import fs from 'node:fs';
import path from 'node:path';
import { fileURLToPath } from 'node:url';

const __filename = fileURLToPath(import.meta.url);
const __dirname = path.dirname(__filename);

const APP_ROOT_DIR = path.join(__dirname, '..');
const DEFAULT_DATA_DIR = path.join(APP_ROOT_DIR, 'data');

function resolveConfiguredDataDir(rawValue: string | undefined): string | undefined {
  const value = rawValue?.trim();
  if (!value) {
    return undefined;
  }
  return path.isAbsolute(value) ? value : path.resolve(APP_ROOT_DIR, value);
}

const configuredDataDir = resolveConfiguredDataDir(process.env.TWEETS2BSKY_DATA_DIR || process.env.APP_DATA_DIR);

export const DATA_DIR = configuredDataDir ?? DEFAULT_DATA_DIR;
export const USING_EXTERNAL_DATA_DIR = Boolean(configuredDataDir);

export const LEGACY_CONFIG_FILE = path.join(APP_ROOT_DIR, 'config.json');
export const DATA_CONFIG_FILE = path.join(DATA_DIR, 'config.json');
export const ACTIVE_CONFIG_FILE = USING_EXTERNAL_DATA_DIR ? DATA_CONFIG_FILE : LEGACY_CONFIG_FILE;

export const DB_PATH = path.join(DATA_DIR, 'database.sqlite');
export const JWT_SECRET_FILE_PATH = path.join(DATA_DIR, '.jwt-secret');
export const UPDATE_LOG_DIR = DATA_DIR;

fs.mkdirSync(DATA_DIR, { recursive: true });