#!/bin/bash
# grpdsku.sh - A shell script to display the form dialog on screen



 DIALOG_CANCEL=1
 DIALOG_ESC=255
 HEIGHT=0
 WIDTH=0

 display_result() {
   dialog --title "$1" \
    --no-collapse \
    --msgbox "$result" 0 0
 }

 while true; do



 Now=date + %M/%D/%Y
 groups=""
 date1="  "  
 n=""
 email=""

# open fd - fields can't be empty,
 
 error_message=
 IFS=$'\n'; set -f
 while [[ -z $groups || -z $date1 || -z $n|| -z $email ]]; do
   set $(dialog … --form="creating new $error_message" … --output-fd=3 3>&1 >/dev/tty)
   groups=$1 date1=$1 n=$1 email=$1 
   error_message="(fields must not be empty)"
   done
 unset IFS; set +f


# Store data to  variable - data entry form for users

 dialog --separate-widget $\n 
       --clear \
       --ok-label "Submit" \
       --cancel-label "Exit" \
       --backtitle "SAS Managment" \
       --title "Disk Space" \
       --form "Disk Optimization" \15 50 0 \
	"Enter groupname  :"                         1 1	"$groups"  1 10 30 0 \
	"Enter current date (09/30/2016):"           2 1	"$date1"   2 10 10 0 \
	"Enter the number records [1-30 or F]:"      3 1         "$n"      3 10 10 0 \
	"Enter email:"                               4 1	 "$email"  4 10 60 0 \
 2>&1 1>&3)| {
  read -r groups
  read -r date1
  read -r n
  read -r email

 
#-----read in the current timestamp text file----------
 
 DISKINFO=tail -$n "/var/LV/$disk_'date +%Y.%H.%d'.txt"   



#----check date format for example 09/30/2016---------------

 regex=/^[0-1][0-9]/[0-3][0-9]/[0-9]\{4\}$/


 if [[$regex =~ date -d "$date1"]]
 then
 echo $date1 NOT a valid mm/dd/yyy date
 fi

#---------------if group name isn't in text file then display error message--

 if ! grep -q '$group' $DISKINFO ; then
    echo $group Not found.
   ELSE
   continue
 fi

---------exit and continue shell scripting-----
 exit_status=$?

# close fd
  exec 3>&-

 case $exit_status in
    $DIALOG_CANCEL)
      clear
      echo "Program terminated."
      exit
      ;;

    $DIALOG_ESC)
      clear
      echo "Program aborted." >&2
      exit 1
      ;;
  Esac



# display values just entered

#match the group name the input to the group name in the text file, for example,  hasasvmi

 grp=(echo "$groups" | grep "$groups" "$DISKINFO")

#--------read in text file line by line.  Print and format date and time---------

  while IFS='' read -r f1 f2 f3 f4 f5 f6

 do

 f7=  date +%m/%d/%Y | awk  'BEGIN {FS=". _" OFS="/"} {print $6'}' 

 f8  = date +%T   "  | awk  'BEGIN {FS="_ ." OFS=":"} {print $f6}' 


#---if field f4 is null or has a dash then add 0.0%---------------------

 if [${f4} eq'' || ${f4} eq '-'] Then ${f4} eq'0.0%'

 fi
done

#----if the date from the input form matches the date  from the text file and group name then print the fields
fi
 do
 if[${date1}==${Date}] && [grp] THEN



  # display fields using f1, f2,..,f8 

  echo result =( printf '\tFileSystem%s\tSize%d%s\tAvail%d%s\tused(GB,KB,MB)%d %s\tuse% %s\ tMounted on %s\ tDate%s\ tTime%s\n' "$f1" "$f2" "$f3" "$f4" "$f5"  "$f6" "$f7" "$f8")
  fi




  display_result "Disk Space used by $group"

#------print result output to a csv file. CSV File is group label--------

"$result" > $group.csv

#---------csv file is sent via email to user-----------------

[ -s group.csv ] && mailx -s "subject text" -a  "$group.csv" "$email" < "Disk space used by $group "
done <"$DISKINFO"