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

APP_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
BACKUP_ROOT="${BACKUP_ROOT:-/var/backups/database-kesiswaan}"
TIMESTAMP="${TIMESTAMP:-$(date '+%Y-%m-%d-%H%M%S')}"
RETENTION_DAYS="${RETENTION_DAYS:-14}"
SOURCE_DIR="${SOURCE_DIR:-$APP_DIR/storage/app/public}"

abort() {
  printf '[ERROR] %s\n' "$1" >&2
  exit 1
}

log() {
  printf '[%s] %s\n' "$(date '+%Y-%m-%d %H:%M:%S')" "$1"
}

require_bin() {
  command -v "$1" >/dev/null 2>&1 || abort "Binary '$1' tidak ditemukan."
}

[[ -d "$SOURCE_DIR" ]] || abort "Folder sumber dokumen tidak ditemukan di $SOURCE_DIR"
require_bin tar

TARGET_DIR="$BACKUP_ROOT/files"
mkdir -p "$TARGET_DIR"
TARGET_FILE="$TARGET_DIR/storage-public-${TIMESTAMP}.tar.gz"

log "Memulai backup dokumen dari '$SOURCE_DIR'"
tar -czf "$TARGET_FILE" -C "$SOURCE_DIR" .

find "$TARGET_DIR" -type f -name '*.tar.gz' -mtime +"$RETENTION_DAYS" -delete || true

log "Backup dokumen selesai: $TARGET_FILE"
printf '%s\n' "$TARGET_FILE"