package com.aoleyun.sn.utils;

import android.content.Context;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.net.TrafficStats;
import android.text.TextUtils;
import android.util.Log;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.util.List;

public class GetFlowUtil {
    public static FlowInfo getAppFlowInfo(String pakageName, Context context) {
        //获取到配置权限信息的应用程序
        PackageManager pms = context.getPackageManager();
        List<PackageInfo> packinfos = pms
                .getInstalledPackages(PackageManager.GET_PERMISSIONS);
        //存放具有Internet权限信息的应用
        FlowInfo flowInfo = new FlowInfo();
        for (PackageInfo packinfo : packinfos) {
            String appName = packinfo.packageName;
            if (!TextUtils.isEmpty(appName)) {
                if (appName.equals(pakageName)) {
                    //用于封装具有Internet权限的应用程序信息
                    //封装应用信息
                    flowInfo.setPackname(packinfo.packageName);
                    flowInfo.setIcon(packinfo.applicationInfo.loadIcon(pms));
                    flowInfo.setAppname(packinfo.applicationInfo.loadLabel(pms).toString());
                    //获取到应用的uid（user id）
                    int uid = packinfo.applicationInfo.uid;
                    //TrafficStats对象通过应用的uid来获取应用的下载、上传流量信息
                    //发送的 上传的流量byte
                    flowInfo.setUpKb(TrafficStats.getUidRxBytes(uid));
                    //下载的流量 byte
                    flowInfo.setDownKb(TrafficStats.getUidTxBytes(uid));
                    break;
                }
            }
        }
        return flowInfo;
    }

    private static long[] getStat(int uid) {
        String line, line2;
        long[] stats = new long[2];
        try {
            File fileSnd = new File("/proc/uid_stat/" + uid + "/tcp_snd");
            File fileRcv = new File("/proc/uid_stat/" + uid + "/tcp_rcv");
            BufferedReader br1 = new BufferedReader(new FileReader(fileSnd));
            BufferedReader br2 = new BufferedReader(new FileReader(fileRcv));
            while ((line = br1.readLine()) != null && (line2 = br2.readLine()) != null) {
                stats[0] = Long.parseLong(line);
                stats[1] = Long.parseLong(line2);
            }
            br1.close();
            br2.close();
        } catch (Exception e) {
            e.printStackTrace();
            Log.e("getStat: ", e.getMessage());
        }
        return stats;
    }

    //将字节数转化为MB
    public static String byteToMB(long size) {
        long kb = 1024;
        long mb = kb * 1024;
        long gb = mb * 1024;
        if (size >= gb) {
            return String.format("%.1f GB", (float) size / gb);
        } else if (size >= mb) {
            float f = (float) size / mb;
            return String.format(f > 100 ? "%.0f MB" : "%.1f MB", f);
        } else if (size > kb) {
            float f = (float) size / kb;
            return String.format(f > 100 ? "%.0f KB" : "%.1f KB", f);
        } else {
            return String.format("%d B", size);
        }
    }
}