# -*- coding: utf-8 -*-
"""
novelWriter – Project Wrapper
=============================
Data class for novelWriter projects

File History:
Created: 2018-09-29 [0.0.1]

This file is a part of novelWriter
Copyright 2018–2021, Veronica Berglyd Olsen

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 <https://www.gnu.org/licenses/>.
"""

import nw
import logging
import os
import json
import shutil

from lxml import etree
from time import time
from functools import partial

from PyQt5.QtCore import QCoreApplication

from nw.core.tree import NWTree
from nw.core.item import NWItem
from nw.core.document import NWDoc
from nw.core.status import NWStatus
from nw.core.options import OptionState
from nw.common import (
    checkString, checkBool, checkInt, isHandle, formatTimeStamp,
    makeFileNameSafe, hexToInt
)
from nw.constants import (
    trConst, nwFiles, nwItemType, nwItemClass, nwItemLayout, nwLabels, nwAlert
)

logger = logging.getLogger(__name__)

class NWProject():

    def __init__(self, theParent):

        # Internal
        self.theParent = theParent
        self.mainConf  = nw.CONFIG

        # Core Elements
        self.optState = OptionState(self) # Project-specific GUI options
        self.projTree = NWTree(self)      # The project tree
        self.langData = {}                # Localisation data

        # Project Status
        self.projOpened  = 0     # The time stamp of when the project file was opened
        self.projChanged = False # The project has unsaved changes
        self.projAltered = False # The project has been altered this session
        self.lockedBy    = None  # Data on which computer has the project open
        self.saveCount   = 0     # Meta data: number of saves
        self.autoCount   = 0     # Meta data: number of automatic saves
        self.editTime    = 0     # The accumulated edit time read from the project file

        # Class Settings
        self.projPath    = None # The full path to where the currently open project is saved
        self.projMeta    = None # The full path to the project's meta data folder
        self.projCache   = None # The full path to the project's cache folder
        self.projContent = None # The full path to the project's content folder
        self.projDict    = None # The spell check dictionary
        self.projLang    = None # The spell check language, if different than default
        self.projFile    = None # The file name of the project main XML file

        # Project Meta
        self.projName    = "" # Project name (working title)
        self.bookTitle   = "" # The final title; should only be used for exports
        self.bookAuthors = [] # A list of book authors

        # Project Settings
        self.autoReplace = {}    # Text to auto-replace on exports
        self.titleFormat = {}    # The formatting of titles for exports
        self.spellCheck  = False # Controls the spellcheck-as-you-type feature
        self.autoOutline = True  # If true, the Project Outline is updated automatically
        self.statusItems = None  # Novel file progress status values
        self.importItems = None  # Note file importance values
        self.lastEdited  = None  # The handle of the last file to be edited
        self.lastViewed  = None  # The handle of the last file to be viewed
        self.lastWCount  = 0     # The project word count from last session
        self.currWCount  = 0     # The project word count in current session
        self.novelWCount = 0     # Total number of words in novel files
        self.notesWCount = 0     # Total number of words in note files
        self.doBackup    = True  # Run project backup on exit

        # Internal Mapping
        self.makeAlert = self.theParent.makeAlert
        self.tr = partial(QCoreApplication.translate, "NWProject")

        # Set Defaults
        self.clearProject()

        return

    ##
    #  Item Methods
    ##

    def newRoot(self, rootName, rootClass):
        """Add a new root item. These items are unique, except for item class
        CUSTOM, and always have parent handle set to None.
        """
        if not self.projTree.checkRootUnique(rootClass):
            self.makeAlert("Duplicate root item detected.", nwAlert.ERROR)
            return None
        newItem = NWItem(self)
        newItem.setName(rootName)
        newItem.setType(nwItemType.ROOT)
        newItem.setClass(rootClass)
        newItem.setStatus(0)
        self.projTree.append(None, None, newItem)
        return newItem.itemHandle

    def newFolder(self, folderName, folderClass, pHandle):
        """Add a new folder with a given name and class and parent item.
        """
        newItem = NWItem(self)
        newItem.setName(folderName)
        newItem.setType(nwItemType.FOLDER)
        newItem.setClass(folderClass)
        newItem.setStatus(0)
        self.projTree.append(None, pHandle, newItem)
        return newItem.itemHandle

    def newFile(self, fileName, fileClass, pHandle):
        """Add a new file with a given name and class, and set a default
        layout based on the class. SCENE for NOVEL, and otherwise NOTE.
        """
        newItem = NWItem(self)
        newItem.setName(fileName)
        newItem.setType(nwItemType.FILE)
        if fileClass == nwItemClass.NOVEL:
            newItem.setLayout(nwItemLayout.SCENE)
        else:
            newItem.setLayout(nwItemLayout.NOTE)
        newItem.setClass(fileClass)
        newItem.setStatus(0)
        self.projTree.append(None, pHandle, newItem)
        return newItem.itemHandle

    def trashFolder(self):
        """Add the special trash root folder to the project.
        """
        trashHandle = self.projTree.trashRoot()
        if trashHandle is None:
            newItem = NWItem(self)
            newItem.setName(self.tr("Trash"))
            newItem.setType(nwItemType.TRASH)
            newItem.setClass(nwItemClass.TRASH)
            self.projTree.append(None, None, newItem)
            return newItem.itemHandle

        return trashHandle

    ##
    #  Project Methods
    ##

    def clearProject(self):
        """Clear the data for the current project, and set them to
        default values.
        """
        # Project Status
        self.projOpened  = 0
        self.projChanged = False
        self.projAltered = False
        self.saveCount   = 0
        self.autoCount   = 0

        # Project Tree
        self.projTree.clear()

        # Project Settings
        self.projPath    = None
        self.projMeta    = None
        self.projCache   = None
        self.projContent = None
        self.projDict    = None
        self.projLang    = None
        self.projFile    = nwFiles.PROJ_FILE
        self.projName    = ""
        self.bookTitle   = ""
        self.bookAuthors = []
        self.autoReplace = {}
        self.titleFormat = {
            "title"      : r"%title%",
            "chapter"    : self.tr("Chapter")+r" %ch%: %title%",
            "unnumbered" : r"%title%",
            "scene"      : r"* * *",
            "section"    : r"",
        }
        self.spellCheck  = False
        self.autoOutline = True
        self.statusItems = NWStatus()
        self.statusItems.addEntry(self.tr("New"),      (100, 100, 100))
        self.statusItems.addEntry(self.tr("Note"),     (200, 50,  0))
        self.statusItems.addEntry(self.tr("Draft"),    (200, 150, 0))
        self.statusItems.addEntry(self.tr("Finished"), (50,  200, 0))
        self.importItems = NWStatus()
        self.importItems.addEntry(self.tr("New"),      (100, 100, 100))
        self.importItems.addEntry(self.tr("Minor"),    (200, 50,  0))
        self.importItems.addEntry(self.tr("Major"),    (200, 150, 0))
        self.importItems.addEntry(self.tr("Main"),     (50,  200, 0))
        self.lastEdited = None
        self.lastViewed = None
        self.lastWCount = 0
        self.currWCount = 0
        self.novelWCount = 0
        self.notesWCount = 0

        return

    def newProject(self, projData={}):
        """Create a new project by populating the project tree with a
        few starter items.
        """
        popMinimal = projData.get("popMinimal", True)
        popCustom = projData.get("popCustom", False)
        popSample = projData.get("popSample", False)

        # Check if we're extracting the sample project. This is handled
        # differently as it isn't actually a new project, so we forward
        # this to another function and return here.
        if popSample:
            return self.extractSampleProject(projData)

        # Project Settings
        projPath = projData.get("projPath", None)
        projName = projData.get("projName", self.tr("New Project"))
        projTitle = projData.get("projTitle", "")
        projAuthors = projData.get("projAuthors", "")

        if projPath is None:
            logger.error("No project path set for the new project")
            return False

        if not self.setProjectPath(projPath, newProject=True):
            return False

        self.setProjectName(projName)
        self.setBookTitle(projTitle)
        self.setBookAuthors(projAuthors)

        titlePage = "# %s\n\n" % (self.bookTitle if self.bookTitle else self.projName)
        if self.bookAuthors:
            titlePage = "%s%s %s\n" % (titlePage, self.tr("By"), self.getAuthors())

        # Document object for writing files
        aDoc = NWDoc(self, self.theParent)

        if popMinimal:
            # Creating a minimal project with a few root folders and a
            # single chapter folder with a single file.
            xHandle = {}
            xHandle[1] = self.newRoot(self.tr("Novel"),         nwItemClass.NOVEL)
            xHandle[2] = self.newRoot(self.tr("Plot"),          nwItemClass.PLOT)
            xHandle[3] = self.newRoot(self.tr("Characters"),    nwItemClass.CHARACTER)
            xHandle[4] = self.newRoot(self.tr("World"),         nwItemClass.WORLD)
            xHandle[5] = self.newFile(self.tr("Title Page"),    nwItemClass.NOVEL, xHandle[1])
            xHandle[6] = self.newFolder(self.tr("New Chapter"), nwItemClass.NOVEL, xHandle[1])
            xHandle[7] = self.newFile(self.tr("New Chapter"),   nwItemClass.NOVEL, xHandle[6])
            xHandle[8] = self.newFile(self.tr("New Scene"),     nwItemClass.NOVEL, xHandle[6])

            self.projTree.setFileItemLayout(xHandle[5], nwItemLayout.TITLE)
            self.projTree.setFileItemLayout(xHandle[7], nwItemLayout.CHAPTER)

            aDoc.openDocument(xHandle[5], showStatus=False)
            aDoc.saveDocument(titlePage)
            aDoc.clearDocument()

            aDoc.openDocument(xHandle[7], showStatus=False)
            aDoc.saveDocument("## %s\n\n" % self.tr("New Chapter"))
            aDoc.clearDocument()

            aDoc.openDocument(xHandle[8], showStatus=False)
            aDoc.saveDocument("### %s\n\n" % self.tr("New Scene"))
            aDoc.clearDocument()

        elif popCustom:
            # Create a project structure based on selected root folders
            # and a number of chapters and scenes selected in the
            # wizard's custom page.

            # Create root folders
            nHandle = self.newRoot(self.tr("Novel"), nwItemClass.NOVEL)
            for newRoot in projData.get("addRoots", []):
                if newRoot in nwItemClass:
                    self.newRoot(trConst(nwLabels.CLASS_NAME[newRoot]), newRoot)

            # Create a title page
            tHandle = self.newFile(self.tr("Title Page"), nwItemClass.NOVEL, nHandle)
            self.projTree.setFileItemLayout(tHandle, nwItemLayout.TITLE)

            aDoc.openDocument(tHandle, showStatus=False)
            aDoc.saveDocument(titlePage)
            aDoc.clearDocument()

            # Create chapters and scenes
            numChapters = projData.get("numChapters", 0)
            numScenes = projData.get("numScenes", 0)
            chFolders = projData.get("chFolders", False)

            # Create chapters
            if numChapters > 0:
                for ch in range(numChapters):
                    chTitle = self.tr("Chapter {0}").format(f"{ch+1:d}")
                    pHandle = nHandle
                    if chFolders:
                        pHandle = self.newFolder(chTitle, nwItemClass.NOVEL, nHandle)

                    cHandle = self.newFile(chTitle, nwItemClass.NOVEL, pHandle)
                    self.projTree.setFileItemLayout(cHandle, nwItemLayout.CHAPTER)

                    aDoc.openDocument(cHandle, showStatus=False)
                    aDoc.saveDocument("## %s\n\n" % chTitle)
                    aDoc.clearDocument()

                    # Create chapter scenes
                    if numScenes > 0:
                        for sc in range(numScenes):
                            scTitle = self.tr("Scene {0}").format(f"{ch+1:d}.{sc+1:d}")
                            sHandle = self.newFile(scTitle, nwItemClass.NOVEL, pHandle)

                            aDoc.openDocument(sHandle, showStatus=False)
                            aDoc.saveDocument("### %s\n\n" % scTitle)
                            aDoc.clearDocument()

            # Create scenes (no chapters)
            elif numScenes > 0:
                for sc in range(numScenes):
                    scTitle = self.tr("Scene {0}").format(f"{sc+1:d}")
                    sHandle = self.newFile(scTitle, nwItemClass.NOVEL, nHandle)

                    aDoc.openDocument(sHandle, showStatus=False)
                    aDoc.saveDocument("### %s\n\n" % scTitle)
                    aDoc.clearDocument()

        # Finalise
        if popCustom or popMinimal:
            self.projOpened = time()
            self.setProjectChanged(True)
            self.saveProject(autoSave=True)

        return True

    def openProject(self, fileName, overrideLock=False):
        """Open the project file provided, or if doesn't exist, assume
        it is a folder, and look for the file within it. If successful,
        parse the XML of the file and populate the project variables and
        build the tree of project items.
        """
        if not os.path.isfile(fileName):
            fileName = os.path.join(fileName, nwFiles.PROJ_FILE)
            if not os.path.isfile(fileName):
                self.makeAlert(self.tr("File not found: {0}").format(fileName), nwAlert.ERROR)
                return False

        self.clearProject()
        self.projPath = os.path.abspath(os.path.dirname(fileName))
        logger.debug("Opening project: %s" % self.projPath)

        # Standard Folders and Files
        # ==========================

        if not self.ensureFolderStructure():
            self.clearProject()
            return False

        self.projDict = os.path.join(self.projMeta, nwFiles.PROJ_DICT)

        # Check for Old Legacy Data
        # =========================

        legacyList = [] # Cleanup is done later
        for projItem in os.listdir(self.projPath):
            logger.verbose("Project contains: %s" % projItem)
            if projItem.startswith("data_"):
                legacyList.append(projItem)

        # Project Lock
        # ============

        if overrideLock:
            self._clearLockFile()

        lockStatus = self._readLockFile()
        if len(lockStatus) > 0:
            if lockStatus[0] == "ERROR":
                logger.warning("Failed to check lock file")
            else:
                logger.error("Project is locked, so not opening")
                self.lockedBy = lockStatus
                self.clearProject()
                return False
        else:
            logger.verbose("Project is not locked")

        # Open The Project XML File
        # =========================

        try:
            nwXML = etree.parse(fileName)
        except Exception as e:
            self.makeAlert([self.tr("Failed to parse project xml."), str(e)], nwAlert.ERROR)

            # Trying to open backup file instead
            backFile = fileName[:-3]+"bak"
            if os.path.isfile(backFile):
                self.makeAlert(
                    self.tr("Attempting to open backup project file instead."), nwAlert.INFO
                )
                try:
                    nwXML = etree.parse(backFile)
                except Exception as e:
                    self.makeAlert(
                        [self.tr("Failed to parse project xml."), str(e)], nwAlert.ERROR
                    )
                    self.clearProject()
                    return False
            else:
                self.clearProject()
                return False

        xRoot = nwXML.getroot()
        nwxRoot = xRoot.tag

        appVersion  = xRoot.attrib.get("appVersion",  self.tr("Unknown"))
        hexVersion  = xRoot.attrib.get("hexVersion",  "0x0")
        fileVersion = xRoot.attrib.get("fileVersion", self.tr("Unknown"))

        # The following are deprecated and will be removed
        # The settings have been moved to the <project> tag
        self.saveCount = checkInt(xRoot.attrib.get("saveCount", 0), 0, False)
        self.autoCount = checkInt(xRoot.attrib.get("autoCount", 0), 0, False)
        self.editTime  = checkInt(xRoot.attrib.get("editTime",  0), 0, False)

        logger.verbose("XML root is %s" % nwxRoot)
        logger.verbose("File version is %s" % fileVersion)

        # Check File Type
        # ===============

        if not nwxRoot == "novelWriterXML":
            self.makeAlert(
                self.tr("Project file does not appear to be a novelWriterXML file."),
                nwAlert.ERROR
            )
            self.clearProject()
            return False

        # Check Project Storage Version
        # =============================

        # Changes:
        # 1.0 : Original file format.
        # 1.1 : Changes the way documents are structured in the project
        #       folder from data_X, where X is the first hex value of
        #       the handle, to a single content folder.
        # 1.2 : Changes the way autoReplace entries are stored. The 1.1
        #       parser will lose the autoReplace settings if allowed to
        #       read the file. Introduced in version 0.10.

        if fileVersion == "1.0":
            msgYes = self.theParent.askQuestion(
                self.tr("Old Project Version"),
                "%s<br><br>%s" % (
                    self.tr(
                        "The project file and data is created by a novelWriter version "
                        "lower than 0.7. Do you want to upgrade the project to the "
                        "most recent format?"
                    ),
                    self.tr(
                        "Note that after the upgrade, you cannot open the project with "
                        "an older version of novelWriter any more, so make sure you "
                        "have a recent backup."
                    )
                )
            )
            if not msgYes:
                self.clearProject()
                return False

        elif fileVersion != "1.1" and fileVersion != "1.2":
            self.makeAlert((
                self.tr(
                    "Unknown or unsupported novelWriter project file format. "
                    "The project cannot be opened by this version of novelWriter. "
                    "The file was saved with novelWriter version {0}."
                ).format(appVersion)
            ), nwAlert.ERROR)
            self.clearProject()
            return False

        # Check novelWriter Version
        # =========================

        if hexToInt(hexVersion) > hexToInt(nw.__hexversion__):
            msgYes = self.theParent.askQuestion(
                self.tr("Version Conflict"),
                self.tr(
                    "This project was saved by a newer version of novelWriter, version "
                    "{0}. This is version {1}. If you continue to open the  project, "
                    "some attributes and settings may not be preserved, but the "
                    "overall project should be fine. Continue opening the project?"
                ).format(appVersion, nw.__version__)
            )
            if not msgYes:
                self.clearProject()
                return False

        # Start Parsing the XML
        # =====================

        for xChild in xRoot:
            if xChild.tag == "project":
                logger.debug("Found project meta")
                for xItem in xChild:
                    if xItem.text is None:
                        continue
                    if xItem.tag == "name":
                        logger.verbose("Working Title: '%s'" % xItem.text)
                        self.projName = xItem.text
                    elif xItem.tag == "title":
                        logger.verbose("Title is '%s'" % xItem.text)
                        self.bookTitle = xItem.text
                    elif xItem.tag == "author":
                        logger.verbose("Author: '%s'" % xItem.text)
                        self.bookAuthors.append(xItem.text)
                    elif xItem.tag == "saveCount":
                        self.saveCount = checkInt(xItem.text, 0)
                    elif xItem.tag == "autoCount":
                        self.autoCount = checkInt(xItem.text, 0)
                    elif xItem.tag == "editTime":
                        self.editTime = checkInt(xItem.text, 0)

                    # The following is deprecated, and will be removed
                    elif xItem.tag == "backup":
                        self.doBackup = checkBool(xItem.text, False)

            elif xChild.tag == "settings":
                logger.debug("Found project settings")
                for xItem in xChild:
                    if xItem.text is None:
                        continue
                    if xItem.tag == "doBackup":
                        self.doBackup = checkBool(xItem.text, False)
                    elif xItem.tag == "spellCheck":
                        self.spellCheck = checkBool(xItem.text, False)
                    elif xItem.tag == "spellLang":
                        self.projLang = checkString(xItem.text, None, True)
                    elif xItem.tag == "autoOutline":
                        self.autoOutline = checkBool(xItem.text, True)
                    elif xItem.tag == "lastEdited":
                        self.lastEdited = checkString(xItem.text, None, True)
                    elif xItem.tag == "lastViewed":
                        self.lastViewed = checkString(xItem.text, None, True)
                    elif xItem.tag == "lastWordCount":
                        self.lastWCount = checkInt(xItem.text, 0, False)
                    elif xItem.tag == "novelWordCount":
                        self.novelWCount = checkInt(xItem.text, 0, False)
                    elif xItem.tag == "notesWordCount":
                        self.notesWCount = checkInt(xItem.text, 0, False)
                    elif xItem.tag == "status":
                        self.statusItems.unpackXML(xItem)
                    elif xItem.tag == "importance":
                        self.importItems.unpackXML(xItem)
                    elif xItem.tag == "autoReplace":
                        for xEntry in xItem:
                            if xEntry.tag == "entry":
                                if "key" in xEntry.attrib:
                                    self.autoReplace[xEntry.attrib["key"]] = checkString(
                                        xEntry.text, None, False
                                    )
                            else: # Old format
                                self.autoReplace[xEntry.tag] = checkString(
                                    xEntry.text, None, False
                                )
                    elif xItem.tag == "titleFormat":
                        titleFormat = self.titleFormat.copy()
                        for xEntry in xItem:
                            titleFormat[xEntry.tag] = checkString(xEntry.text, "", False)
                        self.setTitleFormat(titleFormat)

            elif xChild.tag == "content":
                logger.debug("Found project content")
                self.projTree.unpackXML(xChild)

        self.optState.loadSettings()

        # Sort out old file locations
        if legacyList:
            errList = []
            for projItem in legacyList:
                errList = self._legacyDataFolder(projItem, errList)
            if errList:
                self.makeAlert(errList, nwAlert.ERROR)

        # Clean up old files
        self._deprecatedFiles()

        # Update recent projects
        self.mainConf.updateRecentCache(self.projPath, self.projName, self.lastWCount, time())
        self.mainConf.saveRecentCache()

        self.theParent.setStatus(self.tr("Opened Project: {0}").format(self.projName))

        self._scanProjectFolder()
        self.loadProjectLocalisation(self.projLang)

        self.currWCount = self.lastWCount
        self.projOpened = time()
        self.projAltered = False

        self._writeLockFile()
        self.setProjectChanged(False)

        return True

    def saveProject(self, autoSave=False):
        """Save the project main XML file. The saving command itself
        uses a temporary filename, and the file is renamed afterwards to
        make sure if the save fails, we're not left with a truncated
        file.
        """
        if self.projPath is None:
            self.makeAlert(
                self.tr("Project path not set, cannot save project."), nwAlert.ERROR
            )
            return False

        saveTime = time()
        if not self.ensureFolderStructure():
            return False

        logger.debug("Saving project: %s" % self.projPath)

        if autoSave:
            self.autoCount += 1
        else:
            self.saveCount += 1

        # Root element and project details
        logger.debug("Writing project meta")
        nwXML = etree.Element("novelWriterXML", attrib={
            "appVersion"  : str(nw.__version__),
            "hexVersion"  : str(nw.__hexversion__),
            "fileVersion" : "1.2",
            "timeStamp"   : formatTimeStamp(saveTime),
        })

        editTime = int(self.editTime + saveTime - self.projOpened)
        wcNovel, wcNotes = self.projTree.sumWords()
        self.novelWCount = wcNovel
        self.notesWCount = wcNotes
        self.setProjectWordCount(wcNovel + wcNotes)

        # Save Project Meta
        xProject = etree.SubElement(nwXML, "project")
        self._packProjectValue(xProject, "name", self.projName)
        self._packProjectValue(xProject, "title", self.bookTitle)
        self._packProjectValue(xProject, "author", self.bookAuthors)
        self._packProjectValue(xProject, "saveCount", str(self.saveCount))
        self._packProjectValue(xProject, "autoCount", str(self.autoCount))
        self._packProjectValue(xProject, "editTime", str(editTime))

        # Save Project Settings
        xSettings = etree.SubElement(nwXML, "settings")
        self._packProjectValue(xSettings, "doBackup", self.doBackup)
        self._packProjectValue(xSettings, "spellCheck", self.spellCheck)
        self._packProjectValue(xSettings, "spellLang", self.projLang)
        self._packProjectValue(xSettings, "autoOutline", self.autoOutline)
        self._packProjectValue(xSettings, "lastEdited", self.lastEdited)
        self._packProjectValue(xSettings, "lastViewed", self.lastViewed)
        self._packProjectValue(xSettings, "lastWordCount", self.currWCount)
        self._packProjectValue(xSettings, "novelWordCount", wcNovel)
        self._packProjectValue(xSettings, "notesWordCount", wcNotes)
        self._packProjectKeyValue(xSettings, "autoReplace", self.autoReplace)

        xTitleFmt = etree.SubElement(xSettings, "titleFormat")
        for aKey, aValue in self.titleFormat.items():
            if len(aKey) > 0:
                self._packProjectValue(xTitleFmt, aKey, aValue)

        xStatus = etree.SubElement(xSettings, "status")
        self.statusItems.packXML(xStatus)
        xStatus = etree.SubElement(xSettings, "importance")
        self.importItems.packXML(xStatus)

        # Save Tree Content
        logger.debug("Writing project content")
        self.projTree.packXML(nwXML)

        # Write the xml tree to file
        tempFile = os.path.join(self.projPath, self.projFile+"~")
        saveFile = os.path.join(self.projPath, self.projFile)
        backFile = os.path.join(self.projPath, self.projFile[:-3]+"bak")
        try:
            with open(tempFile, mode="wb") as outFile:
                outFile.write(etree.tostring(
                    nwXML,
                    pretty_print = True,
                    encoding = "utf-8",
                    xml_declaration = True
                ))
        except Exception as e:
            self.makeAlert([self.tr("Failed to save project."), str(e)], nwAlert.ERROR)
            return False

        # If we're here, the file was successfully saved,
        # so let's sort out the temps and backups
        if os.path.isfile(backFile):
            os.unlink(backFile)
        if os.path.isfile(saveFile):
            os.rename(saveFile, backFile)
        os.rename(tempFile, saveFile)

        # Save project GUI options
        self.optState.saveSettings()

        # Update recent projects
        self.mainConf.updateRecentCache(self.projPath, self.projName, self.currWCount, saveTime)
        self.mainConf.saveRecentCache()

        self._writeLockFile()
        self.theParent.setStatus(self.tr("Saved Project: {0}").format(self.projName))
        self.setProjectChanged(False)

        return True

    def closeProject(self, idleTime=0):
        """Close the current project and clear all meta data.
        """
        self.optState.saveSettings()
        self.projTree.writeToCFile()
        self._appendSessionStats(idleTime)
        self._clearLockFile()
        self.clearProject()
        self.lockedBy = None
        return True

    def ensureFolderStructure(self):
        """Ensure that all necessary folders exist in the project
        folder.
        """
        if self.projPath is None or self.projPath == "":
            return False

        if self.projPath == os.path.expanduser("~"):
            # Don't make a mess in the user's home folder
            return False

        self.projMeta    = os.path.join(self.projPath, "meta")
        self.projCache   = os.path.join(self.projPath, "cache")
        self.projContent = os.path.join(self.projPath, "content")

        if not self._checkFolder(self.projMeta):
            return False
        if not self._checkFolder(self.projCache):
            return False
        if not self._checkFolder(self.projContent):
            return False

        return True

    ##
    #  Zip/Unzip Project
    ##

    def zipIt(self, doNotify):
        """Create a zip file of the entire project.
        """
        if not self.theParent.hasProject:
            logger.error("No project open")
            return False

        logger.info("Backing up project")
        self.theParent.setStatus(self.tr("Backing up project ..."))

        if self.mainConf.backupPath is None or self.mainConf.backupPath == "":
            self.theParent.makeAlert(
                self.tr(
                    "Cannot backup project because no backup path is set. "
                    "Please set a valid backup location in Tools > Preferences."
                ), nwAlert.ERROR
            )
            return False

        if self.projName is None or self.projName == "":
            self.theParent.makeAlert(
                self.tr(
                    "Cannot backup project because no project name is set. "
                    "Please set a Working Title in Project > Project Settings."
                ), nwAlert.ERROR
            )
            return False

        if not os.path.isdir(self.mainConf.backupPath):
            self.theParent.makeAlert(
                self.tr(
                    "Cannot backup project because the backup path does not exist. "
                    "Please set a valid backup location in Tools > Preferences."
                ), nwAlert.ERROR
            )
            return False

        cleanName = makeFileNameSafe(self.projName)
        baseDir = os.path.abspath(os.path.join(self.mainConf.backupPath, cleanName))
        if not os.path.isdir(baseDir):
            try:
                os.mkdir(baseDir)
                logger.debug("Created folder %s" % baseDir)
            except Exception as e:
                self.theParent.makeAlert(
                    [self.tr("Could not create backup folder."), str(e)],
                    nwAlert.ERROR
                )
                return False

        if os.path.commonpath([self.projPath, baseDir]) == self.projPath:
            self.theParent.makeAlert(
                self.tr(
                    "Cannot backup project because the backup path is within the "
                    "project folder to be backed up. Please choose a different "
                    "backup path in Tools > Preferences."
                ), nwAlert.ERROR
            )
            return False

        archName = self.tr("Backup from {0}").format(formatTimeStamp(time(), fileSafe=True))
        baseName = os.path.join(baseDir, archName)

        try:
            self._clearLockFile()
            shutil.make_archive(baseName, "zip", self.projPath, ".")
            self._writeLockFile()
            logger.info("Backup written to: %s" % archName)
            if doNotify:
                self.theParent.makeAlert(
                    self.tr(
                        "Backup archive file written to: {0}"
                    ).format(
                        f"{os.path.join(cleanName, archName)}.zip"
                    ), nwAlert.INFO
                )

        except Exception as e:
            self.theParent.makeAlert(
                [self.tr("Could not write backup archive."), str(e)],
                nwAlert.ERROR
            )
            return False

        self.theParent.setStatus(self.tr("Project backed up to '{0}'").format(f"{baseName}.zip"))

        return True

    def extractSampleProject(self, projData):
        """Make a copy of the sample project.
        First, try to copy the content of the sample folder to the new
        project path, or if the folder doesn't exist, look for the zip
        file in the assets folder.
        """
        projPath = projData.get("projPath", None)
        if projPath is None:
            logger.error("No project path set for the example project")
            return False

        srcSample = os.path.abspath(os.path.join(self.mainConf.appRoot, "sample"))
        pkgSample = os.path.join(self.mainConf.assetPath, "sample.zip")

        isSuccess = False
        if os.path.isfile(pkgSample):

            self.setProjectPath(projPath, newProject=True)
            try:
                shutil.unpack_archive(pkgSample, projPath)
                isSuccess = True
            except Exception as e:
                self.makeAlert(
                    [self.tr("Failed to create a new example project."), str(e)], nwAlert.ERROR
                )

        elif os.path.isdir(srcSample):

            self.setProjectPath(projPath, newProject=True)
            try:
                srcProj = os.path.join(srcSample, nwFiles.PROJ_FILE)
                dstProj = os.path.join(projPath, nwFiles.PROJ_FILE)
                shutil.copyfile(srcProj, dstProj)

                srcContent = os.path.join(srcSample, "content")
                dstContent = os.path.join(projPath, "content")
                for srcFile in os.listdir(srcContent):
                    srcDoc = os.path.join(srcContent, srcFile)
                    dstDoc = os.path.join(dstContent, srcFile)
                    shutil.copyfile(srcDoc, dstDoc)

                isSuccess = True

            except Exception as e:
                self.makeAlert(
                    [self.tr("Failed to create a new example project."), str(e)], nwAlert.ERROR
                )

        else:
            self.makeAlert(
                self.tr(
                    "Failed to create a new example project. Could not find the "
                    "necessary files. They seem to be missing from this installation."
                ), nwAlert.ERROR
            )

        if isSuccess:
            self.clearProject()
            self.theParent.openProject(projPath)
            self.theParent.rebuildIndex()

        return isSuccess

    ##
    #  Setters
    ##

    def setProjectPath(self, projPath, newProject=False):
        """Set the project storage path, and also expand ~ to the user
        directory using the path library.
        """
        if projPath is None or projPath == "":
            self.projPath = None
        else:
            if projPath.startswith("~"):
                projPath = os.path.expanduser(projPath)
            self.projPath = os.path.abspath(projPath)

        if newProject:
            if not os.path.isdir(projPath):
                try:
                    os.mkdir(projPath)
                    logger.debug("Created folder %s" % projPath)
                except Exception as e:
                    self.theParent.makeAlert((
                        [self.tr("Could not create new project folder."), str(e)]
                    ), nwAlert.ERROR)
                    return False

            if os.path.isdir(projPath):
                if os.listdir(self.projPath):
                    self.theParent.makeAlert(
                        self.tr(
                            "New project folder is not empty. "
                            "Each project requires a dedicated project folder."
                        ), nwAlert.ERROR
                    )
                    return False

        self.ensureFolderStructure()
        self.setProjectChanged(True)

        return True

    def setProjectName(self, projName):
        """Set the project name (working title), This is the the title
        used for backup files etc.
        """
        self.projName = projName.strip()
        self.setProjectChanged(True)
        return True

    def setBookTitle(self, bookTitle):
        """Set the boom title, that is, the title to include in exports.
        """
        self.bookTitle = bookTitle.strip()
        self.setProjectChanged(True)
        return True

    def setBookAuthors(self, bookAuthors):
        """A line separated list of book authors, parsed into an array.
        """
        if not isinstance(bookAuthors, str):
            return False

        self.bookAuthors = []
        for bookAuthor in bookAuthors.split("\n"):
            bookAuthor = bookAuthor.strip()
            if bookAuthor == "":
                continue
            self.bookAuthors.append(bookAuthor)

        self.setProjectChanged(True)

        return True

    def setProjBackup(self, doBackup):
        """Set whether projects should be backed up or not. The user
        will be notified in case required settings are missing.
        """
        self.doBackup = doBackup
        if doBackup:
            if not os.path.isdir(self.mainConf.backupPath):
                self.theParent.makeAlert(
                    self.tr(
                        "You must set a valid backup path in preferences to use "
                        "the automatic project backup feature."
                    ), nwAlert.WARN
                )
                return False

            if self.projName == "":
                self.theParent.makeAlert(
                    self.tr(
                        "You must set a valid project name in project settings to "
                        "use the automatic project backup feature."
                    ), nwAlert.WARN
                )
                return False

        return True

    def setSpellCheck(self, theMode):
        """Enable/disable spell checking.
        """
        if self.spellCheck != theMode:
            self.spellCheck = theMode
            self.setProjectChanged(True)
        return self.spellCheck

    def setSpellLang(self, theLang):
        """Set the project-specific spell check language.
        """
        theLang = checkString(theLang, None, True)
        if self.projLang != theLang:
            self.projLang = theLang
            self.loadProjectLocalisation(theLang)
            self.setProjectChanged(True)
        return True

    def setAutoOutline(self, theMode):
        """Enable/disable automatic update of project outline.
        """
        if self.autoOutline != theMode:
            self.autoOutline = theMode
            self.setProjectChanged(True)
        return self.autoOutline

    def setTreeOrder(self, newOrder):
        """A list representing the linear/flattened order of project
        items in the GUI project tree. The user can rearrange the order
        by drag-and-drop. Forwarded to the NWTree class.
        """
        if len(self.projTree) != len(newOrder):
            logger.warning("Sizes of new and old tree order do not match")
        self.projTree.setOrder(newOrder)
        self.setProjectChanged(True)
        return True

    def setLastEdited(self, tHandle):
        """Set last edited project item.
        """
        if self.lastEdited != tHandle:
            self.lastEdited = tHandle
            self.setProjectChanged(True)
        return True

    def setLastViewed(self, tHandle):
        """Set last viewed project item.
        """
        if self.lastViewed != tHandle:
            self.lastViewed = tHandle
            self.setProjectChanged(True)
        return True

    def setProjectWordCount(self, theCount):
        """Set the current project word count.
        """
        if self.currWCount != theCount:
            self.currWCount = theCount
            self.setProjectChanged(True)
        return True

    def setStatusColours(self, newCols):
        """Update the list of novel file status flags. Also iterate
        through the project and replace keys that have been renamed.
        """
        replaceMap = self.statusItems.setNewEntries(newCols)
        for nwItem in self.projTree:
            if nwItem.itemClass == nwItemClass.NOVEL:
                if nwItem.itemStatus in replaceMap.keys():
                    nwItem.setStatus(replaceMap[nwItem.itemStatus])
        self.setProjectChanged(True)
        return True

    def setImportColours(self, newCols):
        """Update the list of note file importance flags. Also iterate
        through the project and replace keys that have been renamed.
        """
        replaceMap = self.importItems.setNewEntries(newCols)
        for nwItem in self.projTree:
            if nwItem.itemClass != nwItemClass.NOVEL:
                if nwItem.itemStatus in replaceMap.keys():
                    nwItem.setStatus(replaceMap[nwItem.itemStatus])
        self.setProjectChanged(True)
        return True

    def setAutoReplace(self, autoReplace):
        """Update the auto-replace dictionary. This replaces the entire
        dictionary, so alterations have to be made in a copy.
        """
        self.autoReplace = autoReplace
        self.setProjectChanged(True)
        return True

    def setTitleFormat(self, titleFormat):
        """Set the formatting of titles in the project.
        """
        for valKey, valEntry in titleFormat.items():
            if valKey in self.titleFormat:
                self.titleFormat[valKey] = checkString(valEntry, self.titleFormat[valKey], False)
        return True

    def setProjectChanged(self, bValue):
        """Toggle the project changed flag, and propagate the
        information to the GUI statusbar.
        """
        self.projChanged = bValue
        self.theParent.setProjectStatus(self.projChanged)
        if bValue:
            # If we've changed the project at all, this should be True
            self.projAltered = True
        return self.projChanged

    ##
    #  Getters
    ##

    def getAuthors(self):
        """Returns a formatted string of authors.
        """
        nAuth = len(self.bookAuthors)
        authString = ""

        if nAuth == 1:
            authString = self.bookAuthors[0]
        elif nAuth > 1:
            authString = "%s %s %s" % (
                ", ".join(self.bookAuthors[0:-1]), self.tr("and"), self.bookAuthors[-1]
            )

        return authString

    def getSessionWordCount(self):
        """Returns the number of words added or removed this session.
        """
        return self.currWCount - self.lastWCount

    def getCurrentEditTime(self):
        """Get the total project edit time, including the time spent in
        the current session.
        """
        return round(self.editTime + time() - self.projOpened)

    def getProjectItems(self):
        """This function ensures that the item tree loaded is sent to
        the GUI tree view in such a way that the tree can be built. That
        is, the parent item must be sent before its child. In principle,
        a proper XML file will already ensure that, but in the event the
        order has been altered, or a file is orphaned, this function is
        capable of handling it.
        """
        sentItems = []
        iterItems = self.projTree.handles()
        n = 0
        nMax = min(len(iterItems), 10000)
        while n < nMax:
            tHandle = iterItems[n]
            tItem   = self.projTree[tHandle]
            n += 1
            if tItem is None:
                # Technically a bug since treeOrder is built from the
                # same data as projTree
                continue
            elif tItem.itemParent is None:
                # Item is a root, or already been identified as an
                # orphaned item
                sentItems.append(tHandle)
                yield tItem
            elif tItem.itemParent in sentItems:
                # Item's parent has been sent, so all is fine
                sentItems.append(tHandle)
                yield tItem
            elif tItem.itemParent in iterItems:
                # Item's parent exists, but hasn't been sent yet, so add
                # it again to the end, but make sure this doesn't get
                # out hand, so we cap at 10000 items
                logger.warning("Item %s found before its parent" % tHandle)
                iterItems.append(tHandle)
                nMax = min(len(iterItems), 10000)
            else:
                # Item is orphaned
                logger.error("Item %s has no parent in current tree" % tHandle)
                tItem.setParent(None)
                yield tItem

    ##
    #  Class Methods
    ##

    def countStatus(self):
        """Count how many times the various status flags are used in the
        project tree. The counts themselves are kept in the NWStatus
        objects. This is essentially a refresh.
        """
        self.statusItems.resetCounts()
        self.importItems.resetCounts()
        for nwItem in self.projTree:
            if nwItem.itemClass == nwItemClass.NOVEL:
                self.statusItems.countEntry(nwItem.itemStatus)
            else:
                self.importItems.countEntry(nwItem.itemStatus)
        return

    def localLookup(self, theWord):
        """Look up a word in the translation map for the project and
        return it. The variable is cast to a string before lookup. If
        the word does not exist, it returns itself.
        """
        theValue = str(theWord)
        return self.langData.get(theValue, theValue)

    def loadProjectLocalisation(self, theLang):
        """Load the language data for the current project language.
        """
        if theLang is None:
            theLang = self.mainConf.spellLanguage
        if theLang is None:
            theLang = "en"

        lngShort = theLang.split("_")[0]
        loadFile = os.path.join(self.mainConf.langPath, "project_en.json")
        chkFile1 = os.path.join(self.mainConf.langPath, "project_%s.json" % theLang)
        chkFile2 = os.path.join(self.mainConf.langPath, "project_%s.json" % lngShort)

        if os.path.isfile(chkFile1):
            loadFile = chkFile1
        elif os.path.isfile(chkFile2):
            loadFile = chkFile2

        try:
            with open(loadFile, mode="r", encoding="utf8") as inFile:
                self.langData = json.load(inFile)
            logger.debug("Loaded project language file: %s" % os.path.basename(loadFile))

        except Exception:
            logger.error("Failed to load index file")
            nw.logException()
            return False

        return True

    ##
    #  Internal Functions
    ##

    def _readLockFile(self):
        """Reads the lock file in the project folder.
        """
        if self.projPath is None:
            return ["ERROR"]

        lockFile = os.path.join(self.projPath, nwFiles.PROJ_LOCK)
        if not os.path.isfile(lockFile):
            return []

        theLines = []
        try:
            with open(lockFile, mode="r", encoding="utf8") as inFile:
                theData = inFile.read()
                theLines = theData.splitlines()
                if len(theLines) != 4:
                    return ["ERROR"]

        except Exception:
            logger.error("Failed to read project lockfile")
            nw.logException()
            return ["ERROR"]

        return theLines

    def _writeLockFile(self):
        """Writes a lock file to the project folder.
        """
        if self.projPath is None:
            return False

        lockFile = os.path.join(self.projPath, nwFiles.PROJ_LOCK)
        try:
            with open(lockFile, mode="w+", encoding="utf8") as outFile:
                outFile.write("%s\n" % self.mainConf.hostName)
                outFile.write("%s\n" % self.mainConf.osType)
                outFile.write("%s\n" % self.mainConf.kernelVer)
                outFile.write("%d\n" % time())

        except Exception:
            logger.error("Failed to write project lockfile")
            nw.logException()
            return False

        return True

    def _clearLockFile(self):
        """Remove the lock file, if it exists.
        """
        if self.projPath is None:
            return False

        lockFile = os.path.join(self.projPath, nwFiles.PROJ_LOCK)
        if os.path.isfile(lockFile):
            try:
                os.unlink(lockFile)
            except Exception:
                logger.error("Failed to remove project lockfile")
                nw.logException()
                return False

        return True

    def _checkFolder(self, thePath):
        """Check if a folder exists, and if it doesn't, create it.
        """
        if not os.path.isdir(thePath):
            try:
                os.mkdir(thePath)
                logger.debug("Created folder %s" % thePath)
            except Exception as e:
                self.makeAlert(["Could not create folder.", str(e)], nwAlert.ERROR)
                return False
        return True

    def _packProjectValue(self, xParent, theName, theValue, allowNone=True):
        """Pack a list of values into an xml element.
        """
        if not isinstance(theValue, list):
            theValue = [theValue]
        for aValue in theValue:
            if (aValue == "" or aValue is None) and not allowNone:
                continue
            xItem = etree.SubElement(xParent, theName)
            xItem.text = str(aValue)
        return

    def _packProjectKeyValue(self, xParent, theName, theDict):
        """Pack the entries in the auto-replace dictionary.
        """
        xAutoRep = etree.SubElement(xParent, theName)
        for aKey, aValue in theDict.items():
            if len(aKey) > 0:
                xEntry = etree.SubElement(xAutoRep, "entry", attrib={"key": aKey})
                xEntry.text = aValue
        return

    def _scanProjectFolder(self):
        """Scan the project folder and check that the files in it are
        also in the project XML file. If they aren't, import them as
        orphaned files so the user can either delete them, or put them
        back into the project tree.
        """
        if self.projPath is None:
            return False

        # Then check the files in the data folder
        logger.debug("Checking files in project content folder")
        orphanFiles = []
        for fileItem in os.listdir(self.projContent):
            if not fileItem.endswith(".nwd"):
                logger.warning("Skipping file %s" % fileItem)
                continue
            if len(fileItem) != 17:
                logger.warning("Skipping file %s" % fileItem)
                continue
            fHandle = fileItem[:13]
            if not isHandle(fHandle):
                logger.warning("Skipping file %s" % fileItem)
                continue
            if fHandle in self.projTree:
                logger.debug("Checking file %s, handle %s: OK" % (fileItem, fHandle))
            else:
                logger.warning("Checking file %s, handle %s: Orphaned" % (fileItem, fHandle))
                orphanFiles.append(fHandle)

        # Report status
        if len(orphanFiles) > 0:
            self.makeAlert(
                self.tr("Found {0} orphaned file(s) in project folder.").format(len(orphanFiles)),
                nwAlert.WARN
            )
        else:
            logger.debug("File check OK")
            return

        # Handle orphans
        aDoc = NWDoc(self, self.theParent)
        nOrph = 0
        noWhere = False
        oPrefix = self.tr("Recovered")
        for oHandle in orphanFiles:

            # Look for meta data
            oName = ""
            oParent = None
            oClass = None
            oLayout = None
            if aDoc.openDocument(oHandle, showStatus=False, isOrphan=True) is not None:
                oName, oParent, oClass, oLayout = aDoc.getMeta()

            if oName:
                oName = self.tr("[{0}] {1}").format(
                    oPrefix, oName.replace("[%s]" % oPrefix, "").strip()
                )
            else:
                nOrph += 1
                oName = self.tr("Recovered File {0}").format(nOrph)

            # Recover file meta data
            if oClass is None:
                oClass = nwItemClass.NOVEL

            if oLayout is None:
                oLayout = nwItemLayout.NOTE

            if oParent is None or oParent not in self.projTree:
                oParent = self.projTree.findRoot(oClass)
                if oParent is None:
                    oParent = self.projTree.findRoot(nwItemClass.NOVEL)

            # If the file still has no parent item, skip it
            if oParent is None:
                noWhere = True
                continue

            orphItem = NWItem(self)
            orphItem.setName(oName)
            orphItem.setType(nwItemType.FILE)
            orphItem.setClass(oClass)
            orphItem.setLayout(oLayout)
            self.projTree.append(oHandle, oParent, orphItem)

        if noWhere:
            self.makeAlert(
                self.tr(
                    "One or more orphaned files could not be added back into the "
                    "project. Make sure at least a Novel root folder exists."
                ), nwAlert.WARN
            )

        return True

    def _appendSessionStats(self, idleTime):
        """Append session statistics to the sessions log file.
        """
        if not self.ensureFolderStructure():
            return False

        sessionFile = os.path.join(self.projMeta, nwFiles.SESS_STATS)
        isFile = os.path.isfile(sessionFile)

        try:
            with open(sessionFile, mode="a+", encoding="utf8") as outFile:
                if not isFile:
                    # It's a new file, so add a header
                    if self.lastWCount > 0:
                        outFile.write("# Offset %d\n" % self.lastWCount)
                    outFile.write("# %-17s  %-19s  %8s  %8s  %8s\n" % (
                        "Start Time", "End Time", "Novel", "Notes", "Idle"
                    ))

                outFile.write("%-19s  %-19s  %8d  %8d  %8d\n" % (
                    formatTimeStamp(self.projOpened),
                    formatTimeStamp(time()),
                    self.novelWCount,
                    self.notesWCount,
                    int(idleTime),
                ))

        except Exception:
            logger.error("Failed to write session stats file")
            nw.logException()
            return False

        return True

    ##
    #  Legacy Data Structure Handlers
    ##

    def _legacyDataFolder(self, theFolder, errList):
        """Clean up legacy data folders.
        """
        theData = os.path.join(self.projPath, theFolder)
        if not os.path.isdir(theData):
            errList.append(self.tr("Not a folder: {0}").format(theData))
            return errList

        logger.info("Old data folder %s found" % theFolder)

        # Move Documents to Content
        # =========================
        for dataItem in os.listdir(theData):
            theFile = os.path.join(theData, dataItem)
            if not os.path.isfile(theFile):
                theErr = self._moveUnknownItem(theData, dataItem)
                if theErr:
                    errList.append(theErr)
                continue

            if len(dataItem) == 21 and dataItem.endswith("_main.nwd"):
                tHandle = theFolder[-1]+dataItem[:12]
                newPath = os.path.join(self.projContent, tHandle+".nwd")
                try:
                    os.rename(theFile, newPath)
                    logger.info("Moved file: %s" % theFile)
                    logger.info("New location: %s" % newPath)
                except Exception:
                    errList.append(self.tr("Could not move: {0}").format(theFile))
                    logger.error("Could not move: %s" % theFile)
                    nw.logException()

            elif len(dataItem) == 21 and dataItem.endswith("_main.bak"):
                try:
                    os.unlink(theFile)
                    logger.info("Deleted file: %s" % theFile)
                except Exception:
                    errList.append(self.tr("Could not delete: {0}").format(theFile))
                    logger.error("Could not delete: %s" % theFile)
                    nw.logException()

            else:
                theErr = self._moveUnknownItem(theData, dataItem)
                if theErr:
                    errList.append(theErr)

        # Remove Data Folder
        # ==================
        try:
            os.rmdir(theData)
            logger.info("Deleted folder: %s" % theFolder)
        except Exception:
            errList.append(self.tr("Could not delete: {0}").format(theFolder))
            logger.error("Could not delete: %s" % theFolder)
            nw.logException()

        return errList

    def _moveUnknownItem(self, theDir, theItem):
        """Move an item that doesn't belong in the project folder to
        a junk folder.
        """
        theJunk = os.path.join(self.projPath, "junk")
        if not self._checkFolder(theJunk):
            return self.tr("Could not make folder: {0}").format(theJunk)

        theSrc = os.path.join(theDir, theItem)
        theDst = os.path.join(theJunk, theItem)

        try:
            os.rename(theSrc, theDst)
            logger.info("Moved to junk: %s" % theSrc)
        except Exception:
            logger.error("Could not move item %s to junk." % theSrc)
            nw.logException()
            return self.tr("Could not move item {0} to {1}.").format(theSrc, theJunk)

        return ""

    def _deprecatedFiles(self):
        """Delete files that are no longer used by novelWriter.
        """
        rmList = [
            os.path.join(self.projCache, "nwProject.nwx.0"),
            os.path.join(self.projCache, "nwProject.nwx.1"),
            os.path.join(self.projCache, "nwProject.nwx.2"),
            os.path.join(self.projCache, "nwProject.nwx.3"),
            os.path.join(self.projCache, "nwProject.nwx.4"),
            os.path.join(self.projCache, "nwProject.nwx.5"),
            os.path.join(self.projCache, "nwProject.nwx.6"),
            os.path.join(self.projCache, "nwProject.nwx.7"),
            os.path.join(self.projCache, "nwProject.nwx.8"),
            os.path.join(self.projCache, "nwProject.nwx.9"),
            os.path.join(self.projMeta,  "mainOptions.json"),
            os.path.join(self.projMeta,  "exportOptions.json"),
            os.path.join(self.projMeta,  "outlineOptions.json"),
            os.path.join(self.projMeta,  "timelineOptions.json"),
            os.path.join(self.projMeta,  "docMergeOptions.json"),
            os.path.join(self.projMeta,  "sessionLogOptions.json"),
            os.path.join(self.projPath,  "ToC.json"),
        ]

        for rmFile in rmList:
            if os.path.isfile(rmFile):
                logger.info("Deleting: %s" % rmFile)
                try:
                    os.unlink(rmFile)
                except Exception:
                    logger.error("Could not delete: %s" % rmFile)
                    nw.logException()
                    return False

        return True

# END Class NWProject
