#!/bin/bash

# exctute
# ./mod.sh file_type input_folder output_folder
# ./mod.sh *.txt /tmp /data/

# paramater count 
if [ ! $# -eq 3 ]; then
  echo "[ERROR] error paramater."
  exit
fi

# file type
file_type="${1}"

# input foloder
if [ -d "${2}" ]; then 
  folder="${2}"
else
  echo "[ERROR] input folder is not exsit."
  exit 
fi

# output folder
if [ -d "${3}" ]; then
  output="${3}"
else
  echo "[ERROR] output folder is not exsit."
  exit
fi

# search file
find ${folder} -name "${file_type}" | while read filename ; 
do
  # file type
  file_type=`echo ${filename##*.}`

  # file size
  file_size=`stat "${filename}" | sed -n '2,1p' | awk '{print $2}' `
  # file modify time
  file_modify=`stat "${filename}" | sed -n '6,1p' | awk '{print $2, $3}' | sed -e 's/[-: ]//g' `

  # output folder 
  path="${output}/${file_modify:0:6}"
  if [ ! -d "${path}" ]; then
    mkdir -p ${path}
    echo "folder(${path}) is created . "
  fi

  # new file full name 
  new_file_name=`echo ${path}/${file_modify}_[${file_size}].${file_type}`

  if [ ! -f "${new_file_name}" ]; then
    mv "${filename}" "${new_file_name}"
  else
    echo "file(${new_file_name}) is exsit, can not be removed. "
  fi
done
echo "finished !"
exit