/*******************************************************************************
 * Copyright (c) 2009 Symbian Foundation and/or its subsidiary(-ies).
 * All rights reserved.
 * This component and the accompanying materials are made available
 * under the terms of the License "Eclipse Public License v1.0"
 * which accompanies this distribution, and is available
 * at the URL "http://www.eclipse.org/legal/epl-v10.html".
 *
 * Initial Contributors:
 * Symbian Foundation - initial contribution.
 * Contributors:
 * Description:
 * Overview:
 * Details:
 * Platforms/Drives/Compatibility:
 * Assumptions/Requirement/Pre-requisites:
 * Failures and causes:
 *******************************************************************************/
package org.symbian.tools.wrttools.core.internal.validation;

import java.io.IOException;

import org.eclipse.core.resources.IMarker;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Platform;
import org.eclipse.core.runtime.Status;
import org.eclipse.wst.validation.AbstractValidator;
import org.eclipse.wst.validation.ValidationResult;
import org.eclipse.wst.validation.ValidationState;
import org.eclipse.wst.validation.ValidatorMessage;
import org.w3c.css.css.DocumentParser;
import org.w3c.css.css.StyleSheet;
import org.w3c.css.parser.CssError;
import org.w3c.css.properties.PropertiesLoader;
import org.w3c.css.util.ApplContext;
import org.w3c.css.util.Warning;

public class CssBuildValidator extends AbstractValidator {
    @Override
    public ValidationResult validate(IResource resource, int kind, ValidationState state, IProgressMonitor monitor) {
        return main(resource.getLocationURI().toString(), resource);
    }

    public ValidationResult main(String uri, IResource resource) {
        String language = "en";
        String profile = "css3"; // css2, css21 (default), css3, svg, svgbasic,
        // svgtiny, atsc-tv, mobile, tv
        String medium = ""; // (default), aural, braille, embossed,
        // handheld, print, projection, screen,
        // tty, tv, presentation
        int warningLevel = 2; // -1 (no warning), 0, 1, 2 (default, all the
        // warnings)

        // first, we get the parameters and create an application context
        ApplContext ac = new ApplContext(language);

        if (profile != null && !"none".equals(profile)) {
            if ("css1".equals(profile) || "css2".equals(profile) || "css21".equals(profile) || "css3".equals(profile)
                    || "svg".equals(profile) || "svgbasic".equals(profile) || "svgtiny".equals(profile)) {
                ac.setCssVersion(profile);
            } else {
                ac.setProfile(profile);
                ac.setCssVersion(PropertiesLoader.config.getProperty("defaultProfile"));
            }
        } else {
            ac.setProfile(profile);
            ac.setCssVersion(PropertiesLoader.config.getProperty("defaultProfile"));
        }

        // medium to use
        ac.setMedium(medium);

        // HTML document
        try {
            DocumentParser urlParser = new DocumentParser(ac, uri);

            return handleRequest(ac, uri, urlParser.getStyleSheet(), warningLevel, true, resource);
        } catch (Exception e) {
            Platform.getLog(Platform.getBundle("org.w3c.css")).log(new Status(IStatus.ERROR, "org.w3c.css", null, e));
        }
        return null;
    }

    private ValidationResult handleRequest(ApplContext ac, String title, StyleSheet styleSheet, int warningLevel,
            boolean errorReport, IResource resource) throws Exception {

        if (styleSheet == null) {
            throw new IOException(ac.getMsg().getServletString("process") + " " + title);
        }

        styleSheet.findConflicts(ac);
        ValidationResult result = new ValidationResult();
        CssError[] errors = styleSheet.getErrors().getErrors();
        for (CssError cssError : errors) {
            String msg = cssError.getException().getLocalizedMessage();
            if (msg != null && msg.trim().length() > 0) {
                ValidatorMessage message = createMessage(resource, cssError.getLine(), msg, IMarker.SEVERITY_WARNING);
                result.add(message);
            }
        }
        Warning[] warnings = styleSheet.getWarnings().getWarnings();
        for (Warning warning : warnings) {
            ValidatorMessage message = createMessage(resource, warning.getLine(), warning.getWarningMessage(),
                    IMarker.SEVERITY_WARNING);
            result.add(message);
        }
        return result;
    }

    private ValidatorMessage createMessage(IResource resource, int line, String msg, int severity) {
        ValidatorMessage message = ValidatorMessage.create(msg, resource);
        message.setAttribute(IMarker.LINE_NUMBER, line);
        message.setAttribute(IMarker.SEVERITY, severity);
        return message;
    }
}