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

// 用户偏好设置的存储键
const PREFERENCES_KEYS = {
  QUICK_WATER_AMOUNT: 'user_preference_quick_water_amount',
  NOTIFICATION_ENABLED: 'user_preference_notification_enabled',
} as const;

// 用户偏好设置接口
export interface UserPreferences {
  quickWaterAmount: number;
  notificationEnabled: boolean;
}

// 默认的用户偏好设置
const DEFAULT_PREFERENCES: UserPreferences = {
  quickWaterAmount: 150, // 默认快速添加饮水量为 150ml
  notificationEnabled: true, // 默认开启消息推送
};

/**
 * 获取用户偏好设置
 */
export const getUserPreferences = async (): Promise<UserPreferences> => {
  try {
    const quickWaterAmount = await AsyncStorage.getItem(PREFERENCES_KEYS.QUICK_WATER_AMOUNT);
    const notificationEnabled = await AsyncStorage.getItem(PREFERENCES_KEYS.NOTIFICATION_ENABLED);

    return {
      quickWaterAmount: quickWaterAmount ? parseInt(quickWaterAmount, 10) : DEFAULT_PREFERENCES.quickWaterAmount,
      notificationEnabled: notificationEnabled !== null ? notificationEnabled === 'true' : DEFAULT_PREFERENCES.notificationEnabled,
    };
  } catch (error) {
    console.error('获取用户偏好设置失败:', error);
    return DEFAULT_PREFERENCES;
  }
};

/**
 * 设置快速添加饮水的默认值
 * @param amount 饮水量（毫升）
 */
export const setQuickWaterAmount = async (amount: number): Promise<void> => {
  try {
    // 确保值在合理范围内（50ml - 1000ml）
    const validAmount = Math.max(50, Math.min(1000, amount));
    await AsyncStorage.setItem(PREFERENCES_KEYS.QUICK_WATER_AMOUNT, validAmount.toString());
  } catch (error) {
    console.error('设置快速添加饮水默认值失败:', error);
    throw error;
  }
};

/**
 * 获取快速添加饮水的默认值
 */
export const getQuickWaterAmount = async (): Promise<number> => {
  try {
    const amount = await AsyncStorage.getItem(PREFERENCES_KEYS.QUICK_WATER_AMOUNT);
    return amount ? parseInt(amount, 10) : DEFAULT_PREFERENCES.quickWaterAmount;
  } catch (error) {
    console.error('获取快速添加饮水默认值失败:', error);
    return DEFAULT_PREFERENCES.quickWaterAmount;
  }
};

/**
 * 设置消息推送开关
 * @param enabled 是否开启消息推送
 */
export const setNotificationEnabled = async (enabled: boolean): Promise<void> => {
  try {
    await AsyncStorage.setItem(PREFERENCES_KEYS.NOTIFICATION_ENABLED, enabled.toString());
  } catch (error) {
    console.error('设置消息推送开关失败:', error);
    throw error;
  }
};

/**
 * 获取消息推送开关状态
 */
export const getNotificationEnabled = async (): Promise<boolean> => {
  try {
    const enabled = await AsyncStorage.getItem(PREFERENCES_KEYS.NOTIFICATION_ENABLED);
    return enabled !== null ? enabled === 'true' : DEFAULT_PREFERENCES.notificationEnabled;
  } catch (error) {
    console.error('获取消息推送开关状态失败:', error);
    return DEFAULT_PREFERENCES.notificationEnabled;
  }
};

/**
 * 重置所有用户偏好设置为默认值
 */
export const resetUserPreferences = async (): Promise<void> => {
  try {
    await AsyncStorage.removeItem(PREFERENCES_KEYS.QUICK_WATER_AMOUNT);
    await AsyncStorage.removeItem(PREFERENCES_KEYS.NOTIFICATION_ENABLED);
  } catch (error) {
    console.error('重置用户偏好设置失败:', error);
    throw error;
  }
};