#!/usr/bin/env bash
# =============================================================================
# backup.sh — dump the Postgres database to ./backups/expenses-<ts>.sql.gz
#
# Run from your laptop. Requires .env (for OCI_VM_NAME and SSH key) and
# uses the OCI CLI to look up the VM's public IP.
# =============================================================================

set -euo pipefail

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
ROOT_DIR="$(cd "$SCRIPT_DIR/.." && pwd)"
cd "$ROOT_DIR"

[ -f .env ] || { echo "ERROR: .env not found"; exit 1; }
set -a; source .env; set +a

: "${OCI_VM_NAME:=sk1-expense-tracker}"
: "${POSTGRES_USER:?POSTGRES_USER must be set in .env}"
: "${POSTGRES_DB:?POSTGRES_DB must be set in .env}"
: "${OCI_SSH_PRIVATE_KEY_PATH:=$HOME/.ssh/id_ed25519}"
OCI_SSH_PRIVATE_KEY_PATH="${OCI_SSH_PRIVATE_KEY_PATH/#\~/$HOME}"

TENANCY_OCID="$(oci iam compartment list --query 'data[0]."compartment-id"' --raw-output 2>/dev/null)"
COMPARTMENT_ID="${OCI_COMPARTMENT_ID:-$TENANCY_OCID}"

INSTANCE_ID="$(oci compute instance list --compartment-id "$COMPARTMENT_ID" \
  --display-name "$OCI_VM_NAME" --lifecycle-state RUNNING \
  --query 'data[0].id' --raw-output)"
[ -n "$INSTANCE_ID" ] && [ "$INSTANCE_ID" != "null" ] || { echo "ERROR: VM not found"; exit 1; }

VNIC_ID="$(oci compute instance list-vnics --instance-id "$INSTANCE_ID" --query 'data[0].id' --raw-output)"
PUBLIC_IP="$(oci network vnic get --vnic-id "$VNIC_ID" --query 'data."public-ip"' --raw-output)"

mkdir -p backups
TS="$(date +%Y%m%d-%H%M%S)"
OUT="backups/expenses-${TS}.sql.gz"

echo "[backup] dumping $POSTGRES_DB from $PUBLIC_IP..."
ssh -i "$OCI_SSH_PRIVATE_KEY_PATH" -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null \
  ubuntu@"$PUBLIC_IP" \
  "sg docker -c 'docker exec sk1-db pg_dump -U $POSTGRES_USER -Fc $POSTGRES_DB'" \
  | gzip > "$OUT"

SIZE="$(du -h "$OUT" | cut -f1)"
echo "[backup] saved $OUT ($SIZE)"