/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 *
 * The contents of this file are subject to the Netscape Public License
 * Version 1.0 (the "NPL"); you may not use this file except in
 * compliance with the NPL.  You may obtain a copy of the NPL at
 * http://www.mozilla.org/NPL/
 *
 * Software distributed under the NPL is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
 * for the specific language governing rights and limitations under the
 * NPL.
 *
 * The Initial Developer of this code under the NPL is Netscape
 * Communications Corporation.  Portions created by Netscape are
 * Copyright (C) 1998 Netscape Communications Corporation.  All Rights
 * Reserved.
 */

#include "IMETextTxn.h"
#include "IMECommitTxn.h"
#include "nsEditor.h"
#include "nsIDOMCharacterData.h"
#include "nsIDOMTextRange.h"
#include "nsIDOMTextRangeList.h"
#include "nsIDOMSelection.h"
#include "nsIPresShell.h"
#include "EditAggregateTxn.h"

static NS_DEFINE_IID(kIDOMSelectionIID, NS_IDOMSELECTION_IID);

nsIAtom *IMETextTxn::gIMETextTxnName = nsnull;

nsresult IMETextTxn::ClassInit()
{
  if (nsnull==gIMETextTxnName)
    gIMETextTxnName = NS_NewAtom("NS_IMETextTxn");
  return NS_OK;
}

IMETextTxn::IMETextTxn()
  : EditTxn()
{
}

IMETextTxn::~IMETextTxn()
{
	mRangeList = do_QueryInterface(nsnull);
}

NS_IMETHODIMP IMETextTxn::Init(nsIDOMCharacterData	*aElement,
                               PRUint32				aOffset,
							   PRUint32				aReplaceLength,
							   nsIDOMTextRangeList*	aTextRangeList,
                               const nsString		&aStringToInsert,
                               nsIPresShell			*aPresShell)
{
  mElement = do_QueryInterface(aElement);
  mOffset = aOffset;
  mReplaceLength = aReplaceLength;
  mStringToInsert = aStringToInsert;
  mPresShell = aPresShell;
  mRangeList = do_QueryInterface(aTextRangeList);
  mFixed = PR_FALSE;
  return NS_OK;
}

NS_IMETHODIMP IMETextTxn::Do(void)
{

#ifdef DEBUG_TAGUE
  printf("Do IME Text element = %p\n", mElement.get());
#endif

	// advance caret: This requires the presentation shell to get the selection.
	nsCOMPtr<nsIDOMSelection> selection;
	nsresult result = mPresShell->GetSelection(SELECTION_NORMAL, getter_AddRefs(selection));
	NS_ASSERTION(selection,"Could not get selection in IMEtextTxn::Do\n");
	if (NS_SUCCEEDED(result) && selection) {
		if (mReplaceLength==0) {
			result = mElement->InsertData(mOffset,mStringToInsert);
		} else {
			result = mElement->ReplaceData(mOffset,mReplaceLength,mStringToInsert);
		}
		if (NS_SUCCEEDED(result)) {
			result = CollapseTextSelection();
		}
	}

	return result;
}

NS_IMETHODIMP IMETextTxn::Undo(void)
{
#ifdef DEBUG_TAGUE
  printf("Undo IME Text element = %p\n", mElement.get());
#endif

  nsresult result;
  PRUint32 length = mStringToInsert.Length();
  result = mElement->DeleteData(mOffset, length);
  if (NS_SUCCEEDED(result))
  { // set the selection to the insertion point where the string was removed
    nsCOMPtr<nsIDOMSelection> selection;
    result = mPresShell->GetSelection(SELECTION_NORMAL, getter_AddRefs(selection));
    if (NS_SUCCEEDED(result) && selection) {
      result = selection->Collapse(mElement, mOffset);
      NS_ASSERTION((NS_SUCCEEDED(result)), "selection could not be collapsed after undo of IME insert.");
    }
  }
  return result;
}

NS_IMETHODIMP IMETextTxn::Merge(PRBool *aDidMerge, nsITransaction *aTransaction)
{
	nsresult	result;
#ifdef DEBUG_TAGUE
  printf("Merge IME Text element = %p\n", mElement.get());
#endif

	//
	// check to make sure we have valid return pointers
	//
	if ((nsnull==aDidMerge) && (nsnull==aTransaction))
	{
		return NS_OK;
	}

	// 
	// check to make sure we aren't fixed, if we are then nothing get's absorbed
	//
	if (mFixed) {
		*aDidMerge = PR_FALSE;
		return NS_OK;
	}

	//
	// if aTransaction is another IMETextTxn then absorbe it
	//
	IMETextTxn*	otherTxn = nsnull;
	result = aTransaction->QueryInterface(IMETextTxn::GetCID(),(void**)&otherTxn);
	if (otherTxn && result==NS_OK)
	{
		//
		//  we absorbe the next IME transaction by adopting it's insert string as our own
		//
		nsIDOMTextRangeList* newTextRangeList;
		otherTxn->GetData(mStringToInsert,&newTextRangeList);
		mRangeList = do_QueryInterface(newTextRangeList);
		*aDidMerge = PR_TRUE;
#ifdef DEBUG_TAGUE
		printf("IMETextTxn assimilated IMETextTxn:%p\n", aTransaction);
#endif
		NS_RELEASE(otherTxn);
		return NS_OK;
	}

	//
	// second possible case is that we have a commit transaction
	//
	IMECommitTxn* commitTxn = nsnull;
	result = aTransaction->QueryInterface(IMECommitTxn::GetCID(),(void**)&commitTxn);
	if (commitTxn && result==NS_OK)
	{
		(void)CollapseTextSelectionOnCommit();
		mFixed = PR_TRUE;
		*aDidMerge = PR_TRUE;	// absorbe the commit transaction
#ifdef DEBUG_TAGUE
		printf("IMETextTxn assimilated IMECommitTxn%p\n", aTransaction);
#endif
		NS_RELEASE(commitTxn);
		return NS_OK;
	}

	*aDidMerge = PR_FALSE;
	return NS_OK;
}

NS_IMETHODIMP IMETextTxn::Write(nsIOutputStream *aOutputStream)
{
  return NS_OK;
}

NS_IMETHODIMP IMETextTxn::GetUndoString(nsString *aString)
{
  if (nsnull!=aString)
  {
    *aString="Remove Text: ";
    *aString += mStringToInsert;
  }
  return NS_OK;
}

NS_IMETHODIMP IMETextTxn::GetRedoString(nsString *aString)
{
  if (nsnull!=aString)
  {
    *aString="Insert Text: ";
    *aString += mStringToInsert;
  }
  return NS_OK;
}

/* ============= nsISupports implementation ====================== */

NS_IMETHODIMP
IMETextTxn::QueryInterface(REFNSIID aIID, void** aInstancePtr)
{
  if (nsnull == aInstancePtr) {
    return NS_ERROR_NULL_POINTER;
  }
  if (aIID.Equals(IMETextTxn::GetCID())) {
    *aInstancePtr = (void*)(IMETextTxn*)this;
    NS_ADDREF_THIS();
    return NS_OK;
  }
  return (EditTxn::QueryInterface(aIID, aInstancePtr));
}

/* ============ protected methods ================== */

NS_IMETHODIMP IMETextTxn::GetData(nsString& aResult,nsIDOMTextRangeList** aTextRangeList)
{
  aResult = mStringToInsert;
  *aTextRangeList = mRangeList;
  return NS_OK;
}

NS_IMETHODIMP IMETextTxn::CollapseTextSelection(void)
{
		nsresult			result;
		PRBool				haveSelectedRange, haveCaretPosition;
		PRUint16			textRangeListLength,selectionStart,selectionEnd,
							textRangeType, caretPosition, i;
		nsIDOMTextRange*	textRange;

		haveSelectedRange = PR_FALSE;
		haveCaretPosition = PR_FALSE;
		

#ifdef DEBUG_tague
		PRUint16 listlen,start,stop,type;
		nsIDOMTextRange* rangePtr;
		result = mRangeList->GetLength(&listlen);
		printf("nsIDOMTextRangeList[%p]\n",mRangeList);
		for (i=0;i<listlen;i++) {
			(void)mRangeList->Item(i,&rangePtr);
			rangePtr->GetRangeStart(&start);
			rangePtr->GetRangeEnd(&stop);
			rangePtr->GetRangeType(&type);
			printf("range[%d] start=%d end=%d type=",i,start,stop,type);
			if (type==nsIDOMTextRange::TEXTRANGE_RAWINPUT) printf("TEXTRANGE_RAWINPUT\n");
			if (type==nsIDOMTextRange::TEXTRANGE_SELECTEDRAWTEXT) printf("TEXTRANGE_SELECTEDRAWTEXT\n");
			if (type==nsIDOMTextRange::TEXTRANGE_CONVERTEDTEXT) printf("TEXTRANGE_CONVERTEDTEXT\n");
			if (type==nsIDOMTextRange::TEXTRANGE_SELECTEDCONVERTEDTEXT) printf("TEXTRANGE_SELECTEDCONVERTEDTEXT\n");
		}
#endif
				
		//
		// run through the text range list
		//
		result = mRangeList->GetLength(&textRangeListLength);
		if (NS_SUCCEEDED(result)) 
		{
			for(i=0;i<textRangeListLength;i++) {
				result = mRangeList->Item(i,&textRange);
				if (NS_SUCCEEDED(result))
				{
					result = textRange->GetRangeType(&textRangeType);
					if (textRangeType==nsIDOMTextRange::TEXTRANGE_SELECTEDCONVERTEDTEXT) 
					{
						haveSelectedRange = PR_TRUE;
						textRange->GetRangeStart(&selectionStart);
						textRange->GetRangeEnd(&selectionEnd);
					}
					if (textRangeType==nsIDOMTextRange::TEXTRANGE_CARETPOSITION)
					{
						haveCaretPosition = PR_TRUE;
						textRange->GetRangeStart(&caretPosition);
					}
				}
			}
		}

		nsCOMPtr<nsIDOMSelection> selection;
		result = mPresShell->GetSelection(SELECTION_NORMAL, getter_AddRefs(selection));
		if (NS_SUCCEEDED(result) && selection){
			if (haveSelectedRange) {
				result = selection->Collapse(mElement,mOffset+selectionStart);
				result = selection->Extend(mElement,mOffset+selectionEnd);
			} else {
				if (haveCaretPosition)
					result = selection->Collapse(mElement,mOffset+caretPosition);
				else
					result = selection->Collapse(mElement,mOffset+mStringToInsert.Length());
			}
		}

		return result;
}

NS_IMETHODIMP IMETextTxn::CollapseTextSelectionOnCommit(void)
{
	nsCOMPtr<nsIDOMSelection> selection;
	nsresult result = mPresShell->GetSelection(SELECTION_NORMAL, getter_AddRefs(selection));
	if (NS_SUCCEEDED(result) && selection){
			result = selection->Collapse(mElement,mOffset+mStringToInsert.Length());
	}

	return result;
}