/*******************************************************************************
 * Copyright (c) 2005, 2008 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
 *     Stefan Dimov, stefan.dimov@sap.com - bug 207826
 *******************************************************************************/
package org.eclipse.jst.j2ee.internal;

import java.io.File;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.eclipse.core.resources.IContainer;
import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.IWorkspaceRoot;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.Path;
import org.eclipse.jdt.core.JavaCore;
import org.eclipse.jem.util.logger.proxy.Logger;
import org.eclipse.jface.viewers.ILabelProviderListener;
import org.eclipse.jface.viewers.IStructuredContentProvider;
import org.eclipse.jface.viewers.ITableLabelProvider;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.jst.j2ee.application.internal.operations.ClassPathSelection;
import org.eclipse.jst.j2ee.classpathdep.ClasspathDependencyUtil;
import org.eclipse.jst.j2ee.classpathdep.IClasspathDependencyConstants;
import org.eclipse.jst.j2ee.componentcore.J2EEModuleVirtualComponent;
import org.eclipse.jst.j2ee.internal.common.J2EEVersionUtil;
import org.eclipse.jst.j2ee.internal.project.J2EEProjectUtilities;
import org.eclipse.jst.j2ee.model.IEARModelProvider;
import org.eclipse.jst.j2ee.model.IModelProvider;
import org.eclipse.jst.j2ee.model.ModelProviderManager;
import org.eclipse.jst.j2ee.project.JavaEEProjectUtilities;
import org.eclipse.jst.javaee.application.Application;
import org.eclipse.swt.graphics.Image;
import org.eclipse.wst.common.componentcore.ComponentCore;
import org.eclipse.wst.common.componentcore.ModuleCoreNature;
import org.eclipse.wst.common.componentcore.internal.resources.VirtualArchiveComponent;
import org.eclipse.wst.common.componentcore.resources.IVirtualComponent;
import org.eclipse.wst.common.componentcore.resources.IVirtualReference;

public class AvailableJ2EEComponentsForEARContentProvider implements IStructuredContentProvider, ITableLabelProvider {
	
	final static String PATH_SEPARATOR = String.valueOf(IPath.SEPARATOR);
	private final static int COMPONENT_NUM_OF_SEGMENTS = 1;
	
	private int j2eeVersion;
	private IVirtualComponent earComponent;
	private boolean isEE5 = false;
	private String libDir = null;
	
	
	public AvailableJ2EEComponentsForEARContentProvider(IVirtualComponent aEarComponent, int j2eeVersion) {
		super();
		this.j2eeVersion = j2eeVersion;
		earComponent = aEarComponent;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.jface.viewers.IStructuredContentProvider#getElements(java.lang.Object)
	 */
	public Object[] getElements(Object inputElement) {
		if (null != earComponent){
			isEE5 = J2EEProjectUtilities.isJEEProject(earComponent.getProject());
		}
		Object[] empty = new Object[0];
		if (!(inputElement instanceof IWorkspaceRoot))
			return empty;
		IProject[] projects = ((IWorkspaceRoot) inputElement).getProjects();
		if (projects == null || projects.length == 0)
			return empty;
		List validCompList = new ArrayList();
		Map pathToComp = new HashMap();
		for (int i = 0; i < projects.length; i++) {
			// get flexible project
			IProject project = projects[i];
			if(ModuleCoreNature.isFlexibleProject(project)){
				IVirtualComponent component = ComponentCore.createComponent(project);
				if (J2EEProjectUtilities.isApplicationClientProject(project) ||
						J2EEProjectUtilities.isEJBProject(project) ||
						J2EEProjectUtilities.isDynamicWebProject(project) ||
						J2EEProjectUtilities.isJCAProject(project) ||
						J2EEProjectUtilities.isUtilityProject(project) ){
					int compJ2EEVersion = J2EEVersionUtil.convertVersionStringToInt(component);
					if( compJ2EEVersion <= j2eeVersion){
						validCompList.add(component);
					} else if(isEE5){
						validCompList.add(component);
					}
				}else if(null != earComponent && J2EEProjectUtilities.isEARProject(project)){
					//find the ArchiveComponent
					if (component.equals( earComponent )) {
						if (isEE5) {
							String earDDVersion = JavaEEProjectUtilities.getJ2EEDDProjectVersion(project);
							boolean isDDVersion5 = earDDVersion.equals(J2EEVersionConstants.VERSION_5_0_TEXT) ? true : false;
							if (isDDVersion5) {
								Application app = (Application)ModelProviderManager.getModelProvider(project).getModelObject();
								if (libDir == null)
									libDir = app.getLibraryDirectory();
								if (libDir == null)
									libDir = J2EEConstants.EAR_DEFAULT_LIB_DIR;
							}
						}
						IVirtualReference[] newrefs = component.getReferences();
						for( int k=0; k< newrefs.length; k++ ){
							IVirtualReference tmpref = newrefs[k];
							IVirtualComponent referencedcomp = tmpref.getReferencedComponent();		
							boolean isBinary = referencedcomp.isBinary();
							if( isBinary ){
								if (shouldShow(referencedcomp))
									validCompList.add(referencedcomp);
							} else {
								addClasspathComponentDependencies(validCompList, pathToComp, referencedcomp);
							}
						}	
					}
				}
			} else
				try {
					if (project.exists() && project.isAccessible() && project.hasNature("org.eclipse.jdt.core.javanature") ){ //$NON-NLS-1$
						if( !project.getName().startsWith(".") ) //$NON-NLS-1$
							validCompList.add(project);
					}
				} catch (CoreException e) {
					Logger.getLogger().log(e);
				}
		}
		return validCompList.toArray();
	}
	
	public void setCurrentLibDir(String libDir) {
		this.libDir = libDir;
	}
	
	private boolean shouldShow(IVirtualComponent component) {
		IPath p = null;
		
		if (!(component instanceof VirtualArchiveComponent)) 
			return true;
		
		VirtualArchiveComponent comp = (VirtualArchiveComponent)component;
		
		// The ear of the component must be the same as the ear's local variable 
		if(!comp.getProject().getName().equals(earComponent.getName()))
			return false;
		
		//if the workspace relative path is null then it can mean that the file is not in the workspace or that the file doesn't exist.  
		if (getComponentWorkspaceRelativePath(comp) != null){
			try {
				p = getComponentProjectRelativePath(comp);
			} catch (IllegalArgumentException e) {
				return false;
			}
		}else{
			// Determine if archive is a lib archive or a variable
			if (comp.getArchiveType().equals(VirtualArchiveComponent.LIBARCHIVETYPE)){
			
			// Check if component's name describes an absolute path, meaning that the file is outside workspace
			Path bPath = new Path(component.getName().substring(4));
			File bFile = bPath.toFile();
			if(bFile.exists())
				return true;
			}else if (comp.getArchiveType().equals(VirtualArchiveComponent.VARARCHIVETYPE)){
				
				IPath resolvedPath= JavaCore.getResolvedVariablePath(new Path(component.getName().substring(4)));
				java.io.File file = new java.io.File(resolvedPath.toOSString());
				if( file.isFile() && file.exists())
					return true;
			}
		}
		
		// If the path relative to the project is null it means that the file doesn't exist, component shouldn't be shown.
		if (p == null)
			return false;
		
		// Get the content directory
		IContainer contentDir  = earComponent.getRootFolder().getUnderlyingFolder();
		// Obtain the number of segments of the content directory
		int ContentDirSegmentCount = contentDir.getProjectRelativePath().segmentCount();
		// Sum the content directory number of segments plus the number of segments that represent the component (should be only one)
		int numOfSegmentsToCompare = ContentDirSegmentCount + COMPONENT_NUM_OF_SEGMENTS;
		
		// If the EAR has a content folder, check if the project relative path starts with it, if not do not show.
		if ((ContentDirSegmentCount > 0) && !startWithSameSegments(p, contentDir.getProjectRelativePath()))
			return false;
		
		// At this point we know that the resource is inside the ear, now if it is anywhere 
		// outside the lib dir we must show it (we'll take care of the ones that are in the lib dir later)
		if (!startWithSameSegments(p, Path.fromOSString(contentDir.getProjectRelativePath().toString() + IPath.SEPARATOR + libDir)))
			return true;
		
		// Show the element if it is in the EAR's root folder. If the EAR has a content folder, the number of segments will be "content folder segments" + "component name's segment"
		// If the EAR does not have content folder, the number of segments will be 1 (the component name only) 
		if (p.segmentCount() == numOfSegmentsToCompare)
			return true;
		
		if (isEE5) {
			// Obtain libDir, remove leading and ending unnecessary characters and split into segments
			String strippedLibDir = stripSeparators(libDir);
			String[] libDirSegs = strippedLibDir.split(PATH_SEPARATOR);
			// Verify if lib dir segments' number match
			if (p.segmentCount() - numOfSegmentsToCompare != libDirSegs.length)
				return false;
			// Verify if lib dir segments' values match
			for (int i = 0; i < libDirSegs.length; i++)
				if (!libDirSegs[i].equals(p.segment(i + ContentDirSegmentCount))) // If the EAR has no content folder, offset will be 0
					return false;
			return true;
		}
		return false;
	}
	
	/* This method only calls the getWorkspaceRelativePath of a VirtualArchiveComponent which is now deprecated, it returns inconsistent
	 * values so needed shielding against those inconsistencies is needed.
	 */
	private IPath getComponentWorkspaceRelativePath(VirtualArchiveComponent component){
		
		if(component.getWorkspaceRelativePath() != null){
			// Get segments of component's IPath
			return component.getWorkspaceRelativePath();
		}else{
			IFile aFile = ResourcesPlugin.getWorkspace().getRoot().getFile(new Path(component.getProject().getName() + IPath.SEPARATOR + component.getName().substring(4)));
			
			// First logic expression: workspace relative path will be null only if file doesn't exist or the path  has not more than one segment (is in root of workpsace)
			if( aFile == null || ( aFile != null && !aFile.exists()) )
					return null;
			else
				return aFile.getFullPath();
		}
	}
	// This method replaces the getProjectRelativePath method of the VirtualArchiveComponent which is now deprecated, it adds some shielding. 
	private IPath getComponentProjectRelativePath(VirtualArchiveComponent component){
		IPath CompWorkspaceRelPath = getComponentWorkspaceRelativePath(component);
	
		if (CompWorkspaceRelPath != null){
			IFile aFile = ResourcesPlugin.getWorkspace().getRoot().getFile(CompWorkspaceRelPath);
			if (aFile.exists())
				return aFile.getProjectRelativePath();
		}
		
		return null;
	}
	
	// This method determines if the provided IPaths start with the same segments 
	private boolean startWithSameSegments(IPath iPath1, IPath iPath2){
		
		// Validate the provided paths
		if (iPath1 == null || iPath2 == null)
			return false;
			
		// Determine which one of the paths is shorter, if equal then doesn't matter. 
		int minor = iPath1.segmentCount() > iPath2.segmentCount() ? iPath2.segmentCount() : iPath1.segmentCount();  
		// Compares "minor" amount of segments
		for (int i = 0; i < minor; i++){
			if (!iPath1.segment(i).equals(iPath2.segment(i)))
				return false;
		}
		return true;
	}
	
	private String stripSeparators(String dir) {
		if (dir.startsWith(PATH_SEPARATOR)) 
			dir = dir.substring(1);
		if (dir.endsWith(PATH_SEPARATOR))  
			dir = dir.substring(0, dir.length() - 1);
		return dir;
	}	

	public static void addClasspathComponentDependencies(final List componentList, final Map pathToComp, final IVirtualComponent referencedComponent) {
		if (referencedComponent instanceof J2EEModuleVirtualComponent) {
			J2EEModuleVirtualComponent j2eeComp = (J2EEModuleVirtualComponent) referencedComponent;
			IVirtualReference[] cpRefs = j2eeComp.getJavaClasspathReferences();
			for (int j=0; j < cpRefs.length; j++) {
				String unresolvedURI = null;
				// only ../ mappings supported at this level
				if (!cpRefs[j].getRuntimePath().equals(IClasspathDependencyConstants.RUNTIME_MAPPING_INTO_CONTAINER_PATH)) {
					continue;
				}
				// if the absolute path for this component already has a mapping, skip (the comp might be contributed by more than
				// one child module)
				final IPath path = ClasspathDependencyUtil.getClasspathVirtualReferenceLocation(cpRefs[j]);
				final IVirtualComponent comp = (IVirtualComponent) pathToComp.get(path);
				if (comp != null) {
					// replace with a temp VirtualArchiveComponent whose IProject is set to a new pseudo name that is
					// the concatenation of all project contributions for that archive
					if (comp instanceof VirtualArchiveComponent) {
						final VirtualArchiveComponent oldComp = (VirtualArchiveComponent) comp;
						componentList.remove(comp);
						final VirtualArchiveComponent newComponent = ClassPathSelection.updateDisplayVirtualArchiveComponent(oldComp, cpRefs[j]);
						pathToComp.put(path, newComponent);
						componentList.add(newComponent);
					}
					continue;
				} else {
					pathToComp.put(path, cpRefs[j].getReferencedComponent());
				}
				componentList.add(cpRefs[j].getReferencedComponent());
			}
		}
	}
	
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.jface.viewers.ITableLabelProvider#getColumnImage(java.lang.Object, int)
	 */
	public Image getColumnImage(Object element, int columnIndex) {
		return null;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.jface.viewers.ITableLabelProvider#getColumnText(java.lang.Object, int)
	 */
	public String getColumnText(Object element, int columnIndex) {
		if (element instanceof IVirtualComponent) {
			IVirtualComponent comp = (IVirtualComponent)element;
			String name = ""; //$NON-NLS-1$
			if( columnIndex == 0 ){
				if (ClasspathDependencyUtil.isClasspathComponentDependency(comp)) {
					return ClasspathDependencyUtil.getClasspathComponentDependencyDisplayString(comp);
				}
				IModelProvider provider = ModelProviderManager.getModelProvider(earComponent.getProject());
				if (provider instanceof IEARModelProvider)
				{
					name = ((IEARModelProvider)provider).getModuleURI(comp);
					//name will be null if it has not yet been added to the EAR
					//both component projects will be equal when adding jars, external jars, or variables.
					if(name == null && earComponent.getProject().equals(comp.getProject())){
						name = comp.getName();
						if(name != null){ 
							//strip off everything but last segment to avoid confusion so instead of 
							//displaying 'lib/c:\temp\foo.jar' to the user, the user will see 'foo.jar'
							//which is exactly what will be displayed the second time the user opens the page
							IPath path = new Path(name);
							name = path.lastSegment();
						}
					}
				}
				
				if( name == null || name == "" ){ //$NON-NLS-1$
					name = comp.getName();
				}
				return name;
			} else if (columnIndex == 1) {
				return comp.getProject().getName();
			} else if (columnIndex == 2) {
				return ""; //$NON-NLS-1$
			}
		} else if (element instanceof IProject){
			if (columnIndex != 2) {
				return ((IProject)element).getName();
			} else {
				return ""; //$NON-NLS-1$
			}
		}		
		return null;
	}	
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.jface.viewers.IContentProvider#inputChanged(org.eclipse.jface.viewers.Viewer,
	 *      java.lang.Object, java.lang.Object)
	 */
	public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
		//do nothing
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.jface.viewers.IBaseLabelProvider#addListener(org.eclipse.jface.viewers.ILabelProviderListener)
	 */
	public void addListener(ILabelProviderListener listener) {
		//do nothing
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.jface.viewers.IBaseLabelProvider#isLabelProperty(java.lang.Object,
	 *      java.lang.String)
	 */
	public boolean isLabelProperty(Object element, String property) {
		return false;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.jface.viewers.IBaseLabelProvider#removeListener(org.eclipse.jface.viewers.ILabelProviderListener)
	 */
	public void removeListener(ILabelProviderListener listener) {
		//do nothing
	}

	/* (non-Javadoc)
	 * @see org.eclipse.jface.viewers.IContentProvider#dispose()
	 */
	public void dispose() {
	}
}