#!/bin/bash

is_user () {
    local id;local user
    echo -n $(id -u $1 2> /dev/null)
}

user_group_add() {
  [[ ! $(getent group $1) ]] && echo "no group $1, aborting" && return 1
  echo adding group $1 to $USER
  sudo usermod -a -G $1 $USER
}

# TODO change a user name
# sudo usermod -d /home/joedoe -m johndoe 
# sudo groupmod -n johndoe student1
# sudo usermod -u 5001 johndoe

# clone a user

# adduserid name id#
# add a suer with specific id number
# adduserid () {         
# sudo groupadd -g $2 $1
# sudo useradd -d ${/home/$1} -s /bin/bash -u $2 -g $1 $1
# }


adduserid() {

[[ "$#" -lt 1 ]] && echo a user name is requied, aborting && return 1
name=$1
uid=${2:-1000}
gid=${3:-$uid}
echo $name, $uid, $gid

[[ $(getent group $gid) ]] && echo group id $gid already exists, aborting && return 3
[[ $(getent group $name) ]] && echo group name $name already exists, aborting && return 3
[[ $(getent passwd $uid) ]] && echo user id $uid already exists, aborting && return 2
[[ $(getent passwd $name) ]] && echo user name $name already exists, aborting && return 2
 
addgroup --gid $gid $name 
adduser --uid $uid --ingroup $name --gecos ""  --disabled-password --no-create-home $name
# cat /etc/group | grep $name && cat /etc/passwd | grep $name  

}    

function clone_user_ () {

    module_load confirm

    echo "============="
    echo "this script will create a new user"
    echo "based on an existing user's data"
    echo 
    echo "You will be shown a list of users who can currently log on"
    echo "Remember which user you would like to clone."
    echo "You will be asked for the new user's name, their password"
    echo "and the old user to clone".
    echo "============="
    echo 

    echo -n "New user's name: "
    read newuser

    echo -n "New user's password: "
    read newpassword

    echo 

    echo "Current users you can clone:"
    echo "----"
    awk -F'[/:]' '{if ($3 >= 1000 && $3 != 65534) print $1}' /etc/passwd
    echo 

    echo -n "Old user to clone: "
    read olduser
    echo "olduser uid is $(id -u $olduser)" 

    echo 
    echo "You have selected: "
    echo "----"
    echo "new user: $newuser"
    echo "new user password: $newpassword"
    echo "old user: $olduser"
    echo 

    olduser_GROUPS="$(id -Gn ${olduser} | sed "s/${olduser} //g" | sed "s/ ${olduser}//g" | sed "s/ /,/g"),$olduser"
    olduser_SHELL=$(awk -F : -v name=${olduser} '(name == $1) { print $7 }' /etc/passwd)

    echo "old user groups: "
    echo "----"
    echo $olduser_GROUPS
    echo "olduser shell: "
    echo $olduser_SHELL

    confirm "ready to clone user, begin?" || return 1

    useradd --groups $olduser_GROUPS --shell $olduser_SHELL $newuser

    echo $newuser:$newpassword | chpasswd

    read -rsp $'ready to make home direcoty -- ctrl-c to exit...\n' -n1 key

    mkdir /home/$newuser
    chown -R $newuser:$newuser /home/$newuser

     echo 
     echo "Script should be done now."
     echo 
     echo "Do you see your new users name below?"
     echo 
     awk -F'[/:]' '{if ($3 >= 1000 && $3 != 65534) print $1}' /etc/passwd

     echo 
     echo "We are now going to copy the old user's home folder to the new user"
     echo "then change ownership to the new user"
     echo 
     read -rsp $'Ready to copy home folder --- or ctrl-c to exit...\n' -n1 key

    rsync -aPv --exclude 'Downloads' /home/$olduser/. /home/$newuser/
    chown -R --from=$olduser $newuser:$newuser /home/$newuser

    echo 
    echo "Now we are going to change the names of files and folders to the new user"
    echo 

    grep -rlI $olduser /home/$newuser/ . | sudo xargs sed -i 's/$olduser/$newuser/g'

    echo 
    echo "Done now."
    echo 
    read -rsp $'Press any key to exit...\n' -n1 key
    echo 
    echo 

}

clone_user () {
    if [[ $EUID != 0 ]]; then

        clone=$(declare -f clone_user_)
        module_load confirm
        confirm=$(declare -f confirm)
        sudo bash -c "$confirm; $clone; clone_user_"
    else 
    echo run as regular user with sudo privliges and it will elevate 
    fi
}

rename_user () {

    module_load confirm   
    local force; local name; local newname; local newhome

    [[ $1 = "-f" ]] && { force=true; shift 1; } 
    [[ $1 = "-h" ]] && { newhome=$2; shift 2; } 
    # usage:  < -f, -h newhome > name newname
    # default new user home is /home/newname
    name=$1
    newname=$2
    if [[ ! ($name && $newname) ]]; then
       echo "============="
       echo "this script will rename an existing user"
       echo "user running this script must to root or have sudo priviledges to run"
       echo "---- Available Users to Rename ---"
       awk -F'[/:]' '{if ($3 >= 1000 && $3 != 65534) print $1}' /etc/passwd
       echo "============="
       read -r -p "Enter an available user name: " name
       read -r -p "Enter users new name: " newname
       read -r -p "Enter users new home directory <enter for default /home/$newname>: " newhome
    fi

    newhome=${newhome:-/home/$newname}

    if [[ ! $force ]]; then 
     echo "Changing $name to $newname with home $newhome"
     echo sudo usermod -l $newname $name
     echo sudo groupmod -n $newname $name
     echo sudo usermod --d $newhome --m $name
     confirm -s "These are the commands that will be run.  Do you want to continue?" || return 1
    fi

    sudo usermod -l $newname $name
    echo sudo groupmod -n $newname $name
    echo sudo usermod --d $newhome --m $name
}