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/*******************************************************************************
 * Copyright (c) 2000, 2011 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.compare.internal;

import java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.util.ResourceBundle;
import java.lang.reflect.InvocationTargetException;

import org.eclipse.core.resources.*;
import org.eclipse.core.runtime.*;

import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.graphics.Image;

import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.jface.dialogs.ProgressMonitorDialog;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.text.IDocument;
import org.eclipse.jface.text.BadLocationException;

import org.eclipse.ui.*;
import org.eclipse.ui.part.FileEditorInput;
import org.eclipse.ui.texteditor.ITextEditor;
import org.eclipse.ui.texteditor.IDocumentProvider;
import org.eclipse.ui.actions.WorkspaceModifyOperation;

import org.eclipse.compare.*;
import org.eclipse.compare.ITypedElement;
import org.eclipse.compare.IStreamContentAccessor;


public class EditionAction extends BaseCompareAction {

	/**
	 * Implements the IStreamContentAccessor and ITypedElement protocols
	 * for a Document.
	 */
	class DocumentBufferNode implements ITypedElement, IEncodedStreamContentAccessor {
		private static final String UTF_16= "UTF-16"; //$NON-NLS-1$
		private IDocument fDocument;
		private IFile fFile;
		
		DocumentBufferNode(IDocument document, IFile file) {
			fDocument= document;
			fFile= file;
		}
		
		public String getName() {
			return fFile.getName();
		}
		
		public String getType() {
			return fFile.getFileExtension();
		}
		
		public Image getImage() {
			return null;
		}
		
		public InputStream getContents() {
			return new ByteArrayInputStream(Utilities.getBytes(fDocument.get(), UTF_16));
		}

		public String getCharset() {
			return UTF_16;
		}
	}

	private String fBundleName;
	private boolean fReplaceMode;
	protected boolean fPrevious= false;
	protected String fHelpContextId;
	
	EditionAction(boolean replaceMode, String bundleName) {
		fReplaceMode= replaceMode;
		fBundleName= bundleName;
	}

	protected boolean isEnabled(ISelection selection) {
		return Utilities.getFiles(selection).length == 1;		// we don't support multiple selection for now
	}

	protected void run(ISelection selection) {
		IFile[] files= Utilities.getFiles(selection);
		for (int i= 0; i < files.length; i++)
			doFromHistory(files[i]);
	}

	private void doFromHistory(final IFile file) {
						
		ResourceBundle bundle= ResourceBundle.getBundle(fBundleName);
		String title= Utilities.getString(bundle, "title"); //$NON-NLS-1$
			
		Shell parentShell= CompareUIPlugin.getShell();
		
		IFileState states[]= null;
		try {
			states= file.getHistory(null);
		} catch (CoreException ex) {		
			MessageDialog.openError(parentShell, title, ex.getMessage());
			return;
		}
		
		if (states == null || states.length <= 0) {
			String msg= Utilities.getString(bundle, "noLocalHistoryError"); //$NON-NLS-1$
			MessageDialog.openInformation(parentShell, title, msg);
			return;
		}
		
		ITypedElement base= new ResourceNode(file);
		
		IDocument document= getDocument(file);
		ITypedElement target= base;
		if (document != null)
			target= new DocumentBufferNode(document, file);
	
		ITypedElement[] editions= new ITypedElement[states.length+1];
		editions[0]= base;
		for (int i= 0; i < states.length; i++)
			editions[i+1]= new HistoryItem(base, states[i]);

		EditionSelectionDialog d= new EditionSelectionDialog(parentShell, bundle);
		d.setEditionTitleArgument(file.getName());
		d.setEditionTitleImage(CompareUIPlugin.getImage(file));
		//d.setHideIdenticalEntries(false);
		if (fHelpContextId != null)
			d.setHelpContextId(fHelpContextId);
		
		if (fReplaceMode) {
			
			ITypedElement ti= null;
			if (fPrevious)
				ti= d.selectPreviousEdition(target, editions, null);
			else
				ti= d.selectEdition(target, editions, null);
			
			if (ti instanceof IStreamContentAccessor) {
				IStreamContentAccessor sa= (IStreamContentAccessor)ti;
				
				if (Utilities.validateResource(file, parentShell, title)) {
					try {
	
						if (document != null)
							updateDocument(document, sa);	
						else
							updateWorkspace(bundle, parentShell, sa, file);
							
					} catch (InterruptedException x) {
						// Do nothing. Operation has been canceled by user.
						
					} catch (InvocationTargetException x) {
						String reason= x.getTargetException().getMessage();
						MessageDialog.openError(parentShell, title, Utilities.getFormattedString(bundle, "replaceError", reason));	//$NON-NLS-1$
					}
				}
			}
		} else {
			d.setCompareMode(true);

			d.selectEdition(target, editions, null);			
		}
	}
	
	private void updateWorkspace(final ResourceBundle bundle, Shell shell,
						final IStreamContentAccessor sa, final IFile file)
									throws InvocationTargetException, InterruptedException {	
		WorkspaceModifyOperation operation= new WorkspaceModifyOperation() {
			public void execute(IProgressMonitor pm) throws InvocationTargetException {
				try {
					String taskName= Utilities.getString(bundle, "taskName"); //$NON-NLS-1$
					pm.beginTask(taskName, IProgressMonitor.UNKNOWN);
					file.setContents(sa.getContents(), false, true, pm);
				} catch (CoreException e) {
					throw new InvocationTargetException(e);
				} finally {
					pm.done();
				}
			}
		};
		
		ProgressMonitorDialog pmdialog= new ProgressMonitorDialog(shell);				
		pmdialog.run(false, true, operation);									
	}
	
	private void updateDocument(IDocument document, IStreamContentAccessor sa) throws InvocationTargetException {
		try {
			String text= Utilities.readString(sa);
			document.replace(0, document.getLength(), text);
		} catch (CoreException e) {
			throw new InvocationTargetException(e);
		} catch (BadLocationException e) {
			throw new InvocationTargetException(e);
		}
	}
	
	private IDocument getDocument(IFile file) {
		IWorkbench wb= PlatformUI.getWorkbench();
		if (wb == null)
			return null;
		IWorkbenchWindow[] ws= wb.getWorkbenchWindows();
		if (ws == null)
			return null;
			
		FileEditorInput test= new FileEditorInput(file);
		
		for (int i= 0; i < ws.length; i++) {
			IWorkbenchWindow w= ws[i];
			IWorkbenchPage[] wps= w.getPages();
			if (wps != null) {
				for (int j= 0; j < wps.length; j++) {
					IWorkbenchPage wp= wps[j];
					IEditorPart ep= wp.findEditor(test);
					if (ep instanceof ITextEditor) {
						ITextEditor te= (ITextEditor) ep;
						IDocumentProvider dp= te.getDocumentProvider();
						if (dp != null) {
							IDocument doc= dp.getDocument(ep);
							if (doc != null)
								return doc;
						}
					}
				}
			}
		}
		return null;
	}
}