#!/usr/bin/env sh

set -eu

INSTALLPATH=${INSTALLPATH:-/usr/local/bin}

happyexit() {
  echo "Installed version:"
  echo "$(talosctl version 2>/dev/null )"
  echo ""
  echo "Now run:"
  echo ""
  echo "  talosctl cluster create                  # install a local test cluster"
  echo "  talosctl dashboard                       # If you have created a cluster, launch the dashboard"
  echo ""
  echo "Looking for more? Visit https://talos.dev/latest"
  echo ""
  exit 0
}

validate_checksum() {
  filename=$1
  url="https://github.com/siderolabs/talos/releases/latest/download/sha256sum.txt"
  SHA=$(curl --proto '=https' --tlsv1.2 -sSfL "${url}" | grep "${filename}" | awk '{print $1 }')
  echo ""
  echo "Validating checksum..."

  case $checksumbin in
    *openssl)
      checksum=$($checksumbin dgst -sha256 "${filename}" | sed -e 's/^.* //')
      ;;
    *shasum)
      checksum=$($checksumbin -a256 "${filename}" | sed -e 's/ .*$//')
      ;;
  esac

  if [ "$checksum" != "$SHA" ]; then
    echo "Checksum validation failed." >&2
    return 1
  fi
  echo "Checksum valid."
  return 0
}

OS=$(uname -s)
arch=$(uname -m)
cli_arch=""
case $OS in
  CYGWIN* | MINGW64*)
    OS=windows-amd64.exe
    ;;
  Darwin | Linux | FreeBSD)
    case $arch in
      x86_64)
        cli_arch=amd64
        ;;
      armv8*)
        cli_arch=arm64
        ;;
      aarch64*)
        cli_arch=arm64
        ;;
      amd64|arm64)
        cli_arch=$arch
        ;;
      *)
        echo "There is no talosctl $OS support for $arch. Please open an issue with your platform details."
        exit 1
        ;;
    esac
    ;;
  *)
    echo "There is no talosctl support for $OS/$arch. Please open an issue with your platform details."
    exit 1
    ;;
esac
OS=$(echo $OS | tr '[:upper:]' '[:lower:]')

dstfile="${INSTALLPATH}/talosctl"

checksumbin=$(command -v openssl) || checksumbin=$(command -v shasum) || {
  echo "Failed to find checksum binary. Please install openssl or shasum."
  echo ""
  echo "You can also elect to just download/install https://github.com/siderolabs/talos/releases/latest/download/${srcfile}"
  echo "into ${dstfile}"
  exit 1
}

if [ -e "${dstfile}" ]; then
    echo ""
    echo "talosctl was already downloaded;  🎉"
    echo ""
    echo "To force re-downloading, delete '${dstfile}' then run me again."
    happyexit
fi

tmpdir=$(mktemp -d /tmp/talosctl.XXXXXX)
srcfile="talosctl-${OS}"
if [ -n "${cli_arch}" ]; then
  srcfile="${srcfile}-${cli_arch}"
fi

url="https://github.com/siderolabs/talos/releases/latest/download/${srcfile}"

(
  cd "$tmpdir"

  echo "Downloading ${srcfile}..."
  curl --proto '=https' --tlsv1.2 -fLO "${url}"
  echo "Download complete!"

  if ! validate_checksum "${srcfile}"; then
    exit 1
  fi
  echo ""
  exit
)

(
  super=''
  if [ ! -w "${INSTALLPATH}" ]; then
    if $(command -v sudo > /dev/null 2>&1); then
      super='sudo -E sh -c'
    elif $(command -v  su > /dev/null 2>&1); then
      super='su -c'
    fi
  fi

  if [ -z "${super}" ]; then
    mv "${tmpdir}"/"${srcfile}" "${dstfile}"
    chmod +x "${dstfile}"
  else
    ${super} 'mv "'${tmpdir}/${srcfile}'" "'${dstfile}'"'
    ${super} 'chmod +x "'${dstfile}'"'
  fi
)

rm -r "$tmpdir"

echo "talosctl was successfully installed 🎉"
echo ""
happyexit