/*
 *	clipboard helper functions
 *
 *	Copyright 2000	Juergen Schmied <juergen.schmied@debitel.de>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * NOTES:
 *
 * For copy & paste functions within contextmenus does the shell use
 * the OLE clipboard functions in combination with dataobjects.
 * The OLE32.DLL gets loaded with LoadLibrary
 *
 * - a right mousebutton-copy sets the following formats:
 *  classic:
 *	Shell IDList Array
 *	Prefered Drop Effect
 *	Shell Object Offsets
 *	HDROP
 *	FileName
 *  ole:
 *	OlePrivateData (ClipboardDataObjectInterface)
 *
 */

#include <string.h>

#include "winreg.h"
#include "pidl.h"
#include "undocshell.h"
#include "shell32_main.h"
#include "shlwapi.h"

#include "wine/debug.h"

WINE_DEFAULT_DEBUG_CHANNEL(shell);

HRESULT (WINAPI *pOleInitialize)(LPVOID reserved);
void    (WINAPI *pOleUninitialize)(void);
HRESULT (WINAPI *pRegisterDragDrop)(HWND hwnd, IDropTarget* pDropTarget);
HRESULT (WINAPI *pRevokeDragDrop)(HWND hwnd);
HRESULT (WINAPI *pDoDragDrop)(LPDATAOBJECT,LPDROPSOURCE,DWORD,DWORD*);
void 	(WINAPI *pReleaseStgMedium)(STGMEDIUM* pmedium);
HRESULT (WINAPI *pOleSetClipboard)(IDataObject* pDataObj);
HRESULT (WINAPI *pOleGetClipboard)(IDataObject** ppDataObj);

/**************************************************************************
 * GetShellOle
 *
 * make sure OLE32.DLL is loaded
 */
BOOL GetShellOle(void)
{
    static HANDLE hOle32 = NULL;
    if(!hOle32)
    {
        hOle32 = LoadLibraryA("ole32.dll");
        if(hOle32)
        {
            pOleInitialize=(void*)GetProcAddress(hOle32,"OleInitialize");
            pOleUninitialize=(void*)GetProcAddress(hOle32,"OleUninitialize");
            pRegisterDragDrop=(void*)GetProcAddress(hOle32,"RegisterDragDrop");
            pRevokeDragDrop=(void*)GetProcAddress(hOle32,"RevokeDragDrop");
            pDoDragDrop=(void*)GetProcAddress(hOle32,"DoDragDrop");
            pReleaseStgMedium=(void*)GetProcAddress(hOle32,"ReleaseStgMedium");
            pOleSetClipboard=(void*)GetProcAddress(hOle32,"OleSetClipboard");
            pOleGetClipboard=(void*)GetProcAddress(hOle32,"OleGetClipboard");

            pOleInitialize(NULL);
        }
    }
    return TRUE;
}

/**************************************************************************
 * RenderHDROP
 *
 * creates a CF_HDROP structure
 */
HGLOBAL RenderHDROP(LPITEMIDLIST pidlRoot, LPITEMIDLIST * apidl, UINT cidl)
{
	UINT i;
	int rootsize = 0,size = 0;
	char szRootPath[MAX_PATH];
	char szFileName[MAX_PATH];
	HGLOBAL hGlobal;
	DROPFILES *pDropFiles;
	int offset;

	TRACE("(%p,%p,%u)\n", pidlRoot, apidl, cidl);

	/* get the size needed */
	size = sizeof(DROPFILES);

	SHGetPathFromIDListA(pidlRoot, szRootPath);
	PathAddBackslashA(szRootPath);
	rootsize = strlen(szRootPath);

	for (i=0; i<cidl;i++)
	{
	  _ILSimpleGetText(apidl[i], szFileName, MAX_PATH);
	  size += rootsize + strlen(szFileName) + 1;
	}

	size++;

	/* Fill the structure */
	hGlobal = GlobalAlloc(GHND|GMEM_SHARE, size);
	if(!hGlobal) return hGlobal;

        pDropFiles = (DROPFILES *)GlobalLock(hGlobal);
        pDropFiles->pFiles = sizeof(DROPFILES);
        pDropFiles->fWide = FALSE;

	offset = pDropFiles->pFiles;
	strcpy(szFileName, szRootPath);

	for (i=0; i<cidl;i++)
	{

	  _ILSimpleGetText(apidl[i], szFileName + rootsize, MAX_PATH - rootsize);
	  size = strlen(szFileName) + 1;
	  strcpy(((char*)pDropFiles)+offset, szFileName);
	  offset += size;
	}

	((char*)pDropFiles)[offset] = 0;
	GlobalUnlock(hGlobal);

	return hGlobal;
}

HGLOBAL RenderSHELLIDLIST (LPITEMIDLIST pidlRoot, LPITEMIDLIST * apidl, UINT cidl)
{
	UINT i;
	int offset = 0, sizePidl, size;
	HGLOBAL hGlobal;
	LPIDA	pcida;

	TRACE("(%p,%p,%u)\n", pidlRoot, apidl, cidl);

	/* get the size needed */
	size = sizeof(CIDA) + sizeof (UINT)*(cidl);	/* header */
	size += ILGetSize (pidlRoot);			/* root pidl */
	for(i=0; i<cidl; i++)
	{
	  size += ILGetSize(apidl[i]);			/* child pidls */
	}

	/* fill the structure */
	hGlobal = GlobalAlloc(GHND|GMEM_SHARE, size);
	if(!hGlobal) return hGlobal;
	pcida = GlobalLock (hGlobal);
	pcida->cidl = cidl;

	/* root pidl */
	offset = sizeof(CIDA) + sizeof (UINT)*(cidl);
	pcida->aoffset[0] = offset;			/* first element */
	sizePidl = ILGetSize (pidlRoot);
	memcpy(((LPBYTE)pcida)+offset, pidlRoot, sizePidl);
	offset += sizePidl;

	for(i=0; i<cidl; i++)				/* child pidls */
	{
	  pcida->aoffset[i+1] = offset;
	  sizePidl = ILGetSize(apidl[i]);
	  memcpy(((LPBYTE)pcida)+offset, apidl[i], sizePidl);
	  offset += sizePidl;
	}

	GlobalUnlock(hGlobal);
	return hGlobal;
}

HGLOBAL RenderSHELLIDLISTOFFSET (LPITEMIDLIST pidlRoot, LPITEMIDLIST * apidl, UINT cidl)
{
	FIXME("\n");
	return 0;
}

HGLOBAL RenderFILECONTENTS (LPITEMIDLIST pidlRoot, LPITEMIDLIST * apidl, UINT cidl)
{
	FIXME("\n");
	return 0;
}

HGLOBAL RenderFILEDESCRIPTOR (LPITEMIDLIST pidlRoot, LPITEMIDLIST * apidl, UINT cidl)
{
	FIXME("\n");
	return 0;
}

HGLOBAL RenderFILENAME (LPITEMIDLIST pidlRoot, LPITEMIDLIST * apidl, UINT cidl)
{
	int len, size = 0;
	char szTemp[MAX_PATH], *szFileName;
	HGLOBAL hGlobal;

	TRACE("(%p,%p,%u)\n", pidlRoot, apidl, cidl);

	/* build name of first file */
	SHGetPathFromIDListA(pidlRoot, szTemp);
	PathAddBackslashA(szTemp);
	len = strlen(szTemp);
	_ILSimpleGetText(apidl[0], szTemp+len, MAX_PATH - len);
	size = strlen(szTemp) + 1;

	/* fill the structure */
	hGlobal = GlobalAlloc(GHND|GMEM_SHARE, size);
	if(!hGlobal) return hGlobal;
        szFileName = (char *)GlobalLock(hGlobal);
	GlobalUnlock(hGlobal);
	return hGlobal;
}

HGLOBAL RenderPREFEREDDROPEFFECT (DWORD dwFlags)
{
	DWORD * pdwFlag;
	HGLOBAL hGlobal;

	TRACE("(0x%08lx)\n", dwFlags);

	hGlobal = GlobalAlloc(GHND|GMEM_SHARE, sizeof(DWORD));
	if(!hGlobal) return hGlobal;
        pdwFlag = (DWORD*)GlobalLock(hGlobal);
	*pdwFlag = dwFlags;
	GlobalUnlock(hGlobal);
	return hGlobal;
}

/**************************************************************************
 * IsDataInClipboard
 *
 * checks if there is something in the clipboard we can use
 */
BOOL IsDataInClipboard (HWND hwnd)
{
	BOOL ret = FALSE;

	if (OpenClipboard(hwnd))
	{
	  if (GetOpenClipboardWindow())
	  {
	    ret = IsClipboardFormatAvailable(CF_TEXT);
	  }
	  CloseClipboard();
	}
	return ret;
}