/*******************************************************************************
 * Copyright (c) 2007-2009 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
 *
 * Contributor:
 *     Red Hat, Inc. - initial API and implementation
 ******************************************************************************/
package org.hibernate.eclipse.jdt.ui.wizards;

import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.StringWriter;
import java.io.UnsupportedEncodingException;
import java.lang.reflect.InvocationTargetException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
import java.util.Map.Entry;

import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.runtime.Assert;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.jdt.core.ICompilationUnit;
import org.eclipse.jdt.core.IJavaElement;
import org.eclipse.jdt.core.IJavaProject;
import org.eclipse.jdt.core.IPackageFragment;
import org.eclipse.jdt.core.IPackageFragmentRoot;
import org.eclipse.jdt.core.IType;
import org.eclipse.jdt.core.JavaModelException;
import org.eclipse.jdt.internal.core.JavaElement;
import org.eclipse.jdt.internal.core.JavaElementInfo;
import org.eclipse.jdt.internal.core.JavaProject;
import org.eclipse.jdt.internal.core.PackageFragment;
import org.eclipse.jdt.internal.core.PackageFragmentRoot;
import org.eclipse.jface.dialogs.IMessageProvider;
import org.eclipse.jface.dialogs.IPageChangingListener;
import org.eclipse.jface.dialogs.PageChangingEvent;
import org.eclipse.jface.operation.IRunnableWithProgress;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.StructuredSelection;
import org.eclipse.jface.wizard.IWizardContainer;
import org.eclipse.jface.wizard.IWizardPage;
import org.eclipse.jface.wizard.Wizard;
import org.eclipse.jface.wizard.WizardDialog;
import org.eclipse.ui.INewWizard;
import org.eclipse.ui.IWorkbench;
import org.eclipse.ui.IWorkbenchPage;
import org.eclipse.ui.PartInitException;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.dialogs.WizardNewFileCreationPage;
import org.eclipse.ui.ide.IDE;
import org.hibernate.cfg.Configuration;
import org.hibernate.console.ImageConstants;
import org.hibernate.eclipse.console.HibernateConsoleMessages;
import org.hibernate.eclipse.console.HibernateConsolePlugin;
import org.hibernate.eclipse.console.utils.EclipseImages;
import org.hibernate.eclipse.console.utils.FileUtils;
import org.hibernate.eclipse.jdt.ui.internal.JdtUiMessages;
import org.hibernate.eclipse.jdt.ui.internal.jpa.collect.AllEntitiesInfoCollector;
import org.hibernate.eclipse.jdt.ui.internal.jpa.common.EntityInfo;
import org.hibernate.eclipse.jdt.ui.internal.jpa.common.Utils;
import org.hibernate.tool.hbm2x.HibernateMappingExporter;
import org.hibernate.tool.hbm2x.HibernateMappingGlobalSettings;
import org.hibernate.tool.hbm2x.pojo.POJOClass;

/**
 * @author Dmitry Geraskov
 *
 */
@SuppressWarnings("restriction")
public class NewHibernateMappingFileWizard extends Wizard implements INewWizard, IPageChangingListener{

	/**
	 * Selected compilation units for startup processing,
	 * result of processing selection
	 */
	private Set<ICompilationUnit> selectionCU = null;

	private Map<IJavaProject, Collection<EntityInfo>> project_infos = new HashMap<IJavaProject, Collection<EntityInfo>>();

	private IStructuredSelection selection;
	// process depth of current selection
	private int processDepth = Integer.MIN_VALUE;
	
	private NewHibernateMappingElementsSelectionPage2 page0 = null;
	
	private WizardNewFileCreationPage cPage;
	
	private NewHibernateMappingFilePage page2 = null;	
	
	private NewHibernateMappingPreviewPage previewPage = null;	

	public NewHibernateMappingFileWizard(){
		setDefaultPageImageDescriptor(EclipseImages.getImageDescriptor(ImageConstants.NEW_WIZARD) );
		setNeedsProgressMonitor(true);
		setWindowTitle(JdtUiMessages.NewHibernateMappingFileWizard_create_hibernate_xml_mapping_file);
	}

	@Override
	public void addPages() {
		super.addPages();
		
		if (selection == null) {
			selection = new StructuredSelection();
		}
		
		page0 = new NewHibernateMappingElementsSelectionPage2(JdtUiMessages.NewHibernateMappingFileWizard_create_hibernate_xml_mapping_file, selection);
		page0.setTitle(JdtUiMessages.NewHibernateMappingElementsSelectionPage2_title);
		page0.setDescription(JdtUiMessages.NewHibernateMappingElementsSelectionPage2_description);
		addPage(page0);
		
		cPage = new WizardNewFileCreationPage( "Ccfgxml", selection ); //$NON-NLS-1$
	    cPage.setTitle( JdtUiMessages.NewHibernateMappingFileWizard_create_hibernate_xml_mapping_file );
	    cPage.setDescription( JdtUiMessages.NewHibernateMappingFileWizard_create_empty_xml_mapping_file );
	    cPage.setFileName("hibernate.hbm.xml"); //$NON-NLS-1$
	    addPage(cPage);	    
	    
		page2 = new NewHibernateMappingFilePage(false);
		page2.setTitle(JdtUiMessages.NewHibernateMappingFilePage_title);
		page2.setMessage(JdtUiMessages.NewHibernateMappingFilePage_this_wizard_creates, IMessageProvider.WARNING);
		addPage(page2);		

		previewPage = new NewHibernateMappingPreviewPage();
		previewPage.setTitle(JdtUiMessages.NewHibernateMappingPreviewPage_title);
		addPage(previewPage);
	}
	
	@Override
	public IWizardPage getNextPage(IWizardPage page) {
		if (page == page0 && !page0.getSelection().isEmpty()) return page2;
		if (page == cPage) return null;
		return super.getNextPage(page);
	}
	
	@Override
	public void setContainer(IWizardContainer wizardContainer) {
		if (getContainer() instanceof WizardDialog) {
			((WizardDialog) getContainer()).removePageChangingListener(this);
		}
		super.setContainer(wizardContainer);
		if (getContainer() instanceof WizardDialog) {
			((WizardDialog) getContainer()).addPageChangingListener(this);
		}
    }

	public void handlePageChanging(PageChangingEvent event) {
		if (event.getTargetPage() != previewPage) {
			// clean up changes
			previewPage.setChange(null);
		}
		if (event.getTargetPage() == page2) {
			updateCompilationUnits();
			page2.setInput(project_infos);
		} else if (event.getTargetPage() == previewPage) {
			Map<IJavaProject, IPath> places2Gen = getPlaces2Gen();
			previewPage.setPlaces2Gen(places2Gen);
		}
	}

	public void init(IWorkbench workbench, IStructuredSelection selection) {
		Set<IJavaElement> filteredElements = new HashSet<IJavaElement>();
		Object[] elements = selection.toArray();
		for (int i = 0; i < elements.length; i++) {
			if (elements[i] instanceof JavaProject) {
				JavaProject project = (JavaProject) elements[i];
				try {
					IPackageFragmentRoot[] roots = project.getPackageFragmentRoots();
					for (int j = 0; j < roots.length; j++) {
						if (!roots[j].isArchive()){
							IJavaElement[] rootChildren = roots[j].getChildren();
							for (int k = 0; k < rootChildren.length; k++) {
								if (rootChildren[k] instanceof IPackageFragment) {
									IPackageFragment pkg = (IPackageFragment) rootChildren[k];
									try {
										if (pkg.containsJavaResources())
											filteredElements.add(rootChildren[k]);
									} catch (JavaModelException e1) {
										e1.printStackTrace();
									}
								}
							}														
						}
					} 
				} catch (JavaModelException e) {
					e.printStackTrace();
				}				
			} else if (elements[i] instanceof IPackageFragmentRoot) {
				IPackageFragmentRoot root = (IPackageFragmentRoot)elements[i];
				if (!root.isArchive()) {							
					try {
						IJavaElement[] rootChildren = root.getChildren();
						for (int k = 0; k < rootChildren.length; k++) {
							if (rootChildren[k] instanceof IPackageFragment) {
								IPackageFragment pkg = (IPackageFragment) rootChildren[k];
								try {
									if (pkg.containsJavaResources())
										filteredElements.add(rootChildren[k]);
								} catch (JavaModelException e1) {
									e1.printStackTrace();
								}
							}
						}
					} catch (JavaModelException e) {
						e.printStackTrace();
					}							
				}
			} else if (elements[i] instanceof ICompilationUnit) {
				ICompilationUnit cu = (ICompilationUnit)elements[i];
				IType[] types;
				try {
					types = cu.getTypes();
					//remove java extension.
					//String typeName = cu.getElementName().substring(0, cu.getElementName().length() - 5);
					for (int j = 0; j < types.length; j++) {
						//if (types[j].getElementName().equals(typeName)){
							filteredElements.add(types[j]);
						//	break;
						//}
					}
				} catch (JavaModelException e) {
					e.printStackTrace();
				}
					
			} else if (elements[i] instanceof IJavaElement) {
				filteredElements.add((IJavaElement) elements[i]);
			}
		}
		this.selection = new StructuredSelection(filteredElements.toArray());
	}
	
	protected class HibernateMappingExporter2 extends HibernateMappingExporter {
		protected IJavaProject proj;
		public HibernateMappingExporter2(IJavaProject proj, Configuration cfg, File outputdir) {
	    	super(cfg, outputdir);
	    	this.proj = proj;
	    }
		/**
		 * redefine base exportPOJO to setup right output dir in case 
		 * of several source folders 
		 */
		@SuppressWarnings("unchecked")
		@Override
		protected void exportPOJO(Map additionalContext, POJOClass element) {
			File outputdir4FileOld = getOutputDirectory();
			File outputdir4FileNew = outputdir4FileOld;
			String fullyQualifiedName = element.getQualifiedDeclarationName();
			ICompilationUnit icu = Utils.findCompilationUnit(proj, fullyQualifiedName);
			if (icu != null) {
				IResource resource = null;
				try {
					resource = icu.getCorrespondingResource();
				} catch (JavaModelException e) {
					//ignore
				}
				String[] aFQName = fullyQualifiedName.split("\\."); //$NON-NLS-1$
				int n = aFQName.length - 1;
				for ( ; n >= 0 && resource != null; n--) {
					if (n == 0 && aFQName[n].length() == 0) {
						// handle the (default package) case
						break;
					}
					resource = resource.getParent();
				}
				if (resource != null) {
					final IPath projPath = proj.getResource().getLocation();
					IPath place2Gen = previewPage.getRootPlace2Gen().append(proj.getElementName());
					//
					IPath tmpPath = resource.getLocation();
					tmpPath = tmpPath.makeRelativeTo(projPath);
					place2Gen = place2Gen.append(tmpPath);
					outputdir4FileNew = place2Gen.toFile();
				}
			}
			if (!outputdir4FileNew.exists()) {
				outputdir4FileNew.mkdirs();
			}
			setOutputDirectory(outputdir4FileNew);
			super.exportPOJO(additionalContext, element);
			setOutputDirectory(outputdir4FileOld);
		}
	}

	protected Map<IJavaProject, IPath> getPlaces2Gen() {
		updateCompilationUnits();
		Map<IJavaProject, Configuration> configs = createConfigurations();
		Map<IJavaProject, IPath> places2Gen = new HashMap<IJavaProject, IPath>();
		for (Entry<IJavaProject, Configuration> entry : configs.entrySet()) {
			Configuration config = entry.getValue();
			HibernateMappingGlobalSettings hmgs = new HibernateMappingGlobalSettings();

			//final IPath projPath = entry.getKey().getProject().getLocation();
			IPath place2Gen = previewPage.getRootPlace2Gen().append(entry.getKey().getElementName());
			places2Gen.put(entry.getKey(), place2Gen);
			
			File folder2Gen = new File(place2Gen.toOSString());
			FileUtils.delete(folder2Gen); // cleanup folder before gen info
			if (!folder2Gen.exists()) {
				folder2Gen.mkdirs();
			}
			HibernateMappingExporter2 hce = new HibernateMappingExporter2(
					entry.getKey(), config, folder2Gen);

			hce.setGlobalSettings(hmgs);
			//hce.setForEach("entity");
			//hce.setFilePattern(file.getName());
			try {
				hce.start();
			} catch (Exception e){
				HibernateConsolePlugin.getDefault().log(e);
			}
		}
		return places2Gen;
	}

	protected void cleanUpGenFolders() {
		Set<IJavaProject> projs = previewPage.getJavaProjects();
		for (IJavaProject proj : projs) {
			// cleanup gen folder
			//final IPath projPath = proj.getProject().getLocation();
			IPath place2Gen = previewPage.getRootPlace2Gen().append(proj.getElementName());
			File folder2Gen = new File(place2Gen.toOSString());
			FileUtils.delete(folder2Gen);
		}
	}

	@Override
	public boolean performCancel() {
		cleanUpGenFolders();
        return super.performCancel();
    }

	@Override
	public boolean performFinish() {
		boolean res = true;
		if (page0.getSelection().isEmpty()){
			final IFile file = cPage.createNewFile();
			IRunnableWithProgress op = new IRunnableWithProgress() {
				public void run(IProgressMonitor monitor) throws InvocationTargetException {
					try {
						doFinish(file, monitor);
					} catch (CoreException e) {
						throw new InvocationTargetException(e);
					} finally {
						monitor.done();
					}
				}
			};
			try {
				getContainer().run(true, false, op);
			} catch (InterruptedException e) {
				res = false;
			} catch (InvocationTargetException e) {
				Throwable realException = e.getTargetException();
				HibernateConsolePlugin.getDefault().showError(getShell(), HibernateConsoleMessages.NewReverseEngineeringFileWizard_error, realException);
				res = false;
			}
			cleanUpGenFolders();
		} else {
			if (previewPage.getChange() == null) {
				Map<IJavaProject, IPath> places2Gen = getPlaces2Gen();
				previewPage.setPlaces2Gen(places2Gen);
			}
			previewPage.performFinish();
			// refresh
			Set<IJavaProject> projs = previewPage.getJavaProjects();
			for (IJavaProject proj : projs) {
				try {
					IPackageFragmentRoot[] pfRoots = proj.getPackageFragmentRoots();
					for (int i = 0; i < pfRoots.length; i++) {
						IResource container = pfRoots[i].getResource();
						if (container != null && container.getType() != IResource.FILE) {
							container.refreshLocal(IResource.DEPTH_INFINITE, null);
						}
					}
				} catch (JavaModelException e) {
					HibernateConsolePlugin.getDefault().log(e);
				} catch (CoreException e) {
					HibernateConsolePlugin.getDefault().log(e);
				}
			}
			cleanUpGenFolders();
		}		
		return res;
	}
	
    /**
	 * The worker method. It will find the container, create the
	 * file if missing or just replace its contents, and open
	 * the editor on the newly created file.
     * @param file
     * @param props
	 */

	private void doFinish(
		final IFile file, IProgressMonitor monitor)
		throws CoreException {
		// create a sample file
		monitor.beginTask(HibernateConsoleMessages.NewReverseEngineeringFileWizard_creating + file.getName(), 2);
		InputStream stream = null;
		try {
			stream = openContentStream();
			if (file.exists() ) {
                file.setContents(stream, true, true, monitor);
			} else {
				file.create(stream, true, monitor);
			}
		} finally {
			if (stream != null) {
				try {
					stream.close();
				} catch (IOException e) {
					// ignore
				}
			}
		}
		monitor.worked(1);
		monitor.setTaskName(HibernateConsoleMessages.NewConfigurationWizard_open_file_for_editing);
		getShell().getDisplay().asyncExec(new Runnable() {
			public void run() {
				IWorkbenchPage page =
					PlatformUI.getWorkbench().getActiveWorkbenchWindow().getActivePage();
				try {
					IDE.openEditor(page, file, true);
				} catch (PartInitException e) {
					HibernateConsolePlugin.getDefault().log(e);
				}
			}
		});
		monitor.worked(1);
	}

	private InputStream openContentStream() {
        StringWriter sw = new StringWriter();
        sw.write("<?xml version=\"1.0\" encoding=\"UTF-8\"?>\r\n" +  //$NON-NLS-1$
        		"<!DOCTYPE hibernate-mapping PUBLIC \"-//Hibernate/Hibernate Mapping DTD 3.0//EN\" \"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd\" >\r\n" +  //$NON-NLS-1$
        		"<hibernate-mapping>\r\n</hibernate-mapping>"); //$NON-NLS-1$
		try {
            return new ByteArrayInputStream(sw.toString().getBytes("UTF-8") ); //$NON-NLS-1$
        } catch (UnsupportedEncodingException uec) {
            HibernateConsolePlugin.getDefault().logErrorMessage(HibernateConsoleMessages.NewConfigurationWizard_problems_converting_to_utf8, uec);
            return new ByteArrayInputStream(sw.toString().getBytes() );
        }
	}
	
	protected void initEntitiesInfo(){
		if (selectionCU.size() == 0) {
			return;
		}
		AllEntitiesInfoCollector collector = new AllEntitiesInfoCollector();
		Iterator<ICompilationUnit> it = selectionCU.iterator();

		Map<IJavaProject, Set<ICompilationUnit>> mapJP_CUSet =
			new HashMap<IJavaProject, Set<ICompilationUnit>>();
		//separate by parent project
		while (it.hasNext()) {
			ICompilationUnit cu = it.next();
			Set<ICompilationUnit> set = mapJP_CUSet.get(cu.getJavaProject());
			if (set == null) {
				set = new HashSet<ICompilationUnit>();
				mapJP_CUSet.put(cu.getJavaProject(), set);
			}
			set.add(cu);
		}
		Iterator<Map.Entry<IJavaProject, Set<ICompilationUnit>>>
		mapIt = mapJP_CUSet.entrySet().iterator();
		while (mapIt.hasNext()) {
			Map.Entry<IJavaProject, Set<ICompilationUnit>>
			entry = mapIt.next();
			IJavaProject javaProject = entry.getKey();
			Iterator<ICompilationUnit> setIt = entry.getValue().iterator();
			collector.initCollector();
			while (setIt.hasNext()) {
				ICompilationUnit icu = setIt.next();
				collector.collect(icu, processDepth);
			}
			collector.resolveRelations();
			Collection<EntityInfo> c = new ArrayList<EntityInfo>();
			for (Iterator<EntityInfo> i = collector.getMapCUs_Info().values().iterator();
						i.hasNext();) {
				c.add(i.next());				
			}
			project_infos.put(javaProject, c);

		}
	}

	protected void processJavaElements(Object obj, int depth) {
		if (depth < 0) {
			return;
		}
		try {
			if (obj instanceof ICompilationUnit) {
				ICompilationUnit cu = (ICompilationUnit) obj;
				selectionCU.add(cu);
			} else if (obj instanceof JavaProject && depth > 0) {
				JavaProject javaProject = (JavaProject) obj;
				IPackageFragmentRoot[] pfr = javaProject.getAllPackageFragmentRoots();
				for (IPackageFragmentRoot element : pfr) {
					processJavaElements(element, depth - 1);
				}
			} else if (obj instanceof PackageFragment) {
				PackageFragment packageFragment = (PackageFragment) obj;
				ICompilationUnit[] cus = packageFragment.getCompilationUnits();
				for (ICompilationUnit cu : cus) {
					selectionCU.add(cu);
				}
			} else if (obj instanceof PackageFragmentRoot && depth > 0) {
				JavaElement javaElement = (JavaElement) obj;
				JavaElementInfo javaElementInfo = (JavaElementInfo) javaElement.getElementInfo();
				IJavaElement[] je = javaElementInfo.getChildren();
				for (IJavaElement element : je) {
					processJavaElements(element, depth - 1);
				}
			} else if (obj instanceof JavaElement) {
				JavaElement javaElement = (JavaElement) obj;
				ICompilationUnit cu = javaElement.getCompilationUnit();
				selectionCU.add(cu);
			}
		} catch (JavaModelException e) {
			// just ignore it!
			//HibernateConsolePlugin.getDefault().logErrorMessage("JavaModelException: ", e); //$NON-NLS-1$
		}
	}
	

	protected Map<IJavaProject, Configuration> createConfigurations() {
		ConfigurationActor actor = new ConfigurationActor(selectionCU);
		Map<IJavaProject, Configuration> configs = actor.createConfigurations(processDepth);
		return configs;
	}
	
	protected void updateCompilationUnits(){
		Assert.isNotNull(page0.getSelection(), JdtUiMessages.NewHibernateMappingFileWizard_selection_cant_be_empty);
		if ((selectionCU == null) || !page0.getSelection().equals(selection) || 
				processDepth != page0.getProcessDepth()) {
			selectionCU = new HashSet<ICompilationUnit>();
			project_infos.clear();
			selection = page0.getSelection();
			processDepth = page0.getProcessDepth();
			try {
				getContainer().run(false, false, new IRunnableWithProgress() {

					public void run(IProgressMonitor monitor)
							throws InvocationTargetException,
							InterruptedException {
						monitor.beginTask(JdtUiMessages.NewHibernateMappingFileWizard_look_for_dependent_cu, selection.size() + 1);
						Iterator<?> it = selection.iterator();
						int done = 1;
						while (it.hasNext()) {
							Object obj = it.next();
							processJavaElements(obj, processDepth);
							monitor.worked(done++);
						}
						initEntitiesInfo();
						monitor.worked(1);
						monitor.done();
					}
				});
			} catch (InvocationTargetException e) {
				HibernateConsolePlugin.getDefault().log(e);
			} catch (InterruptedException e) {
				HibernateConsolePlugin.getDefault().log(e);
			}
		}
	}
	
	@Override
	public boolean canFinish() {
		return !page0.getSelection().isEmpty() || cPage.isPageComplete();
	}
}
