/* -*- 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/. */

/*
 * formerly listngst.cpp
 * This class should ultimately be part of a news group listing
 * state machine - either by inheritance or delegation.
 * Currently, a folder pane owns one and libnet news group listing
 * related messages get passed to this object.
 */

#include "msgCore.h"    // precompiled header...
#include "MailNewsTypes.h"
#include "nsCOMPtr.h"
#include "nsIDBFolderInfo.h"
#include "nsINewsDatabase.h"
#include "nsIMsgStatusFeedback.h"
#include "nsCOMPtr.h"
#include "nsIDOMWindow.h"
#include "nsIMsgMailNewsUrl.h"
#include "nsIMsgAccountManager.h"
#include "nsIMsgIncomingServer.h"
#include "nsINntpIncomingServer.h"
#include "nsMsgBaseCID.h"
#include "nsIMsgFilter.h"
#include "nsNNTPNewsgroupList.h"

#include "nsINNTPArticleList.h"
#include "nsMsgKeySet.h"

#include "nntpCore.h"
#include "nsIStringBundle.h"

#include "plstr.h"
#include "prmem.h"
#include "prprf.h"

#include "nsMsgUtils.h"

#include "nsMsgDatabase.h"

#include "nsIDBFolderInfo.h"

#include "nsNewsUtils.h"

#include "nsMsgDBCID.h"

#include "nsINewsDownloadDialogArgs.h"

#include "nsXPCOM.h"
#include "nsISupportsPrimitives.h"
#include "nsIInterfaceRequestor.h"
#include "nsIInterfaceRequestorUtils.h"
#include "nsIMsgWindow.h"
#include "nsIDocShell.h"
#include "nsIMutableArray.h"
#include "nsIMsgFolderNotificationService.h"
#include "nsIMsgFilterCustomAction.h"
#include "nsComponentManagerUtils.h"
#include "nsServiceManagerUtils.h"
#include "mozilla/Services.h"

// update status on header download once per second
#define MIN_STATUS_UPDATE_INTERVAL PRTime(PR_USEC_PER_SEC)


nsNNTPNewsgroupList::nsNNTPNewsgroupList()
  : m_finishingXover(false),
  m_getOldMessages(false),
  m_promptedAlready(false),
  m_downloadAll(false),
  m_maxArticles(0),
  m_lastPercent(-1),
  m_lastStatusUpdate(0),
  m_lastProcessedNumber(0),
  m_firstMsgNumber(0),
  m_lastMsgNumber(0),
  m_firstMsgToDownload(0),
  m_lastMsgToDownload(0),
  m_set(nullptr)
{
  memset(&m_knownArts, 0, sizeof(m_knownArts));
}

nsNNTPNewsgroupList::~nsNNTPNewsgroupList()
{
  CleanUp();
}

NS_IMPL_ISUPPORTS(nsNNTPNewsgroupList, nsINNTPNewsgroupList, nsIMsgFilterHitNotify)

nsresult
nsNNTPNewsgroupList::Initialize(nsINntpUrl *runningURL, nsIMsgNewsFolder *newsFolder)
{
  m_newsFolder = newsFolder;
  m_runningURL = runningURL;
  m_knownArts.set = nsMsgKeySet::Create();

  nsresult rv = m_newsFolder->GetDatabaseWithoutCache(getter_AddRefs(m_newsDB));
  NS_ENSURE_SUCCESS(rv, rv);

  nsCOMPtr <nsIMsgFolder> folder = do_QueryInterface(m_newsFolder, &rv);
  NS_ENSURE_SUCCESS(rv,rv);

  rv = folder->GetFilterList(m_msgWindow, getter_AddRefs(m_filterList));
  NS_ENSURE_SUCCESS(rv,rv);
  nsCString ngHeaders;
  m_filterList->GetArbitraryHeaders(ngHeaders);
  ParseString(ngHeaders, ' ', m_filterHeaders);

  nsCOMPtr<nsIMsgIncomingServer> server;
  rv = folder->GetServer(getter_AddRefs(server));
  NS_ENSURE_SUCCESS(rv,rv);

  rv = server->GetFilterList(m_msgWindow, getter_AddRefs(m_serverFilterList));
  NS_ENSURE_SUCCESS(rv,rv);
  nsAutoCString servHeaders;
  m_serverFilterList->GetArbitraryHeaders(servHeaders);

  nsTArray<nsCString> servArray;
  ParseString(servHeaders, ' ', servArray);

  // servArray may have duplicates already in m_filterHeaders.
  for (uint32_t i = 0; i < servArray.Length(); i++)
  {
    if (!m_filterHeaders.Contains(servArray[i]))
      m_filterHeaders.AppendElement(servArray[i]);
  }
  return NS_OK;
}

nsresult
nsNNTPNewsgroupList::CleanUp()
{
  // here we make sure that there aren't missing articles in the unread set
  // So if an article is the unread set, and the known arts set, but isn't in the
  // db, then we should mark it read in the unread set.
  if (m_newsDB)
  {
    if (m_knownArts.set && m_knownArts.set->getLength() && m_set->getLength())
    {
      nsCOMPtr <nsIDBFolderInfo> folderInfo;
      m_newsDB->GetDBFolderInfo(getter_AddRefs(folderInfo));
      int32_t firstKnown = m_knownArts.set->GetFirstMember();
      int32_t lastKnown =  m_knownArts.set->GetLastMember();
      if (folderInfo)
      {
        uint32_t lastMissingCheck;
        folderInfo->GetUint32Property("lastMissingCheck", 0, &lastMissingCheck);
        if (lastMissingCheck)
          firstKnown = lastMissingCheck + 1;
      }
      bool foundMissingArticle = false;
      while (firstKnown <= lastKnown)
      {
        int32_t firstUnreadStart, firstUnreadEnd;
        if (firstKnown == 0)
          firstKnown = 1;
        m_set->FirstMissingRange(firstKnown, lastKnown, &firstUnreadStart, &firstUnreadEnd);
        if (firstUnreadStart)
        {
          while (firstUnreadStart <= firstUnreadEnd)
          {
            bool containsKey;
            m_newsDB->ContainsKey(firstUnreadStart, &containsKey);
            if (!containsKey)
            {
              m_set->Add(firstUnreadStart);
              foundMissingArticle = true;
            }
            firstUnreadStart++;
          }
          firstKnown = firstUnreadStart;
        }
        else
          break;

      }
      if (folderInfo)
        folderInfo->SetUint32Property("lastMissingCheck", lastKnown);

      if (foundMissingArticle)
      {
        nsresult rv;
        nsCOMPtr<nsINewsDatabase> db(do_QueryInterface(m_newsDB, &rv));
        NS_ENSURE_SUCCESS(rv,rv);
        db->SetReadSet(m_set);
      }
    }
    m_newsDB->Commit(nsMsgDBCommitType::kSessionCommit);
    m_newsDB->Close(true);
    m_newsDB = nullptr;
  }

  if (m_knownArts.set)
  {
    delete m_knownArts.set;
    m_knownArts.set = nullptr;
  }
  if (m_newsFolder)
    m_newsFolder->NotifyFinishedDownloadinghdrs();

  m_newsFolder = nullptr;
  m_runningURL = nullptr;

  return NS_OK;
}

#ifdef HAVE_CHANGELISTENER
void nsNNTPNewsgroupList::OnAnnouncerGoingAway (ChangeAnnouncer *instigator)
{
}
#endif

static nsresult
openWindow(nsIMsgWindow *aMsgWindow, const char *chromeURL,
           nsINewsDownloadDialogArgs *param)
{
  nsresult rv;
  NS_ENSURE_ARG_POINTER(aMsgWindow);
  nsCOMPtr<nsIDocShell> docShell;
  rv = aMsgWindow->GetRootDocShell(getter_AddRefs(docShell));
  if (NS_FAILED(rv))
      return rv;

  nsCOMPtr<nsIDOMWindow> parentWindow(do_GetInterface(docShell));
  NS_ENSURE_TRUE(parentWindow, NS_ERROR_FAILURE);

  nsCOMPtr<nsISupportsInterfacePointer> ifptr = do_CreateInstance(NS_SUPPORTS_INTERFACE_POINTER_CONTRACTID, &rv);
  NS_ENSURE_SUCCESS(rv, rv);

  ifptr->SetData(param);
  ifptr->SetDataIID(&NS_GET_IID(nsINewsDownloadDialogArgs));

  nsCOMPtr<nsIDOMWindow> dialogWindow;
  rv = parentWindow->OpenDialog(NS_ConvertASCIItoUTF16(chromeURL),
                                NS_LITERAL_STRING("_blank"),
                                NS_LITERAL_STRING("centerscreen,chrome,modal,titlebar"),
                                ifptr, getter_AddRefs(dialogWindow));

  return rv;
}

nsresult
nsNNTPNewsgroupList::GetRangeOfArtsToDownload(nsIMsgWindow *aMsgWindow,
                                              int32_t first_possible,
                                              int32_t last_possible,
                                              int32_t maxextra,
                                              int32_t *first,
                                              int32_t *last,
                                              int32_t *status)
{
  nsresult rv = NS_OK;

  NS_ENSURE_ARG_POINTER(first);
  NS_ENSURE_ARG_POINTER(last);
  NS_ENSURE_ARG_POINTER(status);
  *first = 0;
  *last = 0;

  nsCOMPtr <nsIMsgFolder> folder = do_QueryInterface(m_newsFolder, &rv);
  NS_ENSURE_SUCCESS(rv,rv);
  m_msgWindow = aMsgWindow;

  nsCOMPtr<nsINewsDatabase> db(do_QueryInterface(m_newsDB, &rv));
  NS_ENSURE_SUCCESS(rv,rv);

  rv = db->GetReadSet(&m_set);
  if (NS_FAILED(rv) || !m_set)
    return rv;

  m_set->SetLastMember(last_possible); // make sure highwater mark is valid.

  nsCOMPtr <nsIDBFolderInfo> newsGroupInfo;
  rv = m_newsDB->GetDBFolderInfo(getter_AddRefs(newsGroupInfo));
  if (NS_SUCCEEDED(rv) && newsGroupInfo) {
    nsCString knownArtsString;
    nsMsgKey mark;
    newsGroupInfo->GetKnownArtsSet(getter_Copies(knownArtsString));

    rv = newsGroupInfo->GetHighWater(&mark);
    NS_ENSURE_SUCCESS(rv,rv);

    if (last_possible < ((int32_t)mark))
      newsGroupInfo->SetHighWater(last_possible);
    if (m_knownArts.set)
      delete m_knownArts.set;
    m_knownArts.set = nsMsgKeySet::Create(knownArtsString.get());
  }
  else
  {
    if (m_knownArts.set)
      delete m_knownArts.set;
    m_knownArts.set = nsMsgKeySet::Create();
    nsMsgKey low, high;
    rv = m_newsDB->GetLowWaterArticleNum(&low);
    NS_ENSURE_SUCCESS(rv,rv);
    rv = m_newsDB->GetHighWaterArticleNum(&high);
    NS_ENSURE_SUCCESS(rv,rv);
    m_knownArts.set->AddRange(low,high);
  }

  if (m_knownArts.set->IsMember(last_possible)) {
    nsString statusString;
    nsCOMPtr<nsIStringBundleService> bundleService =
      mozilla::services::GetStringBundleService();
    NS_ENSURE_TRUE(bundleService, NS_ERROR_UNEXPECTED);

    nsCOMPtr<nsIStringBundle> bundle;
    rv = bundleService->CreateBundle(NEWS_MSGS_URL, getter_AddRefs(bundle));
    NS_ENSURE_SUCCESS(rv, rv);

    rv = bundle->GetStringFromName(MOZ_UTF16("noNewMessages"), getter_Copies(statusString));
    NS_ENSURE_SUCCESS(rv, rv);

    SetProgressStatus(statusString.get());
  }

  if (maxextra <= 0 || last_possible < first_possible || last_possible < 1)
  {
    *status=0;
    return NS_OK;
  }

  m_knownArts.first_possible = first_possible;
  m_knownArts.last_possible = last_possible;

  nsCOMPtr <nsIMsgIncomingServer> server;
  rv = folder->GetServer(getter_AddRefs(server));
  NS_ENSURE_SUCCESS(rv,rv);

  nsCOMPtr<nsINntpIncomingServer> nntpServer = do_QueryInterface(server, &rv);
  NS_ENSURE_SUCCESS(rv,rv);

  /* Determine if we only want to get just new articles or more messages.
  If there are new articles at the end we haven't seen, we always want to get those first.
  Otherwise, we get the newest articles we haven't gotten, if we're getting more.
  My thought for now is that opening a newsgroup should only try to get new articles.
  Selecting "More Messages" will first try to get unseen messages, then old messages. */

  if (m_getOldMessages || !m_knownArts.set->IsMember(last_possible))
  {
    bool notifyMaxExceededOn = true;
    rv = nntpServer->GetNotifyOn(&notifyMaxExceededOn);
    if (NS_FAILED(rv)) notifyMaxExceededOn = true;

    // if the preference to notify when downloading more than x headers is not on,
    // and we're downloading new headers, set maxextra to a very large number.
    if (!m_getOldMessages && !notifyMaxExceededOn)
      maxextra = 0x7FFFFFFFL;
        int result =
            m_knownArts.set->LastMissingRange(first_possible, last_possible,
                                              first, last);
    if (result < 0) {
            *status=result;
      return NS_ERROR_NOT_INITIALIZED;
        }
    if (*first > 0 && *last - *first >= maxextra)
    {
      if (!m_getOldMessages && !m_promptedAlready && notifyMaxExceededOn)
      {
        m_downloadAll = false;
        nsCOMPtr<nsINewsDownloadDialogArgs> args = do_CreateInstance("@mozilla.org/messenger/newsdownloaddialogargs;1", &rv);
        if (NS_FAILED(rv)) return rv;
        NS_ENSURE_SUCCESS(rv,rv);

        rv = args->SetArticleCount(*last - *first + 1);
        NS_ENSURE_SUCCESS(rv,rv);

        nsString groupName;
        rv = m_newsFolder->GetUnicodeName(groupName);
        NS_ENSURE_SUCCESS(rv,rv);

        rv = args->SetGroupName(groupName);
        NS_ENSURE_SUCCESS(rv,rv);

        // get the server key
        nsCString serverKey;
        rv = server->GetKey(serverKey);
        NS_ENSURE_SUCCESS(rv,rv);

        rv = args->SetServerKey(serverKey.get());
        NS_ENSURE_SUCCESS(rv,rv);

        // we many not have a msgWindow if we are running an autosubscribe url from the browser
        // and there isn't a 3 pane open.
        //
        // if we don't have one, bad things will happen when we fail to open up the "download headers dialog"
        // (we will subscribe to the newsgroup, but it will appear like there are no messages!)
        //
        // for now, act like the "download headers dialog" came up, and the user hit cancel.  (very safe)
        //
        // TODO, figure out why we aren't opening and using a 3 pane when the autosubscribe url is run.
        // perhaps we can find an available 3 pane, and use it.

        bool download = false;

        if (aMsgWindow) {
          rv = openWindow(aMsgWindow, DOWNLOAD_HEADERS_URL, args);
          NS_ENSURE_SUCCESS(rv,rv);

          rv = args->GetHitOK(&download);
          NS_ENSURE_SUCCESS(rv,rv);
        }

      if (download) {
         rv = args->GetDownloadAll(&m_downloadAll);
         NS_ENSURE_SUCCESS(rv,rv);
         m_maxArticles = 0;
         rv = nntpServer->GetMaxArticles(&m_maxArticles);
         NS_ENSURE_SUCCESS(rv,rv);

          maxextra = m_maxArticles;
          if (!m_downloadAll)
          {
            bool markOldRead = false;

            rv = nntpServer->GetMarkOldRead(&markOldRead);
            if (NS_FAILED(rv)) markOldRead = false;

            if (markOldRead && m_set)
              m_set->AddRange(*first, *last - maxextra);
            *first = *last - maxextra + 1;
          }
        }
        else
          *first = *last = 0;
        m_promptedAlready = true;
      }
      else if (m_promptedAlready && !m_downloadAll)
        *first = *last - m_maxArticles + 1;
      else if (!m_downloadAll)
        *first = *last - maxextra + 1;
    }
  }

  m_firstMsgToDownload = *first;
  m_lastMsgToDownload = *last;
  *status=0;
  return NS_OK;
}

nsresult
nsNNTPNewsgroupList::AddToKnownArticles(int32_t first, int32_t last)
{
  nsresult status;

  if (!m_knownArts.set)
  {
    m_knownArts.set = nsMsgKeySet::Create();
    if (!m_knownArts.set)
      return NS_ERROR_OUT_OF_MEMORY;
  }

  // XXX Casting int to nsresult
  status = static_cast<nsresult>(m_knownArts.set->AddRange(first, last));

  if (m_newsDB) {
    nsresult rv = NS_OK;
    nsCOMPtr <nsIDBFolderInfo> newsGroupInfo;
    rv = m_newsDB->GetDBFolderInfo(getter_AddRefs(newsGroupInfo));
    if (NS_SUCCEEDED(rv) && newsGroupInfo) {
      nsCString output;
      status = m_knownArts.set->Output(getter_Copies(output));
      if (!output.IsEmpty())
        newsGroupInfo->SetKnownArtsSet(output.get());
    }
  }
  return status;
}

nsresult
nsNNTPNewsgroupList::InitXOVER(int32_t first_msg, int32_t last_msg)
{
  /* Consistency checks, not that I know what to do if it fails (it will
   probably handle it OK...) */
  NS_ASSERTION(first_msg <= last_msg, "first > last");

  /* If any XOVER lines from the last time failed to come in, mark those
     messages as read. */
  if (m_lastProcessedNumber < m_lastMsgNumber)
  {
    m_set->AddRange(m_lastProcessedNumber + 1, m_lastMsgNumber);
  }
  m_firstMsgNumber = first_msg;
  m_lastMsgNumber = last_msg;
  m_lastProcessedNumber = first_msg > 1 ? first_msg - 1 : 1;
  m_currentXHDRIndex = -1;
  return NS_OK;
}

// from RFC 822, don't translate
#define FROM_HEADER "From: "
#define SUBJECT_HEADER "Subject: "
#define DATE_HEADER "Date: "

nsresult
nsNNTPNewsgroupList::ParseLine(char *line, uint32_t * message_number)
{
  nsresult rv = NS_OK;
  nsCOMPtr <nsIMsgDBHdr> newMsgHdr;

  if (!line || !message_number) {
    return NS_ERROR_NULL_POINTER;
  }

  char *next = line;

#define GET_TOKEN()                           \
  line = next;                                \
  next = (line ? PL_strchr (line, '\t') : 0); \
  if (next) *next++ = 0

  GET_TOKEN (); /* message number */
  *message_number = atol(line);

  if (atol(line) == 0) /* bogus xover data */
    return NS_ERROR_UNEXPECTED;

  m_newsDB->CreateNewHdr(*message_number, getter_AddRefs(newMsgHdr));

  NS_ASSERTION(newMsgHdr, "CreateNewHdr didn't fail, but it returned a null newMsgHdr");
  if (!newMsgHdr)
    return NS_ERROR_NULL_POINTER;

  GET_TOKEN (); /* subject */
  if (line) {
    const char *subject = line;  /* #### const evilness */
    uint32_t subjectLen = strlen(line);

    uint32_t flags = 0;
    // ### should call IsHeaderRead here...
    /* strip "Re: " */
    nsCString modifiedSubject;
    if (NS_MsgStripRE(&subject, &subjectLen, getter_Copies(modifiedSubject)))
      (void) newMsgHdr->OrFlags(nsMsgMessageFlags::HasRe, &flags);
    
    // this will make sure read flags agree with newsrc
    if (! (flags & nsMsgMessageFlags::Read))
      rv = newMsgHdr->OrFlags(nsMsgMessageFlags::New, &flags);

    rv = newMsgHdr->SetSubject(modifiedSubject.IsEmpty() ? subject : modifiedSubject.get());

    if (NS_FAILED(rv))
      return rv;
  }

  GET_TOKEN (); /* author */
  if (line) {
    rv = newMsgHdr->SetAuthor(line);
    if (NS_FAILED(rv))
      return rv;
  }

  GET_TOKEN ();
  if (line) {
    PRTime date;
    PRStatus status = PR_ParseTimeString (line, false, &date);
    if (PR_SUCCESS == status) {
      rv = newMsgHdr->SetDate(date); /* date */
      if (NS_FAILED(rv))
        return rv;
    }
  }

  GET_TOKEN (); /* message id */
  if (line) {
    char *strippedId = line;
    if (strippedId[0] == '<')
      strippedId++;
    char * lastChar = strippedId + PL_strlen(strippedId) -1;

    if (*lastChar == '>')
      *lastChar = '\0';

    rv = newMsgHdr->SetMessageId(strippedId);
    if (NS_FAILED(rv))
      return rv;
  }

  GET_TOKEN (); /* references */
  if (line) {
    rv = newMsgHdr->SetReferences(line);
    if (NS_FAILED(rv))
      return rv;
  }

  GET_TOKEN (); /* bytes */
  if (line) {
    uint32_t msgSize = 0;
    msgSize = (line) ? atol (line) : 0;

    rv = newMsgHdr->SetMessageSize(msgSize);
    if (NS_FAILED(rv)) return rv;
  }

  GET_TOKEN (); /* lines */
  if (line) {
    uint32_t numLines = 0;
    numLines = line ? atol (line) : 0;
    rv = newMsgHdr->SetLineCount(numLines);
    if (NS_FAILED(rv)) return rv;
  }

  GET_TOKEN (); /* xref */

  m_newHeaders.AppendObject(newMsgHdr);
  return NS_OK;
}

NS_IMETHODIMP nsNNTPNewsgroupList::ApplyFilterHit(nsIMsgFilter *aFilter, nsIMsgWindow *aMsgWindow, bool *aApplyMore)
{
  NS_ENSURE_ARG_POINTER(aFilter);
  NS_ENSURE_ARG_POINTER(aApplyMore);
  NS_ENSURE_TRUE(m_newMsgHdr, NS_ERROR_UNEXPECTED);
  NS_ENSURE_TRUE(m_newsDB, NS_ERROR_UNEXPECTED);

  // you can't move news messages, so applyMore is always true
  *aApplyMore = true;

  nsCOMPtr<nsIArray> filterActionList;

  nsresult rv = aFilter->GetSortedActionList(getter_AddRefs(filterActionList));
  NS_ENSURE_SUCCESS(rv, rv);

  uint32_t numActions;
  rv = filterActionList->GetLength(&numActions);
  NS_ENSURE_SUCCESS(rv, rv);

  bool loggingEnabled = false;
  nsCOMPtr<nsIMsgFilterList> currentFilterList;
  rv = aFilter->GetFilterList(getter_AddRefs(currentFilterList));
  if (NS_SUCCEEDED(rv) && currentFilterList && numActions)
    currentFilterList->GetLoggingEnabled(&loggingEnabled);

  for (uint32_t actionIndex = 0; actionIndex < numActions; actionIndex++)
  {
    nsCOMPtr<nsIMsgRuleAction> filterAction;
    rv = filterActionList->QueryElementAt(actionIndex, NS_GET_IID(nsIMsgRuleAction),
                                                       getter_AddRefs(filterAction));
    if (NS_FAILED(rv) || !filterAction)
      continue;

    nsMsgRuleActionType actionType;
    if (NS_SUCCEEDED(filterAction->GetType(&actionType)))
    {
      if (loggingEnabled)
        (void) aFilter->LogRuleHit(filterAction, m_newMsgHdr);

      switch (actionType)
      {
      case nsMsgFilterAction::Delete:
        m_addHdrToDB = false;
        break;
      case nsMsgFilterAction::MarkRead:
        m_newsDB->MarkHdrRead(m_newMsgHdr, true, nullptr);
        break;
      case nsMsgFilterAction::MarkUnread:
        m_newsDB->MarkHdrRead(m_newMsgHdr, false, nullptr);
        break;
      case nsMsgFilterAction::KillThread:
        m_newMsgHdr->SetUint32Property("ProtoThreadFlags", nsMsgMessageFlags::Ignored);
        break;
      case nsMsgFilterAction::KillSubthread:
        {
          uint32_t newFlags;
          m_newMsgHdr->OrFlags(nsMsgMessageFlags::Ignored, &newFlags);
        }
        break;
      case nsMsgFilterAction::WatchThread:
        {
          uint32_t newFlags;
          m_newMsgHdr->OrFlags(nsMsgMessageFlags::Watched, &newFlags);
        }
        break;
      case nsMsgFilterAction::MarkFlagged:
        m_newMsgHdr->MarkFlagged(true);
        break;
      case nsMsgFilterAction::ChangePriority:
        {
          nsMsgPriorityValue filterPriority;
          filterAction->GetPriority(&filterPriority);
          m_newMsgHdr->SetPriority(filterPriority);
        }
        break;
      case nsMsgFilterAction::AddTag:
      {
        nsCString keyword;
        filterAction->GetStrValue(keyword);
        nsCOMPtr<nsIMutableArray> messageArray(do_CreateInstance(NS_ARRAY_CONTRACTID));
        messageArray->AppendElement(m_newMsgHdr, false);
        nsCOMPtr <nsIMsgFolder> folder = do_QueryInterface(m_newsFolder, &rv);
        if (folder)
          folder->AddKeywordsToMessages(messageArray, keyword);
        break;
      }
      case nsMsgFilterAction::Label:
        {
          nsMsgLabelValue filterLabel;
          filterAction->GetLabel(&filterLabel);
          nsMsgKey msgKey;
          m_newMsgHdr->GetMessageKey(&msgKey);
          m_newsDB->SetLabel(msgKey, filterLabel);
        }
        break;

      case nsMsgFilterAction::StopExecution:
      {
        // don't apply any more filters
        *aApplyMore = false;
      }
      break;

      case nsMsgFilterAction::Custom:
      {
        nsCOMPtr<nsIMsgFilterCustomAction> customAction;
        rv = filterAction->GetCustomAction(getter_AddRefs(customAction));
        NS_ENSURE_SUCCESS(rv, rv);

        nsAutoCString value;
        filterAction->GetStrValue(value);

        nsCOMPtr<nsIMutableArray> messageArray(
            do_CreateInstance(NS_ARRAY_CONTRACTID, &rv));
        NS_ENSURE_TRUE(messageArray, rv);
        messageArray->AppendElement(m_newMsgHdr, false);

        customAction->Apply(messageArray, value, nullptr,
                            nsMsgFilterType::NewsRule, aMsgWindow);
      }
      break;

      default:
        NS_ERROR("unexpected action");
        break;
      }
    }
  }
  return NS_OK;
}

nsresult
nsNNTPNewsgroupList::ProcessXOVERLINE(const char *line, uint32_t *status)
{
  uint32_t message_number=0;
  //  int32_t lines;
  bool read_p = false;
  nsresult rv = NS_OK;

  NS_ASSERTION(line, "null ptr");
  if (!line)
    return NS_ERROR_NULL_POINTER;

  if (m_newsDB)
  {
    char *xoverline = PL_strdup(line);
    if (!xoverline)
      return NS_ERROR_OUT_OF_MEMORY;
    rv = ParseLine(xoverline, &message_number);
    PL_strfree(xoverline);
    xoverline = nullptr;
    if (NS_FAILED(rv))
      return rv;
  }
  else
    return NS_ERROR_NOT_INITIALIZED;

  NS_ASSERTION(message_number > m_lastProcessedNumber ||
               message_number == 1, "bad message_number");
  if (m_set && message_number > m_lastProcessedNumber + 1)
  {
  /* There are some articles that XOVER skipped; they must no longer
     exist.  Mark them as read in the newsrc, so we don't include them
     next time in our estimated number of unread messages. */
    if (m_set->AddRange(m_lastProcessedNumber + 1, message_number - 1))
    {
    /* This isn't really an important enough change to warrant causing
       the newsrc file to be saved; we haven't gathered any information
       that won't also be gathered for free next time.  */
    }
  }

  m_lastProcessedNumber = message_number;
  if (m_knownArts.set)
  {
    int result = m_knownArts.set->Add(message_number);
    if (result < 0) {
      if (status)
        *status = result;
      return NS_ERROR_NOT_INITIALIZED;
    }
  }

  if (message_number > m_lastMsgNumber)
    m_lastMsgNumber = message_number;
  else if (message_number < m_firstMsgNumber)
    m_firstMsgNumber = message_number;

  if (m_set) {
    read_p = m_set->IsMember(message_number);
  }

  /* Update the progress meter with a percentage of articles retrieved */
  if (m_lastMsgNumber > m_firstMsgNumber)
  {
    int32_t totalToDownload = m_lastMsgToDownload - m_firstMsgToDownload + 1;
    int32_t lastIndex = m_lastProcessedNumber - m_firstMsgNumber + 1;
    int32_t numDownloaded = lastIndex;
    int32_t totIndex = m_lastMsgNumber - m_firstMsgNumber + 1;

    PRTime elapsedTime = PR_Now() - m_lastStatusUpdate;

    if (elapsedTime > MIN_STATUS_UPDATE_INTERVAL || lastIndex == totIndex)
      UpdateStatus(false, numDownloaded, totalToDownload);
  }
  return NS_OK;
}

nsresult
nsNNTPNewsgroupList::ResetXOVER()
{
  m_lastMsgNumber = m_firstMsgNumber;
  m_lastProcessedNumber = m_lastMsgNumber;
  return NS_OK;
}

nsresult
nsNNTPNewsgroupList::FinishXOVERLINE(int status, int *newstatus)
{
  nsresult rv;
  struct MSG_NewsKnown* k;

  /* If any XOVER lines from the last time failed to come in, mark those
     messages as read. */

  if (status >= 0 && m_lastProcessedNumber < m_lastMsgNumber) {
    m_set->AddRange(m_lastProcessedNumber + 1, m_lastMsgNumber);
  }

  if (m_lastProcessedNumber)
    AddToKnownArticles(m_firstMsgNumber, m_lastProcessedNumber);

  k = &m_knownArts;

  if (k && k->set)
  {
    int32_t n = k->set->FirstNonMember();
    if (n < k->first_possible || n > k->last_possible)
    {
      /* We know we've gotten all there is to know.
         Take advantage of that to update our counts... */
      // ### dmb
    }
  }

  if (!m_finishingXover)
  {
    // turn on m_finishingXover - this is a horrible hack to avoid recursive
    // calls which happen when the fe selects a message as a result of getting EndingUpdate,
    // which interrupts this url right before it was going to finish and causes FinishXOver
    // to get called again.
    m_finishingXover = true;

    // XXX is this correct?
    m_runningURL = nullptr;

    if (m_lastMsgNumber > 0) {
      nsAutoString firstStr;
      firstStr.AppendInt(m_lastProcessedNumber - m_firstMsgNumber + 1);

      nsAutoString lastStr;
      lastStr.AppendInt(m_lastMsgNumber - m_firstMsgNumber + 1);

      nsString statusString;
      nsCOMPtr<nsIStringBundleService> bundleService =
        mozilla::services::GetStringBundleService();
      NS_ENSURE_TRUE(bundleService, NS_ERROR_UNEXPECTED);

      nsCOMPtr<nsIStringBundle> bundle;
      rv = bundleService->CreateBundle(NEWS_MSGS_URL, getter_AddRefs(bundle));
      NS_ENSURE_SUCCESS(rv, rv);

      const char16_t *formatStrings[2] = { firstStr.get(), lastStr.get() };
      rv = bundle->FormatStringFromName(MOZ_UTF16("downloadingArticles"), formatStrings, 2, getter_Copies(statusString));
      NS_ENSURE_SUCCESS(rv, rv);

      SetProgressStatus(statusString.get());
    }
  }

  if (newstatus)
    *newstatus=0;

  return NS_OK;
}

NS_IMETHODIMP
nsNNTPNewsgroupList::InitXHDR(nsACString &header)
{
  if (++m_currentXHDRIndex >= m_filterHeaders.Length())
    header.Truncate();
  else
    header.Assign(m_filterHeaders[m_currentXHDRIndex]);
  // Don't include these in our XHDR bouts, as they are already provided through
  // XOVER. 
  if (header.EqualsLiteral("message-id") ||
      header.EqualsLiteral("references"))
    return InitXHDR(header);
  return NS_OK;
}

NS_IMETHODIMP
nsNNTPNewsgroupList::ProcessXHDRLine(const nsACString &line)
{
  int32_t middle = line.FindChar(' ');
  nsCString value, key = PromiseFlatCString(line);
  if (middle == -1)
    return NS_OK;
  value = Substring(line, middle+1);
  key.SetLength((uint32_t)middle);

  // According to RFC 2980, some will send (none) instead.
  // So we don't treat this is an error.
  if (key.CharAt(0) < '0' || key.CharAt(0) > '9')
    return NS_OK;

  nsresult rv;
  int32_t number = key.ToInteger(&rv);
  NS_ENSURE_SUCCESS(rv, NS_ERROR_FAILURE);
  // RFC 2980 specifies one or more spaces.
  value.Trim(" ");

  nsCOMPtr<nsIMsgDBHdr> header;
  rv = m_newsDB->GetMsgHdrForKey(number, getter_AddRefs(header));
  NS_ENSURE_SUCCESS(rv, rv);

  rv = header->SetStringProperty(m_filterHeaders[m_currentXHDRIndex].get(), value.get());
  NS_ENSURE_SUCCESS(rv, rv);

  int32_t totalToDownload = m_lastMsgToDownload - m_firstMsgToDownload + 1;
  int32_t numDownloaded = number - m_firstMsgNumber + 1;

  PRTime elapsedTime = PR_Now() - m_lastStatusUpdate;

  if (elapsedTime > MIN_STATUS_UPDATE_INTERVAL)
    UpdateStatus(true, numDownloaded, totalToDownload);
  return rv;
}

NS_IMETHODIMP
nsNNTPNewsgroupList::InitHEAD(int32_t number)
{
  if (m_newMsgHdr)
  {
    // Finish processing for this header
    // If HEAD didn't properly return, then the header won't be set
    m_newHeaders.AppendObject(m_newMsgHdr);

    int32_t totalToDownload = m_lastMsgToDownload - m_firstMsgToDownload + 1;
    int32_t lastIndex = m_lastProcessedNumber - m_firstMsgNumber + 1;
    int32_t numDownloaded = lastIndex;
    int32_t totIndex = m_lastMsgNumber - m_firstMsgNumber + 1;

    PRTime elapsedTime = PR_Now() - m_lastStatusUpdate;

    if (elapsedTime > MIN_STATUS_UPDATE_INTERVAL || lastIndex == totIndex)
      UpdateStatus(false, numDownloaded, totalToDownload);
  }

  if (number >= 0)
  {
    if (m_newHeaders.Count() > 0 && m_lastMsgNumber == m_lastProcessedNumber)
    {
      // We have done some processing of messages. This means that we have
      // relics of headers from XOVER. Since we will get everything from HEAD
      // anyways, just clear the array.
      m_newHeaders.Clear();
    }

    nsresult rv = m_newsDB->CreateNewHdr(number, getter_AddRefs(m_newMsgHdr));
    m_lastProcessedNumber = number;
    NS_ENSURE_SUCCESS(rv, rv);
  }
  else
  {
    AddToKnownArticles(m_firstMsgNumber, m_lastProcessedNumber);
  }
  return NS_OK;
}

NS_IMETHODIMP
nsNNTPNewsgroupList::HEADFailed(int32_t number)
{
  m_set->Add(number);
  return NS_OK;
}

NS_IMETHODIMP
nsNNTPNewsgroupList::ProcessHEADLine(const nsACString &line)
{
  int32_t colon = line.FindChar(':');
  nsCString header = PromiseFlatCString(line), value;
  if (colon != -1)
  {
    value = Substring(line, colon+1);
    header.SetLength((uint32_t)colon);
  }
  else if (line.CharAt(0) == ' ' || line.CharAt(0) == '\t') // We are continuing the header
  {
    m_thisLine += header; // Preserve whitespace (should we?)
    return NS_OK;
  }
  else
  {
    return NS_OK; // We are malformed. Just ignore and hope for the best...
  }
  
  nsresult rv;
  if (!m_lastHeader.IsEmpty())
  {
    rv = AddHeader(m_lastHeader.get(), m_thisLine.get());
    NS_ENSURE_SUCCESS(rv,rv);
  }
  
  value.Trim(" ");

  ToLowerCase(header, m_lastHeader);
  m_thisLine.Assign(value);
  return NS_OK;
}

nsresult
nsNNTPNewsgroupList::AddHeader(const char *header, const char *value)
{
  nsresult rv = NS_OK;
  // The From, Date, and Subject headers have special requirements.
  if (PL_strcmp(header, "from") == 0)
  {
    rv = m_newMsgHdr->SetAuthor(value);
  }
  else if (PL_strcmp(header, "date") == 0)
  {
    PRTime date;
    PRStatus status = PR_ParseTimeString (value, false, &date);
    if (PR_SUCCESS == status)
      rv = m_newMsgHdr->SetDate(date);
  }
  else if (PL_strcmp(header, "subject") == 0)
  {
    const char *subject = value;
    uint32_t subjectLen = strlen(value);

    uint32_t flags = 0;
    // ### should call IsHeaderRead here...
    /* strip "Re: " */
    nsCString modifiedSubject;
    if (NS_MsgStripRE(&subject, &subjectLen, getter_Copies(modifiedSubject)))
      // this will make sure read flags agree with newsrc
     (void) m_newMsgHdr->OrFlags(nsMsgMessageFlags::HasRe, &flags);

    if (! (flags & nsMsgMessageFlags::Read))
      rv = m_newMsgHdr->OrFlags(nsMsgMessageFlags::New, &flags);

    rv = m_newMsgHdr->SetSubject(modifiedSubject.IsEmpty() ? subject :
      modifiedSubject.get());
  }
  else if (PL_strcmp(header, "message-id") == 0)
  {
    rv = m_newMsgHdr->SetMessageId(value);
  }
  else if (PL_strcmp(header, "references") == 0)
  {
    rv = m_newMsgHdr->SetReferences(value);
  }
  else if (PL_strcmp(header, "bytes") == 0)
  {
    rv = m_newMsgHdr->SetMessageSize(atol(value));
  }
  else if (PL_strcmp(header, "lines") == 0)
  {
    rv = m_newMsgHdr->SetLineCount(atol(value));
  }
  else if (m_filterHeaders.Contains(nsDependentCString(header)))
  {
    rv = m_newMsgHdr->SetStringProperty(header, value);
  }
  return rv;
}

nsresult
nsNNTPNewsgroupList::CallFilters()
{
  nsresult rv;
  nsCString filterString;
  
  nsCOMPtr <nsIMsgFolder> folder = do_QueryInterface(m_newsFolder, &rv);
  NS_ENSURE_SUCCESS(rv,rv);

  uint32_t filterCount = 0;
  if (m_filterList)
  {
    rv = m_filterList->GetFilterCount(&filterCount);
    NS_ENSURE_SUCCESS(rv,rv);
  }

  uint32_t serverFilterCount = 0;
  if (m_serverFilterList)
  {
    rv = m_serverFilterList->GetFilterCount(&serverFilterCount);
    NS_ENSURE_SUCCESS(rv,rv);
  }

  uint32_t count = m_newHeaders.Count();

  // Notify MsgFolderListeners of message adds
  nsCOMPtr<nsIMsgFolderNotificationService> notifier(do_GetService(NS_MSGNOTIFICATIONSERVICE_CONTRACTID));

  for (uint32_t i = 0; i < count; i++)
  {
    m_newMsgHdr = m_newHeaders[i];
    if (!filterCount && !serverFilterCount)
    {
      m_newsDB->AddNewHdrToDB(m_newMsgHdr, true);

      if (notifier)
        notifier->NotifyMsgAdded(m_newMsgHdr);
      // mark the header as not yet reported classified
      nsMsgKey msgKey;
      m_newMsgHdr->GetMessageKey(&msgKey);
      folder->OrProcessingFlags(msgKey,
                                nsMsgProcessingFlags::NotReportedClassified);

      continue;
    }
    m_addHdrToDB = true;

    // build up a "headers" for filter code
    nsCString subject, author, date;
    rv = m_newMsgHdr->GetSubject(getter_Copies(subject));
    NS_ENSURE_SUCCESS(rv,rv);
    rv = m_newMsgHdr->GetAuthor(getter_Copies(author));
    NS_ENSURE_SUCCESS(rv,rv);

    nsCString fullHeaders;
    if (!(author.IsEmpty()))
    {
      fullHeaders.AppendLiteral(FROM_HEADER);
      fullHeaders += author;
      fullHeaders += '\0';
    }

    if (!(subject.IsEmpty()))
    {
      fullHeaders.AppendLiteral(SUBJECT_HEADER);
      fullHeaders += subject;
      fullHeaders += '\0';
    }

    for (uint32_t header = 0; header < m_filterHeaders.Length(); header++)
    {
      nsCString retValue;
      m_newMsgHdr->GetStringProperty(m_filterHeaders[header].get(),
                                     getter_Copies(retValue));
      if (!retValue.IsEmpty())
      {
        fullHeaders += m_filterHeaders[header];
        fullHeaders.AppendLiteral(": ");
        fullHeaders += retValue;
        fullHeaders += '\0';
      }
    }

    // The per-newsgroup filters should go first. If something stops filter
    // execution, then users should be able to override the global filters in
    // the per-newsgroup filters.
    if (filterCount)
    {
      rv = m_filterList->ApplyFiltersToHdr(nsMsgFilterType::NewsRule,
          m_newMsgHdr, folder, m_newsDB, fullHeaders.get(),
          fullHeaders.Length(), this, m_msgWindow);
    }
    if (serverFilterCount)
    {
      rv = m_serverFilterList->ApplyFiltersToHdr(nsMsgFilterType::NewsRule,
          m_newMsgHdr, folder, m_newsDB, fullHeaders.get(),
          fullHeaders.Length(), this, m_msgWindow);
    }

    NS_ENSURE_SUCCESS(rv,rv);

    if (m_addHdrToDB)
    {
      m_newsDB->AddNewHdrToDB(m_newMsgHdr, true);
      if (notifier)
        notifier->NotifyMsgAdded(m_newMsgHdr);
      // mark the header as not yet reported classified
      nsMsgKey msgKey;
      m_newMsgHdr->GetMessageKey(&msgKey);
      folder->OrProcessingFlags(msgKey,
                                nsMsgProcessingFlags::NotReportedClassified);
    }
  }
  m_newHeaders.Clear();
  return NS_OK;
}

void
nsNNTPNewsgroupList::SetProgressBarPercent(int32_t percent)
{
  if (!m_runningURL)
    return;

  nsCOMPtr <nsIMsgMailNewsUrl> mailnewsUrl = do_QueryInterface(m_runningURL);
  if (mailnewsUrl) {
    nsCOMPtr <nsIMsgStatusFeedback> feedback;
    mailnewsUrl->GetStatusFeedback(getter_AddRefs(feedback));

    if (feedback) {
      feedback->ShowProgress(percent);
    }
  }
}

void
nsNNTPNewsgroupList::SetProgressStatus(const char16_t *aMessage)
{
  if (!m_runningURL)
    return;

  nsCOMPtr <nsIMsgMailNewsUrl> mailnewsUrl = do_QueryInterface(m_runningURL);
  if (mailnewsUrl) {
    nsCOMPtr <nsIMsgStatusFeedback> feedback;
    mailnewsUrl->GetStatusFeedback(getter_AddRefs(feedback));

    if (feedback) {
      // prepending the account name to the status message.
      nsresult rv;
      nsCOMPtr <nsIMsgIncomingServer> server;
      rv = mailnewsUrl->GetServer(getter_AddRefs(server));
      NS_ENSURE_SUCCESS_VOID(rv);
      nsString accountName;
      server->GetPrettyName(accountName);
      nsString statusMessage;
      nsCOMPtr<nsIStringBundleService> sbs =
        mozilla::services::GetStringBundleService();
      nsCOMPtr<nsIStringBundle> bundle;
      rv = sbs->CreateBundle(MSGS_URL,
                             getter_AddRefs(bundle));
      NS_ENSURE_SUCCESS_VOID(rv);
      const char16_t *params[] = { accountName.get(), aMessage };
      bundle->FormatStringFromName(MOZ_UTF16("statusMessage"),
                                   params, 2, getter_Copies(statusMessage));

      feedback->ShowStatusString(statusMessage);
    }
  }
}

void
nsNNTPNewsgroupList::UpdateStatus(bool filtering, int32_t numDLed, int32_t totToDL)
{
  int32_t numerator = (filtering ? m_currentXHDRIndex + 1 : 1) * numDLed;
  int32_t denominator = (m_filterHeaders.Length() + 1) * totToDL;
  int32_t percent = numerator * 100 / denominator;
  
  nsAutoString numDownloadedStr;
  numDownloadedStr.AppendInt(numDLed);

  nsAutoString totalToDownloadStr;
  totalToDownloadStr.AppendInt(totToDL);

  nsAutoString newsgroupName;
  nsresult rv = m_newsFolder->GetUnicodeName(newsgroupName);
  if (!NS_SUCCEEDED(rv))
      return;

  nsString statusString;
  nsCOMPtr<nsIStringBundleService> bundleService =
    mozilla::services::GetStringBundleService();
  if (!bundleService)
    return;

  nsCOMPtr<nsIStringBundle> bundle;
  rv = bundleService->CreateBundle(NEWS_MSGS_URL, getter_AddRefs(bundle));
  if (!NS_SUCCEEDED(rv))
    return;

  if (filtering)
  {
    NS_ConvertUTF8toUTF16 header(m_filterHeaders[m_currentXHDRIndex]);
    const char16_t *formatStrings[4] = { header.get(),
      numDownloadedStr.get(), totalToDownloadStr.get(), newsgroupName.get() };
    rv = bundle->FormatStringFromName(MOZ_UTF16("newNewsgroupFilteringHeaders"),
      formatStrings, 4, getter_Copies(statusString));
  }
  else
  {
    const char16_t *formatStrings[3] = { numDownloadedStr.get(),
      totalToDownloadStr.get(), newsgroupName.get() };
    rv = bundle->FormatStringFromName(MOZ_UTF16("newNewsgroupHeaders"),
      formatStrings, 3, getter_Copies(statusString));
  }
  if (!NS_SUCCEEDED(rv))
    return;

  SetProgressStatus(statusString.get());
  m_lastStatusUpdate = PR_Now();

  // only update the progress meter if it has changed
  if (percent != m_lastPercent)
  {
    SetProgressBarPercent(percent);
    m_lastPercent = percent;
  }
}

NS_IMETHODIMP nsNNTPNewsgroupList::SetGetOldMessages(bool aGetOldMessages)
{
  m_getOldMessages = aGetOldMessages;
  return NS_OK;
}

NS_IMETHODIMP nsNNTPNewsgroupList::GetGetOldMessages(bool *aGetOldMessages)
{
  NS_ENSURE_ARG(aGetOldMessages);

  *aGetOldMessages = m_getOldMessages;
  return NS_OK;
}
