/*******************************************************************************
 * Copyright (c) 2006 Sybase, Inc. 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:
 *     Sybase, Inc. - initial API and implementation
 *******************************************************************************/
package org.eclipse.jst.pagedesigner.utils;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLDecoder;
import java.util.HashMap;
import java.util.Map;
import java.util.StringTokenizer;

import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IFolder;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.Path;
import org.eclipse.jst.jsf.common.ui.IFileFolderConstants;
import org.eclipse.jst.jsf.common.ui.internal.logging.Logger;
import org.eclipse.jst.jsf.common.ui.internal.utils.ResourceUtils;
import org.eclipse.jst.jsf.common.ui.internal.utils.WebrootUtil;
import org.eclipse.jst.pagedesigner.PDPlugin;
import org.eclipse.jst.pagedesigner.css2.property.ICSSPropertyID;
import org.eclipse.wst.common.uriresolver.internal.util.URIHelper;
import org.eclipse.wst.sse.core.StructuredModelManager;
import org.eclipse.wst.sse.core.internal.provisional.IModelManager;
import org.eclipse.wst.sse.core.internal.util.URIResolver;
import org.eclipse.wst.xml.core.internal.provisional.document.IDOMModel;
import org.w3c.dom.DOMException;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

/**
 * A URIResolver implementation
 *
 */
public class ProjectResolver implements URIResolver {
	private static final String TLD_TAG_URI = "uri"; //$NON-NLS-1$

	private static final String URI_PREFIX_HTTP = "http"; //$NON-NLS-1$

	private static final String FILE_PROTOCOL = "file"; //$NON-NLS-1$

	/** Create the logger for this class */
	private static Logger _log = PDPlugin.getLogger(ProjectResolver.class);

	private IProject _project = null;

	private String _fileBaseLocation = null;

	private static Map _uriMap = null;

	/**
	 * It is strongly recommended that clients use
	 * project.getAdapter(URIResolver.class) to obtain a URIResolver aware of
	 * the Project's special requirements. Note that a URIResolver may not be
	 * returned at all so manually creating this object may still be required.
	 * @param project
	 */
	public ProjectResolver(IProject project) {
		super();
		_project = project;
	}

	/**
	 * @param path
	 */
	public void seekTld(IFolder path) {
		if (path == null) {
			return;
		}
		if (_uriMap == null) {
			_uriMap = new HashMap();
		}

		try {
			IResource[] res = path.members();
			if (null == res) {
				return;
			}
			for (int i = 0; i < res.length; i++) {
				if (res[i] instanceof IFolder) {
					seekTld((IFolder) res[i]);
				}
				String ext = res[i].getFileExtension();
				if (IFileFolderConstants.EXT_TAGLIB.equalsIgnoreCase(ext)) {
					IFile tldFile = (IFile) res[i];
					String uri = getURIfromTLD(tldFile);
					String locate = tldFile.getLocation().toOSString();
					if (uri != null && _uriMap.get(uri) == null) {
						_uriMap.put(uri, locate);
					}
				}
			}
		} catch (CoreException e) {
			_log.error("Error.ProjectResolver.GetlocationByURI.0", e); //$NON-NLS-1$
		}
	}

	/**
	 * @param path
	 */
	public void seekTld(File path) {
		if (path == null || !path.isDirectory()) {
			return;
		}
		if (_uriMap == null) {
			_uriMap = new HashMap();
		}

		try {
			File[] res = path.listFiles();
			if (null == res) {
				return;
			}
			for (int i = 0; i < res.length; i++) {
				if (res[i] instanceof IFolder) {
					seekTld(res[i]);
				}

				if (res[i].getName().endsWith(
						IFileFolderConstants.DOT
								+ IFileFolderConstants.EXT_TAGLIB)) {
					String uri = getURIfromTLD(res[i]);
					String locate;

					locate = res[i].getCanonicalPath();

					if (uri != null && _uriMap.get(uri) == null) {
						_uriMap.put(uri, locate);
					}
				}
			}
		} catch (IOException e1) {
			_log.error("Error.ProjectResolver.GetlocationByURI.0", e1); //$NON-NLS-1$
		}
	}

	/**
	 * @param tldFile
	 * @return the uri for the tld in tldFile or null
	 */
	public String getURIfromTLD(File tldFile) {

		if (tldFile == null) {
			return null;
		}
		IDOMModel tldModel = null;

		InputStream in = null;
		try {
			in = new FileInputStream(tldFile);
		} catch (FileNotFoundException e) {
			_log.error("RenderingTraverser.Error.FileNotFound", e); //$NON-NLS-1$
			return null;
		}
//		IDOMModel xmlModel = null;

		try {
			tldModel = (IDOMModel) StructuredModelManager.getModelManager().getModelForRead(
					tldFile.getAbsolutePath(), in, null);
			NodeList uriList = tldModel.getDocument().getElementsByTagName(
					TLD_TAG_URI);
			for (int i = 0, n = uriList.getLength(); i < n; i++) {
				Node uri = uriList.item(i);
				return uri.getChildNodes().item(0).getNodeValue();
			}
		} catch (UnsupportedEncodingException e1) {
			_log.error("RenderingTraverser.Error.UnsupportedEncoding", e1); //$NON-NLS-1$
		} catch (IOException e1) {
			_log.error("RenderingTraverser.Error.IO", e1); //$NON-NLS-1$
		} finally {
			ResourceUtils.ensureClosed(in);
			
			if (tldModel != null)
			{
			    tldModel.releaseFromRead();
			}
		}

		return null;
	}

	/**
	 * @param tldFile
	 * @return the URI for the TLD in tldFile or null
	 */
	public String getURIfromTLD(IFile tldFile) {
		if (tldFile == null) {
			return null;
		}
		IDOMModel tldModel;

		try {
			tldModel = (IDOMModel) getModelManager().getModelForRead(tldFile);
			NodeList uriList = tldModel.getDocument().getElementsByTagName(
					TLD_TAG_URI);
			for (int i = 0, n = uriList.getLength(); i < n; i++) {
				Node uri = uriList.item(i);
				return uri.getChildNodes().item(0).getNodeValue();
			}
		} catch (IOException e) {
			// Error in taglib locating.
			_log.error("Error.ProjectResolver.GetlocationByURI.0", e); //$NON-NLS-1$
		} catch (CoreException e1) {
			_log.error("Error.ProjectResolver.GetlocationByURI.0", e1); //$NON-NLS-1$
		}
		return null;
	}

	/**
	 * initialize the map of tlds
	 */
	public void initTldMap() {
		if (_uriMap == null) {
			_uriMap = new HashMap();
		}
		if (_project == null) {
			return;
		}
		if (WebrootUtil.getWebContentFolder(_project) == null) {
			return;
		}
		IFolder webinf = WebrootUtil.getWebContentFolder(_project).getFolder(
				IFileFolderConstants.FOLDER_WEBINF);
		if (webinf != null && webinf.exists()) {
			seekTld(webinf);
		}

		String locate = PDPlugin.getInstallLocation().append("/jsf-tld") //$NON-NLS-1$
				.toString();
		File jsfDir = new File(locate);
		seekTld(jsfDir);

	}

	public java.lang.String getFileBaseLocation() {
		return _fileBaseLocation;
	}

	public java.lang.String getLocationByURI(String uri) {
		// System.out.println(getLocationByURI(uri, getFileBaseLocation()));
		return getLocationByURI(uri, getFileBaseLocation());
	}

	private IModelManager getModelManager() {
		return StructuredModelManager.getModelManager();
	}

	private String getLocationFromWEBXML(String uri, String baseReference) {
		if (uri == null) {
			return null;
		}
		try {
			// if (_project.hasNature(ICommonConstants.NATURE_WEBAPP))
			// {
			if (uri.startsWith(IFileFolderConstants.PATH_SEPARATOR)) {
				uri = _project.getProject().getLocation().toString()
						+ IFileFolderConstants.PATH_SEPARATOR
						+ WebrootUtil.getWebContentFolderName(_project) + uri;
			}
			if (uri.startsWith(URI_PREFIX_HTTP)) {
				IFile webxml = WebrootUtil.getWebContentFolder(_project)
						.getFolder(IFileFolderConstants.FOLDER_WEBINF).getFile(
								IFileFolderConstants.FILE_WEB_XML);
				IDOMModel xmlModel;

				if (webxml.exists()) {
					try {
						xmlModel = (IDOMModel) getModelManager()
								.getModelForRead(webxml);

						NodeList taglibNodeList = xmlModel
								.getDocument()
								.getElementsByTagName(ICSSPropertyID.TAG_TAGLIB);

						for (int i = 0, size = taglibNodeList.getLength(); i < size; i++) {
							Node taglibNode = taglibNodeList.item(i);

							NodeList childList = taglibNode.getChildNodes();
							String taguri = ""; //$NON-NLS-1$
							String taglocation = ""; //$NON-NLS-1$
							for (int j = 0, childSize = childList.getLength(); j < childSize; j++) {
								Node childTaglibNode = childList.item(j);
								if (ICSSPropertyID.ATTR_TAGLIB_URI
										.equalsIgnoreCase(childTaglibNode
												.getNodeName())) {
									taguri = childTaglibNode.getChildNodes()
											.item(0).getNodeValue();
								}
								if (ICSSPropertyID.ATTR_TAGLIB_LOCATION
										.equalsIgnoreCase(childTaglibNode
												.getNodeName())) {
									taglocation = childTaglibNode
											.getChildNodes().item(0)
											.getNodeValue();
								}

							}
							if (uri.equalsIgnoreCase(taguri))
								uri = _project.getProject().getLocation()
										.toString()
										+ IFileFolderConstants.PATH_SEPARATOR
										+ WebrootUtil
												.getWebContentFolderName(_project)
										+ taglocation;
						}
						xmlModel.releaseFromRead();
					} catch (IOException e) {

						// Error in taglib locating.
						_log.error(
								"Error.ProjectResolver.GetlocationByURI.0", e); //$NON-NLS-1$
					} catch (CoreException e1) {
						e1.printStackTrace();
						_log.error("Error.ProjectResolver.GetlocationByURI.0", //$NON-NLS-1$
								e1);
					}

				}
			}
			// }
		} catch (DOMException e1) {
			// Error in taglib locating.
			_log.error("Error.ProjectResolver.GetlocationByURI.0", e1); //$NON-NLS-1$
		}
		// catch (CoreException e1)
		// {
		//
		// _log.error("Error.ProjectResolver.GetlocationByURI.0", e1);
		// }

		if (isFileURL(uri)) {
			try {
				URL url = new URL(uri);
				return getPath(url);
			} catch (MalformedURLException e) {
				_log.error("Error.ProjectResolver.GetlocationByURI.0", e); //$NON-NLS-1$
			}
		}
		// defect 244817 end
		return URIHelper.normalize(uri, baseReference, getRootLocationString());

	}

	public String getLocationByURI(String uri, String baseReference) {
		// DataWindow may generate URL like "d:\somefile" (dos path). We may
		// need some
		// special support. (lium)
		int columnIndex = uri.indexOf(":"); //$NON-NLS-1$
		int slashIndex = uri.indexOf("/"); //$NON-NLS-1$
		if (columnIndex != -1 && (slashIndex == -1 || columnIndex < slashIndex)) {
			return uri;
		}
		try {
			uri = URLDecoder.decode(uri, "UTF-8");  //$NON-NLS-1$
		} catch (UnsupportedEncodingException e) {
			// suppress this.  the user's data may be invalid.
		}
		String result = getLocationFromWEBXML(uri, baseReference);
		if (result != null && !result.equals(uri)) {
			return result;
		}
		if (_uriMap == null) {
			initTldMap();
		}
		if (_uriMap != null) {
			return (String) _uriMap.get(uri);
		}
		return null;
	}

	// defect 244817 start
	/**
	 * @param passedSpec
	 * @return boolean
	 */
	private boolean isFileURL(String passedSpec) {
		if (passedSpec == null) {
			return false;
		}
		final String spec = passedSpec.trim();
		if (spec.length() == 0) {
			return false;
		}
		String newProtocol = null;
		for (int index = 0, limit = spec.length(); index < limit; index++) {
			final char p = spec.charAt(index);
			if (p == '/') {
				//$NON-NLS-1$
				break;
			}
			if (p == ':') {
				//$NON-NLS-1$
				newProtocol = spec.substring(0, index);
				break;
			}
		}
		return (newProtocol != null && newProtocol
				.compareToIgnoreCase(FILE_PROTOCOL) == 0);
	}

	/**
	 * @param url
	 * @return String
	 */
	private String getPath(URL url) {
		String ref = url.getRef() == null ? "" : "#" + url.getRef(); //$NON-NLS-1$ //$NON-NLS-2$
		String strPath = url.getFile() + ref;
		IPath path;
		if (strPath.length() == 0) {
			path = Path.ROOT;
		} else {
			path = new Path(strPath);
			String query = null;
			StringTokenizer parser = new StringTokenizer(strPath, "?"); //$NON-NLS-1$
			int tokenCount = parser.countTokens();
			if (tokenCount == 2) {
				path = new Path((String) parser.nextElement());
				query = (String) parser.nextElement();
			}
			if (query == null) {
				parser = new StringTokenizer(path.toString(), "#"); //$NON-NLS-1$
				tokenCount = parser.countTokens();
				if (tokenCount == 2) {
					path = new Path((String) parser.nextElement());
				}
			}
		}
		return getPath(path, url.getHost());
	}

	/**
	 * @param path
	 * @param host
	 * @return String
	 */
	private String getPath(IPath path, String host) {
		IPath newPath = path;
		// They are potentially for only Windows operating system.
		// a.) if path has a device, and if it begins with IPath.SEPARATOR,
		// remove it
		final String device = path.getDevice();
		if (device != null && device.length() > 0) {
			if (device.charAt(0) == IPath.SEPARATOR) {
				final String newDevice = device.substring(1);
				newPath = path.setDevice(newDevice);
			}
		}
		// b.) if it has a hostname, it is UNC name... Any java or eclipse api
		// helps it ??
		if (newPath != null && host != null && host.length() != 0) {
			IPath uncPath = new Path(host);
			uncPath = uncPath.append(path);
			newPath = uncPath.makeUNC(true);
		}
		
		if (newPath != null)
		{
		    return newPath.toString();
		}
		return path.toString();
	}

	/**
	 * Resolve the (possibly relative) URI acording to RFC1808 using the default
	 * file base location. Resolves resource references into absolute resource
	 * locations without ensuring that the resource actually exists. Note:
	 * currently resolveCrossProjectLinks is ignored in this implementation.
	 */
	public java.lang.String getLocationByURI(String uri,
			boolean resolveCrossProjectLinks) {
		return getLocationByURI(uri, getFileBaseLocation(),
				resolveCrossProjectLinks);
	}

	/**
	 * Perform the getLocationByURI action using the baseReference as the point
	 * of reference instead of the default for this resolver Note: currently
	 * resolveCrossProjectLinks is ignored in this implementation.
	 */
	public java.lang.String getLocationByURI(String uri, String baseReference,
			boolean resolveCrossProjectLinks) {
		return getLocationByURI(uri, baseReference);
	}

	public org.eclipse.core.resources.IProject getProject() {
		return _project;
	}

	public org.eclipse.core.resources.IContainer getRootLocation() {
		return _project;
	}

	private String getRootLocationString() {
		return null;
	}

	public void setFileBaseLocation(java.lang.String newFileBaseLocation) {
		_fileBaseLocation = newFileBaseLocation;
	}

	public void setProject(org.eclipse.core.resources.IProject newProject) {
		_project = newProject;
	}

	public InputStream getURIStream(String uri) {
		return null;
	}
}