#!/bin/bash
# Nightly ledger backup to DigitalOcean Spaces, beside wizwar's in the same bucket.
#   current/    - exact mirror of /var/lib/waving-hands
#   snapshots/  - one dated copy per day, pruned after 90 days
# Ledgers are append-only JSONL; the duel server never needs stopping.
# Sentry Crons check-in: /root/.waving-hands-sentry-cron holds the check-in
# URL (absent file = no check-ins).
set -u
BUCKET="kestrel-wizwar-backups"
PREFIX="waving-hands"
SRC="/var/lib/waving-hands"
LOG="/var/log/waving-hands/backup.log"
STAMP=$(date +%Y-%m-%d)
mkdir -p "$(dirname "$LOG")"
CRON_URL=$(cat /root/.waving-hands-sentry-cron 2>/dev/null || true)
checkin() { [ -n "$CRON_URL" ] && curl -sf -o /dev/null "$CRON_URL?status=$1" || true; }

if [ ! -s /root/.config/rclone/rclone.conf ]; then
  echo "$(date -Is) skipped: rclone is not configured" >> "$LOG"
  exit 0
fi

{
  echo "=== $(date -Is) backup start"
  checkin in_progress
  if rclone sync "$SRC" "spaces:$BUCKET/$PREFIX/current" --exclude 'rollup.jsonl' 2>&1 &&
     rclone copy "$SRC" "spaces:$BUCKET/$PREFIX/snapshots/$STAMP" 2>&1; then
    checkin ok
  else
    checkin error
  fi
  CUTOFF=$(date -d "90 days ago" +%Y-%m-%d)
  rclone lsf "spaces:$BUCKET/$PREFIX/snapshots/" --dirs-only 2>/dev/null | \
  while read -r d; do
    day="${d%/}"
    if [[ "$day" < "$CUTOFF" ]]; then
      echo "pruning snapshot $day"
      rclone purge "spaces:$BUCKET/$PREFIX/snapshots/$day" 2>&1
    fi
  done
  echo "=== $(date -Is) backup done"
} >> "$LOG" 2>&1