const path = require('path');
const fs = require('fs');
const fsp = require('fs-promise');

// Default Config
// Do not edit this, generate a config.<ENV>.js for your NODE_ENV
// or use ENV-VARS like PSITRANSFER_PORT=8000
const config = {
  "uploadDir": path.resolve(__dirname + '/data'),
  // admin settings (name, logo, ...) are stored here, default: <uploadDir>/.settings
  "settingsDir": '',
  // set to serve the app from a sub-path
  "baseUrl": '/',
  // use to set custom upload url (subfolder to baseUrl)
  "uploadAppPath": '/',
  "iface": '0.0.0.0',
  // set to false to disable HTTP
  "port": 3000,
  // HTTPS, set all 3 values to enable
  "sslPort": 8443,
  "sslKeyFile": false,
  "sslCertFile": false,
  // Force redirect to https
  // can be true or a specific url like https://example.com:8443
  // keep empty to disable
  "forceHttps": '',
  // Use trust proxy to show real IP on logs when reverse proxy are used
  // see https://expressjs.com/en/guide/behind-proxies.html for options
  "trustProxy": '',
  // retention options in seconds:label
  "retentions": {
    "one-time": "one time download",
    "3600": "1 Hour",
    "21600": "6 Hours",
    "86400": "1 Day",
    "259200": "3 Days",
    "432000": "5 Days",
    "604800": "7 Days",
    "1209600": "2 Weeks",
    "2419200": "4 Weeks",
    "4838400": "8 Weeks"
  },
  // retentions shown as buttons, all others are offered in a list box
  "quickRetentions": ['one-time', '86400', '259200', '432000', '604800'],
  // admin password, set to false to disable /admin page
  // to enable /admin page set your password like this:
  // "adminPass": "YourSecurePassword",
  "adminPass": false,
  // upload password, set to false to disable
  "uploadPass": false,
  // lifetime of the login token issued after a successful upload login (seconds)
  // the token is renewed on every use
  "tokenTtl": 60 * 60 * 24 * 7,
  // secret to sign login tokens. When empty it is derived from uploadPass and adminPass,
  // so changing one of the passwords invalidates all issued tokens
  "tokenSecret": '',
  // a bucket-password is mandatory, except for one-time downloads
  "requireBucketPassword": true,
  "defaultRetention": "604800",
  // expire every file after maxAge (eg never downloaded one-time files)
  "maxAge": 3600 * 24 * 75, // 75 days
  // maximum file-size for text previews in byte
  "maxPreviewSize": Math.pow(2, 20) * 2, // 2MB
  "mailTemplate": 'mailto:?subject=파일 전달&body=다운로드 링크: %%URL%%',
  // see https://github.com/expressjs/morgan
  // set to false to disable logging
  "accessLog": ':date[iso] :method :url :status :response-time :remote-addr',
  // event webhooks
  // invokes an HTTP POST to a url whenever a file is downloaded
  // for more info, see the webhooks section of docs/configuration.md
  "fileDownloadedWebhook": null,
  "fileUploadedWebhook": null,
  // Fallback language
  "defaultLanguage": "ko",
  // Limit upload size
  "maxFileSize": null, // Math.pow(2, 30) * 2, // 2GB
  "maxBucketSize": null, // Math.pow(2, 30) * 2, // 10GB
  "plugins": ['file-downloaded-webhook', 'file-uploaded-webhook'],
  // Disable the QR code button for download url sharing, set to true to disable
  "disableQrCode": false,
  // Defaults for the branding, each of them can be changed on the admin settings page
  "appName": 'Dodo Transfer',
  "appOwner": '아진산업(주) 전장선행개발팀',
  "appFromYear": 2026,
};

// Load NODE_ENV specific config
const envConfFile = path.resolve(__dirname, `config.${ process.env.NODE_ENV }.js`);
if (process.env.NODE_ENV && fsp.existsSync(envConfFile)) {
  Object.assign(config, require(envConfFile));
}

// Load config from ENV VARS
const BOOLEAN_KEYS = ['requireBucketPassword', 'disableQrCode'];
let envName;
for (let k in config) {
  envName = 'PSITRANSFER_' + k.replace(/([A-Z])/g, $1 => "_" + $1).toUpperCase();
  if (process.env[envName]) {
    const raw = process.env[envName];
    if (typeof config[k] === 'number') {
      config[k] = parseInt(raw, 10);
    } else if (BOOLEAN_KEYS.includes(k)) {
      // other keys that default to false (passwords, ssl files, ...) take a string
      config[k] = ['true', '1', 'yes', 'on'].includes(raw.trim().toLowerCase());
    } else if (Array.isArray(config[k])) {
      config[k] = raw.split(',').map(s => s.trim()).filter(Boolean);
    } else if (config[k] === null) {
      // null defaults are numbers (limits) or strings (urls)
      try { config[k] = JSON.parse(raw); } catch (e) { config[k] = raw; }
    } else if (typeof config[k] === 'object') {
      config[k] = JSON.parse(raw);
    } else {
      config[k] = raw;
    }
  }
}

if (!config.baseUrl.endsWith('/')) config.baseUrl = config.baseUrl + '/';
if (!config.uploadAppPath.endsWith('/')) config.uploadAppPath = config.uploadAppPath + '/';

config.uploadAppPath = config.baseUrl.substr(0, config.baseUrl.length - 1) + config.uploadAppPath;

config.uploadDir = path.resolve(config.uploadDir);
if (!config.settingsDir) config.settingsDir = path.join(config.uploadDir, '.settings');

// Retention sanity: ignore unknown keys instead of showing broken buttons
config.quickRetentions = config.quickRetentions.filter(key => {
  const known = Object.prototype.hasOwnProperty.call(config.retentions, key);
  if (!known) console.warn(`config: quickRetentions entry "${ key }" is not in retentions, ignored`);
  return known;
});
if (!Object.prototype.hasOwnProperty.call(config.retentions, String(config.defaultRetention))) {
  const fallback = Object.keys(config.retentions).find(k => k !== 'one-time');
  console.warn(`config: defaultRetention "${ config.defaultRetention }" is not in retentions, using "${ fallback }"`);
  config.defaultRetention = fallback;
}

// Load language files: English is the base, every other language overrides it
const langDir = path.resolve(__dirname, 'lang');
const base = require('./lang/en');
config.languages = {};
fs.readdirSync(langDir).forEach(file => {
  if (!file.endsWith('.js')) return;
  const code = file.replace(/\.js$/, '');
  config.languages[code] = code === 'en' ? base : { ...base, ...require(`./lang/${ code }`) };
});
if (!config.languages[config.defaultLanguage]) {
  console.warn(`config: defaultLanguage "${ config.defaultLanguage }" not found, using "en"`);
  config.defaultLanguage = 'en';
}

module.exports = config;