/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

/**
   Class for handling Berkeley Mailbox stores.
*/

#include "prlog.h"
#include "msgCore.h"
#include "nsMsgBrkMBoxStore.h"
#include "nsIMsgFolder.h"
#include "nsMsgFolderFlags.h"
#include "nsMsgMessageFlags.h"
#include "nsIMsgLocalMailFolder.h"
#include "nsIInputStream.h"
#include "nsCOMArray.h"
#include "nsIFile.h"
#include "nsIDirectoryEnumerator.h"
#include "nsIMsgHdr.h"
#include "nsNetUtil.h"
#include "nsIMsgDatabase.h"
#include "nsNativeCharsetUtils.h"
#include "nsMsgUtils.h"
#include "nsIDBFolderInfo.h"
#include "nsMsgLocalFolderHdrs.h"
#include "nsMailHeaders.h"
#include "nsParseMailbox.h"
#include "nsIMailboxService.h"
#include "nsIMsgFolderCompactor.h"
#include "nsIPrefService.h"
#include "nsIPrefBranch.h"
#include "nsPrintfCString.h"
#include "nsQuarantinedOutputStream.h"
#include "mozilla/Preferences.h"
#include "mozilla/SlicedInputStream.h"
#include "prprf.h"
#include <cstdlib>  // for std::abs(int/long)
#include <cmath>    // for std::abs(float/double)

nsMsgBrkMBoxStore::nsMsgBrkMBoxStore() {}

nsMsgBrkMBoxStore::~nsMsgBrkMBoxStore() {}

NS_IMPL_ISUPPORTS(nsMsgBrkMBoxStore, nsIMsgPluggableStore)

NS_IMETHODIMP nsMsgBrkMBoxStore::DiscoverSubFolders(nsIMsgFolder* aParentFolder,
                                                    bool aDeep) {
  NS_ENSURE_ARG_POINTER(aParentFolder);

  nsCOMPtr<nsIFile> path;
  nsresult rv = aParentFolder->GetFilePath(getter_AddRefs(path));
  if (NS_FAILED(rv)) return rv;

  bool exists;
  path->Exists(&exists);
  if (!exists) {
    rv = path->Create(nsIFile::DIRECTORY_TYPE, 0755);
    NS_ENSURE_SUCCESS(rv, rv);
  }

  return AddSubFolders(aParentFolder, path, aDeep);
}

NS_IMETHODIMP nsMsgBrkMBoxStore::CreateFolder(nsIMsgFolder* aParent,
                                              const nsAString& aFolderName,
                                              nsIMsgFolder** aResult) {
  NS_ENSURE_ARG_POINTER(aParent);
  NS_ENSURE_ARG_POINTER(aResult);
  if (aFolderName.IsEmpty()) return NS_MSG_ERROR_INVALID_FOLDER_NAME;

  nsCOMPtr<nsIFile> path;
  nsCOMPtr<nsIMsgFolder> child;
  nsresult rv = aParent->GetFilePath(getter_AddRefs(path));
  if (NS_FAILED(rv)) return rv;
  // Get a directory based on our current path.
  rv = CreateDirectoryForFolder(path);
  if (NS_FAILED(rv)) return rv;

  // Now we have a valid directory or we have returned.
  // Make sure the new folder name is valid
  nsAutoString safeFolderName(aFolderName);
  NS_MsgHashIfNecessary(safeFolderName);

  path->Append(safeFolderName);
  bool exists;
  path->Exists(&exists);
  if (exists)  // check this because localized names are different from disk
               // names
    return NS_MSG_FOLDER_EXISTS;

  rv = path->Create(nsIFile::NORMAL_FILE_TYPE, 0600);
  NS_ENSURE_SUCCESS(rv, rv);

  // GetFlags and SetFlags in AddSubfolder will fail because we have no db at
  // this point but mFlags is set.
  rv = aParent->AddSubfolder(safeFolderName, getter_AddRefs(child));
  if (!child || NS_FAILED(rv)) {
    path->Remove(false);
    return rv;
  }
  // Create an empty database for this mail folder, set its name from the user
  nsCOMPtr<nsIMsgDBService> msgDBService =
      do_GetService("@mozilla.org/msgDatabase/msgDBService;1", &rv);
  if (msgDBService) {
    nsCOMPtr<nsIMsgDatabase> unusedDB;
    rv = msgDBService->OpenFolderDB(child, true, getter_AddRefs(unusedDB));
    if (rv == NS_MSG_ERROR_FOLDER_SUMMARY_MISSING)
      rv = msgDBService->CreateNewDB(child, getter_AddRefs(unusedDB));

    if ((NS_SUCCEEDED(rv) || rv == NS_MSG_ERROR_FOLDER_SUMMARY_OUT_OF_DATE) &&
        unusedDB) {
      // need to set the folder name
      nsCOMPtr<nsIDBFolderInfo> folderInfo;
      rv = unusedDB->GetDBFolderInfo(getter_AddRefs(folderInfo));
      if (NS_SUCCEEDED(rv)) folderInfo->SetMailboxName(safeFolderName);

      unusedDB->SetSummaryValid(true);
      unusedDB->Close(true);
      aParent->UpdateSummaryTotals(true);
    } else {
      path->Remove(false);
      rv = NS_MSG_CANT_CREATE_FOLDER;
    }
  }
  child.forget(aResult);
  return rv;
}

// Get the current attributes of the mbox file, corrected for caching
void nsMsgBrkMBoxStore::GetMailboxModProperties(nsIMsgFolder* aFolder,
                                                int64_t* aSize,
                                                uint32_t* aDate) {
  // We'll simply return 0 on errors.
  *aDate = 0;
  *aSize = 0;
  nsCOMPtr<nsIFile> pathFile;
  nsresult rv = aFolder->GetFilePath(getter_AddRefs(pathFile));
  NS_ENSURE_SUCCESS_VOID(rv);

  rv = pathFile->GetFileSize(aSize);
  if (NS_FAILED(rv)) return;  // expected result for virtual folders

  PRTime lastModTime;
  rv = pathFile->GetLastModifiedTime(&lastModTime);
  NS_ENSURE_SUCCESS_VOID(rv);

  *aDate = (uint32_t)(lastModTime / PR_MSEC_PER_SEC);
}

NS_IMETHODIMP nsMsgBrkMBoxStore::HasSpaceAvailable(nsIMsgFolder* aFolder,
                                                   int64_t aSpaceRequested,
                                                   bool* aResult) {
  NS_ENSURE_ARG_POINTER(aResult);
  NS_ENSURE_ARG_POINTER(aFolder);

  nsCOMPtr<nsIFile> pathFile;
  nsresult rv = aFolder->GetFilePath(getter_AddRefs(pathFile));
  NS_ENSURE_SUCCESS(rv, rv);

  bool allow4GBfolders =
      mozilla::Preferences::GetBool("mailnews.allowMboxOver4GB", true);

  if (!allow4GBfolders) {
    // Allow the mbox to only reach 0xFFC00000 = 4 GiB - 4 MiB.
    int64_t fileSize;
    rv = pathFile->GetFileSize(&fileSize);
    NS_ENSURE_SUCCESS(rv, rv);

    *aResult = ((fileSize + aSpaceRequested) < 0xFFC00000LL);
    if (!*aResult) return NS_ERROR_FILE_TOO_BIG;
  }

  *aResult = DiskSpaceAvailableInStore(pathFile, aSpaceRequested);
  if (!*aResult) return NS_ERROR_FILE_NO_DEVICE_SPACE;

  return NS_OK;
}

static bool gGotGlobalPrefs = false;
static int32_t gTimeStampLeeway = 60;

NS_IMETHODIMP nsMsgBrkMBoxStore::IsSummaryFileValid(nsIMsgFolder* aFolder,
                                                    nsIMsgDatabase* aDB,
                                                    bool* aResult) {
  NS_ENSURE_ARG_POINTER(aFolder);
  NS_ENSURE_ARG_POINTER(aDB);
  NS_ENSURE_ARG_POINTER(aResult);
  // We only check local folders for db validity.
  nsCOMPtr<nsIMsgLocalMailFolder> localFolder(do_QueryInterface(aFolder));
  if (!localFolder) {
    *aResult = true;
    return NS_OK;
  }

  nsCOMPtr<nsIFile> pathFile;
  nsresult rv = aFolder->GetFilePath(getter_AddRefs(pathFile));
  NS_ENSURE_SUCCESS(rv, rv);
  nsCOMPtr<nsIDBFolderInfo> folderInfo;
  rv = aDB->GetDBFolderInfo(getter_AddRefs(folderInfo));
  NS_ENSURE_SUCCESS(rv, rv);
  int64_t folderSize;
  uint32_t folderDate;
  int32_t numUnreadMessages;

  *aResult = false;

  folderInfo->GetNumUnreadMessages(&numUnreadMessages);
  folderInfo->GetFolderSize(&folderSize);
  folderInfo->GetFolderDate(&folderDate);

  int64_t fileSize = 0;
  uint32_t actualFolderTimeStamp = 0;
  GetMailboxModProperties(aFolder, &fileSize, &actualFolderTimeStamp);

  if (folderSize == fileSize && numUnreadMessages >= 0) {
    if (!folderSize) {
      *aResult = true;
      return NS_OK;
    }
    if (!gGotGlobalPrefs) {
      nsCOMPtr<nsIPrefBranch> pPrefBranch(
          do_GetService(NS_PREFSERVICE_CONTRACTID));
      if (pPrefBranch) {
        rv = pPrefBranch->GetIntPref("mail.db_timestamp_leeway",
                                     &gTimeStampLeeway);
        gGotGlobalPrefs = true;
      }
    }
    // if those values are ok, check time stamp
    if (gTimeStampLeeway == 0)
      *aResult = folderDate == actualFolderTimeStamp;
    else
      *aResult = std::abs((int32_t)(actualFolderTimeStamp - folderDate)) <=
                 gTimeStampLeeway;
  }
  return NS_OK;
}

NS_IMETHODIMP nsMsgBrkMBoxStore::SetSummaryFileValid(nsIMsgFolder* aFolder,
                                                     nsIMsgDatabase* aDB,
                                                     bool aValid) {
  NS_ENSURE_ARG_POINTER(aFolder);
  NS_ENSURE_ARG_POINTER(aDB);
  // We only need to do this for local folders.
  nsCOMPtr<nsIMsgLocalMailFolder> localFolder(do_QueryInterface(aFolder));
  if (!localFolder) return NS_OK;

  nsCOMPtr<nsIFile> pathFile;
  nsresult rv = aFolder->GetFilePath(getter_AddRefs(pathFile));
  NS_ENSURE_SUCCESS(rv, rv);
  nsCOMPtr<nsIDBFolderInfo> folderInfo;
  rv = aDB->GetDBFolderInfo(getter_AddRefs(folderInfo));
  NS_ENSURE_SUCCESS(rv, rv);
  bool exists;
  pathFile->Exists(&exists);
  if (!exists) return NS_MSG_ERROR_FOLDER_MISSING;

  if (aValid) {
    uint32_t actualFolderTimeStamp;
    int64_t fileSize;
    GetMailboxModProperties(aFolder, &fileSize, &actualFolderTimeStamp);
    folderInfo->SetFolderSize(fileSize);
    folderInfo->SetFolderDate(actualFolderTimeStamp);
  } else {
    folderInfo->SetVersion(0);  // that ought to do the trick.
  }
  aDB->Commit(nsMsgDBCommitType::kLargeCommit);
  return rv;
}

NS_IMETHODIMP nsMsgBrkMBoxStore::DeleteFolder(nsIMsgFolder* aFolder) {
  NS_ENSURE_ARG_POINTER(aFolder);
  bool exists;

  // Delete mbox file.
  nsCOMPtr<nsIFile> pathFile;
  nsresult rv = aFolder->GetFilePath(getter_AddRefs(pathFile));
  NS_ENSURE_SUCCESS(rv, rv);

  exists = false;
  pathFile->Exists(&exists);
  if (exists) {
    rv = pathFile->Remove(false);
    NS_ENSURE_SUCCESS(rv, rv);
  }

  // Delete any subfolders (.sbd-suffixed directories).
  AddDirectorySeparator(pathFile);
  exists = false;
  pathFile->Exists(&exists);
  if (exists) {
    rv = pathFile->Remove(true);
    NS_ENSURE_SUCCESS(rv, rv);
  }

  return NS_OK;
}

NS_IMETHODIMP nsMsgBrkMBoxStore::RenameFolder(nsIMsgFolder* aFolder,
                                              const nsAString& aNewName,
                                              nsIMsgFolder** aNewFolder) {
  NS_ENSURE_ARG_POINTER(aFolder);
  NS_ENSURE_ARG_POINTER(aNewFolder);

  uint32_t numChildren;
  aFolder->GetNumSubFolders(&numChildren);
  nsString existingName;
  aFolder->GetName(existingName);

  nsCOMPtr<nsIFile> oldPathFile;
  nsresult rv = aFolder->GetFilePath(getter_AddRefs(oldPathFile));
  if (NS_FAILED(rv)) return rv;

  nsCOMPtr<nsIMsgFolder> parentFolder;
  rv = aFolder->GetParent(getter_AddRefs(parentFolder));
  if (!parentFolder) return NS_ERROR_NULL_POINTER;

  nsCOMPtr<nsIFile> oldSummaryFile;
  rv = aFolder->GetSummaryFile(getter_AddRefs(oldSummaryFile));
  NS_ENSURE_SUCCESS(rv, rv);

  nsCOMPtr<nsIFile> dirFile;
  oldPathFile->Clone(getter_AddRefs(dirFile));

  if (numChildren > 0) {
    rv = CreateDirectoryForFolder(dirFile);
    NS_ENSURE_SUCCESS(rv, rv);
  }

  nsAutoString safeName(aNewName);
  NS_MsgHashIfNecessary(safeName);

  nsAutoCString oldLeafName;
  oldPathFile->GetNativeLeafName(oldLeafName);

  nsCOMPtr<nsIFile> parentPathFile;
  parentFolder->GetFilePath(getter_AddRefs(parentPathFile));
  NS_ENSURE_SUCCESS(rv, rv);

  bool isDirectory = false;
  parentPathFile->IsDirectory(&isDirectory);
  if (!isDirectory) {
    nsAutoString leafName;
    parentPathFile->GetLeafName(leafName);
    leafName.AppendLiteral(FOLDER_SUFFIX);
    rv = parentPathFile->SetLeafName(leafName);
    NS_ENSURE_SUCCESS(rv, rv);
  }

  aFolder->ForceDBClosed();
  // save off dir name before appending .msf
  rv = oldPathFile->MoveTo(nullptr, safeName);
  if (NS_FAILED(rv)) return rv;

  nsString dbName(safeName);
  dbName.AppendLiteral(SUMMARY_SUFFIX);
  oldSummaryFile->MoveTo(nullptr, dbName);

  if (numChildren > 0) {
    // rename "*.sbd" directory
    nsAutoString newNameDirStr(safeName);
    newNameDirStr.AppendLiteral(FOLDER_SUFFIX);
    dirFile->MoveTo(nullptr, newNameDirStr);
  }

  return parentFolder->AddSubfolder(safeName, aNewFolder);
}

NS_IMETHODIMP nsMsgBrkMBoxStore::CopyFolder(
    nsIMsgFolder* aSrcFolder, nsIMsgFolder* aDstFolder, bool aIsMoveFolder,
    nsIMsgWindow* aMsgWindow, nsIMsgCopyServiceListener* aListener,
    const nsAString& aNewName) {
  NS_ENSURE_ARG_POINTER(aSrcFolder);
  NS_ENSURE_ARG_POINTER(aDstFolder);

  nsAutoString folderName;
  if (aNewName.IsEmpty())
    aSrcFolder->GetName(folderName);
  else
    folderName.Assign(aNewName);

  nsAutoString safeFolderName(folderName);
  NS_MsgHashIfNecessary(safeFolderName);
  nsCOMPtr<nsIMsgLocalMailFolder> localSrcFolder(do_QueryInterface(aSrcFolder));
  nsCOMPtr<nsIMsgDatabase> srcDB;
  if (localSrcFolder)
    localSrcFolder->GetDatabaseWOReparse(getter_AddRefs(srcDB));
  bool summaryValid = !!srcDB;
  srcDB = nullptr;
  aSrcFolder->ForceDBClosed();

  nsCOMPtr<nsIFile> oldPath;
  nsresult rv = aSrcFolder->GetFilePath(getter_AddRefs(oldPath));
  NS_ENSURE_SUCCESS(rv, rv);

  nsCOMPtr<nsIFile> summaryFile;
  GetSummaryFileLocation(oldPath, getter_AddRefs(summaryFile));

  nsCOMPtr<nsIFile> newPath;
  rv = aDstFolder->GetFilePath(getter_AddRefs(newPath));
  NS_ENSURE_SUCCESS(rv, rv);

  bool newPathIsDirectory = false;
  newPath->IsDirectory(&newPathIsDirectory);
  if (!newPathIsDirectory) {
    AddDirectorySeparator(newPath);
    rv = newPath->Create(nsIFile::DIRECTORY_TYPE, 0700);
    if (rv == NS_ERROR_FILE_ALREADY_EXISTS) rv = NS_OK;
    NS_ENSURE_SUCCESS(rv, rv);
  }

  nsCOMPtr<nsIFile> origPath;
  oldPath->Clone(getter_AddRefs(origPath));

  // copying necessary for aborting.... if failure return
  rv = oldPath->CopyTo(newPath, safeFolderName);
  NS_ENSURE_SUCCESS(rv, rv);  // Will fail if a file by that name exists

  // Copy to dir can fail if filespec does not exist. If copy fails, we test
  // if the filespec exist or not, if it does not that's ok, we continue
  // without copying it. If it fails and filespec exist and is not zero sized
  // there is real problem
  // Copy the file to the new dir
  nsAutoString dbName(safeFolderName);
  dbName.AppendLiteral(SUMMARY_SUFFIX);
  rv = summaryFile->CopyTo(newPath, dbName);
  if (NS_FAILED(rv))  // Test if the copy is successful
  {
    // Test if the filespec has data
    bool exists;
    int64_t fileSize;
    summaryFile->Exists(&exists);
    summaryFile->GetFileSize(&fileSize);
    if (exists && fileSize > 0)
      NS_ENSURE_SUCCESS(rv, rv);  // Yes, it should have worked !
    // else case is filespec is zero sized, no need to copy it,
    // not an error
  }

  nsCOMPtr<nsIMsgFolder> newMsgFolder;
  rv = aDstFolder->AddSubfolder(safeFolderName, getter_AddRefs(newMsgFolder));
  NS_ENSURE_SUCCESS(rv, rv);

  // linux and mac are not good about maintaining the file stamp when copying
  // folders around. So if the source folder db is good, set the dest db as
  // good too.
  nsCOMPtr<nsIMsgDatabase> destDB;
  if (summaryValid) {
    nsAutoString folderLeafName;
    origPath->GetLeafName(folderLeafName);
    newPath->Append(folderLeafName);
    nsCOMPtr<nsIMsgDBService> msgDBService =
        do_GetService("@mozilla.org/msgDatabase/msgDBService;1", &rv);
    NS_ENSURE_SUCCESS(rv, rv);
    rv = msgDBService->OpenMailDBFromFile(newPath, newMsgFolder, false, true,
                                          getter_AddRefs(destDB));
    if (rv == NS_MSG_ERROR_FOLDER_SUMMARY_OUT_OF_DATE && destDB)
      destDB->SetSummaryValid(true);
  }
  newMsgFolder->SetPrettyName(folderName);
  uint32_t flags;
  aSrcFolder->GetFlags(&flags);
  newMsgFolder->SetFlags(flags);
  bool changed = false;
  rv = aSrcFolder->MatchOrChangeFilterDestination(newMsgFolder, true, &changed);
  if (changed) aSrcFolder->AlertFilterChanged(aMsgWindow);

  nsTArray<RefPtr<nsIMsgFolder>> subFolders;
  rv = aSrcFolder->GetSubFolders(subFolders);
  NS_ENSURE_SUCCESS(rv, rv);

  // Copy subfolders to the new location
  nsresult copyStatus = NS_OK;
  nsCOMPtr<nsIMsgLocalMailFolder> localNewFolder(
      do_QueryInterface(newMsgFolder, &rv));
  if (NS_SUCCEEDED(rv)) {
    for (nsIMsgFolder* folder : subFolders) {
      copyStatus =
          localNewFolder->CopyFolderLocal(folder, false, aMsgWindow, aListener);
      // Test if the call succeeded, if not we have to stop recursive call
      if (NS_FAILED(copyStatus)) {
        // Copy failed we have to notify caller to handle the error and stop
        // moving the folders. In case this happens to the topmost level of
        // recursive call, then we just need to break from the while loop and
        // go to error handling code.
        if (!aIsMoveFolder) return copyStatus;
        break;
      }
    }
  }

  if (aIsMoveFolder && NS_SUCCEEDED(copyStatus)) {
    if (localNewFolder) {
      nsCOMPtr<nsISupports> srcSupport(do_QueryInterface(aSrcFolder));
      localNewFolder->OnCopyCompleted(srcSupport, true);
    }

    // Notify the "folder" that was dragged and dropped has been created. No
    // need to do this for its subfolders. isMoveFolder will be true for folder.
    aDstFolder->NotifyFolderAdded(newMsgFolder);

    nsCOMPtr<nsIMsgFolder> msgParent;
    aSrcFolder->GetParent(getter_AddRefs(msgParent));
    aSrcFolder->SetParent(nullptr);
    if (msgParent) {
      // The files have already been moved, so delete storage false
      msgParent->PropagateDelete(aSrcFolder, false);
      oldPath->Remove(false);  // berkeley mailbox
      aSrcFolder->DeleteStorage();

      nsCOMPtr<nsIFile> parentPath;
      rv = msgParent->GetFilePath(getter_AddRefs(parentPath));
      NS_ENSURE_SUCCESS(rv, rv);

      AddDirectorySeparator(parentPath);
      nsCOMPtr<nsIDirectoryEnumerator> children;
      parentPath->GetDirectoryEntries(getter_AddRefs(children));
      bool more;
      // checks if the directory is empty or not
      if (children && NS_SUCCEEDED(children->HasMoreElements(&more)) && !more)
        parentPath->Remove(true);
    }
  } else {
    // This is the case where the copy of a subfolder failed.
    // We have to delete the newDirectory tree to make a "rollback".
    // Someone should add a popup to warn the user that the move was not
    // possible.
    if (aIsMoveFolder && NS_FAILED(copyStatus)) {
      nsCOMPtr<nsIMsgFolder> msgParent;
      newMsgFolder->ForceDBClosed();
      newMsgFolder->GetParent(getter_AddRefs(msgParent));
      newMsgFolder->SetParent(nullptr);
      if (msgParent) {
        msgParent->PropagateDelete(newMsgFolder, false);
        newMsgFolder->DeleteStorage();
        AddDirectorySeparator(newPath);
        newPath->Remove(true);  // berkeley mailbox
      }
      return NS_ERROR_FAILURE;
    }
  }
  return NS_OK;
}

NS_IMETHODIMP
nsMsgBrkMBoxStore::GetNewMsgOutputStream(nsIMsgFolder* aFolder,
                                         nsIMsgDBHdr** aNewMsgHdr,
                                         nsIOutputStream** aResult) {
  bool quarantining = false;
  nsCOMPtr<nsIPrefBranch> prefBranch(do_GetService(NS_PREFSERVICE_CONTRACTID));
  if (prefBranch) {
    prefBranch->GetBoolPref("mailnews.downloadToTempFile", &quarantining);
  }

  if (!quarantining) {
    // Caller will write directly to mbox.
    return InternalGetNewMsgOutputStream(aFolder, aNewMsgHdr, aResult);
  }

  // Quarantining is on, so we want to write the new message to a temp file
  // and let the virus checker have at it before we append it to the mbox.
  // We'll wrap the mboxStream with an nsQuarantinedOutputStream and return
  // that.
  nsCOMPtr<nsIOutputStream> mboxStream;
  nsresult rv = InternalGetNewMsgOutputStream(aFolder, aNewMsgHdr,
                                              getter_AddRefs(mboxStream));
  NS_ENSURE_SUCCESS(rv, rv);

  RefPtr<nsQuarantinedOutputStream> qStream =
      new nsQuarantinedOutputStream(mboxStream);
  qStream.forget(aResult);
  return NS_OK;
}

nsresult nsMsgBrkMBoxStore::InternalGetNewMsgOutputStream(
    nsIMsgFolder* aFolder, nsIMsgDBHdr** aNewMsgHdr,
    nsIOutputStream** aResult) {
  NS_ENSURE_ARG_POINTER(aFolder);
  NS_ENSURE_ARG_POINTER(aNewMsgHdr);
  NS_ENSURE_ARG_POINTER(aResult);

#ifdef _DEBUG
  NS_ASSERTION(m_streamOutstandingFolder != aFolder, "didn't finish prev msg");
  m_streamOutstandingFolder = aFolder;
#endif

  nsresult rv;
  nsCOMPtr<nsIFile> mboxFile;
  rv = aFolder->GetFilePath(getter_AddRefs(mboxFile));
  NS_ENSURE_SUCCESS(rv, rv);
  nsCOMPtr<nsIMsgDatabase> db;
  aFolder->GetMsgDatabase(getter_AddRefs(db));
  if (!db && !*aNewMsgHdr) NS_WARNING("no db, and no message header");
  bool exists = false;
  mboxFile->Exists(&exists);
  if (!exists) {
    rv = mboxFile->Create(nsIFile::NORMAL_FILE_TYPE, 0600);
    NS_ENSURE_SUCCESS(rv, rv);
  }

  nsCString URI;
  aFolder->GetURI(URI);
  nsCOMPtr<nsISeekableStream> seekable;
  if (m_outputStreams.Get(URI, aResult)) {
    seekable = do_QueryInterface(*aResult, &rv);
    NS_ENSURE_SUCCESS(rv, rv);
    rv = seekable->Seek(nsISeekableStream::NS_SEEK_END, 0);
    if (NS_FAILED(rv)) {
      m_outputStreams.Remove(URI);
      NS_RELEASE(*aResult);
    }
  }
  if (!*aResult) {
    rv = MsgGetFileStream(mboxFile, aResult);
    NS_ASSERTION(NS_SUCCEEDED(rv), "failed opening offline store for output");
    if (NS_FAILED(rv))
      printf("failed opening offline store for %s\n", URI.get());
    NS_ENSURE_SUCCESS(rv, rv);
    seekable = do_QueryInterface(*aResult, &rv);
    NS_ENSURE_SUCCESS(rv, rv);
    rv = seekable->Seek(nsISeekableStream::NS_SEEK_END, 0);
    NS_ENSURE_SUCCESS(rv, rv);
    m_outputStreams.InsertOrUpdate(URI, *aResult);
  }
  int64_t filePos;
  seekable->Tell(&filePos);

  if (db && !*aNewMsgHdr) {
    db->CreateNewHdr(nsMsgKey_None, aNewMsgHdr);
  }

  if (*aNewMsgHdr) {
    nsCString storeToken = nsPrintfCString("%" PRId64, filePos);
    (*aNewMsgHdr)->SetStringProperty("storeToken", storeToken);
    (*aNewMsgHdr)->SetMessageOffset(filePos);
  }
  return rv;
}

NS_IMETHODIMP
nsMsgBrkMBoxStore::DiscardNewMessage(nsIOutputStream* aOutputStream,
                                     nsIMsgDBHdr* aNewHdr) {
  NS_ENSURE_ARG_POINTER(aOutputStream);
  NS_ENSURE_ARG_POINTER(aNewHdr);
#ifdef _DEBUG
  m_streamOutstandingFolder = nullptr;
#endif
  nsCOMPtr<nsISafeOutputStream> safe = do_QueryInterface(aOutputStream);
  if (safe) {
    // nsISafeOutputStream only writes upon finish(), so no cleanup required.
    return aOutputStream->Close();
  }
  // Truncate the mbox back to where we started writing.
  uint64_t hdrOffset;
  aNewHdr->GetMessageOffset(&hdrOffset);
  aOutputStream->Close();
  nsCOMPtr<nsIFile> mboxFile;
  nsCOMPtr<nsIMsgFolder> folder;
  nsresult rv = aNewHdr->GetFolder(getter_AddRefs(folder));
  NS_ENSURE_SUCCESS(rv, rv);
  rv = folder->GetFilePath(getter_AddRefs(mboxFile));
  NS_ENSURE_SUCCESS(rv, rv);
  return mboxFile->SetFileSize(hdrOffset);
}

NS_IMETHODIMP
nsMsgBrkMBoxStore::FinishNewMessage(nsIOutputStream* aOutputStream,
                                    nsIMsgDBHdr* aNewHdr) {
  NS_ENSURE_ARG_POINTER(aOutputStream);
#ifdef _DEBUG
  m_streamOutstandingFolder = nullptr;
#endif
  // Quarantining is implemented using a nsISafeOutputStream.
  // It requires an explicit commit, or the data will be discarded.
  nsCOMPtr<nsISafeOutputStream> safe = do_QueryInterface(aOutputStream);
  if (safe) {
    return safe->Finish();
  }
  aOutputStream->Close();
  return NS_OK;
}

NS_IMETHODIMP
nsMsgBrkMBoxStore::MoveNewlyDownloadedMessage(nsIMsgDBHdr* aNewHdr,
                                              nsIMsgFolder* aDestFolder,
                                              bool* aResult) {
  NS_ENSURE_ARG_POINTER(aNewHdr);
  NS_ENSURE_ARG_POINTER(aDestFolder);
  NS_ENSURE_ARG_POINTER(aResult);
  *aResult = false;
  return NS_OK;
}

NS_IMETHODIMP
nsMsgBrkMBoxStore::GetMsgInputStream(nsIMsgFolder* aMsgFolder,
                                     const nsACString& aMsgToken,
                                     nsIInputStream** aResult) {
  MOZ_ASSERT(aMsgFolder);
  MOZ_ASSERT(aResult);
  MOZ_ASSERT(!aMsgToken.IsEmpty());

  uint64_t offset = ParseUint64Str(PromiseFlatCString(aMsgToken).get());
  nsCOMPtr<nsIFile> mboxFile;
  nsresult rv = aMsgFolder->GetFilePath(getter_AddRefs(mboxFile));
  NS_ENSURE_SUCCESS(rv, rv);
  nsCOMPtr<nsIInputStream> msgStream;
  rv = NS_NewLocalFileInputStream(getter_AddRefs(msgStream), mboxFile);
  NS_ENSURE_SUCCESS(rv, rv);
  nsCOMPtr<nsISeekableStream> seekable(do_QueryInterface(msgStream));
  rv = seekable->Seek(PR_SEEK_SET, offset);
  NS_ENSURE_SUCCESS(rv, rv);
  msgStream.forget(aResult);
  return NS_OK;
}

NS_IMETHODIMP nsMsgBrkMBoxStore::DeleteMessages(
    const nsTArray<RefPtr<nsIMsgDBHdr>>& aHdrArray) {
  return ChangeFlags(aHdrArray, nsMsgMessageFlags::Expunged, true);
}

NS_IMETHODIMP
nsMsgBrkMBoxStore::CopyMessages(bool isMove,
                                const nsTArray<RefPtr<nsIMsgDBHdr>>& aHdrArray,
                                nsIMsgFolder* aDstFolder,
                                nsTArray<RefPtr<nsIMsgDBHdr>>& aDstHdrs,
                                nsITransaction** aUndoAction, bool* aCopyDone) {
  NS_ENSURE_ARG_POINTER(aDstFolder);
  NS_ENSURE_ARG_POINTER(aCopyDone);
  aDstHdrs.Clear();
  *aUndoAction = nullptr;
  // We return false to indicate there's no shortcut. The calling code will
  // just have to perform the copy the hard way.
  *aCopyDone = false;
  return NS_OK;
}

NS_IMETHODIMP
nsMsgBrkMBoxStore::GetSupportsCompaction(bool* aSupportsCompaction) {
  NS_ENSURE_ARG_POINTER(aSupportsCompaction);
  *aSupportsCompaction = true;
  return NS_OK;
}

NS_IMETHODIMP nsMsgBrkMBoxStore::CompactFolder(nsIMsgFolder* aFolder,
                                               nsIUrlListener* aListener,
                                               nsIMsgWindow* aMsgWindow) {
  // Eventually, folder compaction should be managed by nsMsgBrkMBoxStore, but
  // for now it's separate (see nsMsgFolderCompactor) and invoked via the
  // folder methods Compact() and CompactAll().
  return NS_ERROR_NOT_IMPLEMENTED;
}

NS_IMETHODIMP nsMsgBrkMBoxStore::RebuildIndex(nsIMsgFolder* aFolder,
                                              nsIMsgDatabase* aMsgDB,
                                              nsIMsgWindow* aMsgWindow,
                                              nsIUrlListener* aListener) {
  NS_ENSURE_ARG_POINTER(aFolder);
  nsCOMPtr<nsIFile> pathFile;
  nsresult rv = aFolder->GetFilePath(getter_AddRefs(pathFile));
  if (NS_FAILED(rv)) return rv;

  bool isLocked;
  aFolder->GetLocked(&isLocked);
  if (isLocked) {
    NS_ASSERTION(false, "Could not get folder lock");
    return NS_MSG_FOLDER_BUSY;
  }

  nsCOMPtr<nsIMailboxService> mailboxService =
      do_GetService("@mozilla.org/messenger/mailboxservice;1", &rv);
  NS_ENSURE_SUCCESS(rv, rv);

  RefPtr<nsMsgMailboxParser> parser = new nsMsgMailboxParser(aFolder);
  NS_ENSURE_TRUE(parser, NS_ERROR_OUT_OF_MEMORY);
  rv = parser->Init();
  NS_ENSURE_SUCCESS(rv, rv);

  rv = mailboxService->ParseMailbox(aMsgWindow, pathFile, parser, aListener,
                                    nullptr);
  if (NS_SUCCEEDED(rv)) ResetForceReparse(aMsgDB);
  return rv;
}

nsresult nsMsgBrkMBoxStore::GetOutputStream(
    nsIMsgDBHdr* aHdr, nsCOMPtr<nsIOutputStream>& outputStream,
    nsCOMPtr<nsISeekableStream>& seekableStream, int64_t& restorePos) {
  nsCOMPtr<nsIMsgFolder> folder;
  nsresult rv = aHdr->GetFolder(getter_AddRefs(folder));
  NS_ENSURE_SUCCESS(rv, rv);
  nsCString URI;
  folder->GetURI(URI);
  restorePos = -1;
  if (m_outputStreams.Get(URI, getter_AddRefs(outputStream))) {
    seekableStream = do_QueryInterface(outputStream);
    rv = seekableStream->Tell(&restorePos);
    if (NS_FAILED(rv)) {
      outputStream = nullptr;
      m_outputStreams.Remove(URI);
    }
  }
  if (!outputStream) {
    nsCOMPtr<nsIFile> mboxFile;
    rv = folder->GetFilePath(getter_AddRefs(mboxFile));
    NS_ENSURE_SUCCESS(rv, rv);
    rv = MsgGetFileStream(mboxFile, getter_AddRefs(outputStream));
    seekableStream = do_QueryInterface(outputStream);
    if (NS_SUCCEEDED(rv)) m_outputStreams.InsertOrUpdate(URI, outputStream);
  }
  return rv;
}

void nsMsgBrkMBoxStore::SetDBValid(nsIMsgDBHdr* aHdr) {
  nsCOMPtr<nsIMsgFolder> folder;
  aHdr->GetFolder(getter_AddRefs(folder));
  if (folder) {
    nsCOMPtr<nsIMsgDatabase> db;
    folder->GetMsgDatabase(getter_AddRefs(db));
    if (db) SetSummaryFileValid(folder, db, true);
  }
}

NS_IMETHODIMP nsMsgBrkMBoxStore::ChangeFlags(
    const nsTArray<RefPtr<nsIMsgDBHdr>>& aHdrArray, uint32_t aFlags,
    bool aSet) {
  if (aHdrArray.IsEmpty()) return NS_ERROR_INVALID_ARG;

  nsCOMPtr<nsIOutputStream> outputStream;
  nsCOMPtr<nsISeekableStream> seekableStream;
  int64_t restoreStreamPos;
  nsresult rv = GetOutputStream(aHdrArray[0], outputStream, seekableStream,
                                restoreStreamPos);
  NS_ENSURE_SUCCESS(rv, rv);

  nsCOMPtr<nsIMsgDBHdr> msgHdr;
  for (auto msgHdr : aHdrArray) {
    // Work out the flags we want to write.
    uint32_t flags = 0;
    (void)msgHdr->GetFlags(&flags);
    flags &= ~(nsMsgMessageFlags::RuntimeOnly | nsMsgMessageFlags::Offline);
    if (aSet) {
      flags |= aFlags;
    } else {
      flags &= ~aFlags;
    }

    // Rewrite flags into X-Mozilla-Status headers.
    nsCOMPtr<nsISeekableStream> seekable(do_QueryInterface(outputStream, &rv));
    NS_ENSURE_SUCCESS(rv, rv);
    uint64_t msgOffset;
    rv = msgHdr->GetMessageOffset(&msgOffset);
    NS_ENSURE_SUCCESS(rv, rv);
    seekable->Seek(nsISeekableStream::NS_SEEK_SET, msgOffset);
    NS_ENSURE_SUCCESS(rv, rv);
    rv = RewriteMsgFlags(seekable, flags);
    if (NS_FAILED(rv)) {
      break;
    }
  }
  if (restoreStreamPos != -1)
    seekableStream->Seek(nsISeekableStream::NS_SEEK_SET, restoreStreamPos);
  else if (outputStream)
    outputStream->Close();
  SetDBValid(aHdrArray[0]);
  return NS_OK;
}

NS_IMETHODIMP nsMsgBrkMBoxStore::ChangeKeywords(
    const nsTArray<RefPtr<nsIMsgDBHdr>>& aHdrArray, const nsACString& aKeywords,
    bool aAdd) {
  if (aHdrArray.IsEmpty()) return NS_ERROR_INVALID_ARG;

  nsTArray<nsCString> keywordsToAdd;
  nsTArray<nsCString> keywordsToRemove;
  if (aAdd) {
    ParseString(aKeywords, ' ', keywordsToAdd);
  } else {
    ParseString(aKeywords, ' ', keywordsToRemove);
  }

  // Get the (possibly-cached) seekable & writable stream for this mbox.
  nsCOMPtr<nsIOutputStream> output;
  nsCOMPtr<nsISeekableStream> seekable;
  int64_t restoreStreamPos;
  nsresult rv =
      GetOutputStream(aHdrArray[0], output, seekable, restoreStreamPos);
  NS_ENSURE_SUCCESS(rv, rv);

  for (auto msgHdr : aHdrArray) {
    uint64_t msgStart;
    msgHdr->GetMessageOffset(&msgStart);
    seekable->Seek(nsISeekableStream::NS_SEEK_SET, msgStart);
    NS_ENSURE_SUCCESS(rv, rv);

    bool notEnoughRoom;
    rv = ChangeKeywordsHelper(seekable, keywordsToAdd, keywordsToRemove,
                              notEnoughRoom);

    NS_ENSURE_SUCCESS(rv, rv);
    if (notEnoughRoom) {
      // The growKeywords property indicates that the X-Mozilla-Keys header
      // doesn't have enough space, and should be rebuilt during the next
      // folder compaction.
      msgHdr->SetUint32Property("growKeywords", 1);
    }
  }

  if (restoreStreamPos != -1) {
    seekable->Seek(nsISeekableStream::NS_SEEK_SET, restoreStreamPos);
  } else if (output) {
    output->Close();
  }
  SetDBValid(aHdrArray[0]);
  return NS_OK;
}

NS_IMETHODIMP nsMsgBrkMBoxStore::GetStoreType(nsACString& aType) {
  aType.AssignLiteral("mbox");
  return NS_OK;
}

// Iterates over the files in the "path" directory, and adds subfolders to
// parent for each mailbox file found.
nsresult nsMsgBrkMBoxStore::AddSubFolders(nsIMsgFolder* parent,
                                          nsCOMPtr<nsIFile>& path, bool deep) {
  nsresult rv;
  nsCOMPtr<nsIFile> tmp;  // at top level so we can safely assign to path
  bool isDirectory;
  path->IsDirectory(&isDirectory);
  if (!isDirectory) {
    rv = path->Clone(getter_AddRefs(tmp));
    path = tmp;
    NS_ENSURE_SUCCESS(rv, rv);
    nsAutoString leafName;
    path->GetLeafName(leafName);
    leafName.AppendLiteral(FOLDER_SUFFIX);
    path->SetLeafName(leafName);
    path->IsDirectory(&isDirectory);
  }
  if (!isDirectory) return NS_OK;
  // first find out all the current subfolders and files, before using them
  // while creating new subfolders; we don't want to modify and iterate the same
  // directory at once.
  nsCOMArray<nsIFile> currentDirEntries;
  nsCOMPtr<nsIDirectoryEnumerator> directoryEnumerator;
  rv = path->GetDirectoryEntries(getter_AddRefs(directoryEnumerator));
  NS_ENSURE_SUCCESS(rv, rv);

  bool hasMore;
  while (NS_SUCCEEDED(directoryEnumerator->HasMoreElements(&hasMore)) &&
         hasMore) {
    nsCOMPtr<nsIFile> currentFile;
    rv = directoryEnumerator->GetNextFile(getter_AddRefs(currentFile));
    if (NS_SUCCEEDED(rv) && currentFile) {
      currentDirEntries.AppendObject(currentFile);
    }
  }

  // add the folders
  int32_t count = currentDirEntries.Count();
  for (int32_t i = 0; i < count; ++i) {
    nsCOMPtr<nsIFile> currentFile(currentDirEntries[i]);

    nsAutoString leafName;
    currentFile->GetLeafName(leafName);
    // here we should handle the case where the current file is a .sbd directory
    // w/o a matching folder file, or a directory w/o the name .sbd
    if (nsShouldIgnoreFile(leafName, currentFile)) continue;

    nsCOMPtr<nsIMsgFolder> child;
    rv = parent->AddSubfolder(leafName, getter_AddRefs(child));
    if (NS_FAILED(rv) && rv != NS_MSG_FOLDER_EXISTS) {
      return rv;
    }
    if (child) {
      nsString folderName;
      child->GetName(folderName);  // try to get it from cache/db
      if (folderName.IsEmpty()) child->SetPrettyName(leafName);
      if (deep) {
        nsCOMPtr<nsIFile> path;
        rv = child->GetFilePath(getter_AddRefs(path));
        NS_ENSURE_SUCCESS(rv, rv);
        rv = AddSubFolders(child, path, true);
        NS_ENSURE_SUCCESS(rv, rv);
      }
    }
  }
  return rv == NS_MSG_FOLDER_EXISTS ? NS_OK : rv;
}

/* Finds the directory associated with this folder.  That is if the path is
   c:\Inbox, it will return c:\Inbox.sbd if it succeeds.  If that path doesn't
   currently exist then it will create it. Path is strictly an out parameter.
  */
nsresult nsMsgBrkMBoxStore::CreateDirectoryForFolder(nsIFile* path) {
  nsresult rv = NS_OK;

  bool pathIsDirectory = false;
  path->IsDirectory(&pathIsDirectory);
  if (!pathIsDirectory) {
    // If the current path isn't a directory, add directory separator
    // and test it out.
    nsAutoString leafName;
    path->GetLeafName(leafName);
    leafName.AppendLiteral(FOLDER_SUFFIX);
    rv = path->SetLeafName(leafName);
    if (NS_FAILED(rv)) return rv;

    // If that doesn't exist, then we have to create this directory
    pathIsDirectory = false;
    path->IsDirectory(&pathIsDirectory);
    if (!pathIsDirectory) {
      bool pathExists;
      path->Exists(&pathExists);
      // If for some reason there's a file with the directory separator
      // then we are going to fail.
      rv = pathExists ? NS_MSG_COULD_NOT_CREATE_DIRECTORY
                      : path->Create(nsIFile::DIRECTORY_TYPE, 0700);
    }
  }
  return rv;
}

NS_IMETHODIMP
nsMsgBrkMBoxStore::SliceStream(nsIInputStream* inStream, uint64_t start,
                               uint32_t length, nsIInputStream** result) {
  nsCOMPtr<nsIInputStream> in(inStream);
  RefPtr<mozilla::SlicedInputStream> slicedStream =
      new mozilla::SlicedInputStream(in.forget(), start, uint64_t(length));
  slicedStream.forget(result);
  return NS_OK;
}