#!/bin/bash

unknown_os ()
{
  echo "Unfortunately, your operating system distribution and version are not supported by this script."
  echo
  echo "You can override the OS detection by setting os= and dist= prior to running this script."
  echo "You can find a list of supported OSes and distributions on our website: https://www.emqx.com/en/try?product=nanomq"
  echo
  echo "For example, to force Ubuntu Trusty: os=ubuntu dist=trusty ./script.sh"
  echo
  echo "Please email contact@emqx.io and let us know if you run into any issues."
  exit 1
}

gpg_check ()
{
  echo "Checking for gpg..."
  if command -v gpg > /dev/null; then
    echo "Detected gpg..."
  else
    echo "Installing gnupg for GPG verification..."
    apt-get install -y gnupg
    if [ "$?" -ne "0" ]; then
      echo "Unable to install GPG! Your base system has a problem; please check your default OS's package repositories because GPG should work."
      echo "Repository installation aborted."
      exit 1
    fi
  fi
}

curl_check ()
{
  echo "Checking for curl..."
  if command -v curl > /dev/null; then
    echo "Detected curl..."
  else
    echo "Installing curl..."
    apt-get install -q -y curl
    if [ "$?" -ne "0" ]; then
      echo "Unable to install curl! Your base system has a problem; please check your default OS's package repositories because curl should work."
      echo "Repository installation aborted."
      exit 1
    fi
  fi
}

install_debian_keyring ()
{
  if [ "${os,,}" = "debian" ]; then
    echo "Installing debian-archive-keyring which is needed for installing "
    echo "apt-transport-https on many Debian systems."
    apt-get install -y debian-archive-keyring &> /dev/null
  fi
}


detect_os ()
{
  if [[ ( -z "${os}" ) && ( -z "${dist}" ) ]]; then
    # some systems dont have lsb-release yet have the lsb_release binary and
    # vice-versa
    if [ -e /etc/lsb-release ]; then
      . /etc/lsb-release

      if [ "${ID}" = "raspbian" ]; then
        os=${ID}
        dist=`cut --delimiter='.' -f1 /etc/debian_version`
      else
        os=${DISTRIB_ID}
        dist=${DISTRIB_CODENAME}

        if [ -z "$dist" ]; then
          dist=${DISTRIB_RELEASE}
        fi
      fi

    elif [ `which lsb_release 2>/dev/null` ]; then
      dist=`lsb_release -c | cut -f2`
      os=`lsb_release -i | cut -f2 | awk '{ print tolower($1) }'`

    elif [ -e /etc/debian_version ]; then
      # some Debians have jessie/sid in their /etc/debian_version
      # while others have '6.0.7'
      os=`cat /etc/issue | head -1 | awk '{ print tolower($1) }'`
      if grep -q '/' /etc/debian_version; then
        dist=`cut --delimiter='/' -f1 /etc/debian_version`
      else
        dist=`cut --delimiter='.' -f1 /etc/debian_version`
      fi

    else
      unknown_os
    fi
  fi

  if [ -z "$dist" ]; then
    unknown_os
  fi

  # remove whitespace from OS and dist name
  os="${os// /}"
  dist="${dist// /}"

  echo "Detected operating system as $os/$dist."
}

detect_version_id () {
  # detect version_id and round down float to integer
  if [ -f /etc/os-release ]; then
    . /etc/os-release
    version_id=${VERSION_ID%%.*}
  elif [ -f /usr/lib/os-release ]; then
    . /usr/lib/os-release
    version_id=${VERSION_ID%%.*}
  else
    version_id="1"
  fi
}

main ()
{
  detect_os
  curl_check
  gpg_check
  detect_version_id

  # Need to first run apt-get update so that apt-transport-https can be
  # installed
  echo -n "Running apt-get update... "
  apt-get update &> /dev/null
  echo "done."

  # Install the debian-archive-keyring package on debian systems so that
  # apt-transport-https can be installed next
  install_debian_keyring

  echo -n "Installing apt-transport-https... "
  apt-get install -y apt-transport-https &> /dev/null
  echo "done."


  gpg_key_url="https://packages.emqx.com/emqx/nanomq/gpgkey"
  apt_config_url="https://assets.emqx.com/scripts/emqx_nanomq.list"

  apt_source_path="/etc/apt/sources.list.d/emqx_nanomq.list"
  gpg_keyring_path="/usr/share/keyrings/emqx_nanomq-archive-keyring.gpg"

  echo -n "Installing $apt_source_path..."

  # create an apt config file for this repository
  curl -sSf "${apt_config_url}" > $apt_source_path
  curl_exit_code=$?

  if [ "$curl_exit_code" = "22" ]; then
    echo
    echo
    echo -n "Unable to download repo config from: "
    echo "${apt_config_url}"
    echo
    echo "This usually happens if your operating system is not supported by "
    echo "www.emqx.com, or this script's OS detection failed."
    echo
    echo "You can override the OS detection by setting os= and dist= prior to running this script."
    echo "You can find a list of supported OSes and distributions on our website: https://www.emqx.com/en/try?product=nanomq"
    echo
    echo "For example, to force Ubuntu Trusty: os=ubuntu dist=trusty ./script.sh"
    echo
    echo "If you are running a supported OS, please email contact@emqx.io and report this."
    [ -e $apt_source_path ] && rm $apt_source_path
    exit 1
  elif [ "$curl_exit_code" = "35" -o "$curl_exit_code" = "60" ]; then
    echo "curl is unable to connect to packages.emqx.com over TLS when running: "
    echo "    curl ${apt_config_url}"
    echo "This is usually due to one of two things:"
    echo
    echo " 1.) Missing CA root certificates (make sure the ca-certificates package is installed)"
    echo " 2.) An old version of libssl. Try upgrading libssl on your system to a more recent version"
    echo
    echo "Contact contact@emqx.io with information about your system for help."
    [ -e $apt_source_path ] && rm $apt_source_path
    exit 1
  elif [ "$curl_exit_code" -gt "0" ]; then
    echo
    echo "Unable to run: "
    echo "    curl ${apt_config_url}"
    echo
    echo "Double check your curl installation and try again."
    [ -e $apt_source_path ] && rm $apt_source_path
    exit 1
  else
    echo "done."
  fi

  echo -n "Importing packagecloud gpg key... "
  # import the gpg key
  curl -fsSL "${gpg_key_url}" | gpg --dearmor > ${gpg_keyring_path}
  # check for os/dist based on pre debian stretch
  if
  { [ "${os,,}" = "debian" ] && [ "${version_id}" -lt 9 ]; } ||
  { [ "${os,,}" = "ubuntu" ] && [ "${version_id}" -lt 16 ]; } ||
  { [ "${os,,}" = "linuxmint" ] && [ "${version_id}" -lt 19 ]; } ||
  { [ "${os,,}" = "raspbian" ] && [ "${version_id}" -lt 9 ]; } ||
  { { [ "${os,,}" = "elementaryos" ] || [ "${os,,}" = "elementary" ]; } && [ "${version_id}" -lt 5 ]; }
  then
    # move to trusted.gpg.d
    mv ${gpg_keyring_path} /etc/apt/trusted.gpg.d/emqx_nanomq.gpg
  fi
  echo "done."

  echo -n "Running apt-get update... "
  # update apt on this system
  apt-get update &> /dev/null
  echo "done."

  echo
  echo "The repository is setup! You can now install packages."
}

main
