#!/bin/bash

# doit [ -f ] [ -ng ] input_1 input_2 ... input_n points output


eval set -- "$(getopt -o hf1ni:p:o:s: --long help,force,noGain,dummy,input:,points:,output:,sampleRate: -n "$(basename "$0")" -- "$@")"

force=false
noGain=false
dummy=false

while true; do
  case "$1" in
    -h|--help)
      echo "$0"' [ -f | --force ] [ -1 | --noGain ] [ -n | --dummy ] { ( -i | --input= ) input$i.flac } ( -o | --output= ) output.flac ( -p | --points= ) points'
      echo ' Mischen und Schneiden:'
      echo '  -f | --force:        output.flac ggf. überschreiben'
      echo '  -1 | --noGain:       Lautstärke nicht normalisieren'
      echo '  -n | --dummy:        nur auszuführenden Befehl anzeigen und nichts tun'
      echo '  -s | --sampleRate=:  alternative Samplerate zum Abspeichern'
      echo '  -i | --input=:       Quelle'
      echo '  -o | --output=:      Ziel'
      echo '  -p | --points=:      Punktedatei'
      echo "$0"' [ -h | --help ]'
      echo ' Hilfe anzeigen'
      exit 0
      ;;
    -f|--force)
      force=true
      ;;
    -1|--noGain)
      noGain=true
      ;;
    -n|--dummy)
      dummy=true
      ;;
    -i|--input)
      shift
      inputs[${#inputs[@]}]="$1"
      ;;
    -o|--output)
      shift
      [ -n "${output}" ] && echo 'Ich kann nur eine Output-Datei-Option verstehen.' && exit 1
      output="$1"
      ;;
    -p|--points)
      shift
      [ -n "${points}" ] && echo 'Ich kann nur eine Point-Datei-Option verstehen.' && exit 1
      points="$1"
      ;;
    -s|--sampleRate)
      shift
      [ -n "${outRate}" ] && echo 'Ich kann nur eine Samplerate-Option verstehen.' && exit 1
      outRate="$1"
      ;;
    --)
      shift
      [ $# -gt 0 ] && echo 'Unbekannte Parameter: '"$#" && exit 1
      break
      ;;
    *)
      echo 'Hups, das sollte nicht passieren könne, '"$1"' kenne ich doch nicht ...'
      exit -1
      ;;
  esac
  shift
done

[ -z "${output}" ] && echo 'Output-Datei fehlt!' && exit 1
[ -z "${points}" ] && echo 'Points-Datei fehlt!' && exit 1
[ "${#inputs[@]}" -eq 0 ] && echo 'Input-Datei fehlt!' && exit 1

dir="$(dirname $0)"

[ ! -e "${points}" ] && echo "Die Schnittpunktedatei ${points} existiert nicht!" && exit 1
for inp in "${inputs[@]}"
do
  [ ! -e "${inp}" ] && echo "Die Inputdatei ${inp} existiert nicht!" && exit 1
  [ $(echo "${inp}" | grep -c " ") -gt 0 ] && echo "Bitte keine Leerzeichen im input-Dateinamen!" && exit 1
done

[ $(echo "${output}" | grep -c " ") -gt 0 ] && echo "Bitte keine Leerzeichen im output-Dateinamen!" && exit 1
[ $(echo "${points}" | grep -c " ") -gt 0 ] && echo "Bitte keine Leerzeichen im points-Dateinamen!" && exit 1

if [ -e "${output}" ]
then
  if ${force}
  then
    ${dummy} || rm "${output}"
  else
    echo "Die Ausgabedatei ${output} existiert bereits!" && exit 1
  fi
fi
odn="$(dirname "${output}")"
obn="$(basename "${output}")"
if [ $(ls -1 "${odn}" | grep "$(echo "${obn}" | sed "s/%[0-9]\?n/.*/g")" | wc -l) -gt 0 ]
then
  if ${force}
  then
    ${dummy} || rm ${odn}/$(echo "${obn}" | sed "s/%[0-9]\?n/*/g")
  else
    echo "Die Ausgabedatei ${output} existiert bereits!" && exit 1
  fi
fi

samplerate=$(soxi -r "${inputs[0]}")
[ -z ${outRate} ] && outRate=${samplerate}
i=-1
abstime=0
while read -r in
do
  line="$(echo "${in}" | sed "s/^ *//" | sed "s/ *\(\# .*\)\{0,1\}$//")"
  [ "${line}" == "" ] && continue
  if [ $i -eq -1 ]
  then
    firstline="$(echo "${line}" | sed "s/ *\#.*$//")"
    remixcmd="$(echo "${in}" | sed "s/^[^\#]*\#//" | sed "s/ *\(\# .*\)\{0,1\}$//")"
    i=0
    continue
  fi
  if [ $(echo "${line}" | grep -c "^\#") -eq 1 ]
  then
    trackmods[${i}]=" $(echo "${line}" | sed "s/^.*\#//")"
    timecorrections[${i}]=0
    while [ $(echo "${trackmods[${i}]}" | grep -c " trimsplice") -eq 1 ]
    do
      tmp="$(echo "${trackmods[${i}]}" | sed "s/X/x/g" | sed "s/trimsplice/X/g" | sed "s/^[^X]* X  *//" | sed "s/  / /g")"
      end=$(${dir}/timetosample ${samplerate} $(echo "${tmp}" | awk '{print $1}'))
      if [ ! "${doverlaps[${i}]}" == "" ]
      then
        end=$[${end}+${doverlaps[${i}]}]
      fi
      discard=$(${dir}/timetosample ${samplerate} $(echo "${tmp}" | awk '{print $2}'))
      excess=$(${dir}/timetosample ${samplerate} $(echo "${tmp}" | awk '{print $3}'))
      leeway=$(${dir}/timetosample ${samplerate} $(echo "${tmp}" | awk '{print $4}'))
      trackmods[${i}]="$(echo "${trackmods[${i}]}" | sed "s/ *trimsplice  *[^ ][^ ]*  *[^ ][^ ]*  *[^ ][^ ]*  *[^ ][^ ]*/ trim 0s ${end}s ${discard}s splice -t ${end}s,${excess}s,${leeway}s/")"
#      trackmods[${i}]="$(echo "${trackmods[${i}]}" | sed "s/ *trimsplice  *[^ ][^ ]*  *[^ ][^ ]*  *[^ ][^ ]*  *[^ ][^ ]*/ trim 0s ${end}s ${discard}s/")"
      timecorrections[${i}]=$[${timecorrections[${i}]}+${discard}+2*${excess}]
    done
    continue
  fi
  i=$[${i}+1]
  tmp=$(${dir}/timetosample ${samplerate} $(echo "${line}" | sed "s/ *\(\#.*$\)\{0,1\}$//"))
  times[${i}]=$[${tmp}-${abstime}]
  abstime=${tmp}

  newFile[${i}]=true
  tmp="$(echo "${line}" | sed "s/^[^\#]*#\?//" | sed "s/\s\./ 0./g")"
  while [ -n "${tmp}" ]
  do
    if [[ "$tmp" = "overlap "* ]]
    then
      overlaps[${i}]=$[$(${dir}/timetosample ${samplerate} $(echo "${tmp}" | sed "s/^overlap \(\S\+\)\(\s.*\)\?$/\1/"))/2]
      doverlaps[${i}]=$[2*${overlaps[${i}]}]
      tmp="$(echo "${tmp}" | sed "s/^\S\+\s\+\S\+\s*//")"
      continue
    fi
    if [[ "$tmp" = "noNewFile"* ]]
    then
      newFile[${i}]=false
      tmp="$(echo "${tmp}" | sed "s/^\S\+\s*//")"
      continue
    fi
    echo "'${tmp}' ist unverständlich zwischen zwei Stücken"
    exit 1
  done
done < "${points}"

#for (( i=0; i<=${#times[@]}; i++ ))
#do
#  echo "${i} ; ${trackmods[${i}]} ; ${times[${i}]} ; ${overlaps[${i}]} ; ${doverlaps[${i}]} ; ${timecorrections[${i}]}"
#done
#exit 0

repcmd=""
abstime=0
for (( i=1; i<=${#times[@]}; i++ ))
do
  abstime=$[${abstime}+${times[${i}]}]
  [ "${doverlaps[${i}]}" == "" ] && continue
  repcmd="${repcmd} trim 0s $[${abstime}-${doverlaps[${i}]}]s : trim 0s ${doverlaps[${i}]}s repeat :"
  abstime=0
done

trackmodcmd=""
abstime=0
for (( i=0; i<=${#times[@]}; i++ ))
do
  if [ ${i} -gt 0 ]
  then
    [ "${timecorrections[$[${i}-1]]}" == "" ] || times[${i}]=$[${times[${i}]}-${timecorrections[$[${i}-1]]}]
  fi
  [ "${times[$[${i}+1]]}" == "" ] || abstime=$[${abstime}+${times[$[${i}+1]]}]
  [ "${doverlaps[${i}]}" == "" ] || abstime=$[${abstime}+${doverlaps[${i}]}]
  [ "${trackmods[${i}]}" == "${trackmods[$[${i}+1]]}" ] && continue
  if [ ${i} -eq ${#times[@]} ]
  then
    trackmodcmd="${trackmodcmd}${trackmods[${i}]} "
  else
    trackmodcmd="${trackmodcmd}trim 0s ${abstime}s${trackmods[${i}]} : "
  fi
  abstime=0
done

splicecmd=""
abstime=0
for (( i=0; i<=${#times[@]}; i++ ))
do
  [ "${times[${i}]}" == "" ] || abstime=$[${abstime}+${times[${i}]}]
  [ "${overlaps[${i}]}" == "" ] && continue
  splicecmd="${splicecmd} ${abstime}s,${overlaps[${i}]}s,0s"
  abstime=$[${abstime}+${doverlaps[${i}]}]
done
[ "${splicecmd}" == "" ] || splicecmd="splice -t${splicecmd}"

trimcmd=""
for (( i=1; i<=${#times[@]}; i++ ))
do
  if [ ${outRate} -eq ${samplerate} ]
  then
    trimcmd="${trimcmd}trim 0s =${times[${i}]}s : "
  else
    trimcmd="${trimcmd}trim 0s =$[$[${times[${i}]}*${outRate}+${samplerate}/2]/${samplerate}]s : "
  fi
  ${newFile[${i}]} && trimcmd="${trimcmd}newfile : "
done

if [ ! ${outRate} -eq ${samplerate} ]
then
  remixcmd="${remixcmd} rate -v ${outRate}"
fi

if ! ${noGain}
then
  firstline="${firstline} gain -b"
  remixcmd="${remixcmd} gain -n"
fi

echo sox -M "${inputs[@]}" -p trim ${firstline}
echo sox -t sox - -p ${repcmd}
echo sox -t sox - -p ${trackmodcmd}
echo sox -t sox - -p ${splicecmd} ${remixcmd}
echo sox -t sox - ${output} ${trimcmd}

if ! ${dummy}
then
  sox -M "${inputs[@]}" -p trim ${firstline}| \
      sox -t sox - -p ${repcmd} | \
      sox -t sox - -p ${trackmodcmd} | \
      sox -t sox - -p ${splicecmd} ${remixcmd} | \
      sox -t sox - ${output} ${trimcmd}
fi

#if $noGain
#then
#  echo sox -M "${@:1:$[$#-2]}" -p trim ${firstline}
#  echo sox -t sox - -p ${repcmd}
#  echo sox -t sox - -p ${trackmodcmd}
#  echo sox -t sox - -p ${splicecmd} ${remixcmd}
#  echo sox -t sox - ${output} ${trimcmd}
#
#  sox -M "${@:1:$[$#-2]}" -p trim ${firstline}| \
#      sox -t sox - -p ${repcmd} | \
#      sox -t sox - -p ${trackmodcmd} | \
#      sox -t sox - -p ${splicecmd} ${remixcmd} | \
#      sox -t sox - ${output} ${trimcmd}
#else
#  echo sox -M "${@:1:$[$#-2]}" -p trim ${firstline} gain -b
#  echo sox -t sox - -p ${repcmd}
#  echo sox -t sox - -p ${trackmodcmd}
#  echo sox -t sox - -p ${splicecmd} ${remixcmd}
#  echo sox -t sox - -p gain -n
#  echo sox -t sox - ${output} ${trimcmd}
#
#  sox -M "${@:1:$[$#-2]}" -p trim ${firstline} gain -b | \
#      sox -t sox - -p ${repcmd} | \
#      sox -t sox - -p ${trackmodcmd} | \
#      sox -t sox - -p ${splicecmd} ${remixcmd} | \
#      sox -t sox - -p gain -n | \
#      sox -t sox - ${output} ${trimcmd}
#fi