package com.primeton.datainsight.task;

import com.google.common.base.Charsets;
import org.apache.commons.lang.SystemUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.BufferedWriter;
import java.io.Closeable;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.nio.charset.Charset;

/**
 * <p>
 * </p>
 * Created by zhaopx on 2018/1/12 0012-18:39
 */
public class LogOutputStream extends OutputStream implements Closeable {
	private static Logger logger = LoggerFactory.getLogger(LogOutputStream.class);
    /**
     * Job Id
     */
    final String jobId;

    /**
     * Task Id
     */
    final String taskId;


    /**
     * console 输出日志的编码， Windows 使用GBK
     */
    final java.nio.charset.Charset charset;


    /**
     * 日志输出流
     */
    BufferedWriter logWriter;


    /**
     * 缓冲大小
     */
    volatile long bufferSiuze = 0;


    /**
     * 获取 Task 的目录
     */
    final String taskDir;


    public LogOutputStream(String baseDir, String jobId, String taskId) {
        this.jobId = jobId;
        this.taskId = taskId;
        if(SystemUtils.IS_OS_WINDOWS) {
            charset = Charset.forName("GBK");
        } else {
            charset = Charsets.UTF_8;
        }

        // TODO Task dir
        File tasks = new File(baseDir);
        if(!tasks.exists() || tasks.isFile()){
            tasks.mkdirs();
        }

        File jobDir = new File(tasks, jobId);
        if(!jobDir.exists() || jobDir.isFile()){
            jobDir.mkdirs();
        }

        // 临时Job
        File taskDir = new File(jobDir, taskId);
        // 肯定不存在的
        if(!taskDir.exists()){
            taskDir.mkdirs();
        }
        this.taskDir = taskDir.getAbsolutePath();
        File logfile = new File(taskDir, "stdout");
        try {
            logWriter = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(logfile), "UTF-8"));
        } catch (Exception e) {
            logger.error("无法打开文件。", e);
        }
    }

    @Override
    public void write(int b) throws IOException {
        if(b > 0) {
            logger.info("unknown byte {}", b);
        }
    }


    /**
     * write one line
     * @param line one line
     * @return
     * @throws IOException
     */
    public void write(String line) throws IOException {
        if(logWriter != null) {
            try {
                logWriter.write(line);
                logWriter.flush();
            } catch (IOException e) {
            	logger.error(e.getMessage());
            }
        }
    }

    @Override
    public void write(byte[] b, int off, int len) throws IOException {
        String line = new String(b, off, len, charset);
        write(line);
    }


    @Override
    public void flush() throws IOException {
        if(logWriter != null) {
            logWriter.flush();
        }
    }

    @Override
    public void close() throws IOException {
        if(logWriter != null) {
            logWriter.flush();
            logWriter.close();
        }

        logWriter = null;
    }


    public String getTaskDir() {
        return taskDir;
    }
}