#!/bin/env bash

#    Batch convert multiple Magic Lantern dual ISO image files on Linux
#    Copyright (C) 2017,2023  Pekka Helenius
#
#    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.
#
#    You should have received a copy of the GNU General Public License
#    along with this program; if not, write to the Free Software
#    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
#
###############################################

# We get the directory just from the first filename.
INPUT_DIR=$(dirname "${1}")
DIR_BASENAME=$(echo "${INPUT_DIR}" | rev | cut -d/ -f 1 | rev)

mkdir -p "${INPUT_DIR}/converted_dual_iso"

############################################################################################

# PROGRESSBAR CODE - BEGIN

LABELTEXT="Processing RAW images..."
numargs=$# # Number of all files
tics=100   # Percentage tics
inc=0      # Current file number
mltp=1000  # Percentage multiplier for bash

dbusRef=$(kdialog --title "Dual ISO (folder: ${DIR_BASENAME})" --progressbar "${LABELTEXT}" "${tics}")
qdbus $dbusRef showCancelButton true

# PROGRESSBAR CODE - END

while \
  [[ $# -gt 0 ]] && \
  [[ $(qdbus $dbusRef wasCancelled) == "false" ]]
do

  INPUT="${1}"
  INPUT_MTIME=$(stat -c "%Y" "${INPUT}")
  OLDFILE_CR2=$(basename "${INPUT}")

  # Once we do this, it's very clear which kind of CR2 file we're talking about here.
  NEWFILE_CR2=$(basename "${INPUT}" | sed 's/\.\w*$/_dualiso.CR2/')

  # Converted Dual ISO file.
  NEWFILE_DNG=$(basename "${INPUT}" | sed 's/\.\w*$/_dualiso.DNG/')

  # If converted Dual ISO exists already, we skip the conversion process.
  # This test passes only if the file doesn't exist.
  if [[ ! -e "${INPUT_DIR}/converted_dual_iso/${NEWFILE_DNG}" ]]
  then

    # Test an input file for Dual ISO.
    if [[ $(cr2hdr --dry-run "${INPUT}" | grep "Interlaced ISO detected" | wc -l) -eq 1 ]]
    then

      echo "Interlaced ISO detected: ${OLDFILE_CR2}"

      # Rename detected dual ISO CR2 file with a proper prefix
      # (so that we can distinguish Dual ISO images from "normal" CR2 files)
      mv "${INPUT_DIR}/${OLDFILE_CR2}" "${INPUT_DIR}/${NEWFILE_CR2}"

      # Input we will use from this point is the renamed file,
      # so we set INPUT variable to point to the renamed file.
      INPUT="${INPUT_DIR}/${NEWFILE_CR2}"

      # Process a valid input file.
      cr2hdr --process "${INPUT}"

      # Move converted dual iso file.
      mv "${INPUT_DIR}/${NEWFILE_DNG}" "${INPUT_DIR}/converted_dual_iso/"

      # Add Subject=Dual-ISO tag for every Dual ISO CR2 file.
      echo "Writing new EXIF/XMP tag Subject: Dual ISO CR2"
      exiftool -xmp:subject="Dual ISO CR2" "${INPUT_DIR}/${NEWFILE_CR2}" -overwrite_original
      touch --date=@"${INPUT_MTIME}" "${INPUT_DIR}/${NEWFILE_CR2}"
      touch --date=@"${INPUT_MTIME}" "${INPUT_DIR}/converted_dual_iso/${NEWFILE_DNG}"

    fi
  fi

##############################################

    # PROGRESSBAR CODE - BEGIN
    let inc++

    # Percentage needs to be calculated like this due to bash rounding limitations.
    PERCENT_VALUE=$(((${mltp}*${tics})/(200*${numargs}/${inc} % 2 + ${mltp}*${numargs}/${inc})))
    # Output: 20, 40, 59, 80, 100 etc.

    qdbus $dbusRef Set "" "value" "${PERCENT_VALUE}";
    qdbus $dbusRef setLabelText "$LABELTEXT (${inc}/${numargs})";

    # PROGRESSBAR CODE - END

    # Move to the next file.
    shift
done

##############################################

# Close processing window if cancelled event has been triggered.

# PROGRESSBAR CODE - BEGIN

# If the process was cancelled, remove tmp file and exit the script.
if [[ ! $(qdbus $dbusRef wasCancelled) == "false" ]]
then
    exit 0
fi

# Close processing window if not cancelled and processing finished.

qdbus $dbusRef close

# PROGRESSBAR CODE - END

##############################################

if [[ $(pgrep -x 'cr2hdr' | wc -l) == 0 ]]
then
  notify-send 'Dual ISO' -i image-x-krita 'Conversion done!'
fi

############################################################################################

QUESTCOUNT=0 #Ask this question only once

# Dual ISO (Subject only defined in converted Dual ISO DNG images)
for i in $(find "${INPUT_DIR}" -maxdepth 1 -type f -iname "*.DNG")
do
  if \
    [[ ! -z $(echo -n "${i}") ]] && \
    [[ $(exiftool "${i}" |grep --max-count=1 "Subject" | sed -e 's/.*: //g') == *"Dual-ISO"* ]]
  then

    if [[ "${QUESTCOUNT}" -eq 0 ]]; then
      QUESTION=$(kdialog --yesno "More Dual ISO files detected in '$(echo ${INPUT_DIR} | rev | cut -d/ -f1 | rev)' main folder. Do you want to move these files into 'converted_dual_iso' folder?";)
      echo "${QUESTION}"
      MOVEALL=true
      let QUESTCOUNT++
    else
      MOVEALL=false
    fi

    if [[ "${MOVEALL}" == true ]]; then
      mv "${i}" "${INPUT_DIR}/converted_dual_iso/"
      echo "DEBUG: all detected Dual ISO images moved to 'converted_dual_iso' folder"
    fi
  fi
done

############################################################################################

# If there are no files converted, we delete converted_dual_iso folder
if [[ $(ls "${INPUT_DIR}/converted_dual_iso" | wc -l) -eq 0 ]]
then
  rm -Rf "${INPUT_DIR}/converted_dual_iso"
fi

exit 0