/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is mozilla mailnews.
 *
 * The Initial Developer of the Original Code is
 * Seth Spitzer <sspitzer@mozilla.org>.
 * Portions created by the Initial Developer are Copyright (C) 2004
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   David Bienvenu <bienvenu@nventure.com>
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

#include "nsIRssService.h"
#include "nsRssIncomingServer.h"
#include "nsMsgFolderFlags.h"
#include "nsINewsBlogFeedDownloader.h"
#include "nsIMsgMailSession.h"
#include "nsMsgBaseCID.h"

#include "nsIMsgLocalMailFolder.h"
#include "nsIDBFolderInfo.h"

nsrefcnt nsRssIncomingServer::gInstanceCount    = 0;

NS_IMPL_ISUPPORTS_INHERITED3(nsRssIncomingServer,
                             nsMsgIncomingServer,
                             nsIRssIncomingServer,
                             nsIFolderListener, 
                             nsILocalMailIncomingServer)

nsRssIncomingServer::nsRssIncomingServer() 
{
  m_canHaveFilters = PR_TRUE;

  if (gInstanceCount == 0) 
  {
    nsresult rv;
    nsCOMPtr<nsIMsgMailSession> mailSession = do_GetService(NS_MSGMAILSESSION_CONTRACTID, &rv); 

    if (NS_SUCCEEDED(rv))
      mailSession->AddFolderListener(this, nsIFolderListener::added);
  }

  gInstanceCount++;
}

nsRssIncomingServer::~nsRssIncomingServer()
{
  gInstanceCount--;
  
  // I used to have code here which unregistered the global rss folder listener with the
  // mail session. But the rss incoming server is held until shutdown when we shut down the 
  // account datasource. And at shutdown the mail session explicitly releases all of its folder listeners
  // anyway so this was effectively a no-op...
}

nsresult nsRssIncomingServer::FillInDataSourcePath(const nsAString& aDataSourceName, nsILocalFile ** aLocation)
{
  nsresult rv;
  // start by gettting the local path for this server
  nsCOMPtr<nsIFileSpec> localPathForServer;
  rv = GetLocalPath(getter_AddRefs(localPathForServer));
  NS_ENSURE_SUCCESS(rv, rv);

  // convert to a nsIFile
  nsCOMPtr<nsILocalFile> localFile;
  nsFileSpec pathSpec;
  localPathForServer->GetFileSpec(&pathSpec);
  rv = NS_FileSpecToIFile(&pathSpec, getter_AddRefs(localFile));
  NS_ENSURE_SUCCESS(rv, rv);

  // now append the name of the subscriptions data source
  rv = localFile->Append(aDataSourceName);
  NS_IF_ADDREF(*aLocation = localFile);
  return rv;
}

// nsIRSSIncomingServer methods
NS_IMETHODIMP nsRssIncomingServer::GetSubscriptionsDataSourcePath(nsILocalFile ** aLocation)
{
  return FillInDataSourcePath(NS_LITERAL_STRING("feeds.rdf"), aLocation);
}

NS_IMETHODIMP nsRssIncomingServer::GetFeedItemsDataSourcePath(nsILocalFile ** aLocation)
{
  return FillInDataSourcePath(NS_LITERAL_STRING("feeditems.rdf"), aLocation);
}

NS_IMETHODIMP nsRssIncomingServer::CreateDefaultMailboxes(nsIFileSpec *path)
{
    NS_ENSURE_ARG_POINTER(path);
    
    // for RSS, all we have is Trash
    // XXX or should we be use Local Folders/Trash?
    nsresult rv = path->AppendRelativeUnixPath("Trash");
    if (NS_FAILED(rv)) 
        return rv;
    
    PRBool exists;
    rv = path->Exists(&exists);
    if (!exists) 
    {
        rv = path->Touch();
        if (NS_FAILED(rv)) 
            return rv;
    }
    
    return NS_OK;
}

NS_IMETHODIMP nsRssIncomingServer::SetFlagsOnDefaultMailboxes()
{
    nsCOMPtr<nsIMsgFolder> rootFolder;
    nsresult rv = GetRootFolder(getter_AddRefs(rootFolder));
    NS_ENSURE_SUCCESS(rv, rv);

    nsCOMPtr<nsIMsgLocalMailFolder> localFolder =
        do_QueryInterface(rootFolder, &rv);
    NS_ENSURE_SUCCESS(rv, rv);

    localFolder->SetFlagsOnDefaultMailboxes(MSG_FOLDER_FLAG_TRASH);
    return NS_OK;
}

NS_IMETHODIMP nsRssIncomingServer::PerformBiff(nsIMsgWindow *aMsgWindow)
{
  // do we need to do anything here besides download articles
  // for each feed? I don't think we have a way to check a feed for new articles without actually
  // getting the articles. Do we need to SetPerformingBiff to true for this server? 
  nsresult rv;
  nsCOMPtr<nsIMsgFolder> rootRSSFolder;
  GetRootMsgFolder(getter_AddRefs(rootRSSFolder));

  // enumerate over the RSS folders and ping each one
  nsCOMPtr<nsISupportsArray> allDescendents;
  NS_NewISupportsArray(getter_AddRefs(allDescendents));
  rv = rootRSSFolder->ListDescendents(allDescendents);
  NS_ENSURE_SUCCESS(rv, rv);
  
  PRUint32 cnt =0;  
  allDescendents->Count(&cnt);

  nsCOMPtr<nsISupports> supports;
  nsCOMPtr<nsIUrlListener> urlListener;
  nsCOMPtr<nsIMsgFolder> rssFolder;

  for (PRUint32 index = 0; index < cnt; index++)
  {
    supports = getter_AddRefs(allDescendents->ElementAt(index));
    rssFolder = do_QueryInterface(supports, &rv);
    if (rssFolder)
    {
      urlListener = do_QueryInterface(rssFolder);
      // WARNING: Never call GetNewMail with the root folder or you will trigger an infinite loop...
      GetNewMail(aMsgWindow, urlListener, rssFolder, nsnull);
    }
  }

  return NS_OK;
}

NS_IMETHODIMP nsRssIncomingServer::GetNewMail(nsIMsgWindow *aMsgWindow, nsIUrlListener *aUrlListener, nsIMsgFolder *aFolder, nsIURI **_retval)
{
  NS_ENSURE_ARG_POINTER(aFolder);

  // before we even try to get New Mail, check to see if the passed in folder was the root folder.
  // If it was, then call PerformBiff which will properly walk through each RSS folder, asking it to check for new Mail.
  PRBool rootFolder = PR_FALSE;
  aFolder->GetIsServer(&rootFolder);
  if (rootFolder)
    return PerformBiff(aMsgWindow);
  
  PRBool valid = PR_FALSE;
  nsCOMPtr <nsIMsgDatabase> db;
  nsresult rv;
  nsCOMPtr <nsINewsBlogFeedDownloader> rssDownloader = do_GetService("@mozilla.org/newsblog-feed-downloader;1", &rv);
  NS_ENSURE_SUCCESS(rv, rv);
  rv = aFolder->GetMsgDatabase(aMsgWindow, getter_AddRefs(db));
  if (NS_SUCCEEDED(rv) && db)
  {
    rv = db->GetSummaryValid(&valid);
    NS_ASSERTION(valid, "db is invalid");
    if (valid)
    {
      nsCOMPtr <nsIDBFolderInfo> folderInfo;
      rv = db->GetDBFolderInfo(getter_AddRefs(folderInfo));
      if (folderInfo)
      {
        nsXPIDLCString url;
        nsXPIDLString folderName;
        aFolder->GetName(getter_Copies(folderName));
        folderInfo->GetCharPtrProperty("feedUrl", getter_Copies(url));

        rv = rssDownloader->DownloadFeed(url.get(), 
                                         aFolder, PR_FALSE, folderName.get(), aUrlListener, aMsgWindow);
      }
    }
  }
  return NS_OK;
}

NS_IMETHODIMP nsRssIncomingServer::GetLocalStoreType(char **type)
{
    NS_ENSURE_ARG_POINTER(type);
    *type = strdup("mailbox");
    return NS_OK;
}

NS_IMETHODIMP nsRssIncomingServer::GetAccountManagerChrome(nsAString& aResult)
{
    aResult.AssignLiteral("am-newsblog.xul");
    return NS_OK;
}

NS_IMETHODIMP nsRssIncomingServer::GetOfflineSupportLevel(PRInt32 *aSupportLevel)
{
  NS_ENSURE_ARG_POINTER(aSupportLevel);
  *aSupportLevel = OFFLINE_SUPPORT_LEVEL_NONE;
  return NS_OK;
}

NS_IMETHODIMP nsRssIncomingServer::GetSupportsDiskSpace(PRBool *aSupportsDiskSpace)
{
  NS_ENSURE_ARG_POINTER(aSupportsDiskSpace);
  *aSupportsDiskSpace = PR_FALSE;
  return NS_OK;
}

NS_IMETHODIMP nsRssIncomingServer::GetServerRequiresPasswordForBiff(PRBool *aServerRequiresPasswordForBiff)
{
  NS_ENSURE_ARG_POINTER(aServerRequiresPasswordForBiff);
  *aServerRequiresPasswordForBiff = PR_FALSE;  // for rss folders, we don't require a password
  return NS_OK;
}

NS_IMETHODIMP nsRssIncomingServer::GetCanSearchMessages(PRBool *canSearchMessages)
{
  NS_ENSURE_ARG_POINTER(canSearchMessages);
  *canSearchMessages = PR_TRUE;
  return NS_OK;
}

NS_IMETHODIMP nsRssIncomingServer::OnItemAdded(nsIRDFResource *parentItem, nsISupports *item)
{
  nsCOMPtr<nsIMsgFolder> folder = do_QueryInterface(item);
  // just kick out with a success code if the item in question is not a folder
  if (!folder)
    return NS_OK;

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

  nsXPIDLCString type; 
  rv = server->GetType(getter_Copies(type));
  NS_ENSURE_SUCCESS(rv, rv);
 
  if (type.Equals("rss"))
  {
    nsCOMPtr <nsINewsBlogFeedDownloader> rssDownloader = do_GetService("@mozilla.org/newsblog-feed-downloader;1", &rv);
    NS_ENSURE_SUCCESS(rv, rv);

    // did the user just delete this folder (adding it to trash?) 
    nsCOMPtr<nsIMsgFolder> rootMsgFolder;
    nsCOMPtr<nsIMsgFolder> trashFolder;
    rv = GetRootFolder(getter_AddRefs(rootMsgFolder));
    NS_ENSURE_SUCCESS(rv, rv);

    PRUint32 numFolders;
    rv = rootMsgFolder->GetFoldersWithFlag(MSG_FOLDER_FLAG_TRASH, 1, &numFolders, getter_AddRefs(trashFolder));
    
    PRBool unsubscribe = PR_FALSE;
    if (trashFolder)
      trashFolder->IsAncestorOf(folder, &unsubscribe);

    rssDownloader->UpdateSubscriptionsDS(folder, unsubscribe);

    // if the user was moving or deleting a set of nested folders, we only seem to get a single OnItemAdded
    // notification. So we need to iterate over all of the descedent folders of the folder whose location has
    // changed.

    nsCOMPtr<nsISupportsArray> allDescendents;
    NS_NewISupportsArray(getter_AddRefs(allDescendents));
    rv = folder->ListDescendents(allDescendents);
    NS_ENSURE_SUCCESS(rv, rv);

    PRUint32 cnt =0;  
    allDescendents->Count(&cnt);

    nsCOMPtr<nsISupports> supports;
    nsCOMPtr<nsIMsgFolder> rssFolder;

    for (PRUint32 index = 0; index < cnt; index++)
    {
      supports = getter_AddRefs(allDescendents->ElementAt(index));
      rssFolder = do_QueryInterface(supports, &rv);
      if (rssFolder)
        rssDownloader->UpdateSubscriptionsDS(rssFolder, unsubscribe);
    }
  }
         
  return rv;
}

NS_IMETHODIMP nsRssIncomingServer::OnItemRemoved(nsIRDFResource *parentItem, nsISupports *item)
{
 return NS_ERROR_NOT_IMPLEMENTED;
}

NS_IMETHODIMP nsRssIncomingServer::OnItemPropertyChanged(nsIRDFResource *item, nsIAtom *property, const char *oldValue, const char *newValue)
{
  return NS_ERROR_NOT_IMPLEMENTED;
}

NS_IMETHODIMP nsRssIncomingServer::OnItemIntPropertyChanged(nsIRDFResource *item, nsIAtom *property, PRInt32 oldValue, PRInt32 newValue)
{
  return NS_ERROR_NOT_IMPLEMENTED;
}

NS_IMETHODIMP nsRssIncomingServer::OnItemBoolPropertyChanged(nsIRDFResource *item, nsIAtom *property, PRBool oldValue, PRBool newValue)
{
  return NS_ERROR_NOT_IMPLEMENTED;
}

NS_IMETHODIMP nsRssIncomingServer::OnItemUnicharPropertyChanged(nsIRDFResource *item, nsIAtom *property, const PRUnichar *oldValue, const PRUnichar *newValue)
{
  return NS_ERROR_NOT_IMPLEMENTED;
}


NS_IMETHODIMP nsRssIncomingServer::OnItemPropertyFlagChanged(nsIMsgDBHdr *item, nsIAtom *property, PRUint32 oldFlag, PRUint32 newFlag)
{
  return NS_ERROR_NOT_IMPLEMENTED;
}

NS_IMETHODIMP nsRssIncomingServer::OnItemEvent(nsIMsgFolder *aFolder, nsIAtom *aEvent)
{
  return NS_ERROR_NOT_IMPLEMENTED;
}