/*

* Copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description:

*

* Project file utilities

*

*/

package com.nokia.tracecompiler.project;

import java.io.File;

import java.util.ArrayList;

import com.nokia.tracecompiler.engine.TraceCompilerEngineGlobals;

import com.nokia.tracecompiler.engine.TraceCompilerEngineErrorCodes.TraceCompilerErrorCode;

import com.nokia.tracecompiler.engine.project.ProjectEngine;

import com.nokia.tracecompiler.model.TraceCompilerException;

import com.nokia.tracecompiler.model.TraceModel;

import com.nokia.tracecompiler.source.SymbianConstants;

/**

 * Project file utilities

 *

 */

public final class ProjectUtils {

	/**

	 * Tries to locate existing file with given extension and if not found,

	 * proposes a new location for that file. The new location will be

	 * <i>createPath</i> or if that is null, the directory where the trace

	 * project file (.tbprj) resides. Trace project must be open before this can

	 * be called

	 *

	 * @param model

	 *            the trace model

	 * @param createPath

	 *            the path to create if existing file is not found

	 * @param fileName

	 *            the name for the new file

	 * @param appendProjectName

	 *            true if the name is appended to end of model name

	 * @return the project file path for the new file

	 * @throws TraceCompilerException

	 *             if the model does not have any project files

	 */

	public static String getLocationForFile(TraceModel model,

			String createPath, String fileName, boolean appendProjectName)

			throws TraceCompilerException {

		TraceProjectFile projectFile = model

				.getExtension(TraceProjectFile.class);

		if (projectFile == null) {

			throw new TraceCompilerException(

					TraceCompilerErrorCode.MODEL_NOT_READY);

		}

		String projectName = ""; //$NON-NLS-1$

		if (appendProjectName) {

			projectName = projectFile.getProjectName();

		}

		return getLocationForFile(projectFile.getPath(), projectName,

				createPath, fileName);

	}

	/**

	 * Tries to locate existing file with given extension and if not found,

	 * proposes a new location for that file. The new location will be

	 * <i>createPath</i> or if that is null, the directory where the trace

	 * project file resides. Trace project must be open before this can

	 * be called

	 *

	 * @param projectPath

	 *            path to the project

	 * @param projectName

	 *            name of the project

	 * @param createPath

	 *            the path to create if existing file is not found

	 * @param extension

	 *            the file extension for the new file

	 * @return the project file path for the new file

	 */

	public static String getLocationForFile(String projectPath,

			String projectName, String createPath, String extension) {

		ArrayList<String> searchPaths = new ArrayList<String>();

		if (createPath != null && createPath.length() > 0) {

			// If create path is explicitly specified, it is added to the search

			// path list

			searchPaths.add(createPath);

		}

		// Default directories are always included into search

		searchPaths.add(ProjectEngine.traceFolderName);

		searchPaths.add(SymbianConstants.GROUP_DIRECTORY);

		searchPaths.add(SymbianConstants.INCLUDE_DIRECTORY);

		String[] pathArr = new String[searchPaths.size()];

		searchPaths.toArray(pathArr);

		return getLocationForFile(projectPath, projectName, pathArr,

				createPath, extension);

	}

	/**

	 * Tries to locate existing file and if not found, proposes a new location

	 * for that file. The search starts from <i>projectPath</i>. If

	 * <i>checkParents</i> is true, the parent directories are also checked if

	 * the file is not found

	 *

	 * @param projectPath

	 *            path where to start the search

	 * @param projectName

	 *            the name of the project

	 * @param searchPaths

	 *            the sub-paths to be searched

	 * @param createPath

	 *            the sub-path to create if file is not found

	 * @param fileName

	 *            extension of the file to be located

	 * @return the project file path for the new file

	 */

	private static String getLocationForFile(String projectPath,

			String projectName, String[] searchPaths, String createPath,

			String fileName) {

		// If the project file is in one of the search paths, the path is

		// changed to its parent

		File projectPathFile = new File(projectPath);

		String projectPathName = projectPathFile.getName();

		for (int i = 0; i < searchPaths.length; i++) {

			if (searchPaths[i].equals(projectPathName)) {

				projectPath = projectPathFile.getParent();

				i = searchPaths.length;

			}

		}

		// Tries to find an existing file based on project path and project name

		String filePath = findProjectFile(projectPath, projectName,

				searchPaths, fileName, false);

		if (filePath == null) {

			// If file is not found, this returns a new path

			filePath = projectPath + File.separator + createPath

					+ File.separator + projectName + fileName;

		}

		return filePath;

	}

	/**

	 * Finds a project file or directory based on a file or directory

	 *

	 * @param startPath

	 *            the file name or path where to start search

	 * @param projectName

	 *            the name of the project file

	 * @param searchDirectories

	 *            the directories to search

	 * @param fileExtension

	 *            the file extension to be located or null if locating one of

	 *            the search directories

	 * @param checkParents

	 *            true if parent directories should be checked

	 * @return the file or directory path if found or null if not

	 */

	private static String findProjectFile(String startPath, String projectName,

			String[] searchDirectories, String fileExtension,

			boolean checkParents) {

		String foundFile = null;

		if (startPath != null) {

			File file = new File(startPath);

			if (!file.isDirectory()) {

				file = file.getParentFile();

			}

			if (file != null) {

				do {

					for (int i = 0; i < searchDirectories.length

							&& foundFile == null; i++) {

						foundFile = findProjectFile(searchDirectories[i],

								projectName, fileExtension, file);

					}

					file = file.getParentFile();

				} while (file != null && foundFile == null && checkParents);

			}

		}

		return foundFile;

	}

	/**

	 * Searches a single directory for a project file

	 *

	 * @param searchDirectory

	 *            the directory to search

	 * @param fileExtension

	 *            the file extension to be located or null if locating one of

	 *            the search directories

	 * @param projectName

	 *            the name of the project file

	 * @param file

	 *            the current file

	 * @return the file or directory path if found or null if not

	 */

	private static String findProjectFile(String searchDirectory,

			String projectName, String fileExtension, File file) {

		String foundFile = null;

		File projectPath = new File(file.getAbsolutePath() + File.separator

				+ searchDirectory + File.separator);

		if (projectPath.exists()) {

			if (fileExtension == null) {

				foundFile = projectPath.getAbsolutePath();

			} else {

				foundFile = findProjectFileFromDirectory(projectPath,

					projectName, fileExtension);

			}

		}

		return foundFile;

	}

	/**

	 * Gets the first file with given extension from given directory

	 *

	 * @param path

	 *            the path to search

	 * @param projectName

	 *            the name of the project file

	 * @param fileExtension

	 *            the file extension

	 * @return the file name if found or null if not

	 */

	private static String findProjectFileFromDirectory(File path,

			String projectName, String fileExtension) {

		String proposal = null;

		File[] files = path.listFiles();

		if (projectName != null) {

			// If project name is specified, only the file that matches the name

			// is returned

			String nameFromProjectFile = projectName + fileExtension;

			// Check does user have access rights to the traces folder

			if (path.canWrite() == false) {

				TraceCompilerEngineGlobals

						.getEvents()

						.postErrorMessage(

								Messages

										.getString("ProjectUtils.accesRightErrorText"), null, true); //$NON-NLS-1$

				System.exit(1);

			}

			for (int i = 0; i < files.length && proposal == null; i++) {

				String fname = files[i].getName();

				if (fname.equals(nameFromProjectFile)) {

					proposal = files[i].getAbsolutePath();

				}

			}

		} else {

			// If project name is not specified, this proposes the first file

			// which ends with the file extension

			for (int i = 0; i < files.length && proposal == null; i++) {

				String fname = files[i].getName();

				if (fname.length() > fileExtension.length()) {

					int extstart = fname.length() - fileExtension.length();

					if (fname.substring(extstart).equals(fileExtension)) {

						proposal = files[i].getAbsolutePath();

					}

				}

			}

		}

		return proposal;

	}

}