOSE -gt 0
      then
        echo Sending command $COMMAND
      fi
      sleep 3 &
      echo $COMMAND > "$HOME/.plait/pdaemon"
      if test $? = 0
      then
        kill $!
        break
      else
        if test $VERBOSE -gt 0
        then
          echo Had to clean up pipe, trying again
        fi
        rm "$HOME/.plait/pdaemon"
        start_daemon
      fi
    done
  fi

}

QUEUE=0
DAEMONMODE=0
COMMAND=""
VERBOSE=0
INSTALL=0
DOSTATUS=0
DOLIST=0
ORDER="sort"

while test $# -gt 0
do
  case "$1" in

    --queue|--enqueue|-q)
      QUEUE=1
      shift
    ;;

    --play)
      COMMAND=play
      shift
    ;;

    --pause)
      COMMAND=pause
      shift
    ;;

    --latch)
      if test "-$2-" = "-on-" || test "-$2-" = "-off-"
      then
        COMMAND="stoplatch $2"
        shift
      else
        COMMAND=stoplatch
      fi
      shift
    ;;

    --stop|-s)
      COMMAND=stop
      shift
    ;;

    --next|-n)
      if test "-$2-" = "--"
      then
        COMMAND="next"
      else
        if test 2>/dev/null $2 -gt -1
        then
          COMMAND="next $2"
          shift
        else
          COMMAND=next
        fi
      fi
      shift
    ;;

    --prev)
      if test "-$2-" = "--"
      then
        COMMAND="prev"
      else
        if test 2>/dev/null $2 -gt -1
        then
          COMMAND="prev $2"
          shift
        else
          COMMAND=prev
        fi
      fi
      shift
    ;;

    --search)
      COMMAND="search $2"
      shift
      shift
    ;;

    --rsearch)
      COMMAND="rsearch $2"
      shift
      shift
    ;;

    --reset|-r)
      COMMAND=reset
      shift
    ;;

    --loop)
      if test "-$2-" = "-on-" || test "-$2-" = "-off-"
      then
        COMMAND="loop $2"
        shift
      else
        COMMAND=loop
      fi
      shift
    ;;

    --quit)
      COMMAND=quit
      shift
    ;;

    --random)
      ORDER=random
      shift
    ;;

    --status)
      DOSTATUS=1
      shift
    ;;

    --list|-l)
      DOLIST=1
      shift
    ;;

    --daemon|-d)
      DAEMONMODE=1
      shift
    ;;

    --install)
      INSTALL=1
      shift
    ;;

    --help)
      usage
      exit 0
    ;;

    --version)
      version
      exit 0
    ;;

    -v)
      VERBOSE=1
      shift
    ;;

    -*)
      echo Ignoring bad option $1
      shift
    ;;

    *)
      break
    ;;

  esac
done

CYGWIN=`uname -s | grep -ic CYGWIN`
if test $CYGWIN -ge 1
then
  echo Sorry, plaiter does not run on Cygwin
  exit 0
fi

maybe_install
if test $INSTALL = 1
then
  exit 0
elif test $DAEMONMODE = 1
then
  daemon_mode
  exit 0
else
  controller_mode "$@"
  exit 0
fi