#!/bin/bash
# @autor 6543@obermui.de
# @date 2023-02-27
# @version 0.3

function free() {
  df "$1" | grep '/dev/' | sed -r -e "s/[\t\ ]+/ /g" | cut -d ' ' -f 4
}

md5="2cp"
aim="/data/Filme"
md5_success="cp.done.md5"
md5_conflict="cp.conflict.md5"

md5_tmp=`mktemp`
freenow=0

cat "$md5" > "$md5_tmp"
cat "$md5_tmp" | while read line; do
  file_orig="$(echo $line | cut -c 33- | sed -r -e "s/^[\ ]//g")"
  file_size=$(du "$file_orig" | cut -f 1)
  file_md5=$(echo $line | cut -c -32)
  file_aim=$(echo $file_orig | sed 's/data\/shares\/Filme/tmp\/sdl\/oberoed/g')
  file_aim_dir=$(echo $file_aim | rev | cut -d '/' -f 2- | rev)

  [ "$file_orig" == "$file_aim" ] && { echo Script ERROR; exit 255; }

  freenow=$(free "$aim")
  #add puffer
  freenow=$((freenow-10240))

  if [ -f "$file_orig" ]; then

    if [ "$freenow" -ge "$file_size" ]; then

      mkdir -p "$file_aim_dir"
      if [ -f "${file_aim}" ]; then
        echo "${file_md5}  ${file_aim}" >> ${md5_conflict}
        sed -i "/$file_md5/d" "$md5"
        echo "ERROR: ${file_aim} already exist, skipping"
      else

        file_md5_new=$(cat "${file_orig}" | tee "${file_aim}" | md5sum | cut -c -32)

        if [ "${file_md5_new}" == "${file_md5}" ]; then
          echo "${file_md5}  ${file_aim}" >> $md5_success
          sed -i "/$file_md5/d" "$md5"
        else
          echo "ERROR: Hash mismatch: \"NEW:${file_md5_new} OLD:${file_md5}\" $file_aim"
          rm "${file_aim}"
        fi
      fi

    else
      echo "WARNING: To Big: ${file_orig} (${file_size}), skipping"
    fi

  else
    echo "ERROR: Not Exist: ${file_orig}"
    sed -i "/$file_md5/d" "$md5"
  fi
done

rm "${md5_tmp}"