import java.io.BufferedWriter;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.net.UnknownHostException;

public class XLog {

    /** log输出到本地文件开关 */
    private static boolean offset = true;
    private static String logPath = getHomeDirectory();

    public static void showLogArgs(String... args) {
        System.out.println(new Throwable().getStackTrace()[1]);
        StringBuilder argsS = new StringBuilder();
        for (int i = 0; i < args.length; i++) {
            argsS.append("参数 ").append(i).append(" = [").append(args[i]).append("]");
        }
        System.out.println(argsS.toString());
        file(argsS.toString(), "普通信息.txt");
    }

    public static void getChild(String... args) {
        System.out.println(new Throwable().getStackTrace()[2]);
        for (int i = 0; i < args.length; i++) {
            System.out.println("参数 " + i + " = [" + args[i] + "]");
            file(args[i], "普通信息.txt");
        }
    }

    public static void getGrandson(String... args) {
        System.out.println(new Throwable().getStackTrace()[1]);
        System.out.println(new Throwable().getStackTrace()[2]);
        System.out.println(new Throwable().getStackTrace()[3]);
        System.out.println(new Throwable().getStackTrace()[4]);
        System.out.println(new Throwable().getStackTrace()[5]);
        System.out.println(new Throwable().getStackTrace()[6]);
        System.out.println(new Throwable().getStackTrace()[7]);
        System.out.println(new Throwable().getStackTrace()[8]);
        for (int i = 0; i < args.length; i++) {
            System.out.println("参数 " + i + " = [" + args[i] + "]");
            file(args[i], "普通信息.txt");
        }
    }


    public static void showExceptionLogInfo(Exception msg) {
        String detilErrMsg = " " + msg + "\n详情:     " + new Throwable().getStackTrace()[1] + "";
        System.out.println("报错信息:" + detilErrMsg);
        file(getStackTraceString(msg) + "\n详细信息:\n" + detilErrMsg, "异常信息.txt");
    }

    public static void showLogInfo(String tag, Object msg) {
        String commonMsg = new Throwable().getStackTrace()[1] + "\n详情:   " + tag + ": " + msg;
        System.out.println("调用位置: " + commonMsg);
        file(msg.toString(), "普通信息.txt");
    }

    public static void showLogInfo(String msg) {
        String commonMsg = new Throwable().getStackTrace()[1] + "\n详情: " + msg + "";
        System.out.println("调用位置: " + commonMsg);
        file(msg, "普通信息.txt");
    }

//    /**
//     * 纯写文件
//     */
//    public static void file(String msg) {
//        try {
//            writeToFile(msg, getHomeDirectory() + "日志信息.log");
//        } catch (IOException e) {
//            e.printStackTrace();
//        }
//    }

    /**
     * @param msg 日志信息
     * @param logFileName 日志文件名称
     * @throws IOException IOException
     */
    private static void file(String msg, String logFileName) {
        if (!offset) {
            return;
        }
        if (logPath == null) {
            logPath = getHomeDirectory();
        }
        try {
            File file = new File(logPath + logFileName);
            if (!file.exists()) {
                file.createNewFile();
            }
            FileOutputStream out = new FileOutputStream(file, true);
            BufferedWriter writer = new BufferedWriter(
                new OutputStreamWriter(out, StandardCharsets.UTF_8));
            writer.write(msg + "\n");
            writer.flush();
            out.close();
            writer.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public static String getStackTraceString(Throwable tr) {
        if (tr == null) {
            return "";
        }
        // This is to reduce the amount of log spew that apps do in the non-error
        // condition of the network being unavailable.
        Throwable t = tr;
        while (t != null) {
            if (t instanceof UnknownHostException) {
                return "";
            }
            t = t.getCause();
        }
        StringWriter sw = new StringWriter();
        PrintWriter pw = new PrintWriter(sw, false);
        tr.printStackTrace(pw);
        pw.flush();
        return sw.toString();
    }

    /**
     * @return windows桌面路径
     */
    private static String getHomeDirectory() {
        javax.swing.filechooser.FileSystemView fsv = javax.swing.filechooser.FileSystemView
            .getFileSystemView();
//        System.out.println("桌面路径：" + fsv.getHomeDirectory());
//        System.out.println("默认路径：" + fsv.getDefaultDirectory());
//        System.getProperties().list(System.out);
        return fsv.getHomeDirectory().getPath() + File.separator;
    }

    public static void main(String[] args) {
        file("测试信息", "测试.log");
    }
}

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