#!/bin/sh
# Offline backup of the live MRPGI vault — the accounts (argon2 hashes) and
# saved worlds that ONLY exist on the dealgod VPS and are NOT in git.
#
# Pulls /opt/mrpgi-vault/data down to this machine as a timestamped tarball,
# keeping the 30 most recent snapshots. Run it from anywhere.
#
#   ./mrpgi-vault/backup.sh
#   MRPGI_BACKUP_DIR=/some/where ./mrpgi-vault/backup.sh   # override location
#
# Restore onto the VPS (if the box is ever rebuilt):
#   tar -xzf vault-YYYYMMDD-HHMMSS.tar.gz            # gives ./data
#   scp -r data root@100.94.195.115:/opt/mrpgi-vault/
#   ssh root@100.94.195.115 'docker restart mrpgi-vault'
set -e

REMOTE="${MRPGI_VAULT_REMOTE:-root@100.94.195.115:/opt/mrpgi-vault/data}"
DEST="${MRPGI_BACKUP_DIR:-$HOME/MRPGI-vault-backups}"
KEEP=30

mkdir -p "$DEST"
STAMP=$(date +%Y%m%d-%H%M%S)
TMP=$(mktemp -d)
trap 'rm -rf "$TMP"' EXIT

scp -q -r "$REMOTE" "$TMP/data"
tar -czf "$DEST/vault-$STAMP.tar.gz" -C "$TMP" data

# prune to the newest $KEEP snapshots
ls -1t "$DEST"/vault-*.tar.gz 2>/dev/null | tail -n +$((KEEP + 1)) | while read -r old; do rm -f "$old"; done

COUNT=$(ls -1 "$DEST"/vault-*.tar.gz 2>/dev/null | wc -l | tr -d ' ')
SIZE=$(du -h "$DEST/vault-$STAMP.tar.gz" | cut -f1)
echo "backed up -> $DEST/vault-$STAMP.tar.gz ($SIZE; $COUNT snapshots kept)"