#!/bin/sh
#todo: bei jeder Aenderung auch usage (doc) anpassen
#todo: translate entire script into english


# adds date taken in beginning of file name if jpg, .png, (not yet: .mp4, .mov, ...)

# Attention: there is a hard link to this script at the end!!! moving this script meens changing it

# options
# -h --help                      display help
# -a --noask --no-interactive    do not prompt the user to confirm renaming
# -l --onlylog                   just logs what would have been done but not doing anything
# -o [file] --outputfile [file]  specifies the output (log) file (standard is da.log)
# -v [file] --voutputfile [file] specifies the verbose output log file (standard dav.log)

# to be implemented in other sript:
# -i --image                     adds date taken in beginning of file name if jpg, .png, (not yet: .mp4, .mov, ...)

#Functions
vLog()
{
  echo "$1" >> "$VLOGFILE"
}

log()
{
  echo "$1" >> "$NVLOGFILE"
  echo "$1" >> "$VLOGFILE"
}

rename()
# moves $1 to $2 if rn is 1, otherwise set variable new to $1
# log move on any case
{
  log "rn \"$1\" to \"$2\""
  if [ $rn -eq 1 ]
  then
    mv -- "$1" "$2"
  else
    new="$1"
  fi
}


remove()
# deletes $1 if rn is 1, otherwise only logging
{
  if test -f "$1"
    then
    #echo "$1"
    log "rm \"$1\""
    if test $rn -eq 1
    then
      trash "$1"
    fi
  fi
}

usage()
# displays help message and exit
{
  echo ""
  echo "help page for $0"
  echo "---------------------------------"
  echo "this script should not be called directly but by the Wrapper script WrapperAddDateTaken.sh"
  echo "Usage: bash $0 [OPTIONS] DIR"
  echo "  $0 adds the date the picture was taken or movie was filmed at the beginning of the file name."
  echo ""
  echo "options"
  echo "  -h, --help                      display this help"
  echo "  -a, --noask --no-interactive    do not prompt the user to confirm renaming (standard is asking for each file)"
  echo "  -l, --onlylog                   just logs what would have been done but not doing anything"
  echo "  -o [file], --outputfile [file]  specifies the output (log) file (standard is da.log)"
  echo "  -v [file], --voutputfile [file] specifies the verbose output log file (standard dav.log)"
  echo "  --                              finishes the list of options, next argument is taken as the dir"
  #echo "  -i, --image                     adds date taken in beginning of file name if jpg, .png, (not yet: .mp4, .mov, ...)"
  echo ""
  echo "error handling"
  echo "  if DIR is no valid directory, the scripts eith error code 1"
  exit
}

folderloc()
# returns the argument as absolute path
# arg1: if arg1 starts with /, return arg1, otherwise return $(pwd)/arg1
{
  case "$1" in
    /* ) echo "$1"
        break
      ;;
    * ) echo "$(pwd)/$1"
        break
      ;;
  esac
}

# considering options
# saving all options to give them recursively
ops=""
# standard behavior: ask the user is file is to be renamed
# 0 meens not asking
ask=1
# standard behavior: actually rename
# 0 meens not renaming but just log what would have be done
rn=1
# standard behaviour: rename as usual
# 1 meens adding date taken to image and video files
# image=0
# the log file for verbose logging
#VLOGFILE="$1"
VLOGFILE="$(pwd)"/../rnv.log
# the log file for short logging
#NVLOGFILE="$2"
NVLOGFILE="$(pwd)"/../rn.log

#directory to be checked
dir="$(pwd)" # standard if not specified

# -n = string is non-zero length?
while test -n "$1" ; do
    case $1 in
        -h | --help )           usage;;
        -o | --outputfile )     # ops="$ops -o ../$2"
                                shift
                                NVLOGFILE="$(folderloc "$1")"
                                ;;
        -v | --voutputfile )    #ops="$ops -v ../$2"
                                shift                                
                                VLOGFILE="$(folderloc "$1")"
                                ;;
        -a | --noask | --no-interactive ) ops="$ops -a"   
                                ask=0
                                ;;
        -l | --onlylog )        ops="$ops -l"
                                rn=0
                                ;;
        -- )                    shift
                                dir="$(folderloc "$1")"
                                break
                                ;;
        * )                     dir="$(folderloc "$1")"
                                break
                                ;;
    esac
    shift # must be done in any case: the next argument is $1
done

# echo "options"
# echo "asking=$ask"
# echo "rename=$rn"
# echo "log file=$NVLOGFILE"
# echo "verbose log file=$VLOGFILE"
# echo "direc=$dir"

#for testing purposes:
# exit 

addDates()
# adds the picture taken dates to all pictures and descends into subfolders
{
  for fil in *
  do
    if test -d "$fil"
    then
      cd "$fil"
      addDates
      cd ..
      vLog "went back to $(pwd)"

      continue
      #vLog "handle dir"
      # * als einziger Dateiname kommt auch bei leerem Ordner vor
    fi
    if test -e "$fil" # file to be moved exists
    then
      : # ok, do what comes after fi
    else
      continue
    fi
    case "$fil" in
      201[0-9]_[01][0-9]_[0-3][0-9]*)
        vLog "dont rename bc already date there: $fil";;
      *.[jJ][pP][gG]|*.[jJ][pP][eE][gG]|*.[pP][nN][gG]) #|*.3gp|*.[aA][vV][iI])
        date=$(exiftool -d "%Y_%m_%d_%H%M%S" -CreateDate "$fil" | awk '{print $4}')
        # -z length is zero
        if test -z "$date"
        then
          vLog "the file has no creation date: $fil"
        else
          # remove SAM_Zahl
          new="$(echo "$fil" | sed 's/SAM_[0-9]\{4\}//')"
          # remove DSC_Zahl (e.g. Hollys camera)
          new="$(echo "$new" | sed 's/DSC_[0-9]\{4\}//')"
          # remove DSCZaahl
          new="$(echo "$new" | sed 's/DSC[0-9]\{5\}//')"
          # remove DSCFZahl
          new="$(echo "$new" | sed 's/DSCF[0-9]\{4\}//')"
          # remove DSCIZahl
          new="$(echo "$new" | sed 's/DSCI[0-9]\{4\}//')"
          # remove DSCNZahl
          new="$(echo "$new" | sed 's/DSCN[0-9]\{4\}//')"
          # remove IMGPZahl (e.g. Romy Fischers camera)
          new="$(echo "$new" | sed 's/IMGP[0-9]\{4\}//')"
          #remove Zah-Zahl_IMG
          new="$(echo "$new" | sed 's/[0-9]\{3\}-[0-9]\{4\}_IMG//')"
          # remove IMG_Daaatuum_Zeeiit (e.g. my smartphone)
          new="$(echo "$new" | sed 's/IMG_20[0-9]\{6\}_[0-9]\{6\}//')"
          # remove IMG_Zahl
          new="$(echo "$new" | sed 's/IMG_[0-9]\{4\}//')"
          # remove PZaaaahl
          new="$(echo "$new" | sed 's/P[0-9]\{7\}//')"
          # remove PCZaaahl
          new="$(echo "$new" | sed 's/P[ABC][0-9]\{6\}//')"
          # remove PICTZahl
          new="$(echo "$new" | sed 's/PICT[0-9]\{4\}//')"
          # remove SDCZaahl
          new="$(echo "$new" | sed 's/SDC[0-9]\{5\}//')"
          # remove RIMGZahl
          new="$(echo "$new" | sed 's/RIMG[0-9]\{4\}//')"
          # remove Zaaaaaaaaahl_0Mbelieb--.Z (my smart phone at second bluetooth copy)
          new="$(echo "$new" | sed 's/[0-9]\{14\}_0M.\{6\}\--\.[1-9]//')"
          # remove 0beliebi--.Z (my smart phone)
          new="$(echo "$new" | sed 's/0.\{7\}--\.[1-9]//')"
          # remove 0CLxbelb--.Z (my smart phone)
          new="$(echo "$new" | sed 's/0CLx.\{6\}--\.[1-9]//')"
          # remove FotoZahl
          new="$(echo "$new" | sed 's/Foto[0-9]\{4\}//')"
          # hochzeitsbilder 180505_Za_Hochzeit (Z)
          new="$(echo "$new" | sed 's/180505_[01][0-9]_Hochzeit ([0-9]*)/Hochzeit/')"
          case "$new" in
            _*|.*) ;; #tue nichts
            *)
              new="_$new";;
          esac
          new="$date$new" # date und _ haben keine Leerzeichen
          # existiert eine Datei mit dem neuen Namen bereits?
          # -e ist exist. die Datei schon?
          
          # different jpeg extensions:
          new="$(echo "$new" | sed 's/\.JPG/.jpg/g')"
          new="$(echo "$new" | sed 's/\.JPEG/.jpg/g')"
          new="$(echo "$new" | sed 's/\.jpeg/.jpg/g')"
          if test -e "$new"
          then
            log "a file with name \"$new\" already exists, -> dont rename: $fil"
          else
            if test $ask -eq 0
            then
              rename "$fil" "$new"
            else
              # Abfrage ob man wirklich umbenennen will
              echo "rename $fil to $new? enter, y, yes = yes"
              read q
              if test -z "$q" -o "$q" = "y" -o "$q" = "yes"
              then
                rename "$fil" "$new"
              fi
            fi
          fi
        fi
      ;;
      *) vLog "dont rename bc no image: $fil"
    esac
  done
}

#actual script

# check if the argument is correct:
if test ! -d "$dir"
then
  log "exiting bc there is no such dir as $dir"
  #echo "exiting bc there is no such dir"
  exit 1
fi

vLog "move to $dir"
cd "$dir"

addDates

# merke: in Bedingungsklammern [] von if muss am Anfang und am Ende ein " " (blank) stehen!!
# merke: Hinweise zu Bedingungen in if abrufbar unter "man test"
# merke: bei Zuweisungen mit = darf zwischen Variablenname und = kein Leerzweichen sein! 
# (sonst wird Variablenname als command interpretiert)