/*
 *	IEnumFORMATETC, IDataObject
 *
 * selecting and droping objects within the shell and/or common dialogs
 *
 *	Copyright 1998, 1999	<juergen.schmied@metronet.de>
 */
#include <string.h>

#include "oleidl.h"
#include "pidl.h"
#include "winerror.h"
#include "shell32_main.h"
#include "debugtools.h"
#include "wine/undocshell.h"
#include "wine/obj_dataobject.h"

DEFAULT_DEBUG_CHANNEL(shell)

/***********************************************************************
*   IEnumFORMATETC implementation
*/

typedef struct 
{
    /* IUnknown fields */
    ICOM_VFIELD(IEnumFORMATETC);
    DWORD                        ref;
    /* IEnumFORMATETC fields */
    UINT        posFmt;
    UINT        countFmt;
    LPFORMATETC pFmt;
} IEnumFORMATETCImpl;

static HRESULT WINAPI IEnumFORMATETC_fnQueryInterface(LPENUMFORMATETC iface, REFIID riid, LPVOID* ppvObj);
static ULONG WINAPI IEnumFORMATETC_fnAddRef(LPENUMFORMATETC iface);
static ULONG WINAPI IEnumFORMATETC_fnRelease(LPENUMFORMATETC iface);
static HRESULT WINAPI IEnumFORMATETC_fnNext(LPENUMFORMATETC iface, ULONG celt, FORMATETC* rgelt, ULONG* pceltFethed);
static HRESULT WINAPI IEnumFORMATETC_fnSkip(LPENUMFORMATETC iface, ULONG celt);
static HRESULT WINAPI IEnumFORMATETC_fnReset(LPENUMFORMATETC iface);
static HRESULT WINAPI IEnumFORMATETC_fnClone(LPENUMFORMATETC iface, LPENUMFORMATETC* ppenum);

static struct ICOM_VTABLE(IEnumFORMATETC) efvt = 
{
    ICOM_MSVTABLE_COMPAT_DummyRTTIVALUE
        IEnumFORMATETC_fnQueryInterface,
        IEnumFORMATETC_fnAddRef,
    IEnumFORMATETC_fnRelease,
    IEnumFORMATETC_fnNext,
    IEnumFORMATETC_fnSkip,
    IEnumFORMATETC_fnReset,
    IEnumFORMATETC_fnClone
};

LPENUMFORMATETC IEnumFORMATETC_Constructor(UINT cfmt, const FORMATETC afmt[])
{
	IEnumFORMATETCImpl* ef;
	DWORD size=cfmt * sizeof(FORMATETC);
	
	ef=(IEnumFORMATETCImpl*)HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(IEnumFORMATETCImpl));

	if(ef)
	{
	  ef->ref=1;
	  ICOM_VTBL(ef)=&efvt;

	  ef->countFmt = cfmt;
	  ef->pFmt = SHAlloc (size);

	  if (ef->pFmt)
	  {
	    memcpy(ef->pFmt, afmt, size);
	  }

	  shell32_ObjCount++;
	}

	TRACE("(%p)->()\n",ef);
	return (LPENUMFORMATETC)ef;
}
static HRESULT WINAPI IEnumFORMATETC_fnQueryInterface(LPENUMFORMATETC iface, REFIID riid, LPVOID* ppvObj)
{
	ICOM_THIS(IEnumFORMATETCImpl,iface);
	TRACE("(%p)->(\n\tIID:\t%s,%p)\n",This,debugstr_guid(riid),ppvObj);

			*ppvObj = NULL;

	if(IsEqualIID(riid, &IID_IUnknown))
	{ *ppvObj = This; 
	}
	else if(IsEqualIID(riid, &IID_IEnumFORMATETC))
	{ *ppvObj = (IDataObject*)This;
	}   

	if(*ppvObj)
	{ IEnumFORMATETC_AddRef((IEnumFORMATETC*)*ppvObj);
	  TRACE("-- Interface: (%p)->(%p)\n",ppvObj,*ppvObj);
	  return S_OK;
	}
	TRACE("-- Interface: E_NOINTERFACE\n");
	return E_NOINTERFACE;

}
static ULONG WINAPI IEnumFORMATETC_fnAddRef(LPENUMFORMATETC iface)
{
	ICOM_THIS(IEnumFORMATETCImpl,iface);
	TRACE("(%p)->(count=%lu)\n",This, This->ref);
	shell32_ObjCount++;
	return ++(This->ref);
}
static ULONG WINAPI IEnumFORMATETC_fnRelease(LPENUMFORMATETC iface)
{
	ICOM_THIS(IEnumFORMATETCImpl,iface);
	TRACE("(%p)->()\n",This);

	shell32_ObjCount--;

	if (!--(This->ref)) 
	{ TRACE(" destroying IEnumFORMATETC(%p)\n",This);
	  if (This->pFmt)
	  { SHFree (This->pFmt);
	  }
	  HeapFree(GetProcessHeap(),0,This);
	  return 0;
	}
	return This->ref;
}
static HRESULT WINAPI IEnumFORMATETC_fnNext(LPENUMFORMATETC iface, ULONG celt, FORMATETC *rgelt, ULONG *pceltFethed)
{
	ICOM_THIS(IEnumFORMATETCImpl,iface);
	UINT cfetch;
	HRESULT hres = S_FALSE;

	TRACE("(%p)->()\n", This);

	if (This->posFmt < This->countFmt)
	{
	  cfetch = This->countFmt - This->posFmt;
	  if (cfetch >= celt)
	  {
	    cfetch = celt;
	    hres = S_OK;
	  }
	  memcpy(rgelt, &This->pFmt[This->posFmt], cfetch * sizeof(FORMATETC));
	  This->posFmt += cfetch;
	}
	else
	{
	  cfetch = 0;
	}

	if (pceltFethed)
	{
	  *pceltFethed = cfetch;
	}

        return hres;
}
static HRESULT WINAPI IEnumFORMATETC_fnSkip(LPENUMFORMATETC iface, ULONG celt)
{
	ICOM_THIS(IEnumFORMATETCImpl,iface);
	FIXME("(%p)->(num=%lu)\n", This, celt);

	This->posFmt += celt;
	if (This->posFmt > This->countFmt)
	{
	  This->posFmt = This->countFmt;
	  return S_FALSE;
	}
	return S_OK;
}
static HRESULT WINAPI IEnumFORMATETC_fnReset(LPENUMFORMATETC iface)
{
	ICOM_THIS(IEnumFORMATETCImpl,iface);
	FIXME("(%p)->()\n", This);

        This->posFmt = 0;
        return S_OK;
}
static HRESULT WINAPI IEnumFORMATETC_fnClone(LPENUMFORMATETC iface, LPENUMFORMATETC* ppenum)
{
	ICOM_THIS(IEnumFORMATETCImpl,iface);
	FIXME("(%p)->(ppenum=%p)\n", This, ppenum);
	return E_NOTIMPL;
}

/**************************************************************************
 *  IDLList "Item ID List List"
 *
 *  NOTES
 *   interal data holder for IDataObject
 */
#define STDMETHOD(xfn) HRESULT (CALLBACK *fn##xfn)
#define STDMETHOD_(type,xfn) type (CALLBACK *fn##xfn)
#define THIS_ THIS,

typedef struct tagLPIDLLIST *LPIDLLIST, IDLList;

#define THIS LPIDLLIST me
typedef enum
{ State_UnInit=1,
  State_Init=2,
  State_OutOfMem=3
} IDLListState;

typedef struct IDLList_VTable
{ STDMETHOD_(UINT, GetState)(THIS);
  STDMETHOD_(LPITEMIDLIST, GetElement)(THIS_ UINT nIndex);
  STDMETHOD_(UINT, GetCount)(THIS);
  STDMETHOD_(BOOL, StoreItem)(THIS_ LPITEMIDLIST pidl);
  STDMETHOD_(BOOL, AddItems)(THIS_ LPITEMIDLIST *apidl, UINT cidl);
  STDMETHOD_(BOOL, InitList)(THIS);
  STDMETHOD_(void, CleanList)(THIS);
} IDLList_VTable,*LPIDLLIST_VTABLE;

struct tagLPIDLLIST
{ LPIDLLIST_VTABLE  lpvtbl;
  HDPA  dpa;
  UINT  uStep;
};

extern LPIDLLIST IDLList_Constructor (UINT uStep);
extern void IDLList_Destructor(LPIDLLIST me);
#undef THIS


/**************************************************************************
 *  IDLList "Item ID List List"
 * 
 */
static UINT WINAPI IDLList_GetState(LPIDLLIST this);
static LPITEMIDLIST WINAPI IDLList_GetElement(LPIDLLIST this, UINT nIndex);
static UINT WINAPI IDLList_GetCount(LPIDLLIST this);
static BOOL WINAPI IDLList_StoreItem(LPIDLLIST this, LPITEMIDLIST pidl);
static BOOL WINAPI IDLList_AddItems(LPIDLLIST this, LPITEMIDLIST *apidl, UINT cidl);
static BOOL WINAPI IDLList_InitList(LPIDLLIST this);
static void WINAPI IDLList_CleanList(LPIDLLIST this);

static IDLList_VTable idllvt = 
{	IDLList_GetState,
	IDLList_GetElement,
	IDLList_GetCount,
	IDLList_StoreItem,
	IDLList_AddItems,
	IDLList_InitList,
	IDLList_CleanList
};

LPIDLLIST IDLList_Constructor (UINT uStep)
{
	LPIDLLIST lpidll;
	lpidll = (LPIDLLIST)HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(IDLList));

	if (lpidll)
	{
	  lpidll->lpvtbl=&idllvt;
	  lpidll->uStep=uStep;
	}

	TRACE("(%p)\n",lpidll);
	return lpidll;
}
void IDLList_Destructor(LPIDLLIST this)
{	TRACE("(%p)\n",this);
	IDLList_CleanList(this);
}
 
static UINT WINAPI IDLList_GetState(LPIDLLIST this)
{	TRACE("(%p)->(uStep=%u dpa=%p)\n",this, this->uStep, this->dpa);

	if (this->uStep == 0)
	{
	  if (this->dpa)
	    return(State_Init);

	  return(State_OutOfMem);
	}
	return(State_UnInit);
}
static LPITEMIDLIST WINAPI IDLList_GetElement(LPIDLLIST this, UINT nIndex)
{	TRACE("(%p)->(index=%u)\n",this, nIndex);
	return((LPITEMIDLIST)pDPA_GetPtr(this->dpa, nIndex));
}
static UINT WINAPI IDLList_GetCount(LPIDLLIST this)
{	TRACE("(%p)\n",this);
	return(IDLList_GetState(this)==State_Init ? DPA_GetPtrCount(this->dpa) : 0);
}
static BOOL WINAPI IDLList_StoreItem(LPIDLLIST this, LPITEMIDLIST pidl)
{	TRACE("(%p)->(pidl=%p)\n",this, pidl);
	if (pidl)
        { if (IDLList_InitList(this) && pDPA_InsertPtr(this->dpa, 0x7fff, (LPSTR)pidl)>=0)
	    return(TRUE);
	  ILFree(pidl);
        }
        IDLList_CleanList(this);
        return(FALSE);
}
static BOOL WINAPI IDLList_AddItems(LPIDLLIST this, LPITEMIDLIST *apidl, UINT cidl)
{	INT i;
	TRACE("(%p)->(apidl=%p cidl=%u)\n",this, apidl, cidl);

	for (i=0; i<cidl; ++i)
        { if (!IDLList_StoreItem(this, ILClone((LPCITEMIDLIST)apidl[i])))
	    return(FALSE);
        }
        return(TRUE);
}
static BOOL WINAPI IDLList_InitList(LPIDLLIST this)
{	TRACE("(%p)\n",this);
	switch (IDLList_GetState(this))
        { case State_Init:
	    return(TRUE);

	  case State_OutOfMem:
	    return(FALSE);

	  case State_UnInit:
	  default:
	    this->dpa = pDPA_Create(this->uStep);
	    this->uStep = 0;
	    return(IDLList_InitList(this));
        }
}
static void WINAPI IDLList_CleanList(LPIDLLIST this)
{	INT i;
	TRACE("(%p)\n",this);

	if (this->uStep != 0)
        { this->dpa = NULL;
	  this->uStep = 0;
	  return;
        }

        if (!this->dpa)
        { return;
        }

        for (i=DPA_GetPtrCount(this->dpa)-1; i>=0; --i)
        { ILFree(IDLList_GetElement(this,i));
        }

        pDPA_Destroy(this->dpa);
        this->dpa=NULL;
}        


/***********************************************************************
*   IDataObject implementation
*/
/* number of supported formats */
#define MAX_FORMATS 1

typedef struct
{
	/* IUnknown fields */
	ICOM_VFIELD(IDataObject);
	DWORD		ref;

	/* IDataObject fields */
	LPIDLLIST	lpill;       /* the data of the dataobject */
	LPITEMIDLIST	pidl;

	FORMATETC	pFormatEtc[MAX_FORMATS];
	UINT		cfShellIDList;
	UINT		cfFileGroupDesc;
	UINT		cfFileContents;

} IDataObjectImpl;

static struct ICOM_VTABLE(IDataObject) dtovt;

/**************************************************************************
*  IDataObject_Constructor
*/
LPDATAOBJECT IDataObject_Constructor(HWND hwndOwner, LPITEMIDLIST pMyPidl, LPITEMIDLIST * apidl, UINT cidl)
{
	IDataObjectImpl* dto;

	dto = (IDataObjectImpl*)HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(IDataObjectImpl));

	if (dto)
	{
	  dto->ref=1;
	  ICOM_VTBL(dto)=&dtovt;
	  dto->pidl=ILClone(pMyPidl);

	  /* fill the ItemID List List */
	  dto->lpill = IDLList_Constructor (8);
	  if (! dto->lpill )
	    return NULL;
	  
	  dto->lpill->lpvtbl->fnAddItems(dto->lpill, apidl, cidl); 

	  /* */
	  dto->cfShellIDList = RegisterClipboardFormatA(CFSTR_SHELLIDLIST);
/*	  dto->cfFileGroupDesc = RegisterClipboardFormatA(CFSTR_FILEDESCRIPTORA);
	  dto->cfFileContents = RegisterClipboardFormatA(CFSTR_FILECONTENTS);
*/
	  InitFormatEtc(dto->pFormatEtc[0], dto->cfShellIDList, TYMED_HGLOBAL);

	  shell32_ObjCount++;
	}
	
	TRACE("(%p)->(apidl=%p cidl=%u)\n",dto, apidl, cidl);
	return (LPDATAOBJECT)dto;
}
/***************************************************************************
*  IDataObject_QueryInterface
*/
static HRESULT WINAPI IDataObject_fnQueryInterface(LPDATAOBJECT iface, REFIID riid, LPVOID * ppvObj)
{
	ICOM_THIS(IDataObjectImpl,iface);
	TRACE("(%p)->(\n\tIID:\t%s,%p)\n",This,debugstr_guid(riid),ppvObj);

	*ppvObj = NULL;

	if(IsEqualIID(riid, &IID_IUnknown))          /*IUnknown*/
	{ *ppvObj = This; 
	}
	else if(IsEqualIID(riid, &IID_IDataObject))  /*IDataObject*/
	{ *ppvObj = (IDataObject*)This;
	}   

	if(*ppvObj)
	{ IDataObject_AddRef((IDataObject*)*ppvObj);      
	  TRACE("-- Interface: (%p)->(%p)\n",ppvObj,*ppvObj);
	  return S_OK;
	}
	TRACE("-- Interface: E_NOINTERFACE\n");
	return E_NOINTERFACE;
}
/**************************************************************************
*  IDataObject_AddRef
*/
static ULONG WINAPI IDataObject_fnAddRef(LPDATAOBJECT iface)
{
	ICOM_THIS(IDataObjectImpl,iface);

	TRACE("(%p)->(count=%lu)\n",This, This->ref);

	shell32_ObjCount++;
	return ++(This->ref);
}
/**************************************************************************
*  IDataObject_Release
*/
static ULONG WINAPI IDataObject_fnRelease(LPDATAOBJECT iface)
{
	ICOM_THIS(IDataObjectImpl,iface);
	TRACE("(%p)->()\n",This);

	shell32_ObjCount--;

	if (!--(This->ref)) 
	{ TRACE(" destroying IDataObject(%p)\n",This);
	  IDLList_Destructor(This->lpill);
	  HeapFree(GetProcessHeap(),0,This);
	  return 0;
	}
	return This->ref;
}

/**************************************************************************
* IDataObject_fnGetData
*/
static HRESULT WINAPI IDataObject_fnGetData(LPDATAOBJECT iface, LPFORMATETC pformatetcIn, STGMEDIUM *pmedium)
{
	ICOM_THIS(IDataObjectImpl,iface);

	char	szTemp[256];
	UINT	cItems;
	DWORD	sizeCIDA, sizePidl, nOffset, nSize;
	LPCIDA	pcida;
	HGLOBAL	hmem;
	int	i;
	LPITEMIDLIST	pidl;
	
	GetClipboardFormatNameA (pformatetcIn->cfFormat, szTemp, 256);
	TRACE("(%p)->(%p %p format=%s)\n", This, pformatetcIn, pmedium, szTemp);

	/* test expected format */
	if (!(pformatetcIn->cfFormat == This->cfShellIDList))
	{
	  FIXME("-- clipformat not implemented\n");
	  return (E_INVALIDARG);
	}

	if (pformatetcIn->ptd==NULL 
		&& (pformatetcIn->dwAspect & DVASPECT_CONTENT) 
		&& pformatetcIn->lindex==-1 
		&& (pformatetcIn->tymed&TYMED_HGLOBAL))
	{
	  cItems = This->lpill->lpvtbl->fnGetCount(This->lpill);
	  if (cItems < 1) return(E_UNEXPECTED);
	
	  sizeCIDA = sizeof(CIDA) + sizeof (UINT)*(cItems);	/* without any pidl */
	  sizePidl = ILGetSize (This->pidl);			/* add root pidl */

	  nSize = sizeCIDA + sizePidl;
	  hmem = GlobalAlloc(GHND|GMEM_SHARE, nSize);		
	  if (!hmem) return(E_OUTOFMEMORY);
	  pcida = GlobalLock (hmem);

	  nOffset = sizeCIDA;				/* start after the CIDA */
	  pcida->cidl = cItems;

	  pcida->aoffset[0] = nOffset;			/* first element */
	  memcpy(((LPBYTE)pcida)+nOffset, This->pidl, sizePidl);
	  nOffset += sizePidl;
	  pdump(This->pidl);

	  for (i=0; i< cItems; i++)
	  {
	    pidl = This->lpill->lpvtbl->fnGetElement(This->lpill, i);
	    sizePidl = ILGetSize (pidl);
	    nSize += sizePidl;				/* size of the structure */
	    pdump(pidl);

	    GlobalUnlock(hmem);				/* grow memory */
	    hmem = GlobalReAlloc(hmem, nSize, GHND|GMEM_SHARE);
	    if (!hmem) return(E_OUTOFMEMORY);
	    pcida = GlobalLock (hmem);

	    pcida->aoffset[i+1] = nOffset;		/* copy element */
	    memcpy(((LPBYTE)pcida)+nOffset, pidl, sizePidl);
	    nOffset += sizePidl;
	  }

	  GlobalUnlock(hmem);

	  pmedium->tymed = TYMED_HGLOBAL;
	  pmedium->u.hGlobal = hmem;
	  pmedium->pUnkForRelease = NULL;

	  TRACE("(%p)->(cida at %p)\n", This, pcida);
	  return hmem;
	}

	FIXME("-- can't serve format\n");
	return (E_INVALIDARG);
}
static HRESULT WINAPI IDataObject_fnGetDataHere(LPDATAOBJECT iface, LPFORMATETC pformatetc, STGMEDIUM *pmedium)
{
	ICOM_THIS(IDataObjectImpl,iface);
	FIXME("(%p)->()\n", This);
	return E_NOTIMPL;
}
static HRESULT WINAPI IDataObject_fnQueryGetData(LPDATAOBJECT iface, LPFORMATETC pformatetc)
{
	ICOM_THIS(IDataObjectImpl,iface);
	UINT i;
	
	TRACE("(%p)->(fmt=0x%08x tym=0x%08lx)\n", This, pformatetc->cfFormat, pformatetc->tymed);
	
	if(!(DVASPECT_CONTENT & pformatetc->dwAspect))
	  return DV_E_DVASPECT;

	/* check our formats table what we have */
	for (i=0; i<MAX_FORMATS; i++)
	{
	  if ((This->pFormatEtc[i].cfFormat == pformatetc->cfFormat)
	   && (This->pFormatEtc[i].tymed == pformatetc->tymed))
	  {
	    return S_OK;
	  }
	}

	return DV_E_TYMED;
}
static HRESULT WINAPI IDataObject_fnGetCanonicalFormatEtc(LPDATAOBJECT iface, LPFORMATETC pformatectIn, LPFORMATETC pformatetcOut)
{
	ICOM_THIS(IDataObjectImpl,iface);
	FIXME("(%p)->()\n", This);
	return E_NOTIMPL;
}
static HRESULT WINAPI IDataObject_fnSetData(LPDATAOBJECT iface, LPFORMATETC pformatetc, STGMEDIUM *pmedium, BOOL fRelease)
{
	ICOM_THIS(IDataObjectImpl,iface);
	FIXME("(%p)->()\n", This);
	return E_NOTIMPL;
}
static HRESULT WINAPI IDataObject_fnEnumFormatEtc(LPDATAOBJECT iface, DWORD dwDirection, IEnumFORMATETC **ppenumFormatEtc)
{
	ICOM_THIS(IDataObjectImpl,iface);

	TRACE("(%p)->()\n", This);
	*ppenumFormatEtc=NULL;

	/* only get data */
	if (DATADIR_GET == dwDirection)
	{
	  *ppenumFormatEtc = IEnumFORMATETC_Constructor(MAX_FORMATS, This->pFormatEtc);
	  return (*ppenumFormatEtc) ? S_OK : E_FAIL;
	}
	
	return E_NOTIMPL;
}
static HRESULT WINAPI IDataObject_fnDAdvise(LPDATAOBJECT iface, FORMATETC *pformatetc, DWORD advf, IAdviseSink *pAdvSink, DWORD *pdwConnection)
{
	ICOM_THIS(IDataObjectImpl,iface);
	FIXME("(%p)->()\n", This);
	return E_NOTIMPL;
}
static HRESULT WINAPI IDataObject_fnDUnadvise(LPDATAOBJECT iface, DWORD dwConnection)
{
	ICOM_THIS(IDataObjectImpl,iface);
	FIXME("(%p)->()\n", This);
	return E_NOTIMPL;
}
static HRESULT WINAPI IDataObject_fnEnumDAdvise(LPDATAOBJECT iface, IEnumSTATDATA **ppenumAdvise)
{
	ICOM_THIS(IDataObjectImpl,iface);
	FIXME("(%p)->()\n", This);
	return E_NOTIMPL;
}

static struct ICOM_VTABLE(IDataObject) dtovt = 
{
	ICOM_MSVTABLE_COMPAT_DummyRTTIVALUE
	IDataObject_fnQueryInterface,
	IDataObject_fnAddRef,
	IDataObject_fnRelease,
	IDataObject_fnGetData,
	IDataObject_fnGetDataHere,
	IDataObject_fnQueryGetData,
	IDataObject_fnGetCanonicalFormatEtc,
	IDataObject_fnSetData,
	IDataObject_fnEnumFormatEtc,
	IDataObject_fnDAdvise,
	IDataObject_fnDUnadvise,
	IDataObject_fnEnumDAdvise
};