package com.basic.security.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 org.springframework.util.FileCopyUtils;

import java.io.File;
import java.io.FileOutputStream;
import java.io.FileReader;
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;

/**
 * <h3>全局捕获异常</h3>
 * <br>
 * 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";
    private static com.basic.security.utils.CrashHandler instance = new com.basic.security.utils.CrashHandler();
    private static DateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
    private Thread.UncaughtExceptionHandler mDefaultHandler;
    private Context mContext;
    private Map<String, String> infos = new HashMap<String, String>();

    private CrashHandler() {
    }

    public static com.basic.security.utils.CrashHandler getInstance() {
        return instance;
    }

    public static String getErrorContent() {
        String time = formatter.format(new Date());
        String fileName = "crash-" + time + ".log";
        String content = "";
        try {
            String path = getGlobalpath();
            File dir = new File(path);
            if (!dir.exists())
                dir.mkdirs();
            File file = new File(path + fileName);
            if (file.exists()) {
                content = FileCopyUtils.copyToString(new FileReader(file));
            }
        } catch (Exception e) {
            ExceptionUtil.printException(e);
        }
        return content;
    }

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

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

    public void init(Context context) {
        mContext = context;
        mDefaultHandler = Thread.getDefaultUncaughtExceptionHandler();
        Thread.setDefaultUncaughtExceptionHandler(this);
    }

    public void uncaughtException(Thread thread, Throwable ex) {
        handleException(ex);
    }

    private boolean handleException(Throwable ex) {
        collectDeviceInfo(mContext);
        try {
            saveCrashInfoFile(ex);
        } catch (Exception e) {
            ExceptionUtil.printException(e);
        }
        AppUtil.restartApp(mContext);
        return true;
    }

    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) {
            System1.out.println("CrashHandler.collectDeviceInfo " + e.getMessage());
        }
        Field[] fields = Build.class.getDeclaredFields();
        for (Field field : fields) {
            try {
                field.setAccessible(true);
                infos.put(field.getName(), field.get(null).toString());
            } catch (Exception e) {
                System1.out.println("CrashHandler.collectDeviceInfo " + e.getMessage());
            }
        }
    }

    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 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);
            return writeFile(sb.toString());
        } catch (Exception e) {
            System1.out.println("CrashHandler.saveCrashInfoFile " + e.getMessage());
            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";
        System1.out.println("CrashHandler.writeFile " + sb);
        if (true) {
            String path = getGlobalpath();
            File dir = new File(path);
            if (!dir.exists())
                dir.mkdirs();
            FileOutputStream fos = new FileOutputStream(path + fileName, true);
            fos.write(sb.getBytes());
            fos.flush();
            fos.close();
        }
        return fileName;
    }
}