/*******************************************************************************
 * Copyright (c) 2007 Exadel, Inc. and Red Hat, Inc.
 * Distributed under license by Red Hat, Inc. All rights reserved.
 * This program is 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:
 *     Exadel, Inc. and Red Hat, Inc. - initial API and implementation
 ******************************************************************************/ 
package org.jboss.tools.jsf.text.ext.hyperlink;

import java.text.MessageFormat;
import java.util.List;
import java.util.Properties;

import org.eclipse.core.resources.IFile;
import org.eclipse.jface.text.BadLocationException;
import org.eclipse.jface.text.IRegion;
import org.eclipse.jface.text.Region;
import org.jboss.tools.common.model.XModel;
import org.jboss.tools.common.text.ext.hyperlink.AbstractHyperlink;
import org.jboss.tools.common.text.ext.util.StructuredModelWrapper;
import org.jboss.tools.jst.text.ext.util.TaglibManagerWrapper;
import org.jboss.tools.common.text.ext.util.Utils;
import org.jboss.tools.jsf.text.ext.JSFExtensionsPlugin;
import org.jboss.tools.jsf.text.ext.JSFTextExtMessages;
import org.jboss.tools.jst.web.project.list.WebPromptingProvider;
import org.w3c.dom.Attr;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.Text;

/**
 * @author Jeremy
 */
public class JsfJSPTagAttributeHyperlink extends AbstractHyperlink {

	/**
	 * @see AbstractHyperlink#doHyperlink(org.eclipse.jface.text.IRegion)
	 */
	protected void doHyperlink(IRegion region) {
		IFile documentFile = getFile();
		XModel xModel = getXModel(documentFile);
		if (xModel == null) {
			openFileFailed();
			return;
		}
		WebPromptingProvider provider = WebPromptingProvider.getInstance();
		
		Properties p = getRequestProperties(region);
		p.put(WebPromptingProvider.FILE, documentFile);
		List<Object> list = provider.getList(xModel, WebPromptingProvider.JSF_OPEN_TAG_LIBRARY, p.getProperty("prefix"), p); //$NON-NLS-1$
		if (list != null && list.size() >= 1) {
			openFileInEditor((String)list.get(0));
			return;
		}
		String error = p.getProperty(WebPromptingProvider.ERROR); 
		if ( error != null && error.length() > 0) {
			openFileFailed();
		}
	}
	

	protected Properties getRequestProperties(IRegion region) {
		Properties p = new Properties();
		
		String value = getURI(region);
		if (value != null) {
			p.setProperty("prefix", value); //$NON-NLS-1$
		}
		value = getTagName(region);
		if (value != null) {
			p.setProperty(WebPromptingProvider.NAME, value);
		}
		value = getTagAttributeName(region);
		if (value != null) {
			p.setProperty(WebPromptingProvider.ATTRIBUTE, value);
		}
		
		return p;
	}
	
	private String getURI(IRegion region) {
		StructuredModelWrapper smw = new StructuredModelWrapper();
		smw.init(getDocument());
		try {
			Document xmlDocument = smw.getDocument();
			if (xmlDocument == null) return null;

			Node n = Utils.findNodeForOffset(xmlDocument, region.getOffset());

			if (n instanceof Attr) {
				n = ((Attr)n).getOwnerElement();
			}
			if (!(n instanceof Element)) return null;
			
			Node node = n.getParentNode();

			String nodeName = node.getNodeName();
			if (nodeName.indexOf(':') == -1) return null;

			String nodePrefix = nodeName.substring(0, nodeName.indexOf(":")); //$NON-NLS-1$
			if (nodePrefix == null || nodePrefix.length() == 0) return null;

			TaglibManagerWrapper tmw = new TaglibManagerWrapper();
			tmw.init(getDocument(), region.getOffset());
			
			if (!tmw.exists()) return null;
			
			return tmw.getUri(nodePrefix);
		} finally {
			smw.dispose();
		}
	}
	
	private String getTagName(IRegion region) {
		if(region == null) return null;
		StructuredModelWrapper smw = new StructuredModelWrapper();
		smw.init(getDocument());
		try {
			Document xmlDocument = smw.getDocument();
			if (xmlDocument == null) return null;
			
			Node n = Utils.findNodeForOffset(xmlDocument, region.getOffset());

			if (n instanceof Attr) {
				n = ((Attr)n).getOwnerElement();
			}
			if (!(n instanceof Element)) return null;
			
			Node node = n.getParentNode();

			String tagName = node.getNodeName();
			if (tagName.indexOf(':') == -1) return null;
			
			return tagName.substring(tagName.indexOf(':') + 1);
		} finally {
			smw.dispose();
		}
	}
	
	IRegion fLastRegion = null;
	/** 
	 * @see com.ibm.sse.editor.AbstractHyperlink#doGetHyperlinkRegion(int)
	 */
	protected IRegion doGetHyperlinkRegion(int offset) {
		fLastRegion = getRegion(offset);
		return fLastRegion;
	}
	
	private String getTagAttributeName(IRegion region) {
		if(region == null || getDocument() == null) return null;
		try {
			return Utils.trimQuotes(getDocument().get(region.getOffset(), region.getLength()));
		} catch (BadLocationException x) {
			JSFExtensionsPlugin.log("", x); //$NON-NLS-1$
			return null;
		}
	}
	
	
	protected IRegion getRegion (int offset) {
		StructuredModelWrapper smw = new StructuredModelWrapper();
		smw.init(getDocument());
		try {
			Document xmlDocument = smw.getDocument();
			if (xmlDocument == null) return null;
			
			Node n = Utils.findNodeForOffset(xmlDocument, offset);

			if (n == null || !(n instanceof Attr || n instanceof Text)) return null;

			int start = Utils.getValueStart(n);
			int end = Utils.getValueEnd(n);

			if (start > offset || end < offset) return null;

			String text = getDocument().get(start, end - start);
			StringBuffer sb = new StringBuffer(text);

			//find start and end of class property
			int bStart = 0;
			int bEnd = text.length() - 1;

			while (bStart < bEnd && (Character.isWhitespace(sb.charAt(bStart)) 
					|| sb.charAt(bStart) == '\"' || sb.charAt(bStart) == '\"')) { 
				bStart++;
			}
			while (bEnd > bStart && (Character.isWhitespace(sb.charAt(bEnd)) 
					|| sb.charAt(bEnd) == '\"' || sb.charAt(bEnd) == '\"')) { 
				bEnd--;
			}
			bEnd++;

			final int propStart = bStart + start;
			final int propLength = bEnd - bStart;
			
			if (propStart > offset || propStart + propLength < offset) return null;

			return new Region(propStart,propLength);
		} catch (BadLocationException x) {
			JSFExtensionsPlugin.log("", x); //$NON-NLS-1$
			return null;
		} finally {
			smw.dispose();
		}
	}
	
	/*
	 * (non-Javadoc)
	 * 
	 * @see IHyperlink#getHyperlinkText()
	 */
	public String getHyperlinkText() {
		String tagName = getTagName(fLastRegion);
		String attrName = getTagAttributeName(fLastRegion);
		if (tagName == null || attrName == null)
			return JSFTextExtMessages.OpenTagLibraryForAnAttribute;
		
		return MessageFormat.format(JSFTextExtMessages.OpenTagLibraryForAttributeName, attrName, tagName);
	}

}
