import * as ACTIONS from 'constants/action_types';
import LANGUAGES from 'constants/languages';
import * as SETTINGS from 'constants/settings';

function getLocalStorageSetting(setting, fallback) {
  const localStorageVal = localStorage.getItem(`setting_${setting}`);
  return localStorageVal === null ? fallback : JSON.parse(localStorageVal);
}

const reducers = {};
const defaultState = {
  clientSettings: {
    instantPurchaseEnabled: getLocalStorageSetting(SETTINGS.INSTANT_PURCHASE_ENABLED, false),
    instantPurchaseMax: getLocalStorageSetting(SETTINGS.INSTANT_PURCHASE_MAX, {
      currency: 'LBC',
      amount: 0.1,
    }),
    showNsfw: getLocalStorageSetting(SETTINGS.SHOW_NSFW, false),
    showUnavailable: getLocalStorageSetting(SETTINGS.SHOW_UNAVAILABLE, true),
    welcome_acknowledged: getLocalStorageSetting(SETTINGS.NEW_USER_ACKNOWLEDGED, false),
    email_collection_acknowledged: getLocalStorageSetting(SETTINGS.EMAIL_COLLECTION_ACKNOWLEDGED),
    credit_required_acknowledged: false, // this needs to be re-acknowledged every run
    language: getLocalStorageSetting(SETTINGS.LANGUAGE, 'en'),
    theme: getLocalStorageSetting(SETTINGS.THEME, 'light'),
    themes: getLocalStorageSetting(SETTINGS.THEMES, []),
    automaticDarkModeEnabled: getLocalStorageSetting(SETTINGS.AUTOMATIC_DARK_MODE_ENABLED, false),
    autoplay: getLocalStorageSetting(SETTINGS.AUTOPLAY, false),
    resultCount: Number(getLocalStorageSetting(SETTINGS.RESULT_COUNT, 50)),
  },
  isNight: false,
  languages: {},
  daemonSettings: {},
};

reducers[ACTIONS.DAEMON_SETTINGS_RECEIVED] = (state, action) =>
  Object.assign({}, state, {
    daemonSettings: action.data.settings,
  });

reducers[ACTIONS.CLIENT_SETTING_CHANGED] = (state, action) => {
  const { key, value } = action.data;
  const clientSettings = Object.assign({}, state.clientSettings);

  clientSettings[key] = value;

  // this technically probably shouldn't happen here, and should be fixed when we're no longer using localStorage at all for persistent app state
  localStorage.setItem(`setting_${key}`, JSON.stringify(value));

  return Object.assign({}, state, {
    clientSettings,
  });
};

reducers[ACTIONS.UPDATE_IS_NIGHT] = (state, action) =>
  Object.assign({}, state, {
    isNight: action.data.isNight,
  });

reducers[ACTIONS.DOWNLOAD_LANGUAGE_SUCCEEDED] = (state, action) => {
  const languages = Object.assign({}, state.languages);
  const { language } = action.data;

  const langCode = language.substring(0, 2);

  if (LANGUAGES[langCode]) {
    languages[language] = `${LANGUAGES[langCode][0]} (${LANGUAGES[langCode][1]})`;
  } else {
    languages[langCode] = langCode;
  }

  return Object.assign({}, state, { languages });
};

reducers[ACTIONS.DOWNLOAD_LANGUAGE_FAILED] = (state, action) => {
  const languages = Object.assign({}, state.languages);
  delete languages[action.data.language];
  return Object.assign({}, state, { languages });
};

export default function reducer(state = defaultState, action) {
  const handler = reducers[action.type];
  if (handler) return handler(state, action);
  return state;
}