#!/usr/bin/env bash
# Install the lakehouse-auditor + lakehouse-context7-bridge systemd units.
# Idempotent: re-running just reloads + restarts.
#
# Usage (as root):
#   bash ops/systemd/install.sh
#
# What it does:
#   1. Copies *.service to /etc/systemd/system/
#   2. systemctl daemon-reload
#   3. systemctl enable --now both services
#   4. Prints post-install status

set -euo pipefail

UNIT_DIR="$(dirname "$(readlink -f "$0")")"
TARGET_DIR=/etc/systemd/system

UNITS=(
  lakehouse-auditor.service
  lakehouse-context7-bridge.service
  lakehouse-retention-sweep.service
  lakehouse-retention-sweep.timer
)

if [[ $EUID -ne 0 ]]; then
  echo "install.sh: must run as root (writes to $TARGET_DIR)" >&2
  exit 1
fi

for unit in "${UNITS[@]}"; do
  src="$UNIT_DIR/$unit"
  dst="$TARGET_DIR/$unit"
  if [[ ! -f "$src" ]]; then
    echo "install.sh: missing source $src" >&2
    exit 1
  fi
  echo "→ copy $unit"
  install -m 0644 "$src" "$dst"
done

echo "→ systemctl daemon-reload"
systemctl daemon-reload

for unit in "${UNITS[@]}"; do
  # For .timer units: enable + start the timer (which fires its
  # paired oneshot service on schedule). For long-running .service
  # units that DON'T have a timer: enable + restart so changes
  # land. For oneshot .service units that ARE driven by a timer,
  # do NOT enable/start them directly — the timer pulls them in.
  base="${unit%.*}"
  case "$unit" in
    *.timer)
      echo "→ enable + (re)start $unit"
      systemctl enable "$unit" >/dev/null
      systemctl restart "$unit"
      ;;
    *.service)
      # Skip if a paired .timer exists in this install set.
      paired_timer="${base}.timer"
      paired_in_set=0
      for u2 in "${UNITS[@]}"; do
        [[ "$u2" == "$paired_timer" ]] && paired_in_set=1 && break
      done
      if [[ $paired_in_set -eq 1 ]]; then
        echo "→ skip direct start of $unit (driven by $paired_timer)"
      else
        echo "→ enable + (re)start $unit"
        systemctl enable "$unit" >/dev/null
        systemctl restart "$unit"
      fi
      ;;
  esac
done

echo ""
echo "─── post-install status ───"
for unit in "${UNITS[@]}"; do
  active=$(systemctl is-active "$unit" 2>/dev/null || true)
  enabled=$(systemctl is-enabled "$unit" 2>/dev/null || true)
  printf "  %-44s active=%s enabled=%s\n" "$unit" "$active" "$enabled"
done
echo ""
echo "Live logs:   journalctl -u lakehouse-auditor.service -f"
echo "             journalctl -u lakehouse-retention-sweep.service -f"
echo "Pause:       touch /home/profit/lakehouse/auditor.paused"
echo "Resume:      rm /home/profit/lakehouse/auditor.paused"
echo "Sweep test:  systemctl start lakehouse-retention-sweep.service  # one-shot, completes immediately"
echo "Next sweep:  systemctl list-timers lakehouse-retention-sweep.timer"