#!/bin/bash -e
#
# Take a look
# https://www.erlang-solutions.com/downloads/
#
# then Look at the download URL, like
# href="https://packages.erlang-solutions.com/erlang/debian/pool/esl-erlang_23.2.3-1~ubuntu~xenial_arm64.deb"
#
# The version number would be
# 23.2.3-1

#-----------
# VARIABLES
#-----------

ERLANG_VERSION=${ERLANG_VERSION-23.2-1}
LINUX_DISTRIBUTION=${LINUX_DISTRIBUTION-$(lsb_release -cs)}

#-----------
# HELPERS
#-----------

set_env()
{
  KEY=$1
  VAL=$2
  echo "export $KEY=$VAL" >> $HOME/.bash_aliases
}

#-----------
# INSTALLER
#-----------

if [ "$(which brew)" == "" ]; then
  LINUX_DISTRIBUTION=${LINUX_DISTRIBUTION-$(lsb_release -cs)}
  locale-gen en_US.UTF-8
  set_env ERLANG_VERSION $ERLANG_VERSION
  source $HOME/.bash_aliases

  apt-get update
  apt-get install -y wget git build-essential libsctp1
  wget https://packages.erlang-solutions.com/erlang/debian/pool/esl-erlang_${ERLANG_VERSION}~ubuntu~${LINUX_DISTRIBUTION}_amd64.deb
  dpkg --force-depends -i esl-erlang_${ERLANG_VERSION}~ubuntu~${LINUX_DISTRIBUTION}_amd64.deb
else
  brew install erlang
fi