#!/bin/sh
set -eu

schedule_file="${1:-/home/m/assistant-ops/assistant-postgres-backup.crontab}"
marker="/home/m/assistant-ops/backup-postgres.sh"
current="$(mktemp)"
updated="$(mktemp)"

cleanup() {
  rm -f -- "$current" "$updated"
}
trap cleanup EXIT HUP INT TERM

if [ ! -f "$schedule_file" ]; then
  echo "Cron schedule file not found: $schedule_file" >&2
  exit 1
fi

crontab -l >"$current" 2>/dev/null || true
grep -vF "$marker" "$current" >"$updated" || true
cat "$schedule_file" >>"$updated"
crontab "$updated"

matches="$(crontab -l | grep -Fc "$marker")"
if [ "$matches" -ne 1 ]; then
  echo "Expected one backup cron entry, found $matches" >&2
  exit 1
fi

echo "PostgreSQL backup cron entry installed"