source: trunk/src/org/expeditee/gui/FrameIO.java@ 1415

/**
 *    FrameIO.java
 *    Copyright (C) 2010 New Zealand Digital Library, http://expeditee.org
 *
 *    This program is free software: you can redistribute it and/or modify
 *    it under the terms of the GNU General Public License as published by
 *    the Free Software Foundation, either version 3 of the License, or
 *    (at your option) any later version.
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    GNU General Public License for more details.
 *
 *    You should have received a copy of the GNU General Public License
 *    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package org.expeditee.gui;

import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.Writer;
import java.nio.channels.FileChannel;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.StandardCopyOption;
import java.sql.Time;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.function.Consumer;
import java.util.stream.Collectors;

import org.apollo.io.AudioPathManager;
import org.expeditee.actions.Actions;
import org.expeditee.agents.ExistingFramesetException;
import org.expeditee.agents.InvalidFramesetNameException;
import org.expeditee.auth.AuthenticatorBrowser;
import org.expeditee.auth.mail.gui.MailBay;
import org.expeditee.encryption.io.EncryptedExpReader;
import org.expeditee.encryption.io.EncryptedExpWriter;
import org.expeditee.gio.EcosystemManager;
import org.expeditee.io.Conversion;
import org.expeditee.io.ExpReader;
import org.expeditee.io.ExpWriter;
import org.expeditee.io.FrameReader;
import org.expeditee.io.FrameWriter;
import org.expeditee.io.KMSReader;
import org.expeditee.io.KMSWriter;
import org.expeditee.items.Item;
import org.expeditee.items.ItemUtils;
import org.expeditee.items.Justification;
import org.expeditee.items.PermissionTriple;
import org.expeditee.items.Text;
import org.expeditee.items.UserAppliedPermission;
import org.expeditee.network.FrameShare;
import org.expeditee.setting.Setting;
import org.expeditee.settings.UserSettings;
import org.expeditee.settings.folders.FolderSettings;
import org.expeditee.settings.templates.TemplateSettings;
import org.expeditee.stats.Formatter;
import org.expeditee.stats.Logger;
import org.expeditee.stats.SessionStats;

/**
 * This class provides static methods for all saving and loading of Frames
 * to\from disk. This class also handles any caching of previously loaded
 * Frames.
 * 
 * @author jdm18
 * 
 */

public class FrameIO {

        private static final char FRAME_NAME_LAST_CHAR = 'A';

        // The parent path that all others are relative to.  Also referred to as Expeditee Home.
        public static String PARENT_FOLDER;

        public static String PROFILE_PATH;
        public static String FRAME_PATH;
        public static String IMAGES_PATH;
        public static String AUDIO_PATH;
        public static String PUBLIC_PATH;
        public static String TRASH_PATH;
        public static String FONT_PATH;
        public static String DICT_PATH;
        public static String EXPORTS_PATH;
        public static String STATISTICS_PATH;
        public static String LOGS_PATH;
        public static String MESSAGES_PATH;
        public static String MAIL_PATH;
        public static String SHARED_FRAMESETS_PATH;
        public static String CONTACTS_PATH;
        public static String RESOURCES_PRIVATE_PATH;
        public static String RESOURCES_PATH;
        public static String FRAME_PRIVATE_PATH;
        public static String IMAGES_PRIVATE_PATH;
        public static String AUDIO_PRIVATE_PATH;
        public static String HELP_PRIVATE_PATH;
        public static String HELP_PATH;
        public static String DEAD_DROPS_PATH;
        public static String GROUP_PATH;

        // Paths that appear to be unused.
        public static String TEMPLATES_PATH;
                        
        // Variables for controlling cache functionality.
        public static final int MAX_NAME_LENGTH = 64;
        public static final int MAX_CACHE = 100;
        private static HashMap<String, Frame> _Cache = new FrameCache();
        private static final boolean ENABLE_CACHE = true;
        private static boolean _UseCache = true;
        private static boolean _SuspendedCache = false;
        
        private static final String INF_FILENAME = "frame.inf";
        
        public static void changeParentAndSubFolders(String newFolder) {
                // Partial Paths
                PARENT_FOLDER = newFolder;
                PUBLIC_PATH = PARENT_FOLDER + "public" + File.separator;
                TRASH_PATH = PARENT_FOLDER + "trash" + File.separator;
                PROFILE_PATH = PARENT_FOLDER + "profiles" + File.separator;
                EXPORTS_PATH = PARENT_FOLDER + "exports" + File.separator;
                STATISTICS_PATH = PARENT_FOLDER + "statistics" + File.separator;
                LOGS_PATH = PARENT_FOLDER + "logs" + File.separator;
                
                String resourcesPublicPath = PARENT_FOLDER + "resources-public" + File.separator;
                String resourcesPrivateIndividualPath = PARENT_FOLDER + "resources-" + UserSettings.UserName.get() + File.separator;
                
                if (UserSettings.PublicAndPrivateResources) {
                        // Paths for the new regime
                        FONT_PATH = resourcesPublicPath + "fonts" + File.separator;
                        DICT_PATH = resourcesPublicPath + "dict" + File.separator;
                        HELP_PATH = resourcesPublicPath + "documentation" + File.separator;
                        HELP_PRIVATE_PATH = resourcesPrivateIndividualPath + "documentation" + File.separator;
                        FRAME_PATH = resourcesPublicPath + "framesets" + File.separator;
                        FRAME_PRIVATE_PATH = resourcesPrivateIndividualPath + "framesets" + File.separator;
                        MESSAGES_PATH = resourcesPrivateIndividualPath + "messages" + File.separator;
                        IMAGES_PATH = resourcesPublicPath + "images" + File.separator;
                        IMAGES_PRIVATE_PATH = resourcesPrivateIndividualPath + "images" + File.separator;
                        AUDIO_PATH = resourcesPublicPath + "audio" + File.separator;
                        AUDIO_PRIVATE_PATH = resourcesPrivateIndividualPath + "audio" + File.separator;
                        GROUP_PATH = resourcesPrivateIndividualPath + "groups" + File.separator;

                        // Used only when extracting resources (when expeditee is run for first time)
                        RESOURCES_PRIVATE_PATH = PARENT_FOLDER + "resources-private" + File.separator;
                        
                        if (AuthenticatorBrowser.isAuthenticated()) {
                                // Paths for the new regime while authenticated
                                SHARED_FRAMESETS_PATH = resourcesPrivateIndividualPath + "framesets-shared" + File.separator;
                                DEAD_DROPS_PATH = resourcesPrivateIndividualPath + "deaddrops" + File.separator;
                                CONTACTS_PATH = resourcesPrivateIndividualPath + "contacts" + File.separator;
                                MAIL_PATH = resourcesPrivateIndividualPath + "mail" + File.separator;
                        } else {
                                SHARED_FRAMESETS_PATH = null;
                                DEAD_DROPS_PATH = null;
                                CONTACTS_PATH = null;
                                MAIL_PATH = null;
                        }
                } else {
                        // Paths for the old regime
                        FONT_PATH = PARENT_FOLDER + "fonts" + File.separator;
                        DICT_PATH = PARENT_FOLDER + "dict" + File.separator;
                        HELP_PATH = PARENT_FOLDER + "documentation" + File.separator;
                        FRAME_PATH = PARENT_FOLDER + "framesets" + File.separator;
                        MESSAGES_PATH = PARENT_FOLDER + "messages" + File.separator;
                        IMAGES_PATH = PARENT_FOLDER + "images" + File.separator;
                        AUDIO_PATH = PARENT_FOLDER + "audio" + File.separator;
                        GROUP_PATH = PARENT_FOLDER + "groups" + File.separator;
                        
                        // These paths are not used by old regime.
                        HELP_PRIVATE_PATH = null;
                        FRAME_PRIVATE_PATH = null;
                        IMAGES_PRIVATE_PATH = null;
                        AUDIO_PRIVATE_PATH = null;
                        // - This last one is never used because old regime is never extracted.  If we are going to FrameUtils.extractResources then we are doing new regime.
                        RESOURCES_PRIVATE_PATH = null;
                        
                        if (AuthenticatorBrowser.isAuthenticated()) {
                                // Paths for the old regime while authenticated
                                SHARED_FRAMESETS_PATH = PARENT_FOLDER + "framesets-shared" + File.separator;
                                DEAD_DROPS_PATH = PARENT_FOLDER + "deaddrops" + File.separator;
                                CONTACTS_PATH = PARENT_FOLDER + "contacts" + File.separator;
                                MAIL_PATH = PARENT_FOLDER + "mail" + File.separator;
                        } else {
                                SHARED_FRAMESETS_PATH = null;
                                DEAD_DROPS_PATH = null;
                                CONTACTS_PATH = null;
                                MAIL_PATH = null;
                        }
                }
                
                System.err.println("**** FrameIO::changeParentAndSubFolder(): Calling AudioPathManger.changeParentAndSubFolder()");
                AudioPathManager.changeParentAndSubFolders(newFolder);
        }
        
        // All methods are static, this should not be instantiated
        private FrameIO() {
        }

        public static boolean isCacheOn() {
                return _UseCache && ENABLE_CACHE;
        }

        public static void Precache(String framename) {
                // if the cache is turned off, do nothing
                if (!isCacheOn()) {
                        return;
                }

                // if the frame is already in the cache, do nothing
                if (_Cache.containsKey(framename.toLowerCase())) {
                        return;
                }

                // otherwise, load the frame and put it in the cache
                Logger.Log(Logger.SYSTEM, Logger.LOAD, "Precaching " + framename + ".");

                // do not display errors encountered to the user
                // (they will be shown at load time)
                MessageBay.suppressMessages(true);
                // loading automatically caches the frame is caching is turned on
                LoadFromDisk(framename, null, false);
                MessageBay.suppressMessages(false);
        }

        /**
         * Checks if a string is a representation of a positive integer.
         * 
         * @param s
         * @return true if s is a positive integer
         */
        public static boolean isPositiveInteger(String s) {
                if (s == null || s.length() == 0) {
                        return false;
                }

                for (int i = 0; i < s.length(); i++) {
                        if (!Character.isDigit(s.charAt(i))) {
                                return false;
                        }
                }
                return true;
        }
        
        /**
         * Loads a frame with the specified name.  
         * By using a dot separated framename, users are able to specify the path to find the frameset in.
         * @param frameName The frame to load.
         * @return the loaded frame
         */
        public static Frame LoadFrame(String frameName) {
                if (frameName.contains(".")) {
                        String[] split = frameName.split("\\.");
                        String[] pathSplit = Arrays.copyOfRange(split, 0, split.length - 1);
                        String name = split[split.length - 1];
                        String path = Arrays.asList(pathSplit).stream().collect(Collectors.joining(File.separator));
                        return LoadFrame(name, Paths.get(FrameIO.PARENT_FOLDER).resolve(path).toString() + File.separator, false);
                } else {
                        return LoadFrame(frameName, null, false);
                }
        }

        public static Frame LoadFrame(String frameName, String path) {
                return LoadFrame(frameName, path, false);
        }

        public static Frame LoadFrame(String frameName, String path, boolean ignoreAnnotations) {
                if (!isValidFrameName(frameName)) {
                        return null;
                }
                
                String frameNameLower = frameName.toLowerCase();
                // first try reading from cache
                if (isCacheOn() && _Cache.containsKey(frameNameLower)) {
                        Logger.Log(Logger.SYSTEM, Logger.LOAD, "Loading " + frameName + " from cache.");
                        Frame frame = _Cache.get(frameNameLower);
                        
                        // if frame in cache is older than the one on disk then don't use the cached one
                        File file = new File(frame.getFramePathReal());
                        long lastModified = file.lastModified();
                        if (lastModified <= frame.getLastModifyPrecise()) {
                                return frame;
                        }
                }

                Logger.Log(Logger.SYSTEM, Logger.LOAD, "Loading " + frameName
                                + " from disk.");

                Frame fromDisk = LoadFromDisk(frameName, path, ignoreAnnotations);
                return fromDisk;
        }

        //Loads the 'restore' version of a frame if there is one
        public static Frame LoadRestoreFrame(Frame frameToRestore) {                    
                        
                String fullPath = getFrameFullPathName(frameToRestore.getPath(), frameToRestore
                                .getName());
                //System.out.println("fullpath: " + fullPath);
                String restoreVersion = fullPath + ".restore";
                //System.out.println("restoreversion" + restoreVersion);
                File source = new File(restoreVersion);
                File dest = new File(fullPath);
                
                FileChannel inputChannel = null;
                FileChannel outputChannel = null;
                
                try{
                        FileInputStream source_fis = new FileInputStream(source);
                        inputChannel = source_fis.getChannel();
                        
                        FileOutputStream dest_fos = new FileOutputStream(dest);
                        outputChannel = dest_fos.getChannel();
                                
                        outputChannel.transferFrom(inputChannel, 0, inputChannel.size());
                        inputChannel.close();
                        outputChannel.close();
                        source_fis.close();
                        dest_fos.close();
                }                
                catch(Exception e){     
                        System.err.println("No restore point detected.");
                }
                String frameName = frameToRestore.getName();
                String frameNameLower = frameName.toLowerCase();
                
                // first try reading from cache
                if (isCacheOn() && _Cache.containsKey(frameNameLower)) {
                        Logger.Log(Logger.SYSTEM, Logger.LOAD, "Clearing " + frameName
                                        + " from cache.");
                        _Cache.remove(frameNameLower);                          
                }
                
                return LoadFrame(frameName, frameToRestore.getPath(), true);
        }               
                
        public static BufferedReader LoadPublicFrame(String frameName) {
                String fullPath = FrameIO.getFrameFullPathName(PUBLIC_PATH, frameName);

                if (fullPath == null) {
                        return null;
                }

                File frameFile = new File(fullPath);
                if (frameFile.exists() && frameFile.canRead()) {
                        try {
                                return new BufferedReader(new FileReader(frameFile));
                        } catch (FileNotFoundException e) {
                                e.printStackTrace();
                        }
                }
                return null;
        }

        private static Frame LoadFromDisk(String framename, String knownPath,
                        boolean ignoreAnnotations) {
                Frame loaded = null;

                if (knownPath != null) {
                        loaded = LoadKnownPath(knownPath, framename);
                } else {
                        List<String> directoriesToSearch = FolderSettings.FrameDirs.getAbsoluteDirs();
                        
//                      if (AuthenticatorBrowser.Authenticated) {
//                              // if we are running Expeditee Authenticated, consult user profile as location for framesets first
//                              String profilePath = FrameIO.PROFILE_PATH + UserSettings.UserName.get() + File.separator;
//                              directoriesToSearch.add(0, profilePath);
//                      } 
                        
                        for (String path : directoriesToSearch) {
                                loaded = LoadKnownPath(path, framename);
                                if (loaded != null) {
                                        break;
                                }
                        }
                }

                if (loaded == null && FrameShare.getInstance() != null) {
                        loaded = FrameShare.getInstance().loadFrame(framename, knownPath);
                }

                if (loaded != null) {
                        FrameUtils.Parse(loaded, true, ignoreAnnotations);
                        FrameIO.setSavedProperties(loaded);
                }

                return loaded;
        }

        /**
         * Gets a list of all the framesets available to the user
         * 
         * @return a string containing a list of all the available framesets on
         *         separate lines
         */
        public static String getFramesetList() {
                StringBuffer list = new StringBuffer();

                for (String path : FolderSettings.FrameDirs.getAbsoluteDirs()) {
                        File files = new File(path);
                        if (!files.exists()) {
                                continue;
                        }
                        for (File f : (new File(path)).listFiles()) {
                                if (f.isDirectory()) {
                                        list.append(f.getName()).append('\n');
                                }
                        }
                }
                // remove the final new line char
                list.deleteCharAt(list.length() - 1);
                return list.toString();
        }
        
        /**
         * Gets a list of all the profiles available to the user
         * 
         * @return a list containing all the available framesets on separate lines
         */
        public static List<String> getProfilesList() {
                File[] listFiles = new File(FrameIO.PROFILE_PATH).listFiles();
                if (listFiles == null) return new ArrayList<String>();
                List<File> potentialProfiles = Arrays.asList(listFiles);
                potentialProfiles.removeIf(file -> !file.isDirectory());
                return potentialProfiles.stream().map(dir -> dir.getName()).collect(Collectors.toList());
        }

        /**
         * Gets the full path and file name of the frame.
         * This is a alias for Frame::getFramePathLogical
         * @param path-
         *            the directory in which to look for the frameset containing the
         *            frame.
         * @param frameName-
         *            the name of the frame for which the path is being requested.
         * @return null if the frame can not be located.
         */
        public static synchronized String getFrameFullPathName(String path,
                        String frameName) {
                
                String source;
                String fileName = null;
                if(frameName.contains("restore")){
                        source = path + File.separator;// + frameName;
                        fileName = path + File.separator + frameName + ExpReader.EXTENTION;
                        
                }
                else
                {
                        source = path + Conversion.getFramesetName(frameName)
                        + File.separator;
                }
        

                File tester = new File(source);
                if (!tester.exists()) {
                        return null;
                }

                String fullPath;
                
                if(frameName.contains("restore")){
                        
                        fullPath = fileName;
                }
                else
                {
                        // check for the new file name format
                        fullPath = source + Conversion.getFrameNumber(frameName)
                        + ExpReader.EXTENTION;
                }               
                
                tester = new File(fullPath);

                if (tester.exists()) {
                        return fullPath;
                }

                // check for oldfile name format
                fullPath = source + Conversion.getFramesetName(frameName) + "."
                                + Conversion.getFrameNumber(frameName);
                tester = new File(fullPath);

                if (tester.exists()) {
                        return fullPath;
                }

                return null;
        }

        public static boolean canAccessFrame(String frameName) {
                Frame current = DisplayController.getCurrentFrame();
                // Just in case the current frame is not yet saved...
                if (frameName.equals(current.getName())) {
                        FrameIO.SaveFrame(current, false, false);
                        current.change();
                        return true;
                }

                for (String path : FolderSettings.FrameDirs.getAbsoluteDirs()) {
                        if (getFrameFullPathName(path, frameName) != null) {
                                return true;
                        }
                }
                return false;
        }

        public static Collection<String> searchFrame(String frameName,
                        String pattern, String path) {
                String fullPath = null;
                if (path == null) {
                        for (String possiblePath : FolderSettings.FrameDirs.getAbsoluteDirs()) {
                                fullPath = getFrameFullPathName(possiblePath, frameName);
                                if (fullPath != null) {
                                        break;
                                }
                        }
                } else {
                        fullPath = getFrameFullPathName(path, frameName);
                }
                // If the frame was not located return null
                if (fullPath == null) {
                        return null;
                }
                Collection<String> results = new LinkedList<String>();
                // Open the file and search the text items
                try {
                        BufferedReader reader = new BufferedReader(new FileReader(fullPath));
                        String next;
                        while (reader.ready() && ((next = reader.readLine()) != null)) {
                                if (next.startsWith("T")) {
                                        String toSearch = next.substring(2);
                                        if (toSearch.toLowerCase().contains(pattern)) {
                                                results.add(toSearch);
                                        }
                                } else if (next.startsWith("+T+")) {
                                        String toSearch = next.substring(4);
                                        if (toSearch.toLowerCase().contains(pattern)) {
                                                results.add(toSearch);
                                        }
                                }
                        }
                        reader.close();
                } catch (FileNotFoundException e) {
                        e.printStackTrace();
                        return null;
                } catch (IOException e) {
                        e.printStackTrace();
                }
                return results;
        }

        private static Frame LoadKnownPath(String path, String frameName) {
                String fullPath = getFrameFullPathName(path, frameName);
                if (fullPath == null) {
                        return null;
                }

                try {
                        FrameReader reader;
                        
                        // Get the frameset name.
                        int i = frameName.length() - 1;
                        for (; i >= 0; i--) {
                                if (!Character.isDigit(frameName.charAt(i))) {
                                        break;
                                }       
                        }
                        if (i < 0) {
                                System.err.println("LoadKnownFrame was provided with a invalid Frame name: " + frameName);
                                return null;
                        }
                        String framesetName = frameName.substring(0, i + 1);
                        
                        String redirectTo = ExpReader.redirectTo(fullPath);
                        while (redirectTo != null) {
                                fullPath = path + framesetName + File.separator + redirectTo;
                                redirectTo = ExpReader.redirectTo(fullPath);
                        }
                        
                        if (fullPath.endsWith(ExpReader.EXTENTION)) {
                                if (EncryptedExpReader.isEncryptedExpediteeFile(fullPath)) {
                                        reader = new EncryptedExpReader(frameName);
                                } else {
                                        reader = new ExpReader(frameName);
                                }
                        } else {
                                reader = new KMSReader();
                        }
                        Frame frame = reader.readFrame(fullPath);

                        if (frame == null) {
                                MessageBay.errorMessage("Error: " + frameName
                                                + " could not be successfully loaded.");
                                return null;
                        }

                        frame.setPath(path);

                        // do not put 0 frames or virtual frames into the cache
                        // Why are zero frames not put in the cache
                        if (_Cache.size() > MAX_CACHE) {
                                _Cache.clear();
                        }

                        if (frame.getNumber() > 0 && isCacheOn()) {
                                _Cache.put(frameName.toLowerCase(), frame);
                        }

                        return frame;
                } catch (IOException ioe) {
                        ioe.printStackTrace();
                        Logger.Log(ioe);
                } catch (Exception e) {
                        e.printStackTrace();
                        Logger.Log(e);
                        MessageBay.errorMessage("Error: " + frameName
                                        + " could not be successfully loaded.");
                }

                return null;
        }

        public static void Reload() {
                // disable cache
                boolean cache = _UseCache;

                _UseCache = false;
                Frame fresh = FrameIO.LoadFrame(DisplayController.getCurrentFrame().getName());
                _UseCache = cache;
                if (_Cache.containsKey(fresh.getName().toLowerCase())) {
                        addToCache(fresh);
                }
                DisplayController.setCurrentFrame(fresh, false);
        }

        public static Frame LoadPrevious(Frame current) {
                checkTDFC(current);

                // the current name and number
                String name = current.getFramesetName();
                int num = current.getNumber() - 1;

                // loop until a frame that exists is found
                for (; num >= 0; num--) {
                        Frame f = LoadFrame(name + num, current.getPath());
                        if (f != null) {
                                return f;
                        }
                }

                // if we did not find another Frame then this one must be the last one
                // in the frameset
                MessageBay
                                .displayMessageOnce("This is the first frame in the frameset");
                return null;
        }

        /**
         * Returns the next Frame in the current Frameset (The Frame with the next
         * highest Frame number) If the current Frame is the last one in the
         * Frameset, or an error occurs then null is returned.
         * 
         * @return The Frame after this one in the current frameset, or null
         */
        public static Frame LoadNext(Frame current) {
                checkTDFC(current);

                // the current name and number
                int num = current.getNumber() + 1;
                int max = num + 1;
                String name = current.getFramesetName();

                // read the maximum from the INF file
                try {
                        max = ReadINF(current.getPath(), current.getFramesetName(), false);
                } catch (IOException ioe) {
                        MessageBay.errorMessage("Error loading INF file for frameset '"
                                        + name + "'");
                        return null;
                }

                // loop until a frame that exists is found
                for (; num <= max; num++) {
                        Frame f = LoadFrame(name + num, current.getPath());
                        if (f != null) {
                                return f;
                        }
                }

                // if we did not find another Frame then this one must be the last one
                // in the frameset
                MessageBay.displayMessageOnce("This is the last frame in the frameset");
                return null;
        }

        /**
         * This method checks if the current frame has just been created with TDFC.
         * If it has the frame is saved regardless of whether it has been edited or
         * not and the TDFC item property is cleared. This is to ensure that the
         * link is saved on the parent frame.
         * 
         * @param current
         */
        public static void checkTDFC(Frame current) {
                if (FrameUtils.getTdfcItem() != null) {
                        FrameUtils.setTdfcItem(null);
                        current.change();
                }
        }

        public static Frame LoadLast(String framesetName, String path) {
                // read the maximum from the INF file
                int max;
                try {
                        max = ReadINF(path, framesetName, false);
                } catch (IOException ioe) {
                        MessageBay.errorMessage("Error loading INF file for frameset '"
                                        + framesetName + "'");
                        return null;
                }

                // loop backwards until a frame that exists is found
                for (int num = max; num > 0; num--) {
                        Frame f = LoadFromDisk(framesetName + num, path, false);
                        if (f != null) {
                                return f;
                        }
                }

                // if we did not find another Frame then this one must be the last one
                // in the frameset
                MessageBay.displayMessage("This is the last frame in the frameset");
                return null;
        }

        public static Frame LoadZero(String framesetName, String path) {
                return LoadFrame(framesetName + 0);
        }

        public static Frame LoadZero() {
                Frame current = DisplayController.getCurrentFrame();
                return LoadZero(current.getFramesetName(), current.getPath());
        }

        public static Frame LoadLast() {
                Frame current = DisplayController.getCurrentFrame();
                return LoadLast(current.getFramesetName(), current.getPath());
        }

        public static Frame LoadNext() {
                return LoadNext(DisplayController.getCurrentFrame());
        }

        public static Frame LoadPrevious() {
                return LoadPrevious(DisplayController.getCurrentFrame());
        }

        /**
         * Deletes the given Frame on disk and removes the cached Frame if there is
         * one. Also adds the deleted frame into the deletedFrames frameset.
         * 
         * @param toDelete
         *            The Frame to be deleted
         * @return The name the deleted frame was changed to, or null if the delete
         *         failed
         */
        public static String DeleteFrame(Frame toDelete) throws IOException,
                        SecurityException {
                if (toDelete == null) {
                        return null;
                }

                // Dont delete the zero frame
                if (toDelete.getNumber() == 0) {
                        throw new SecurityException("Deleting a zero frame is illegal");
                }

                // Dont delete the zero frame
                if (!toDelete.isLocal()) {
                        throw new SecurityException("Attempted to delete remote frame");
                }

                SaveFrame(toDelete);

                // Copy deleted frames to the DeletedFrames frameset
                // get the last used frame in the destination frameset
                final String DELETED_FRAMES = "DeletedFrames";
                int lastNumber = FrameIO.getLastNumber(DELETED_FRAMES);
                String framePath;
                try {
                        // create the new frameset
                        Frame one = FrameIO.CreateFrameset(DELETED_FRAMES, toDelete
                                        .getPath());
                        framePath = one.getPath();
                        lastNumber = 0;
                } catch (Exception e) {
                        Frame zero = FrameIO.LoadFrame(DELETED_FRAMES + "0");
                        framePath = zero.getPath();
                }

                // get the fill path to determine which file version it is
                String source = getFrameFullPathName(toDelete.getPath(), toDelete
                                .getName());

                String oldFrameName = toDelete.getName().toLowerCase();
                // Now save the frame in the new location
                toDelete.setFrameset(DELETED_FRAMES);
                toDelete.setFrameNumber(lastNumber + 1);
                toDelete.setPath(framePath);
                ForceSaveFrame(toDelete);

                if (_Cache.containsKey(oldFrameName)) {
                        _Cache.remove(oldFrameName);
                }

                File del = new File(source);

                java.io.FileInputStream ff = new java.io.FileInputStream(del);
                ff.close();

                if (del.delete()) {
                        return toDelete.getName();
                }

                return null;
        }

        /**
         * Creates a new Frame in the given frameset and assigns it the given Title,
         * which can be null. The newly created Frame is a copy of the frameset's .0
         * file with the number updated based on the last recorded Frame name in the
         * frameset's INF file.
         * 
         * @param frameset
         *            The frameset to create the new Frame in
         * @param frameTitle
         *            The title to assign to the newly created Frame (can be NULL).
         * @return The newly created Frame.
         */
        public static synchronized Frame CreateFrame(String frameset,
                        String frameTitle, String templateFrame) throws RuntimeException {

                if (!FrameIO.isValidFramesetName(frameset)) {
                        throw new RuntimeException(frameset
                                        + " is not a valid frameset name");
                }

                int next = -1;

                // disable caching of 0 frames
                // Mike says: Why is caching of 0 frames being disabled?
                /*
                 * Especially since 0 frames are not event put into the cache in the
                 * frist place
                 */
                // SuspendCache();
                /*
                 * Suspending the cache causes infinate loops when trying to load a zero
                 * frame which has a ao which contains an v or av which contains a link
                 * to the ao frame
                 */

                String zeroFrameName = frameset + "0";
                Frame destFramesetZero = LoadFrame(zeroFrameName);
                if (destFramesetZero == null) {
                        throw new RuntimeException(zeroFrameName + " could not be found");
                }

                Frame template = null;
                if (templateFrame == null) {
                        // load in frame.0
                        template = destFramesetZero;
                } else {
                        template = LoadFrame(templateFrame);
                        if (template == null) {
                                throw new RuntimeException("LinkTemplate " + templateFrame
                                                + " could not be found");
                        }
                }

                ResumeCache();

                // read the next number from the INF file
                try {
                        next = ReadINF(destFramesetZero.getPath(), frameset, true);
                } catch (IOException ioe) {
                        ioe.printStackTrace();
                        throw new RuntimeException("INF file could not be read");
                }

                // Remove the old frame from the cache then add the new one
                // TODO figure out some way that we can put both in the cache
                _Cache.remove(template.getName().toLowerCase());
                // set the number and title of the new frame
                template.setName(frameset, ++next);
                template.setTitle(frameTitle);
                // _Cache.put(template.getName().toLowerCase(), template);

                Logger.Log(Logger.SYSTEM, Logger.TDFC, "Creating new frame: "
                                + template.getName() + " from TDFC");

                template.setOwner(UserSettings.UserName.get());
                template.reset();
                template.resetDateCreated();

                for (Item i : template.getSortedItems()) {
                        if (ItemUtils.startsWithTag(i, ItemUtils.TAG_PARENT)) {
                                i.setLink(null);
                        }
                }

                // do auto shrinking of the title IF not in twin frames mode and the title is not centred
                Item titleItem = template.getTitleItem();
                if (titleItem == null) {
                        return template; 
                }
                
                boolean titleItemJustified = titleItem == null || !Justification.center.equals(((Text)titleItem).getJustification());
                if (!DisplayController.isTwinFramesOn() && titleItemJustified) {
                        if ((titleItem.getX() + 1) < template.getNameItem().getX()) {
                                int title_item_xr = titleItem.getX() + titleItem.getBoundsWidth(); // should really be '... -1'
                                int frame_name_xl = template.getNameItem().getX();
                                if (frame_name_xl < DisplayController.MINIMUM_FRAME_WIDTH) {
                                        frame_name_xl = DisplayController.MINIMUM_FRAME_WIDTH;
                                }
                                
                                while ((titleItem.getSize() > Text.MINIMUM_FONT_SIZE) && title_item_xr > frame_name_xl) {
                                        titleItem.setSize(titleItem.getSize() - 1);
                                        System.err.println("**** shrunk titleItem: " + titleItem + " to font size: " + titleItem.getSize());
                                }
                        } else {
                                System.out.println("Bad title x position: " + titleItem.getX());
                        }
                }
                // Assign a width to the title.
                titleItem.setRightMargin(template.getNameItem().getX(), true);

                return template;
        }

        public static void DisableCache() {
                //System.err.println(" --------- Cache Disabled --------- ");
                _UseCache = false;
        }

        public static void EnableCache() {
                //System.err.println(" --------- Cache Enabled --------- ");
                _UseCache = true;
        }

        public static void SuspendCache() {
                //System.err.println("SuspendCache: _UseCache" + " was " + _UseCache);
                if (_UseCache) {
                        DisableCache();
                        _SuspendedCache = true;
                } else {
                        _SuspendedCache = false;
                }
                //System.err.println("   Cache is suspended -> " + _SuspendedCache);
                //System.err.println("   _UseCache is -> " + _UseCache);
                //System.err.println();
        }

        public static void ResumeCache() {
                //System.err.println("ResumeCache: _UseCache" + " was " + _UseCache);
                if (_SuspendedCache) {
                        EnableCache();
                        _SuspendedCache = false;
                }
                //System.err.println("   Cache is suspended -> " + _SuspendedCache);
                //System.err.println("   _UseCache is -> " + _UseCache);
                //System.err.println();
        }

        public static void RefreshCacheImages()
        {
                SuspendCache();
                for (Frame frame : _Cache.values()) {
                        frame.setBuffer(null);
                }
                ResumeCache();
        }

        /**
         * Creates a new frameset using the given name. This includes creating a new
         * subdirectory in the <code>FRAME_PATH</code> directory, Copying over the
         * default.0 frame from the default frameset, copying the .0 Frame to make a
         * .1 Frame, and creating the frameset's INF file.
         * 
         * @param frameset
         *            The name of the Frameset to create
         * @return The first Frame of the new Frameset (Frame.1)
         */
        public static Frame CreateFrameset(String frameset, String path)
                        throws Exception {
                return CreateFrameset(frameset, path, false);
        }

        /**
         * Tests if the given String is a 'proper' framename, that is, the String
         * must begin with a character, end with a number with 0 or more letters and
         * numbers in between.
         * 
         * @param frameName
         *            The String to test for validity as a frame name
         * @return True if the given framename is proper, false otherwise.
         */
        public static boolean isValidFrameName(String frameName) {

                if (frameName == null || frameName.length() < 2) {
                        return false;
                }

                int lastCharIndex = frameName.length() - 1;
                // String must begin with a letter and end with a digit
                if (!Character.isLetter(frameName.charAt(0))
                                || !Character.isDigit(frameName.charAt(lastCharIndex))) {
                        return false;
                }

                // All the characters between first and last must be letters
                // or digits
                for (int i = 1; i < lastCharIndex; i++) {
                        if (!isValidFrameNameChar(frameName.charAt(i))) {
                                return false;
                        }
                }
                return true;
        }

        private static boolean isValidFrameNameChar(char c) {
                return c == '-' || c == '.' || Character.isLetterOrDigit(c);
        }

        /**
         * Saves the given Frame to disk in the corresponding frameset directory.
         * This is the same as calling SaveFrame(toSave, true)
         * 
         * @param toSave
         *            The Frame to save to disk
         */
        public static String SaveFrame(Frame toSave) {
                return SaveFrame(toSave, true);
        }

        /**
         * Saves a frame.
         * 
         * @param toSave
         *            the frame to save
         * @param inc
         *            true if the frames counter should be incremented
         * @return the text content of the frame
         */
        public static String SaveFrame(Frame toSave, boolean inc) {
                return SaveFrame(toSave, inc, true);
        }

        /**
         * Saves the given Frame to disk in the corresponding frameset directory, if
         * inc is true then the saved frames counter is incremented, otherwise it is
         * untouched.
         * 
         * @param toSave
         *              The Frame to save to disk
         * @param inc
         *              True if the saved frames counter should be incremented, false otherwise.
         * @param checkBackup
         *              True if the frame should be checked for the back up tag
         */
        public static String SaveFrame(Frame toSave, boolean inc, boolean checkBackup) {
                // TODO When loading a frame maybe append onto the event history too-
                // with a break to indicate the end of a session
                
                if (toSave == null || !toSave.hasChanged() || toSave.isSaved()) {
                        return "";
                }

                // Dont save if the frame is protected and it exists
                if (checkBackup && toSave.isReadOnly()) {
                        _Cache.remove(toSave.getName().toLowerCase());
                        return "";
                }

                /* Dont save the frame if it has the noSave tag */
                if (toSave.hasAnnotation("nosave")) {
                        Actions.LegacyPerformActionCatchErrors(toSave, null, "Restore");
                        return "";
                }

                // Save frame that is not local through the Networking classes
                if (!toSave.isLocal()) {
                        return FrameShare.getInstance().saveFrame(toSave);
                }

                /* Format the frame if it has the autoFormat tag */
                if (toSave.hasAnnotation("autoformat")) {
                        Actions.LegacyPerformActionCatchErrors(toSave, null, "Format");
                }

                /**
                 * Get the full path only to determine which format to use for saving
                 * the frame. At this stage use Exp format for saving Exp frames only.
                 * Later this will be changed so that KMS frames will be updated to the
                 * Exp format.
                 */
                String fullPath = getFrameFullPathName(toSave.getPath(), toSave
                                .getName());

                // Check if the frame exists
                if (checkBackup && fullPath == null) {
                        // The first time a frame with the backup tag is saved, dont back it
                        // up
                        checkBackup = false;
                }

                FrameWriter writer = null;
                int savedVersion;
                try {
                        // if its a new frame or an existing Exp frame...
                        if (fullPath == null || fullPath.endsWith(ExpReader.EXTENTION)) {                               
                                if (toSave.getNumber() != AuthenticatorBrowser.CREDENTIALS_FRAME && 
                                                toSave.getEncryptionLabel() != null) {
                                        writer = new EncryptedExpWriter(toSave.getEncryptionLabel());
                                        savedVersion = EncryptedExpReader.getVersion(fullPath);
                                } else {
                                        writer = new ExpWriter();
                                        savedVersion = ExpReader.getVersion(fullPath);
                                }
                                
                                // Is the file this would be saved to a redirect?
                                String redirectTo = ExpReader.redirectTo(fullPath);
                                if (redirectTo != null) {
                                        String redirectedPath = toSave.getFramePathReal();
                                        writer.setOutputLocation(redirectedPath);
                                }
                                
                        } else {
                                writer = new KMSWriter();
                                savedVersion = KMSReader.getVersion(fullPath);
                        }
                        
                        // Check if the frame doesnt exist
                        // if (savedVersion < 0) {
                        // /*
                        // * This will happen if the user has two Expeditee's running at
                        // * once and closes the first. When the second one closes the
                        // * messages directory will have been deleted.
                        // */
                        // MessageBay
                        // .errorMessage("Could not save frame that does not exist: "
                        // + toSave.getName());
                        // return null;
                        // }

                        // Check if we are trying to save an out of date version
                        // Q:   Why do we ignore version conflicts if the saved version is zero?
                        // A:   Sometimes a Frame object in memory with a specified path is not 'connected' 
                        //              to the file found at that specified path yet.  This occurs if a frame object
                        //              has been created, its path assigned and saved to disk; with the intention 
                        //              discarding this Frame object and later saving a different Frame object to 
                        //              that File.  One example of this is when @old frames are created.
                        //              The new Frame object that is created and saved only to be discarded, has a
                        //              version number of zero.  
                        //              Therefore, if the file created from the discarded Frame has its modification
                        //              date compared to the modification date on the Frame object that will eventually
                        //              be used to overwrite that file, it causes a false positive conflict.  Checking
                        //              for the zero version number fixes this.
                        String framesetName = toSave.getFramesetName();
                        boolean isBayFrameset = 
                                        framesetName.equalsIgnoreCase(MessageBay.MESSAGES_FRAMESET_NAME) || 
                                        framesetName.equalsIgnoreCase(MailBay.EXPEDITEE_MAIL_FRAMESET_NAME);
                        long fileLastModify = fullPath != null ? new File(fullPath).lastModified() : 0;
                        long frameLastModify = toSave.getLastModifyPrecise();
                        boolean fileModifyConflict = fileLastModify > frameLastModify && !isBayFrameset;
                        boolean versionConflict = savedVersion > toSave.getVersion() && !isBayFrameset;
                        if ((fileModifyConflict || versionConflict) && savedVersion > 0) {
                                // remove this frame from the cache if it is there
                                // This will make sure links to the original are set correctly
                                _Cache.remove(toSave.getName().toLowerCase());
                                int nextnum = ReadINF(toSave.getPath(), toSave
                                                .getFramesetName(), false) + 1;
                                SuspendCache();
                                Frame original = LoadFrame(toSave.getName());
                                toSave.setFrameNumber(nextnum);
                                ResumeCache();
                                // Put the modified version in the cache
                                addToCache(toSave);
                                // Show the messages alerting the user
                                Text originalMessage = new Text(-1);
                                originalMessage.setColor(MessageBay.ERROR_COLOR);
                                StringBuilder message = new StringBuilder(original.getName()
                                                + " was updated by another user. ");
                                if (fileModifyConflict) {
                                        message.append("{ File modify conflict }");
                                        System.err.println("Thread name: " + Thread.currentThread().getName());
                                        StackTraceElement[] stackTrace = Thread.currentThread().getStackTrace();
                                        for (StackTraceElement ste: stackTrace) {
                                                System.err.println(ste.toString());
                                        }
                                }
                                if (versionConflict) {
                                        message.append("{ Version conflict }");
                                }
                                originalMessage.setText(message.toString());
                                originalMessage.setLink(original.getName());
                                Text yourMessage = new Text(-1);
                                yourMessage.setColor(MessageBay.ERROR_COLOR);
                                yourMessage.setText("Your version was renamed "
                                                + toSave.getName());
                                yourMessage.setLink(toSave.getName());
                                MessageBay.displayMessage(originalMessage);
                                MessageBay.displayMessage(yourMessage);
                                EcosystemManager.getMiscManager().beep();
                        } else if (checkBackup
                                        && ItemUtils.ContainsExactTag(toSave.getSortedItems(),
                                                        ItemUtils.TAG_BACKUP)) {
                                SuspendCache();
                                String oldFramesetName = toSave.getFramesetName() + "-old";

                                Frame original = LoadFrame(toSave.getName());
                                if (original == null) {
                                        original = toSave;
                                }
                                int orignum = original.getNumber();

                                int nextnum = -1;
                                try {
                                        nextnum = ReadINF(toSave.getPath(), oldFramesetName, false) + 1;
                                } catch (RuntimeException e) {
                                        try {
                                                CreateFrameset(oldFramesetName, toSave.getPath());
                                                nextnum = 1;
                                        } catch (Exception e1) {
                                                e1.printStackTrace();
                                        }
                                }

                                if (nextnum > 0) {
                                        original.setFrameset(oldFramesetName);
                                        original.setFrameNumber(nextnum);
                                        original.setPermission(new PermissionTriple(UserAppliedPermission.copy));
                                        original.change();
                                        SaveFrame(original, false, false);
                                }

                                Item i = ItemUtils.FindExactTag(toSave.getSortedItems(),
                                                ItemUtils.TAG_BACKUP);
                                i.setLink(original.getName());
                                toSave.setFrameNumber(orignum);
                                ResumeCache();
                        }

                        // int oldMode = FrameGraphics.getMode();
                        // if (oldMode != FrameGraphics.MODE_XRAY)
                        // FrameGraphics.setMode(FrameGraphics.MODE_XRAY, true);
                        
                        writer.writeFrame(toSave);
                        // FrameGraphics.setMode(oldMode, true);
                        toSave.setSaved();
                        
                        // Update general stuff about frame
                        setSavedProperties(toSave);
                        
                        if (inc) {
                                SessionStats.SavedFrame(toSave.getName());
                        }

                        // avoid out-of-sync frames (when in TwinFrames mode)
                        if (_Cache.containsKey(toSave.getName().toLowerCase())) {
                                addToCache(toSave);
                        }

                        Logger.Log(Logger.SYSTEM, Logger.SAVE, "Saving " + toSave.getName()
                                        + " to disk.");

                        // check that the INF file is not out of date
                        int last = ReadINF(toSave.getPath(), toSave.getFramesetName(),
                                        false);
                        if (last <= toSave.getNumber()) {
                                WriteINF(toSave.getPath(), toSave.getFramesetName(), toSave
                                                .getName());
                        }

                        // check if this was the profile frame (and thus needs
                        // re-parsing)
                        if (isProfileFrame(toSave)) {
                                Frame profile = FrameIO.LoadFrame(toSave.getFramesetName() + "1");
                                assert (profile != null);
                                FrameUtils.ParseProfile(profile);
                        }
                } catch (IOException ioe) {
                        ioe.printStackTrace();
                        ioe.getStackTrace();
                        Logger.Log(ioe);
                        return null;
                }
                toSave.notifyObservers(false);

                return writer.getFileContents();
        }

        /**
         * Saves the given Frame to disk in the corresponding frameset directory as a RESTORE, if
         * inc is true then the saved frames counter is incremented, otherwise it is
         * untouched.
         * 
         * @param toSave
         *            The Frame to save to disk as the DEFAULT COPY
         * @param inc
         *            True if the saved frames counter should be incremented, false
         *            otherwise.
         * @param checkBackup
         *            True if the frame should be checked for the back up tag
         */
        public static String SaveFrameAsRestore(Frame toSave, boolean inc,
                        boolean checkBackup) {
                
                String sf = SaveFrame(toSave, inc, checkBackup);                
                String fullPath = getFrameFullPathName(toSave.getPath(), toSave
                                .getName());
                //System.out.println(fullPath);
                String restoreVersion = fullPath + ".restore";
                File source = new File(fullPath);
                File dest = new File(restoreVersion);
                
                FileChannel inputChannel = null;
                FileChannel outputChannel = null;
                
                try{
                                FileInputStream source_fis = new FileInputStream(source);
                                inputChannel = source_fis.getChannel();
                                
                                FileOutputStream dest_fos = new FileOutputStream(dest);
                                outputChannel = dest_fos.getChannel();
                                
                                outputChannel.transferFrom(inputChannel, 0, inputChannel.size());
                                inputChannel.close();
                                outputChannel.close();
                                source_fis.close();
                                dest_fos.close();
                }                
                catch(Exception e){
                        e.printStackTrace();
                }                       
                
                return sf;
        }
        
        /**
         * @param toAdd
         */
        public static void addToCache(Frame toAdd) {
                _Cache.put(toAdd.getName().toLowerCase(), toAdd);
        }
        
        public static void ClearCache() {
                _Cache.clear();
        }

        /**
         * Checks if a frame is in the current user profile frameset.
         * 
         * @param toCheck
         *            the frame to check
         * @return true if the frame is in the current user profile frameset
         */
        public static boolean isProfileFrame(Frame toCheck)
        {
                if (toCheck.getNumber() == 0) {
                        return false;
                }
                
                return toCheck.getPath().equals(PROFILE_PATH);
                // return toCheck.getFramesetName()
                // .equalsIgnoreCase(UserSettings.ProfileName);
        }

        public static Frame LoadProfile(String userName)
        {
                final String profilesLoc = System.getProperty("profiles.loc");
                if (profilesLoc != null) {
                        return LoadFrame(userName + "1", profilesLoc);
                } else {
                        return LoadFrame(userName + "1");
                }
        }

        public static Frame CreateNewProfile(String username, Map<String, Setting> initialSettings, Map<String, Consumer<Frame>> toNotifyOnSet) throws InvalidFramesetNameException, ExistingFramesetException {
                Frame profile = CreateFrameset(username, PROFILE_PATH, true);
                if (profile != null) {
                        FrameUtils.CreateDefaultProfile(username, profile, initialSettings, toNotifyOnSet);
                } else {
                        System.err.println("An error occured while attempting to create the profile named: " + username);
                        System.err.println("Unable to proceed.");
                        System.exit(1);
                }
                return profile;
        }

        /**
         * Reads the INF file that corresponds to the given Frame name
         * 
         * @param framename
         *            The Frame to lookup the INF file for
         * @throws IOException
         *             Any exceptions encountered by the BufferedReader used to read
         *             the INF.
         */
        public static int ReadINF(String path, String frameset, boolean update)
                        throws IOException {
                assert (!frameset.endsWith("."));
                try {
                        // read INF
                        BufferedReader reader;
                        try {
                                // Check on the local drive
                                reader = new BufferedReader(new FileReader(path
                                                + frameset.toLowerCase() + File.separator
                                                + INF_FILENAME));
                        } catch (Exception e) {
                                reader = new BufferedReader(new FileReader(path
                                                + frameset.toLowerCase() + File.separator
                                                + frameset.toLowerCase() + ".inf"));
                        }
                        String inf = reader.readLine();
                        reader.close();

                        int next = Conversion.getFrameNumber(inf);
                        // update INF file
                        if (update) {
                                try {
                                        WriteINF(path, frameset, frameset + (next + 1));
                                } catch (IOException ioe) {
                                        ioe.printStackTrace();
                                        Logger.Log(ioe);
                                }
                        }
                        return next;
                } catch (Exception e) {
                }

                // Check peers
                return FrameShare.getInstance().getInfNumber(path, frameset, update);
        }

        /**
         * Writes the given String out to the INF file corresponding to the current
         * frameset.
         * 
         * @param toWrite
         *            The String to write to the file.
         * @throws IOException
         *             Any exception encountered by the BufferedWriter.
         */
        public static void WriteINF(String path, String frameset, String frameName)
                        throws IOException {
                try {
                        assert (!frameset.endsWith("."));

                        path += frameset.toLowerCase() + File.separator + INF_FILENAME;

                        BufferedWriter writer = new BufferedWriter(new FileWriter(path));
                        writer.write(frameName);
                        writer.close();
                } catch (Exception e) {

                }
        }

        public static boolean FrameIsCached(String name) {
                return _Cache.containsKey(name);
        }

        /**
         * Gets a frame from the cache.
         * 
         * @param name
         *            The frame to get from the cache
         * 
         * @return The frame from cache. Null if not cached.
         */
        public static Frame FrameFromCache(String name) {
                return _Cache.get(name);
        }

        public static String ConvertToValidFramesetName(String toValidate) {
                assert (toValidate != null && toValidate.length() > 0);

                StringBuffer result = new StringBuffer();

                if (Character.isDigit(toValidate.charAt(0))) {
                        result.append(FRAME_NAME_LAST_CHAR);
                }

                boolean capital = false;
                for (int i = 0; i < toValidate.length()
                                && result.length() < MAX_NAME_LENGTH; i++) {
                        char cur = toValidate.charAt(i);

                        // capitalize all characters after spaces
                        if (Character.isLetterOrDigit(cur)) {
                                if (capital) {
                                        capital = false;
                                        result.append(Character.toUpperCase(cur));
                                } else {
                                        result.append(cur);
                                }
                        } else {
                                capital = true;
                        }
                }
                assert (result.length() > 0);
                int lastCharIndex = result.length() - 1;
                if (!Character.isLetter(result.charAt(lastCharIndex))) {
                        if (lastCharIndex == MAX_NAME_LENGTH - 1) {
                                result.setCharAt(lastCharIndex, FRAME_NAME_LAST_CHAR);
                        } else {
                                result.append(FRAME_NAME_LAST_CHAR);
                        }
                }

                assert (isValidFramesetName(result.toString()));
                return result.toString();
        }

        public static Frame CreateNewFrame(Item linker) throws RuntimeException {
                String title = linker.getName();

                String templateLink = linker.getAbsoluteLinkTemplate();
                String framesetLink = linker.getAbsoluteLinkFrameset();
                String frameset = (framesetLink != null ? framesetLink : DisplayController
                                .getCurrentFrame().getFramesetName());

                Frame newFrame = FrameIO.CreateFrame(frameset, title, templateLink);
                return newFrame;
        }
        
        public static Frame CreateNewFrame(Item linker, OnNewFrameAction action) throws RuntimeException {
            Frame newFrame = FrameIO.CreateNewFrame(linker);
            if(action != null) {
                        action.exec(linker, newFrame);
                }
            return newFrame;
        }

        /**
         * Creates a new Frameset on disk, including a .0, .1, and .inf files. The
         * Default.0 frame is copied to make the initial .0 and .1 Frames
         * 
         * @param name
         *            The Frameset name to use
         * @return The name of the first Frame in the newly created Frameset (the .1
         *         frame)
         */
        public static Frame CreateNewFrameset(String name) throws Exception {
                String path = DisplayController.getCurrentFrame().getPath();

                // if current frameset is profile directory change it to framesets
                if (path.equals(FrameIO.PROFILE_PATH)) {
                        path = FrameIO.FRAME_PATH;
                }

                Frame newFrame = FrameIO.CreateFrameset(name, path);

                if (newFrame == null) {
                        // Cant create directories if the path is readonly or there is no
                        // space available
                        newFrame = FrameIO.CreateFrameset(name, FrameIO.FRAME_PATH);
                }

                if (newFrame == null) {
                        // TODO handle running out of disk space here
                }

                return newFrame;
        }
        
        public static Frame CreateNewGroup(String name) {
                try {
                        Frame oneFrame = FrameIO.CreateFrameset(name, FrameIO.GROUP_PATH);
                        oneFrame.setPermission(new PermissionTriple(UserAppliedPermission.full, UserAppliedPermission.none, UserAppliedPermission.none));
                        
                        Text ownerAnnotation = oneFrame.createNewText("@Owner: " + UserSettings.UserName.get());
                        ownerAnnotation.setPosition(100, 100);
                        ownerAnnotation.setPermission(new PermissionTriple(UserAppliedPermission.full, UserAppliedPermission.none, UserAppliedPermission.none));
                        Text membersAnnotation = oneFrame.createNewText("@Members: ");
                        membersAnnotation.setPosition(100, 200);
                        
                        FrameIO.SaveFrame(oneFrame);
                        
                        FrameIO.LoadFrame(name + 0, FrameIO.GROUP_PATH).setPermission(new PermissionTriple(UserAppliedPermission.full, UserAppliedPermission.none, UserAppliedPermission.none));
                        
                        return oneFrame;
                } catch (Exception e) {
                        MessageBay.displayMessage("Unable to create group with name: " + name + ".  See console for more details.");
                        e.printStackTrace();
                        return null;
                }               
        }

        /**
         * 
         * @param frameset
         * @return
         */
        public static int getLastNumber(String frameset) { // Rob thinks it might
                // have been
                // GetHighestNumExFrame
                // TODO minimise the number of frames being read in!!
                int num = -1;

                Frame zero = LoadFrame(frameset + "0");

                // the frameset does not exist (or has no 0 frame)
                if (zero == null) {
                        return -1;
                }

                try {
                        num = ReadINF(zero.getPath(), frameset, false);
                } catch (IOException e) {
                        // TODO Auto-generated catch block
                        // e.printStackTrace();
                }

                /*
                 * Michael doesnt think the code below is really needed... it will just
                 * slow things down when we are reading frames over a network***** for (;
                 * num >= 0; num--) { System.out.println("This code is loading frames to
                 * find the highest existing frame..."); if (LoadFrame(frameset + num) !=
                 * null) break; }
                 */

                return num;
        }

        /**
         * Checks if a given frameset is accessable.
         * 
         * @param framesetName
         * @return
         */
        public static boolean canAccessFrameset(String framesetName) {
                framesetName = framesetName.toLowerCase();
                for (String path : FolderSettings.FrameDirs.getAbsoluteDirs()) {
                        if (canAccessFrameset(framesetName, Paths.get(path))) {
                                return true;
                        }
                }
                return false;
        }
        
        public static boolean canAccessFrameset(String framesetName, Path path) {
                File framesetDir = path.resolve(framesetName).toFile();
                if (framesetDir.exists() && framesetDir.isDirectory()) {
                        return true;
                } else {
                        return false;
                }
        }

        public static Frame CreateFrameset(String frameset, String path, boolean recreate) throws InvalidFramesetNameException, ExistingFramesetException {
                String conversion = frameset + " --> ";

                if (!isValidFramesetName(frameset)) {
                        throw new InvalidFramesetNameException(frameset);
                }

                if (!recreate && FrameIO.canAccessFrameset(frameset)) {
                        throw new ExistingFramesetException(frameset);
                }

                conversion += frameset;
                Logger.Log(Logger.SYSTEM, Logger.NEW_FRAMESET, "Frameset Name: "
                                + conversion);
                conversion = frameset;

                /**
                 * TODO: Update this to exclude any\all invalid filename characters
                 */
                // ignore annotation character
                if (frameset.startsWith("@")) {
                        frameset = frameset.substring(1);
                }

                conversion += " --> " + frameset;
                Logger.Log(Logger.SYSTEM, Logger.NEW_FRAMESET, "Name: " + conversion);

                // create the new Frameset directory
                File dir = new File(path + frameset.toLowerCase() + File.separator);

                // If the directory doesnt already exist then create it...
                if (!dir.exists()) {
                        if (!dir.mkdirs()) {
                                /*
                                 * If the directory does not exist, but could not be created then there is something wrong.
                                 * Prior to May 2019 the only known reason for this was because the disk could be full.
                                 * Since then, we have discovered that null can occur when working with Google file stream.
                                 * A directory can return false to an existence check, but then fail to create the directory
                                 * due to it already existing because of sync issues.  While we have not confirmed, this may
                                 * be the case with other network drives as well.
                                 */
                                System.err.println("Failed to create directory for frameset: " + frameset);
                                return null;
                        }
                }

                // create the new INF file
                try {
                        WriteINF(path, frameset, frameset + '1');
                } catch (IOException ioe) {
                        ioe.printStackTrace();
                        Logger.Log(ioe);
                }

                SuspendCache();
                // copy the default .0 and .1 files
                Frame base = null;
                try {
                        base = LoadFrame(TemplateSettings.DefaultFrame.get());
                } catch (Exception e) {
                }
                // The frame may not be accessed for various reasons... in all these
                // cases just create a new one
                if (base == null) {
                        base = new Frame();
                }

                ResumeCache();

                base.reset();
                base.resetDateCreated();
                base.setFrameset(frameset);
                base.setFrameNumber(0);
                base.setTitle(base.getFramesetName() + "0");
                base.setPath(path);
                base.change();
                base.setOwner(UserSettings.UserName.get());
                SaveFrame(base, false);

                base.reset();
                base.resetDateCreated();
                base.setFrameNumber(1);
                base.setTitle(frameset);
                base.change();
                base.setOwner(UserSettings.UserName.get());
                SaveFrame(base, true);
                
                FrameIO.setSavedProperties(base);

                Logger.Log(Logger.SYSTEM, Logger.NEW_FRAMESET, "Created new frameset: " + frameset);

                return base;
        }

        /**
         * Tests if a frameset name is valid. That is it must begin and end with a
         * letter and contain only letters and digits in between.
         * 
         * @param frameset
         *            the name to be tested
         * @return true if the frameset name is valid
         */
        public static boolean isValidFramesetName(String frameset) {
                if (frameset == null) {
                        return false;
                }

                int nameLength = frameset.length();
                if (frameset.length() <= 0 || nameLength > MAX_NAME_LENGTH) {
                        return false;
                }

                int lastCharIndex = nameLength - 1;

                if (!Character.isLetter(frameset.charAt(0))
                                || !Character.isLetter(frameset.charAt(lastCharIndex))) {
                        return false;
                }

                for (int i = 1; i < lastCharIndex; i++) {
                        if (!isValidFrameNameChar(frameset.charAt(i))) {
                                return false;
                        }
                }
                return true;
        }

        public static boolean deleteFrameset(String framesetName) {
                return moveFrameset(framesetName, FrameIO.TRASH_PATH, true);
        }

        public static boolean moveFrameset(String framesetName, String destinationFolder, boolean override) {
                if (!FrameIO.canAccessFrameset(framesetName)) {
                        return false;
                }
                // Clear the cache
                _Cache.clear();

                // Search all the available directories for the directory
                for (String path : FolderSettings.FrameDirs.getAbsoluteDirs()) {
                        return moveFrameset(framesetName, path, destinationFolder, override);
                }
                return false;
        }

        public static boolean moveFrameset(String framesetName, String path, String destinationFolder, boolean override) {
                String source = path + framesetName.toLowerCase() + File.separator;
                File framesetDirectory = new File(source);
                // Once we have found the directory move it
                if (framesetDirectory.exists()) {
                        String destPath = destinationFolder
                                        + framesetName.toLowerCase();
                        int copyNumber = 1;
                        File dest = new File(destPath + File.separator);
                        // Create the destination folder if it doesnt already exist
                        if (!dest.getParentFile().exists()) {
                                dest.mkdirs();
                        }
                        // If a frameset with the same name is already in the
                        // destination add
                        // a number to the end
                        while (dest.exists() && !override) {
                                dest = new File(destPath + ++copyNumber + File.separator);
                        }
                        try {
                                moveFileTree(framesetDirectory.toPath(), dest.toPath());        
                        } catch (IOException e) {
                                e.printStackTrace();
                                return false;
                        }
                        
                        for (File f : framesetDirectory.listFiles()) {
                                if (!f.delete()) {
                                        return false;
                                }
                        }
                        if (!framesetDirectory.delete()) {
                                return false;
                        }
                        return true;
                } else {
                        return false;
                }
        }

        public static boolean CopyFrameset(String framesetToCopy,
                        String copiedFrameset) throws Exception {
                if (!FrameIO.canAccessFrameset(framesetToCopy)) {
                        return false;
                }
                if (FrameIO.canAccessFrameset(copiedFrameset)) {
                        return false;
                }
                // search through all the directories to find the frameset we are
                // copying
                for (String path : FolderSettings.FrameDirs.getAbsoluteDirs()) {
                        String source = path + framesetToCopy.toLowerCase()
                                        + File.separator;
                        File framesetDirectory = new File(source);
                        if (framesetDirectory.exists()) {
                                // copy the frameset
                                File copyFramesetDirectory = new File(path
                                                + copiedFrameset.toLowerCase() + File.separator);
                                if (!copyFramesetDirectory.mkdirs()) {
                                        return false;
                                }
                                // copy each of the frames
                                for (File f : framesetDirectory.listFiles()) {
                                        // Ignore hidden files
                                        if (f.getName().charAt(0) == '.') {
                                                continue;
                                        }
                                        String copyPath = copyFramesetDirectory.getAbsolutePath()
                                                        + File.separator + f.getName();
                                        FrameIO.copyFile(f.getAbsolutePath(), copyPath);
                                }
                                return true;
                        }
                }
                return false;
        }

        /**
         * Copies a file from one location to another.
         * 
         * @param existingFile
         * @param newFileName
         * @throws Exception
         */
        public static void copyFile(String existingFile, String newFileName)
                        throws IOException {
                FileInputStream is = new FileInputStream(existingFile);
                FileOutputStream os = new FileOutputStream(newFileName, false);
                int data;
                while ((data = is.read()) != -1) {
                        os.write(data);
                }
                os.flush();
                os.close();
                is.close();
        }

        /**
         * Saves a frame regardless of whether or not the frame is marked as having
         * been changed.
         * 
         * @param frame
         *            the frame to save
         * @return the contents of the frame or null if it could not be saved
         */
        public static String ForceSaveFrame(Frame frame) {
                frame.change();
                return SaveFrame(frame, false);
        }

        public static boolean isValidLink(String frameName) {
                return frameName == null || isPositiveInteger(frameName)
                                || isValidFrameName(frameName);
        }

        public static void SavePublicFrame(String peerName, String frameName,
                        int version, BufferedReader packetContents) {
                // TODO handle versioning - add version to the header
                // Remote user uploads version based on an old version

                // Remove it from the cache so that next time it is loaded we get the up
                // todate version
                _Cache.remove(frameName.toLowerCase());

                // Save to file
                String filename = PUBLIC_PATH + Conversion.getFramesetName(frameName)
                                + File.separator + Conversion.getFrameNumber(frameName)
                                + ExpReader.EXTENTION;

                File file = new File(filename);
                // Ensure the file exists
                if (file.exists()) {
                        // Check the versions
                        int savedVersion = ExpReader.getVersion(filename);

                        if (savedVersion > version) {
                                // remove this frame from the cache if it is there
                                // This will make sure links to the original are set correctly
                                // _Cache.remove(frameName.toLowerCase());

                                int nextNum = 0;
                                try {
                                        nextNum = ReadINF(PUBLIC_PATH, Conversion
                                                        .getFramesetName(frameName), false) + 1;
                                } catch (IOException e) {
                                        e.printStackTrace();
                                }

                                String newName = Conversion.getFramesetName(frameName)
                                                + nextNum;
                                filename = PUBLIC_PATH + Conversion.getFramesetName(frameName)
                                                + File.separator + nextNum + ExpReader.EXTENTION;

                                // Show the messages alerting the user
                                Text originalMessage = new Text(-1);
                                originalMessage.setColor(MessageBay.ERROR_COLOR);
                                originalMessage.setText(frameName + " was edited by "
                                                + peerName);
                                originalMessage.setLink(frameName);
                                Text yourMessage = new Text(-1);
                                yourMessage.setColor(MessageBay.ERROR_COLOR);
                                yourMessage.setText("Their version was renamed " + newName);
                                yourMessage.setLink(newName);
                                MessageBay.displayMessage(originalMessage);
                                MessageBay.displayMessage(yourMessage);

                                Frame editedFrame = FrameIO.LoadFrame(frameName);

                                FrameShare.getInstance().sendMessage(
                                                frameName + " was recently edited by "
                                                                + editedFrame.getLastModifyUser(), peerName);
                                FrameShare.getInstance().sendMessage(
                                                "Your version was renamed " + newName, peerName);
                        }
                }

                // Save the new version
                try {
                        // FileWriter fw = new FileWriter(file);

                        // Open an Output Stream Writer to set encoding
                        OutputStream fout = new FileOutputStream(file);
                        OutputStream bout = new BufferedOutputStream(fout);
                        Writer fw = new OutputStreamWriter(bout, "UTF-8");

                        String nextLine = null;
                        while ((nextLine = packetContents.readLine()) != null) {
                                fw.write(nextLine + '\n');
                        }
                        fw.flush();
                        fw.close();
                        MessageBay.displayMessage("Saved remote frame: " + frameName);
                } catch (IOException e) {
                        MessageBay.errorMessage("Error remote saving " + frameName + ": "
                                        + e.getMessage());
                        e.printStackTrace();
                }
        }

        public static void setSavedProperties(Frame toSave) {
                toSave.setLastModifyDate(Formatter.getDateTime(), System.currentTimeMillis());
                toSave.setLastModifyUser(UserSettings.UserName.get());
                toSave.setVersion(toSave.getVersion() + 1);
                Time darkTime = new Time(SessionStats.getFrameDarkTime().getTime()
                                + toSave.getDarkTime().getTime());
                Time activeTime = new Time(SessionStats.getFrameActiveTime().getTime()
                                + toSave.getActiveTime().getTime());
                toSave.setDarkTime(darkTime);
                toSave.setActiveTime(activeTime);
        }
        
        public static boolean personalResourcesExist(String username) {
                Path personalResources = Paths.get(FrameIO.PARENT_FOLDER).resolve("resources-" + username);
                File personalResourcesFile = personalResources.toFile();
                boolean directoryExists = personalResourcesFile.exists() && personalResourcesFile.isDirectory();
                return directoryExists;
        }
        
        public static Path setupPersonalResources(String username) {
                Path personalResources = Paths.get(FrameIO.PARENT_FOLDER).resolve("resources-" + username);
                personalResources.toFile().mkdir();             
                File[] globalResourcesToCopy = Paths.get(FrameIO.RESOURCES_PRIVATE_PATH).toFile().listFiles();
                
                try {
                        for (File toCopy: globalResourcesToCopy) {
                                Path p = Paths.get(toCopy.getAbsolutePath());
                                if (!p.getFileName().toString().equals(".res") && !p.getFileName().toString().equals("about")) {
                                        moveFileTree(p.toAbsolutePath(), personalResources.resolve(p.getFileName()));
                                }
                        }
                } catch (IOException e) {
                        e.printStackTrace();
                        personalResources = null;
                }
                
                return personalResources;
        }
        
        public static void migrateFrame(Frame toMigrate, Path destinationDirectory) {
                Path source = Paths.get(toMigrate.getFramePathReal());
                String destination = source.relativize(destinationDirectory).toString().substring(3).replace(File.separator, "/");
                try {
                        Files.move(source, destinationDirectory);
                } catch (IOException e) {
                        System.err.println("FrameIO::migrateFrame: failed to migrate from to new location.  Message: " + e.getMessage());
                        return;
                }
                try {
                        FileWriter out = new FileWriter(source.toFile());
                        out.write("REDIRECT:" + destination);
                        out.flush();
                        out.close();
                } catch (IOException e) {
                        System.err.println("FrameIO::migrateFrame: failed to update file [" + source + "] to redirect to  [" + destination + "] following migration.  Message: " + e.getMessage());
                }
        }
        
        private static void moveFileTree(Path source, Path target) throws IOException {
                if (source.toFile().isDirectory()) {
                        if (!target.toFile().exists()) {
                                Files.copy(source, target);
                        }
                        File[] files = source.toFile().listFiles();
                        for (File file: files) {
                                Path asPath = Paths.get(file.getAbsolutePath());
                                moveFileTree(asPath, target.resolve(asPath.getFileName()));
                        }
                } else {
                        Files.copy(source, target, StandardCopyOption.REPLACE_EXISTING);
                }
        }
}