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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* 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/. */

#include "nsMsgCopyService.h"
#include "nsCOMArray.h"
#include "nspr.h"
#include "nsIFile.h"
#include "nsIMsgFolderNotificationService.h"
#include "nsMsgBaseCID.h"
#include "nsIMutableArray.h"
#include "nsArrayUtils.h"
#include "nsComponentManagerUtils.h"
#include "nsServiceManagerUtils.h"
#include "nsMsgUtils.h"
#include "mozilla/Logging.h"

static mozilla::LazyLogModule gCopyServiceLog("MsgCopyService");

// ******************** nsCopySource ******************

nsCopySource::nsCopySource() : m_processed(false) {
  MOZ_COUNT_CTOR(nsCopySource);
  m_messageArray = do_CreateInstance(NS_ARRAY_CONTRACTID);
}

nsCopySource::nsCopySource(nsIMsgFolder* srcFolder) : m_processed(false) {
  MOZ_COUNT_CTOR(nsCopySource);
  m_messageArray = do_CreateInstance(NS_ARRAY_CONTRACTID);
  m_msgFolder = srcFolder;
}

nsCopySource::~nsCopySource() { MOZ_COUNT_DTOR(nsCopySource); }

void nsCopySource::AddMessage(nsIMsgDBHdr* aMsg) {
  m_messageArray->AppendElement(aMsg);
}

// ************ nsCopyRequest *****************
//

nsCopyRequest::nsCopyRequest()
    : m_requestType(nsCopyMessagesType),
      m_isMoveOrDraftOrTemplate(false),
      m_processed(false),
      m_newMsgFlags(0) {
  MOZ_COUNT_CTOR(nsCopyRequest);
}

nsCopyRequest::~nsCopyRequest() {
  MOZ_COUNT_DTOR(nsCopyRequest);

  int32_t j = m_copySourceArray.Length();
  while (j-- > 0) delete m_copySourceArray.ElementAt(j);
}

nsresult nsCopyRequest::Init(nsCopyRequestType type, nsISupports* aSupport,
                             nsIMsgFolder* dstFolder, bool bVal,
                             uint32_t newMsgFlags,
                             const nsACString& newMsgKeywords,
                             nsIMsgCopyServiceListener* listener,
                             nsIMsgWindow* msgWindow, bool allowUndo) {
  nsresult rv = NS_OK;
  m_requestType = type;
  m_srcSupport = aSupport;
  m_dstFolder = dstFolder;
  m_isMoveOrDraftOrTemplate = bVal;
  m_allowUndo = allowUndo;
  m_newMsgFlags = newMsgFlags;
  m_newMsgKeywords = newMsgKeywords;

  if (listener) m_listener = listener;
  if (msgWindow) {
    m_msgWindow = msgWindow;
    if (m_allowUndo) msgWindow->GetTransactionManager(getter_AddRefs(m_txnMgr));
  }
  if (type == nsCopyFoldersType) {
    // To support multiple copy folder operations to the same destination, we
    // need to save the leaf name of the src file spec so that FindRequest() is
    // able to find the right request when copy finishes.
    nsCOMPtr<nsIMsgFolder> srcFolder = do_QueryInterface(aSupport, &rv);
    NS_ENSURE_SUCCESS(rv, rv);
    nsString folderName;
    rv = srcFolder->GetName(folderName);
    NS_ENSURE_SUCCESS(rv, rv);
    m_dstFolderName = folderName;
  }

  return rv;
}

nsCopySource* nsCopyRequest::AddNewCopySource(nsIMsgFolder* srcFolder) {
  nsCopySource* newSrc = new nsCopySource(srcFolder);
  if (newSrc) {
    m_copySourceArray.AppendElement(newSrc);
    if (srcFolder == m_dstFolder) newSrc->m_processed = true;
  }
  return newSrc;
}

// ************* nsMsgCopyService ****************
//

nsMsgCopyService::nsMsgCopyService() {}

nsMsgCopyService::~nsMsgCopyService() {
  int32_t i = m_copyRequests.Length();

  while (i-- > 0) ClearRequest(m_copyRequests.ElementAt(i), NS_ERROR_FAILURE);
}

void nsMsgCopyService::LogCopyCompletion(nsISupports* aSrc,
                                         nsIMsgFolder* aDest) {
  nsCString srcFolderUri, destFolderUri;
  nsCOMPtr<nsIMsgFolder> srcFolder(do_QueryInterface(aSrc));
  if (srcFolder) srcFolder->GetURI(srcFolderUri);
  aDest->GetURI(destFolderUri);
  MOZ_LOG(gCopyServiceLog, mozilla::LogLevel::Info,
          ("NotifyCompletion - src %s dest %s\n", srcFolderUri.get(),
           destFolderUri.get()));
}

void nsMsgCopyService::LogCopyRequest(const char* logMsg,
                                      nsCopyRequest* aRequest) {
  nsCString srcFolderUri, destFolderUri;
  nsCOMPtr<nsIMsgFolder> srcFolder(do_QueryInterface(aRequest->m_srcSupport));
  if (srcFolder) srcFolder->GetURI(srcFolderUri);
  aRequest->m_dstFolder->GetURI(destFolderUri);
  uint32_t numMsgs = 0;
  if (aRequest->m_requestType == nsCopyMessagesType &&
      aRequest->m_copySourceArray.Length() > 0 &&
      aRequest->m_copySourceArray[0]->m_messageArray)
    aRequest->m_copySourceArray[0]->m_messageArray->GetLength(&numMsgs);
  MOZ_LOG(gCopyServiceLog, mozilla::LogLevel::Info,
          ("request %p %s - src %s dest %s numItems %d type=%d", aRequest,
           logMsg, srcFolderUri.get(), destFolderUri.get(), numMsgs,
           aRequest->m_requestType));
}

nsresult nsMsgCopyService::ClearRequest(nsCopyRequest* aRequest, nsresult rv) {
  if (aRequest) {
    if (MOZ_LOG_TEST(gCopyServiceLog, mozilla::LogLevel::Info))
      LogCopyRequest(
          NS_SUCCEEDED(rv) ? "Clearing OK request" : "Clearing failed request",
          aRequest);

    // Send notifications to nsIMsgFolderListeners
    if (NS_SUCCEEDED(rv) && aRequest->m_requestType == nsCopyFoldersType) {
      nsCOMPtr<nsIMsgFolderNotificationService> notifier(
          do_GetService(NS_MSGNOTIFICATIONSERVICE_CONTRACTID));
      if (notifier) {
        bool hasListeners;
        notifier->GetHasListeners(&hasListeners);
        if (hasListeners) {
          // Iterate over the copy sources and append their message arrays to
          // this mutable array or in the case of folders, the source folder.
          int32_t cnt, i;
          cnt = aRequest->m_copySourceArray.Length();
          for (i = 0; i < cnt; i++) {
            nsCopySource* copySource = aRequest->m_copySourceArray.ElementAt(i);
            notifier->NotifyFolderMoveCopyCompleted(
                aRequest->m_isMoveOrDraftOrTemplate, copySource->m_msgFolder,
                aRequest->m_dstFolder);
          }
        }
      }
    }

    // undo stuff
    if (aRequest->m_allowUndo && aRequest->m_copySourceArray.Length() > 1 &&
        aRequest->m_txnMgr)
      aRequest->m_txnMgr->EndBatch(false);

    m_copyRequests.RemoveElement(aRequest);
    if (aRequest->m_listener) aRequest->m_listener->OnStopCopy(rv);
    delete aRequest;
  }

  return rv;
}

nsresult nsMsgCopyService::QueueRequest(nsCopyRequest* aRequest,
                                        bool* aCopyImmediately) {
  NS_ENSURE_ARG_POINTER(aRequest);
  NS_ENSURE_ARG_POINTER(aCopyImmediately);
  *aCopyImmediately = true;
  nsCopyRequest* copyRequest;

  uint32_t cnt = m_copyRequests.Length();
  for (uint32_t i = 0; i < cnt; i++) {
    copyRequest = m_copyRequests.ElementAt(i);
    if (aRequest->m_requestType == nsCopyFoldersType) {
      // For copy folder, see if both destination folder (root)
      // (ie, Local Folder) and folder name (ie, abc) are the same.
      if (copyRequest->m_dstFolderName == aRequest->m_dstFolderName &&
          copyRequest->m_dstFolder.get() == aRequest->m_dstFolder.get()) {
        *aCopyImmediately = false;
        break;
      }
    } else if (copyRequest->m_dstFolder.get() == aRequest->m_dstFolder.get()) {
      // If dst are same and we already have a request, we cannot copy
      // immediately.
      *aCopyImmediately = false;
      break;
    }
  }
  return NS_OK;
}

nsresult nsMsgCopyService::DoCopy(nsCopyRequest* aRequest) {
  NS_ENSURE_ARG(aRequest);
  bool copyImmediately;
  QueueRequest(aRequest, &copyImmediately);
  m_copyRequests.AppendElement(aRequest);
  if (MOZ_LOG_TEST(gCopyServiceLog, mozilla::LogLevel::Info))
    LogCopyRequest(copyImmediately ? "DoCopy" : "QueueRequest", aRequest);

  // if no active request for this dest folder then we can copy immediately
  if (copyImmediately) return DoNextCopy();

  return NS_OK;
}

nsresult nsMsgCopyService::DoNextCopy() {
  nsresult rv = NS_OK;
  nsCopyRequest* copyRequest = nullptr;
  nsCopySource* copySource = nullptr;
  uint32_t i, j, scnt;

  uint32_t cnt = m_copyRequests.Length();
  if (cnt > 0) {
    nsCOMArray<nsIMsgFolder> activeTargets;

    // ** jt -- always FIFO
    for (i = 0; i < cnt; i++) {
      copyRequest = m_copyRequests.ElementAt(i);
      copySource = nullptr;
      scnt = copyRequest->m_copySourceArray.Length();
      if (!copyRequest->m_processed) {
        // if the target folder of this request already has an active
        // copy request, skip this request for now.
        if (activeTargets.ContainsObject(copyRequest->m_dstFolder)) {
          copyRequest = nullptr;
          continue;
        }
        if (scnt <= 0) goto found;  // must be CopyFileMessage
        for (j = 0; j < scnt; j++) {
          copySource = copyRequest->m_copySourceArray.ElementAt(j);
          if (!copySource->m_processed) goto found;
        }
        if (j >= scnt)  // all processed set the value
          copyRequest->m_processed = true;
      }
      if (copyRequest->m_processed) {
        // Keep track of folders actively getting copied to.
        activeTargets.AppendObject(copyRequest->m_dstFolder);
      }
    }
  found:
    if (copyRequest && !copyRequest->m_processed) {
      if (copyRequest->m_listener) copyRequest->m_listener->OnStartCopy();
      if (copyRequest->m_requestType == nsCopyMessagesType && copySource) {
        copySource->m_processed = true;
        rv = copyRequest->m_dstFolder->CopyMessages(
            copySource->m_msgFolder, copySource->m_messageArray,
            copyRequest->m_isMoveOrDraftOrTemplate, copyRequest->m_msgWindow,
            copyRequest->m_listener, false,
            copyRequest->m_allowUndo);  // isFolder operation false

      } else if (copyRequest->m_requestType == nsCopyFoldersType) {
        NS_ENSURE_STATE(copySource);
        copySource->m_processed = true;
        rv = copyRequest->m_dstFolder->CopyFolder(
            copySource->m_msgFolder, copyRequest->m_isMoveOrDraftOrTemplate,
            copyRequest->m_msgWindow, copyRequest->m_listener);
        // If it's a copy folder operation and the destination
        // folder already exists, CopyFolder() returns an error w/o sending
        // a completion notification, so clear it here.
        if (NS_FAILED(rv)) ClearRequest(copyRequest, rv);

      } else if (copyRequest->m_requestType == nsCopyFileMessageType) {
        nsCOMPtr<nsIFile> aFile(
            do_QueryInterface(copyRequest->m_srcSupport, &rv));
        if (NS_SUCCEEDED(rv)) {
          // ** in case of saving draft/template; the very first
          // time we may not have the original message to replace
          // with; if we do we shall have an instance of copySource
          nsCOMPtr<nsIMsgDBHdr> aMessage;
          if (copySource) {
            aMessage = do_QueryElementAt(copySource->m_messageArray, 0, &rv);
            copySource->m_processed = true;
          }
          copyRequest->m_processed = true;
          rv = copyRequest->m_dstFolder->CopyFileMessage(
              aFile, aMessage, copyRequest->m_isMoveOrDraftOrTemplate,
              copyRequest->m_newMsgFlags, copyRequest->m_newMsgKeywords,
              copyRequest->m_msgWindow, copyRequest->m_listener);
        }
      }
    }
  }
  return rv;
}

/**
 * Find a request in m_copyRequests which matches the passed in source
 * and destination folders.
 *
 * @param aSupport the iSupports of the source folder.
 * @param dstFolder the destination folder of the copy request.
 */
nsCopyRequest* nsMsgCopyService::FindRequest(nsISupports* aSupport,
                                             nsIMsgFolder* dstFolder) {
  nsCopyRequest* copyRequest = nullptr;
  uint32_t cnt = m_copyRequests.Length();
  for (uint32_t i = 0; i < cnt; i++) {
    copyRequest = m_copyRequests.ElementAt(i);
    if (copyRequest->m_srcSupport.get() == aSupport &&
        copyRequest->m_dstFolder.get() == dstFolder)
      break;

    // When copying folders the notification of the message copy serves as a
    // proxy for the folder copy. Check for that here.
    if (copyRequest->m_requestType == nsCopyFoldersType) {
      // If the src is different then check next request.
      if (copyRequest->m_srcSupport.get() != aSupport) {
        copyRequest = nullptr;
        continue;
      }

      // See if the parent of the copied folder is the same as the one when the
      // request was made. Note if the destination folder is already a server
      // folder then no need to get parent.
      nsCOMPtr<nsIMsgFolder> parentMsgFolder;
      nsresult rv = NS_OK;
      bool isServer = false;
      dstFolder->GetIsServer(&isServer);
      if (!isServer) rv = dstFolder->GetParent(getter_AddRefs(parentMsgFolder));
      if ((NS_FAILED(rv)) || (!parentMsgFolder && !isServer) ||
          (copyRequest->m_dstFolder.get() != parentMsgFolder)) {
        copyRequest = nullptr;
        continue;
      }

      // Now checks if the folder name is the same.
      nsString folderName;
      rv = dstFolder->GetName(folderName);
      if (NS_FAILED(rv)) {
        copyRequest = nullptr;
        continue;
      }

      if (copyRequest->m_dstFolderName == folderName) break;
    } else
      copyRequest = nullptr;
  }

  return copyRequest;
}

NS_IMPL_ISUPPORTS(nsMsgCopyService, nsIMsgCopyService)

NS_IMETHODIMP
nsMsgCopyService::CopyMessages(nsIMsgFolder* srcFolder, /* UI src folder */
                               nsIArray* messages, nsIMsgFolder* dstFolder,
                               bool isMove, nsIMsgCopyServiceListener* listener,
                               nsIMsgWindow* window, bool allowUndo) {
  NS_ENSURE_ARG_POINTER(srcFolder);
  NS_ENSURE_ARG_POINTER(messages);
  NS_ENSURE_ARG_POINTER(dstFolder);

  MOZ_LOG(gCopyServiceLog, mozilla::LogLevel::Debug, ("CopyMessages"));

  if (srcFolder == dstFolder) {
    NS_ERROR("src and dest folders for msg copy can't be the same");
    return NS_ERROR_FAILURE;
  }
  nsCopyRequest* copyRequest;
  nsCopySource* copySource = nullptr;
  nsCOMArray<nsIMsgDBHdr> msgArray;
  uint32_t cnt;
  nsCOMPtr<nsIMsgDBHdr> msg;
  nsCOMPtr<nsIMsgFolder> curFolder;
  nsCOMPtr<nsISupports> aSupport;
  nsresult rv;

  // XXX TODO
  // JUNK MAIL RELATED
  // make sure dest folder exists
  // and has proper flags, before we start copying?

  // bail early if nothing to do
  messages->GetLength(&cnt);
  if (!cnt) {
    if (listener) {
      listener->OnStartCopy();
      listener->OnStopCopy(NS_OK);
    }
    return NS_OK;
  }

  copyRequest = new nsCopyRequest();
  if (!copyRequest) return NS_ERROR_OUT_OF_MEMORY;

  aSupport = do_QueryInterface(srcFolder, &rv);

  rv = copyRequest->Init(nsCopyMessagesType, aSupport, dstFolder, isMove,
                         0 /* new msg flags, not used */, EmptyCString(),
                         listener, window, allowUndo);
  if (NS_FAILED(rv)) goto done;

  if (MOZ_LOG_TEST(gCopyServiceLog, mozilla::LogLevel::Info))
    LogCopyRequest("CopyMessages request", copyRequest);

  // duplicate the message array so we could sort the messages by it's
  // folder easily
  for (uint32_t i = 0; i < cnt; i++) {
    nsCOMPtr<nsIMsgDBHdr> currMsg = do_QueryElementAt(messages, i);
    msgArray.AppendObject(currMsg);
  }

  cnt = msgArray.Count();

  while (cnt-- > 0) {
    msg = msgArray[cnt];
    rv = msg->GetFolder(getter_AddRefs(curFolder));

    if (NS_FAILED(rv)) goto done;
    if (!copySource) {
      copySource = copyRequest->AddNewCopySource(curFolder);
      if (!copySource) {
        rv = NS_ERROR_OUT_OF_MEMORY;
        goto done;
      }
    }

    if (curFolder == copySource->m_msgFolder) {
      copySource->AddMessage(msg);
      msgArray.RemoveObjectAt(cnt);
    }

    if (cnt == 0) {
      cnt = msgArray.Count();
      if (cnt > 0) {
        // Force to create a new one and continue grouping the messages.
        copySource = nullptr;
      }
    }
  }

  // undo stuff
  if (NS_SUCCEEDED(rv) && copyRequest->m_allowUndo &&
      copyRequest->m_copySourceArray.Length() > 1 && copyRequest->m_txnMgr)
    copyRequest->m_txnMgr->BeginBatch(nullptr);

done:

  if (NS_FAILED(rv))
    delete copyRequest;
  else
    rv = DoCopy(copyRequest);

  return rv;
}

NS_IMETHODIMP
nsMsgCopyService::CopyFolders(nsIArray* folders, nsIMsgFolder* dstFolder,
                              bool isMove, nsIMsgCopyServiceListener* listener,
                              nsIMsgWindow* window) {
  NS_ENSURE_ARG_POINTER(folders);
  NS_ENSURE_ARG_POINTER(dstFolder);
  nsCopyRequest* copyRequest;
  nsCopySource* copySource = nullptr;
  nsresult rv;
  uint32_t cnt;
  nsCOMPtr<nsIMsgFolder> curFolder;
  nsCOMPtr<nsISupports> support;

  // If cnt is zero it cannot to get this point, will be detected earlier.
  rv = folders->GetLength(&cnt);
  if (cnt > 1)
    NS_ASSERTION((NS_SUCCEEDED(rv)), "More than one folders to copy");

  support = do_QueryElementAt(folders, 0);

  copyRequest = new nsCopyRequest();
  if (!copyRequest) return NS_ERROR_OUT_OF_MEMORY;

  rv = copyRequest->Init(nsCopyFoldersType, support, dstFolder, isMove,
                         0 /* new msg flags, not used */, EmptyCString(),
                         listener, window, false);
  NS_ENSURE_SUCCESS(rv, rv);

  curFolder = do_QueryInterface(support, &rv);
  NS_ENSURE_SUCCESS(rv, rv);

  copySource = copyRequest->AddNewCopySource(curFolder);
  if (!copySource) rv = NS_ERROR_OUT_OF_MEMORY;

  if (NS_FAILED(rv)) {
    delete copyRequest;
    NS_ENSURE_SUCCESS(rv, rv);
  } else
    rv = DoCopy(copyRequest);

  return rv;
}

NS_IMETHODIMP
nsMsgCopyService::CopyFileMessage(nsIFile* file, nsIMsgFolder* dstFolder,
                                  nsIMsgDBHdr* msgToReplace, bool isDraft,
                                  uint32_t aMsgFlags,
                                  const nsACString& aNewMsgKeywords,
                                  nsIMsgCopyServiceListener* listener,
                                  nsIMsgWindow* window) {
  nsresult rv = NS_ERROR_NULL_POINTER;
  nsCopyRequest* copyRequest;
  nsCopySource* copySource = nullptr;
  nsCOMPtr<nsISupports> fileSupport;
  nsCOMPtr<nsITransactionManager> txnMgr;

  NS_ENSURE_ARG_POINTER(file);
  NS_ENSURE_ARG_POINTER(dstFolder);

  if (window) window->GetTransactionManager(getter_AddRefs(txnMgr));
  copyRequest = new nsCopyRequest();
  if (!copyRequest) return rv;
  fileSupport = do_QueryInterface(file, &rv);
  if (NS_FAILED(rv)) goto done;

  rv = copyRequest->Init(nsCopyFileMessageType, fileSupport, dstFolder, isDraft,
                         aMsgFlags, aNewMsgKeywords, listener, window, false);
  if (NS_FAILED(rv)) goto done;

  if (msgToReplace) {
    // The actual source of the message is a file not a folder, but
    // we still need an nsCopySource to reference the old message header
    // which will be used to recover message metadata.
    copySource = copyRequest->AddNewCopySource(nullptr);
    if (!copySource) {
      rv = NS_ERROR_OUT_OF_MEMORY;
      goto done;
    }
    copySource->AddMessage(msgToReplace);
  }

done:
  if (NS_FAILED(rv)) {
    delete copyRequest;
  } else {
    rv = DoCopy(copyRequest);
  }

  return rv;
}

NS_IMETHODIMP
nsMsgCopyService::NotifyCompletion(nsISupports* aSupport,
                                   nsIMsgFolder* dstFolder, nsresult result) {
  if (MOZ_LOG_TEST(gCopyServiceLog, mozilla::LogLevel::Info))
    LogCopyCompletion(aSupport, dstFolder);
  nsCopyRequest* copyRequest = nullptr;
  uint32_t numOrigRequests = m_copyRequests.Length();
  do {
    // loop for copy requests, because if we do a cross server folder copy,
    // we'll have a copy request for the folder copy, which will in turn
    // generate a copy request for the messages in the folder, which
    // will have the same src support.
    copyRequest = FindRequest(aSupport, dstFolder);

    if (copyRequest) {
      // ClearRequest can cause a new request to get added to m_copyRequests
      // with matching source and dest folders if the copy listener starts
      // a new copy. We want to ignore any such request here, because it wasn't
      // the one that was completed. So we keep track of how many original
      // requests there were.
      if (m_copyRequests.IndexOf(copyRequest) >= numOrigRequests) break;
      // check if this copy request is done by making sure all the
      // sources have been processed.
      int32_t sourceIndex, sourceCount;
      sourceCount = copyRequest->m_copySourceArray.Length();
      for (sourceIndex = 0; sourceIndex < sourceCount;) {
        if (!(copyRequest->m_copySourceArray.ElementAt(sourceIndex))
                 ->m_processed)
          break;
        sourceIndex++;
      }
      // if all sources processed, mark the request as processed
      if (sourceIndex >= sourceCount) copyRequest->m_processed = true;
      // if this request is done, or failed, clear it.
      if (copyRequest->m_processed || NS_FAILED(result)) {
        ClearRequest(copyRequest, result);
        numOrigRequests--;
      } else
        break;
    } else
      break;
  } while (copyRequest);

  return DoNextCopy();
}