/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
'use strict';

import EventListenerManager from '/extlib/EventListenerManager.js';

import {
  configs,
  obsoleteConfigs,
} from '/common/common.js';
import * as Constants from '/common/constants.js';

export const onChanged = new EventListenerManager();

if (Constants.IS_BACKGROUND) {
  for (const [name, value] of Object.entries(configs.$default)) {
    if (obsoleteConfigs.has(name))
      continue;
    switch (typeof value) {
      case 'boolean':
        browser.prefs.setDefaultBoolValue(name, value);
        break;

      case 'string':
        browser.prefs.setDefaultStringValue(name, value);
        break;

      default:
        browser.prefs.setDefaultStringValue(name, JSON.stringify(value));
        break;
    }

    getPref(name).then(value => {
      if (JSON.stringify(configs[name]) == JSON.stringify(value))
        return;
      configs[name] = value;
    });
  }
}

async function getPref(name) {
  const defaultValue = configs.$default[name];
  switch (typeof defaultValue) {
    case 'boolean':
      return browser.prefs.getBoolValue(name, defaultValue);

    case 'string':
      return browser.prefs.getStringValue(name, defaultValue);

    default:
      return browser.prefs.getStringValue(name, JSON.stringify(defaultValue)).then(value => JSON.parse(value));
  }
}

const mNamesSyncToChrome = new Set();
const mNamesSyncFromChrome = new Set();

browser.prefs.onChanged.addListener(name => {
  if (mNamesSyncToChrome.has(name) ||
      mNamesSyncFromChrome.has(name))
    return;

  mNamesSyncFromChrome.add(name);
  getPref(name)
    .then(value => {
      configs[name] = value;
      window.requestAnimationFrame(() => {
        mNamesSyncFromChrome.delete(name);
      });
    });
});

configs.$addObserver(async name => {
  if (mNamesSyncToChrome.has(name) ||
      mNamesSyncFromChrome.has(name))
    return;

  mNamesSyncToChrome.add(name);

  const value = configs[name];
  const defaultValue = configs.$default[name];
  switch (typeof defaultValue) {
    case 'boolean':
      await browser.prefs.setBoolValue(name, value);
      break;

    case 'string':
      await browser.prefs.setStringValue(name, value);
      break;

    default:
      await browser.prefs.setStringValue(name, JSON.stringify(value));
      break;
  }

  window.requestAnimationFrame(() => {
    mNamesSyncToChrome.delete(name);
  });
});