#!/bin/sh
set -eux

# This script is written to be as POSIX as possible
# so it works fine for all Unix-like operating systems

test_cmd() {
  command -v "$1" >/dev/null
}

tmp_dir='/tmp'
# proxy version
lapce_new_ver="${1}"
# proxy directory
# eval to resolve '~' into proper user dir
eval lapce_dir="'${2}'"

if [ -e "${lapce_dir}/lapce" ]; then
  chmod +x "${lapce_dir}/lapce"

  lapce_installed_ver=$("${lapce_dir}/lapce" --version | cut -d'v' -f2)

  printf '[DEBUG]: Current proxy version: %s\n' "${lapce_installed_ver}"
  printf '[DEBUG]: New proxy version: %s\n' "${lapce_new_ver}"
  if [ "${lapce_installed_ver}" = "${lapce_new_ver}" ]; then
    printf 'Proxy already exists\n'
    exit 0
  else
    printf 'Proxy outdated. Replacing proxy\n'
    rm "${lapce_dir}/lapce"
  fi
fi

for _cmd in tar gzip uname; do
  if ! test_cmd "${_cmd}"; then
    printf 'Missing required command: %s\n' "${_cmd}"
    exit 1
  fi
done

# Currently only linux/darwin are supported
case $(uname -s) in
  Linux) os_name=linux ;;
  Darwin) os_name=darwin ;;
  *)
    printf '[ERROR] unsupported os'
  ;;
esac

# Currently only amd64/arm64 are supported
case $(uname -m) in
  x86_64|amd64|x64) arch_name=x86_64 ;;
  arm64|aarch64) arch_name=aarch64 ;;
  # riscv64) arch_name=riscv64 ;;
  *)
    printf '[ERROR] unsupported arch'
  ;;
esac

printf 'Switching to "%s"\n' "${tmp_dir}"
cd "${tmp_dir}"

lapce_download_url="https://github.com/lapce/lapce/releases/download/${lapce_new_ver}/lapce-proxy-${os_name}-${arch_name}.gz"

if test_cmd 'curl'; then
  # How old curl has these options? we'll find out
  printf 'Downloading using curl\n'
  curl --proto '=https' --tlsv1.2 -LfS -O "${lapce_download_url}"
  # curl --proto '=https' --tlsv1.2 -LZfS -o "${tmp_dir}/lapce-proxy-${os_name}-${arch_name}.gz" "${lapce_download_url}"
elif test_cmd 'wget'; then
  printf 'Downloading using wget\n'
  wget "${lapce_download_url}"
else
  printf 'curl/wget not found, failed to download proxy\n'
  exit 1
fi

printf 'Creating "%s"\n' "${lapce_dir}"
mkdir -p "${lapce_dir}"

printf 'Decompressing gzip\n'
gzip -d "${tmp_dir}/lapce-proxy-${os_name}-${arch_name}.gz"

printf 'Moving proxy to our dir\n'
mv -v "${tmp_dir}/lapce-proxy-${os_name}-${arch_name}" "${lapce_dir}/lapce"

printf 'Making it executable\n'
chmod +x "${lapce_dir}/lapce"

printf 'lapce-proxy installed\n'

exit 0