/*******************************************************************************
 * Copyright (c) 2004 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 * 
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.wst.css.ui.style;

import java.util.HashMap;
import java.util.Map;

import org.eclipse.jface.preference.IPreferenceStore;
import org.eclipse.jface.text.TextAttribute;
import org.eclipse.jface.util.PropertyChangeEvent;
import org.eclipse.wst.css.core.parser.CSSRegionContexts;
import org.eclipse.wst.css.ui.internal.CSSUIPlugin;
import org.eclipse.wst.sse.core.text.ITextRegion;
import org.eclipse.wst.sse.ui.style.AbstractLineStyleProvider;
import org.eclipse.wst.sse.ui.style.LineStyleProvider;

/**
 */
public class LineStyleProviderForCSS extends AbstractLineStyleProvider implements LineStyleProvider {
	/** Contains region to style mapping */
	private Map fColorTypes;

	/**
	 * LineStyleProviderForEmbeddedCSS constructor comment.
	 */
	public LineStyleProviderForCSS() {
		super();
		initAttributes();
		loadColors();
	}

	protected TextAttribute getAttributeFor(ITextRegion region) {
		if (region != null) {
			String type = region.getType();
			if (type != null) {
				return getAttributeFor(type);
			}
		}
		return (TextAttribute) getTextAttributes().get(IStyleConstantsCSS.NORMAL);
	}

	/**
	 * Look up the TextAttribute for the given region context. Might return
	 * null for unusual text.
	 * 
	 * @param type
	 * @return
	 */
	protected TextAttribute getAttributeFor(String type) {
		return (TextAttribute) getTextAttributes().get(fColorTypes.get(type));
	}

	private void initAttributes() {
		if (fColorTypes == null) {
			fColorTypes = new HashMap();
		}
		fColorTypes.put(CSSRegionContexts.CSS_COMMENT, IStyleConstantsCSS.COMMENT);
		fColorTypes.put(CSSRegionContexts.CSS_CDO, IStyleConstantsCSS.COMMENT);
		fColorTypes.put(CSSRegionContexts.CSS_CDC, IStyleConstantsCSS.COMMENT);
		fColorTypes.put(CSSRegionContexts.CSS_S, IStyleConstantsCSS.NORMAL);

		fColorTypes.put(CSSRegionContexts.CSS_DELIMITER, IStyleConstantsCSS.SEMI_COLON);
		fColorTypes.put(CSSRegionContexts.CSS_LBRACE, IStyleConstantsCSS.CURLY_BRACE);
		fColorTypes.put(CSSRegionContexts.CSS_RBRACE, IStyleConstantsCSS.CURLY_BRACE);

		fColorTypes.put(CSSRegionContexts.CSS_IMPORT, IStyleConstantsCSS.ATMARK_RULE);
		fColorTypes.put(CSSRegionContexts.CSS_PAGE, IStyleConstantsCSS.ATMARK_RULE);
		fColorTypes.put(CSSRegionContexts.CSS_MEDIA, IStyleConstantsCSS.ATMARK_RULE);
		fColorTypes.put(CSSRegionContexts.CSS_FONT_FACE, IStyleConstantsCSS.ATMARK_RULE);
		fColorTypes.put(CSSRegionContexts.CSS_CHARSET, IStyleConstantsCSS.ATMARK_RULE);
		fColorTypes.put(CSSRegionContexts.CSS_ATKEYWORD, IStyleConstantsCSS.ATMARK_RULE);

		fColorTypes.put(CSSRegionContexts.CSS_STRING, IStyleConstantsCSS.STRING);
		fColorTypes.put(CSSRegionContexts.CSS_URI, IStyleConstantsCSS.URI);
		fColorTypes.put(CSSRegionContexts.CSS_MEDIUM, IStyleConstantsCSS.MEDIA);
		fColorTypes.put(CSSRegionContexts.CSS_MEDIA_SEPARATOR, IStyleConstantsCSS.MEDIA);

		fColorTypes.put(CSSRegionContexts.CSS_CHARSET_NAME, IStyleConstantsCSS.STRING);

		fColorTypes.put(CSSRegionContexts.CSS_PAGE_SELECTOR, IStyleConstantsCSS.MEDIA);

		fColorTypes.put(CSSRegionContexts.CSS_SELECTOR_ELEMENT_NAME, IStyleConstantsCSS.SELECTOR);
		fColorTypes.put(CSSRegionContexts.CSS_SELECTOR_UNIVERSAL, IStyleConstantsCSS.SELECTOR);
		fColorTypes.put(CSSRegionContexts.CSS_SELECTOR_PSEUDO, IStyleConstantsCSS.SELECTOR);
		fColorTypes.put(CSSRegionContexts.CSS_SELECTOR_CLASS, IStyleConstantsCSS.SELECTOR);
		fColorTypes.put(CSSRegionContexts.CSS_SELECTOR_ID, IStyleConstantsCSS.SELECTOR);

		fColorTypes.put(CSSRegionContexts.CSS_SELECTOR_COMBINATOR, IStyleConstantsCSS.SELECTOR);
		fColorTypes.put(CSSRegionContexts.CSS_SELECTOR_SEPARATOR, IStyleConstantsCSS.SELECTOR);
		fColorTypes.put(CSSRegionContexts.CSS_SELECTOR_ATTRIBUTE_START, IStyleConstantsCSS.SELECTOR);
		fColorTypes.put(CSSRegionContexts.CSS_SELECTOR_ATTRIBUTE_END, IStyleConstantsCSS.SELECTOR);
		fColorTypes.put(CSSRegionContexts.CSS_SELECTOR_ATTRIBUTE_NAME, IStyleConstantsCSS.SELECTOR);
		fColorTypes.put(CSSRegionContexts.CSS_SELECTOR_ATTRIBUTE_VALUE, IStyleConstantsCSS.SELECTOR);
		fColorTypes.put(CSSRegionContexts.CSS_SELECTOR_ATTRIBUTE_OPERATOR, IStyleConstantsCSS.SELECTOR);

		fColorTypes.put(CSSRegionContexts.CSS_DECLARATION_PROPERTY, IStyleConstantsCSS.PROPERTY_NAME);
		fColorTypes.put(CSSRegionContexts.CSS_DECLARATION_VALUE_IDENT, IStyleConstantsCSS.PROPERTY_VALUE);
		fColorTypes.put(CSSRegionContexts.CSS_DECLARATION_VALUE_DIMENSION, IStyleConstantsCSS.PROPERTY_VALUE);
		fColorTypes.put(CSSRegionContexts.CSS_DECLARATION_VALUE_PERCENTAGE, IStyleConstantsCSS.PROPERTY_VALUE);
		fColorTypes.put(CSSRegionContexts.CSS_DECLARATION_VALUE_NUMBER, IStyleConstantsCSS.PROPERTY_VALUE);
		fColorTypes.put(CSSRegionContexts.CSS_DECLARATION_VALUE_FUNCTION, IStyleConstantsCSS.PROPERTY_VALUE);
		fColorTypes.put(CSSRegionContexts.CSS_DECLARATION_VALUE_PARENTHESIS_CLOSE, IStyleConstantsCSS.PROPERTY_VALUE);
		fColorTypes.put(CSSRegionContexts.CSS_DECLARATION_VALUE_STRING, IStyleConstantsCSS.PROPERTY_VALUE);
		fColorTypes.put(CSSRegionContexts.CSS_DECLARATION_VALUE_URI, IStyleConstantsCSS.PROPERTY_VALUE);
		fColorTypes.put(CSSRegionContexts.CSS_DECLARATION_VALUE_HASH, IStyleConstantsCSS.PROPERTY_VALUE);
		fColorTypes.put(CSSRegionContexts.CSS_DECLARATION_VALUE_UNICODE_RANGE, IStyleConstantsCSS.PROPERTY_VALUE);
		fColorTypes.put(CSSRegionContexts.CSS_DECLARATION_VALUE_IMPORTANT, IStyleConstantsCSS.PROPERTY_VALUE);
		fColorTypes.put(CSSRegionContexts.CSS_DECLARATION_VALUE_OPERATOR, IStyleConstantsCSS.PROPERTY_VALUE);
		fColorTypes.put(CSSRegionContexts.CSS_DECLARATION_VALUE_S, IStyleConstantsCSS.PROPERTY_VALUE);
		fColorTypes.put(CSSRegionContexts.CSS_DECLARATION_SEPARATOR, IStyleConstantsCSS.COLON);
		fColorTypes.put(CSSRegionContexts.CSS_DECLARATION_DELIMITER, IStyleConstantsCSS.SEMI_COLON);

		fColorTypes.put(CSSRegionContexts.CSS_UNKNOWN, IStyleConstantsCSS.NORMAL);
	}

	protected void handlePropertyChange(PropertyChangeEvent event) {
		String styleKey = null;

		if (event != null) {
			String prefKey = event.getProperty();
			// check if preference changed is a style preference
			if (IStyleConstantsCSS.ATMARK_RULE.equals(prefKey)) {
				styleKey = IStyleConstantsCSS.ATMARK_RULE;
			} else if (IStyleConstantsCSS.COLON.equals(prefKey)) {
				styleKey = IStyleConstantsCSS.COLON;
			} else if (IStyleConstantsCSS.COMMENT.equals(prefKey)) {
				styleKey = IStyleConstantsCSS.COMMENT;
			} else if (IStyleConstantsCSS.CURLY_BRACE.equals(prefKey)) {
				styleKey = IStyleConstantsCSS.CURLY_BRACE;
			} else if (IStyleConstantsCSS.ERROR.equals(prefKey)) {
				styleKey = IStyleConstantsCSS.ERROR;
			} else if (IStyleConstantsCSS.MEDIA.equals(prefKey)) {
				styleKey = IStyleConstantsCSS.MEDIA;
			} else if (IStyleConstantsCSS.NORMAL.equals(prefKey)) {
				styleKey = IStyleConstantsCSS.NORMAL;
			} else if (IStyleConstantsCSS.PROPERTY_NAME.equals(prefKey)) {
				styleKey = IStyleConstantsCSS.PROPERTY_NAME;
			} else if (IStyleConstantsCSS.PROPERTY_VALUE.equals(prefKey)) {
				styleKey = IStyleConstantsCSS.PROPERTY_VALUE;
			} else if (IStyleConstantsCSS.SELECTOR.equals(prefKey)) {
				styleKey = IStyleConstantsCSS.SELECTOR;
			} else if (IStyleConstantsCSS.SEMI_COLON.equals(prefKey)) {
				styleKey = IStyleConstantsCSS.SEMI_COLON;
			} else if (IStyleConstantsCSS.STRING.equals(prefKey)) {
				styleKey = IStyleConstantsCSS.STRING;
			} else if (IStyleConstantsCSS.URI.equals(prefKey)) {
				styleKey = IStyleConstantsCSS.URI;
			}
		} else {
			// this is around for old deprecated preferencesChanged() method
			// TODO remove when preferencesChanged() is removed
			loadColors();
			super.handlePropertyChange(event);
		}

		if (styleKey != null) {
			// overwrite style preference with new value
			addTextAttribute(styleKey);
			super.handlePropertyChange(event);
		}
	}

	public void release() {
		if (fColorTypes != null) {
			fColorTypes.clear();
		}
		super.release();
	}

	public void loadColors() {
		clearColors();
		addTextAttribute(IStyleConstantsCSS.ATMARK_RULE);
		addTextAttribute(IStyleConstantsCSS.COLON);
		addTextAttribute(IStyleConstantsCSS.COMMENT);
		addTextAttribute(IStyleConstantsCSS.CURLY_BRACE);
		addTextAttribute(IStyleConstantsCSS.ERROR);
		addTextAttribute(IStyleConstantsCSS.MEDIA);
		addTextAttribute(IStyleConstantsCSS.NORMAL);
		addTextAttribute(IStyleConstantsCSS.PROPERTY_NAME);
		addTextAttribute(IStyleConstantsCSS.PROPERTY_VALUE);
		addTextAttribute(IStyleConstantsCSS.SELECTOR);
		addTextAttribute(IStyleConstantsCSS.SEMI_COLON);
		addTextAttribute(IStyleConstantsCSS.STRING);
		addTextAttribute(IStyleConstantsCSS.URI);
	}

	protected void clearColors() {
		getTextAttributes().clear();
	}

	protected IPreferenceStore getColorPreferences() {
		return CSSUIPlugin.getDefault().getPreferenceStore();
	}
}