# CONSTANTS

INSTALL_URL='https://git.artcode.re/miaou/miaou-bash/raw/branch/main/install.sh'

# FUNCTIONS

function container_upgrade {
  local container_version host_version
  host_version=$(<"$MIAOU_BASH_DIR"/.semver_git_tag)
  if [[ -f /var/lib/miaou-bash/semver_current ]]; then
    container_version=$(</var/lib/miaou-bash/semver_current)
  else
    container_version='M.m.p'
  fi
  if [[ "$container_version" == "$host_version" ]]; then
    echo -n "initiating new version: $host_version"
  else
    echo -n "upgrading from $container_version to $host_version"
  fi
  echo ' (Ctrl-c to bypass)'
  if sudo_root; then
    sudo -E miaou-bash "$MIAOU_BASH_DIR"/lib/initiate.bash
  else
    builtin exit 1
  fi
}

function development_upgrade {
  [[ "$MIAOU_BASH_MODE_OWNER" != "$USER" ]] &&
    >&2 echo "ERROR: development mode owned by: $MIAOU_BASH_MODE_OWNER" &&
    builtin exit 11

  cd "$MIAOU_BASH_DIR"/ || return 12 # should not happen
  [[ -n "$(git status --porcelain)" ]] &&
    >&2 echo 'ERROR: repository has uncommited changes!' &&
    builtin exit 12

  local git_output
  git_output=$(git pull 2>&1)
  if echo "$git_output" | grep -q 'up to date'; then
    echo 'already up-to-date (Ctrl-c to bypass reinitialization)'
  else
    echo 'git pull applied (Ctrl-c to bypass reinitialization)'
  fi
  if sudo_root; then
    sudo miaou-bash "$MIAOU_BASH_DIR"/lib/initiate.bash
  else
    builtin exit 1
  fi
}

function system_upgrade {
  local current latest
  current=$("$MIAOU_BASH_DIR"/bin/miaou-bash --version)
  latest=$("$MIAOU_BASH_DIR"/tools/wget_semver artcode miaou/miaou-bash)
  if [[ "$current" == "$latest" ]]; then
    echo "up-to-date version: $current (Ctrl-c to bypass reinitialization)"
    if sudo_root; then
      sudo miaou-bash "$MIAOU_BASH_DIR"/lib/initiate.bash
    else
      builtin exit 1
    fi
  else
    echo "new version available: $latest"
    #TODO: should download file self-upgrade.bash itself before calling it against
    perform_upgrade
  fi
}

function perform_upgrade {
  if sudo_root; then
    :
  else
    builtin exit 1
  fi
  local backup="$MIAOU_BASH_DIR".before_upgrade
  sudo mv "$MIAOU_BASH_DIR" "$backup"
  curl -s --output /tmp/miaou-bash-install.sh "$INSTALL_URL"

  # shellcheck disable=SC1091
  if source /tmp/miaou-bash-install.sh upgrade; then
    if [[ $(find "$backup"/hooks.d -maxdepth 1 -type f -not -name '.*' | wc -l) -gt 0 ]]; then
      sudo mv "$backup"/hooks.d/* "$MIAOU_BASH_DIR"/hooks.d/
    fi
    sudo -E "$MIAOU_BASH_DIR"/bin/miaou-bash "$MIAOU_BASH_DIR"/lib/initiate.bash
    sudo rm -rf "$backup"
  else
    echo "ERROR: trouble during self-upgrade: revert back"
    sudo rm -rf "$MIAOU_BASH_DIR"
    sudo mv "$backup" "$MIAOU_BASH_DIR"
    builtin exit 99
  fi
}

# MAIN

source "$MIAOU_BASH_DIR"/lib/functions.bash
fetch_mode
echo "upgrading mode: $MIAOU_BASH_MODE"
case "$MIAOU_BASH_MODE" in
hosted) container_upgrade ;;
development) development_upgrade ;;
system) system_upgrade ;;
esac