#!/bin/bash

# omarchy:summary=Install OpenClaw for the default agent as the self-updating copy under ~/.openclaw
# omarchy:args=<--check|--now>
# omarchy:examples=omarchy install openclaw cli --now | omarchy install openclaw cli --check
# omarchy:requires-sudo=true

# There is one OpenClaw on a machine, and it is the one under ~/.openclaw that
# upstream's install-cli.sh makes: a private Node and the package in a prefix
# the user owns, which `openclaw update` and the Control UI's Update button
# replace in place. A copy in /usr belongs to pacman, and upstream's updater
# refuses to touch it. The openclaw package is therefore the seed rather than
# the runtime: the release Omarchy ships and the installer that came with it.
# The CLI, the gateway service and the Install > AI web app all run this copy.
#
# Each mode is named outright, like omarchy-install-hermes-cli: the default
# agent asks --check first and opens a terminal for --now only on a no.

set -euo pipefail

mode=${1:-}

# Everything here runs the user's own files, --check included.
if (( EUID == 0 )); then
  echo "Run this command as your desktop user, without sudo." >&2
  exit 1
fi

# Omarchy's OpenClaw is the default one, in ~/.openclaw with the default unit,
# whatever another profile, unit or state directory a shell selects; a service
# installed from here would otherwise carry that selection.
unset OPENCLAW_PROFILE OPENCLAW_SYSTEMD_UNIT OPENCLAW_WRAPPER OPENCLAW_HOME OPENCLAW_STATE_DIR OPENCLAW_CONFIG_PATH

prefix="$HOME/.openclaw"
runtime_command="$prefix/bin/openclaw"
command_path="$HOME/.local/bin/openclaw"
seed=/usr/share/openclaw

# Usable means the command answers, not that the file is there: upstream's
# wrapper execs the prefix's own Node, so a prefix missing either fails here.
runtime_runs() {
  [[ -f $runtime_command && -x $runtime_command ]] &&
    timeout 30 "$runtime_command" --version >/dev/null 2>&1
}

# The name on PATH is a link to the runtime's command. A link already aimed
# there, even one left dangling by a removed runtime, is Omarchy's to rewrite;
# anything else at the path is the user's.
command_ours() {
  [[ ! -e $command_path && ! -L $command_path ]] || [[ $(readlink -- "$command_path") == "$runtime_command" ]]
}

# What omarchy-agent, the web app and a terminal run is whichever openclaw is
# first on PATH, and Omarchy puts /usr/bin and the mise shims ahead of
# ~/.local/bin, so the command has to resolve to the runtime from there.
on_path() {
  local found
  found=$(type -P openclaw) || return 1
  [[ $(realpath -m -- "$found") == "$(realpath -m -- "$runtime_command")" ]]
}

# Nothing yet, or the runtime's command.
path_clear() {
  ! type -P openclaw >/dev/null || on_path
}

# The package counts too: without it --now has a pacman step to take, and
# answering yes here would run that where no terminal can ask for a password.
installed() {
  omarchy-pkg-present openclaw && runtime_runs && on_path
}

# Whether a unit's ExecStart runs a program from under a path: the program
# itself, or the script it is handed. Later arguments and other lines can name
# ~/.openclaw whichever OpenClaw the unit starts.
unit_runs() {
  local words word
  read -ra words <<<"$(sed -n 's/^ExecStart=//p' "$1" | head -1)"
  if [[ ${words[0]:-} == "$2"* ]]; then
    return 0
  fi
  for word in "${words[@]:1}"; do
    if [[ $word != -* ]]; then
      [[ $word == "$2"* ]]
      return
    fi
  done
  return 1
}

# A gateway service already running some other OpenClaw. Upstream's installer
# rewrites a loaded gateway service to the copy it has just installed, so
# seeding beside one would take it over.
foreign_gateway() {
  local unit
  unit=$(unit_path gateway)
  [[ -f $unit ]] && ! unit_runs "$unit" "$prefix/" && ! unit_runs "$unit" "/usr/lib/node_modules/openclaw/"
}

# A service the openclaw package's own copy installed runs from
# /usr/lib/node_modules/openclaw, which that package no longer ships, and is
# moved to the runtime, where `openclaw update` can replace its code. A service
# running any other OpenClaw is the user's arrangement and stays. The --now
# steps below list these, and which were running, before anything changes.
unit_path() {
  echo "$HOME/.config/systemd/user/openclaw-$1.service"
}

# Stopped before anything is installed: still running the old code from deleted
# files, such a service holds the state directory the newer runtime has to
# migrate, which upstream's installer does the moment it finds one loaded.
stop_legacy_services() {
  local role
  for role in "${moving[@]}"; do
    if ! systemctl --user stop "openclaw-$role.service"; then
      echo "Could not stop the OpenClaw $role service, so OpenClaw was not moved to $prefix." >&2
      return 1
    fi
    if [[ " ${running[*]} " == *" $role "* ]]; then
      stopped+=("$role")
    fi
  done
}

# Not moved yet: still on the old copy, or running before and not now.
unsettled() {
  unit_runs "$(unit_path "$1")" "/usr/lib/node_modules/openclaw/" ||
    { [[ " ${running[*]} " == *" $1 "* ]] && ! systemctl --user is-active --quiet "openclaw-$1.service"; }
}

# Upstream's installer rewrites a loaded gateway itself, but only warns when
# the restart fails, so whatever is still unsettled is installed again from the
# runtime and then has to have settled.
rehome_services() {
  local role
  for role in "${moving[@]}"; do
    if unsettled "$role"; then
      echo "Moving the OpenClaw $role service to $prefix..."
      "$runtime_command" "$role" install --force || true
    fi
    if unsettled "$role"; then
      echo "Could not move the OpenClaw $role service to $prefix. Finish with: openclaw $role install --force" >&2
      return 1
    fi
  done
}

# Said on any failure that leaves a service this run stopped not running.
stopped_note() {
  local role
  for role in "${stopped[@]}"; do
    if ! systemctl --user is-active --quiet "openclaw-$role.service"; then
      echo "The OpenClaw $role service was stopped for this and is not running now." >&2
    fi
  done
}

case "$mode" in
--check)
  if installed; then exit 0; else exit 1; fi
  ;;
--now) ;;
*)
  echo "Usage: omarchy-install-openclaw-cli <--check|--now>" >&2
  exit 1
  ;;
esac

# Refused before anything is installed or touched: the command's name, what
# PATH finds, and a gateway running another OpenClaw all have to be clear.
if ! command_ours; then
  echo "$command_path is not the OpenClaw Omarchy set up. Move it aside, then run omarchy-install-openclaw-cli --now again." >&2
  exit 1
fi
if ! path_clear; then
  echo "'openclaw' on PATH is $(type -P openclaw), which is what Omarchy would run instead of $runtime_command." >&2
  echo "Remove it or reorder PATH, then run omarchy-install-openclaw-cli --now again." >&2
  exit 1
fi

# A runtime that already answers is never reinstalled: it may be past the
# packaged release by its own updates, and seeding would take it back.
seeding=false
if ! runtime_runs; then
  seeding=true
fi
if [[ $seeding == "true" ]] && foreign_gateway; then
  echo "The OpenClaw gateway service runs another OpenClaw, which setting one up in $prefix would take over." >&2
  echo "Remove that gateway with 'openclaw gateway uninstall', then run omarchy-install-openclaw-cli --now again." >&2
  exit 1
fi

if ! omarchy-pkg-present openclaw; then
  echo "Installing OpenClaw..."
  omarchy-pkg-add openclaw
fi
if [[ $seeding == "true" && ( ! -r $seed/install-cli.sh || ! -r $seed/openclaw.tgz ) ]]; then
  echo "The installed OpenClaw package cannot set up a self-updating OpenClaw. Run 'omarchy update', then try again." >&2
  exit 1
fi

# What the old package installed and what of it was running, read before
# anything changes.
moving=()
running=()
stopped=()
for role in gateway node; do
  if [[ -f $(unit_path "$role") ]] && unit_runs "$(unit_path "$role")" "/usr/lib/node_modules/openclaw/"; then
    moving+=("$role")
    if systemctl --user is-active --quiet "openclaw-$role.service"; then
      running+=("$role")
    fi
  fi
done

trap 'status=$?; (( status == 0 )) || stopped_note' EXIT
stop_legacy_services

if [[ $seeding == "true" ]]; then
  # Every choice the installer reads from the environment is named, so an
  # OPENCLAW_INSTALL_METHOD or OPENCLAW_PREFIX left in a shell cannot move it.
  echo "Setting up OpenClaw in $prefix..."
  bash "$seed/install-cli.sh" --install-method npm --prefix "$prefix" --version "$seed/openclaw.tgz" --no-onboard || true
  if ! runtime_runs; then
    echo "OpenClaw setup did not complete. Re-run this command after resolving the installer error." >&2
    exit 1
  fi
fi

mkdir -p "${command_path%/*}"
ln -sfn "$runtime_command" "$command_path"

rehome_services

if ! on_path; then
  echo "$runtime_command is ready, but 'openclaw' on PATH is $(type -P openclaw || echo missing), which is what Omarchy runs." >&2
  echo "Put ~/.local/bin on PATH, then run omarchy-install-openclaw-cli --now again." >&2
  exit 1
fi