#!/bin/bash
#<pre><code>

# What does this do.. and why?
# (and why is it so complicated?)
#
# What this does
#
#   1. Sets some vars and asks some questions
#   2. Installs everything into a single place
#      (inculding deps like node.js, with the correct version)
#   3. Depending on OS, creates a user for the service
#   4. Depending on OS, register with system launcher
#
# Why
#
#   So that you can get a fully configured, running product,
#   with zero manual configuration in a matter of seconds -
#   and have an uninstall that's just as easy.
#
# Why so complicated?
#
#  To support nuance differences between various versions of
#  Linux, macOS, and Android, including whether it's being
#  installed with user privileges, as root, wit a system user
#  system daemon launcher, etc. Also, this is designed to be
#  reusable with many apps and services, so it's very variabled...

set -e
set -u

### http_bash exported by get.sh

my_email=${1:-}
my_relay=${2:-}
my_servernames=${3:-}
my_secret=${4:-}
my_user="telebit"
my_app="telebit"
my_bin="telebit.js"
my_name="Telebit Remote"
my_repo="telebit.js"
my_root=${my_root:-} # todo better install script
sudo_cmd="sudo"

if [ -z "${my_email}" ]; then
  echo ""
  echo ""
  echo "Telebit uses Greenlock for free automated ssl through Let's Encrypt."
  echo ""
  echo "To accept the Terms of Service for Telebit, Greenlock and Let's Encrypt,"
  echo "please enter your email."
  echo ""
  read -p "email: " my_email
  echo ""
  # UX - just want a smooth transition
  sleep 0.5
fi

if [ -z "${my_relay}" ]; then
  echo "What relay will you be using? (press enter for default)"
  echo ""
  read -p "relay [default: wss://telebit.cloud]: " my_relay
  echo ""
  # UX - just want a smooth transition
  sleep 0.5
fi

if [ -z "${my_servernames}" ]; then
  echo "What servername(s) will you be relaying here? (press enter for default)"
  echo ""
  read -p "domain [default: <random>.telebit.cloud]: " my_servernames
  echo ""
  # UX - just want a smooth transition
  sleep 0.5
fi

if [ -z "${my_secret}" ]; then
  echo "What's your authorization for the relay server? (press enter for default)"
  echo ""
  read -p "auth [default: new account]: " my_secret
  echo ""
  # UX - just want a smooth transition
  sleep 0.5
fi

echo ""

if [ -z "${TELEBIT_PATH:-}" ]; then
  echo 'TELEBIT_PATH="'${TELEBIT_PATH:-}'"'
  TELEBIT_PATH=/opt/$my_app
fi

echo "Installing $my_name to '$TELEBIT_PATH'"

echo "Installing node.js dependencies into '$TELEBIT_PATH'"
# v10.2+ has much needed networking fixes, but breaks ursa. v9.x has severe networking bugs. v8.x has working ursa, but requires tls workarounds"
NODEJS_VER="${NODEJS_VER:-v10}"
export NODEJS_VER
export NODE_PATH="$TELEBIT_PATH/lib/node_modules"
export NPM_CONFIG_PREFIX="$TELEBIT_PATH"
export PATH="$TELEBIT_PATH/bin:$PATH"
sleep 1
http_bash https://git.coolaj86.com/coolaj86/node-installer.sh/raw/branch/master/install.sh --no-dev-deps >/dev/null 2>/dev/null

my_tree="master"
my_node="$TELEBIT_PATH/bin/node"
my_npm="$my_node $TELEBIT_PATH/bin/npm"
my_tmp="$TELEBIT_PATH/tmp"
mkdir -p $my_tmp

echo "sudo mkdir -p '$TELEBIT_PATH'"
sudo mkdir -p "$TELEBIT_PATH"
sudo mkdir -p "$TELEBIT_PATH/etc"
sudo mkdir -p "$TELEBIT_PATH/var/log"
echo "sudo mkdir -p '/etc/$my_user/'"
sudo mkdir -p "/etc/$my_user/"

set +e
#https://git.coolaj86.com/coolaj86/telebit.js.git
#https://git.coolaj86.com/coolaj86/telebit.js/archive/:tree:.tar.gz
#https://git.coolaj86.com/coolaj86/telebit.js/archive/:tree:.zip
my_unzip=$(type -p unzip)
my_tar=$(type -p tar)
if [ -n "$my_unzip" ]; then
  rm -f $my_tmp/$my_app-$my_tree.zip
  http_get https://git.coolaj86.com/coolaj86/$my_repo/archive/$my_tree.zip $my_tmp/$my_app-$my_tree.zip
  # -o means overwrite, and there is no option to strip
  $my_unzip -o $my_tmp/$my_app-$my_tree.zip -d $TELEBIT_PATH/ > /dev/null 2>&1
  cp -ar  $TELEBIT_PATH/$my_repo/* $TELEBIT_PATH/ > /dev/null
  rm -rf $TELEBIT_PATH/$my_bin
elif [ -n "$my_tar" ]; then
  rm -f $my_tmp/$my_app-$my_tree.tar.gz
  http_get https://git.coolaj86.com/coolaj86/$my_repo/archive/$my_tree.tar.gz $my_tmp/$my_app-$my_tree.tar.gz
  ls -lah $my_tmp/$my_app-$my_tree.tar.gz
  $my_tar -xzf $my_tmp/$my_app-$my_tree.tar.gz --strip 1 -C $TELEBIT_PATH/
else
  echo "Neither tar nor unzip found. Abort."
  exit 13
fi
set -e

pushd $TELEBIT_PATH >/dev/null
  $my_npm install >/dev/null 2>/dev/null
popd >/dev/null

cat << EOF > $TELEBIT_PATH/bin/$my_app
#!/bin/bash
$my_node $TELEBIT_PATH/bin/$my_bin
EOF
chmod a+x $TELEBIT_PATH/bin/$my_app
echo "sudo ln -sf $TELEBIT_PATH/bin/$my_app /usr/local/bin/$my_app"
sudo ln -sf $TELEBIT_PATH/bin/$my_app /usr/local/bin/$my_app

set +e
if type -p setcap >/dev/null 2>&1; then
  #echo "Setting permissions to allow $my_app to run on port 80 and port 443 without sudo or root"
  echo "sudo setcap cap_net_bind_service=+ep $TELEBIT_PATH/bin/node"
  sudo setcap cap_net_bind_service=+ep $TELEBIT_PATH/bin/node
fi
set -e

set +e
# TODO for macOS https://apple.stackexchange.com/questions/286749/how-to-add-a-user-from-the-command-line-in-macos
if type -p adduser >/dev/null 2>/dev/null; then
  if [ -z "$(cat $my_root/etc/passwd | grep $my_user)" ]; then
    $sudo_cmd adduser --home $TELEBIT_PATH --gecos '' --disabled-password $my_user >/dev/null 2>&1
  fi
  #my_user=$my_app_name
  my_group=$my_user
elif [ -n "$(cat /etc/passwd | grep www-data:)" ]; then
  # Linux (Ubuntu)
  my_user=www-data
  my_group=www-data
elif [ -n "$(cat /etc/passwd | grep _www:)" ]; then
  # Mac
  my_user=_www
  my_group=_www
else
  # Unsure
  my_user=$(id -u -n) # $(whoami)
  my_group=$(id -g -n)
fi
set -e

my_config="$TELEBIT_PATH/etc/$my_app.yml"
mkdir -p "$(dirname $my_config)"
if [ ! -e "$my_config" ]; then
  #rsync -a examples/$my_app.yml "$my_config"
  echo "email: $my_email" >> "$my_config"
  if [ -n "$my_secret" ]; then
    echo "secret: $my_secret" >> "$my_config"
  fi
  if [ -n "$my_servernames" ]; then
    echo "servernames:\n  $my_servernames: {}" >> "$my_config"
  fi
  #echo "dynamic_ports:\n  []" >> "$my_config"
  cat usr/share/$my_app.tpl.yml >> "$my_config"
fi

my_config="$HOME/.config/$my_user/$my_app.yml"
mkdir -p "$(dirname $my_config)"
if [ ! -e "$my_config" ]; then
  echo "cli: true" >> "$my_config"
  echo "email: $my_email" >> "$my_config"
  if [ -n "$my_secret" ]; then
    echo "secret: $my_secret" >> "$my_config"
  fi
  cat usr/share/$my_app.tpl.yml >> "$my_config"
fi

my_config_link="/etc/$my_user/$my_app.yml"
if [ ! -e "$my_config_link" ]; then
  echo "sudo ln -sf '$my_config' '$my_config_link'"
  #sudo mkdir -p /etc/$my_user
  sudo ln -sf "$my_config" "$my_config_link"
fi

echo "sudo chown -R $my_user '$TELEBIT_PATH' '/etc/$my_user'"
sudo chown -R $my_user "$TELEBIT_PATH" "/etc/$my_user"

# ~/.config/systemd/user/
# %h/.config/telebit/telebit.yml
echo "### Adding $my_app is a system service"
echo "sudo rsync -a $TELEBIT_PATH/usr/share/dist/etc/systemd/system/$my_app.service /etc/systemd/system/$my_app.service"
sudo rsync -a "$TELEBIT_PATH/usr/share/dist/etc/systemd/system/$my_app.service" "/etc/systemd/system/$my_app.service"
sudo systemctl daemon-reload
echo "sudo systemctl enable $my_app"
sudo systemctl enable $my_app
echo "sudo systemctl start $my_app"
sudo systemctl restart $my_app

sleep 1
echo ""
echo ""
echo ""
echo "=============================================="
echo "  Privacy Settings in Config"
echo "=============================================="
echo ""
echo "The example config file /etc/$my_user/$my_app.yml opts-in to"
echo "contributing telemetrics and receiving infrequent relevant updates"
echo "(probably once per quarter or less) such as important notes on"
echo "a new release, an important API change, etc. No spam."
echo ""
echo "Please edit the config file to meet your needs before starting."
echo ""
sleep 2

echo ""
echo ""
echo "=============================================="
echo "Installed successfully. Last steps:"
echo "=============================================="
echo ""
echo "Edit the config and restart, if desired:"
echo ""
echo "    sudo vim /etc/$my_user/$my_app.yml"
echo "    sudo systemctl restart $my_app"
echo ""
echo "Or disabled the service and start manually:"
echo ""
echo "    sudo systemctl stop $my_app"
echo "    sudo systemctl disable $my_app"
echo "    $my_app --config /etc/$my_user/$my_app.yml"
echo ""
sleep 1