/*******************************************************************************
 * Copyright (c) 2003, 2005 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.jst.common.jdt.internal.integration.ui;


import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;

import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.jdt.core.IClassFile;
import org.eclipse.jdt.core.ICompilationUnit;
import org.eclipse.jdt.core.IJavaElement;
import org.eclipse.jdt.core.JavaModelException;
import org.eclipse.jdt.internal.ui.JavaPlugin;
import org.eclipse.jdt.internal.ui.javaeditor.ICompilationUnitDocumentProvider;
import org.eclipse.jdt.internal.ui.javaeditor.InternalClassFileEditorInput;
import org.eclipse.jdt.ui.IWorkingCopyManager;
import org.eclipse.jdt.ui.JavaUI;
import org.eclipse.jem.util.logger.proxy.Logger;
import org.eclipse.jface.text.IDocument;
import org.eclipse.jface.text.source.IAnnotationModel;
import org.eclipse.jst.common.jdt.internal.integration.WTPWorkingCopyManager;
import org.eclipse.swt.widgets.Display;
import org.eclipse.ui.IEditorInput;
import org.eclipse.ui.IFileEditorInput;
import org.eclipse.ui.IWorkbenchWindow;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.part.FileEditorInput;
import org.eclipse.ui.texteditor.AbstractMarkerAnnotationModel;
import org.eclipse.ui.texteditor.IDocumentProvider;
import org.eclipse.wst.common.frameworks.internal.SaveFailedException;
import org.eclipse.wst.common.frameworks.internal.plugin.WTPCommonPlugin;

/**
 * Insert the type's description here. Creation date: (4/25/2001 7:05:36 PM)
 * 
 * @author: Administrator
 */
public class WTPUIWorkingCopyManager extends WTPWorkingCopyManager {
	private IWorkingCopyManager javaWorkingCopyManager;
	private ICompilationUnitDocumentProvider cuDocumentProvider;
	private HashMap editorInputs;
	private CoreException lastError;

	/**
	 * WTPUIWorkingCopyManager constructor comment.
	 */
	public WTPUIWorkingCopyManager() {
		super();
		cuDocumentProvider = JavaPlugin.getDefault().getCompilationUnitDocumentProvider();
		javaWorkingCopyManager = JavaUI.getWorkingCopyManager();
	}

	protected void syncConnect(final IEditorInput input, final ICompilationUnit cu) throws CoreException {
		Display d = Display.getCurrent();
		if (d != null) {
			lastError = null;
			d.syncExec(new Runnable() {
				public void run() {
					try {
						connect(input, cu);
					} catch (CoreException e) {
						lastError = e;
					}
				}
			});
		} else
			connect(input, cu);
		if (lastError != null)
			throw lastError;
	}

	/**
	 * Connect the CompilationUnitDocumentProvider to the
	 * 
	 * @input and connect the annotation model from the provider to the IDocument of the
	 * @input.
	 */
	protected void connect(IEditorInput input, ICompilationUnit cu) throws CoreException {
		if (input != null) {
			javaWorkingCopyManager.connect(input);
			getEditorInputs().put(cu, input);
			IDocument doc = cuDocumentProvider.getDocument(input);
			cuDocumentProvider.getAnnotationModel(input).connect(doc);
		}
	}

	protected void revertWorkingCopies() {
		if (getEditorInputs().isEmpty())
			return;
		Iterator it = getEditorInputs().values().iterator();
		IEditorInput input;
		while (it.hasNext()) {
			input = (IEditorInput) it.next();
			revert(input);
		}
	}

	/**
	 * Disonnect the CompilationUnitDocumentProvider from the
	 * 
	 * @input and disconnect the annotation model from the provider from the IDocument of the
	 * @input.
	 */
	protected void disconnect(IEditorInput input) {
		IDocument doc = cuDocumentProvider.getDocument(input);
		cuDocumentProvider.getAnnotationModel(input).disconnect(doc);
		javaWorkingCopyManager.disconnect(input);
	}

	protected void revert(IEditorInput input) {
		try {
			cuDocumentProvider.resetDocument(input);
		} catch (CoreException e) {
			Logger.getLogger().logError(e);
		}
		IDocument doc = cuDocumentProvider.getDocument(input);
		IAnnotationModel model = cuDocumentProvider.getAnnotationModel(input);

		if (model instanceof AbstractMarkerAnnotationModel) {
			AbstractMarkerAnnotationModel markerModel = (AbstractMarkerAnnotationModel) model;
			markerModel.resetMarkers();
		}
		model.disconnect(doc);
		javaWorkingCopyManager.disconnect(input);
	}

	protected void disconnectEditorInputs() {
		Iterator it = getEditorInputs().values().iterator();
		IEditorInput input;
		while (it.hasNext()) {
			input = (IEditorInput) it.next();
			disconnect(input);
		}
	}

	protected void discardExistingCompilationUnits() {
		if (getEditorInputs().isEmpty())
			return;
		Iterator it = getEditorInputs().values().iterator();
		IEditorInput input;
		while (it.hasNext()) {
			input = (IEditorInput) it.next();
			disconnect(input);
		}
	}

	public Set getAffectedFiles() {
		Set aSet = new HashSet();
		Iterator it = getEditorInputs().keySet().iterator();
		ICompilationUnit unit = null;
		IResource resource = null;
		while (it.hasNext()) {
			unit = (ICompilationUnit) it.next();
			if (isDirty(unit)) {
				try {
					resource = unit.getUnderlyingResource();
				} catch (JavaModelException ignore) {
					continue;
				}
				if (resource instanceof IFile)
					aSet.add(resource);
			}
		}
		return aSet;
	}

	protected IEditorInput getEditorInput(ICompilationUnit cu) {
		IEditorInput input = primGetEditorInput(cu);
		if (input == null) {
			try {
				input = getEditorInput((IJavaElement) cu);
			} catch (JavaModelException e) {
				//Ignore
			}
		}
		return input;
	}

	protected IEditorInput getEditorInput(IJavaElement element) throws JavaModelException {
		while (element != null) {
			switch (element.getElementType()) {
				case IJavaElement.COMPILATION_UNIT : {
					ICompilationUnit cu = (ICompilationUnit) element;
					if (cu.isWorkingCopy())
						cu = cu.getPrimary();
					IResource resource = cu.getUnderlyingResource();
					if (resource.getType() == IResource.FILE)
						return new FileEditorInput((IFile) resource);
					break;
				}
				case IJavaElement.CLASS_FILE :
					return new InternalClassFileEditorInput((IClassFile) element);
			}
			element = element.getParent();
		}
		return null;
	}

	/**
	 * Insert the method's description here. Creation date: (4/25/2001 7:30:20 PM)
	 * 
	 * @return java.util.HashMap
	 */
	protected java.util.HashMap getEditorInputs() {
		if (editorInputs == null)
			editorInputs = new HashMap(20);
		return editorInputs;
	}

	/**
	 * Returns the working copy remembered for the compilation unit encoded in the given editor
	 * input. Does not connect the edit model to the working copy.
	 * 
	 * @param input
	 *            ICompilationUnit
	 * @return the working copy of the compilation unit, or <code>null</code> if the input does
	 *         not encode an editor input, or if there is no remembered working copy for this
	 *         compilation unit
	 */
	public org.eclipse.jdt.core.ICompilationUnit getExistingWorkingCopy(ICompilationUnit cu) throws CoreException {
		if (cu == null || cu.isWorkingCopy()) {
			return cu;
		}
		ICompilationUnit newCU = super.getExistingWorkingCopy(cu);
		if (newCU != null)
			return newCU;
		IEditorInput editorInput = getEditorInput(cu);
		return javaWorkingCopyManager.getWorkingCopy(editorInput);
	}

	/**
	 * Returns the working copy remembered for the compilation unit.
	 * 
	 * @param input
	 *            ICompilationUnit
	 * @return the working copy of the compilation unit, or <code>null</code> if there is no
	 *         remembered working copy for this compilation unit
	 */
	public org.eclipse.jdt.core.ICompilationUnit getWorkingCopy(ICompilationUnit cu, boolean forNewCU) throws org.eclipse.core.runtime.CoreException {
		if (forNewCU)
			return super.getWorkingCopy(cu, forNewCU);
		return primGetWorkingCopy(cu);
	}

	public boolean isDirty(ICompilationUnit cu) {
		if (cu == null)
			return false;
		IDocumentProvider p = cuDocumentProvider;
		return p == null ? false : p.canSaveDocument(getEditorInput(cu));
	}

	/**
	 * mustSaveDocument method comment.
	 */
	public boolean isSaveNeeded() {
		Iterator it = getEditorInputs().entrySet().iterator();
		while (it.hasNext()) {
			if (cuDocumentProvider.mustSaveDocument(it.next()))
				return true;
		}
		return false;
	}

	protected void primDispose() {
		super.primDispose();
		discardExistingCompilationUnits();
		editorInputs = null;
		javaWorkingCopyManager = null;
	}

	protected void primRevert() {
		super.primRevert();
		revertWorkingCopies();
		editorInputs = null;
		javaWorkingCopyManager = null;
	}

	protected IEditorInput primGetEditorInput(ICompilationUnit cu) {
		return (IEditorInput) getEditorInputs().get(cu);
	}

	/**
	 * Returns the working copy remembered for the compilation unit encoded in the given editor
	 * input.
	 * 
	 * @param input
	 *            ICompilationUnit
	 * @return the working copy of the compilation unit, or <code>null</code> if the input does
	 *         not encode an editor input, or if there is no remembered working copy for this
	 *         compilation unit
	 */
	protected org.eclipse.jdt.core.ICompilationUnit primGetWorkingCopy(ICompilationUnit cu) throws CoreException {
		if (cu == null) {
			return cu;
		}
		ICompilationUnit primary = cu.getPrimary();
		ICompilationUnit newCU = getNewCompilationUnitWorkingCopy(primary);
		if (newCU != null)
			return newCU;
		IEditorInput editorInput = primGetEditorInput(primary);
		if (editorInput == null) {
			editorInput = getEditorInput(cu);
			syncConnect(editorInput, cu);
		}
		if (cu.isWorkingCopy())
			return cu;
		return javaWorkingCopyManager.getWorkingCopy(editorInput);
	}

	/**
	 * This will save all of the referenced CompilationUnits to be saved.
	 */
	protected void primSaveCompilationUnits(org.eclipse.core.runtime.IProgressMonitor monitor) {
		super.primSaveCompilationUnits(null);
		saveExistingCompilationUnits(monitor);
	}

	protected void primSaveDocument(IEditorInput input, IDocument doc, IProgressMonitor monitor) throws CoreException {
		try {
			cuDocumentProvider.saveDocument(monitor, input, doc, true); // overwrite if needed
		} catch (CoreException ex) {
			if (!isFailedWriteFileFailure(ex))
				throw ex;
			IResource resource = (IResource) input.getAdapter(IRESOURCE_CLASS);
			if (resource == null || resource.getType() != IResource.FILE || !resource.getResourceAttributes().isReadOnly())
				throw ex;

			if (getSaveHandler().shouldContinueAndMakeFileEditable((IFile) resource))
				cuDocumentProvider.saveDocument(monitor, input, doc, false);
			else
				throw ex;
		}
	}

	protected void saveDocument(IEditorInput input, IProgressMonitor monitor) {
		IDocument doc = cuDocumentProvider.getDocument(input);
		boolean canSave = cuDocumentProvider.canSaveDocument(input);
		try {
			if (canSave) {
				ICompilationUnit unit = javaWorkingCopyManager.getWorkingCopy(input);
				synchronized (unit) {
					cuDocumentProvider.aboutToChange(input);
					primSaveDocument(input, doc, monitor);
				}
			}
		} catch (CoreException e) {
			WTPCommonPlugin.getDefault().getLogger().logError(e);
			throw new SaveFailedException(e);
		} finally {
			if (canSave)
				cuDocumentProvider.changed(input);
		}
	}

	/**
	 * This will save all of the referenced CompilationUnits to be saved.
	 */
	protected void saveExistingCompilationUnits(org.eclipse.core.runtime.IProgressMonitor monitor) {
		if (getEditorInputs().isEmpty())
			return;
		if (!validateState()) {
			if (monitor != null)
				monitor.setCanceled(true);
			return;
		}
		Iterator it = getEditorInputs().entrySet().iterator();
		Map.Entry entry;
		//	ICompilationUnit cu;
		IEditorInput input;
		try {
			while (it.hasNext()) {
				entry = (Map.Entry) it.next();
				//			cu = (ICompilationUnit) entry.getKey();
				input = (IEditorInput) entry.getValue();
				try {
					saveDocument(input, null);
				} finally {
					disconnect(input);
				}
			}
		} finally {
			getEditorInputs().clear();
		}
	}

	/**
	 * Call validateEdit for all read only IFiles corresponding to each WorkingCopy.
	 * 
	 * @return boolean
	 */
	private boolean validateState() {
		List readOnlyFiles = getReadOnlyModifiedFiles();
		if (readOnlyFiles != null && !readOnlyFiles.isEmpty()) {
			IFile[] files = new IFile[readOnlyFiles.size()];
			readOnlyFiles.toArray(files);
			IWorkbenchWindow win = PlatformUI.getWorkbench().getActiveWorkbenchWindow();
			Object ctx = win == null ? null : win.getShell();
			IStatus status = ResourcesPlugin.getWorkspace().validateEdit(files, ctx);
			return status.isOK();
		}
		return true;
	}

	private List getReadOnlyModifiedFiles() {
		List readOnlyFiles = null;
		IFile readOnlyFile = null;
		Iterator it = getEditorInputs().entrySet().iterator();
		Map.Entry entry;
		//	ICompilationUnit cu;
		IEditorInput input;
		IDocumentProvider docProv = cuDocumentProvider;
		while (it.hasNext()) {
			readOnlyFile = null;
			entry = (Map.Entry) it.next();
			//		cu = (ICompilationUnit) entry.getKey();
			input = (IEditorInput) entry.getValue();
			if (docProv.canSaveDocument(input))
				readOnlyFile = getReadOnlyFile(input);
			if (readOnlyFile != null) {
				if (readOnlyFiles == null)
					readOnlyFiles = new ArrayList();
				readOnlyFiles.add(readOnlyFile);
			}
		}
		return readOnlyFiles;
	}

	private IFile getReadOnlyFile(IEditorInput input) {
		if (input instanceof IFileEditorInput) {
			IFileEditorInput finput = (IFileEditorInput) input;
			IFile file = finput.getFile();
			if (file.isReadOnly())
				return file;
		}
		return null;
	}


	protected void addDeletedCompilationUnit(ICompilationUnit cu) {
		IEditorInput input = primGetEditorInput(cu);
		if (input != null)
			disconnect(input);
		getEditorInputs().remove(cu);
		super.addDeletedCompilationUnit(cu);
	}

	/**
	 * @see com.ibm.etools.j2ee.workbench.IJ2EEWorkingCopyManager#hasWorkingCopies()
	 */
	public boolean hasWorkingCopies() {
		return super.hasWorkingCopies() || (editorInputs != null && !editorInputs.isEmpty());
	}

}