import AsyncStorage from '@react-native-async-storage/async-storage';

/**
 * 本地存储 key 统一管理，避免 UI 里散落硬编码
 */
const KEY_ONBOARDING_COMPLETED = 'onboarding.completed';
const KEY_PUSH_PROMPT_STATE = 'push.promptState';
const KEY_CONTENT_REACTIONS = 'content.reactions';
const KEY_FAVORITES_ITEMS = 'favorites.items';
const KEY_CONSENT_ACCEPTED = 'consent.accepted';
const KEY_USER_PROFILE = 'user.profile';
const KEY_UI_THEME_MODE = 'ui.theme.mode';
const KEY_DAILY_REMINDER_SETTINGS = 'dailyReminder.settings';

export type PushPromptState = 'enabled' | 'skipped' | 'unknown';
export type Reaction = 'like' | 'dislike';
export type ReactionsMap = Record<string, Reaction>;
export type ThemeMode = 'scenery' | 'color';
export type UserProfile = {
  name?: string;
  intents?: string[];
};
export type DailyReminderSettings = {
  timesPerDay: number;
  pushEnabled: boolean;
};


async function getJson<T>(key: string, fallback: T): Promise<T> {
  const raw = await AsyncStorage.getItem(key);
  if (!raw) return fallback;
  try {
    return JSON.parse(raw) as T;
  } catch {
    return fallback;
  }
}

async function setJson<T>(key: string, value: T): Promise<void> {
  await AsyncStorage.setItem(key, JSON.stringify(value));
}

export async function getOnboardingCompleted(): Promise<boolean> {
  const raw = await AsyncStorage.getItem(KEY_ONBOARDING_COMPLETED);
  return raw === 'true';
}

export async function setOnboardingCompleted(completed: boolean): Promise<void> {
  await AsyncStorage.setItem(KEY_ONBOARDING_COMPLETED, completed ? 'true' : 'false');
}

export async function getPushPromptState(): Promise<PushPromptState> {
  const raw = await AsyncStorage.getItem(KEY_PUSH_PROMPT_STATE);
  if (raw === 'enabled' || raw === 'skipped' || raw === 'unknown') return raw;
  return 'unknown';
}

export async function setPushPromptState(state: PushPromptState): Promise<void> {
  await AsyncStorage.setItem(KEY_PUSH_PROMPT_STATE, state);
}

export async function getReactions(): Promise<ReactionsMap> {
  return await getJson<ReactionsMap>(KEY_CONTENT_REACTIONS, {});
}

export async function setReaction(contentId: string, reaction: Reaction): Promise<void> {
  const next = await getReactions();
  next[contentId] = reaction;
  await setJson(KEY_CONTENT_REACTIONS, next);
}

export type FavoriteItem = {
  id: string;
  date: string;
  themeMode: ThemeMode;
  background: string; // 颜色值或图片路径
};

export async function getFavorites(): Promise<FavoriteItem[]> {
  return await getJson<FavoriteItem[]>(KEY_FAVORITES_ITEMS, []);
}

export async function addFavorite(item: FavoriteItem): Promise<void> {
  const list = await getFavorites();
  if (list.some(i => i.id === item.id)) return;
  const newList = [item, ...list];
  console.log('Adding to favorites, new list size:', newList.length);
  await setJson(KEY_FAVORITES_ITEMS, newList);
}

export async function removeFavorite(contentId: string): Promise<void> {
  const list = await getFavorites();
  const next = list.filter(item => item.id !== contentId);
  await setJson(KEY_FAVORITES_ITEMS, next);
}

export async function getConsentAccepted(): Promise<boolean> {
  const raw = await AsyncStorage.getItem(KEY_CONSENT_ACCEPTED);
  return raw === 'true';
}

export async function setConsentAccepted(accepted: boolean): Promise<void> {
  await AsyncStorage.setItem(KEY_CONSENT_ACCEPTED, accepted ? 'true' : 'false');
}

export async function getThemeMode(): Promise<ThemeMode> {
  const raw = await AsyncStorage.getItem(KEY_UI_THEME_MODE);
  if (raw === 'scenery' || raw === 'color') return raw;
  return 'scenery';
}

export async function setThemeMode(mode: ThemeMode): Promise<void> {
  await AsyncStorage.setItem(KEY_UI_THEME_MODE, mode);
}

export async function getUserProfile(): Promise<UserProfile> {
  return await getJson<UserProfile>(KEY_USER_PROFILE, {});
}

export async function setUserProfile(profile: UserProfile): Promise<void> {
  const current = await getUserProfile();
  await setJson(KEY_USER_PROFILE, { ...current, ...profile });
}

export async function getDailyReminderSettings(): Promise<DailyReminderSettings> {
  const s = await getJson<DailyReminderSettings>(KEY_DAILY_REMINDER_SETTINGS, {
    timesPerDay: 3,
    pushEnabled: false,
  });
  const timesPerDay = Number.isFinite(s.timesPerDay) ? s.timesPerDay : 3;
  return {
    timesPerDay: Math.min(10, Math.max(1, Math.round(timesPerDay))),
    pushEnabled: Boolean(s.pushEnabled),
  };
}

export async function setDailyReminderSettings(settings: DailyReminderSettings): Promise<void> {
  const timesPerDay = Math.min(10, Math.max(1, Math.round(settings.timesPerDay)));
  await setJson(KEY_DAILY_REMINDER_SETTINGS, {
    timesPerDay,
    pushEnabled: Boolean(settings.pushEnabled),
  });
}