package com.dahe.mylibrary.utils;

import android.annotation.SuppressLint;
import android.content.Context;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.os.Build;
import android.os.Environment;
import android.os.Looper;
import android.os.SystemClock;
import android.util.Log;
import android.widget.Toast;

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

import static android.os.Environment.DIRECTORY_ALARMS;

/**

• 全局捕获异常

• 
  
• 当程序发生Uncaught异常的时候,有该类来接管程序,并记录错误日志

*
*/
@SuppressLint("SimpleDateFormat")
public class CrashHandler implements Thread.UncaughtExceptionHandler {

public static String TAG = "MyCrash";
// 系统默认的UncaughtException处理类
private Thread.UncaughtExceptionHandler mDefaultHandler;

private static CrashHandler instance = new CrashHandler();
private Context mContext;

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

// 用于格式化日期,作为日志文件名的一部分
private DateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

/** 保证只有一个CrashHandler实例 */
private CrashHandler() {
}

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

/**
 * 初始化
 *
 * @param context
 */
public void init(Context 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);
    FileUtil.removeFileByTime(getGlobalpath());

// autoClear(5);

}

/**
 * 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 {
        SystemClock.sleep(3000);
        // 退出程序
        android.os.Process.killProcess(android.os.Process.myPid());
        System.exit(1);
    }
}

/**
 * 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
 * @return true:如果处理了该异常信息; 否则返回false.
 */
private boolean handleException(Throwable ex) {
    if (ex == null)
        return false;
    try {
        // 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,即将重启.",
                        Toast.LENGTH_LONG).show();
                Looper.loop();
            }
        }.start();
        // 收集设备参数信息
        collectDeviceInfo(mContext);
        // 保存日志文件
        saveCrashInfoFile(ex);
        SystemClock.sleep(3000);
    } catch (Exception e) {
        e.printStackTrace();
    }

    return true;
}

/**
 * 收集设备参数信息
 *
 * @param ctx
 */
public 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 + "";
            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());
        } catch (Exception e) {
            Log.e(TAG, "an error occured when collect crash info", e);
        }
    }
}

/**
 * 保存错误信息到文件中
 * @param ex
 * @return 返回文件名称,便于将文件传送到服务器
 * @throws Exception
 */
private String saveCrashInfoFile(Throwable ex) throws Exception {
    StringBuffer sb = new StringBuffer();
    try {
        SimpleDateFormat sDateFormat = new SimpleDateFormat(
                "yyyy-MM-dd HH:mm:ss");
        String date = sDateFormat.format(new java.util.Date());
        sb.append("\r\n" + date + "\n");
        for (Map.Entry<String, String> entry : infos.entrySet()) {
            String key = entry.getKey();
            String value = entry.getValue();
            sb.append(key + "=" + value + "\n");
        }

        Writer writer = new StringWriter();
        PrintWriter printWriter = new PrintWriter(writer);
        ex.printStackTrace(printWriter);
        Throwable cause = ex.getCause();
        while (cause != null) {
            cause.printStackTrace(printWriter);
            cause = cause.getCause();
        }
        printWriter.flush();
        printWriter.close();
        String result = writer.toString();
        sb.append(result);

        String fileName = writeFile(sb.toString());
        return fileName;
    } catch (Exception e) {
        Log.e(TAG, "an error occured while writing file...", e);
        sb.append("an error occured while writing file...\r\n");
        writeFile(sb.toString());
    }
    return null;
}

private String writeFile(String sb) throws Exception {
    String time = formatter.format(new Date());
    String fileName = "crash-" + time + ".log";

// if (FileUtil.hasSdcard()) {

        String path = getGlobalpath();
        File dir = new File(path);
        if (!dir.exists())
            dir.mkdirs();

        String filePath = path + fileName;
        File txtFile = new File(filePath);
        if (!txtFile.exists())
            txtFile.createNewFile();

        FileOutputStream fos = new FileOutputStream(txtFile, true);
        fos.write(sb.getBytes());
        fos.flush();
        fos.close();

// }

    return fileName;
}

public static String getGlobalpath() {
    return Environment.getExternalStorageDirectory().getAbsolutePath()
            + File.separator + "crash" + File.separator;
}

public static void setTag(String tag) {
    TAG = tag;
}

}