#!/usr/bin/env bash
# Install (and optionally enable) the ops-warden conservative worker systemd --user timer.
# WARDEN-WP-0021 T1. Build-stage, conservative tier only (triage + draft, never auto-send).
#
#   ./scripts/install-worker-timer.sh            # install units + env, DISABLED
#   ./scripts/install-worker-timer.sh --enable   # install + start the 15-min timer
#
# Kill switch (one command):
#   systemctl --user disable --now ops-warden-worker.timer
#   (or set WORKER_ENABLED=0 in ~/.config/warden/worker.env)
set -euo pipefail

ROOT="$(cd "$(dirname "$0")/.." && pwd)"
UNIT_DIR="$HOME/.config/systemd/user"
ENV_FILE="$HOME/.config/warden/worker.env"

if ! command -v systemctl >/dev/null 2>&1; then
  echo "systemctl not found — this host has no systemd. Use the cron fallback:" >&2
  echo "  */15 * * * * $ROOT/scripts/worker-tick.sh >> ~/.local/state/warden/worker-tick.log 2>&1" >&2
  exit 1
fi

mkdir -p "$UNIT_DIR" "$(dirname "$ENV_FILE")"
if [[ ! -f "$ENV_FILE" ]]; then
  install -m 600 "$ROOT/examples/worker.env.example" "$ENV_FILE"
  echo "wrote $ENV_FILE (review it)"
fi

# Substitute the repo path into the service unit at install time.
sed "s#@ROOT@#$ROOT#g" "$ROOT/systemd/ops-warden-worker.service" > "$UNIT_DIR/ops-warden-worker.service"
cp "$ROOT/systemd/ops-warden-worker.timer" "$UNIT_DIR/ops-warden-worker.timer"
systemctl --user daemon-reload
echo "installed: ops-warden-worker.{service,timer} → $UNIT_DIR"

if [[ "${1:-}" == "--enable" ]]; then
  systemctl --user enable --now ops-warden-worker.timer
  echo "ENABLED — next runs: systemctl --user list-timers ops-warden-worker.timer"
else
  echo "not enabled. start with: systemctl --user enable --now ops-warden-worker.timer"
fi
echo "kill switch: systemctl --user disable --now ops-warden-worker.timer  (or WORKER_ENABLED=0 in $ENV_FILE)"