package com.example.taobaounion.utils;

import android.content.Context;
import android.content.SharedPreferences;

import com.example.taobaounion.base.BaseApplication;
import com.example.taobaounion.model.domain.CacheWithDuration;
import com.example.taobaounion.model.domain.Histories;
import com.google.gson.Gson;

public class JsonCacheUtil {
    public final static String JSON_CACHE_SP_NAME = "json_cache_sp_name";
    private final SharedPreferences mSharedPreferences;
    private final Gson mGson;

    private static JsonCacheUtil sJsonCacheUtil = null;

    public static JsonCacheUtil getInstance(){
        if (sJsonCacheUtil == null) {
            sJsonCacheUtil = new JsonCacheUtil();
        }
        return sJsonCacheUtil;
    }

    private JsonCacheUtil(){
        mSharedPreferences = BaseApplication.getAppContext()
                .getSharedPreferences(JSON_CACHE_SP_NAME, Context.MODE_PRIVATE);

        mGson = new Gson();

    }

    public void saveCache(String key,Object value){
        this.saveCache(key, value,-1L);

    }

    /**
     * 增加一个闪存内容
     * @param key
     * @param value
     * @param duration
     */
    public void saveCache(String key,Object value,long duration){
        SharedPreferences.Editor edit = mSharedPreferences.edit();
        //保存一个有数据有时间的内容
        String valueStr = mGson.toJson(value);
        if (duration != -1L){
            duration += System.currentTimeMillis();
        }
        CacheWithDuration cacheWithDuration = new CacheWithDuration(duration, valueStr);
        String cacheWithTime = mGson.toJson(cacheWithDuration);
        edit.putString(key,cacheWithTime);


        edit.apply();

    }


    /**
     * 删除一个闪存内容
     * @param key
     */
    public void delCache(String key){
        mSharedPreferences.edit().remove(key).apply();

    }
    public <T> T  getValue(String key, Class<T> clazz){
        String valueWithDuration = mSharedPreferences.getString(key, null);
        LogUtils.d(this,"valueWithDuration"+valueWithDuration);
        if (valueWithDuration == null) {
            return null;
        }
        CacheWithDuration cacheWithDuration = mGson.fromJson(valueWithDuration, CacheWithDuration.class);
        //对时间进行判断
        long duration = cacheWithDuration.getDuration();
        //判断是否过了期
        if (duration != -1 && duration-System.currentTimeMillis()<=0){
            //没过期
            return null;

        }else{
            //过期了
            LogUtils.d(this,"clazz--->"+clazz);
            LogUtils.d(this,"cacheWithDuration.getCache()-->"+cacheWithDuration.getCache());

            return mGson.fromJson(cacheWithDuration.getCache(),clazz);
        }


    }
}