#!/bin/bash
set -e

# Configuration
BACKUP_FILE="${BACKUP_FILE:-/backups/import.gz}"
RESTORE_DIR="/restore"

echo ">>> Phase 0: Wiping restore directory..."
rm -rf "${RESTORE_DIR:?}"/*

echo ">>> Phase 1: Extracting ${BACKUP_FILE} to ${RESTORE_DIR}..."
gunzip -c "${BACKUP_FILE}" | mbstream -x -C "${RESTORE_DIR}"

echo ">>> Phase 2: Metadata Check..."
cd "${RESTORE_DIR}"
if [ -f "mariadb_backup_checkpoints" ] && [ ! -f "xtrabackup_checkpoints" ]; then
    echo ">>> Linking mariadb_backup_checkpoints to xtrabackup_checkpoints..."
    ln -sf mariadb_backup_checkpoints xtrabackup_checkpoints
fi
if [ -f "mariadb_backup_info" ] && [ ! -f "xtrabackup_info" ]; then
    echo ">>> Linking mariadb_backup_info to xtrabackup_info..."
    ln -sf mariadb_backup_info xtrabackup_info
fi

echo ">>> Phase 3: Decompressing data..."
mariabackup --decompress --target-dir="${RESTORE_DIR}" --open-files-limit=65535

echo ">>> Phase 4: Preparing backup (Applying logs)..."
mariabackup --prepare --target-dir="${RESTORE_DIR}" --open-files-limit=65535

echo ">>> Restore preparation complete!"