package com.handset.serialportsensor.utils;

import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;
import android.os.Build;
import android.os.Environment;
import android.os.Looper;
import android.text.TextUtils;
import android.util.Log;
import android.widget.Toast;

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

/**
 * UncaughtException处理类,当程序发生Uncaught异常的时候,有该类来接管程序,并记录发送错误报告.
 *
 * @author Jeremy
 */
public class CrashHandler implements UncaughtExceptionHandler {
    public static final String TAG = "HANDSET-JE002-EX";
    private static final String BROADCAST_ACTION = "com.ss.permission.crash_log_update";
    //private LocalBroadcastManager mLocalBroadcastManager;

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

    //程序的Context对象
    private Context 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("yyyy_MM_dd_HH_mm_ss", Locale.CHINA);

    private String packageName = "";

    private static class CrashHandlerHolder {
        private static CrashHandler instance = new CrashHandler();
    }

    /**
     * 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 CrashHandlerHolder.instance;
    }

    private String getCrashLogPath() {
        return getSavePath();
    }

    private static String getSavePath() {
        return Environment.getExternalStorageDirectory().getAbsolutePath()
                + File.separator + "htjc" + File.separator + "sensor" + File.separator + "crashlog/";
    }

    /**
     * 初始化
     * use init(Context context)  instead
     *
     * @param context context
     */
    @Deprecated
    public void init(Context context, String com, String pkgId) {
        mContext = context;
        //获取系统默认的UncaughtException处理器
        mDefaultHandler = Thread.getDefaultUncaughtExceptionHandler();
        //mLocalBroadcastManager = LocalBroadcastManager.getInstance(mContext);
        //设置该CrashHandler为程序的默认处理器
        Thread.setDefaultUncaughtExceptionHandler(this);
        if (!TextUtils.isEmpty(pkgId)) {
            this.packageName = pkgId;
        }
    }

    public void init(Context context) {
        mContext = context;
        //获取系统默认的UncaughtException处理器
        mDefaultHandler = Thread.getDefaultUncaughtExceptionHandler();
        //mLocalBroadcastManager = LocalBroadcastManager.getInstance(mContext);
        //设置该CrashHandler为程序的默认处理器
        Thread.setDefaultUncaughtExceptionHandler(this);
        String pkgId = context.getPackageName().replace(".", "_") + "_";
        if (!TextUtils.isEmpty(pkgId)) {
            this.packageName = pkgId;
        }

    }

    /**
     * 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
            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 异常
     * @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;
        }
        //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,即将退出.", Toast.LENGTH_LONG).show();
                Looper.loop();
            }
        }.start();
        //收集设备参数信息
        collectDeviceInfo(mContext);

        //打印异常log,以供分析调试
        ex.printStackTrace();
        //保存日志文件
        String path = saveCrashInfo2File(ex);

        Log.d(TAG, BROADCAST_ACTION);
        Intent intent = new Intent();
        intent.setAction(BROADCAST_ACTION);
        intent.putExtra("path", path);
        intent.putExtra("pkgName", mContext.getPackageName());
        mContext.sendBroadcast(intent);

        return true;
    }

    /**
     * 收集设备参数信息
     *
     * @param ctx 异常
     */
    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;
                String versionCode = pi.versionCode + "";
                infos.put("versionName", versionName);
                infos.put("versionCode", versionCode);
            }
        } catch (NameNotFoundException e) {
            Log.e(TAG, "An error occur 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 occur when collect crash info", e);
            }
        }
    }

    /**
     * 保存错误信息到文件中
     *
     * @param ex 异常
     * @return 返回文件名称, 便于将文件传送到服务器
     */
    private String saveCrashInfo2File(Throwable ex) {
        StringBuilder sb = new StringBuilder();
        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.close();
        String result = writer.toString();
        sb.append(result);
        try {
            long timestamp = System.currentTimeMillis();
            String time = formatter.format(new Date());
            String pkgNamePath = packageName.replace(".", "_");
            String fileName = "crash_" + pkgNamePath + "_" + time + "_" + timestamp + ".log";
            String path = getCrashLogPath();
            if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
                File dir = new File(path);
                if (!dir.exists()) {
                    boolean res = dir.mkdirs();
                    Log.v(TAG, ("saveCrashInfo2File res: " + res));
                }
                FileOutputStream fos = new FileOutputStream(path + fileName);
                fos.write(sb.toString().getBytes());
                fos.close();
            }
            return path + fileName;
        } catch (Exception e) {
            Log.e(TAG, "an error occur while writing file...", e);
        }
        return null;
    }
}