#!/usr/bin/bash -E

## CONSTANTS

readonly MIAOU_BASH_DIR=/opt/miaou-bash
readonly MAIN_TAR_GZ_URL="https://git.artcode.re/miaou/miaou-bash/archive/main.tar.gz"

## FUNCTIONS
function bootstrap {
  cd "$(mktemp -d)" || exit 3
  curl -s -O $MAIN_TAR_GZ_URL
  tar -xzf main.tar.gz --directory "$(dirname $MIAOU_BASH_DIR)"

  local source_bin="$MIAOU_BASH_DIR/bin/miaou-bash"
  local dest_bin="/usr/bin/miaou-bash"
  if ! cmp -s "$source_bin" "$dest_bin"; then
    cp -f "$source_bin" "$dest_bin"
  fi
  echo "miaou-bash deployed to: $MIAOU_BASH_DIR"
}

function assert_supported_distro {
  grep -E '^ID=debian|^ID_LIKE=debian' /etc/os-release ||
    grep -E '^ID=arch|^ID_LIKE=arch' /etc/os-release
}

## MAIN

set -Eeuo pipefail

[[ "$UID" -ne 0 ]] && echo 'root privilege required' && exit 1
! assert_supported_distro && echo 'unsupported distro: debian-like OR arch-like expected' && exit 2

export MIAOU_BASH_DIR
if [[ -d "$MIAOU_BASH_DIR" ]]; then
  miaou-bash "$MIAOU_BASH_DIR/lib/self-upgrade.bash"
else
  bootstrap
  miaou-bash "$MIAOU_BASH_DIR/lib/init.bash"
  echo "miaou-bash successfully installed"
fi