#create hostname account with root privelages.
function create_user () {

install_log "Create Exit user account"

if [ $(id -u) -eq 0 ]; then
	read -p "Enter username : " username
	read -s -p "Enter password : " password
	egrep "^$username" /etc/passwd >/dev/null
	if [ $? -eq 0 ]; then
		echo "$username exists!"
		exit 1
	else
		pass=$(perl -e 'print crypt($ARGV[0], "password")' $password)
		useradd -m -p $pass $username
    sudo adduser $username sudo
		[ $? -eq 0 ] && echo "User has been added to system!" || echo "Failed to add a user!"
	fi
else
	echo "Only root may add a user to the system"
	exit 2
fi

}

# Outputs a Exit Install log line
function install_log() {
    echo -e "\033[1;32mexit Install: $*\033[m"
}

# Outputs a Exit Install Error log line and exits with status code 1
function install_error() {
    echo -e "\033[1;37;41mexit Install Error: $*\033[m"
    exit 1
}

# Outputs a Exit Warning line
function install_warning() {
    echo -e "\033[1;33mAdvisory: $*\033[m"
}

# Outputs a welcome message
function display_welcome() {
    raspberry='\033[0;35m'
    green='\033[1;32m'
    cyan='\033[1;36m'

    echo -e "${cyan}\n"
    # echo -e "  ____                 _       _ "
    # echo -e " |  _ \  __ _  ___  __| | __ _| |_   _ ___ "
    # echo -e " | | | |/ _  |/ _ \/ _  |/ _  | | | | / __| "
    # echo -e " | |_| | (_| |  __/ (_| | (_| | | |_| \__ \ "
    # echo -e " |____/ \__,_|\___|\__,_|\__,_|_|\__,_|___/ "
    # echo -e "${raspberry}  ____  _   _    _                 ____            __ _  "
    # echo -e " / ___|| \ | |  / \   _ __  _ __  / ___|_ __ __ _ / _| |_ ___ _ __  "
    # echo -e " \___ \|  \| | / _ \ |  _ \|  _ \| |   |  __/ _  | |_| __/ _ \  __|  "
    # echo -e "  ___) | |\  |/ ___ \| |_) | |_) | |___| | | (_| |  _| ||  __/ |  "
    # echo -e " |____/|_| \_/_/   \_\ .__/| .__/ \____|_|  \__,_|_|  \__\___|_|  "
    # echo -e "                     |_|   |_| TM  "
    echo -e "${cyan}by Minotaurware.net "
    echo -e "${green}\n"
    echo -e "Exit setup tool for SBCs."
    echo -e "The Quick Installer will guide you through a few easy steps\n\n"
}

### NOTE: all the below functions are overloadable for system-specific installs
### NOTE: some of the below functions MUST be overloaded due to system-specific installs
# Runs a system software update to make sure we're using all fresh packages

function update_system_packages() {
    # OVERLOAD THIS
    install_error "No function definition for update_system_packages"
}

# Installs additional dependencies using system package manager
function install_dependencies() {
    # OVERLOAD THIS
    install_error "No function definition for install_dependencies"
}

# Halts lokinet to allow for modifications to it
function stop_lokinet(){
    sudo systemctl stop lokinet.service
}

# # Verifies existence and permissions of exit directory
# function create_exit_directory() {
#     install_log "Creating exit files directory"
#     exit_dir="/home/$username/exit"
#
#     if [ -d "$exit_dir" ]; then
#         sudo mv $exit_dir "$exit_dir.`date +%F-%R`" || install_error "Unable to move old '$exit_dir' out of the way"
#     fi
#     sudo mkdir -p "$exit_dir" || install_error "Unable to create directory '$exit_dir'"
#     sudo chown -R $username:$username "$exit_dir" || install_error "Unable to change file ownership for '$exit_dir'"
# }
#
# # Fetches latest files from github for basic exit
# function download_latest_files() {
#     if [ -d "$exit_dir" ]; then
#         sudo mv $exit_dir "$exit_dir.`date +%F-%R`" || install_error "Unable to remove old snap directory"
#     fi
#
#     install_log "Cloning latest files from github"
#     git clone --depth 1 https://github.com/necro-nemesis/SBC-Lokinet-Micro-Exit $exit_dir || install_error "Unable to download files from github"
#
# #handle changes to resolvconf giving nameserver 127.3.2.1 priority.
# 		sudo systemctl stop resolvconf
# 		sudo mv $exit_dir/head /etc/resolvconf/resolv.conf.d/head || install_error "Unable to move resolvconf head file"
# 		sudo rm /etc/resolv.conf
# 		sudo ln -s /etc/resolvconf/run/resolv.conf /etc/resolv.conf
# 		sudo resolvconf -u || install_error "Unable to update resolv.conf"
# 		sudo systemctl start resolvconf
# }
#
# # Sets files ownership in exit directory
# function change_file_ownership() {
#     if [ ! -d "$exit_dir" ]; then
#         install_error "exit directory doesn't exist"
#     fi
#
#     install_log "Changing file ownership in exit directory"
#     sudo chown -R $username:$username "$exit_dir" || install_error "Unable to change file ownership for 'exit_dir'"
# 		sudo chmod -R 0755 "$exit_dir" || install_error "Unable to change permissions for 'exit_dir'"
# 		sudo mv $exit_dir/exit /usr/local/bin
# }

function configure_exit() {

		#append /var/lib/lokinet/lokinet.ini
		sed -i 's#\#keyfile=#keyfile=/var/lib/lokinet/exit.private#g' /var/lib/lokinet/lokinet.ini
		sed -i 's#\#min-connections=4#min-connections=8#g' /var/lib/lokinet/lokinet.ini
		sed -i 's#\#max-connections=6#max-connections=16#g' /var/lib/lokinet/lokinet.ini
		sed -i 's#\#exit=0#exit=true#g' /var/lib/lokinet/lokinet.ini
		sed -i 's#\#reachable=1#reachable=1#g' /var/lib/lokinet/lokinet.ini
		sed -i 's#\#ifaddr=#ifaddr=172.16.0.1/16#g' /var/lib/lokinet/lokinet.ini
		sed -i 's#\#paths=6#paths=8#g' /var/lib/lokinet/lokinet.ini
		sed -i 's#\#net.ipv4.ip_forward=1#net.ipv4.ip_forward = 1#g' /etc/sysctl.conf
		sudo sysctl -p /etc/sysctl.conf
		sudo systemctl restart lokinet


		#clean out installer files
		sudo rm -r $exit_dir/installers || install_error "Unable to remove installers"
    sudo rm -r /tmp/exit || install_error "Unable to remove /tmp/exit folder"

		#provide option to launch and display lokinet address

    cyan='\033[1;36m'
    echo -e "${cyan}\n"
    # echo -e "  ____                 _       _  "
    # echo -e " |  _ \  __ _  ___  __| | __ _| |_   _  __  "
    # echo -e " | | | |/ _  |/ _ \/ _  |/ _  | | | | / __|  "
    # echo -e " | |_| | (_| |  __/ (_| | (_| | | |_| \__ \  "
    # echo -e " |____/ \__,_|\___|\__,_|\__,_|_|\__,_|___/  "
    echo -e " by Minotaurware.net  "
		install_log "SBC Lokinet Micro Exit setup has completed your installation"
		IP="127.3.2.1"
		exit_address=$(host -t cname localhost.loki $IP | awk '/alias for/ { print $6 }')
		install_warning "Your Lokinet Address is:\nhttp://${exit_address}"
		install_warning "Place your exit in ${exit_dir}"
    echo -n "Do you wish to go live with exit? [y/N]: "
    read answer
    if [[ $answer != "y" ]]; then
        echo "Exit not launched. Exiting installation"
        exit 0
    fi
    install_log "Exit Launching"
		sudo systemctl restart lokinet
		exit 0 || install_error "Unable to exit"
}

function install_Exit() {
    display_welcome
    update_system_packages
    install_dependencies
		stop_lokinet
    create_user
    # create_exit_directory
    # download_latest_files
    # change_file_ownership
    configure_exit
}