/*******************************************************************************
 * Copyright (c) 2006 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.team.examples.model;

import java.io.*;
import java.util.ArrayList;
import java.util.List;

import org.eclipse.core.resources.*;
import org.eclipse.core.runtime.*;
import org.eclipse.osgi.util.NLS;
import org.eclipse.team.examples.filesystem.FileSystemPlugin;

public class ModelObjectDefinitionFile extends ModelFile {

	public static final String MODEL_OBJECT_DEFINITION_FILE_EXTENSION = "mod";

	public static boolean isModFile(IResource resource) {
		if (resource instanceof IFile) {
			String fileExtension = resource.getFileExtension();
			if (fileExtension != null)
				return fileExtension.equals(MODEL_OBJECT_DEFINITION_FILE_EXTENSION);
		}
		return false;
	}
	
	public static IResource[] getReferencedResources(String projectName, IStorage storage) throws CoreException {
		if (storage == null)
			return new IResource[0];
		List result = new ArrayList();
		String[] filePaths = readLines(storage);
		for (int i = 0; i < filePaths.length; i++) {
			String path = filePaths[i];
			IFile file = getFile(projectName, path);
			if (file != null 
					&& file.getFileExtension() != null 
					&& file.getFileExtension().equals(ModelObjectElementFile.MODEL_OBJECT_ELEMENTFILE_EXTENSION)) {
				result.add(file);
			}
		}
		return (IResource[]) result.toArray(new IResource[result.size()]);
	}
	
	public ModelObjectDefinitionFile(IFile file) {
		super(file);
	}
	
	/* (non-Javadoc)
	 * @see org.eclipse.team.examples.model.ModelObject#getChildren()
	 */
	public ModelObject[] getChildren() throws CoreException {
		return getModelObjectElementFiles();
	}

	public ModelObjectElementFile[] getModelObjectElementFiles() throws CoreException {
		List result = new ArrayList();
		String[] filePaths = readLines((IFile)getResource());
		for (int i = 0; i < filePaths.length; i++) {
			String path = filePaths[i];
			IFile file = getFile(getResource().getProject().getName(), path);
			if (file != null) {
				ModelObjectElementFile moeFile = getMoeFile(file);
				if (moeFile != null)
					result.add(moeFile);
			}
		}
		return (ModelObjectElementFile[]) result.toArray(new ModelObjectElementFile[result.size()]);
	}

	private static String[] readLines(IStorage file) throws CoreException {
		BufferedReader reader = new BufferedReader(new InputStreamReader(file.getContents()));
		String line = null;
		List result = new ArrayList();
		try {
			while ((line = reader.readLine()) != null) {
				result.add(line.trim());
			}
		} catch (IOException e) {
			throw new CoreException(new Status(IStatus.ERROR, FileSystemPlugin.ID, 0, 
					NLS.bind("Error reading from file {0}", file.getFullPath()), e));
		} finally {
			try {
				reader.close();
			} catch (IOException e) {
				// Ignore
			}
		}
		return (String[]) result.toArray(new String[result.size()]);
	}

	private void writeLines(String[] strings) throws CoreException {
		StringBuffer buffer = new StringBuffer();
		for (int i = 0; i < strings.length; i++) {
			String string = strings[i];
			buffer.append(string);
			buffer.append("\n");
		}
		((IFile)getResource()).setContents(new ByteArrayInputStream(buffer.toString().getBytes()), false, true, null);
	}
	
	private ModelObjectElementFile getMoeFile(IFile file) {
		if (ModelObjectElementFile.isMoeFile(file)) {
			return new ModelObjectElementFile(this, file);
		}
		return null;
	}

	private static IFile getFile(String projectName, String path) {
		if (path.length() == 0)
			return null;
		IWorkspace workspace = ResourcesPlugin.getWorkspace();
		IStatus status = workspace.validatePath("/" + projectName + "/" + path, IResource.FILE);
		if (status.isOK()) {
			IProject project = workspace.getRoot().getProject(projectName);
			return project.getFile(new Path(path));
		}
		FileSystemPlugin.log(status);
		return null;
	}

	public void addMoe(IFile file) throws CoreException {
		((IFile)getResource()).appendContents(new ByteArrayInputStream(("\n" + file.getProjectRelativePath()).getBytes()), false, true, null);
	}

	public void remove(ModelObjectElementFile file) throws CoreException {
		ModelObjectElementFile[] files = getModelObjectElementFiles();
		List paths = new ArrayList();
		for (int i = 0; i < files.length; i++) {
			ModelObjectElementFile child = files[i];
			if (!child.equals(file)) {
				paths.add(child.getResource().getProjectRelativePath().toString());
			}
		}
		writeLines((String[]) paths.toArray(new String[paths.size()]));
	}

	public void delete() throws CoreException {
		ModelObjectElementFile[] files = getModelObjectElementFiles();
		super.delete();
		for (int i = 0; i < files.length; i++) {
			ModelObjectElementFile file = files[i];
			file.getResource().delete(false, null);
		}
	}

	public void setElements(IResource[] resources) throws CoreException {
		List paths = new ArrayList();
		for (int i = 0; i < resources.length; i++) {
			IResource resource = resources[i];
			paths.add(resource.getProjectRelativePath().toString());
		}
		writeLines((String[]) paths.toArray(new String[paths.size()]));
	}

	public boolean hasMoe(IFile file) throws CoreException {
		ModelObjectElementFile[] files = getModelObjectElementFiles();
		for (int i = 0; i < files.length; i++) {
			ModelObjectElementFile child = files[i];
			if (child.getResource().equals(file))
				return true;
		}
		return false;
	}

}