const path = require('path');
const fs = require('fs');

const CONFIG_DIR = path.join(__dirname, '.config');
const PHOTOS_PATH_FILE = path.join(__dirname, 'nas_config.txt');
const DB_PATH = path.join(CONFIG_DIR, 'nas.db');
const PASSWORD_FILE = path.join(CONFIG_DIR, '.credentials');
const DEFAULT_PORT = 9500;

function ensureConfigDir() {
  if (!fs.existsSync(CONFIG_DIR)) {
    fs.mkdirSync(CONFIG_DIR, { recursive: true });
  }
}

function getPhotosPath() {
  if (!fs.existsSync(PHOTOS_PATH_FILE)) return null;

  let raw = fs.readFileSync(PHOTOS_PATH_FILE, 'utf-8');

  // Strip UTF-8 BOM
  raw = raw.replace(/^\uFEFF/, '');
  // Strip ALL control characters (CR, LF, null, tabs, zero-width spaces, etc.)
  // except forward-slash and backslash which are path separators
  raw = raw.replace(/[\x00-\x09\x0B\x0C\x0E-\x1F\x7F\r\n]/g, '');
  // Strip zero-width / non-breaking unicode junk that can sneak in from copy-paste
  raw = raw.replace(/[\u200B\u200C\u200D\uFEFF\u00A0]/g, '');
  raw = raw.trim();

  // Take only the first line in case there are multiple lines
  raw = raw.split('\n')[0].trim();

  if (!raw) return null;

  // Return the path exactly as written — do NOT use path.resolve()
  // because it mangles Linux paths on Windows and vice versa
  return raw;
}

function setPhotosPath(p) {
  // Clean and write as plain UTF-8 with unix line ending, no BOM
  const clean = p.replace(/[\r\n\x00]/g, '').trim();
  fs.writeFileSync(PHOTOS_PATH_FILE, clean, 'utf-8');
}

module.exports = {
  CONFIG_DIR,
  PHOTOS_PATH_FILE,
  DB_PATH,
  PASSWORD_FILE,
  DEFAULT_PORT,
  ensureConfigDir,
  getPhotosPath,
  setPhotosPath,
};