package com.basic.security.utils.bitmap;

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.AsyncTask;
import android.widget.ImageView;

import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;

/**
 * 网络缓存
 *
 * @author Kevin
 */
public class NetCacheUtils {

    private LocalCacheUtils mLocalCacheUtils;
    private MemoryCacheUtils mMemoryCacheUtils;

    public NetCacheUtils(LocalCacheUtils localCacheUtils,
                         MemoryCacheUtils memoryCacheUtils) {
        mLocalCacheUtils = localCacheUtils;
        mMemoryCacheUtils = memoryCacheUtils;
    }

    /**
     * 从网络下载图片
     *
     * @param ivPic
     * @param url
     */
    public void getBitmapFromNet(ImageView ivPic, String url) {
        new BitmapTask().execute(ivPic, url);// 启动AsyncTask,
        // 参数会在doInbackground中获取
    }

    /**
     * 下载图片
     *
     * @param url
     * @return
     */
    private Bitmap downloadBitmap(String url) {

        HttpURLConnection conn = null;
        try {
            conn = (HttpURLConnection) new URL(url).openConnection();

            conn.setConnectTimeout(5000);
            conn.setReadTimeout(5000);
            conn.setRequestMethod("GET");
            conn.connect();

            int responseCode = conn.getResponseCode();
            if (responseCode == 200) {
                InputStream inputStream = conn.getInputStream();

                //图片压缩处理
                BitmapFactory.Options option = new BitmapFactory.Options();
                option.inSampleSize = 2;//宽高都压缩为原来的二分之一, 此参数需要根据图片要展示的大小来确定
                option.inPreferredConfig = Bitmap.Config.RGB_565;//设置图片格式

                Bitmap bitmap = BitmapFactory.decodeStream(inputStream, null, option);
                return bitmap;
            }

        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            conn.disconnect();
        }

        return null;
    }

    /**
     * Handler和线程池的封装
     * <p>
     * 第一个泛型: 参数类型 第二个泛型: 更新进度的泛型, 第三个泛型是onPostExecute的返回结果
     *
     * @author Kevin
     */
    class BitmapTask extends AsyncTask<Object, Void, Bitmap> {

        private ImageView ivPic;
        private String url;

        /**
         * 后台耗时方法在此执行, 子线程
         */
        @Override
        protected Bitmap doInBackground(Object... params) {
            ivPic = (ImageView) params[0];
            url = (String) params[1];

            ivPic.setTag(url);// 将url和imageview绑定

            return downloadBitmap(url);
        }

        /**
         * 更新进度, 主线程
         */
        @Override
        protected void onProgressUpdate(Void... values) {
            super.onProgressUpdate(values);
        }

        /**
         * 耗时方法结束后,执行该方法, 主线程
         */
        @Override
        protected void onPostExecute(Bitmap result) {
            if (result != null) {
                String bindUrl = (String) ivPic.getTag();

                if (url.equals(bindUrl)) {// 确保图片设定给了正确的imageview
                    ivPic.setImageBitmap(result);
                    mLocalCacheUtils.setBitmapToLocal(url, result);// 将图片保存在本地
                    mMemoryCacheUtils.setBitmapToMemory(url, result);// 将图片保存在内存
                }
            }
        }
    }

}