#!/bin/bash
# Nightly wiz-war ledger backup to DigitalOcean Spaces.
#   current/    - exact mirror of /var/lib/wizwar
#   snapshots/  - one dated copy per day, pruned after 90 days
# Ledgers are append-only JSONL; the game server never needs stopping.
set -u
BUCKET="kestrel-wizwar-backups"
SRC="/var/lib/wizwar"
LOG="/var/log/wizwar/backup.log"
STAMP=$(date +%Y-%m-%d)

if grep -q CHANGE_ME /root/.config/rclone/rclone.conf; then
  echo "$(date -Is) skipped: Spaces credentials not configured yet" >> "$LOG"
  exit 0
fi

{
  echo "=== $(date -Is) backup start"
  rclone sync "$SRC" "spaces:$BUCKET/wizwar/current" 2>&1
  rclone copy "$SRC" "spaces:$BUCKET/wizwar/snapshots/$STAMP" 2>&1
  # Prune dated snapshots older than 90 days (by directory name).
  CUTOFF=$(date -d "90 days ago" +%Y-%m-%d)
  rclone lsf "spaces:$BUCKET/wizwar/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/wizwar/snapshots/$day" 2>&1
    fi
  done
  echo "=== $(date -Is) backup done"
} >> "$LOG"