#!/usr/bin/bash -E
# shellcheck disable=all

## CONSTANTS

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")
  . "$MIAOU_BASH_DIR"/bin/miaou-bash "$MIAOU_BASH_DIR/lib/initiate.bash"
}

function assert_supported_distro {
  if ! grep -E '^ID=debian|^ID_LIKE=debian' /etc/os-release &&
    ! grep -E '^ID=arch|^ID_LIKE=arch' /etc/os-release; then
    local distro=$(grep -oP '^ID=\K(.*)' /etc/os-release)
    >&2 echo "unsupported GNU/Linux distribution: $distro"
    >&2 echo 'only debian-like OR arch-like currently supported'
    exit 2
  fi
}

function once_installed {
  [[ -d "$MIAOU_BASH_DIR" &&
    -L /etc/inputrc &&
    "$(readlink /etc/inputrc)" == "$MIAOU_BASH_DIR"/etc/inputrc ]]
}

## MAIN

set -Eeuo pipefail

assert_supported_distro
deployment_type_adjective="${1:-installed}"
[[ ! -v MIAOU_BASH_DIR ]] && MIAOU_BASH_DIR=/opt/miaou-bash && export MIAOU_BASH_DIR

if [[ "$UID" -ne 0 ]]; then
  sudo -vp 'root privilege required (SUDO): '
  curl -s https://git.artcode.re/miaou/miaou-bash/raw/branch/main/install2.sh | sudo bash
  source /etc/profile
elif once_installed; then
  . "$MIAOU_BASH_DIR"/bin/miaou-bash "$MIAOU_BASH_DIR/lib/self-upgrade.bash"
else
  bootstrap
  echo "miaou-bash successfully $deployment_type_adjective"
fi