package util;

import gui.GuiManager;

import java.awt.Graphics2D;
import java.awt.SystemColor;
import java.awt.geom.Rectangle2D;
import java.awt.image.BufferedImage;
import java.net.URL;

import javax.swing.ImageIcon;

import org.apache.commons.io.IOUtils;
import org.apache.log4j.Logger;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.Font;
import org.eclipse.swt.graphics.FontMetrics;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.ImageData;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.widgets.Text;

/**
 * Helper class for loading resources. This should be error safe loaders with a
 * fall back in case the requested resource can't be found, or isn't of the
 * expected type.
 */
public class ResourceLoader {

	/**
	 * Logger for this class
	 */
	private final static Logger LOGGER = Logger.getLogger(ResourceLoader.class);

	public static ImageData getImageData(String path) {

		ImageData _imgData = null;
		URL _url = ResourceLoader.class.getResource(path);
		if (_url == null) {
			LOGGER.error("Resource not found: " + path);
			return errorIcon("nope").getImageData();
		} else {
			try {
				_imgData = new ImageData(_url.openStream());
			} catch (Exception e) {
				LOGGER.error("Resource not loadable: " + path + ". See trace: ", e);
				return errorIcon("nope").getImageData();
			}
			return _imgData;
		}
	}

	 /**
	 * Helper that will create an icon with given text.
	 * @param errorText Text to render to icon
	 * @return the icon
	 */
	private static Image errorIcon(String errorText) {
		GC gc = new GC(GuiManager.getDisplay());
		Font font = new Font(GuiManager.getDisplay(), "Tahoma", 20, SWT.NORMAL);
		gc.setFont(font);
		// get dimensions of text
    Image image = new Image(GuiManager.getDisplay(), gc.stringExtent(errorText).x, gc.stringExtent(errorText).y);
    GC gc2 = new GC(image);
    gc2.setBackground(GuiManager.getDisplay().getSystemColor(SWT.COLOR_CYAN));
    gc2.drawText(errorText, 0, 0);
    gc2.dispose();
    return image;
	}

	/**
	 * Tries to load the given resource treating it as a text file
	 * 
	 * @param path
	 *          Resource path to load
	 * @return content of the loaded resource as String
	 */
	public static String getTextFile(String path) {
		String fileContent = null;
		try {
			fileContent = IOUtils.toString(ResourceLoader.class
					.getResourceAsStream(path));
		} catch (Exception e) {
			LOGGER.error("IO error while trying to load resource '" + path
					+ "'. See trace: ", e);
		}

		if (fileContent != null) {
			return fileContent;
		} else {
			return "Resource '" + path + "' not found.";
		}
	}
}