# Activate the tanin-greet greetd config. greetd owns /etc/greetd/config.toml,
# so we can't package that path — install it from the shipped template here,
# backing up any existing (e.g. distro default / regreet) config once.
_activate() {
  local src=/usr/share/tanin/greetd/config.toml
  local dst=/etc/greetd/config.toml
  [ -f "$src" ] || return 0
  if [ -e "$dst" ] && ! grep -q 'tanin-greet' "$dst" 2>/dev/null && [ ! -e "$dst.tanin-bak" ]; then
    cp -a "$dst" "$dst.tanin-bak"
  fi
  install -Dm644 "$src" "$dst"
}

post_install() {
  _activate
  cat <<'EOF'
>> tanin-greet: greetd now launches the TANINUX greeter (backup: /etc/greetd/config.toml.tanin-bak)
   Enable the login screen with:  systemctl enable greetd   (disable any other DM first)
EOF
}

post_upgrade() {
  _activate
}

# Package files (incl. the greeter binary greetd is pointed at) are gone by the
# time post_remove runs, so restore the pre-tanin greetd config we backed up in
# _activate — otherwise greetd keeps launching a deleted greeter and login breaks.
post_remove() {
  local dst=/etc/greetd/config.toml
  if [ -e "$dst.tanin-bak" ]; then
    mv -f "$dst.tanin-bak" "$dst"
    echo ">> tanin-greet: restored the previous greetd config from $dst.tanin-bak" >&2
  else
    cat >&2 <<'EOF'
!! tanin-greet: WARNING — /etc/greetd/config.toml still points at the TANINUX
!! greeter, which was just REMOVED, and no backup (.tanin-bak) exists to restore.
!! greetd will fail to start (no login) until you edit /etc/greetd/config.toml
!! to reference an installed greeter (e.g. agreety) or disable greetd.
EOF
  fi
}