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

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
# shellcheck source=00_env.sh
. "$SCRIPT_DIR/00_env.sh"

SEARCH_PATH="/"
DEPTH=2
TOP_N=25

usage() {
  printf 'Usage: %s [--path <path>] [--depth <N>] [--top <N>]\n' "$(basename "$0")"
}

while [[ "$#" -gt 0 ]]; do
  case "$1" in
    --path) SEARCH_PATH="${2:-}"; shift 2 ;;
    --depth) DEPTH="${2:-}"; shift 2 ;;
    --top) TOP_N="${2:-}"; shift 2 ;;
    -h|--help) usage; exit 0 ;;
    *) critical "Unknown argument: $1"; usage; exit 2 ;;
  esac
done

if ! [[ "$DEPTH" =~ ^[0-9]+$ ]]; then
  critical "--depth must be a non-negative integer"
  exit 2
fi

if ! [[ "$TOP_N" =~ ^[0-9]+$ ]] || (( TOP_N < 1 )); then
  critical "--top must be a positive integer"
  exit 2
fi

validate_path "$SEARCH_PATH" || exit 2
require_cmd du || exit 1
require_cmd sort || exit 1
require_cmd head || exit 1

section "Top Directories Under $SEARCH_PATH"
warning "Read-only scan. Permission errors can be normal without root access."

du -x -h --max-depth="$DEPTH" "$SEARCH_PATH" 2>/dev/null |
  sort -hr |
  head -n "$TOP_N" |
  tee -a "$LOG_FILE"

ok "No directories were modified."