#!/bin/bash

# Refer to Node.js install script
#
# Run as root or insert `sudo -E` before `bash`:
#
# curl -sL http://nextepc.org/static/setup_3.x | bash -
#   or
# wget -qO- http://nextepc.org/static/setup_3.x | bash -
#

PACKAGE="nextepc"
VERSION="1.0.1"

print_status() {
    echo
    echo "## $1"
    echo
}

if test -t 1; then # if terminal
    ncolors=$(which tput > /dev/null && tput colors) # supports color
    if test -n "$ncolors" && test $ncolors -ge 8; then
        termcols=$(tput cols)
        bold="$(tput bold)"
        underline="$(tput smul)"
        standout="$(tput smso)"
        normal="$(tput sgr0)"
        black="$(tput setaf 0)"
        red="$(tput setaf 1)"
        green="$(tput setaf 2)"
        yellow="$(tput setaf 3)"
        blue="$(tput setaf 4)"
        magenta="$(tput setaf 5)"
        cyan="$(tput setaf 6)"
        white="$(tput setaf 7)"
    fi
fi

print_bold() {
    title="$1"
    text="$2"

    echo
    echo "${red}================================================================================${normal}"
    echo "${red}================================================================================${normal}"
    echo
    echo -e "  ${bold}${yellow}${title}${normal}"
    echo
    echo -en "  ${text}"
    echo
    echo "${red}================================================================================${normal}"
    echo "${red}================================================================================${normal}"
}

bail() {
    echo 'Error executing command, exiting'
    exit 1
}

exec_cmd_nobail() {
    echo "+ $1"
    bash -c "$1"
}

exec_cmd() {
    exec_cmd_nobail "$1" || bail
}

uninstall() {
exec_cmd_nobail "deb-systemd-invoke stop nextepc-webui"
exec_cmd_nobail "systemctl disable nextepc-webui"
exec_cmd_nobail "rm -f /lib/systemd/system/${PACKAGE}-webui.service"
exec_cmd_nobail "systemctl daemon-reload"

exec_cmd "rm -rf ./${PACKAGE}-${VERSION}"
exec_cmd "rm -rf /usr/lib/node_modules/${PACKAGE}"
}

install() {

PRE_INSTALL_PKGS=""

if [ ! -x /usr/bin/mongod ]; then
    PRE_INSTALL_PKGS="${PRE_INSTALL_PKGS} mongodb"
fi

if [ ! -x /usr/bin/node ]; then
    PRE_INSTALL_PKGS="${PRE_INSTALL_PKGS} nodejs"
fi

if [ ! -x /usr/bin/curl ] && [ ! -x /usr/bin/wget ]; then
    PRE_INSTALL_PKGS="${PRE_INSTALL_PKGS} curl"
fi

print_status "Populating apt-get cache..."
exec_cmd 'apt-get update'

if [ "X${PRE_INSTALL_PKGS}" != "X" ]; then
    print_status "Installing packages required for setup:${PRE_INSTALL_PKGS}..."
    # This next command needs to be redirected to /dev/null or the script will bork
    # in some environments
    exec_cmd "apt-get install -y${PRE_INSTALL_PKGS} > /dev/null 2>&1"
fi

uninstall

print_status "Download the NextEPC Source Code (v${VERSION})..."
if [ -x /usr/bin/curl ]; then
    exec_cmd "curl -sLf 'https://github.com/nextepc/${PACKAGE}/archive/v${VERSION}.tar.gz' | tar zxf -"
    RC=$?
else
    exec_cmd "wget -qO- /dev/null 'https://github.com/nextepc/${PACKAGE}/archive/v${VERSION}.tar.gz' | tar zxf -"
    RC=$?
fi

print_status "Build the NextEPC WebUI..."
exec_cmd "cd ./${PACKAGE}-${VERSION}/webui && npm install && npm run build"

print_status "Install the NextEPC WebUI..."
exec_cmd "mv ./${PACKAGE}-${VERSION}/webui /usr/lib/node_modules/${PACKAGE}"
exec_cmd_nobail "chown -R nextepc:nextepc /usr/lib/node_modules/${PACKAGE}"

exec_cmd "cat << EOF > /lib/systemd/system/nextepc-webui.service
[Unit]
Description=NextEPC WebUI
BindTo=mongodb.service
After=networking.service mongodb.service

[Service]
Type=simple

WorkingDirectory=/usr/lib/node_modules/nextepc
Environment=NODE_ENV=production
ExecStart=/usr/bin/node server/index.js
Restart=always
RestartSec=2

[Install]
WantedBy=multi-user.target
EOF"

exec_cmd_nobail "systemctl daemon-reload"
exec_cmd "systemctl enable nextepc-webui"
exec_cmd "deb-systemd-invoke start nextepc-webui"

exec_cmd "rm -rf ./${PACKAGE}-${VERSION}"
}

## Defer setup until we have the complete script
install