(function () {
  "use strict";

  const DEFAULTS = {
    enabled: true,
    darkMode: "auto",
    "light.subredditBgColor": "#fde8e0",
    "light.subredditBorderColor": "#c84a20",
    "light.subredditTextColor": "#c84a20",
    "light.commentsBgColor": "#e0e0e0",
    "light.commentsBorderColor": "#4a4a4a",
    "light.commentsTextColor": "#4a4a4a",
    "dark.subredditBgColor": "#3d2518",
    "dark.subredditBorderColor": "#ff6b3d",
    "dark.subredditTextColor": "#ff6b3d",
    "dark.commentsBgColor": "#3a3a3a",
    "dark.commentsBorderColor": "#888888",
    "dark.commentsTextColor": "#cccccc",
    subredditColors: {},
  };

  function migrateSubredditColors(colors) {
    let migrated = false;
    const result = {};
    for (const name of Object.keys(colors)) {
      const entry = colors[name];
      if (entry && entry.bg !== undefined && !entry.light && !entry.dark) {
        result[name] = { light: { bg: entry.bg, border: entry.border, text: entry.text }, dark: { bg: entry.bg, border: entry.border, text: entry.text } };
        migrated = true;
      } else {
        result[name] = entry;
      }
    }
    return { result: result, migrated: migrated };
  }

  async function loadSettings() {
    const stored = await browser.storage.local.get(null);
    const merged = Object.assign({}, DEFAULTS, stored);
    const migration = migrateSubredditColors(merged.subredditColors || {});
    merged.subredditColors = migration.result;
    if (migration.migrated) {
      await browser.storage.local.set({ subredditColors: merged.subredditColors });
    }
    return merged;
  }

  async function saveSettings(settings) {
    const toStore = {};
    for (const key of Object.keys(settings)) {
      if (key in DEFAULTS) {
        toStore[key] = settings[key];
      }
    }
    await browser.storage.local.set(toStore);
  }

  async function resetSettings() {
    await browser.storage.local.clear();
  }

  window.RedditTweaks = window.RedditTweaks || {};
  window.RedditTweaks.DEFAULTS = DEFAULTS;
  window.RedditTweaks.loadSettings = loadSettings;
  window.RedditTweaks.saveSettings = saveSettings;
  window.RedditTweaks.resetSettings = resetSettings;
})();