package net.sourceforge.fenixedu.presentationTier.renderers;

import net.sourceforge.fenixedu.presentationTier.Action.manager.functionalities.ParserReport;
import pt.ist.fenixWebFramework.renderers.OutputRenderer;
import pt.ist.fenixWebFramework.renderers.components.HtmlComponent;
import pt.ist.fenixWebFramework.renderers.components.HtmlContainer;
import pt.ist.fenixWebFramework.renderers.components.HtmlPreformattedText;
import pt.ist.fenixWebFramework.renderers.components.HtmlText;
import pt.ist.fenixWebFramework.renderers.layouts.Layout;
import pt.ist.fenixWebFramework.renderers.utils.RenderUtils;

/**
 * This renderer is used to present a {@link ParserReport}. The report
 * expressoin is presented and the position of the error is shown.
 * 
 * <p>
 * Example:
 * 
 * <pre>
 * this.is.an.&lt;span title=&quot;unexpected token '.'&quot; style=&quot;background: #FAA;&quot;&gt;.&lt;/span&gt;error
 * </pre>
 * 
 * <pre>
 * $user.&lt;span title=&quot;method 'address' does not exist&quot; style=&quot;background: #FAA;&quot;&gt;address(home)&lt;/span&gt;.name
 * </pre>
 * 
 * @author cfgi
 */
public class ParserReportRenderer extends OutputRenderer {

    private String bundle;

    private String errorClass;
    private String errorStyle;

    protected String getBundle() {
	return this.bundle;
    }

    /**
     * Sets the bundle to be used to localize a localized report message.
     * 
     * @property
     */
    protected void setBundle(String bundle) {
	this.bundle = bundle;
    }

    public String getErrorClass() {
	return this.errorClass;
    }

    /**
     * Chooses the html classes for the error region.
     * 
     * @property
     */
    public void setErrorClass(String errorClass) {
	this.errorClass = errorClass;
    }

    public String getErrorStyle() {
	return this.errorStyle;
    }

    /**
     * Chooses the css style for the error region.
     * 
     * @property
     */
    public void setErrorStyle(String errorStyle) {
	this.errorStyle = errorStyle;
    }

    @Override
    protected Layout getLayout(Object object, Class type) {
	return new Layout() {

	    @Override
	    public HtmlComponent createComponent(Object object, Class type) {
		if (object == null) {
		    return new HtmlText();
		}

		ParserReport report = (ParserReport) object;

		HtmlContainer container = new HtmlPreformattedText();
		container.setIndented(false);

		String expression = report.getExpression() + " " /*
								  * because of
								  * 'premature
								  * end' errors
								  */;

		int startIndex = findIndex(report.getStartLine(), report.getStartColumn(), expression);
		int endIndex;

		if (report.hasRangedLineInformation()) {
		    endIndex = findIndex(report.getEndLine(), report.getEndColumn(), expression) + 1;
		} else {
		    endIndex = startIndex + 1;
		}

		HtmlText befor = new HtmlText(expression.substring(0, startIndex));
		HtmlText error = new HtmlText(expression.substring(startIndex, endIndex));
		HtmlText after = new HtmlText(expression.substring(endIndex));

		if (error.getText().length() == 0 || error.getText().equals(" ")) {
		    error = new HtmlText("&nbsp;", false);
		}

		container.addChild(befor);
		container.addChild(error);
		container.addChild(after);

		error.setClasses(getErrorClass());
		error.setStyle(getErrorStyle());
		error.setTitle(getReportMessage(report));

		return container;
	    }

	    private String getReportMessage(ParserReport report) {
		if (report.isResource()) {
		    String message = RenderUtils.getResourceString(getBundle(), report.getKey(), report.getArgs());
		    return message == null ? report.getKey() : message;
		} else {
		    return HtmlText.escape(report.getKey());
		}
	    }

	    private int findIndex(int lineNumber, int columnNumber, String text) {
		String[] lines = text.split("\n");

		int index = 0;
		for (int i = 0; i < lines.length; i++) {
		    String line = lines[i];

		    if (i < lineNumber - 1) {
			index += line.length() + 1 /* "\n".length() */;
		    }

		    if (i == lineNumber - 1) {
			index += columnNumber - 1;
		    }
		}

		return index;
	    }
	};
    }

}