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package cn.hutool.log.dialect.slf4j;

import java.io.OutputStream;
import java.io.PrintStream;
import java.io.UnsupportedEncodingException;

import org.slf4j.LoggerFactory;
import org.slf4j.helpers.NOPLoggerFactory;

import cn.hutool.log.Log;
import cn.hutool.log.LogFactory;

/**
 * SLF4J log.

 * 同样无缝支持 LogBack
 * 
 * @author Looly
 *
 */
public class Slf4jLogFactory extends LogFactory {
	
	public Slf4jLogFactory() {
		this(true);
	}

	/**
	 * 构造
	 * 
	 * @param failIfNOP 如果未找到桥接包是否报错
	 */
	public Slf4jLogFactory(boolean failIfNOP) {
		super("Slf4j");
		checkLogExist(LoggerFactory.class);
		if(false == failIfNOP){
			return;
		}

		// SFL4J writes it error messages to System.err. Capture them so that the user does not see such a message on
		// the console during automatic detection.
		final StringBuilder buf = new StringBuilder();
		final PrintStream err = System.err;
		try {
			System.setErr(new PrintStream(new OutputStream(){
				@Override
				public void write(int b) {
					buf.append((char) b);
				}
			}, true, "US-ASCII"));
		} catch (UnsupportedEncodingException e) {
			throw new Error(e);
		}

		try {
			if (LoggerFactory.getILoggerFactory() instanceof NOPLoggerFactory) {
				throw new NoClassDefFoundError(buf.toString());
			} else {
				err.print(buf);
				err.flush();
			}
		} finally {
			System.setErr(err);
		}
	}

	@Override
	public Log createLog(String name) {
		return new Slf4jLog(name);
	}

	@Override
	public Log createLog(Class clazz) {
		return new Slf4jLog(clazz);
	}

}