package com.runt.open.mvi;

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

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
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;

/**
 * My father is Object, ites purpose of   崩溃监听
 *
 * @purpose Created by Runt (qingingrunt2010@qq.com) on 2021-4-13.
 */

public class CrashHandler implements Thread.UncaughtExceptionHandler {

    public static final String TAG = "CrashHandler";

    //系统默认的UncaughtException处理类
    private Thread.UncaughtExceptionHandler mDefaultHandler;
    //CrashHandler实例
    private static CrashHandler instance;
    CrashListener crashListener;
    //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<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() {
        Log.i(TAG, "getInstance");
        if(instance == null)
            instance = new CrashHandler();
        return instance;
    }

    /**
     * 初始化
     */
    public void init(Context context) {
        Log.i(TAG, "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);
    }

    public void init(Context context,CrashListener crashListener) {
        Log.i(TAG, "init context:"+context);
        mContext = context;
        this.crashListener = crashListener;
        //设置该CrashHandler为程序的默认处理器
        Thread.setDefaultUncaughtExceptionHandler(this);
    }

    public interface CrashListener {
        void onCrash();
    }
    /**
     * 当UncaughtException发生时会转入该函数来处理
     */
    @Override
    public void uncaughtException(Thread thread, Throwable ex) {
        //Log.i(TAG, "uncaughtException 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);
        }
        if (crashListener != null) {
            crashListener.onCrash();
        }
    }

    /**
     * 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) {
        //Log.i(TAG, "handleException Throwable:"+ex);
        if (ex == null) {
            return false;
        }
        //收集设备参数信息
        collectDeviceInfo(mContext);

        //保存日志文件
        saveCatchInfoFile(ex);
        return true;
    }

    /**
     * 收集设备参数信息
     * @param ctx
     */
    public void collectDeviceInfo(Context ctx) {
        Log.i(TAG, "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 (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
     *
     * @param ex
     * @return  返回文件名称,便于将文件传送到服务器
     */
    private String saveCatchInfoFile(Throwable ex) {
        //ex.printStackTrace();
        //Log.i(TAG, "saveCatchInfo2File 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");
        }

        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 fileName = "crash-" + time + "-" + timestamp + ".log";
            if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
                String path = mContext.getExternalFilesDir(null).getAbsolutePath()+"/crash/";
                File dir = new File(path);
                if (!dir.exists()) {
                    dir.mkdirs();
                }
                String newFileName = path + fileName;
                Log.i(TAG,"exc newFileName:"+newFileName);
                File file = new File(newFileName);
                file.mkdirs();
                if(file.exists()){
                    file.delete();
                }
                file.createNewFile();
                FileOutputStream fos = new FileOutputStream(file);
                fos.write(sb.toString().getBytes());
                //发送给开发人员
                sendCrashLog2PM(path+fileName);
                fos.close();
            }
            return fileName;
        } catch (Exception e) {
            Log.e(TAG, "an error occured while writing file...", e);
        }
        return null;
    }

    /**
     * 将捕获的导致崩溃的错误信息发送给开发人员
     *
     * 目前只将log日志保存在sdcard 和输出到LogCat中，并未发送给后台。
     */
    private void sendCrashLog2PM(String fileName){
        Log.i(TAG, "asendCrashLog2PM fileName:"+fileName);
        if(!new File(fileName).exists()){
            Toast.makeText(mContext, "日志文件不存在！", Toast.LENGTH_SHORT).show();
            return;
        }
        FileInputStream fis = null;
        BufferedReader reader = null;
        String s = null;
        try {
            fis = new FileInputStream(fileName);
            reader = new BufferedReader(new InputStreamReader(fis, "GBK"));
            while(true){
                s = reader.readLine();
                if(s == null) break;
                //由于目前尚未确定以何种方式发送，所以先打出log日志。
                //Log.i("info", s.toString());
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }finally{   // 关闭流
            try {
                reader.close();
                fis.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}