#! /bin/bash

###
#This script is designed to take a batch file from WorkDay which contains multiple PDFs of paychecks
#and convert it into individual PDF files with correct filenames.
#Navigate to the directory of your destination, and call this script with the argument of the batch file.
#This script will:
#- Break apart the batch file to multiple incorrectly named files
#- Read each file to obtain the Paycheck Date
#- Rename each file to Payslip-[DATE_WITH_UNDERSCRORES].pdf
#
#The script works by reading the pdf and finding the last line number containing the text "Check Date".
#It then reads the value of the next line, which should be the check date with slashes.
#The script then replaces slashes with underscores per the current convention.
#
#If this script ever breaks, it will most likely be a change in paycheck format and thus a failure
#to find the 'Check Date' field correctly.
###


func_help() {
  echo ""
  echo "DESCRIPTION: Takes large file containing multiple paystubs and breaks it into individual pdf files correctly named."
  echo ""
  echo "USAGE: $0 [FILENAME]"
  echo ""
}

func_paydate() {

  text=$(pdftotext $1 -)

  #echo $text

  linenum=$(pdftotext $1 - | grep -n "Check Date" | tail -n 1 | cut -d: -f1)

  #echo $linenum

  ((linenum=linenum+1))

  date=$(pdftotext $1 - | sed -n "${linenum}p")

}


func_rename() {

  func_paydate $1

  newname=Payslip-${date////_}.pdf

#  echo "Renameing $1 to $newname"

  mv $1 $newname

}


func_burst() {
  echo "Bursting PDF into individual pages..."

  pdftk $1 burst

  echo "Cleaning up unused files..."

  rm doc_data.txt
}



if [ $# -eq 0 ]; then
  echo "No filename(s) supplied.  Exiting."
  func_help
  exit 1
fi

if ! [ -f "$1" ]; then
  echo "Filename $1 does not exist. Exiting."
  func_help
  exit 1
fi

bulkfile=$1


func_burst $bulkfile		## Break apart PDFs

echo "Converting Filenames..."

for f in *.pdf; do		## Loop through new files
  func_rename "$f"		## Rename each file
done


## Get user input on weather to delete original bulk file

read -n 1 -p "Delete original bulk file? y/n [Default yes]" del

echo $del

if [ $del == "y" ]; then
  echo "Deleting file $1"
  rm $bulkfile
else
  echo "Leaving file $1 in place."
fi

echo "Script complete.  Exiting."
exit 0