package com.stu.assistant.uitls;

import android.content.Context;
import android.content.pm.ApplicationInfo;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
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.reflect.Field;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;


/**
 * Created by stf on 2018-11-05.
 */

public class CrashHandler implements Thread.UncaughtExceptionHandler {

    public String TAG = "CrashHandler";
    // 系统默认的UncaughtException处理类
    private Thread.UncaughtExceptionHandler mDefaultHandler;
    // CrashHandler实例
    private static CrashHandler INSTANCE;
    // 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>();
    //显示时间
    private long time;
    //文件夹地址
    private String pathCrashHandler = "CrashLog";

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

    }

    /**
     * 获取CrashHandler实例 ,单例模式
     */
    public static CrashHandler getInstance() {
        if (INSTANCE == null) {
            INSTANCE = new CrashHandler();
        }
        return INSTANCE;
    }

    /**
     * 初始化
     */

    public CrashHandler setDelayTime(long time) {
        this.time = time;
        return this;
    }

    public CrashHandler setTAG(String TAG) {
        this.TAG = TAG;
        return this;
    }

    public CrashHandler setPath(String pathCrashHandler) {
        this.pathCrashHandler = pathCrashHandler;
        return this;
    }

//    public CrashHandler setPath() {
//        this.pathCrashHandler = AppConfig.Path_Crash;
//        return this;
//    }

    public void init(Context context) {
        mContext = context;
        if (isAppDeBug()) {
            Log.i("stf", "-app在-debug->");
            // 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);
        } else {
            Log.i("stf", "-app在-realse->");
        }
    }

    /**
     * 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(time);
            } 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
     * @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;
        }
        ex.printStackTrace();

        // 使用Toast来显示异常信息
        new Thread() {
            @Override
            public void run() {
                Looper.prepare();
                try {
                    Toast.makeText(mContext, "程序出现异常,清理app进程后,可清除此卡顿", Toast.LENGTH_LONG).show();
                }catch (Exception e){
                    e.fillInStackTrace();
                }
                Looper.loop();
            }
        }.start();
        // 收集设备参数信息
        collectDeviceInfo(mContext);
        // 保存日志文件
        saveCrashInfo2File(ex);
        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 == 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.e(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 saveCrashInfo2File(Throwable ex) {
        DateFormat formatter = new SimpleDateFormat("yyyy-MM-dd-HH-mm-ss");
        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 = "log-" + time + "-" + timestamp + ".log";
            if (Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState())) {
                String path = Environment.getExternalStorageState() + "/" + pathCrashHandler + "/log";
                File dir = new File(path);
                if (!dir.exists()) {
                    dir.mkdirs();
                }
                Log.e(TAG, "错误日志记录位置=" + dir.getAbsolutePath());
                FileOutputStream fos = new FileOutputStream(path + "/" + fileName);
                fos.write(sb.toString().getBytes());
                fos.close();
            }
            return fileName;
        } catch (Exception e) {
            Log.e(TAG, "an error occured while writing file..." + e);
        }
        return null;
    }

    // 判断app 是不是 debug模式
    public boolean isAppDeBug() {

        if (mContext == null) {
            return false;
        }
        try {
            if (TextUtils.isEmpty(mContext.getPackageName())) {
                return false;
            }
        } catch (Exception e) {
            e.fillInStackTrace();
            return false;
        }

        try {
            PackageManager pm = mContext.getPackageManager();
            ApplicationInfo ai = pm.getApplicationInfo(mContext.getPackageName(), 0);
            return ai != null && (ai.flags & ApplicationInfo.FLAG_DEBUGGABLE) != 0;
        } catch (PackageManager.NameNotFoundException e) {
            e.printStackTrace();
            return false;
        }
    }
}
