#!/usr/bin/env bash
set -euo pipefail

if [[ -z "${PRIMARY_DATABASE_URL:-}" ]]; then
  echo "PRIMARY_DATABASE_URL is required (replication-capable connection string)."
  exit 1
fi

BACKUP_DIR="${BACKUP_DIR:-./backups/postgres/base}"
RETENTION_DAYS="${RETENTION_DAYS:-7}"
TIMESTAMP="$(date -u +%Y%m%dT%H%M%SZ)"
WORK_DIR="${BACKUP_DIR}/fiddy_base_${TIMESTAMP}"
ARCHIVE_PATH="${BACKUP_DIR}/fiddy_base_${TIMESTAMP}.tar.gz"

mkdir -p "$BACKUP_DIR"

echo "Creating base backup directory snapshot..."
pg_basebackup \
  --dbname="$PRIMARY_DATABASE_URL" \
  --pgdata="$WORK_DIR" \
  --format=plain \
  --wal-method=stream \
  --checkpoint=fast \
  --write-recovery-conf \
  --progress \
  --verbose

echo "Compressing base backup..."
tar -C "$BACKUP_DIR" -czf "$ARCHIVE_PATH" "fiddy_base_${TIMESTAMP}"
rm -rf "$WORK_DIR"

echo "Pruning base backups older than ${RETENTION_DAYS} days..."
find "$BACKUP_DIR" -type f -name "fiddy_base_*.tar.gz" -mtime "+${RETENTION_DAYS}" -delete

echo "Base backup complete: $ARCHIVE_PATH"