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/*******************************************************************************
 * Copyright 2011 See AUTHORS file.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 ******************************************************************************/

package com.badlogic.gdx.backends.gwt;

import com.badlogic.gdx.ApplicationLogger;
import com.badlogic.gdx.Gdx;
import com.google.gwt.user.client.ui.TextArea;

/**
 * Default implementation of {@link ApplicationLogger} for gwt
 */
public class GwtApplicationLogger implements ApplicationLogger {

	private TextArea log;

	public GwtApplicationLogger (TextArea log) {
		this.log = log;
	}

	@Override
	public void log (String tag, String message) {
		logText(tag + ": " + message, false);
	}

	private void logText(String message, boolean error) {
		if (log != null) {
			log.setText(log.getText() + "\n" + message + "\n");
			log.setCursorPos(log.getText().length() - 1);
		} else if (error) {
			consoleError(message);
		} else {
			consoleLog(message);
		}
	}

	native static public void consoleLog(String message) /*-{
		console.log( message );
	}-*/;

	native static public void consoleError(String message) /*-{
		console.error( message );
	}-*/;

	@Override
	public void log (String tag, String message, Throwable exception) {
		logText(tag + ": " + message + "\n" + getMessages(exception), false);
		logText(getStackTrace(exception), false);
	}

	@Override
	public void error (String tag, String message) {
		logText(tag + ": " + message, true);
	}

	@Override
	public void error (String tag, String message, Throwable exception) {
		logText(tag + ": " + message + "\n" + getMessages(exception), true);
		logText(getStackTrace(exception), false);
	}

	@Override
	public void debug (String tag, String message) {
		logText(tag + ": " + message, false);
	}

	@Override
	public void debug (String tag, String message, Throwable exception) {
		logText(tag + ": " + message + "\n" + getMessages(exception), false);
		logText(getStackTrace(exception), false);
	}

	private String getMessages (Throwable e) {
		StringBuilder sb = new StringBuilder();
		while (e != null) {
			sb.append(e.getMessage() + "\n");
			e = e.getCause();
		}
		return sb.toString();
	}

	private String getStackTrace (Throwable e) {
		StringBuilder sb = new StringBuilder();
		for (StackTraceElement trace : e.getStackTrace()) {
			sb.append(trace.toString() + "\n");
		}
		return sb.toString();
	}

}