#!/bin/sh
set -e

TIMESTAMP=$(date +%Y%m%d_%H%M%S)
BACKUP_DIR=/backups
PG_HOST=10.10.10.100

mkdir -p "$BACKUP_DIR/postgres/daily" "$BACKUP_DIR/postgres/weekly" "$BACKUP_DIR/volumes"

log() { echo "[$(date '+%H:%M:%S')] $1"; }

# ── PostgreSQL dumps ──────────────────────────────────────────────────────────
log "Starting PostgreSQL backups..."
for DB in $BACKUP_DATABASES; do
  OUTFILE="$BACKUP_DIR/postgres/daily/${DB}_${TIMESTAMP}.sql.gz"
  PGPASSWORD="$PG_SUPERPASS" pg_dump -h "$PG_HOST" -U postgres "$DB" | gzip > "$OUTFILE"
  log "  $DB → $(du -sh "$OUTFILE" | cut -f1)"
done

# Weekly full dump on Sundays
if [ "$(date +%u)" = "7" ]; then
  log "Weekly full dump..."
  PGPASSWORD="$PG_SUPERPASS" pg_dumpall -h "$PG_HOST" -U postgres \
    | gzip > "$BACKUP_DIR/postgres/weekly/full_${TIMESTAMP}.sql.gz"
fi

# ── Retention cleanup ─────────────────────────────────────────────────────────
find "$BACKUP_DIR/postgres/daily"  -name "*.gz" -mtime +7  -delete
find "$BACKUP_DIR/postgres/weekly" -name "*.gz" -mtime +28 -delete
log "Retention cleanup done"

# ── Rsync to remote ───────────────────────────────────────────────────────────
if [ -n "$BACKUP_REMOTE" ]; then
  log "Syncing to $BACKUP_REMOTE..."
  rsync -az --delete \
    -e "ssh -i /root/.ssh/id_ed25519 -o StrictHostKeyChecking=no" \
    "$BACKUP_DIR/" "$BACKUP_REMOTE"
  log "Sync complete"
fi

# ── Uptime Kuma heartbeat ─────────────────────────────────────────────────────
if [ -n "$KUMA_PUSH_URL" ]; then
  wget -qO- "$KUMA_PUSH_URL?status=up&msg=Backup+OK&ping=" > /dev/null 2>&1 || true
fi

log "Backup complete"