#!/usr/bin/env bash

# Description: Chatwoot installation script
# OS: Ubuntu 20.04 LTS
# Script Version: 1.0
# Run this script as root

set -eu -o pipefail
trap exit_handler EXIT

function exit_handler() {
  if [ "$?" -ne 0 ]; then
   echo -en "\nSome error has occured. Check '/var/log/chatwoot-setup.log' for details.\n"
   exit 1
  fi
}

if [ "$(id -u)" -ne 0 ]; then
  echo 'This script should be run as root.' >&2
  exit 1
fi

if [[ -z "$1" ]]; then
  BRANCH="master"
else
  BRANCH="$1"
fi

function get_domain_info() {
  read -rp 'Enter the domain/subdomain for Chatwoot (e.g., chatwoot.domain.com) :' domain_name
  read -rp 'Enter an email address for LetsEncrypt to send reminders when your SSL certificate is up for renewal :' le_email
  cat << EOF

This script will generate SSL certificates via LetsEncrypt and serve Chatwoot at
https://$domain_name. Proceed further once you have pointed your DNS to the IP of the instance.

EOF
  read -rp 'Do you wish to proceed? (yes or no): ' exit_true
  if [ "$exit_true" == "no" ]
  then
    exit 1
  fi
}

function install_dependencies() {
  apt update && apt upgrade -y
  apt install -y curl
  curl -sL https://deb.nodesource.com/setup_12.x | bash -
  curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | apt-key add -
  echo "deb https://dl.yarnpkg.com/debian/ stable main" | tee /etc/apt/sources.list.d/yarn.list
  apt update

  apt install -y \
      git software-properties-common imagemagick libpq-dev \
      libxml2-dev libxslt1-dev file g++ gcc autoconf build-essential \
      libssl-dev libyaml-dev libreadline-dev gnupg2 \
      postgresql-client redis-tools \
      nodejs yarn patch ruby-dev zlib1g-dev liblzma-dev \
      libgmp-dev libncurses5-dev libffi-dev libgdbm6 libgdbm-dev sudo
}

function install_databases() {
  apt install -y postgresql postgresql-contrib redis-server
}

function install_webserver() {
  apt install -y nginx nginx-full certbot python3-certbot-nginx
}

function configure_rvm() {
  adduser --disabled-login --gecos "" chatwoot

  gpg --keyserver hkp://keyserver.ubuntu.com --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3 7D2BAF1CF37B13E2069D6956105BD0E739499BDB
  gpg2 --keyserver hkp://keyserver.ubuntu.com --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3 7D2BAF1CF37B13E2069D6956105BD0E739499BDB
  curl -sSL https://get.rvm.io | bash -s stable
  adduser chatwoot rvm
}

function configure_db() {
  pg_pass=$(head /dev/urandom | tr -dc A-Za-z0-9 | head -c 15 ; echo '')
  sudo -i -u postgres psql << EOF
  \set pass `echo $pg_pass`
  CREATE USER chatwoot CREATEDB;
  ALTER USER chatwoot PASSWORD :'pass';
  ALTER ROLE chatwoot SUPERUSER;
  UPDATE pg_database SET datistemplate = FALSE WHERE datname = 'template1';
  DROP DATABASE template1;
  CREATE DATABASE template1 WITH TEMPLATE = template0 ENCODING = 'UNICODE';
  UPDATE pg_database SET datistemplate = TRUE WHERE datname = 'template1';
  \c template1
  VACUUM FREEZE;
EOF

  systemctl enable redis-server.service
  systemctl enable postgresql

}

function setup_chatwoot() {
  secret=$(head /dev/urandom | tr -dc A-Za-z0-9 | head -c 63 ; echo '')
  RAILS_ENV=production

  sudo -i -u chatwoot << EOF
  rvm --version
  rvm autolibs disable
  rvm install "ruby-3.0.2"
  rvm use 3.0.2 --default

  git clone https://github.com/chatwoot/chatwoot.git
  cd chatwoot
  git checkout "$BRANCH"
  bundle
  yarn

  cp .env.example .env
  sed -i -e "/SECRET_KEY_BASE/ s/=.*/=$secret/" .env
  sed -i -e '/REDIS_URL/ s/=.*/=redis:\/\/localhost:6379/' .env
  sed -i -e '/POSTGRES_HOST/ s/=.*/=localhost/' .env
  sed -i -e '/POSTGRES_USERNAME/ s/=.*/=chatwoot/' .env
  sed -i -e "/POSTGRES_PASSWORD/ s/=.*/=$pg_pass/" .env
  sed -i -e '/RAILS_ENV/ s/=.*/=$RAILS_ENV/' .env
  echo -en "\nINSTALLATION_ENV=linux_script" >> ".env"

  rake assets:precompile RAILS_ENV=production
EOF

}


function run_db_migrations(){
  sudo -i -u chatwoot << EOF
  cd chatwoot
  RAILS_ENV=production bundle exec rake db:create
  RAILS_ENV=production bundle exec rake db:reset
EOF

}


function configure_systemd_services() {
  cp /home/chatwoot/chatwoot/deployment/chatwoot-web.1.service /etc/systemd/system/chatwoot-web.1.service
  cp /home/chatwoot/chatwoot/deployment/chatwoot-worker.1.service /etc/systemd/system/chatwoot-worker.1.service
  cp /home/chatwoot/chatwoot/deployment/chatwoot.target /etc/systemd/system/chatwoot.target

  systemctl enable chatwoot.target
  systemctl start chatwoot.target
}


function setup_ssl() {
  echo "debug: setting up ssl"
  echo "debug: domain: $domain_name"
  echo "debug: letsencrypt email: $le_email"
  curl https://ssl-config.mozilla.org/ffdhe4096.txt >> /etc/ssl/dhparam
  wget https://raw.githubusercontent.com/chatwoot/chatwoot/develop/deployment/nginx_chatwoot.conf
  cp nginx_chatwoot.conf /etc/nginx/sites-available/nginx_chatwoot.conf
  certbot certonly --non-interactive --agree-tos --nginx -m "$le_email" -d "$domain_name"
  sed -i "s/chatwoot.domain.com/$domain_name/g" /etc/nginx/sites-available/nginx_chatwoot.conf
  ln -s /etc/nginx/sites-available/nginx_chatwoot.conf /etc/nginx/sites-enabled/nginx_chatwoot.conf
  systemctl restart nginx
  sudo -i -u chatwoot << EOF
  cd chatwoot
  sed -i "s/http:\/\/0.0.0.0:3000/https:\/\/$domain_name/g" .env
EOF
  systemctl restart chatwoot.target
}

function setup_logging() {
  touch /var/log/chatwoot-setup.log
  LOG_FILE="/var/log/chatwoot-setup.log"
}

function main() {

  setup_logging
  cat << EOF

***************************************************************************
              Chatwoot Installation (latest)
***************************************************************************

For more verbose logs, open up a second terminal and follow along using, `tail -f /var/log/chatwoot`.

EOF

  sleep 3
  read -rp 'Would you like to configure a domain and SSL for Chatwoot?(yes or no): ' configure_webserver

  if [ "$configure_webserver" == "yes" ]
  then
    get_domain_info
  fi

  echo -en "\n"
  read -rp 'Would you like to install Postgres and Redis? (Answer no if you plan to use external services): ' install_pg_redis

  if [ "$install_pg_redis" == "no" ]
  then
    echo "***** Skipping Postgres and Redis installation. ****"
  fi

  echo -en "\n➥ 1/9 Installing dependencies. This takes a while."
  install_dependencies &>> "${LOG_FILE}"

  if [ "$install_pg_redis" != "no" ]
  then
    echo "➥ 2/9 Installing databases"
    install_databases &>> "${LOG_FILE}"
  fi

  if [ "$configure_webserver" == "yes" ]
  then
    echo "➥ 3/9 Installing webserver"
    install_webserver &>> "${LOG_FILE}"
  fi

  echo "➥ 4/9 Setting up Ruby"
  configure_rvm &>> "${LOG_FILE}"

  if [ "$install_pg_redis" != "no" ]
  then
    echo "➥ 5/9 Setting up the database"
    configure_db &>> "${LOG_FILE}"
  fi

  echo "➥ 6/9 Installing Chatwoot. This takes a while."
  setup_chatwoot &>> "${LOG_FILE}"

  if [ "$install_pg_redis" != "no" ]
  then
    echo "➥ 7/9 Running migrations"
    run_db_migrations &>> "${LOG_FILE}"
  fi

  echo "➥ 8/9 Setting up systemd services"
  configure_systemd_services &>> "${LOG_FILE}"

  public_ip=$(curl http://checkip.amazonaws.com -s)
  
  if [ "$configure_webserver" != "yes" ]
  then
    cat << EOF

***************************************************************************
Woot! Woot!! Chatwoot server installation is complete.
The server will be accessible at http://$public_ip:3000

To configure a domain and SSL certificate, follow the guide at 
https://www.chatwoot.com/docs/deployment/deploy-chatwoot-in-linux-vm

Join the community at https://chatwoot.com/community
***************************************************************************
EOF
  else
    echo "➥ 9/9 Setting up SSL/TLS"
    setup_ssl &>> "${LOG_FILE}"
    cat << EOF

***************************************************************************
Woot! Woot!! Chatwoot server installation is complete.
The server will be accessible at https://$domain_name

Join the community at https://chatwoot.com/community
***************************************************************************
EOF
  fi

  if [ "$install_pg_redis" == "no" ]
  then
cat <<EOF
***************************************************************************
The database migrations had not run as Postgres and Redis were not installed
as part of the installation process. After modifying the environment
variables (in the .env file) with your external database credentials, run
the database migrations using the below command.
`RAILS_ENV=production bundle exec rails db:chatwoot_prepare`.
***************************************************************************
EOF
  fi

exit 0

}

main "$@"