#!/bin/bash
#<pre><code>
set -e
set -u

# minimal os detection
my_os="$(uname -s | tr '[:upper:]' '[:lower:]')"

# https://github.com/golang/go/wiki/GoArm#supported-architectures
# minimal cpu arch detection
my_arch="$(uname -m)"
if [ "x86_64" == "$my_arch" ]; then
  my_arch="amd64"
elif [ "i386" == "$my_arch" ]; then
  my_arch="386"
elif [ -n "$($my_arch | grep arm)" ]; then
	if [ -n "$(uname -a | grep aarch64)" ]; then
		my_arch="arm64"
	elif [ -n "$(uname -a | grep armv8l)" ]; then
		my_arch="arm64"
	elif [ -n "$(uname -a | grep armv7l)" ]; then
		my_arch="armv7l"
	elif [ -n "$(uname -a | grep armv6l)" ]; then
		my_arch="armv6l"
	else
		echo "could not determine arm cpu architecture" >&2
		exit 1
	fi
else
	echo "could not determine cpu architecture" >&2
	exit 1
fi

# get optify for this cpu and arch
if [ -z "${OPTIFY_VERSION:-}" ]; then
  latest_version="$(curl -fsSL https://telebit.cloud/optify/latest)"
  OPTIFY_VERSION=$latest_version
  echo "Installing optify-$OPTIFY_VERSION (latest)"
else
  echo "Installing optify OPTIFY_VERSION=$OPTIFY_VERSION"
fi

# download to a tmp folder
#my_tmpdir="$(mktemp -d /tmp/optify.XXXXXXXX)"
my_tmpdir="$(mktemp -d -t optify.XXXXXXXX)"
my_url="https://telebit.cloud/optify/dist/${my_os}/${my_arch}/optify-${OPTIFY_VERSION}"
if [ -n "$(type -p curl || true)" ]; then
  my_out="$(curl -fsSL -o "$my_tmpdir/optify-${OPTIFY_VERSION}" "$my_url" || true)"
elif [ -n "$(type -p wget || true)" ]; then
  my_out="$(wget -q -c "$my_url" -O "$my_tmpdir/optify-${OPTIFY_VERSION}" || true)"
else
  echo "found neither wget nor curl" >&2
  exit 1
fi

# check for downloader success
chmod a+x "$my_tmpdir/optify-${OPTIFY_VERSION}"
"$my_tmpdir/optify-${OPTIFY_VERSION}" --install