import preferences from '@ohos.data.preferences';

class PreferencesUtil {
  prefMap: Map<string, preferences.Preferences> = new Map()

  async loadPreference(context, name: string) {
    try { //加载preferences
      const pref = await preferences.getPreferences(context, name)
      this.prefMap.set(name, pref)
      console.log('testTag', `加载Preference[${name}]成功`)
    } catch (e) {
      console.log('testTag', `加载Preference[${name}]失败`, JSON.stringify(e))
    }
  }

  async putPreferenceValue(name: string, key: string, value: preferences.ValueType) {
    if (!this.prefMap.has(name)) {
      console.log('testTag', `Preference[${name}]尚未初始化！`)
      return
    }
    try {
      const pref = this.prefMap.get(name)
      //写入数据
      await pref.put(key, value)
      //刷盘
      await pref.flush()
      console.log('testTag', `保存Preference[${name}.${key} = ${value}]成功！`)
    } catch (e) {
      console.log('testTag', `保存Preference[${name}.${key} = ${value}]失败！`, JSON.stringify(e))
    }
  }

  async getPreferenceValue(name: string, key: string, defaultValue: preferences.ValueType) {
    if (!this.prefMap.has(name)) {
      console.log('testTag', `Preference[${name}]尚未初始化！`)
      return
    }
    try {
      const pref = this.prefMap.get(name)
      //读取数据
      const value = await pref.get(key, defaultValue)
      console.log('testTag', `读取Preference[${name}.${key} = ${value}]成功！`)
      return value
    } catch (e) {
      console.log('testTag', `读取Preference[${name}.${key}]失败`, JSON.stringify(e))
    }
  }
}