#!/bin/bash
set -euo pipefail

SNAPSHOT_DIR="/opt/memento/backups/snapshots"
REMOTE_HOST="${BACKUP_REMOTE_HOST:-}"
REMOTE_PATH="${BACKUP_REMOTE_PATH:-/opt/memento-offsite-backups}"
LOG_FILE="/opt/memento/backups/backup.log"

log() {
  echo "[$(date '+%Y-%m-%d %H:%M:%S')] $1" | tee -a "$LOG_FILE"
}

TELEGRAM_BOT_TOKEN="${TELEGRAM_BOT_TOKEN:-}"
TELEGRAM_CHAT_ID="${TELEGRAM_CHAT_ID:-}"

send_alert() {
  if [ -n "$TELEGRAM_BOT_TOKEN" ] && [ -n "$TELEGRAM_CHAT_ID" ]; then
    curl -s -X POST "https://api.telegram.org/bot${TELEGRAM_BOT_TOKEN}/sendMessage" \
      -d chat_id="$TELEGRAM_CHAT_ID" -d text="$1" >/dev/null 2>&1 || true
  fi
}

log "=== Offsite backup sync ==="

if [ -z "$REMOTE_HOST" ]; then
  log "WARNING: No BACKUP_REMOTE_HOST configured. Skipping offsite sync."
  log "Set BACKUP_REMOTE_HOST=user@server in /opt/memento/.env.docker for offsite backups"
  exit 0
fi

LATEST=$(ls -t "$SNAPSHOT_DIR"/*.sql.gz 2>/dev/null | head -1)
if [ -z "$LATEST" ]; then
  log "ERROR: No snapshots to sync"
  send_alert "🚨 MEMENTO: Offsite backup failed - no snapshots found!"
  exit 1
fi

log "Syncing $LATEST to $REMOTE_HOST:$REMOTE_PATH"
rsync -az --chmod=F600 "$SNAPSHOT_DIR/" "${REMOTE_HOST}:${REMOTE_PATH}/" 2>&1 | tee -a "$LOG_FILE"

if [ $? -eq 0 ]; then
  log "Offsite sync complete"
else
  log "ERROR: Offsite sync failed!"
  send_alert "🚨 MEMENTO: Offsite backup sync FAILED! Check rsync connectivity."
  exit 1
fi