#!/bin/bash

while [ ! -f  $file ]
do

    #ask user for filename
    read -p "What is the filename? "  username

    if [ ! -f $file ]
        then
            echo "File not found!"
        else
            echo "File found!"
    fi
done

#process each line and make a user from the data
cat $file | while read line

do
    #line example:
    #tony.stark@stark.com;1970/05/29;sudo,avengers;/avengersData

    #extract first name
    name=`echo $line | sed 's/^(.*)..*@.*$/1/g'`
    #name: tony

    #extract surname
    surname=`echo $line | sed 's/^.*.(.*)@.*$/1/g'`
    #surname: stark

    #extract birthdate
    bdate=`echo $line | sed 's/^.*;(.*);.*;.*$/1/g'`
    #bdate: 1970/05/29

    #extract list groups to add into array
    groups=`echo $line`
    #groups: sudo, avengers

    #extract name of shared folder
    folder=`echo $line`
    #folder: /avengersData


    #user = first letter of name, and full surname
    #get first letter
    temp1 = ${name:0:1}

    #build username
    user="${temp1}${surname}"
    #user: tstark

    #pass must be first month and year of birthdate arranged as MMYYYY
    passTemp1 = ${bdate:0:4}
    passTemp2 = ${bdate:6:7}

    #build password
    password = "${passTemp2}${passTemp1}"
    #password: 051970

    #tokenise group + add to array
    declare -a groupArray

    IFS=','
    groupArray=(`echo $groups | tr "," " "`)

    #create groups if not existing.
    for i in ${groupArray[@]}
        do
            if [ getent group $i ]
                then
                    echo "group exists"
                else
                    groupadd $i
            fi
        done


    #Create shared folders if not existing.
    if [ ! -d $folder ]
        then
            mkdir -p $folder
    fi

    #Create groups for shared folders
    gname=`echo "${folder:1}"`
    groupadd $gname

    #Set group as owner of directory and change permissions
    chgrp -R $gname $folder
    chmod -R 770 $folder

    #create user and add to groups
    if [ grep "^${user}:" /etc/passwd ]
        then
            echo "user exists already!"

        else
            #Create user
            useradd -m -d /home/$user -p $pass $user

            #Add user to groups
            for i in ${groupArray[@]}
                do
                    usermod -a -G $i $user
                done

            #Add user to shared group
            usermod -a -G $gname $user
    fi

    #force password change
    chage -d 0 $user
done