package com.fz.myapplication.utils;

import android.content.Context;
import android.content.SharedPreferences;
import android.os.AsyncTask;
import android.util.Log;

import java.lang.ref.SoftReference;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.concurrent.ConcurrentMap;

/**

• SharePreference工具类，包含基于ConcurrentMap缓存功能

• ConcurrentMap，它是一个接口，是一个能够支持并发访问的java.util.map集合；

• 在原有java.util.map接口基础上又新提供了4种方法，进一步扩展了原有Map的功能：
  */
  public class SpCache {
  private static final String TAG = SpCache.class.getSimpleName();
  private static SpCache INSTANCE;
  private ConcurrentMap<String, SoftReference<Object>> mCache;
  private String mPrefFileName = "com.fz.spcache";
  private Context mContext;

  /**

  • 构造方法
    */
    public SpCache(Context mContext) {
    this.mContext = mContext.getApplicationContext();
    }

/**
 * 单例（双重检查）初始化
 */
public static SpCache init(Context context){
    if(INSTANCE==null){
        synchronized (SpCache.class){
            if (INSTANCE==null){
                INSTANCE = new SpCache(context);
            }
        }
    }
    return INSTANCE;
}


/**
 * 获取单例
 */
private static SpCache getInstance()
{
    if (INSTANCE == null)
        throw new NullPointerException("you show invoke SpCache.init() before you use it ");
    return INSTANCE;
}

private SharedPreferences getSharedPreferences()
{
    return mContext.getSharedPreferences(mPrefFileName, Context.MODE_PRIVATE);
}


/***
 *   ============================================================contains，remove，clear=================================================================================
 */

//contains
public boolean contains(String key)
{
    return mCache.get(key).get() != null ? true : getSharedPreferences().contains(key);
}

//remove
public static SpCache remove(String key)
{
    return INSTANCE._remove(key);
}

private SpCache _remove(String key)
{
    mCache.remove(key);
    SharedPreferences.Editor editor = getSharedPreferences().edit();
    editor.remove(key);
    SharedPreferencesCompat.apply(editor);
    return INSTANCE;
}

//clear
public static SpCache clear()
{
    return INSTANCE._clear();
}

/**
 * 清除缓存
 */
private SpCache _clear()
{
    mCache.clear();
    SharedPreferences.Editor editor = getSharedPreferences().edit();
    editor.clear();
    SharedPreferencesCompat.apply(editor);
    return INSTANCE;
}




/***
 *   ============================================================get,put通用抽取=================================================================================
 */
private Object readDisk(String key,Object defaultObject){
    SharedPreferences sp = getSharedPreferences();
    if(defaultObject instanceof String){
        return sp.getString(key, (String) defaultObject);
    }else if(defaultObject instanceof Float){
        return sp.getFloat(key, (Float) defaultObject);
    }else if(defaultObject instanceof Boolean){
        return sp.getBoolean(key, (Boolean) defaultObject);
    }else if(defaultObject instanceof Integer){
        return sp.getInt(key, (Integer) defaultObject);
    }else if(defaultObject instanceof Long){
        return sp.getLong(key, (Long) defaultObject);
    }
    Log.e(TAG, "you can not read object , which class is " + defaultObject.getClass().getSimpleName());
    return null;
}


private <T> SpCache put(String key, T t)
{
    mCache.put(key, new SoftReference<Object>(t));
    SharedPreferences.Editor editor = getSharedPreferences().edit();
    if (t instanceof String)
    {
        editor.putString(key, (String) t);
    } else if (t instanceof Integer)
    {
        editor.putInt(key, (Integer) t);
    } else if (t instanceof Boolean)
    {
        editor.putBoolean(key, (Boolean) t);
    } else if (t instanceof Float)
    {
        editor.putFloat(key, (Float) t);
    } else if (t instanceof Long)
    {
        editor.putLong(key, (Long) t);
    } else
    {
        Log.d(TAG, "you may be put a invalid object :" + t);
        editor.putString(key, t.toString());
    }

    SharedPreferencesCompat.apply(editor);
    return INSTANCE;
}

private Object get(String key, Object defval)
{   //缓存
    SoftReference reference = mCache.get(key);
    Object val = null;
    //缓存为空从SP读取，并存入缓存
    if(null == reference || null == reference.get()){
         val = readDisk(key,defval);
        mCache.put(key, new SoftReference<Object>(val));
    }
    //缓存不为空直接取
    val = mCache.get(key).get();
    return val;
}

/***
 *   ============================================================反射调用=================================================================================
 */


/**
 * 创建一个解决SharedPreferencesCompat.apply方法的一个兼容类
 *
 * @author zhy
 */
private static class SharedPreferencesCompat
{
    private static final Method sApplyMethod = findApplyMethod();

    /**
     * 反射查找apply的方法
     *
     * @return
     */
    @SuppressWarnings({"unchecked", "rawtypes"})
    private static Method findApplyMethod()
    {
        try
        {
            Class clz = SharedPreferences.Editor.class;
            return clz.getMethod("apply");
        } catch (NoSuchMethodException e)
        {
        }

        return null;
    }

    /**
     * 如果找到则使用apply执行，否则使用commit
     *
     * @param editor
     */
    public static void apply(final SharedPreferences.Editor editor)
    {
        try
        {
            if (sApplyMethod != null)
            {
                sApplyMethod.invoke(editor);
                Log.d(TAG, "============apply");
                return;
            }
        } catch (IllegalArgumentException e)
        {
        } catch (IllegalAccessException e)
        {
        } catch (InvocationTargetException e)
        {
        }

        new AsyncTask<Void, Void, Void>()
        {

            @Override
            protected Void doInBackground(Void... params)
            {
                editor.commit();
                Log.d(TAG, "============commit");
                return null;
            }
        }.execute();
    }
}

/***

• ============================================================调用方法区=================================================================================
  */

/***

• get**调用
  */

//get
public static int getInt(String key, int defaultVal)
{
    return (int) (getInstance().get(key, defaultVal));
}

public static long getLong(String key, long defaultVal)
{
    return (long) (getInstance().get(key, defaultVal));
}

public static String getString(String key, String defaultVal)
{
    return (String) (getInstance().get(key, defaultVal));
}

public static boolean getBoolean(String key, boolean defaultVal)
{
    return (boolean) (getInstance().get(key, Boolean.class));
}

public static float getFloat(String key, float defaultVal)
{
    return (float) (getInstance().get(key, defaultVal));
}


/***
 *    put**调用
 */
//put

public static SpCache putInt(String key, int val)
{
    return getInstance().put(key, val);
}

public static SpCache putLong(String key, long val)
{
    return getInstance().put(key, val);
}

public static SpCache putString(String key, String val)
{
    return getInstance().put(key, val);
}

public static SpCache putBoolean(String key, boolean val)
{
    return getInstance().put(key, val);
}

public static SpCache putFloat(String key, float val)
{
    return getInstance().put(key, val);
}

}