package com.ewei.demo;

import android.app.AlarmManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.os.Build;
import android.os.Environment;
import android.os.Looper;
import android.util.Log;
import android.widget.Toast;

import com.ewei.sdk.base.EweiSetting;

import java.io.File;
import java.io.FileOutputStream;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.lang.reflect.Field;
import java.net.UnknownHostException;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;


/**
 * 异常转储类 mh
 * Created by Administrator on 2016/6/30.
 */
public class CrashHandler implements Thread.UncaughtExceptionHandler {

    public static final String TAG = CrashHandler.class.getCanonicalName();

    //系统默认的UncaughtException处理类
    private Thread.UncaughtExceptionHandler mDefaultHandler;

    //CrashHandler实例
    private static CrashHandler INSTANCE = new CrashHandler();

    //程序的Context对象
    private EweiSdkApplication mContext;

    //用来存储设备信息和异常信息
    private Map<String, String> infos = new HashMap<>();

    //用于格式化日期,作为日志文件名的一部分
    private DateFormat formatter = new SimpleDateFormat("yyyyMMdd_HHmmss");


    private CrashHandler() {

    }

    //获取实例 ，单例模式
    public static CrashHandler getInstance() {
        return INSTANCE;
    }

    //初始化
    public void init(EweiSdkApplication context) {
        mContext = context;
        // 获取系统默认的UncaughtException处理器
        mDefaultHandler = Thread.getDefaultUncaughtExceptionHandler();
        // 设置该CrashHandler为程序的默认处理器
        Thread.setDefaultUncaughtExceptionHandler(this);
    }

    //当UncaughtException发生时会转入该函数来处理
    @Override
    public void uncaughtException(Thread thread, Throwable ex) {
        if (!handleException(ex) && mDefaultHandler != null) {
            // 如果用户没有处理则让系统默认的异常处理器来处理
            mDefaultHandler.uncaughtException(thread, ex);
        } else {
            try {
                Thread.sleep(3000);
            } catch (InterruptedException e) {
                Log.e(TAG, "error : ", e);
            }
        }

        // 退出程序
        Intent intent = new Intent(mContext.getApplicationContext(), IndexActivity.class);
        PendingIntent restartIntent = PendingIntent.getActivity(mContext, 0, intent, Intent.FLAG_ACTIVITY_NEW_TASK);
        // 退出程序
        AlarmManager mgr = (AlarmManager) mContext.getSystemService(Context.ALARM_SERVICE);
        // 1秒钟后重启应用
        mgr.set(AlarmManager.RTC, System.currentTimeMillis() + 1000, restartIntent);
    }

    /**
     * 自定义错误处理,收集错误信息 发送错误报告等操作均在此完成
     *
     * @param ex 异常信息
     * @return 是否处理成功
     */
    private boolean handleException(Throwable ex) {
        if (ex == null) {
            return false;
        }

        // 使用Toast来显示异常信息
        new Thread() {
            @Override
            public void run() {
                Looper.prepare();
                Toast.makeText(mContext, "很抱歉，程序出现异常。", Toast.LENGTH_LONG).show();
                Looper.loop();
            }
        }.start();

        // 收集设备参数信息
        collectDeviceInfo(mContext);

        // 保存日志文件
        String str = saveCrashInfo2File(ex);
        Log.e(TAG, str);

        return true;
    }

    /**
     * 收集设备参数信息
     *
     * @param ctx
     */
    private void collectDeviceInfo(Context ctx) {
        try {
            PackageManager pm = ctx.getPackageManager();
            PackageInfo pi = pm.getPackageInfo(ctx.getPackageName(), PackageManager.GET_ACTIVITIES);
            if (pi != null) {
                String versionName = pi.versionName == null ? "null" : pi.versionName + EweiSetting.getVersionName();
                String versionCode = pi.versionCode + "";
                infos.put("versionName", versionName);
                infos.put("versionCode", versionCode);
            }
        } catch (PackageManager.NameNotFoundException e) {
            Log.e(TAG, "an error occured when collect package info", e);
        }

        Field[] fields = Build.class.getDeclaredFields();
        for (Field field : fields) {
            try {
                field.setAccessible(true);
                infos.put(field.getName(), field.get(null).toString());
                Log.d(TAG, field.getName() + " : " + field.get(null));
            } catch (Exception e) {
                Log.e(TAG, "an error occured when collect crash info", e);
            }
        }
    }

    /**
     * 保存错误信息到文件中。返回文件名称,便于将文件传送到服务器
     *
     * @param ex
     * @return
     */
    private String saveCrashInfo2File(Throwable ex) {
        StringBuffer sb = new StringBuffer();
        for (Map.Entry<String, String> entry : infos.entrySet()) {
            String key = entry.getKey();
            String value = entry.getValue();
            sb.append("[" + key + ", " + value + "]\n");
        }

        sb.append("\n" + getStackTraceString(ex));

        try {
            String time = formatter.format(new Date());
            String fileName = "CRS_" + time + ".text";

            File sdDir = null;

            if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
                sdDir = Environment.getExternalStorageDirectory();
            }

            File cacheDir = new File(sdDir + File.separator + "dPhoneLogEweiSdk");
            if (!cacheDir.exists()) {
                cacheDir.mkdir();
            }

            File filePath = new File(cacheDir + File.separator + fileName);

            FileOutputStream fos = new FileOutputStream(filePath);
            fos.write(sb.toString().getBytes());
            fos.close();

            return fileName;

        } catch (Exception e) {
            Log.e(TAG, "an error occured while writing file...", e);
        }

        return null;
    }


    /**
     * 获取捕捉到的异常的字符串
     *
     * @param tr
     * @return
     */
    private static String getStackTraceString(Throwable tr) {
        if (tr == null) {
            return "";
        }

        Throwable t = tr;
        while (t != null) {
            if (t instanceof UnknownHostException) {
                return "";
            }
            t = t.getCause();
        }

        StringWriter sw = new StringWriter();
        PrintWriter pw = new PrintWriter(sw);
        tr.printStackTrace(pw);
        return sw.toString();
    }
}
